Sun, 27 Jul 2008 07:46:50 BST CiteULike: dcastro's simulation http://www.citeulike.org/user/dcastro/tag/simulation CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/3025779 <i>Antennas and Propagation Magazine, IEEE, Vol. 40, No. 4. (1998), pp. 95-103.</i><br /><br />The program presented in this paper is intended to provide a valuable aid for teaching antennas to electrical engineers, and to provide fast and accurate pre-designs for professionals. This paper covers the theory and numerical techniques used in SABOR. In summary, this program computes the radiated field of an aperture antenna (horn or reflector), using a common engine based on the Gauss-Legendre quadrature method for evaluating the radiation integrals. For horn, the aperture fields are the usual dominant modes of the feed waveguide, with a quadratic phase correction. For reflectors, the aperture fields are computed using geometrical optics ray tracing from the feed horn. Also, equivalent-reflector concepts are applied for dual-reflector antennas. The paper includes some examples to demonstrate the most important features of the program SABOR: description of the methods applied for a fast analysis of horn and reflector antennas MA Campo FJ Del Rey JL Besada L De Haro doi:10.1109/74.730541 Antennas and Propagation Magazine, IEEE, Vol. 40, No. 4. (1998), pp. 95-103. 2008-07-21T22:11:12-00:00 1998 Antennas and Propagation Magazine, IEEE 40 4 95 103 antenna simulation http://www.citeulike.org/user/dcastro/article/3025775 <i>Antennas and Propagation Magazine, IEEE, Vol. 40, No. 3. (1998), pp. 104-108.</i><br /><br />SABOR (software de analisis de bocinas y reflectores) is an antenna-analysis approach for the computation of horn- and reflector-antenna performance. The program covers and expands topics already developed with other software. The program can analyze almost any kind of horn (E and H pyramidal horns, circular horns, corrugated horns). The current configuration of SABOR can also analyze centered and offset parabolic reflectors, dual-offset Cassegrain and Gregorian reflectors, and centered Cassegrain systems. For feeding reflectors, the program allows use of the classical cos^q pattern and any of the horn mentioned above. Usage of real horns improves the accuracy of computed efficiencies and the simulation of the cross-polar radiation SABOR: a fast analysis tool for horn and reflector antennas JL Volakis doi:10.1109/74.706107 Antennas and Propagation Magazine, IEEE, Vol. 40, No. 3. (1998), pp. 104-108. 2008-07-21T22:10:01-00:00 1998 Antennas and Propagation Magazine, IEEE 40 3 104 108 antennas simulation http://www.citeulike.org/user/dcastro/article/3014905 <i>Frequency Control Symposium, 2007 Joint with the 21st European Frequency and Time Forum. IEEE International (2007), pp. 511-516.</i><br /><br />The characterisation and certification of Galileo Ground Receiver Chain (GRC) elements for the Galileo satellite-based navigation system is a critical programme activity, particularly for the In-Orbit Verification phase (IOV). Spirent has been contracted by the European Space Agency (ESA) via Thales Alenia Space to provide reference test equipment in the form of RF Constellation Simulators (RFCS) to support certification of the GRC and test user receiver elements. These RFCS are able to support all the Galileo frequencies and services, including open service, commercial service, safety-of-life service and public regulated service (PRS). This paper begins by presenting a brief technical description of the RCFS design and architecture and proceeds to describe the scope of and approach to the formal verification process. Where appropriate, further detail of some of the verification techniques used are presented including a statement of the requirement, the test equipment and procedures involved and a summary of the results obtained. Most specific PRS aspects are excluded from this paper due to their classified status. Initial conclusions are drawn and future work is described. Galileo RF Constellation Simulator Design Verification and Testing P Boulton R Wong A Read doi:10.1109/FREQ.2007.4319126 Frequency Control Symposium, 2007 Joint with the 21st European Frequency and Time Forum. IEEE International (2007), pp. 511-516. 2008-07-17T15:34:29-00:00 2007 Frequency Control Symposium, 2007 Joint with the 21st European Frequency and Time Forum. IEEE International 511 516 galileo gnss simulation http://www.citeulike.org/user/dcastro/article/1366339 <i>Wireless Personal Communications, Vol. 41, No. 4. (June 2007), pp. 487-505.</i> The Effect of Terminal Movement on the Performance of IEEE 802.11 g Wireless LAN Systems in Simulated Radio Channels Silvennoinen Aki Hall Michael Haggman Sven-Gustav doi:10.1007/s11277-006-9155-1 Wireless Personal Communications, Vol. 41, No. 4. (June 2007), pp. 487-505. 2007-06-05T21:33:41-00:00 2007 Wireless Personal Communications 0929-6212 41 4 487 505 Springer 80211 channel mobile radio simulation wlan http://www.citeulike.org/user/dcastro/article/2924552 <i>Acoustics, Speech, and Signal Processing, 2002. Proceedings. (ICASSP '02). IEEE International Conference on, Vol. 4 (2002), pp. IV-3756-IV-3759 vol.4.</i><br /><br />Broadband wireless services are typically considered usable in limited mobility conditions (fixed access or at pedestrian speeds). In this paper, we present a method for time and frequency synchronization of broadband OFDM for mobile ad hoc networking systems, where each node randomly and rapidly changes location. The proposed method is robust in Rayleigh fading and is computationally tractable for low-power digital signal processor (DSP) implementations. The synchronization method uses a pseudo-noise (PN) preamble sequence, provides low probability of false detection, low probability of missed detection, and exhibits a low peak-to-average power ratio (PAPR). We show that the power spectral density (PSD) of the PN-based preamble, after the digital up-converter shaping filter, fits into a spectral mask similar to that of the OFDM traffic signal's PSD. Efficient implementation is demonstrated using frequency-domain equivalent processing on a fixed-point Texas Instruments DSP and a floating-point Motorola G4 PowerPC with Altivec. Synchronization for broadband OFDM mobile ad hoc networking: simulation and implementation JE Kleider S Gifford doi:10.1109/ICASSP.2002.1004734 Acoustics, Speech, and Signal Processing, 2002. Proceedings. (ICASSP '02). IEEE International Conference on, Vol. 4 (2002), pp. IV-3756-IV-3759 vol.4. 2008-06-24T22:32:13-00:00 2002 Acoustics, Speech, and Signal Processing, 2002. Proceedings. (ICASSP '02). IEEE International Conference on 4 IV-3756 IV-3759 vol.4 ad-hoc broadband mobile ofdm simulation synchronization http://www.citeulike.org/user/dcastro/article/2902421 <i>Antennas and Propagation Magazine, IEEE, Vol. 40, No. 5. (1998), pp. 102-105.</i><br /><br />This paper compares the use of three programming languages, FORTRAN, C/C++, and Java, in a simple numerical computation of the product of two matrices. The goal is to show that, although similar in expressiveness, the performance of the three languages can be vastly different with current implementations. We analyze the causes of these differences, and we discuss how state-of-the-art compilation can be used to deliver excellent performance for all three languages A comparison of Java, C/C++, and FORTRAN for numerical computing JE Moreira SP Midkiff M Gupta doi:10.1109/74.736311 Antennas and Propagation Magazine, IEEE, Vol. 40, No. 5. (1998), pp. 102-105. 2008-06-17T13:01:12-00:00 1998 Antennas and Propagation Magazine, IEEE 40 5 102 105 computing simulation http://www.citeulike.org/user/dcastro/article/2883707 <i>Computer Engineering & Systems, 2007. ICCES '07. International Conference on (2007), pp. 274-279.</i><br /><br />WiMAX top level SIMULINK model with all system details has been implemented for simulation purpose. This paper has focused on channel estimation with different interpolation approaches for fixed/mobile OFDM system with parameters from WiMAX standards. The Doppler shift had a greater impact on the relative performancebetween the different channel estimators and interpolation approaches. One of the most interesting properties that were discovered is the big impact the interpolation method has over the estimating method in case of mobile case. The result from the simulation is that the low complexity LS method performs about the same for SNR as LMS which is more complex estimator, before Doppler shift but it has different behavior after that. Simulation of channel estimation and equalization for WiMAX PHY layer in simulink OA Alim N Elboghdadly MM Ashour AM Elaskary doi:10.1109/ICCES.2007.4447060 Computer Engineering & Systems, 2007. ICCES '07. International Conference on (2007), pp. 274-279. 2008-06-11T20:11:07-00:00 2007 Computer Engineering & Systems, 2007. ICCES '07. International Conference on 274 279 channel equalization estimation simulation simulink wimax http://www.citeulike.org/user/dcastro/article/2877927 <i>Selected Areas in Communications, IEEE Journal on, Vol. 10, No. 8. (1992), pp. 1209-1218.</i><br /><br />An analog model describing signal amplitude and phase variations on shadowed satellite mobile channels is proposed. A linear combination of log-normal, Rayleigh, and Rice models is used to describe signal variations over an area with constant environment attributes while an <e1>M</e1>-state Markov chain is applied to represent environment parameter variations. Channel parameters are evaluated from the experimental data and utilized to verify a simulation model. Results, presented in the form of signal waveforms, probability density functions, fade durations, and average bit and block error rates, show close agreement with measurements Channel modeling and simulation in satellite mobile communication systems B Vucetic J Du doi:10.1109/49.166746 Selected Areas in Communications, IEEE Journal on, Vol. 10, No. 8. (1992), pp. 1209-1218. 2008-06-09T19:22:04-00:00 1992 Selected Areas in Communications, IEEE Journal on 10 8 1209 1218 channel mobile model satellite simulation http://www.citeulike.org/user/dcastro/article/2877926 <i>Antennas and Propagation, IEEE Transactions on, Vol. 40, No. 4. (1992), pp. 375-382.</i><br /><br />Mobile satellite systems are subject to severe fading due to blockage of the line-of-sight (LOS) path by roadside vegetation. A thorough understanding of the fading effects is necessary for the design of a reliable land-mobile satellite system. Analytical and empirical models are presented for predicting fade statistics for vegetative shadowing of mobile satellite terminals. A software simulator for generating simulated fade data is also presented. A physical model relating physical path parameters to propagation model parameters is presented, and results using the model are shown Modeling and simulation of mobile satellite propagation RM Barts WL Stutzman doi:10.1109/8.138838 Antennas and Propagation, IEEE Transactions on, Vol. 40, No. 4. (1992), pp. 375-382. 2008-06-09T19:22:04-00:00 1992 Antennas and Propagation, IEEE Transactions on 40 4 375 382 mobile propagation satellite simulation http://www.citeulike.org/user/dcastro/article/2557979 <i>Communications Magazine, IEEE, Vol. 32, No. 7. (1994), pp. 42-53.</i><br /><br />Mobile communication systems present several design challenges that stem from the mobility of users throughout the system and the time-varying multipath channel and interference. To address these challenges, future wireless modems will rely on performance enhancing techniques such as adaptive antennas, DSP-based interference rejection techniques, and real-time signal processing for capacity improvement. The authors present an overview of key simulation issues for wireless communications systems. First, the burst error characteristics of the mobile channel require the selection of appropriate performance measures. Second, accurate simulations require realistic channel models that include the effects of attenuation, multipath propagation, noise, and interference. Third, link-level simulation of wireless systems requires attention to details of system implementation including the effects of nonlinearities. Finally, efficient simulation of CDMA systems may require a combination of analytic and simulation techniques Simulation issues for future wireless modems BD Woerner JH Reed TS Rappaport doi:10.1109/35.295944 Communications Magazine, IEEE, Vol. 32, No. 7. (1994), pp. 42-53. 2008-03-19T10:59:38-00:00 1994 Communications Magazine, IEEE 32 7 42 53 simulation http://www.citeulike.org/user/dcastro/article/2813988 <i></i> SIMULACIÓN DE PROCEDIMIENTOS DE MEDIDA DE DIAGRAMAS DE ANTENAS INTELIGENTES Esther Arias Leandro 2008-05-19T19:32:45-00:00 antenna array simulation smart http://www.citeulike.org/user/dcastro/article/2813939 <i></i> Estimacion Eficiente de la Probabilidad de Error para el Diseño de Redes WLAN Beatriz Rodríguez Matilde Ana Armada 2008-05-19T19:07:42-00:00 ber simulation wlan http://www.citeulike.org/user/dcastro/article/2809064 <i>Electrical and Computer Engineering, 1997. IEEE 1997 Canadian Conference on, Vol. 1 (1997), pp. 347-350 vol.1.</i><br /><br />We present a new computationally efficient time-varying multi-path vectorial channel simulator that can be used to evaluate the performance of antenna array wireless receivers challenged by fast fading. The development of the simulator is based on the emulation of the spatio-temporal correlation properties of the vector channel. The channel is modeled as a multi-channel FIR system with time-varying coefficients which are obtained via the application of a space-time correlation shaping transformation on some, independent random sequences. The various parts of the new simulator are described and chained simulation realizations are presented and commented on On the simulation of multi-path vectorial channels for the evaluation of antenna array systems A Stephenn B Champagne doi:10.1109/CCECE.1997.614860 Electrical and Computer Engineering, 1997. IEEE 1997 Canadian Conference on, Vol. 1 (1997), pp. 347-350 vol.1. 2008-05-18T14:04:37-00:00 1997 Electrical and Computer Engineering, 1997. IEEE 1997 Canadian Conference on 1 347 350 vol.1 antenna array channel multipath simulation http://www.citeulike.org/user/dcastro/article/2808912 <i>ION GNSS 2003 (2003)</i> Simulation & verification of new architectures for Galileo Navigation Signal Demodulation S Fischer S Berberich J Heim PA Krauss ION GNSS 2003 (2003) 2008-05-18T12:17:05-00:00 2003 ION GNSS 2003 demodulation galileo signal simulation http://www.citeulike.org/user/dcastro/article/2806810 <i>Communications, IEEE Transactions on [legacy, pre - 1988], Vol. 28, No. 11. (1980), pp. 1916-1924.</i><br /><br />Digital communication systems are frequently operated over nonlinear channels with memory. The analysis of the performance of these systems is difficult and no complete analytical treatment of the problem has been obtained before. Several recent efforts have been directed toward the computation of error probabilities via Monte-Carlo simulation using a complete system model. These simulations require excessively large sample sizes and are not practical for estimating very low values of error probabilities. This paper presents a modified Monte-Carlo simulation technique for estimating error probabilities in digital communication systems operating over nonlinear channels. An importance-sampling technique is used to modify the probability density function of the noise process in a way to make simulation possible. Theoretical results as well as realistic examples are presented, showing that the number of samples needed for simulation is reduced considerably. A Modified Monte-Carlo Simulation Technique for the Evaluation of Error Rate in Digital Communication Systems K Shanmugam P Balaban Communications, IEEE Transactions on [legacy, pre - 1988], Vol. 28, No. 11. (1980), pp. 1916-1924. 2008-05-17T10:55:58-00:00 1980 Communications, IEEE Transactions on [legacy, pre - 1988] 28 11 1916 1924 ber digital monte-carlo simulation http://www.citeulike.org/user/dcastro/article/1064993 <i>Selected Areas in Communications, IEEE Journal on, Vol. 2, No. 1. (1984), pp. 153-170.</i><br /><br />Computer simulation is often used to estimate the bit error rate (BER) performance of digital communication systems. There are a number of distinct techniques in the simulation context that can be used to construct this estimate. A tutorial exposition of such techniques is provided, with particular reference to five specific methods which can be implemented in a simulation. These methods range from the traditional Monte Carlo trials to assumption of definite forms for the noise statistics. An attempt is made to show how these methods are related, and the specific assumptions that are invoked in order to apply them. Techniques for Estimating the Bit Error Rate in the Simulation of Digital Communication Systems M Jeruchim Selected Areas in Communications, IEEE Journal on, Vol. 2, No. 1. (1984), pp. 153-170. 2007-01-24T11:15:24-00:00 1984 Selected Areas in Communications, IEEE Journal on 2 1 153 170 ber digital simulation technique http://www.citeulike.org/user/dcastro/article/2801482 <i>Millimeter Waves, 1997 Topical Symposium on (1997), pp. 137-140.</i><br /><br />This paper presents FDTD simulation and measurement results for a microstrip-fed Yagi-Uda slot array antenna used for surface wave excitation of a dielectric slab. Parameters investigated are input return loss, surface wave field profiles, front-to-back ratio and mutual coupling. The FDTD simulation not only confirms the design philosophy of our planar dielectric quasi-optical (PDQ) power combiner, but also provides a powerful CAD tool for its practical design and optimization at millimeter wavelengths Surface wave excitation of a dielectric slab by a Yagi-Uda slot array antenna-FDTD simulation and measurement Yongxi Qian AR Perkons T Itoh doi:10.1109/TSMW.1997.702490 Millimeter Waves, 1997 Topical Symposium on (1997), pp. 137-140. 2008-05-15T12:21:01-00:00 1997 Millimeter Waves, 1997 Topical Symposium on 137 140 array fdtd measurement simulation surface wave http://www.citeulike.org/user/dcastro/article/2801451 <i>Microwave Symposium Digest, 1994., IEEE MTT-S International (1994), pp. 883-886 vol.2.</i><br /><br />The FDTD algorithm is used to simulate a two element active antenna which is capable of three different coupled oscillation modes. This analysis correctly predicts which modes will be stable in the steady state under different loading conditions. The predicted oscillation modes, oscillation frequencies and radiation patterns are compared with experimental data Electromagnetic simulation of mode control of a two element active antenna B Toland J Lin B Houshmand T Itoh doi:10.1109/MWSYM.1994.335216 Microwave Symposium Digest, 1994., IEEE MTT-S International (1994), pp. 883-886 vol.2. 2008-05-15T12:11:08-00:00 1994 Microwave Symposium Digest, 1994., IEEE MTT-S International 883 886 vol.2 active antenna array simulation http://www.citeulike.org/user/dcastro/article/2782982 <i>Aerospace and Electronic Systems, IEEE Transactions on, Vol. 43, No. 4. (2007), pp. 1617-1624.</i><br /><br />This paper presents results concerning the use of IEEE 802.11 a and b wireless local area network (WLAN) standards for proximity wireless networks on the Martian surface. The RF environment on the Martian surface is modeled using high-resolution digital elevation maps (DEMs) of Gusev Crater and Meridiani Planum (Hematite) as sample sites. The resulting propagation path loss models are then used in a physical layer (PHY) simulation. Our results show that Martian terrain as represented by the sites studied, can create multipath conditions which in turn affect 802.11 a and b PHY performance. However, with a few tens of milliwatts of radiated power and antenna heights within 1-2 m, orthogonal frequency division multiplexing (OFDM)-based 802.11 a can have very good PHY performance in terms of bit error rate (BER) and packet error rate (PER) for distances up to a few hundred meters; 802.11 b, which is based on direct-sequence spread spectrum (DSSS), is found to be much more adversely affected in the multipath environment. The DEM-based simulation methodology presented here may be more useful to mission planners than generic statistical models. Terrain-based simulation of IEEE 802.11a and b physical layers on the martian surface A Daga GR Lovelace DK Borah PL De Leon doi:10.1109/TAES.2007.4441762 Aerospace and Electronic Systems, IEEE Transactions on, Vol. 43, No. 4. (2007), pp. 1617-1624. 2008-05-10T14:56:10-00:00 2007 Aerospace and Electronic Systems, IEEE Transactions on 43 4 1617 1624 80211 martian physical simulation wlan http://www.citeulike.org/user/dcastro/article/2776272 <i>Electron Devices Meeting, 1997. IEDM '97. Technical Digest., International (1997), pp. 301-304.</i><br /><br />The rapid growth of wireless systems at radio frequencies (RF) is driving the need for improved analog circuit and device analysis at gigaHertz frequencies. This includes: low noise front ends, linear amplifiers, mixers, and power amplifiers. Moreover, the parasitic effects of capacitance and inductance, both on- and off-chip, require careful extraction and characterization in support of predictive modeling. While time-domain techniques work well for digital systems, often the spectral and dynamic range requirements for communications systems necessitate accurate analysis of harmonic content with frequency differences of a thousandfold or more. This paper demonstrates the applicability and unique strengths of device-level harmonic balance (HB) in the simulation and physical modeling of RF circuits Device simulation for RF applications RW Dutton B Troyanovsky Z Yu T Arnborg F Rotella G Ma J Sato-Iwanaga doi:10.1109/IEDM.1997.650386 Electron Devices Meeting, 1997. IEDM '97. Technical Digest., International (1997), pp. 301-304. 2008-05-09T16:40:13-00:00 1997 Electron Devices Meeting, 1997. IEDM '97. Technical Digest., International 301 304 rf simulation http://www.citeulike.org/user/dcastro/article/2776271 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 6. (2000), pp. 991-999.</i><br /><br />This paper describes how device simulation may be used for the modeling, analysis, and design of radio-frequency (RF) laterally diffused metal-oxide-semiconductor (LDMOS) transistors. Improvements to device analysis needed to meet the requirements of RF devices are discussed. Key modeling regions of the LDMOS device are explored and important physical effects are characterized. The LDMOS model is compared to dc and small-signal ac measurements for calibration purposes. Using the calibrated model, large-signal accuracy is verified using harmonic distortion simulation, and intermodulation analysis. Predictive analysis and a study of the structure's parasitic components are also presented. Load-pull simulation is used to analyze matching network effects to determine the best choices for device impedance matching Modeling, analysis, and design of RF LDMOS devices using harmonic-balance device simulation FM Rotella G Ma Z Yu RW Dutton doi:10.1109/22.904736 Microwave Theory and Techniques, IEEE Transactions on, Vol. 48, No. 6. (2000), pp. 991-999. 2008-05-09T16:40:12-00:00 2000 Microwave Theory and Techniques, IEEE Transactions on 48 6 991 999 analysis design model rf simulation http://www.citeulike.org/user/dcastro/article/2768650 <i>Microwave Conference, 2003. 33rd European, Vol. 1 (2003), pp. 211-213 Vol.1.</i><br /><br />The paper presents a strategy for the design of waveguide filters and diplexers, with the help of commercially available 3D full-wave simulators. The problem in hand is subdivided into an appropriate number of well defined steps, starting from the choice of the circuit prototype to the final full-wave EM simulation. The computational effort is adequate and, often, the overall design time for the complete design is reduced to less than 1 day. One example, concerning a WR12 filter, employing non-standard coupling elements is discussed. An effective strategy for the use of commercial full-wave simulators in the design of waveguide filters and diplexers A Morini N Iliev G Venanzoni G Cereda B Gabrielli Microwave Conference, 2003. 33rd European, Vol. 1 (2003), pp. 211-213 Vol.1. 2008-05-08T06:36:17-00:00 2003 Microwave Conference, 2003. 33rd European 1 211 213 Vol.1 design diplexer filter simulation http://www.citeulike.org/user/dcastro/article/2762238 <i>Microwave Conference Proceedings, 1997. APMC '97, 1997 Asia-Pacific (1997), pp. 717-720 vol.2.</i><br /><br />Popular GaAs FET large-signal drain conduction current models depend only on instantaneous terminal voltages, and ignore important phenomena that result in low frequency dispersion. To be valid at microwave frequencies, both the DC and time-varying components of current must be accurately modelled. This paper proposes a GaAs FET drain current model, which includes rate-dependent body and thermal effects, and therefore has the capability to accurately predict both the DC and time-varying components of drain current. Further, this model is particularly suited to harmonic balance simulation of microwave circuits Nonlinear-dispersive GaAs FET drain-current model for harmonic balance simulation KW Eccleston doi:10.1109/APMC.1997.654642 Microwave Conference Proceedings, 1997. APMC '97, 1997 Asia-Pacific (1997), pp. 717-720 vol.2. 2008-05-06T18:33:12-00:00 1997 Microwave Conference Proceedings, 1997. APMC '97, 1997 Asia-Pacific 717 720 vol.2 fet nonlinear simulation http://www.citeulike.org/user/dcastro/article/2762205 <i>Electronics Letters, Vol. 33, No. 25. (1997), pp. 2091-2092.</i><br /><br />The full wave design of an active integrated antenna using the extended FDTD method is presented. An active circulator using three gain blocks and a short circuited quarter wavelength patch are combined to form a transceiver. The effects of parasitic coupling are identified, and the isolation between transmit-receive is predicted FDTD simulation of active integrated antenna C Kalialakis MJ Cryan PS Hall P Gardner Electronics Letters, Vol. 33, No. 25. (1997), pp. 2091-2092. 2008-05-06T18:26:26-00:00 1997 Electronics Letters 33 25 2091 2092 active antenna fdtd integrated simulation http://www.citeulike.org/user/dcastro/article/2762204 <i>Lasers and Electro-Optics Society, 2002. LEOS 2002. The 15th Annual Meeting of the IEEE, Vol. 2 (2002), pp. 669-670 vol.2.</i><br /><br />The FDTD method is used to design a InP photonic crystal (PC) waveguide filter operating at 1534 nm. The filter uses strong mode coupling effects which result in a small device area of 8 /spl mu/m /spl times/ 10 /spl mu/m. Design and simulation of a photonic crystal waveguide filter using the FDTD method MJ Cryan R Varrazza M Cowin M Hill IJ Craddock S Yu CJ Railton J Rorison Lasers and Electro-Optics Society, 2002. LEOS 2002. The 15th Annual Meeting of the IEEE, Vol. 2 (2002), pp. 669-670 vol.2. 2008-05-06T18:26:24-00:00 2002 Lasers and Electro-Optics Society, 2002. LEOS 2002. The 15th Annual Meeting of the IEEE 2 669 670 vol.2 design fdtd filter simulation http://www.citeulike.org/user/dcastro/article/2687654 <i>Mobile WiMAX Symposium, 2007. IEEE (2007), pp. 104-107.</i><br /><br />Mobile WiMAX, which is standardized in the IEEE 802.16e-2005/802.16d-2004, is an broadband wireless access technology that enables convergence of mobile and fixed broadband networks through scalable orthogonal frequency-division multiple access (OFDMA), adaptive-antenna systems, and multiple-input multiple-output (MIMO) techniques. This paper presents the development and testing of a mobile WiMAX physical-layer testbed, which is constructed using National Instruments RF vector signal generator and RF vector signal analyzer. Implementation issues, including frame synchronization, phase correction, and power normalization, will be discussed. Practical performance measurements in terms of EVM (error vector magnitude) and spectral regrowth after HPA (high power amplifier) will be evaluated Development and performance evaluation of mobile WiMAX testbed Su Hu Gang Wu Yong Guan Choi Law Yanxin Yan Shaoqian Li doi:10.1109/WIMAX.2007.348688 Mobile WiMAX Symposium, 2007. IEEE (2007), pp. 104-107. 2008-04-18T11:09:22-00:00 2007 Mobile WiMAX Symposium, 2007. IEEE 104 107 implementation simulation wimax http://www.citeulike.org/user/dcastro/article/2674445 <i>Internet, 2007. ICI 2007. 3rd IEEE/IFIP International Conference in Central Asia on (2007), pp. 1-5.</i><br /><br />Nowadays, WiMAX has become one of the candidate networks in order to achieve high speed internet via wireles access systems .In this paper, the broadband wireless access system provided by IEEE802.16 and its modification for mobile customers IEEE802.16e will be addressed .Exclusively the downlink data transmission will be considered .the system performance will be tested in different operating environment. Rayleigh fading channel, channel estimation and equalization are considered also partial and full usage of subcarriers will be investigated with the support of cyclic prefix implementation. In addition the proposed simulation model has been tested using a Stanford channel model. Simulation and assessment of WiMAX network performance in different environments M Shafik El Gamal Selim doi:10.1109/CANET.2007.4401681 Internet, 2007. ICI 2007. 3rd IEEE/IFIP International Conference in Central Asia on (2007), pp. 1-5. 2008-04-15T17:45:30-00:00 2007 Internet, 2007. ICI 2007. 3rd IEEE/IFIP International Conference in Central Asia on 1 5 environment performance simulation wimax http://www.citeulike.org/user/dcastro/article/2674417 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 55, No. 4. (2007), pp. 729-735.</i><br /><br />This paper describes how circuit and system models are derived for antennas from measurement of the input reflection coefficient. Circuit models are used to optimize the antenna performance and to calculate the radiated power and the transfer function of the antenna. System models are then derived for transmitting and receiving antennas. The most important contribution of this study is to show how microwave structures can be integrated into the simulation of digital communication systems. This enables system designers to predict the effect of the microwave subsystem on the digital signals and calculate the resulting bit error rate System and Circuit Models for Microwave Antennas MI Sobhy B Sanz-Izquierdo JC Batchelor doi:10.1109/TMTT.2007.893675 Microwave Theory and Techniques, IEEE Transactions on, Vol. 55, No. 4. (2007), pp. 729-735. 2008-04-15T17:39:59-00:00 2007 Microwave Theory and Techniques, IEEE Transactions on 55 4 729 735 analysis antenna circuit microwave model simulation http://www.citeulike.org/user/dcastro/article/2648155 <i>Microwave Theory and Techniques, IEEE Transactions on, Vol. 37, No. 12. (1989), pp. 1949-1957.</i><br /><br />The authors present a detailed full-wave analysis of a coplanar waveguide (CPW) and a slotline by the time-domain finite-difference (TD-FD) method. The transient waveforms propagating along the coplanar waveguide and slotline, which are excited by retarded Gaussian pulses, are found in the time domain. After the time-domain field distributions are obtained, frequency-domain parameters such as the effective dielectric constant and the complex characteristic impedance are calculated using Fourier transformations. The results agree well with available theoretical and experimental data over a wide frequency range. The validity of the quasi-TEM assumptions for CPW and slotline analyses is also checked by evaluating the ratios of the longitudinal and transverse field components directly Full-wave analysis of coplanar waveguide and slotline using the time-domain finite-difference method GC Liang YW Liu KK Mei doi:10.1109/22.44107 Microwave Theory and Techniques, IEEE Transactions on, Vol. 37, No. 12. (1989), pp. 1949-1957. 2008-04-10T06:45:10-00:00 1989 Microwave Theory and Techniques, IEEE Transactions on 37 12 1949 1957 analysis coplanar simulation http://www.citeulike.org/user/dcastro/article/2648108 <i>Vehicular Technology Conference, 1988 IEEE 38th (1988), pp. 530-536.</i><br /><br />A simulation package has been developed for predicting the response of a cellular mobile radio channel to the transmission of narrow pulses. Four types of urban areas ranging from dense urban to suburban and three RF frequencies in the 0.5 to 3 GHz range are considered. These areas are geometrically modeled by a cellular pattern of hexagons making the model compatible with existing digital cellular mobile communication plans. The simulation model is wideband in nature, but it can also be used to predict the performance of narrowband systems Simulation of digital transmission in cellular mobile radio environment H Hashemi doi:10.1109/VETEC.1988.195413 Vehicular Technology Conference, 1988 IEEE 38th (1988), pp. 530-536. 2008-04-10T06:24:59-00:00 1988 Vehicular Technology Conference, 1988 IEEE 38th 530 536 digital environment mobile propagation radio simulation transmission http://www.citeulike.org/user/dcastro/article/2648107 <i>Broadcasting, IEEE Transactions on, Vol. 38, No. 4. (1992), pp. 256-262.</i><br /><br />An approach to the simulation of many of the channel impairments attributed to multipath fading and ghosting of a television signal is discussed. The use of the Hewlett Packard 11759D Dynamic Ghosting Simulator, which is capable of generating fading models ranging from static transmission conditions to dynamic cases of airplane flutter, tower sway, and reception by a mobile receiver in the simulation is described. All of these conditions can be used to subject future receivers, equalizers, and ghost cancellation circuitries to field-testing within the laboratory environment Simulation of multipath fading/ghosting for analog and digital television transmission in broadcast channels ML Bucher doi:10.1109/11.184729 Broadcasting, IEEE Transactions on, Vol. 38, No. 4. (1992), pp. 256-262. 2008-04-10T06:24:23-00:00 1992 Broadcasting, IEEE Transactions on 38 4 256 262 broadcast channel digital fading multipath propagation simulation http://www.citeulike.org/user/dcastro/article/2648101 <i>Selected Areas in Communications, IEEE Journal on, Vol. 5, No. 2. (1987), pp. 286-298.</i><br /><br />To accurately predict the performance of broadcast teletext systems, one must know the characteristics of typical over-the-air broadcast television channels. Consequently, ensembles of typical complex impulse responses of broadcast teletext channels in the VHF and UHF frequency ranges are required for computer performance simulations. To circumvent the lack of comprehensive measured channel data, a theoretical multipath propagation model for suburban and urban environments was developed to gain insight into the nature of typical television multipath channels. In this model, both the direct and scatter paths consist of a line-of-sight and ground-reflected component. The basis of the propagation model is an expression for the ratio of the scattered path to direct path field strength caused by vertically oriented dielectric slabs of specified thickness, height, and width. The reflector location, orientation, width, height, and thickness are randomized for each Monte Carlo simulation cycle. A scatter table of relative amplitude versus multipath delay is maintained for subsequent analysis and formation of typical multipath channel impulse responses. A perceived desired-to-undesired ratio (PDUR), which is essentially a signal-to-clutter ratio, is computed to eliminate channels of unacceptable video quality, as these would be of no interest to the teletext application. A modification to account for near-field scattering is described. Finally, mobile channel applications are discussed. A Multipath RF Propagation Model for Computer Simulation of Complex Impulse Responses of Broadcast Teletext Channels M Sablatash R Tiedemann K Moreland Selected Areas in Communications, IEEE Journal on, Vol. 5, No. 2. (1987), pp. 286-298. 2008-04-10T06:22:13-00:00 1987 Selected Areas in Communications, IEEE Journal on 5 2 286 298 channel model multipath propagation rf simulation http://www.citeulike.org/user/dcastro/article/2644035 <i>Global Telecommunications Conference, 1994. GLOBECOM '94. 'Communications: The Global Bridge'., IEEE, Vol. 3 (1994), pp. 1446-1450 vol.3.</i><br /><br />This paper addresses the simulation of multipath propagation on indoor radio channels. In particular, we study extremely high frequencies (60 GHz), where the common WSSUS model suffers from spatial limitations. We introduce a new approach to channel modeling. A statistical channel model is derived from a deterministic ray tracing description of the multipath situation by a tolerance analysis. Further, we show that such a model can be used for channel simulation by extending the Monte-Carlo method, which has been introduced for the simulation of WSSUS channels. An example of a 60 GHz indoor channel simulation is included Monte-Carlo multipath simulation of ray tracing channel models A Muller doi:10.1109/GLOCOM.1994.513016 Global Telecommunications Conference, 1994. GLOBECOM '94. 'Communications: The Global Bridge'., IEEE, Vol. 3 (1994), pp. 1446-1450 vol.3. 2008-04-09T09:03:43-00:00 1994 Global Telecommunications Conference, 1994. GLOBECOM '94. 'Communications: The Global Bridge'., IEEE 3 1446 1450 vol.3 channel model monte-carlo multipath ray simulation http://www.citeulike.org/user/dcastro/article/2641596 <i>Global Telecommunications Conference, 1991. GLOBECOM '91. 'Countdown to the New Millennium. Featuring a Mini-Theme on: Personal Communications Services (1991), pp. 1940-1946 vol.3.</i><br /><br />A simulation package for predicting the impulse response of the digital mobile radio propagation channel has been modified to take into account reflection and scattering of the transmitted signals by distant objects such as hills, mountains, and city skylines. For each distant reflector the round trip path loss is calculated using a model derived from the available information in the literature. Impulse response profiles with excess delays of up to 200 μs were then generated by repeatedly calling the original simulation package, scaling the resulting subprofiles properly, and combining them by vector addition of all the multipath components. The final model indicates that retarded echoes with magnitudes comparable to the line-of-sight path are possible under favorable propagation conditions from base to mobile through the reflected path, and unfavorable propagation conditions through the direct path Simulation of the urban radio propagation channel in the presence of distant reflectors H Hashemi doi:10.1109/GLOCOM.1991.188699 Global Telecommunications Conference, 1991. GLOBECOM '91. 'Countdown to the New Millennium. Featuring a Mini-Theme on: Personal Communications Services (1991), pp. 1940-1946 vol.3. 2008-04-08T13:26:36-00:00 1991 Global Telecommunications Conference, 1991. GLOBECOM '91. 'Countdown to the New Millennium. Featuring a Mini-Theme on: Personal Communications Services 1940 1946 vol.3 channel multipath propagation radio simulation urban http://www.citeulike.org/user/dcastro/article/2622846 <i>Communications Letters, IEEE, Vol. 11, No. 8. (2007), pp. 644-646.</i><br /><br />We present a novel, simple and tight approximation for the Gaussian Q-function and its integer powers. Compared to other known closed-form approximations, an accuracy improvement is achieved over the whole range of positive arguments. The results can be efficiently applied in the evaluation of the symbol error probability (SEP) of digital modulations in the presence of additive white Gaussian noise (AWGN) and the average SEP (ASEP) over fading channels. As an example we evaluate in closed-form the ASEP of differentially encoded QPSK in Nakagami-m fading. An Improved Approximation for the Gaussian Q-Function GK Karagiannidis AS Lioumpas doi:10.1109/LCOMM.2007.070470 Communications Letters, IEEE, Vol. 11, No. 8. (2007), pp. 644-646. 2008-04-02T09:58:54-00:00 2007 Communications Letters, IEEE 11 8 644 646 communication error simulation http://www.citeulike.org/user/dcastro/article/2622453 <i>Communications, 1990. ICC 90, Including Supercomm Technical Sessions. SUPERCOMM/ICC '90. Conference Record., IEEE International Conference on (1990), pp. 631-635 vol.2.</i><br /><br />The use of nonlinear biasing techniques in importance sampling (IS) simulations is discussed. For tail probability estimation, two new nonlinear IS (NLIS) approaches are presented: shift of absolute values (SAV) and sample elimination (SE). In the case of linear systems with Gaussian input, the SAV method is shown to be uniformly more efficient than the linear techniques and very robust with respect to suboptimal parameterization. With respect to suboptimal choice of its parameter, the efficiency of the SE method is more sensitive than that of all other IS techniques discussed. Both NLIS methods are found to be easily implementable alternatives to the standard linear IS(LIS) techniques. The estimation of very-low-interval probabilities is considered as a new field for the application of IS techniques. The author presents both an LIS and an NLIS approach for this problem and provides performance analyses. A uniform bound on the required sample size is obtained for both techniques, thus emphasizing their high efficiency. Both methods are shown to be very robust with respect to suboptimal parameterization Nonlinear importance sampling techniques for efficient simulation of communication systems HJ Schlebusch doi:10.1109/ICC.1990.117155 Communications, 1990. ICC 90, Including Supercomm Technical Sessions. SUPERCOMM/ICC '90. Conference Record., IEEE International Conference on (1990), pp. 631-635 vol.2. 2008-04-02T06:41:56-00:00 1990 Communications, 1990. ICC 90, Including Supercomm Technical Sessions. SUPERCOMM/ICC '90. Conference Record., IEEE International Conference on 631 635 vol.2 efficiency importance nonlinear sampling simulation technique http://www.citeulike.org/user/dcastro/article/2619039 <i>Communications Magazine, IEEE, Vol. 32, No. 7. (1994), pp. 26-35.</i><br /><br />When both a complex system and a complex channel model are encountered, the result is typically a design or analysis problem that cannot be solved using traditional (pencil and paper) mathematical analysis. Computer-aided techniques, which usually involve some level of numerical simulation, can be a very valuable tool in these situations. The purpose of this article is to provide a tutorial review of some of the basic techniques of communication system simulation. The authors consider the basic techniques used to represent signals, generate signals, and model linear systems, nonlinear systems, and time-varying systems within a simulation. They consider the important problem of using a simulation to estimate the performance of a communication system Simulation of communication systems WH Tranter KL Kosbar doi:10.1109/35.295942 Communications Magazine, IEEE, Vol. 32, No. 7. (1994), pp. 26-35. 2008-04-01T09:23:15-00:00 1994 Communications Magazine, IEEE 32 7 26 35 communication simulation system http://www.citeulike.org/user/dcastro/article/2575374 <i>Electrical and Computer Engineering, 2002. IEEE CCECE 2002. Canadian Conference on, Vol. 1 (2002), pp. 342-346 vol.1.</i><br /><br />This work demonstrates the combination of NEC2, for electromagnetic computation, with Matlab, for composing input files and graphical display of the results. It presents Matlab-NEC2 automation as applied to adaptive array antenna synthesis and design. NEC2 (numerical electromagnetics code 2) is a popular program, with available source code, for numerical electromagnetic computations based on the moment method. NEC2 input is in the form of a text file with the data in 80-column format. The output is written to an ASCII text file, with headers followed by tables of values. Matlab is a very powerful matrix and math software package, with advanced file I/O and graphical display capabilities. Because the input file to NEC2 adheres to strict rules, the numerical data can be prepared in Matlab and then concatenated with the appropriate strings and written to a text file. Matlab can call the NEC2 executable from within one of its scripts (called m-files), and then read in the resulting NEC2 output file for further analysis. In essence, NEC2 becomes a solver driven by Matlab. Given an optimization strategy, Matlab can iterate the above-mentioned process, until convergence or another criterion is met. Automating NEC2 with Matlab/sup /spl reg// for antenna analysis and design J Dietrich A Sebak doi:10.1109/CCECE.2002.1015246 Electrical and Computer Engineering, 2002. IEEE CCECE 2002. Canadian Conference on, Vol. 1 (2002), pp. 342-346 vol.1. 2008-03-23T20:22:26-00:00 2002 Electrical and Computer Engineering, 2002. IEEE CCECE 2002. Canadian Conference on 1 342 346 vol.1 analysis antenna design matlab simulation http://www.citeulike.org/user/dcastro/article/2431233 <i>Geoscience and Remote Sensing Symposium, 2003. IGARSS '03. Proceedings. 2003 IEEE International, Vol. 1 (2003), pp. 13-15 vol.1.</i><br /><br />The SMOS Earth Explorer Opportunity Mission was selected in May 1999 by the European Space Agency to provide global and frequent soil moisture and sea salinity maps. SMOS' single payload is MIRAS (Microwave Imaging Radiometer by Aperture Synthesis), an L-band two-dimensional aperture synthesis interferometric radiometer with multi-angular observation capabilities. Two-dimensional brightness temperature images are obtained by processing the cross-relations measured by pairs of signals collected by each of the 72 elements of a Y-shaped array. Due to the significant differences with respect to its radio-astronomy predecessors (larger number of receiving channels and wider field-of-view) during the past decade a detailed instrument error model was studied, as well as new calibration and image reconstruction techniques. The analysis of the overall performance of this complex instrument required the implementation of an end-to-end performance simulator (Camps, 1996; Corbella et al., 2003; Camps et al., 2002), which has been and it is currently being used in the technical design trade-off of the instrument. This software tool was also designed to help both the engineers working in the instrument and mission design and the scientific community in the implementation of new multi-angular algorithms for soil moisture and ocean salinity retrieval. This paper briefly describes the main functionalities and capabilities of the present and next versions of the SMOS End-to-end Performance Simulator (SEPS) and presents examples of application to the soil moisture (SM) and sea surface salinity (SSS) retrieval problems. The SMOS end-to-end performance simulator: description and scientific applications A Camps I Corbella M Vall-Llossera N Duffo F Marcos F Martinez-Fadrique M Greiner Geoscience and Remote Sensing Symposium, 2003. IGARSS '03. Proceedings. 2003 IEEE International, Vol. 1 (2003), pp. 13-15 vol.1. 2008-02-26T20:11:14-00:00 2003 Geoscience and Remote Sensing Symposium, 2003. IGARSS '03. Proceedings. 2003 IEEE International 1 13 15 vol.1 simulation smos http://www.citeulike.org/user/dcastro/article/2425860 <i>Vehicular Technology, IEEE Transactions on, Vol. 49, No. 1. (2000), pp. 254-275.</i><br /><br />A data-aided frequency and symbol synchronization scheme for M-QAM OFDM signals is suggested. At first, the phase discriminator (PD) and frequency discriminator (FD) for, respectively, the symbol and frequency synchronization loop are described. Second, the transfer function and design parameters of the loop filters are provided. The acquisition and tracking performance of the synchronization system are evaluated using simulation for a 4-PSK signal constellation. The cases of additive white Gaussian noise (AWGN) and frequency and time selective multipath Rayleigh channels are separately tested A frequency and symbol synchronization system for OFDM signals: architecture and simulation results G Santella doi:10.1109/25.820719 Vehicular Technology, IEEE Transactions on, Vol. 49, No. 1. (2000), pp. 254-275. 2008-02-25T15:38:24-00:00 2000 Vehicular Technology, IEEE Transactions on 49 1 254 275 architecture frequency ofdm simulation symbol synchronization system http://www.citeulike.org/user/dcastro/article/2394585 <i>Selected Areas in Communications, IEEE Journal on, Vol. 11, No. 3. (1993), pp. 328-339.</i><br /><br />When simulating multicarrier digital communication systems operating over nonlinear channels, the required high sampling rate contributes significantly to long execution times. A new method that reduces the sampling rate of simulations of such systems is developed. The partial rate of products (ParSOP) method reduces the sampling rate by generating only the intermodulation products that lie in a frequency band of interest. The ParSOP method requires that the bandpass nonlinearity be represented by memoryless operations on the complex envelope of the signal and that the subcarriers constituting the frequency-division multiplexed signal are sufficiently separated to prevent significant adjacent channel interference. Simulation results for such systems show that an order of magnitude reduction in the sampling rate is possible while producing only minimal error in the bit error rate estimate Efficient simulation of multicarrier digital communication systems in nonlinear channel environments KW Schneider WH Tranter doi:10.1109/49.219548 Selected Areas in Communications, IEEE Journal on, Vol. 11, No. 3. (1993), pp. 328-339. 2008-02-18T14:25:33-00:00 1993 Selected Areas in Communications, IEEE Journal on 11 3 328 339 channel digital multicarrier nonlinear ofdm simulation http://www.citeulike.org/user/dcastro/article/674228 <i>Communications, IEEE Transactions on, Vol. 51, No. 2. (2003), pp. 267-274.</i><br /><br />We consider the general problem of the simulation of highly reliable systems operating in the presence of Gaussian noise. Our methodology uses importance sampling which has been shown to be a particularly effective method in the general discipline of rare-event simulation. The methods we propose are optimal in a certain sense, i.e., they are efficient. We also give a new class of simulation distributions that are universally efficient in the sense that they depend only on a single scalar parameter, regardless of the dimensionality of the underlying system or of the error sets to be simulated. On the Monte Carlo simulation of digital communication systems in Gaussian noise JA Bucklew R Radeke doi:10.1109/TCOMM.2003.809280 Communications, IEEE Transactions on, Vol. 51, No. 2. (2003), pp. 267-274. 2006-05-29T15:41:03-00:00 2003 Communications, IEEE Transactions on 51 2 267 274 communication digital monte-carlo noise simulation system http://www.citeulike.org/user/dcastro/article/2334047 <i>Rapid System Prototyping, 2004. Proceedings. 15th IEEE International Workshop on (2004), pp. 151-156.</i><br /><br />FPGA co-simulation of an IP core is an important design flow step in IP and system development. In this paper, we discuss how, with Xilinx's system generator for DSP 3.1 (XSG), it is possible for multiple-users to hardware co-simulate IP cores over any distance via TCP/IP, sharing only one FPGA board resource. The hardware co-simulation strategy is mutually exclusive in that only one user at any one time can hardware co-simulate on the FPGA board. We demonstrate this with the use of two encryption cores, Camellia and AES-128 (advanced encryption standard), which have both been generated using the block-based tool. The sharing of the FPGA board is handled with a set of Matlab function commands. Multi-user FPGA co-simulation over TCP/IP D Denning J Irvine D Stark M Delvin doi:10.1109/IWRSP.2004.1311110 Rapid System Prototyping, 2004. Proceedings. 15th IEEE International Workshop on (2004), pp. 151-156. 2008-02-05T10:24:20-00:00 2004 Rapid System Prototyping, 2004. Proceedings. 15th IEEE International Workshop on 151 156 fpga matlab simulation http://www.citeulike.org/user/dcastro/article/2327547 <i>Electronics Letters, Vol. 41, No. 15. (2005), pp. 868-869.</i><br /><br />The Euler-Maruyama (EM) method for the numerical integration of stochastic differential equations is applied to simulate tracking loops for Global Navigation Satellite System (GNSS) signals. Use of a large step size and two-point pseudorandom numbers allow for computationally efficient simulation of statistics such as the mean time to lose lock (MTLL). To demonstrate this method, non-coherent delay-lock loops are simulated using the EM method. The MTLL computed from an ensemble of 50 sample paths is compared to a numerical integration of the Fokker-Planck equation. The dependence of computational time and error on step size is evaluated. Numerical simulation of GNSS code tracking loops using Euler-Maruyama method JL Garrison L Liang doi:10.1049/el:20051050 Electronics Letters, Vol. 41, No. 15. (2005), pp. 868-869. 2008-02-03T22:58:07-00:00 2005 Electronics Letters 41 15 868 869 code gnss loop simulation tracking http://www.citeulike.org/user/dcastro/article/2067680 <i>Aerospace Conference, 2005 IEEE (2005), pp. 1475-1483.</i><br /><br />Most simulations of communications systems are done using a high-level language such as Matlab or C. As the complexity of these simulations grows and higher performance is expected, the runtime of the simulations becomes unacceptable. A promising solution to this problem is to move frequently executed (bottleneck) sections of the simulation into dedicated hardware that is implemented on field-programmable gate arrays (FPGAs). An FPGA, coupled with a very high-speed interface to the PC, is an ideal platform for such an accelerator. The system described in this paper is based on a PCI board with multiple Xilinx FPGAs. A typical wireless communications channel can be described as a finite impulse response (FIR) filter with time-varying coefficients. In this paper a FIR filter is implemented using dedicated hardware mapped onto a Xilinx FPGA board. The filter has additional hardware that interpolates between adjacent coefficients for more continuous and realistic results. The same filter is created in optimized Matlab for software simulation. Another common algorithm implemented in modern communication systems is a fast Fourier transform (FFT). This paper compares the software simulation and co-simulation approaches for both the FIR and the FFT blocks. Dramatic improvements in overall simulation throughput are demonstrated by using the hardware accelerator, as opposed to a pure software simulation. Hardware accelerated simulation tool (HAST) VS Lin RJ Speelman CI Daniels E Grayver PA Dafesh Aerospace Conference, 2005 IEEE (2005), pp. 1475-1483. 2007-12-06T16:54:03-00:00 2005 Aerospace Conference, 2005 IEEE 1475 1483 hardware simulation http://www.citeulike.org/user/dcastro/article/1992139 <i>Microwave Symposium Digest, 1993., IEEE MTT-S International (1993), pp. 889-892 vol.2.</i><br /><br />A comprehensive approach to microwave filter design which exploits accurate filed simulations driven directly by a gradient-based minimax optimizer is presented. Challenges of efficiency, discretization of geometrical dimensions, and continuity of optimization variables are reconciled by a three-stage attack: (1) efficient response interpolation; (2) smooth gradient estimation; and (3) dynamic database updating. The design optimization of two microstrip filters illustrates the technique described.<<ETX>> Minimax microstrip filter design using direct EM field simulation JW Bandler S Ye RM Biernacki SH Chen DG Swanson Microwave Symposium Digest, 1993., IEEE MTT-S International (1993), pp. 889-892 vol.2. 2007-11-27T10:27:34-00:00 1993 Microwave Symposium Digest, 1993., IEEE MTT-S International 889 892 vol.2 design filter microstrip simulation http://www.citeulike.org/user/dcastro/article/1676662 <i>(2006)</i> WiMAX channel: PHY model in network simulator 2 Leonardo Betancur Roberto Hincapié Roberto Bustamante doi:10.1145/1190455.1190459 (2006) 2007-09-19T17:48:13-00:00 2006 ACM Press channel ns2 simulation wimax http://www.citeulike.org/user/dcastro/article/456332 <i>Communications Magazine, IEEE, Vol. 43, No. 12. (2005), pp. 136-146.</i> Design and implementation of a simulator based on a cross-layer protocol between MAC and PHY layers in a WiBro compatible IEEE 802.16e OFDMA system Taesoo Kwon Howon Lee Sik Choi Juyeop Kim Dong-Ho Cho Sunghyun Cho Sangboh Yun Won-Hyoung Park Kiho Kim Communications Magazine, IEEE, Vol. 43, No. 12. (2005), pp. 136-146. 2006-01-05T15:44:55-00:00 2005 Communications Magazine, IEEE 43 12 136 146 80216 ofdm simulation wimax http://www.citeulike.org/user/dcastro/article/1915450 <i>Decision and Control, 1985 24th IEEE Conference on, Vol. 24 (1985), pp. 755-760.</i><br /><br />Annealing is the process of slowly cooling a physical system in order to obtain states with globally minimum energy. By simulating such a process, near globally-minimum-cost solutions can be found for very large optimization problems. The purpose of this paper is to review the basic theory of simulated annealing, to survey its recent applications, and to survey the theoretical approaches that have been used to study the technique. The applications include image restoration, combinatorial optimization (eg VLSI routing and placement), code design for communication systems and certain aspects of artificial intelligence. The theoretical tools for analysis include the theory of nonstationary Markov chains, statistical physics analysis techniques, large deviation theory and singular perturbation theory. A tutorial survey of theory and applications of simulated annealing Bruce Hajek Decision and Control, 1985 24th IEEE Conference on, Vol. 24 (1985), pp. 755-760. 2007-11-14T19:17:15-00:00 1985 Decision and Control, 1985 24th IEEE Conference on 24 755 760 annealing simulation tutorial http://www.citeulike.org/user/dcastro/article/1912979 <i>Communications, IEEE Transactions on, Vol. 40, No. 6. (1992), pp. 1111-1118.</i><br /><br />The problem of simulating error rates in direct sequence spread-spectrum code division multiple-access (CDMA) systems is examined. Due to the computational complexity required to simulate these systems, an importance sampling technique is developed based upon previous work by the authors. A conditional weighting function is derived such that the linear shift class of biasing densities can be employed. Results are given for a variety of detector structures and background noise distributions. It is shown that this biasing scheme can dramatically reduce the run time of realistic multiple-access simulations Efficient importance sampling techniques for simulation of multiuser communication systems GC Orsak B Aazhang Communications, IEEE Transactions on, Vol. 40, No. 6. (1992), pp. 1111-1118. 2007-11-14T09:26:41-00:00 1992 Communications, IEEE Transactions on 40 6 1111 1118 communication importance multiuser sampling simulation system technique