Sat, 19 Jul 2008 03:06:20 BST CiteULike: dcastro's architecture http://www.citeulike.org/user/dcastro/tag/architecture CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/dcastro/article/167418 <i>Communications Magazine, IEEE, Vol. 33, No. 5. (1995), pp. 26-38.</i><br /><br />As communications technology continues its rapid transition from analog to digital, more functions of contemporary radio systems are implemented in software, leading toward the software radio. This article provides a tutorial review of software radio architectures and technology, highlighting benefits, pitfalls, and lessons learned. This includes a closer look at the canonical functional partitioning of channel coding into antenna, RF, IF, baseband, and bitstream segments. A more detailed look at the estimation of demand for critical resources is key. This leads to a discussion of affordable hardware configurations, the mapping of functions to component hardware, and related software tools. This article then concludes with a brief treatment of the economics and likely future directions of software radio technology The software radio architecture J Mitola doi:10.1109/35.393001 Communications Magazine, IEEE, Vol. 33, No. 5. (1995), pp. 26-38. 2005-04-22T11:23:52-00:00 1995 Communications Magazine, IEEE 33 5 26 38 architecture radio software http://www.citeulike.org/user/dcastro/article/2648148 <i>Aerospace Conference, 2001, IEEE Proceedings., Vol. 3 (2001), pp. 3/1075-3/1084 vol.3.</i><br /><br />Future human missions to Mars will require effective communications supporting exploration activities and scientific field data collection. Constraints on cost, size, weight and power consumption for all communications equipment make optimization of these systems very important. These information and communication systems connect people and systems together into coherent teams performing the difficult and hazardous tasks inherent in planetary exploration. The communication network supporting vehicle telemetry data, mission operations, and scientific collaboration must have excellent reliability and flexibility. We propose hybrid communication architectures consisting of space-based links, a surface-based deployable mid-range communications network and a cluster of short-range links to solve the problems of connectivity and bandwidth, while meeting the other constraints of weight and power. A network of orbiting satellites could cover much of the planet surface, but this space-based capability may not be optimal for cost or performance. Specifically, a minimal space-based capability can be augmented using mobile cellular repeaters deployable by robots and human EVA. This method results in an increase in the number of radio nodes, but the distances separating them is decreased. This results in a significant increase in bandwidth and decrease in radio power and therefore node size, complexity and power consumption. The paper discusses the results of field-testing such hybrid radio systems for the support of scientific surveys. System analysis of design tradeoffs will yield insight into optimal solutions that will be compared to other approaches providing a method of effectively evaluating new candidate architectures Communication system architecture for planetary exploration R Alena B Gilbaugh B Glass SP Braham doi:10.1109/AERO.2001.931336 Aerospace Conference, 2001, IEEE Proceedings., Vol. 3 (2001), pp. 3/1075-3/1084 vol.3. 2008-04-10T06:42:43-00:00 2001 Aerospace Conference, 2001, IEEE Proceedings. 3 3/1075 3/1084 vol.3 architecture communication plancom space system http://www.citeulike.org/user/dcastro/article/2648124 <i>Aerospace Conference, 2005 IEEE (2005), pp. 1266-1285.</i><br /><br />The National Aeronautics and Space Administration (NASA) Exploration Systems Mission Directorate is planning a series of human and robotic missions to the Earth's Moon and to Mars. These missions will require telecommunication and navigation services. This paper sets forth presumed requirements for such services and presents strawman lunar and Mars telecommunications network architectures to satisfy the presumed requirements. The paper suggests that a modest ground network would suffice for missions to the near-side of the Moon. A constellation of three Lunar Telecommunications Orbiters connected to a modest ground network could provide continuous redundant links to a polar lunar base and its vicinity. For human and robotic missions to Mars, a pair of areostationary satellites could provide continuous redundant links between a mid-latitude Mars base and Deep Space Network antennas augmented by large arrays of 12-m antennas. Integrated network architecture for sustained human and robotic exploration GK Noreen RJ Cesarone LJ Deutsch CD Edwards JA Soloff T Ely BM Cook DD Morabito H Hemmati H Hemmati S Piazzolla A10 R Hastrup A11 DS Abraham A12 MK Sue A13 F Manshadi A14 doi:10.1109/AERO.2005.1559417 Aerospace Conference, 2005 IEEE (2005), pp. 1266-1285. 2008-04-10T06:29:59-00:00 2005 Aerospace Conference, 2005 IEEE 1266 1285 architecture integrated mars network plancom http://www.citeulike.org/user/dcastro/article/2601150 <i>Solid-State Circuits, IEEE Journal of, Vol. 42, No. 6. (2007), pp. 1291-1299.</i><br /><br /><para> The signals received by two antennas can be processed by a single time-shared receiver but only in the absence of interferers and channel-select filters. A low-IF receiver architecture is introduced that translates two antenna signals to positive and negative frequencies in the complex domain, reducing the number of baseband A/D converters by a factor of two. A dual-receiver prototype designed and fabricated in 0.18-<formula formulatype="inline"><tex>$mu$</tex></formula>m CMOS technology provides a sensitivity of <formula formulatype="inline"><tex>$-72$</tex> </formula> dBm with an EVM of <formula formulatype="inline"><tex>$-25$</tex> </formula> dB for 64 QAM signals while drawing 60.2 mW from a 1.8-V supply. </para> A Receiver Architecture for Dual-Antenna Systems H Rafati B Razavi doi:10.1109/JSSC.2007.897150 Solid-State Circuits, IEEE Journal of, Vol. 42, No. 6. (2007), pp. 1291-1299. 2008-03-27T08:23:01-00:00 2007 Solid-State Circuits, IEEE Journal of 42 6 1291 1299 antenna architecture dual receiver system http://www.citeulike.org/user/dcastro/article/2506886 <i>Circuits and Systems, 2005. 48th Midwest Symposium on (2005), pp. 1621-1624 Vol. 2.</i><br /><br />The trend toward increasing the data rate and providing the customers with wireless broadband access has initiated WIMAX systems. IEEE 802.16e, the mobile version of IEEE 802.16, provides WMAN (wireless metropolitan area network). Such system would need to work in the hostile environment of cellular phones and hence has the tough blocker requirements of GSM while providing the quality of service of WLAN (IEEE 802.11a/g). Combination of these factors imposes stringent requirements on system and block level. Convergence of WiMAX and WLAN facilitates the broadband accessibility by using the already existing wireless networks wherever there is a WLAN hot spot. This paper proposes a fully integrated solution for a multiband WIMAX/WLAN system based on a zero-IF architecture. System requirements are analyzed and block level specifications are derived. Challenges in system and block level are discussed and solutions are offered based on the current sub-micron CMOS technologies. WiMAX/WLAN radio receiver architecture for convergence in WMANS BJ Farahani M Ismail doi:10.1109/MWSCAS.2005.1594427 Circuits and Systems, 2005. 48th Midwest Symposium on (2005), pp. 1621-1624 Vol. 2. 2008-03-11T10:30:31-00:00 2005 Circuits and Systems, 2005. 48th Midwest Symposium on 1621 1624 Vol. 2 architecture radio receiver wimax wlan 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/2421342 <i>Communications Magazine, IEEE, Vol. 33, No. 5. (1995), pp. 62-68.</i><br /><br />Operational tests and demonstrations of systems based on software radios are currently being performed in the 800 MHz mobile cellular radio band. These field trials are for mobile unit geolocation systems and adaptive phased array “smart antenna” applications. The geolocation system trials are in response to the demand for high confidence geolocation of mobile units for enhanced emergency 911 service and for use in the US Department of Transportation's Intelligent Vehicle Highway System (NHS) initiative. The smart antenna array application addresses the cellular service providers' need for more user channel capacity and/or geographic coverage from existing base station installations. Software radio architectures were selected because of their ability to provide superior performance at low life cycle cost. These systems use 4 to 8 wideband coherent channels and fully characterize the arriving RF energy to either geolocate the emitter or to maximize the carrier-to-interference ratio Direction finding and “smart antennas” using software radio architectures J Kennedy MC Sullivan doi:10.1109/35.392997 Communications Magazine, IEEE, Vol. 33, No. 5. (1995), pp. 62-68. 2008-02-24T12:59:52-00:00 1995 Communications Magazine, IEEE 33 5 62 68 antenna architecture direction radio smart software http://www.citeulike.org/user/dcastro/article/2421336 <i>Solid-State Circuits Conference, 2004. Digest of Technical Papers. ISSCC. 2004 IEEE International (2004), pp. 12-13.</i> SE1 Architectures and Circuits for Ultra Wideband Radio A Chandrakasan T Stetzler R Koch Solid-State Circuits Conference, 2004. Digest of Technical Papers. ISSCC. 2004 IEEE International (2004), pp. 12-13. 2008-02-24T12:55:28-00:00 2004 Solid-State Circuits Conference, 2004. Digest of Technical Papers. ISSCC. 2004 IEEE International 12 13 architecture circuit uwb http://www.citeulike.org/user/dcastro/article/2421332 <i>ASIC/SOC Conference, 2002. 15th Annual IEEE International (2002), pp. 479-480.</i> Workshop on transceiver architecture and components for wireless communication system S Martin Zhengxiang Ma ASIC/SOC Conference, 2002. 15th Annual IEEE International (2002), pp. 479-480. 2008-02-24T12:53:18-00:00 2002 ASIC/SOC Conference, 2002. 15th Annual IEEE International 479 480 architecture communication component system transceiver wireless workshop http://www.citeulike.org/user/dcastro/article/2410424 <i>Communications, IEEE Transactions on, Vol. 37, No. 8. (1989), pp. 804-813.</i><br /><br />Using the maximum-likelihood approach, algorithms for detection and synchronization are derived that are well suited for VLSI implementation. Special emphasis is placed on an all-digital implementation where carrier and clock synchronization do not require a feedback of signals to the analog part, which simplifies the analog front-end design (mixing oscillator and A/D converter sampling clock run at fixed frequency). An important advantage of the proposed algorithms is that a high clock rate is not required; only two-four times the symbol rate is needed, depending on amplitude quantization. Implementation aspects, e.g. architecture, and quantization, are considered. A prototype is described which was implemented to prove the feasibility of the concept and to evaluate the performance under practical conditions An all digital receiver architecture for bandwidth efficient transmission at high data rates G Ascheid M Oerder J Stahl H Meyr doi:10.1109/26.31179 Communications, IEEE Transactions on, Vol. 37, No. 8. (1989), pp. 804-813. 2008-02-22T08:15:11-00:00 1989 Communications, IEEE Transactions on 37 8 804 813 architecture digital receiver