Sat, 26 Jul 2008 06:38:37 BST CiteULike: gixgax's library [286 articles] http://www.citeulike.org/user/gixgax CiteULike.org en-gb Copyright © 2004-2008 citeulike.org http://www.citeulike.org/user/gixgax/article/695971 <i>(05 August 1994)</i><br /><br />Carefully written to cover all necessary background material from both linear and non-linear programming as well as probability theory, the book brings together the methods and techniques previously described in disparate sources. Topics include decision trees and dynamic programming, recourse problems, probabilistic constraints, preprocessing and network problems. Emphasises the appropriate use of the techniques described. Exercises are provided at the end of each chapter. Stochastic Programming (Wiley-Interscience Series in Systems and Optimization) Peter Kall Stein Wallace (05 August 1994) 2006-06-14T16:06:49-00:00 1994 Wiley John & Sons stochastic http://www.citeulike.org/user/gixgax/article/163662 <i>(08 March 2004)</i><br /><br />Convex optimization problems arise frequently in many different fields. A comprehensive introduction to the subject, this book shows in detail how such problems can be solved numerically with great efficiency. The focus is on recognizing convex optimization problems and then finding the most appropriate technique for solving them. The text contains many worked examples and homework exercises and will appeal to students, researchers and practitioners in fields such as engineering, computer science, mathematics, statistics, finance, and economics. Convex Optimization Stephen Boyd Lieven Vandenberghe (08 March 2004) 2005-04-18T19:00:14-00:00 2004 Cambridge University Press no-tag http://www.citeulike.org/user/gixgax/article/2632740 <i>(2007)</i> Multipath Code Casting for Wireless Mesh Networks Bozidar Radunovic Christos Gkantsidis Peter Key Steluta Gheorghiu Wenjun Hu Pablo Rodriguez (2007) 2008-04-05T15:04:36-00:00 2007 network network-coding wireless http://www.citeulike.org/user/gixgax/article/2630101 <i>Information Sciences and Systems, 2007. CISS '07. 41st Annual Conference on (2007), pp. 248-252.</i><br /><br />In this paper we examine possible ways that feedback can be used, in the context of systems with network coding capabilities. We illustrate, through a number of simple examples, that use of feedback can be employed for parameter adaptation to satisfy QoS requirements as well as for reliability purposes. We also argue that there are benefits in applying network coding to the feedback packets themselves, and finally, we examine the design of acknowledgment packets. On Feedback for Network Coding C Fragouli D Lun M Medard P Pakzad doi:10.1109/CISS.2007.4298308 Information Sciences and Systems, 2007. CISS '07. 41st Annual Conference on (2007), pp. 248-252. 2008-04-04T16:07:17-00:00 2007 Information Sciences and Systems, 2007. CISS '07. 41st Annual Conference on 248 252 arq fec network network-coding wireless http://www.citeulike.org/user/gixgax/article/2630076 <i>(13 Feb 2008)</i><br /><br />A new coding and queue management algorithm is proposed for communication networks that employ linear network coding. The algorithm has the feature that the encoding process is truly online, as opposed to a block-by-block approach. The setup assumes a packet erasure broadcast channel with stochastic arrivals and full feedback, but the proposed scheme is potentially applicable to more general lossy networks with link-by-link feedback. The algorithm guarantees that the physical queue size at the sender tracks the backlog in degrees of freedom (also called the virtual queue size). The new notion of a node "seeing" a packet is introduced. In terms of this idea, our algorithm may be viewed as a natural extension of ARQ schemes to coded networks. Our approach, known as the drop-when-seen algorithm, is compared with a baseline queuing approach called drop-when-decoded. It is shown that the expected queue size for our approach is $O(\frac11-ρ)$ as opposed to $Ω(\frac1(1-ρ)^2)$ for the baseline approach, where $ρ$ is the load factor. ARQ for Network Coding Jay Sundararajan Devavrat Shah Muriel M&#xe9;dard (13 Feb 2008) 2008-04-04T15:51:51-00:00 2008 arq network network-coding wireless http://www.citeulike.org/user/gixgax/article/1894425 <i>(2007), pp. 385-396.</i> Understanding and mitigating the impact of RF interference on 802.11 networks Ramakrishna Gummadi David Wetherall Ben Greenstein Srinivasan Seshan doi:10.1145/1282380.1282424 (2007), pp. 385-396. 2007-11-10T11:52:53-00:00 2007 385 396 ACM 80211 interference http://www.citeulike.org/user/gixgax/article/1378877 <i>Operator-Assisted (Wireless Mesh) Community Networks, 2006 1st Workshop on (2006), pp. 1-11.</i><br /><br />A community network must be usable for inexperienced end users; thus self-organization is essential. On the one hand, we propose an approach for self-organization in ad-hoc wireless multi-hop mesh networks, where the client is fully freed from such mundane tasks as IP configuration, etc. On the other hand, the community mesh network itself is fully self-organized thus no operator or provider is required. We present the architecture of the Berlin RoofNet (BRN) and a distributed realization of services like DHCP, ARP and Internet gateway discovery and selection. In addition, results of a detailed simulation and experimental evaluation comparing our distributed hash table based approach to traditional methods are presented. We show that our approach is more reliable, efficient and responsive Self-Organization in Community Mesh Networks The Berlin RoofNet R Sombrutzki A Zubow M Kurth JP Redlich Operator-Assisted (Wireless Mesh) Community Networks, 2006 1st Workshop on (2006), pp. 1-11. 2007-06-11T15:32:21-00:00 2006 Operator-Assisted (Wireless Mesh) Community Networks, 2006 1st Workshop on 1 11 80211 dht network wireless http://www.citeulike.org/user/gixgax/article/1025071 <i>Industrial Electronics, IEEE Transactions on, Vol. 49, No. 6. (2002), pp. 1265-1282.</i><br /><br />The design and simulation of coding schemes, medium access control (MAC), and link-layer protocols for future industrial wireless local area networks can be supported by some understanding of the statistical properties of the bit error patterns delivered by a wireless link (which is an ensemble of transmitter, channel, receiver, modems). The authors present results of bit error measurements taken with an IEEE 802.11-compliant radio modem in an industrial environment. In addition to reporting the most important results, they draw some conclusions for the design of MAC and link-layer protocols. Furthermore, they show that the popular Gilbert/Elliot model and a modified version of it are a useful tool for simulating bit errors on a wireless link, despite their simplicity and failure to match certain measured statistics. Measurements of a wireless link in an industrial environment using an IEEE 802.11-compliant physical layer A Willig M Kubisch C Hoene A Wolisz doi:10.1109/TIE.2002.804974 Industrial Electronics, IEEE Transactions on, Vol. 49, No. 6. (2002), pp. 1265-1282. 2007-01-04T15:01:03-00:00 2002 Industrial Electronics, IEEE Transactions on 49 6 1265 1282 80211 error-analysis mac measurement network phy propagation wireless http://www.citeulike.org/user/gixgax/article/447085 <i>(09 August 2002)</i><br /><br />This is the long-awaited 3rd Edition of Tanenbaum's classic book on computer networking. The finest network engineer I know (who was stolen from my previous employer by developers of IPv6) swears by this book, and it is arguably the best single resource for gaining a good technical understanding of modern networking in the mid 1990s. Very Highly Recommended. Computer Networks, Fourth Edition Andrew Tanenbaum (09 August 2002) 2005-12-22T08:49:48-00:00 2002 Prentice Hall PTR mac network phy http://www.citeulike.org/user/gixgax/article/394503 <i>Vol. 34, No. 4. (October 2004), pp. 121-132.</i> Link-level measurements from an 802.11b mesh network Daniel Aguayo John Bicket Sanjit Biswas Glenn Judd Robert Morris doi:10.1145/1015467.1015482 Vol. 34, No. 4. (October 2004), pp. 121-132. 2005-11-15T20:48:51-00:00 2004 0146-4833 34 4 121 132 ACM Press 80211 fading measurement network propagation wireless http://www.citeulike.org/user/gixgax/article/911061 <i>(2006), pp. 74-85.</i> Long-distance 802.11b links: performance measurements and experience Kameswari Chebrolu Bhaskaran Raman Sayandeep Sen doi:10.1145/1161089.1161099 (2006), pp. 74-85. 2006-10-24T11:55:09-00:00 2006 74 85 ACM Press 80211 antenna fading measurement multi-channel network phy propagation wireless http://www.citeulike.org/user/gixgax/article/2613363 <i>(December 2007)</i><br /><br />We present Cross-layer Unicast Transmission Time (X-UTT), a MAC-aware load-independent link cost metric for 802.11- based wireless mesh networks. X-UTT utilizes information acquired from a network-layer unicast probing system and a MAC-layer monitoring system. It is designed to capture the wireless link capacity and be independent of the load induced by self-interference and cross-interference in a mesh network. We present experiments that validate these two properties on our mesh network testbed. These properties can be further exploited in the design of stable path metrics and routing protocols for wireless mesh networks. Cross-Layer Load-Independent Link Cost Metric for Wireless Mesh Networks Marianna Carrera Henrik Lundgren Theodoros Salonidis Christophe Diot (December 2007) 2008-03-30T15:33:37-00:00 2007 80211 mac measurement network routing wireless http://www.citeulike.org/user/gixgax/article/2586377 <i>SIGMOBILE Mob. Comput. Commun. Rev., Vol. 11, No. 4. (October 2007), pp. 57-71.</i> MiniMesh: an opportunistic transmission protocol for the IEEE 802.15.3 MAC Kwan-Wu Chin Darryn Lowe doi:10.1145/1347364.1347365 SIGMOBILE Mob. Comput. Commun. Rev., Vol. 11, No. 4. (October 2007), pp. 57-71. 2008-03-25T15:43:35-00:00 2007 SIGMOBILE Mob. Comput. Commun. Rev. 1559-1662 11 4 57 71 ACM mac network opportunistic uwb wireless http://www.citeulike.org/user/gixgax/article/2586083 <i>(January 2007)</i><br /><br />Simulating wireless networks accurately is a non-trivial task because of the large parameter space that affects the performance of such networks. Increasing the amount of detail in the simulation model increases these requirements by many times. Hence there is a need to develop suitable abstractions that maintain the accuracy of the simulation while keeping the computational resource requirements low. The topic of wireless network simulation models is explored in this research, concentrating on the medium access control and the physical layers. In the recent years, a large amount of research has focussed on various kinds of wireless networks to fit various application domains. Mobile Ad-Hoc Networks (MANETs), Wire- less Local Area Networks (WLANs), and Sensor Networks are a few examples.The IEEE 802.11 Physical layer(PHY) and Medium Access Control (MAC) layer are the most popular wireless technologies in practice. Consequently, most implementations use the IEEE 802.11 specifications as the basis for higher layer protocol design and analyses. In this dissertation, we explore the correctness, efficiency, and realism of wireless network simulations. We concentrate on the 802.11-based wireless network simulations, although the methods and results can also be used for various other wireless network simulations too. While many simulators model the IEEE 802.11 wireless networks, almost all of them tend to make some abstractions to lessen the computation burden and to obtain reasonable results. A comparitive study of three wireless simulators is made with respect to the correctness of their ideal behavior as well as their behavior under a high degree of load. Further, the physical-layer abstraction in wireless network simulations tends to be very simplistic because of the huge computational requirements that are needed to accurately model the various propagation, fading, and shadowing models. When mobility is taken into account several other issues like the Doppler effect should also be accounted for. This dissertation explores an empirical way to model the physical layer which cumula- tively accounts for all these effects. From a network protocol designers perspective, it is the cumulative effect of all these parameters that is of interest. Our major contribution has been the investigation of novel empirical models of the wireless physical layer, which account for node mobility and other effects in an outdoor environment. These models are relatively more realistic and efficient when implemented in a simulation environment. Our simulation experiments validate the models and pro- vide simulation results which closely match our outdoor experiments. Another significant contribution is in understanding and design of wireless network simulation models. Correct, Efficient, and Realistic Wireless Network Simulations Dheeraj Subbareddy (January 2007) 2008-03-25T14:34:19-00:00 2007 80211 measurement model network propagation simulation wireless http://www.citeulike.org/user/gixgax/article/2585991 <i>Wireless Communications and Networking Conference, 2006. WCNC 2006. IEEE, Vol. 1 (2006), pp. 587-592.</i> Modeling environmental mobility and its effect on network protocol stack M Varshney Zhengrong Ji M Takai R Bagrodia doi:10.1109/WCNC.2006.1683528 Wireless Communications and Networking Conference, 2006. WCNC 2006. IEEE, Vol. 1 (2006), pp. 587-592. 2008-03-25T14:25:34-00:00 2006 Wireless Communications and Networking Conference, 2006. WCNC 2006. IEEE 1 587 592 fading mac measurement mobility model network propagation wireless http://www.citeulike.org/user/gixgax/article/2411391 <i>INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE (2007), pp. 1928-1936.</i> Cluster-Based Forwarding for Reliable End-to-End Delivery in Wireless Sensor Networks Q Cao T Abdelzaher T He R Kravets doi:10.1109/INFCOM.2007.224 INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE (2007), pp. 1928-1936. 2008-02-22T09:48:08-00:00 2007 INFOCOM 2007. 26th IEEE International Conference on Computer Communications. IEEE 1928 1936 cooperation network opportunistic protocols simulation wireless http://www.citeulike.org/user/gixgax/article/2584642 <i>Wireless Communications and Networking Conference, 2006. WCNC 2006. IEEE, Vol. 3 (2006), pp. 1408-1413.</i> Characterizing temporal SNR variation in 802.11 networks RK Guha S Sarkar doi:10.1109/WCNC.2006.1696493 Wireless Communications and Networking Conference, 2006. WCNC 2006. IEEE, Vol. 3 (2006), pp. 1408-1413. 2008-03-25T11:28:34-00:00 2006 Wireless Communications and Networking Conference, 2006. WCNC 2006. IEEE 3 1408 1413 80211 measurement network phy wireless http://www.citeulike.org/user/gixgax/article/311898 <i>(2002), pp. 24-35.</i> Opportunistic media access for multirate ad hoc networks B Sadeghi V Kanodia A Sabharwal E Knightly doi:10.1145/570645.570650 (2002), pp. 24-35. 2005-09-06T11:30:10-00:00 2002 24 35 ACM Press 80211 bit-rate mac network simulation wireless http://www.citeulike.org/user/gixgax/article/2372617 <i>Ad-Hoc, Mobile, and Wireless Networks (2006), pp. 87-100.</i><br /><br />In this paper, we outline a simple approach, called ROAR, that enables the Ad-Hoc On-Demand Distance Vector (AODV) routing protocol to strengthen its routes by recruiting neighbors of nodes on the least cost path as support nodes during the route construction process, and working closely with the medium access control (MAC) to employ an opportunistic forwarding scheme that takes advantage of the node diversity at each hop. We have implemented ROAR in the ns-2 simulator over the IEEE 802.11a physical layer. From our simulation studies conducted using various network topologies and realistic radio propagation model, we find that ROAR increases AODV’s packet delivery ratio and end-to-end throughput several orders of magnitude, in particular for hop count based routes. Therefore, ROAR provides a simple add-on that allows routing protocols to reap the benefits of diversity without relying on physical layer approaches. ROAR: A Multi-rate Opportunistic AODV Routing Protocol for Wireless Ad-Hoc Networks Kwan-Wu Chin Darryn Lowe doi:10.1007/11814764_9 Ad-Hoc, Mobile, and Wireless Networks (2006), pp. 87-100. 2008-02-14T05:03:03-00:00 2006 Ad-Hoc, Mobile, and Wireless Networks 87 100 80211 bit-rate mac network opportunistic performance routing simulation wireless http://www.citeulike.org/user/gixgax/article/1397083 <i>Communications Magazine, IEEE, Vol. 35, No. 9. (1997), pp. 148-155.</i> Rayleigh Fading Channels in Mobile Digital Communication Systems Part II: Mitigation B Sklar doi:10.1109/MCOM.1997.621038 Communications Magazine, IEEE, Vol. 35, No. 9. (1997), pp. 148-155. 2007-06-18T14:20:05-00:00 1997 Communications Magazine, IEEE 35 9 148 155 fading network phy wireless http://www.citeulike.org/user/gixgax/article/618262 <i>(2005), pp. 181-188.</i> Impact of multipath fading in wireless ad hoc networks John Mullen Hong Huang doi:10.1145/1089803.1089984 (2005), pp. 181-188. 2006-05-08T22:42:34-00:00 2005 181 188 ACM Press fading interference mac mesh network phy propagation routing wireless http://www.citeulike.org/user/gixgax/article/2507068 <i>(08 January 1982)</i><br /><br />A unified treatment of models and statistical methods used in the analysis of lifetime or response time data. Draws together the most important, up-to-date methods used in engineering, medical and the biological sciences, including parametric, distribution-free, nonparametric, and graphical methods. Numerical illustrations and examples involving real data demonstrate the application of each method to problems in areas such as reliability, product performance evaluation, clinical trials, and experimentation in the biomedical sciences. Statistical Models and Methods for Lifetime Data (Wiley Series in Probability & Mathematical Statistics) JF Lawless Jerald Lawless (08 January 1982) 2008-03-11T10:51:18-00:00 1982 John Wiley & Sons no-tag http://www.citeulike.org/user/gixgax/article/2315116 <i>SIGMOBILE Mob. Comput. Commun. Rev., Vol. 10, No. 4. (October 2006), pp. 1-2.</i> On selection of candidates for opportunistic anypath forwarding Zifei Zhong Junling Wang Srihari Nelakuditi Guor-Huar Lu doi:10.1145/1215976.1215978 SIGMOBILE Mob. Comput. Commun. Rev., Vol. 10, No. 4. (October 2006), pp. 1-2. 2008-01-31T14:24:10-00:00 2006 SIGMOBILE Mob. Comput. Commun. Rev. 1559-1662 10 4 1 2 ACM no-tag http://www.citeulike.org/user/gixgax/article/2373403 <i>IEIC Technical Report (Institute of Electronics, Information and Communication Engineers), Vol. 104, No. 123. (2004)</i> Distributed ARQ using STBC for OFDM Ad-hoc Networks Erina Kojima Takeo Fujii Yukihiro Kamiya Yasuo Suzuki IEIC Technical Report (Institute of Electronics, Information and Communication Engineers), Vol. 104, No. 123. (2004) 2008-02-14T11:06:01-00:00 2004 IEIC Technical Report (Institute of Electronics, Information and Communication Engineers) 104 123 ad-hoc arq cooperation network ofdm performance phy simulation spacial-diversity wireless http://www.citeulike.org/user/gixgax/article/2329682 <i>(30 Jan 2008)</i><br /><br />It is well-known that power control can affect the wireless network capacity. However, recent works show conflicting results: network capacity may increase or decrease with higher transmission power under different scenarios. In this work, we want to explore this paradox and provide fundamental understanding on power control. Specifically, we want to explore the following questions: (1)Theoretically, should we increase or decrease transmission power to maximize network capacity? (2) Theoretically, how much network capacity gain can we achieve when using power control? (3) Under realistic situations, how do power control, link scheduling and routing interact with each other? Under which scenarios can we expect a large capacity gain by using higher transmission power? To answer these questions, firstly, we prove that the optimal network capacity is a non-decreasing function of transmission power. Secondly, we prove that the optimal network capacity can be increased unlimitedly by higher transmission power in some network configurations. However, when nodes are distributed uniformly, the gain of optimal network capacity by higher transmission power is upper-bounded by a positive constant. Thirdly, we discuss why network capacity in practice may increase or decrease with higher transmission power under different scenarios using carrier sensing and the minimum hop-count routing. Extensive simulations are carried out to verify our analysis. This work provides a deeper understanding on how power control can affect network capacity. Besides the theoretical contributions, it offers some design intuitions to wireless network researchers. Understanding the Paradox of Power Control on the Capacity of Wireless Networks Yue Wang John Lui Dah Chiu (30 Jan 2008) 2008-02-04T14:56:19-00:00 2008 ad-hoc analysis capacity interference network power-control spacial-diversity wireless http://www.citeulike.org/user/gixgax/article/2329419 <i>Wireless Communications, IEEE Transactions on, Vol. 7, No. 1. (2008), pp. 118-127.</i> Selection Cooperation in Multi-Source Cooperative Networks E Beres R Adve doi:10.1109/TWC.2008.060184 Wireless Communications, IEEE Transactions on, Vol. 7, No. 1. (2008), pp. 118-127. 2008-02-04T12:46:15-00:00 2008 Wireless Communications, IEEE Transactions on 7 1 118 127 ad-hoc cooperation network phy spacial-diversity wireless http://www.citeulike.org/user/gixgax/article/2329259 <i>(2006), pp. 443-448.</i> DSMA: an access method for MIMO ad hoc networks based on distributed scheduling Paolo Casari Marco Levorato Michele Zorzi doi:10.1145/1143549.1143637 (2006), pp. 443-448. 2008-02-04T11:20:38-00:00 2006 443 448 ACM ad-hoc cross-layer design mac mimo network performance scheduling simulation spacial-diversity tdma wireless http://www.citeulike.org/user/gixgax/article/2329236 <i>Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st, Vol. 5 (2005), pp. 3132-3136 Vol. 5.</i><br /><br />This paper reports on the interim beyond-3G (B3G) channel model developed by and used within the European WINNER project. The model is a comprehensive spatial channel model for 2 and 5 GHz frequency bands and supports bandwidths up to 100 MHz in three different outdoor environments. It further features time-evolution of system-level parameters for challenging advanced communication algorithms, as well as a reduced-variability tapped delay-line model for improved usability in calibration and comparison simulations. An interim channel model for beyond-3G systems: extending the 3GPP spatial channel model (SCM) DS Baum J Hansen J Salo doi:10.1109/VETECS.2005.1543924 Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st, Vol. 5 (2005), pp. 3132-3136 Vol. 5. 2008-02-04T11:07:02-00:00 2005 Vehicular Technology Conference, 2005. VTC 2005-Spring. 2005 IEEE 61st 5 3132 3136 Vol. 5 fading model network phy propagation simulation wireless http://www.citeulike.org/user/gixgax/article/2329100 <i>SIGMOBILE Mob. Comput. Commun. Rev., Vol. 5, No. 4. (October 2001), pp. 47-54.</i> Selection diversity forwarding in a multihop packet radio network with fading channel and capture Peter Larsson doi:10.1145/509506.509517 SIGMOBILE Mob. Comput. Commun. Rev., Vol. 5, No. 4. (October 2001), pp. 47-54. 2008-02-04T10:22:00-00:00 2001 SIGMOBILE Mob. Comput. Commun. Rev. 1559-1662 5 4 47 54 ACM mac mesh network opportunistic performance protocols simulation wireless http://www.citeulike.org/user/gixgax/article/2318954 <i>(May 2007)</i> Trading Structure for Randomness in Wireless Opportunistic Routing Szymon Chachulski (May 2007) 2008-02-01T11:16:50-00:00 2007 brn-070312-1 http://www.citeulike.org/user/gixgax/article/2318940 <i>(July 2007)</i> An optimization framework for practical multipath routing in wireless mesh networks Bozidar Radunovic Christos Gkantsidis Peter Key Pablo Rodriguez Wenjun Hu (July 2007) 2008-02-01T11:11:28-00:00 2007 brn-070312-1 http://www.citeulike.org/user/gixgax/article/2308288 <i>(2006), pp. 419-420.</i> Understanding the causes of packet delivery success and failure in dense wireless sensor networks Kannan Srinivasan Prabal Dutta Arsalan Tavakoli Philip Levis doi:10.1145/1182807.1182885 (2006), pp. 419-420. 2008-01-30T19:20:45-00:00 2006 419 420 ACM no-tag http://www.citeulike.org/user/gixgax/article/1645402 <i>SIGCOMM Comput. Commun. Rev., Vol. 37, No. 4. (October 2007), pp. 169-180.</i> Trading structure for randomness in wireless opportunistic routing Szymon Chachulski Michael Jennings Sachin Katti Dina Katabi doi:10.1145/1282427.1282400 SIGCOMM Comput. Commun. Rev., Vol. 37, No. 4. (October 2007), pp. 169-180. 2007-09-11T20:06:02-00:00 2007 SIGCOMM Comput. Commun. Rev. 0146-4833 37 4 169 180 ACM Press brn-070312-1 http://www.citeulike.org/user/gixgax/article/1119260 <i>Communications, 1995. ICC 95 Seattle, Gateway to Globalization, 1995 IEEE International Conference on, Vol. 1 (1995), pp. 331-335 vol.1.</i><br /><br />We consider a power control scheme for maximizing the information capacity of the uplink in single-cell multiuser communications with frequency-flat fading, under the assumption that the users attenuations are measured perfectly. Its main characteristics are that only one user transmits over the entire bandwidth at any particular time instant and that the users are allocated more power when their channels are good, and less when they are bad. Moreover, these features are independent of the statistics of the fading. Numerical results are presented for the case of single-path Rayleigh fading. We show that an increase in capacity over a perfectly-power controlled (Gaussian) channel can be achieved, especially if the number of users is large. By examining the bit error-rate with antipodal signalling, we show the inherent diversity in multiuser communications over fading channels Information capacity and power control in single-cell multiuser communications R Knopp PA Humblet Communications, 1995. ICC 95 Seattle, Gateway to Globalization, 1995 IEEE International Conference on, Vol. 1 (1995), pp. 331-335 vol.1. 2007-02-23T20:15:34-00:00 1995 Communications, 1995. ICC 95 Seattle, Gateway to Globalization, 1995 IEEE International Conference on 1 331 335 vol.1 multi-user network power-control wireless http://www.citeulike.org/user/gixgax/article/2204063 <i>(2003)</i><br /><br />The ubiquitous trend to “go wireless” is a symbol of our need for independence and flexibility. To allow for such an “all-wireless” world, large amounts of information with widely varying content have to be exchanged, utilising a limited wireless spectrum. Wireless capacity is thus the keyword and research concentrates on an efficient utilisation of the available frequency spectrum. Recently, it has been proven that the link capacity in the Shannon sense of a Multiple-Input- Multiple-Output (MIMO) system can be substantially higher than that of a single link system. The promised limits, however, can only be reached if appropriate coding schemes are applied to spatially decorrelated propagation channels. Naturally, physical limitations within the mobile terminal will lead to mutual correlation among the antenna elements, jeopardising MIMO capacity bounds. In this thesis, a novel implementation of a MIMO wireless system is presented that allows the application of MIMO capacity enhancement techniques to mobile terminals with a limited number of antenna elements. Such a system can be realised by permitting adjacent mobile terminals to cooperate among each other and thus form a Virtual Antenna Array (VAA). The analysis presented here relates to a generalised deployment of VAAs, where an information source communicates with an information target via a given number of relaying VAAs. Each relaying VAA consists of distributed and possibly cooperating mobile terminals, thereby realising a distributed-MIMO multi-stage communication system. Such a system is shown in this thesis to yield a drastic increase in data throughput, where analysis is composed of three stages. First, novel information theoretical results are presented which characterise the capacity for ergodic channels and rate outage probability for non-ergodic channels at each relaying stage. For example, the capacity integral is introduced, and solved, which enables the derivation of closed form capacity expressions for Rayleigh flat fading MIMO channels, as well as space-time block encoded fading channels with arbitrary statistics and channel gains. Second, the previously derived capacity and rate outage probabilities are utilised to derive communication protocols which allocate resources in terms of power, bandwidth, and frame duration to each relaying stage such as to achieve maximum end-to-end data throughput from source to sink. The strategies are derived for general MIMO and space-time block encoded communication scenarios with transceivers of infinite complexity, where resources may or may not be reused among the relaying stages. The applicability of the protocols is assessed by means of numerous example scenarios. Third, fractional resource allocation strategies are derived which are near-optimum for finitecomplexity transceivers. The analysis is performed for space-time block encoded transceivers only, which is easily extended to any form of channel and space-time coding schemes if required. The exposure of the allocation strategies is preceded by the derivation of the error rates of distributed space-time block encoded communication systems. Again, numerous simulation results corroborate the applicability of the derived protocols. Virtual Antenna Arrays Mischa Dohler (2003) 2008-01-07T15:05:09-00:00 2003 analysis capacity cooperation mimo network phy virtual-antenna-array wireless http://www.citeulike.org/user/gixgax/article/2136863 <i>(14 Dec 2007)</i><br /><br />Fast rate adaptation has been established as an effective way to improve the PHY-layer raw date rate of wireless networks. However, within the current IEEE 802.11 legacy, MAC-layer throughput is dominated by users with the lowest data rates, resulting in underutilization of bandwidth. In this paper, we propose and analyze a novel distributed MAC strategy, referred to as Rate-aware DCF (R-DCF), to leverage the potential of rate adaptation in IEEE 802.11 WLANs. The key feature of R-DCF is that by introducing different mini slots according to the instantaneous channel conditions, only contending stations with the highest data rate can access the channel. In this way, the R-DCF protocol not only exploits multi-user diversity in a fully distributed manner but also reduces the loss of throughput due to collisions. Through analysis, we develop an analytical model to derive the throughput of R-DCF in general multi-rate WLANs. Using the analytical model we investigate the performance of R-DCF protocol in various network settings with different rate adaptation strategies and channel variations. Based on the analysis, we further derive the maximal throughput achievable by R-DCF. For practical implementation, an offline adaptive backoff method is developed to achieve a close-to-optimal performance at low runtime complexity. The superiority of R-DCF is proven via extensive analyses and simulations. Distributed MAC Strategy for Exploiting Multi-user Diversity in Multi-rate IEEE 802.11 Wireless LANs Da Chen Ying Jun Zhang (14 Dec 2007) 2007-12-17T15:05:38-00:00 2007 80211 analysis bit-rate csma mac network opportunistic performance protocols wireless http://www.citeulike.org/user/gixgax/article/2124691 <i>Communications, 2007. ICC '07. IEEE International Conference on (2007), pp. 3636-3641.</i><br /><br />In interference-rich and noisy environment, wireless communication is often hampered by unreliable communication links. Recently, there has been active research on cooperative communication that improves the communication reliability by having a collection of radio terminals transmit signals in a cooperative way. This paper proposes a medium access control (MAC) algorithm, called Cooperative Diversity Medium Access Control (CD-MAC), which exploits the cooperative communication capability to provide robust communication in wireless ad hoc networks. In CD-MAC, each terminal proactively selects a relay and lets it transmit simultaneously whenever necessary, mitigating interference from nearby terminals and thus improving the network performance. The proposed CD-MAC algorithm is designed based on the widely adopted IEEE 802.11 MAC for practicality. For accurate evaluation, this study presents and uses a realistic reception model by taking bit error rate (BER), derived from Intersil HFA3861B radio hardware, as well as frame error rate (FER) into consideration. System-level simulation study shows that CD-MAC significantly outperforms the original IEEE 802.11 MAC in terms of packet delivery ratio. CD-MAC: Cooperative Diversity MAC for Robust Communication in Wireless Ad Hoc Networks S Moh C Yu SM Park HN Kim Communications, 2007. ICC '07. IEEE International Conference on (2007), pp. 3636-3641. 2007-12-15T18:17:22-00:00 2007 Communications, 2007. ICC '07. IEEE International Conference on 3636 3641 80211 ad-hoc cooperation design interference mac mobility model network performance protocols simulation spacial-diversity wireless http://www.citeulike.org/user/gixgax/article/2113654 <i>Military Communications Conference, 2003. MILCOM 2003. IEEE, Vol. 2 (2003), pp. 1311-1318 Vol.2.</i><br /><br />Ad hoc wireless networks represent a new communication paradigm and could be an important means of providing ubiquitous communication in the future. Based on a recently developed communication-theoretic framework, in which the interaction between the medium access control (MAC) layer and the physical layer is taken into account, we investigate the performance of circuit switched ad hoc wireless networks. Upon the introduction of the concept of effective transport capacity, which represents the "actual" rate-distance product carried by the network and the maximum of which is the transport capacity of the network, an intuitive and simple approach for the evaluation of this quantity is proposed. In particular, two MAC protocols are considered: Aloha and perroute carrier sense multiple access (PR-CSMA). Numerical results indicate that for low values of the network traffic load the effective transport capacity achievable with Aloha is almost equal to that obtained in the ideal case without internode interference (INI). We also show the existence of a threshold value of the traffic load below which Aloha outperforms PR-CSMA, and above which the opposite is true. MAC protocols and transport capacity in ad hoc wireless networks: Aloha versus PR-CSMA G Ferrari OK Tonguz Military Communications Conference, 2003. MILCOM 2003. IEEE, Vol. 2 (2003), pp. 1311-1318 Vol.2. 2007-12-14T13:36:28-00:00 2003 Military Communications Conference, 2003. MILCOM 2003. IEEE 2 1311 1318 Vol.2 ad-hoc analysis capacity csma mac network wireless http://www.citeulike.org/user/gixgax/article/2113275 <i>EURASIP Journal on Wireless Communications and Networking (October 2007)</i><br /><br />A distributed and cooperative link-scheduling (DCLS) algorithm is introduced for large-scale multihop wireless networks. With this algorithm, each and every active link in the network cooperatively calibrates its environment and converges to a desired link schedule for data transmissions within a time frame of multiple slots. This schedule is such that the entire network is partitioned into a set of interleaved subnetworks, where each subnetwork consists of concurrent cochannel links that are properly separated from each other. The desired spacing in each subnetwork can be controlled by a tuning parameter and the number of time slots specified for each frame. Following the DCLS algorithm, a distributed and cooperative power control (DCPC) algorithm can be applied to each subnetwork to ensure a desired data rate for each link with minimum network transmission power. As shown consistently by simulations, the DCLS algorithm along with a DCPC algorithm yields significant power savings. The power savings also imply an increased feasible region of averaged link data rates for the entire network. Distributed and Cooperative Link Scheduling for Large-Scale Multihop Wireless Networks Kezhu Hong Yingbo Hua Ananthram Swami doi:10.1155/2007/34716 EURASIP Journal on Wireless Communications and Networking (October 2007) 2007-12-14T11:48:39-00:00 2007 EURASIP Journal on Wireless Communications and Networking cooperation interference mac mesh network power-control scheduling wireless http://www.citeulike.org/user/gixgax/article/773920 <i>The 3rd Symposium on Wireless Personal Multimedia Communications (2000)</i> Impact of shadow-fading in a mm-wave band wireless network M Flament M Unbehaun The 3rd Symposium on Wireless Personal Multimedia Communications (2000) 2006-07-26T01:37:22-00:00 2000 The 3rd Symposium on Wireless Personal Multimedia Communications no-tag http://www.citeulike.org/user/gixgax/article/773921 <i>Transactions on Antennas and Propagation, Vol. 46, No. 6. (1998)</i> Temporal variations of the indoor wireless millimeter-wave channel P Marinier GY Delisle CL Despins Transactions on Antennas and Propagation, Vol. 46, No. 6. (1998) 2006-07-26T01:39:58-00:00 1998 Transactions on Antennas and Propagation 46 6 no-tag http://www.citeulike.org/user/gixgax/article/2060626 <i>(06 December 2004)</i><br /><br />The four short years since Digital Communication over Fading Channels became an instant classic have seen a virtual explosion of significant new work on the subject, both by the authors and by numerous researchers around the world. Foremost among these is a great deal of progress in the area of transmit diversity and space-time coding and the associated multiple input-multiple output (MIMO) channel. This new edition gathers these and other results, previously scattered throughout numerous publications, into a single convenient and informative volume.<br> Like its predecessor, this Second Edition discusses in detail coherent and noncoherent communication systems as well as a large variety of fading channel models typical of communication links found in the real world. Coverage includes single- and multichannel reception and, in the case of the latter, a large variety of diversity types. The moment generating function (MGF)-based approach for performance analysis, introduced by the authors in the first edition and referred to in literally hundreds of publications, still represents the backbone of the book's presentation. Important features of this new edition include:<br> * An all-new, comprehensive chapter on transmit diversity, space-time coding, and the MIMO channel, focusing on performance evaluation<br> * Coverage of new and improved diversity schemes<br> * Performance analyses of previously known schemes in new and different fading scenarios<br> * A new chapter on the outage probability of cellular mobile radio systems<br> * A new chapter on the capacity of fading channels<br> * And much more<br> Digital Communication over Fading Channels, Second Edition is an indispensable resource for graduate students, researchers investigating these systems, and practicing engineers responsible for evaluating their performance. Digital Communication over Fading Channels (Wiley Series in Telecommunications and Signal Processing) Marvin Simon Mohamed-Slim Alouini (06 December 2004) 2007-12-05T11:37:21-00:00 2004 Wiley-IEEE Press capacity cdma fading model network phy propagation spacial-diversity wireless http://www.citeulike.org/user/gixgax/article/2040345 <i>Wireless Personal Communications, Vol. 43, No. 4. (15 December 2007), pp. 1751-1754.</i><br /><br />Abstract  In this letter, taking into account realistic propagation environments in the presence of log- normal shadowing, we analyze the outage performance of orthogonal space-time block coding (OSTBC) for an arbitrary finite number of transmit and receive antennas. An approximate expression for the outage probability of OSTBC over Rayleigh-fading multiple-input multiple-output (MIMO) channels with shadowing is presented. Finally we give some numerical results to verify our analysis. Outage Performance of OSTBC in MIMO Channels with Shadowing Liang Yang doi:10.1007/s11277-007-9341-9 Wireless Personal Communications, Vol. 43, No. 4. (15 December 2007), pp. 1751-1754. 2007-12-01T22:41:08-00:00 2007 Wireless Personal Communications 43 4 1751 1754 analysis capacity fading network phy spacial-diversity wireless http://www.citeulike.org/user/gixgax/article/897602 <i>(2006), pp. 525-530.</i> 802.11b/g Link Level Measurements for an Outdoor Wireless Campus Network Giuseppe Bianchi Fabrizio Formisano Domenico Giustiniano doi:10.1109/WOWMOM.2006.6 (2006), pp. 525-530. 2006-10-15T02:51:28-00:00 2006 525 530 IEEE Computer Society 80211 bit-rate error-analysis measurement network performance phy wireless http://www.citeulike.org/user/gixgax/article/2036999 <i>Found. Trends Netw., Vol. 1, No. 2. (July 2006), pp. 145-270.</i> Scaling laws for ad hoc wireless networks: an information theoretic approach Feng Xue PR Kumar doi:10.1561/1300000002 Found. Trends Netw., Vol. 1, No. 2. (July 2006), pp. 145-270. 2007-12-01T11:27:40-00:00 2006 Found. Trends Netw. 1 2 145 270 Now Publishers Inc. ad-hoc analysis capacity interference mesh network wireless http://www.citeulike.org/user/gixgax/article/1995589 <i>(21 July 2006)</i><br /><br /><P>Cooperation is known as an effective strategy in nature to achieve individual or common goals by forming cooperative groups. </P> <P>As the cross over between nature and engineering has always been fruitful, <STRONG>Cooperation in Wireless Networks: Principles and Applications</STRONG> advocates the use of cooperative strategies in the field of wireless communications. </P> <P>Whether to cooperate or act autonomously, i.e., in a more selfish manner, has to be decided by each wireless terminal individually. Following the rule "The real egoistic behavior is to cooperate", mutual aid among terminals will be applied if and only if it is beneficial for all group members. </P> <P><STRONG>Cooperation in Wireless Networks: Principles and Applications</STRONG> covers the underlying principles of cooperative techniques as well as several applications demonstrating the use of such techniques in practical systems. The work is written in a collaborative manner by several authors from Asia, America, and Europe. Twenty chapters introduce and discuss in detail the main cooperative strategies for the whole communication protocol stack from the application layer down to the physical layer. Furthermore power saving strategies, security, hardware realization, and user scenarios for cooperative communication systems are introduced and discussed. The book also summarizes the strength of cooperation for upcoming generation of wireless communication systems, clearly motivating the use of cooperative techniques and pointing out that cooperation will become one of the key technologies enabling 4G and beyond. This book puts into one volume a comprehensive and technically rich view of the wireless communications scene from a cooperation point of view.</P> Cooperation in Wireless Networks: Principles and Applications: Real Egoistic Behavior is to Cooperate! Frank Fitzek Marcos Katz (21 July 2006) 2007-11-27T17:55:39-00:00 2006 Springer cooperation mac mimo network phy virtual-antenna-array wireless http://www.citeulike.org/user/gixgax/article/1987519 <i>Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th, Vol. 1 (2002), pp. 228-232 vol.1.</i><br /><br />The aim of this study is to enhance the performance of the current 802.11a and HIPERLAN/2 standards by employing multiple antennas at the transmitter, receiver, or both. These systems use coded orthogonal frequency division multiplexing (COFDM) technology and provide channel adaptive data rates of up to 54 Mbits/s. However, the performance of both standards can be improved, especially in environments with high root mean square (RMS) delay spread where uncoded data suffers from significant interchannel interference. Current techniques such as receive diversity and space time block codes (STBC) are presented as a simple solution to enhance these standards. The paper explains the characteristics of these technique and results are presented in order to discuss their merits and demerits. The paper also determines which technique offers the highest performance without the addition of significant complexity at the receiver. Receive diversity techniques should be considered for inclusion in devices requiring large coverage and high data rates, and STBC for inclusion in fixed access point devices. Receive diversity versus space time block codes in IEEE 802.11a and ETSI HIPERLAN/2 AP Miguelez AR Nix JP Mcgeehan Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th, Vol. 1 (2002), pp. 228-232 vol.1. 2007-11-26T17:04:32-00:00 2002 Vehicular Technology Conference, 2002. Proceedings. VTC 2002-Fall. 2002 IEEE 56th 1 228 232 vol.1 80211 beamforming bit-rate mimo network ofdm performance phy spacial-diversity wireless http://www.citeulike.org/user/gixgax/article/1908248 <i>Wireless Communications and Networking Conference, 2007.WCNC 2007. IEEE (2007), pp. 577-581.</i><br /><br />The authors consider a system architecture whereby orthogonal space time block codes (OSTBCs) are applied to a distributed set of wireless nodes. The utility offered is that by employing diversity we are able to greatly reduce the necessary link margin usually required to combat fast fading. A distributed set of wireless nodes are particularly well suited for this task as they are typically separated with significant inter-node distance thus having highly uncorrelated channels to a collector. In a typical application, a wireless sensor network (WSN) will have nodes that may wish to transmit data to a possibly mobile standoff collection point. In this paper, the authors discuss many practical aspects necessary for a real-world implementation including time and frequency offset estimation as well as channel tracking. As the waveform has been targeted to field programmable gate array (FPGA) hardware, we look at the relative implementation complexity of each signal processing element. Implementation of the Alamouti OSTBC to a Distributed Set of Single-Antenna Wireless Nodes RE Cagley BT Weals SA Mcnally RA Iltis S Mirzaei R Kastner Wireless Communications and Networking Conference, 2007.WCNC 2007. IEEE (2007), pp. 577-581. 2007-11-13T18:16:33-00:00 2007 Wireless Communications and Networking Conference, 2007.WCNC 2007. IEEE 577 581 fading phy simulation spacial-diversity http://www.citeulike.org/user/gixgax/article/1378866 <i>European Wireless 2007 (1 April 2007)</i><br /><br />We propose and investigate Multi-Channel Extremely Opportunistic Routing (MCExOR) which is a protocol that extends Extremely Opportunistic Routing by utilizing multiple RF channels in multi-hop wireless networks. Large numbers of transmissions per end-to-end delivery combined with interference are the main reasons for the low capacity of wireless multi-hop networks. MCExOR reduces the overall number of transmissions in wireless multi-hop networks by opportunistically skipping nodes in a packet’s forwarding path. The use of multiple non overlapping RF channels contributes to the reduction of overall interference. In contrast to other approaches MCExOR only needs one RF transceiver per device. We present an algorithm for packet forwarding and show with the help of simulations that MCExOR outperforms traditional protocols like adhoc on-demand distance vector routing through the simultaneous use of multiple RF channels. In combination with realistic radio propagation models a further increase in the throughput is observed due to the opportunistic feature of MCExOR. With the increasing number of RF channels the overall throughput increases superproportionally. MCExOR with 2 RF channels surpasses AODV by an average of 140%. Unlike other multi channel approaches even a single packet flow can benefit from the existence of multiple channels. Finally, MCExOR is more robust than traditional protocols since it offers a higher end-to-end packet delivery. Multi-Channel Opportunistic Routing Anatolij Zubow Mathias Kurth Jens-Peter Redlich European Wireless 2007 (1 April 2007) 2007-06-11T15:26:10-00:00 2007 European Wireless 2007 80211 cross-layer design mac mesh multi-channel network opportunistic performance protocols routing wireless http://www.citeulike.org/user/gixgax/article/1860610 <i>(08 August 2005)</i><br /><br />Wireless technology is a truly revolutionary paradigm shift, enabling multimedia communications between people and devices from any location. It also underpins exciting applications such as sensor networks, smart homes, telemedicine, and automated highways. This book provides a comprehensive introduction to the underlying theory, design techniques and analytical tools of wireless communications, focusing primarily on the core principles of wireless system design. The book begins with an overview of wireless systems and standards. The characteristics of the wireless channel are then described, including their fundamental capacity limits. Various modulation, coding, and signal processing schemes are then discussed in detail, including state-of-the-art adaptive modulation, multicarrier, spread spectrum, and multiple antenna techniques. The concluding chapters deal with multiuser communications, cellular system design, and ad-hoc network design. Design insights and tradeoffs are emphasized throughout the book. It contains many worked examples, over 200 figures, almost 300 homework exercises, over 700 references, and is an ideal textbook for students. The book is also a valuable reference for engineers in the wireless industry. Andrea Goldsmith received her Ph.D. from the University of California, Berkeley, and is an Associate Professor of Electrical Engineering at Stanford University. Prior to this she was an Assistant Professor at the California Institute of Technology. She has also held positions in industry at Maxim Technologies and AT&T Bell Laboratories. She is a Fellow of the IEEE, has received numerous other awards and honors, and is the author of over 150 technical papers in the field of wireless communications. Wireless technology is a truly revolutionary paradigm shift, enabling multimedia communications between people and devices from any location. It also underpins exciting applications such as sensor networks, smart homes, telemedicine, and automated highways. This book provides a comprehensive introduction to the underlying theory, design techniques and analytical tools of wireless communications, focusing primarily on the core principles of wireless system design. The book begins with an overview of wireless systems and standards. The characteristics of the wireless channel are then described, including their fundamental capacity limits. Various modulation, coding, and signal processing schemes are then discussed in detail, including state-of-the-art adaptive modulation, multicarrier, spread spectrum, and multiple antenna techniques. The concluding chapters deal with multiuser communications, cellular system design, and ad-hoc network design. Design insights and tradeoffs are emphasized throughout the book. It contains many worked examples, over 200 figures, almost 300 homework exercises, over 700 references, and is an ideal textbook for students. The book is also a valuable reference for engineers in the wireless industry. Wireless Communications Andrea Goldsmith (08 August 2005) 2007-11-03T16:06:03-00:00 2005 Cambridge University Press mimo model network ofdm performance phy propagation wireless