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On The Use Of Multiuser Detectors In An Ad Hoc Multihop Packet Radio Network Employing Direct Sequence Spread Spectrum Signaling
Download On The Use Of Multiuser Detectors In An Ad Hoc Multihop Packet Radio Network Employing Direct Sequence Spread Spectrum Signaling full books in PDF, epub, and Kindle. Read online On The Use Of Multiuser Detectors In An Ad Hoc Multihop Packet Radio Network Employing Direct Sequence Spread Spectrum Signaling ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis On the Use of Multiuser Detectors in an Ad Hoc Multihop Packet Radio Network Employing Direct-sequence Spread-spectrum Signaling by : Peijin Zhou
Download or read book On the Use of Multiuser Detectors in an Ad Hoc Multihop Packet Radio Network Employing Direct-sequence Spread-spectrum Signaling written by Peijin Zhou and published by . This book was released on 2004 with total page 204 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this thesis, we study the performance of multiuser detectors within an ad hoc multihop packet radio network. The network is modeled using an approach similar to that employed by Sousa and Silvester and Wang and O'Leary. Direct-sequence spread-spectrum multiple access signaling is assumed. The performance of the minimum mean square error multiuser detector is contrasted with that of the conventional single user matched filter detector. Then, we use these results to assess the overall performance of the ad hoc multihop packet radio network.
Book Synopsis Interference Analysis of a Multihop Packet Radio Network Employing Direct-sequence Spread-spectrum Signaling by : Fang Wang
Download or read book Interference Analysis of a Multihop Packet Radio Network Employing Direct-sequence Spread-spectrum Signaling written by Fang Wang and published by . This book was released on 2002 with total page 192 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book 2001 MILCOM written by and published by . This book was released on 2001 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Expected Forward Progress and Throughput of Multi-Hop Frequency-Hopped Spread-Spectrum Networks by :
Download or read book Expected Forward Progress and Throughput of Multi-Hop Frequency-Hopped Spread-Spectrum Networks written by and published by . This book was released on 1987 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: Secondary multiple-access interference processes are characterized for multi-hop packet radio networks in which users are assumed to be Poisson-distributed in the plane and to use frequency-hopped spread-spectrum signaling with a receiver-oriented assign- ment of frequency-hopping patterns. The throughput per node and the average forward progress are then evaluated for frequency-hopped multi-hop networks which employ (i) random forward routing with fixed transmission radius (RFR) and (ii) most forward pro- gress routing with fixed transmission radius (MF%R). The optimal average number of neighbors and transmission radius are derived for these cases when Reed-Solomon forward-error-control coding with minimum distance decoding or binary convolutional coding with Viterbi decoding is employed.
Book Synopsis Acquisition Techniques for Direct Sequence Spread Spectrum Packet Radio Systems by : Zhen-liang Shi
Download or read book Acquisition Techniques for Direct Sequence Spread Spectrum Packet Radio Systems written by Zhen-liang Shi and published by . This book was released on 1993 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Evaluation of Frequency-Hopped Spread Spectrum Multi-Hop Networks by : J. W. Gluck
Download or read book Performance Evaluation of Frequency-Hopped Spread Spectrum Multi-Hop Networks written by J. W. Gluck and published by . This book was released on 1988 with total page 55 pages. Available in PDF, EPUB and Kindle. Book excerpt: Primary and secondary multiple-access interference processes are characterized for multi-hop packet radio networks, in which users are assumed to be Poisson-distributed in the plane and to use frequency hopped spread-spectrum signaling with a receiver-oriented assignment of frequency-hopping patterns. The throughput per node and the average forward progress are then evaluated for frequency-hopped multi-hop networks that employ (i) random forward routing with fixed transmission radius (RFR) and(ii) most forward progress routing with fixed transmission radius (MFR). The optimal average number of neighbors and transmission radius are derived for these cases when Reed-Solomon forward-error-control coding with minimum distance decoding or binary convolutional coding with Viterbi decoding is employed.
Book Synopsis A Random Access Algorithm for Direct Sequence Spread-Spectrum Packet Radio Networks by : Michael Georgiopoulos
Download or read book A Random Access Algorithm for Direct Sequence Spread-Spectrum Packet Radio Networks written by Michael Georgiopoulos and published by . This book was released on 1986 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: We propose and analyze a limited sensing random access algorithm, named CRADS, for a multi-user and multi-receiver direct sequence spread spectrum system. Utilizing the regenerative character of the induced by the algorithm output process, we compute throughputs subject to an upper bound on the probability of erroneous data decoding; we also compute the expected per packet delays. The CRADS induces uniformly good delays within its stability region, an is particularly appropriate for environments where the users are highly mobile. (Author).
Book Synopsis An Adaptive Transmission Protocol for Direct Sequence Spread Spectrum Packet Radio Networks by : Karthik Gajaraj
Download or read book An Adaptive Transmission Protocol for Direct Sequence Spread Spectrum Packet Radio Networks written by Karthik Gajaraj and published by . This book was released on 2004 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Use of Side Information in Adaptive Protocols for Spread-Spectrum Packet Radio Networks by :
Download or read book Use of Side Information in Adaptive Protocols for Spread-Spectrum Packet Radio Networks written by and published by . This book was released on 1995 with total page 6 pages. Available in PDF, EPUB and Kindle. Book excerpt: A summary of the results obtained in research sponsored by the Army Research Office under contract DAALO3-92-c-0018 and conducted during the period July 1, 1992 to August 31, 1995 is presented. Reliable data distribution within spread spectrum packet radio networks requires high performance from the network protocols. The high variability of the qualities of the links and the unique characteristics of frequency hop spread spectrum signaling impose special requirements for network protocols that are to be employed in frequency hop packet radio networks. Side information that can be extracted from the received spread spectrum signals that are embedded in noise and interference provides information about the quality of the links in the packet radio network. This research investigated several techniques for utilizing side information to aid the network protocols in establishing reliable routes in a mobile, tactical packet radio network.
Book Synopsis Decentralized Channel Management in Scalable Multihop Spread- Spectrum Packet Radio Networks by : Timothy Jason Shepard
Download or read book Decentralized Channel Management in Scalable Multihop Spread- Spectrum Packet Radio Networks written by Timothy Jason Shepard and published by . This book was released on 1995 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: "This thesis addresses the problems of managing the transmissions of stations in a spread-spectrum packet radio network so that the system can remain effective when scaled to millions of nodes concentrated in a metropolitan area. The principal difficulty in scaling a system of packet radio stations is interference from other stations in the system. Interference comes both from nearby stations and from distant stations. Each nearby interfering station is a particular problem, because a signal received from it may be as strong as or stronger than the desired signal from some other station. Far-off interfering stations are not individually a problem, since each of their signals will be weaker, but the combined effect may be the dominant source of interference. The thesis begins with an analysis of propagation and interference models. The overall noise level in the system (mainly caused by the many distant stations) is then analyzed, and found to remain manageable even as the system scales to billions of nodes. A scheme for designing a scalable packet radio network is then presented. Included is a method of scheduling packet transmissions to avoid collisions (caused by interference from nearby stations) without the need for global coordination or synchronization. Simulations of a system of one thousand stations are used to verify and illustrate the methods used. A method of choosing routes (minimum-energy routes) is demonstrated in simulation to produce a fully connected and functional network for one hundred and one thousand randomly placed stations. Unfortunately, congestion as the system scales is unavoidable if the traffic is not limited to some degree of locality. If traffic is limited to a few hops, then for a large system the techniques presented in this thesis are superior to ideal time division multiplexing of a clear channel."
Book Synopsis The Evolution of Untethered Communications by : National Research Council
Download or read book The Evolution of Untethered Communications written by National Research Council and published by National Academies Press. This book was released on 1998-01-01 with total page 208 pages. Available in PDF, EPUB and Kindle. Book excerpt: In response to a request from the Defense Advanced Research Projects Agency, the committee studied a range of issues to help identify what strategies the Department of Defense might follow to meet its need for flexible, rapidly deployable communications systems. Taking into account the military's particular requirements for security, interoperability, and other capabilities as well as the extent to which commercial technology development can be expected to support these and related needs, the book recommends systems and component research as well as organizational changes to help the DOD field state-of-the-art, cost-effective untethered communications systems. In addition to advising DARPA on where its investment in information technology for mobile wireless communications systems can have the greatest impact, the book explores the evolution of wireless technology, the often fruitful synergy between commercial and military research and development efforts, and the technical challenges still to be overcome in making the dream of "anytime, anywhere" communications a reality.
Book Synopsis Direct-sequence Spread-spectrum Packet Radio Performance by : Dana John Taipale
Download or read book Direct-sequence Spread-spectrum Packet Radio Performance written by Dana John Taipale and published by . This book was released on 1984 with total page 178 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Transmission Range Optimisation of a Spread Spectrum Multihop Packet Radio Network in the Presence of Fading by : J. M. Challinor
Download or read book Transmission Range Optimisation of a Spread Spectrum Multihop Packet Radio Network in the Presence of Fading written by J. M. Challinor and published by . This book was released on 1994 with total page 184 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Bit-to-Bit Error Dependence in Direct-Sequence Spread-Spectrum Multiple-Access Packet Radio Systems by : Robert K Morrow (Jr)
Download or read book Bit-to-Bit Error Dependence in Direct-Sequence Spread-Spectrum Multiple-Access Packet Radio Systems written by Robert K Morrow (Jr) and published by . This book was released on 1988 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt: Slotted direct-sequence spread-spectrum multiple-access (DS/SSMA) packet broadcasting systems with random signature sequences are analyzed within the framework of the lower three layers of the International Standards Organization Reference Model of Open Systems Interconnection. At the physical layer, we show that a widely-used Gaussian approximation (which we call the Standard Gaussian Approximation) for the probability of data bit error in a chip and phase asynchronous system is accurate only when there are a large number of simultaneous users on the channel; otherwise, this approximation can be optimistic by several orders of magnitude. For interfering signals with fixed delays and phases relative to the desired signal, however, the Standard Gaussian Approximation is quite accurate for any number of simultaneous users. To obtain a closer approximation to the probability of data bit error for an asynchronous system, we introduce the Improved Gaussian Approximation, which involves finding the distribution of the multiple-access interference variance over all possible delay and phase values and then taking a Gaussian approximation over the support of the distribution and averaging the results. To accurately analyze packet performance at the data link layer, we first use the theory of moment spaces to gain insight on the effect of bit-to-bit error dependence caused by the constant relative delays and (possibly) phases of the interfering signals over the duration of a desired packet. (rh).
Book Synopsis Decentralization Channel Management in Scalable Multihop Spread-spectrum Packet Radio Networks by : Timothy Jason Shepard
Download or read book Decentralization Channel Management in Scalable Multihop Spread-spectrum Packet Radio Networks written by Timothy Jason Shepard and published by . This book was released on 1995 with total page 81 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Dissertation Abstracts International by :
Download or read book Dissertation Abstracts International written by and published by . This book was released on 2003 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Interference in Large Wireless Networks by : Martin Haenggi
Download or read book Interference in Large Wireless Networks written by Martin Haenggi and published by Now Publishers Inc. This book was released on 2009 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since interference is the main performance-limiting factor in most wireless networks, it is crucial to characterize the interference statistics. The main two determinants of the interference are the network geometry (spatial distribution of concurrently transmitting nodes) and the path loss law (signal attenuation with distance). For certain classes of node distributions, most notably Poisson point processes, and attenuation laws, closed-form results are available, for both the interference itself as well as the signal-to-interference ratios, which determine the network performance. This monograph presents an overview of these results and gives an introduction to the analytical techniques used in their derivation. The node distribution models range from lattices to homogeneous and clustered Poisson models to general motion-invariant ones. The analysis of the more general models requires the use of Palm theory, in particular conditional probability generating functionals, which are briefly introduced in the appendix.
