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Interference Analysis Of A Multihop Packet Radio Network Employing Direct Sequence Spread Spectrum Signaling
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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:
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 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 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 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 Electrical & Electronics Abstracts by :
Download or read book Electrical & Electronics Abstracts written by and published by . This book was released on 1997 with total page 1948 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Poetry from Bombay by : Jagdish Shivpuri
Download or read book Poetry from Bombay written by Jagdish Shivpuri and published by . This book was released on 1977 with total page 38 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 Performance of Cellular Frequency-Hopped Spread-Spectrum Radio Networks by : Jeffrey W. Gluck
Download or read book Performance of Cellular Frequency-Hopped Spread-Spectrum Radio Networks written by Jeffrey W. Gluck and published by . This book was released on 1989 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Multiple access interference is characterized for cellular mobile networks, in which users are assumed to be Poisson-distributed in the plane and employ frequency-hopped spread-spectrum signaling with transmitter-oriented assignment of frequency-hopping patterns. Exact expressions for the bit error probabilities are derived for binary coherently demodulated systems without coding. Approximations for the packet error probability are derived for coherent and noncoherent systems and these approximations are applied when forward-error-control coding is employed. In all cases, the effects of varying interference power are accurately taken into account according to some propagation law. Numerical results are given in terms of bit error probability for the exact case and throughput for the approximate analyses. Comparisons are made with previously derived bounds and it is shown that these tend to be very pessimistic. Keywords: Communications network; Multiple access; Frequency hopping; Spread spectrum; Error control coding. (jhd).
Book Synopsis International Aerospace Abstracts by :
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1990 with total page 734 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Performance Analysis of Multihop Packet Radio Networks Under Slotted Frequency Hopping Access Scheme by : Hahan Rahardjo
Download or read book Performance Analysis of Multihop Packet Radio Networks Under Slotted Frequency Hopping Access Scheme written by Hahan Rahardjo and published by . This book was released on 1987 with total page 152 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Documentation Abstracts written by and published by . This book was released on 1987 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Analysis and Design of Multihop Packet Radio Networks Using a CDMA Protocol by : Mon-Song Chen
Download or read book Analysis and Design of Multihop Packet Radio Networks Using a CDMA Protocol written by Mon-Song Chen and published by . This book was released on 1985 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1989 with total page 1134 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Conference Record written by and published by . This book was released on 1988 with total page 382 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Probability of Capture and Rejection of Primary Multiple-Access Interference in Spread-Spectrum Networks by :
Download or read book Probability of Capture and Rejection of Primary Multiple-Access Interference in Spread-Spectrum Networks written by and published by . This book was released on 1987 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: The probability of capture is evaluated for the situation in which several transmitters use the same spread-spectrum code to contend for the attention of a single receiver. The first stage in the capture mechanism is that of acquisition of capture; randomization of the arrival time has been proposed by Davis and Cronemayer to provide delay capture and the probability of this occurrence has been derived. We are concerned with the second stage, that of retaining capture in the presence of interference from the contending users. The probability of retaining capture is computed via accurate approximations and upper bounds for direct-sequence, frequency-hopped and hybrid spread- spectrum signaling formats and for different data modulation and demodulation schemes. The calculation of the overall probability of capture is carried out for spread-spectrum systems with and without forward-error-control; in the latter case Reed-Solomon codes, as well as binary convolutional codes, are considered. Finally, the capability of rejecting primary multiple-access interference in spread-spectrum radio networks is examined by computing the maximum number of users which can contend for the same receiver without causing the probability of capture to fall below some desirable level.
