Download or read book Packet Error Probabilities in Frequency Hopped Spread Spectrum Packet Radio Networks Markov Frequency Hopping Patterns Considered written by M. Georgiopoulos and published by . This book was released on 1987 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: We compute the packet error probability induced in a frequency-hopped spread spectrum packet radio network, which utilizes first order Markov frequency hopping patterns. The frequency spectrum is divided into q frequency bins and the packets are divided into M bytes each. Every user in the network sends each of the M bytes of his packet at a frequency bin, which is different from the frequency bin used by the previous byte, but equally likely to be any one of the remaining q-1 frequency bins (Markov frequency hopping patterns). Furthermore, different users in the network utilize statistically independent frequency hopping patterns. Provided that, K users have simultaneously transmitted their packets on the channel, and a receiver has locked on to one of these K packets, we present a method for the computation of P sub e (K) (i.e. the probability that this packet is incorrectly decoded). Furthermore, we present numerical results (i.e. P sub e (K) versus K) for various values of the multiple access interference K, when Reed Solomon (RS) codes are used for the encoding of packets. Finally, some useful comparisons, with the packet error probability induced, if we assume that the byte errors are independent, are made; based on these comparisons, we can easily evaluate the performance of our spread spectrum system.
Download or read book Packet error probabilities in frequency hopped spread spectrum packet radio networks Markos frequency hopping patterns considered written by M. Georgiopoulos and published by . This book was released on 1987 with total page 58 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1988 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Technical Reports Awareness Circular TRAC written by and published by . This book was released on 1988 with total page 492 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1989 with total page 576 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings of the 26th IEEE Conference on Decision and Control written by and published by . This book was released on 1987 with total page 930 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Government Reports Annual Index written by and published by . This book was released on 1988 with total page 1084 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Probability of Multiple Correct Packet Receptions in a Multireceiver Frequency Hopped Spread Spectrum System written by and published by . This book was released on 1991 with total page 49 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this report we develop exact expressions and approximations for the probability of exactly l correct packet receptions in a group of m receivers, given that k packets are transmitted simultaneously from users employing frequency-hopping spread-spectrum (FH/SS) and Reed-Solomon (RS) coding. This quantity is essential for the design and performance evaluation of multiple-access protocols in spread-spectrum packet radio networks. The evaluations are carried out for MFSK modulation with noncoherent demodulation and various types of RS minimum-distance decoding with erasures and/or errors decoding. Packet synchronous FH/SSMA systems that are hop-synchronous or hop- asynchronous are considered. The exact expressions developed have computational complexity that grows exponentially with m, thus making their evaluation for large m prohibitive. In light of such difficulties, two approximations are considered: one based on Gaussian multivariate distributions with linear computational requirements in m and k, and another based on the assumption of independent receiver operation (IROA), which has minimum computational complexity. Extensive comparisons of the approximations with the exact results establish their validity over different ranges of the system parameters. (Author).
Download or read book Electrical Electronics Abstracts written by and published by . This book was released on 1997 with total page 2304 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Engineering Index Annual written by and published by . This book was released on 1994 with total page 2398 pages. Available in PDF, EPUB and Kindle. Book excerpt: Since its creation in 1884, Engineering Index has covered virtually every major engineering innovation from around the world. It serves as the historical record of virtually every major engineering innovation of the 20th century. Recent content is a vital resource for current awareness, new production information, technological forecasting and competitive intelligence. The world?s most comprehensive interdisciplinary engineering database, Engineering Index contains over 10.7 million records. Each year, over 500,000 new abstracts are added from over 5,000 scholarly journals, trade magazines, and conference proceedings. Coverage spans over 175 engineering disciplines from over 80 countries. Updated weekly.
Download or read book Proceedings of the Conference on Information Sciences and Systems written by and published by . This book was released on 1989 with total page 770 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Index to IEEE Publications written by Institute of Electrical and Electronics Engineers and published by . This book was released on 1989 with total page 944 pages. Available in PDF, EPUB and Kindle. Book excerpt: Issues for 1973- cover the entire IEEE technical literature.
Download or read book Government Reports Annual Index Keyword A L written by and published by . This book was released on 1988 with total page 1600 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Summary of Engineering Research written by University of Illinois at Urbana-Champaign. Office of Engineering Publications and published by . This book was released on 1983 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1988 with total page 840 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Packet Error Probability Analysis for Unslotted FH CDMA Frequency Hopped Code Division Multiple Access Systems with Error Control Coding written by and published by . This book was released on 1989 with total page 19 pages. Available in PDF, EPUB and Kindle. Book excerpt: In unslotted frequency-hopped (FH) code-division multiple-access (CDMA) systems, a number of users can simultaneously transmit their packets by using quasi-orthogonal FH patterns (codes). The number of interfering users varies throughout the packet duration; thus, the symbol error probability is not constant throughout the transmission, and symbol errors with the packet are not independent. In this report we present an exact analysis of such systems that use Reed-Solomon error-control coding. The computational task for the evaluation of the performance is enormous; thus, bounds and approximations are derived that are easier to compute and that prove to be very close to the exact results for the cases in which the exact results are computable. The results of this study confirm our observation, made also elsewhere, that the widely used threshold- based model of other-user interference is not an accurate one.
