Multiple Access Capability Of Frequency Hopped Spread Spectrum Revisited An Exact Analysis Of The Effect Of Unequal Power Levels
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Multiple Access Capability Of Frequency Hopped Spread Spectrum Revisited An Exact Analysis Of The Effect Of Unequal Power Levels
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Author :
language : en
Publisher:
Release Date : 1988
Multiple Access Capability Of Frequency Hopped Spread Spectrum Revisited An Exact Analysis Of The Effect Of Unequal Power Levels written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
In this paper we present a new method for the evaluation of the probability of error of uncoded frequency-hopped spread-spectrum multiple-access (FH/SSMA) communications. For systems with binary FSK modulation the method provides an accurate approximation and a tight upper bound to the bit error probability; for systems with M-ary FSK modulation it provides tight upper bounds to the symbol error probability. This method relies on the integration of the product of the characteristic function of the envelope of the branch of the BFSK demodulator, which carries the desired signal, and of the derivative of the characteristic function of the envelope of the other branch; it can achieve any desirable accuracy and the computational effort required for its evaluation grows linearly with the number of interfering users. In the M-ary case tight upper bounds based on the union bound and the results of the binary case are derived.
Frequency Hopped Spread Spectrum Systems Have A Larger Multiple Access Capability The Effect Of Interfering Signals With Unequal Power Levels
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Author : Evaggelos Geraniotis
language : en
Publisher:
Release Date : 1988
Frequency Hopped Spread Spectrum Systems Have A Larger Multiple Access Capability The Effect Of Interfering Signals With Unequal Power Levels written by Evaggelos Geraniotis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with categories.
In this report we present a new method for the evaluation of the probability of error of uncoded frequency-hopped spread-spectrum multiple-access (FH/SSMA) communications. For systems with binary FSK modulation, the method provides an accurate approximation and a tight upper bound to the bit error probability; for systems with M -ary FSK modulation, it provides tight upper bounds to the symbol error probability. This method relies on the integration of the product of the characteristic function of the envelope of the branch of the BFSK demodulator, which carries the desired signal, and of the derivative of the characteristic function of the envelope of the other branch; it can achieve any desirable accuracy and the computational effort required for its evaluation grows linearly with the number of interfering users. In the M -ary case, tight upper bounds based on the union bound and the results of the binary case are derived. Keywords: Frequency hopping, Spread spectrum, Multiple access, and Error control coding. (RH).
Proceedings Of The Conference On Information Sciences And Systems
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Author :
language : en
Publisher:
Release Date : 1988
Proceedings Of The Conference On Information Sciences And Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1988 with Electrical engineering categories.
Wireless Applications Of Spread Spectrum Systems
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Author : Sawasd Tantaratana
language : en
Publisher: Institute of Electrical & Electronics Engineers(IEEE)
Release Date : 1998
Wireless Applications Of Spread Spectrum Systems written by Sawasd Tantaratana and has been published by Institute of Electrical & Electronics Engineers(IEEE) this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Cell phones categories.
These selected readings bring together introductory and advanced papers on various wireless applications of spread spectrum technology. The papers are grouped into sections according to the application areas: spread-spectrum technology, cellular mobile systems, satellite communications, wireless local area networks, and the global positioning system (GPS).
Performance Of Cellular Frequency Hopped Spread Spectrum Radio Networks
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Author : Jeffrey W. Gluck
language : en
Publisher:
Release Date : 1989
Performance Of Cellular Frequency Hopped Spread Spectrum Radio Networks written by Jeffrey W. Gluck and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989 with categories.
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).
Analysis Of Binary Frequency Hopped Spread Spectrum Multiple Access Communications Systems
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Author : Evaggelos A. Geraniotis
language : en
Publisher:
Release Date : 1980
Analysis Of Binary Frequency Hopped Spread Spectrum Multiple Access Communications Systems written by Evaggelos A. Geraniotis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with categories.
Spread Spectrum Communications Handbook Electronic Edition
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Author : Marvin K. Simon
language : en
Publisher: McGraw Hill Professional
Release Date : 2001-09-22
Spread Spectrum Communications Handbook Electronic Edition written by Marvin K. Simon and has been published by McGraw Hill Professional this book supported file pdf, txt, epub, kindle and other format this book has been release on 2001-09-22 with Technology & Engineering categories.
The acknowledged Spread-Spectrum Bible the most complete reference in the field! INCLUDESCD-ROM CONTAININGTHE ENTIRE BOOKIN FULLY-SEARCHABLE PDF Spread-spectrum systems have found important commercial applications in CDMA cellular networks and wireless personal communication networks. Communications engineers and technicians now have ready access to a wealth of spread-spectrum information in this exhaustive handbook the most comprehensive and authoritative compendium on spread-spectrum systems available anywhere. Written by recognized authorities in the field, the Handbook presents both theoretical basics and practical applications, providing succinct, results-oriented solutions to engineering problems. Starting with basic concepts and system models, the book covers: Anti-jamming communication systems Coherent direct-sequence systems Non-coherent frequency-hopped systems Coherent and differentially coherent modulation techniques Pseudonoise acquistion and tracking in direct sequence receivers Time and frequency synchronization of frequency-hopped receivers Low probability of intercept communications In addition, it offers an in-depth look at multiple access communications and positioning systems and discusses the growth of spread-spectrum applications. INCLUDES CD-ROM CONTAINING THE ENTIRE BOOK IN FULLY SEARCHABLE PDF
Performance Analyses Of Frequency Hopped Spread Spectrum Multiple Access Systems In Fading Environments
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Author : Usa Svasti-Xuto
language : en
Publisher:
Release Date : 1996
Performance Analyses Of Frequency Hopped Spread Spectrum Multiple Access Systems In Fading Environments written by Usa Svasti-Xuto and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1996 with categories.
The focus of this dissertation is the performance analyses of two classes of frequency-hopped spread-spectrum multiple access (FH-SSMA) systems in various fading environments. The capacity of Viterbi's FH-SSMA system is evaluated under three types of fading, namely Rician, shadowed Rician, and Nakagami fading. The results of recent experiments have indicated that these fading phenomena occur in various environments where the FH-SSMA system may be implemented. In this dissertation, the deletion probability for each fading scenario is derived. Subsequently, the system capacity is analyzed in terms of maximum number of users versus average bit error rate. The effect of a change in the signal-to-noise ratio level on the system capacity is also demonstrated. For Rician fading, it is found that the capacity of the system with a Rician factor of 2 dBis reduced by 13 percent as compared to the capacity of the non-fading case. For shadowed Rician fading, three shadowing scenarios are considered: light, average, and heavy. It is shown that the light and the average shadowing scenarios provide only a slight decrease in the capacity, while the heavy shadowing scenario renders a capacity identical to that for the Rayleigh fading case. Finally, for Nakagami fading the capacity is found to decrease by 50 percent as the fading parameter is reduced to 0.5. The performance of a cellular frequency-hopped spread-spectrum multiple access system is studied under an indoor environment. It is demonstrated how the system capacity, given in terms of the number of users per cell, is affected by the number of cells in the system. Also, the influence of the delay spread, which is the result of multipath propagation, is investigated. The analysis focuses on a worst-case scenario where a user receives both the desired and interfering signals with equal power levels. This scenario applies to both the downlink and the uplink. It is shown that the system capacity is reduced drastically as the number of adjacent interfering cells increases from one to three. Previous work concerning the indoor multipath propagation assumed that the number of paths is fixed, the path delays are uniformly distributed, and the path gains are equal. In this dissertation, a more realistic channel model derived from actual impulse response measurements by Saleh and Valenzuela is employed. The model consists of clusters of rays with constant cluster and ray arrival rates and power-delay time constants. The system performance is shown to be affected strongly by the change in the power-delaytime constants, yet only slightly influenced by the variation in the arrival rates of the rays and clusters. In addition, the degradation in the system performance due to the delay spread becomes more severe as the transmission rate increases.
Performance Analyses Of Frequency Hopped Spread Spectrum Multiple Access Systems In Fading Environments
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Author :
language : en
Publisher:
Release Date : 1997
Performance Analyses Of Frequency Hopped Spread Spectrum Multiple Access Systems In Fading Environments written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
Performance Analysis For Fast Frequency Hopped Spread Spectrum Multiple Access Communications
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Author : E. A. Geraniotis
language : en
Publisher:
Release Date : 1981
Performance Analysis For Fast Frequency Hopped Spread Spectrum Multiple Access Communications written by E. A. Geraniotis and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.