Performance Analysis Of Frequency Hopped Spread Spectrum Multiple Access Fh Ssma Communication Systems
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Performance Analysis Of Frequency Hopped Spread Spectrum Multiple Access Fh Ssma Communication Systems
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Author : Khalid Ali Qaraq'e
language : en
Publisher:
Release Date : 1997
Performance Analysis Of Frequency Hopped Spread Spectrum Multiple Access Fh Ssma Communication Systems written by Khalid Ali Qaraq'e 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 Study Of Modified Frequency Hopping Spread Spectrum Multiple Access Packet Communication Systems
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Author : Ki Jong Hong
language : en
Publisher:
Release Date : 1982
Performance Study Of Modified Frequency Hopping Spread Spectrum Multiple Access Packet Communication Systems written by Ki Jong Hong and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1982 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.
Performance Analysis For A New Model Of The Fast Frequency Hopped Code Division Multiple Access Spread Spectrum Communication System
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Author : Ming-li Shen
language : en
Publisher:
Release Date : 1993
Performance Analysis For A New Model Of The Fast Frequency Hopped Code Division Multiple Access Spread Spectrum Communication System written by Ming-li Shen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with categories.
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).
Performance Analysis Of Frequency Hopped Spread Spectrum Communication Systems With Worst Case Jamming Interference
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Author : SANG KYU PARK
language : en
Publisher:
Release Date : 1987
Performance Analysis Of Frequency Hopped Spread Spectrum Communication Systems With Worst Case Jamming Interference written by SANG KYU PARK and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1987 with categories.
strategies we consider allow the jammer to pulse between several power values subject to an average power constraint.
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.
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.
Performance Analysis Of Direct Sequence Spread Spectrum Multiple Access Communication Via Fading Channels
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Author : David Edward Borth
language : en
Publisher:
Release Date : 1979
Performance Analysis Of Direct Sequence Spread Spectrum Multiple Access Communication Via Fading Channels written by David Edward Borth and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1979 with categories.
The performance of biphase direct-sequence spread-spectrum multiple-access (SSMA) communication for a general class of fading channels is investigated. The channels considered are those for which the channel output consists of a strong stable specular signal plus a faded version of this signal. Such channels are the result of a transmission medium which gives rise to a major stable communication path and a number of additional weaker communication paths. The fading channel is modeled as a general is modeled as a general wide-sense-stationary uncorrelated-scattering (WSSUS) channel -- a model which is general enough to exhibit both time and frequency selectivity and to impose no restrictions on the fading rate. A discussion of the important parameters of the WSSUS channel is given and two important classes of WSSUS channels are developed from the general fading channel model; time-selective fading channels and frequency-selective fading channels. In analyzing the performance of direct-sequence SSMA communications via fading channels two measures of system performance that are considered are average signal-to-noise ratio at the receiver output and the average probability of error. (Author).
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.