Performance of Fast Frequency Hopped MFSK Spread Spectrum Communication in the Presence of AWGN and Tone Jamming PDF Download
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Author: Robert Ward White
Publisher:
ISBN:
Category :
Languages : en
Pages : 224
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Author: Robert Ward White
Publisher:
ISBN:
Category :
Languages : en
Pages : 224
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Author:
Publisher:
ISBN:
Category : Military research
Languages : en
Pages : 272
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Author: Kah Chan Teh
Publisher:
ISBN:
Category :
Languages : en
Pages : 179
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Author: Konstantinos Karkatzounis
Publisher:
ISBN: 9781423520146
Category :
Languages : en
Pages : 115
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Book Description
The fast frequency hopping technique is considered one of the most effective Electronic Protective Measures (EPM) for military communications systems in order to mitigate the effect of a follower or repeat jammer. This thesis evaluates the performance of different jamming strategies as barrage noise jamming, partial band jamming and multitone band jamming against an uncoded noncoherent FFH/MFSK system with a conventional receiver. The theoretical and simulated results showed that the best jamming strategies for the examined modulation orders M=2,4,8 is the optimum case of multitone band jamming. As a second goal, this thesis also provides a preliminary analysis for an uncoded noncoherent FFH/MFSK system in a Rayleigh fading channel. This analysis includes the theoretical and simulated results for the influence in the performance from a barrage noise jammer along with AWGN. The results of the theoretical analysis and the simulation modeling for both cases can be used as guidelines to analyze more complicated jamming or combinations of jamming strategies against FFH/MFSK communication system.
Author:
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ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 742
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Author: Ibrahim Ghareeb
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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This thesis studies the performance of joint frequency-phase modulation (JFPM) communication systems, it considers its spread spectrum as well as narrow band applications. JFPM signal has been mathematically modeled. Its power spectral density and bandwidth efficiency have been analyzed. A bit error rate performance of JFPM signals in AWGN as well as in Rayleigh fading channels is obtained. Assuming statistical independence of the diversity channels, we have analyzed the diversity combining reception of JFPM over Rayleigh fading channels. These analytical results show that, JFPM signals are characterized by relative simplicity in obtaining large set of waveforms, and thus by varying its parameters it can be suitable for either bandwidth-limited or power-limited applications. Compared to M-ary FSK signals that use the same number of tones, the needed minimum frequency separation between two adjacent tones for JFPM signals to satisfy the orthogonality condition is reduced. A spread spectrum system referred to as frequency hopped/joint frequency-phase modulation (FH/JFPM) has also been presented. The system model is described for both slow frequency hopping (SFH/JFPM) and fast frequency hopping (FFH/JFPM). Bit error rate performance for SFH/JFPM in the presence of broadband and partial-band noise jamming is analyzed, and the worst case jamming performance of this system is evaluated. It is shown that SFH/JFPM is less sensitive to broadband and partial-band noise jamming than the conventional frequency hopped systems. The design and analysis of the FFH/JFPM system over Rayleigh fading channels is presented. An expression for the probability of a bit error is obtained. Results have shown that the FFH/JFPM outperforms the conventional frequency hopped systems. A detailed analysis for the probability density function of the received signal phase in the presence of multitone jamming is provided. The probability density function is derived for any arbitrary transmitted signal phase. Based on this analysis, the probability of error for the FH/M-ary DPSK system in the presence of multitone jamming is obtained. The performance of coherent frequency hopped M-ary PSK system in multitone jamming environments has also been presented. Bit error rate performance of this system is analyzed. A simple expression for the probability of a bit error is obtained. The performance of this system in worst case jamming is also given.
Author: Marvin K. Simon
Publisher: McGraw Hill Professional
ISBN: 0071395709
Category : Technology & Engineering
Languages : en
Pages : 1250
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Book Description
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
Author:
Publisher:
ISBN:
Category : Dissertation abstracts
Languages : en
Pages : 728
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Author: Jhong S. Lee
Publisher:
ISBN:
Category :
Languages : en
Pages : 191
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Error probability analyses are performed for a coded M-ary frequency-shift-keying (MFSK) system employing L hops per M-ary word frequency-hopping (FH) spread spectrum waveforms transmitted over a partial-band Gaussian noise jamming channel. The information bit error probabilities are obtained for a square-law linear combining demodulator and for a square-law adaptive gain control (AGC) demodulator, both with forward error control (FEC) coding under conditions of worst-case partial-band noise jamming, using exact analyses of the demodulator performance which include both thermal noise and jamming noise. Parametric performance curves are obtained for both block codes and convolutional codes with both binary and M-ary channel modulations. The results show that thermal noise can not be neglected in the analyses if correct determinations of the optimum order of diversity and the worst-case jamming fraction are to be obtained over the whole range of signal-to-thermal noise and signal-to-jamming ratios. It is shown that the combination of non-linear combining, M-ary modulation, and forward error control coding is an effective strategy against worst-case partial-band noise jamming. However, just as was found to be the case for uncoded systems, the linear combiner is ineffective in worst-case partial-band noise jamming. (Author).
Author: Marvin K. Simon
Publisher:
ISBN: 9780881750157
Category : Spread spectrum communications
Languages : en
Pages : 456
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