Performance Analysis of Fast Frequency-hopped DBPSK Spread Spectrum Communication System PDF Download
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Author: Chingshyang Lo
Publisher:
ISBN:
Category :
Languages : en
Pages : 290
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Author: Chingshyang Lo
Publisher:
ISBN:
Category :
Languages : en
Pages : 290
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Author: Ming-li Shen
Publisher:
ISBN:
Category :
Languages : en
Pages : 134
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Author: E. A. Geraniotis
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ISBN:
Category :
Languages : en
Pages : 7
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Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 119
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This thesis focuses on the performance analysis of hybrid direct sequence/slow frequency hopping (DS/SFH) and hybrid direct sequence/fast frequency hopping (DS/FFH) systems under multi-user interference and Rayleigh fading. First, we analyze the performance of direct sequence spread spectrum (DSSS), slow frequency hopping (SFH) and fast frequency hopping (FFH) systems for varying processing gains under interference environment assuming equal bandwidth constraint with Binary Phase Shift Keying (BPSK) modulation and synchronous system. After thorough literature survey, we show that hybrid DS/FFH systems outperform both SFH and hybrid DS/SFH systems under Rayleigh fading and multi-user interference. Also, both hybrid DS/SFH and hybrid DS/FFH show performance improvement with increasing spreading factor and decreasing number of hopping frequencies.
Author: Giovanni Cherubini
Publisher:
ISBN:
Category : Frequency stability
Languages : en
Pages : 224
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Author: Khalid Ali Qaraq'e
Publisher:
ISBN:
Category :
Languages : en
Pages : 218
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Author: Sang K. Park
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ISBN:
Category :
Languages : en
Pages : 139
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Author: Ibrahim Ghareeb
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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: Robert Ward White
Publisher:
ISBN:
Category :
Languages : en
Pages : 224
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Author: SANG KYU PARK
Publisher:
ISBN:
Category :
Languages : en
Pages : 157
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strategies we consider allow the jammer to pulse between several power values subject to an average power constraint.
