The paper analyzes possible transmission schemes for satellite personal communication systems adopting Low/ Medium-Earth orbit (LEO/MEO) constellations and DirectSequence Code Division Multiple Access (DS-CDMA) in the presence of fading and shadowing, the statistics of which are functions of the satellite elevation angle. In particular, the performance of M-ary Walsh-Hadamard orthogonal (MWHO) convolutionally coded DS-CDMA over a Rice-log-normal fading channel is analyzed in depth, and compared to the simpler coded differential BPSK (DBPSK) scheme. Optimization of the performance/complexity tradeoff in the metric computation for soft inputs to the Viterbi decoder is addressed. Upper bounds on the error probability without or with satellite diversity and equal gain combining are evaluated considering different coding rates. The effect of correlated fading is also taken into account via simulation. Among the various results, it is shown that the optimal coding rate is a function of the satellite elevation angle and of the diversity order, that the loss for using DBPSK instead of MWHO is in the range 1-1.4 dB, and that interleaving depth is a critical parameter.

Corazza, G.E. (1998). Analysis of coded noncoherent transmission in DS-CDMA mobile satellite communications. IEEE TRANSACTIONS ON COMMUNICATIONS, 46(11), 1525-1535.

Analysis of coded noncoherent transmission in DS-CDMA mobile satellite communications

CORAZZA, GIOVANNI EMANUELE
1998

Abstract

The paper analyzes possible transmission schemes for satellite personal communication systems adopting Low/ Medium-Earth orbit (LEO/MEO) constellations and DirectSequence Code Division Multiple Access (DS-CDMA) in the presence of fading and shadowing, the statistics of which are functions of the satellite elevation angle. In particular, the performance of M-ary Walsh-Hadamard orthogonal (MWHO) convolutionally coded DS-CDMA over a Rice-log-normal fading channel is analyzed in depth, and compared to the simpler coded differential BPSK (DBPSK) scheme. Optimization of the performance/complexity tradeoff in the metric computation for soft inputs to the Viterbi decoder is addressed. Upper bounds on the error probability without or with satellite diversity and equal gain combining are evaluated considering different coding rates. The effect of correlated fading is also taken into account via simulation. Among the various results, it is shown that the optimal coding rate is a function of the satellite elevation angle and of the diversity order, that the loss for using DBPSK instead of MWHO is in the range 1-1.4 dB, and that interleaving depth is a critical parameter.
Pubblicato
Rilevanza internazionale
Articolo
Sì, ma tipo non specificato
Settore ING-INF/03 - Telecomunicazioni
English
Con Impact Factor ISI
CDMA; mobile satellite communications; satellite diversity; soft noncoherent detection
Corazza, G.E. (1998). Analysis of coded noncoherent transmission in DS-CDMA mobile satellite communications. IEEE TRANSACTIONS ON COMMUNICATIONS, 46(11), 1525-1535.
Corazza, Ge
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/2108/6327
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