Title :
Differential M-ary orthogonal signaling for DS/CDMA land mobile satellite communications
Author :
Iossifides, Athanassios C. ; Pavlidou, Fotini-Niovi
Author_Institution :
Dept. of Electr. & Comput. Eng., Aristotelian Univ. of Thessaloniki, Greece
fDate :
2/1/1999 12:00:00 AM
Abstract :
In this paper, we derive an analytical framework for the performance evaluation of an M-ary orthogonal scheme based on differential encoding/decoding of the Walsh/Hadamard chips prior/after spreading. This technique makes feasible nonpilot-assisted detection over fast fading environments such as the land mobile satellite (LMS) channel. Our results show that differential M-ary orthogonal signaling presents very good performance at Doppler frequency shifts much higher than the symbol rate. Amplitude statistics are considered to be Rayleigh, but may be easily extended to more general models based on the analytical derivation presented
Keywords :
Doppler shift; Rayleigh channels; Walsh functions; code division multiple access; decoding; encoding; land mobile radio; mobile satellite communication; spread spectrum communication; telecommunication signalling; DS/CDMA land mobile satellite communications; Doppler frequency shifts; Hadamard chips; LMS channel; Rayleigh statistics; Walsh chips; amplitude statistics; differential M-ary orthogonal signaling; differential decoding; fast fading environments; land mobile satellite channel; nonpilot-assisted detection; performance; Decoding; Doppler shift; Frequency; Least squares approximation; Multiaccess communication; Performance analysis; Power system modeling; Rayleigh channels; Satellite communication; Statistical analysis;
Journal_Title :
Selected Areas in Communications, IEEE Journal on
