Title :
A performance review of PSP for joint phase/frequency and data estimation in future broadband satellite networks
Author :
Vanelli-Coralli, Alessandro ; Salmi, Paola ; Cioni, Stefano ; Corazza, Giovanni Emanuele ; Polydoros, Andreas
Author_Institution :
Dept. of Electronics, Comput. Sci. & Syst., Bologna Univ., Italy
fDate :
12/1/2001 12:00:00 AM
Abstract :
In unknown channels, nonadaptive maximum likelihood sequence detection (NA-MLSD) is far from optimum in the presence of channel-induced uncertainty. To counteract this uncertainty, conventional solutions augment MLSD with external channel estimators. However, for very low SNR values this estimation procedure becomes marginal and the conventional adaptive MLSD (CA-MLSD) approaches perform poorly. We consider joint data decoding and parameter estimation techniques, and in particular per survivor processing (PSP) techniques, as a potentially effective solutions to this problem, at the expense of increased complexity. The performance/complexity tradeoff is addressed for a convolutionally encoded Q-PSK return link of an SHF/EHF satellite system for multimedia services impaired by phase noise and frequency offsets. By contrasting NA-MLSD, CA-MLSD, and PSP, ranges are provided for channel conditions where the tradeoff favors a particular technique. Further, CA-MLSD and PSP are also contrasted in terms of scalar/ vector estimation performance
Keywords :
Viterbi detection; adaptive decoding; adaptive signal detection; broadband networks; computational complexity; convolutional codes; decoding; frequency estimation; maximum likelihood sequence estimation; modulation coding; multimedia communication; phase estimation; phase noise; quadrature phase shift keying; satellite links; signal processing; CA-MLSD; NA-MLSD; PSP; SHF/EHF satellite system; SNR; Viterbi detection; adaptive MLSD; adaptive decoding; broadband satellite networks; channel-induced uncertainty; conventional adaptive MLSD; convolutionally encoded Q-PSK return link; data estimation; external channel estimators; joint data decoding; joint phase/frequency estimation; multimedia services; nonadaptive maximum likelihood sequence detection; parameter estimation; per survivor processing; performance/complexity tradeoff; scalar/vector estimation performance; AWGN; Convolution; Frequency estimation; Maximum likelihood decoding; Maximum likelihood detection; Parameter estimation; Phase detection; Phase estimation; Phase frequency detector; Uncertainty;
Journal_Title :
Selected Areas in Communications, IEEE Journal on