Title :
Soft-decisions per-survivor processing for mobile fading channels
Author :
Anastasopoulos, Achilleas ; Polydoros, Andreas
Author_Institution :
Dept. of Electr. Eng. Syst., Univ. of Southern California, Los Angeles, CA, USA
Abstract :
This paper addresses the task of joint symbol-by-symbol decisions and maximum likelihood (ML) channel estimation using the PSP concept. Based on two popular algorithms, which have an inherent trellis structure two adaptive derivatives are proposed, namely per-survivor processing-optimum soft output algorithm (PSP-OSA) and PSP-SSA (sub-optimum soft output algorithm). The new algorithm (PSP-SSA) has a simplified form with complexity compared to PSP-MLSE. Simulation results show a significant improvement of the simpler PSP-SSA algorithm over the conventional structure, which consists of a hard-decision channel equalizer followed by a convolutional decoder
Keywords :
adaptive equalisers; adaptive signal processing; computational complexity; estimation theory; fading; land mobile radio; maximum likelihood estimation; PSP-MLSE; PSP-OSA; PSP-SSA; adaptive algorithms; complexity; convolutional decoder; hard-decision channel equalizer; maximum likelihood channel estimation; mobile fading channels; optimum soft output algorithm; simulation results; soft-decisions per-survivor processing; suboptimum soft output algorithm; trellis structure; Convolutional codes; Delay; Equalizers; Fading; Intersymbol interference; Maximum likelihood decoding; Maximum likelihood detection; Maximum likelihood estimation; Mobile communication; Viterbi algorithm;
Conference_Titel :
Vehicular Technology Conference, 1997, IEEE 47th
Conference_Location :
Phoenix, AZ
Print_ISBN :
0-7803-3659-3
DOI :
10.1109/VETEC.1997.600420
