Title :
Reduced-complexity soft-output Viterbi equalizer
Author :
Qian, Xue-Cheng ; Zhao, Chun-Ming ; Cheng, Shi-xin
Author_Institution :
Nat. Mobile Commun. Res. Lab., Southeast Univ., Nanjing, China
Abstract :
In the classical soft-output Viterbi equalizer, the trace-back operation is required for computing the reliability information of the symbols on survivor paths. To reduce the complexity, a simplified algorithm is offered in this paper, which uses metric difference of merging paths to provide the reliability information. In this algorithm, the trace-back operation is avoided. Both forward and backward forms of this algorithm are provided. Simulation results show that the performance of this algorithm is close to the classical SOVA in both a binary GSM system and an 8-ary PAM system
Keywords :
adaptive equalisers; cellular radio; computational complexity; maximum likelihood sequence estimation; pulse amplitude modulation; 8-ary PAM system; AWGN; ISI; SOVA; adaptive equalizer; additive white Gaussian noise; algorithm; backward algorithm; binary GSM system; fading channel; forward algorithm; intersymbol interference; maximum likelihood sequence estimation; metric difference; performance; reduced-complexity soft-output Viterbi equalizer; reliability information; simulation results; survivor paths; AWGN; Additive white noise; Equalizers; Interference; Laboratories; Maximum likelihood detection; Maximum likelihood estimation; Merging; Mobile communication; Viterbi algorithm;
Conference_Titel :
Communication Technology Proceedings, 1998. ICCT '98. 1998 International Conference on
Conference_Location :
Beijing
Print_ISBN :
7-80090-827-5
DOI :
10.1109/ICCT.1998.743112
