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

fYear

1998

fDate

22-24 Oct 1998

Firstpage

144

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Communication Technology Proceedings, 1998. ICCT '98. 1998 International Conference on

Conference_Location

Beijing

Print_ISBN

7-80090-827-5

Type

conf

DOI

10.1109/ICCT.1998.743112

Filename

743112