Title :
Analysis of ML-decoding of linear block codes using orthogonal signalling over Rayleigh-fading multiple-access channel
Author :
Haslach, Christoph ; Kim, Sang Wu
Author_Institution :
Inst. for Exp. Math., Essen Univ., Germany
Abstract :
We discuss soft decision decoding of a DS-SSMA scheme with orthogonal signalling. The asymptotic efficiency of the discussed system is 0.209 for hard decision decoding (HD) and 0.531 information bits per channel chip for error/erasure decoding with the ratio threshold test (RTT) respectively. We derive a surprisingly easy and optimal decoding rule and give an upper bound for the decoding error rate of soft decision ML-decoding. Applying the optimal decoding rule, a suboptimal decoding algorithm is suggested that combines the ideas of error/erasure decoding and Chase (1972) algorithm. Finally we propose a modified encoding such that the efficiency of the system is doubled
Keywords :
Hadamard codes; Rayleigh channels; Reed-Solomon codes; block codes; error statistics; linear codes; maximum likelihood decoding; multi-access systems; multiuser channels; optimisation; spread spectrum communication; telecommunication signalling; Chase algorithm; DS-SSMA; Hadamard code; Rayleigh-fading multiple-access channel; Reed Solomon code; asymptotic efficiency; decoding error rate; error/erasure decoding; hard decision decoding; linear block codes; modified encoding; optimal decoding rule; orthogonal signalling; ratio threshold test; soft decision ML-decoding; suboptimal decoding algorithm; system efficiency; upper bound; Block codes; Error analysis; Error correction; Error correction codes; High definition video; Mathematics; Maximum likelihood decoding; Rayleigh channels; Signal analysis; Upper bound;
Conference_Titel :
Information Theory, 1998. Proceedings. 1998 IEEE International Symposium on
Conference_Location :
Cambridge, MA
Print_ISBN :
0-7803-5000-6
DOI :
10.1109/ISIT.1998.709066
