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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
Published in:
Information Theory, 1998. Proceedings. 1998 IEEE International Symposium on
Date of Conference: 16-21 Aug 1998
- Meeting Date :
- 16 Aug 1998-21 Aug 1998
- Print ISBN:
- 0-7803-5000-6
- INSPEC Accession Number:
- 6189005
- Conference Location :
- Cambridge, MA
- Digital Object Identifier :
- 10.1109/ISIT.1998.709066
- Product Type:
- Conference Publications
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