HMM soft-output decoder for QAM signals with a clustered constellation

Iain B. Collings*, John B. Moore

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingConference proceeding contribution

Abstract

This paper presents a new HMM soft-output decoder for QAM signals transmitted through narrow-band flat-fading channels, in the case where the signal constellation has points which are clustered into groups. Parallel HMM filters are used for QAM detection, with one filter for each group of constellation points. This greatly reduces the number of computations required. A Kalman Filter (KF) is then applied for channel estimation. The resulting adaptive algorithms appear as coupled KF and HMM filters. As well as having reduced computations, this approach does not require so called `hard-decoding-decisions' to be made, which results in better robustness to noise.

Original languageEnglish
Title of host publicationProceedings of the International Symposium on Signal Processing and its Applications, ISSPA
Place of PublicationPiscataway, NJ
PublisherInstitute of Electrical and Electronics Engineers (IEEE)
Pages172-175
Number of pages4
Volume1
Publication statusPublished - 1996
Externally publishedYes
EventProceedings of the 1996 4th International Symposium on Signal Processing and its Applications, ISSPA'96. Part 2 (of 2) - Gold Coast, Aust
Duration: 25 Aug 199630 Aug 1996

Other

OtherProceedings of the 1996 4th International Symposium on Signal Processing and its Applications, ISSPA'96. Part 2 (of 2)
CityGold Coast, Aust
Period25/08/9630/08/96

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