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2008•IEEE Communications LettersRequires access

Decoding the golden space-time trellis coded modulation

Barbara Cerato, Guido Masera, Emanuele Viterbo

Open publisher page 5 citations

Abstract

This letter presents new techniques enabling low complexity implementation of a decoder for 2 times 2 MIMO using an inner space-time block code (STBC) concatenated with an outer trellis coded modulation (TCM). The receiver includes a Viterbi decoder and sphere decoders to compute branch metrics. We present a technique to reduce the number of sphere decoding processes at each step of the trellis still retaining maximum- likelihood (ML) frame-error rate (FER) performance as well as a sub-optimal technique to speed up the decoding, with a negligible FER performance loss.

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What this paper is about

This letter presents new techniques enabling low complexity implementation of a decoder for 2 times 2 MIMO using an inner space-time block code (STBC) concatenated with an outer trellis coded modulation (TCM). The receiver includes a Viterbi decoder and sphere decoders to compute branch metrics. We present a technique to reduce the number of sphere decoding processes at each step of the trellis still retaining maximum- likelihood (ML) frame-error rate (FER) performance as well as a sub-optimal technique to speed up the decoding, with a negligible FER performance loss.

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Available abstract

This letter presents new techniques enabling low complexity implementation of a decoder for 2 times 2 MIMO using an inner space-time block code (STBC) concatenated with an outer trellis coded modulation (TCM). The receiver includes a Viterbi decoder and sphere decoders to compute branch metrics. We present a technique to reduce the number of sphere decoding processes at each step of the trellis still retaining maximum- likelihood (ML) frame-error rate (FER) performance as well as a sub-optimal technique to speed up the decoding, with a negligible FER performance loss.

Key concepts: Decoding methods, Viterbi decoder, Space–time block code, Computer science, Trellis (graph), Space–time trellis code, Algorithm, Soft-decision decoder

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