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A fast algorithm for maximum likelihood detection of QPSK or π/4-QPSK sequences with unknown phase

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1 Author(s)

Maximum likelihood sequence detection (MLSD) of differentially encoded MPSK uses a joint decision on N symbols to achieve a performance gain over conventional 2 symbol differential detection. This paper gives a fast (optimum) algorithm to implement MLSD; the number of operations per N symbol block is of order N log2 N. Thus, it is practical to implement MLSD for any reasonable N for moderate symbol rates; this is useful for the land mobile satellite and digital cellular channels

Published in:

Personal, Indoor and Mobile Radio Communications, 1992. Proceedings, PIMRC '92., Third IEEE International Symposium on

Date of Conference:

19-21 Oct 1992