Adaptive Trellis and Bit-Interleaved Coded Modulation for Ordered MIMO-OFDM Channels

Konferenz: PIMRC 2005 - 16th Annual IEEE International Symposium on Personal Indoor and Mobile Radio Communications
11.09.2005 - 14.09.2005 in Berlin, Germany

Tagungsband: PIMRC 2005

Seiten: 5Sprache: EnglischTyp: PDF

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Li, Yuan; Liang, Ying-Chang; Sun, Sumei (Institute for Infocomm Research, 21 Heng Mui Keng Terrace, Singapore 119613)
Zhang, Rui (Department of Electrical Engineering, Stanford University, Stanford, CA94305, USA)

An adaptive trellis coded modulation (TCM) and bit-interleaved coded modulation (BICM) scheme is proposed for ordered MIMO-OFDM channels, derived through singular value decomposition (SVD) based eigen-beamforming and sub-channel grouping techniques. By deriving bit-error-rate (BER) upper bound of TCM and BICM for the ordered channels, it is observed that TCM is better than BICM for the grouped channels with less fluctuation, while BICM is better than TCM for severely fluctuated grouped channels. Thus for a given throughput requirement, the proposed scheme adaptively selects the suitable TCM or BICM for each of the grouped channels, based on available power budget and BER constraint. We show that the adaptive TCM/BICM scheme has superior performance over all-TCM and all-BICM schemes, especially when bit loading and power allocation are jointly applied.