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

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 subchannel 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