Boosted space-time diversity scheme for wireless communications

Abstract

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A novel concept of space-time diversity is developed. It is similar to 2×2 bit-interleaved space-time coded modulation with iterative decoding (BI-STCM-ID), except for labelling maps, which are different for the signals transmitted through particular antenna. In such an approach the so-called waterfall region of BER curves is observed at lower SNRs than for BI-STCM-ID systems. At the same time the proposed ‘boosted’ scheme is characterised by good BER against SNR asymptotic performance, which is proved by the results of Extrinsic Information Transfer (EXIT) Chart analysis, error-free feedback (EF) bounds, and results of the overall system simulation. It is shown that numerous labelling maps can be combined with a Gray one to meet specific requirements.