A low-complexity MIMO system with soft interference mitigation

We present a low-complexity combination of a BLAST-like MIMO system and bit-interleaved coded modulation with iterative decoding (BICM-ID). We present a method to exploit soft information stemming from the outer decoder to mitigate the influence of multistream interference. Furthermore, we introduce an inner code to remove the error floor which is normally present in BICM-ID systems. This code is of rate one and has memory one; it thus adds no redundancy and only very little complexity. Both schemes are evaluated in the EXIT chart and with BER simulations.