Abstract:

In this paper, we incorporate the layered structure with low-density parity-check codes (LDPC) to develop a quasi-block diagonal LDPC space-time structure. The lower triangular structure of the parity check matrix introduces correlation between layers. In addition, each layer, as a part of the whole codeword, can be decoded while taking information from other undetected layers to improve the decoding performance. Belief propagation of the current layer is stopped as soon as those parity checks involving only the current layer and detected layers are satisfied. Simulation shows that the proposed system outperforms the conventional V-BLAST by 0.5 dB at WER=1%.