基于LDPC码与星座旋转准正交STBC的级联编译码方法

摘要

In a 4X4 multiple input multiple output (MIMO) system, in order to achieve full diversity and full data rate transmission so as to reduce the bit error rate of the system and improve the reliability of the system, a scheme concatenating low density parity-check (LDPC) codes and space time block codes (STBC) based on constellation rotation is put forward. At the same time, the optimum rotation angle is given. Simulation shows that the performance of this scheme is better than that of traditional schemes. When bit error ratio (BER) is 10~5, it has about 8 dB gain compared with the concatenated coding scheme of LDPC codes and orthogonal space-time block codes.%在4×4多输入多输出(multiple input multiple output,MIMO)系统中,为了同时达到全分集增益和全速率数据传输,进而达到降低系统误码率及提高系统可靠性的要求,提出将低密度奇偶校验(low density parity-check,LDPC)码与基于星座旋转的准正交空时分组码级联的编码方案,并找出了在全数据传输速率的前提下能够获得满分集增益的最优旋转角度.仿真结果表明,该级联编码方案误码率低于传统的LDPC编码与空时分组码级联的编码方案,在误码率为10-5的情况下,比LDPC码与正交空时分组码级联的编码方案有8dB左右的增益.