基于准正交空时分组码的Chase译码

提出了一种基于QR分解的Chase译码算法(Chase-QRD-SIC),分析并验证了发射天线数越少时,该算法与ML算法性能越接近,在2×2 V-BLAST系统中该算法能达到与ML一致的性能;然后针对4×4 QOSTBC系统,通过EVCM模型把其分解成两个独立的2×2 V-BLAST子系统,分别进行Chase-QRD-SIC译码。仿真表明在4×4 QOSTBC系统采用这种译码方案,能达到ML性能,而且由于减少了参与计算ML度量的路径条数,较ML算法具有更低的复杂度。

Chase Decoding for Quasi-orthogonal Space-time Block Codes

A Chase decoding algorithm (Chase-QRD-SIC) was proposed based on QR decomposition. The analysis and simulation testify that the fewer number of transmit antennas, the closer performance of the proposed algorithm is to ML algorithm. Its performance is virtually identical to ML decoding for 2×2 V-BLAST systems. At the same, the 4×4 QOSTBC systems can be decomposed to two independent 2×2 V-BLAST sub-systems according to the EVCM mode. The proposed algorithm is applied to each of the sub-systems. The simulation shows that the new decoding scheme is able to achieve ML performance for 4×4 QOSTBC systems, and the complexity of the new scheme is lower than that of the conventional ML decoding due to reducing the number of the paths used for calculating ML metric.