中文摘要：

为降低MIMO检测算法的计算复杂度并保证系统性能,在格约减辅助MIMO检测算法的基础上,引入噪声投影按序逐次消去（OSNPC）算法,采用最小均方误差（MMSE）准则,构成改进的LLL-MMSE-OSNPC算法。OSNPC算法从判决变量向量中逐次消去已知的噪声投影,避免排序干扰,逐步消去（OSIC）算法中对矩阵的求逆运算,降低复杂度。以QPSK和16QAM调制方式为例进行理论分析和仿真,其结果表明,LLL-MMSE-OSNPC算法在性能上等效于LLLMMSE-OSIC算法,但复杂度大为降低。

英文摘要：

To reduce complexity of the detection algorithm in MIMO system and guarantee the performance of the system,an im-proved algorithm called LLL-MMSE-OSNPC was proposed.Ordered successive noise proj ection cancellation （OSNPC）algorithm was introduced on the based of LR-aided minimum mean square error （MMSE）detection.The OSNPC algorithm successively cancelled the known noise proj ections from the decision statistic vector.The inverse of the matrices in the ordered successive in-terference cancellation （OSIC）algorithm was avoided and the complexity was reduced.Taking QPSK and 1 6 QAM modulation means as examples,results of theoretical analysis and simulation show that the performance of LLL-MMSE-OSNPC algorithm is equivalent to that of the LLL-MMSE-OSNPC algorithm,but it has significantly less complex computation.