MIMO系统中基于斜投影的盲空时多用户检测算法

针对多输入多输出(multiple input multiple output, MIMO)的码分多址(code division multiple access, CDMA)系统，提出了一种基于斜投影的盲空时多用户检测算法。该算法结合MIMO系统的空间分集技术与Alamouti空时分组码 (space time block coding, STBC)方案，自适应地跟踪干扰子空间和多天线信道，在此基础上对接收信号进行斜投影抑制多址干扰(multiple access interference, MAI)，解决了传统的基于子空间的最小均方误差(minimum mean square error, MMSE)盲空时多用户检测算法收敛速度慢和强干扰的情况下稳态性能低的问题，提高了多用户检测的鲁棒性，且计算复杂度较低。仿真结果表明该算法的有效性。

Blind space-time multiuser detection based on oblique projection for MIMO systems

A novel blind space time multiuser detection algorithm based on oblique projection is presented for multiple input multiple output (MIMO) code division multiple access (CDMA) systems. The proposed algorithm, which integrates the available information of spatial diversity technique with space time block coding (STBC) scheme of MIMO systems, can adaptively trace interference subspace and estimate wireless channels with low complexity. Then, an oblique projection algorithm is used for the received signal to suppress multiple access interference (MAI). Simulation results reveal that it has a faster speed of convergence and higher stable performance in strong MAI than the conventional blind minimum mean square error (MMSE) space time multiuser detection. So this algorithm is better in robustness and performance.