摘要
针对多用户MIMO系统应用SLNR算法时由于干扰用户增加引起的系统性能下降问题,联合考虑误码率性能和信道质量,提出一种先把部分已知的多用户干扰加入SLNR准则进行抑制,根据信噪比大小确定预编码矩阵的设计顺序,再利用已知的多用户干扰迭代优化后续用户预编码矩阵的SLNR改进算法.由于只利用发射端信道信息优化预编码矩阵,改进算法无需基站与用户协作,计算复杂度低.对比仿真结果表明,改进算法收敛速度快,在高信噪比区域,误码率性能和系统容量增益得到了显著提升.
For the co-channel interference in multi-user MIMO system,an improved SLNR（signal-to-leakage-and-noise-ratio） pre-coding scheme is proposed,to solve the problem that the system performance declines with the increase of interference user.Combining BER performance and channel quality,the proposed scheme takes firstly the known multi-user co-channel interference into SLNR maximization criterion to be suppressed,uses SNR（signal-to-noise-ratio） sort each user＇s pre-coding matrix,then utilizes the known multi-user co-channel interference to iterate and optimize the follow-up user＇s pre-coding matrix,which can further improve system performance.Without collaboration between base station and user,the proposed scheme merely utilizes the channel information at transmitter to optimize pre-coding matrix,has low complexity and faster convergence.Simulation result shows that both BER performance and system capacity gain are greatly improved compared with the original SLNR,especially in high SNR.
出处
《郑州大学学报（工学版）》
CAS
北大核心
2012年第2期19-23,共5页
Journal of Zhengzhou University（Engineering Science）
基金
河南省科技创新人才计划项目(104100510008)
关键词
MIMO
信号泄露噪声比
最小误码率
迭代
multiple-input multiple-output（MIMO）
signal-to-leakage-and-noise-ratio
minimum bit error rate
iterate
