容量优化的多用户MIMO T-H预编码算法  

Capacity-optimized Tomlinson-Harashima precoding for multi-user MIMO systems

作　　者：王伟[1] 胡梅霞[1] 张海林[1] 

机构地区：[1]西安电子科技大学综合业务网国家重点实验室,陕西西安710071

出　　处：《华中科技大学学报（自然科学版）》2008年第9期59-62,共4页Journal of Huazhong University of Science and Technology(Natural Science Edition)

基　　金：陕西省自然科学基础研究计划资助项目(2006F30)

摘　　要：针对多用户多输入多输出(MIMO)系统的下行链路,提出一种优化系统容量的Tomlinson-Harashima预编码(THP)算法.该算法根据用户子信道的衰落状况,对各个用户分别采用不同的缩放因子进行干扰预抵消处理,有效降低了等效噪声的熵值.同时结合多用户预编码排序算法来改变THP算法的预编码顺序,改善了用户子信道的衰落系数.仿真表明:与传统的THP算法相比,该算法能够有效提高系统容量(特别是在低信噪比情况下).当信噪比为5 dB时,采用该算法的10×10 MIMO系统在容量上有4(bit.s-1)/Hz的增益.For multi-user multiple input multiple output （MIMO） downlink systems, a capacity optimized Tomlinson-Harashima precoding algorithm is proposed. The proposed algorithm uses different scaling factors to pre-cancel multi-user interference based on each user＇s channel state information, which decreases the entropy-value of the equivalent noise,thereby it can increase the system capacity. The algorithm also reordered the preeoding order to improve the subchannels fading coefficients. The simulation results demonstrate the algorithm can improve the system capacity greatly, especially at low signal to noise ratio （SNR）. For example, the proposed algorithm achieves a capacity improvement of 4 （bit · s-1）/Hz at SNR of 5 dB for 10×10 MIMO case.

关 键 词：多输入多输出 多用户 下行链路 预编码 容量优化 

分 类 号：TN929.5[电子电信—通信与信息系统]