摘要
多天线基站和多用户可以组成一个多用户MIMO系统,为获得更高的系统容量和高效传输性能。预编码是一种应用于发射端以达到抑制多用户间干扰的预均衡方法。基于非理想信道状态信息(CSI)条件,针对多用户MIMO系统的下行信道,研究了线性ZF预编码和非线性THP预编码的性能,给出了接收端信号与干扰和噪声比SINR的近似表达式。对两种THP变体结构,dTHP结构和cTHP结构进行了性能仿真比较。仿真结果表明,cTHP结构的性能要优于dTHP结构。同时,给出了信道估计误差对cTHP结构BER影响的定量仿真结果。对非理想CSI下的预编码技术选择提供了一定的依据,并对限定信道估计误差的偏差程度具有参考意义。
The muhiuser multiple - input - multiple - output （MIMO） system which has a base station with multipie antennas and multiple users can have the remarkable capacity. Precoding is a pre - equalization technique that suppresses the interference between users at the transmitter. In this paper, the investigation of Tomlinson - Harashima precoding （THP） and linear zero- forcing precoding （ZF） in downlink muhiuser MIMO systems with imperfect channel state information （CSI） is performed. The approximate signal - to - （ interference - plus - noise） ratio （SINR） expression is given under the assumptive？ condition. The comparison between the two basic THP structures and the ZF precoding is carried out, and the cTHP structure is better than others. Furthermore, the influence of the CSI error was simulated. This paper has given a rule to choose the precoding technology with imperfect CSI. And the result is also meaningful to limit the channel error.
出处
《计算机仿真》
CSCD
北大核心
2010年第5期109-111,131,共4页
Computer Simulation
