多用户MIMO系统中结合天线选择的协同差分空时传输方案

内容简介：针对多用户多入多出(MIMO)系统中存在部分信道估计困难的情况,提出了一种新的协同差分空时传输方案.在此方案中引入了一种简单的自适应放大转发中继协议,该协议在中继节点结合了接收选择合并和发送天线选择,仅需要部分信道状态信息(CSI).得出了最大似然差分检测方法,分析了系统的成对码字差错概率(PEP)性能.仿真结果显示,在相同收发天线教、功率及频谱效率条件下,所提方案比点对点MIMO系统中的差分传输方案获得了更高的分集增益和更好的误比特率(BER)性能.且在高信噪比情况下,还优于采用相干检测的非协同Alamouti传输方案.

Abstract：A new cooperative differential space-time transmission scheme was proposed for multiuser multiple-input multiple-output (MIMO) systems where channel estimation was difficult. And a simple adaptive amplify-and-forward (AF) relaying protocol was developed for the proposed scheme. The protocol combined selection combination and transmit antenna selection at the relay node and it required only partial channel state information (CSI) of the relay link. The maximum likelihood differential detection method was derived and the performance of pairwise error probability (PEP) was analyzed. Simulation results show that the proposed scheme achieves higher diversity gain and better bit-error rate (BER) performance compared with the differential transmission scheme in point-to-point MIMO system with the same number of transmit and receive antennas and with equal transmit power and spectral efficiency. At high signal-to-noise rate (SNR), the proposed scheme even outperforms non-cooperative Alamouti scheme with coherent detection.

作者：赵金旺, 徐友云, 蔡跃明,

关键词：多入多出, 差分空时码, 协同通信, 天线选择,