一种新的基于泄漏的多用户MIMO预编码

A new leakage based multiuser MIMO precoding algorithm

针对多用户MIMO基本SLNR预编码算法在发送天线数小于接收天线数之和时性能恶化的情况,考虑到接收滤波矩阵对泄漏功率的抑制作用,定义了一种新的信漏噪比形式,并基于信漏噪比最大准则,建立了一种最优发送预编码矩阵和接收滤波矩阵的联合设计方案。与基本SLNR算法相比,所给出的算法可以充分利用接收方的富裕空间进一步提高系统性能,增加系统支持的用户数目。仿真结果表明,当接收天线总数大于发送天线数时,只要子流数之和小于发送天线数,所给出的新算法依然具有非常优良的平均误比特率性能以及系统的和容量性能。

When the total number of receive antennas is large than the number of transmit antennas, the muhiuser MIMO SLNR precoding algorithm＇s performance would degrade significantly. To solve this problem, a new joint precoding and receive filter matrix design scheme is proposed based on maximum SLNR criterion. Considered the restrain ability of the receive filter matrix a gainst the leakaged power, the proposed scheme defines a new form of signal-to-leakage-and-noise ratio. Compared with the basic SLNR algorithm, the proposed method can take full advantage of the margin space of the receiver, increase supported user num bers. Simulation results indicate that as long as the sum of the substream number is smaller than the number of the receive anten nas, this method have very good average BER performance and system sum-capacity, even when the total number of receive anten nas is more than the transmit antennas.