在多用户MIMO系统中,基于信漏噪比(SLNR)的预编码由于同时消除了共信道干扰(CCI)和噪声而提高了系统性能。由于各用户的信道衰落不相同,信道质量的好坏直接影响了系统的性能。使用了一种动态功率分配算法,在SLNR预编码的基础上乘以功率分配系数,进一步改善系统性能。仿真结果说明了基于SLNR的预编码优于迫零(ZF)预编码,且采用动态功率分配后系统性能得到了进一步改善。
The precoding based on signal-to-leakage and noise ratio (SLNR) improves the system performance because it eliminates the co-channel interference (CCI) and the noise in multi-user MIMO system simultaneously. Because the channel state of every user is different, the channel quality directly affects the performance of the system. Hence, a dynamic power allocation which can get a better performance was used. It multiplies a coefficient of power allocation after the precoding. Simulation results prove that the performance based on SLNR is better than the zero-forcing (ZF) solution, and it is further improved after using the dynamic power allocation.