并行干扰抵消算法在多用户检测中的应用

首先提出了一种将完全并行干扰抵消(PIC)与阵列天线相结合的空时多用户检测技术。给出的仿真结果证明：引入PIC算法后的空时多用户检测系统性能得到改善，计算复杂度得以降低；但是由于PIC随着级数的增加出现不稳定状态，因此针对它的收敛文中又提出一种大系统中(用户数和扩频增益趋于无穷，而其比值保持恒定)的部分并行干扰抵消算法，以此作为完全PIC算法的一种改进。仿真结果表明：这种部分PIC算法误码率最终收敛于MMSE算法，并且收敛因子的计算有所简化。

Multiuser detection based on parallel interference canceller

In order to address the shortcomings of the rake receiver and optimal multiuser detector in a CDMA system, we first propose multiple antenna receivers combining space-time processing with parallel interference canceller(PIC). By the given simulations we show that PIC can further provide better performance with low computational complexity, and in order to assure its convergence we analyze the partial PIC(PPIC) in a large system to be a remedy, we also give a specific expression for its SINR, the simulation results show that this algorithm converges to MMSE as the stages increase.