一种改进的部分并行干扰抵消多用户接收机

为解决部分并行干扰抵消（PPIC）多用户检测接收机中部分干扰因子如何确定的问题，定义了目标用户的期望输出与判决输出之间的均方误差期望性能函数，在引入离散互相关函数定义下，推导出不同用户扩频序列之间部分相关函数的期望性能函数，在引入离散互相关函数定义下，推导出不同用户扩频序列之间部分相关函数的期望值，从而给出了一个二级部分并行干扰抵消多用户检测接收机中自适应部分干扰因子的简单表达公式，并在此基础上研究了其相应的误码性能函数，同其他方法相比，该方法综合考虑了用户信噪比，系统用户数等因素的影响，使系统具有较强的自适应能力和鲁棒稳定性，其性能优于已有的基于固定干扰因子的性能，计算机仿真实验结果进一步验证了采用该方法的接收机性能。

Improved Partial Parallel Interference Cancellation Multiuser Receiver

In order to solve the problem of confirming a partial cancellation factor(PCF) in the partial parallel interference cancellation(PPIC) detector, a multiuser receiver employing two-stage partial parallel interference cancellation based on MMSE criterion between the anticipant output and the adjudging output for the object user is proposed and analyzed, where the anticipant value of partial correlation function for the different users' spreading sequences is given. Because the effect of users' number and users' signal to noise is considered, the results obtained based on PCF with strong adaptive capability and robust stability show that superior performance can be achieved to that of an existing fixed PCF algorithm. Computer simulation illustrates the performance of the proposed scheme.