频域均衡联合基于能量排序的部分并行干扰删除检测算法

针对频率选择性信道下的DS-CDMA系统,该文提出了一种联合MMSE(最小均方误差)频域均衡与基于能量排序的部分并行干扰删除(MMSE-EOPPIC)的多用户检测算法。该算法首先采用基于重叠剪切法的MMSE频域均衡代替Rake接收机对各用户的数据信息进行初始估计,然后在干扰删除的每个迭代级根据用户能量由强到弱的顺序依次对用户进行部分干扰删除;为了提高每个迭代级检测的可靠性,该文将当前级已经检测出的能量较强用户的硬判决值用于重构当前级能量较弱用户的多址干扰(MAI)。仿真结果表明MMSE-EOPPIC检测算法可以有效提高系统的比特误码率性能。

A Detection Algorithm Combined Frequency Domain Equalization with Partial Parallel Interference Cancellation Based on Energy-Ordering

In this paper, a multiuser detection algorithm (named MMSE-EOPPIC) combined MMSE frequency domain equalization (MMSE-FDE) with Partial Parallel Interference Cancellation based on Energy-Ordering (EOPPIC) is proposed for DS-CDMA system over frequency-selective channels. MMSE-FDE based on overlap-cut method instead of Rake receiver is firstly used to initially estimate all users’ data information, and then partial interference cancellation is in turn implemented for each user in descending order of estimated energy at each iterative stage. In order to improve the detection reliability of each iterative stage, the stronger users’ current stage hard decisions are used to regenerate the weaker users’ multiple access interference (MAI). Simulation results show that MMSE-EOPPIC can efficiently improve the Bit Error Rate (BER) performance of system.