一种改进的码分多址通信系统的多用户干扰抵消接收机

An Improved Multiuser Interference Cancellation Receiver for CDMA System

在码分多址通信系统中，由于许多用户占用同一信道进行通信，传统的单用户检测策略和最佳的多用户检测策略不是很实用。本文对直接序列—码分多址系统的多用户检测策略和次最优检测策略进行了分析和阐述，讨论了一种改进的多级并行干扰抵消接收策略，最后给出了几种模拟结果。

In DS-CDMA system,a number of users share a common frequency bands. In such a system ,Conventional single-user detector which is highly vulnerable to the near-far effect is not practical in use. However the associated exponential computational complexity with the optimal detector prohibits its practical use. In paper , Verdu proposed decorrelating receiver which offer a significantly improved performance. Unfortunately, when the user is assigned long code, it is very difficult to compute its inverse matrix. In paper , Varanasi and Aazhang proposed multistage detector. Generally speaking, this kind of detectors which bases on the ideas of 'multistage' is practical in use. In this paper an improved Parallel Interference Cancellation (PIC) detection will be discussed. And the simulation results are given.