长码CDMA系统上行链路多用户接收机设计

提出一种适用于长码CDMA移动通信系统上行链路的多用户接收机设计方案，包括多用户信道估计、多用户检测以及信道跟踪等算法。通过把用户传播时延的影响放入信道响应矩阵中，由信道估计间接得出各用户的传播时延。使用迭代运算的方式使得运算量分散，降低了对硬件平台的要求，使算法更为适用。增大观察窗的长度达到了更准确的用户信息比特判决，提高了接收机的性能。仿真结果表明文章提出的接收机设计方案具有很好的远近效应抑制能力，性能远高于传统的单用户Rake接收机。

Multi-user Receiver Design for Uplink Long Code CDMA System

A multi-user receiver scheme for uplink long code CDMA system is proposed,including multi-user channel estimation,multi-user detection and channel tracking scheme.The users' propagation delays inputting into the channel impulse response matrix are indirectly estimated by the channel estimation scheme.Using the iterative algorithms,the computation complexity is much lowered,thus the scheme is more applicable.The receiver performance is much heightened by extending the observation window.The results of simulations indicate that the proposed receiver scheme is near-far resistant,and is much more superior to the traditional single user Rake receiver.