WCDMA上行链路空时接收机的研究

Study of space-time receiver in WCDMA uplink

提出了宽带码分多址 (WCDMA)系统基站中采用含天线阵的空时接收机结构 ,该接收机采用基于最大比合并的“天线阵波束形成———Rake接收”级联方式 .对该接收机在多径衰落信道下的性能进行了研究 ,基于WCDMA上行链路模型 ,分析了干扰加噪声的统计特性 ,导出了误比特率表达式 ,并在不同角度扩展情况下进行了讨论 .数值模拟结果显示采用天线阵可改善系统性能 ,即系统容量与天线数成正比 。

An antenna array-based base station space-time receiver structure for wideband code division multiple access (WCDMA) system is proposed. The receiver uses an antenna array beamformer-Rake structure with maximum ratio combining. The performance of the proposed receiver in multi-path fading channels is evaluated. Based on WCDMA uplink model, the statistics of interference plus noise is analyzed and the expression of bit error rate is derived and discussed in the case of different angle spreads. Numerical results show the system capacity is proportional to the number of antennas. They also show an additional performance improvement due to space diversity gain provided by angle spreads and antenna separation.