【摘要】 :在CDMA中通常采用RAKE接收机来实现多径分集 .本文提出了TDD CDMA系统的一种新的多径分集方案 .它在发送端采用一个FIR滤波器 ,而在接收端采用RAKE接收机实现多径合并 .分析结果表明 ,对FIR滤波器的系数进行优化的问题相当于求解矩阵的特征值和特征向量的问题 ,而最大的特征值所对应的特征向量就是最佳FIR滤波器的抽头系数 .数值分析表明 ,采用上述方案的系统的输出信噪比 (SNR)较之通常的RAKE系统或者Pre RAKE系统有较大的提高 .更多还原

【Abstract】 RAKE combiner is always used in CDMA systems to gain the multipath diversity.In this paper,a novel multipath diversity scheme used in TDD CDMA systems is proposed.Compared with the conventional RAKE receiver,a FIR filter is added in the transmitter.We will see the filter optimization may be viewed as an eigenvalue problem,and the maximum eigenfilter [2] is the optimum FIR filter.Numerical results show that this new scheme can greatly improve the output Signal to Noise Ratio (SNR) compared with conventional RAKE receiver or Pre RAKE combiner.更多还原