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为了抑制多径衰落造成的符号间干扰 ,提高宽带码分多址 (WCDMA)系统的吞吐量 ,提出了一种多径干扰消除(MPIC)算法。在对原有的 MPIC算法性能进行理论分析的基础上 ,提出了对相邻的两级迭代输出再进行最大比合并 ,可以得到最佳的分集增益 ,因而具有比传统的 MPIC更强的多径干扰抑制效果。仿真结果表明 ,这种基于级间最大比合并的 MPIC算法 (MRC- MPIC)的误比特率明显优于传统的MPIC算法。当输入信噪比好于 15 d B时 ,级间最大比合并带来的系统性能增益在 3d B以上
In order to suppress inter-symbol interference caused by multipath fading and improve the throughput of wideband code division multiple access (WCDMA) system, a multipath interference cancellation (MPIC) algorithm is proposed. Based on the theoretical analysis of the performance of the original MPIC algorithm, it is proposed that the maximal ratio combining of the adjacent two-stage iterative output be performed to obtain the best diversity gain, and hence the multipath Interference suppression effect. The simulation results show that the bit error rate (MRC-MPIC) based on MPC algorithm based on maximal ratio combining is obviously superior to the traditional MPIC algorithm. When the input signal-to-noise ratio is better than 15 d B, the system performance gain brought by the maximum inter-stage ratio combination is above 3dB