无线衰落环境下基于相位平滑的多天线频域SUMPLE合成实现结构

Multi-Antenna Phase Smoothing Frequency-Domain SUMPLE Combining Structure in Wireless Fading Channels

为应对无线衰落传输环境中非合作接收场景存在信道先验信息缺失问题,将SUMPLE合成算法应用于多天线盲接收系统,设计基于相位平滑的改进频域SUMPLE合成接收结构。通过滑动窗设计实现对频域数据的重叠划分,利用相邻频点的相位约束保证合成信号的相位连续性,克服经典SUMPLE算法相位漂移现象带来的性能损失。与现有的频域分量最大比合并算法(FMRC)相比,改进的频域SUMPLE算法以合成信号为参考,在提升合成信号信噪比的同时优化了信号的相位谱,降低了后端均衡器的设计复杂度。理论分析和仿真结果验证了上述接收结构的可行性和有效性。

In non-cooperative reception scenarios where prior channel information is unavailable,the receiver design for multi-antenna system is difficult. In this paper,we propose an improved frequency domain SUMPLE combining receiver structure with phase smoothing. The overlapping and division of frequency data is realized through an elaborately designed sliding window. The phase continuity of the combined output signal is ensured by the phase constraint of adjacent frequency points,which overcomes the performance degradation caused by the phase drift of classical SUMPLE algorithm. Compared with the existing frequency-domain maximum ratio combining algorithm（ FMRC）,the proposed algorithm uses the synthesized signal as a reference signal,which can optimize both the signal-to-noise ratio and phase spectrum of the combined output signal. Moreover,design complexity of the back-end equalizer is reduced at the same time. Theoretical analysis and simulation results verify the feasibility and validity of the proposed receiver structure.