一种基于天线阵列的相干多径信号接收方法

Receiving Method for Coherent Multi-path Signals Based on Antenna Array

在密集的城区环境下,多径传播导致接收信号的角度扩展和时延扩展,不同路径的到达信号通常具有不同的入射角度和传播时延。传统的波束形成器只针对期望用户的一条主要路径信号进行处理,而其他路径信号作为干扰被抑制。提出了一种基于天线阵列的相干多径信号接收方法,将天线阵列接收到的各路径信号进行延迟相干合并,使得合并信号的信干噪比优于任何单一路径接收的阵列输出信干噪比,从而极大地改善了系统的比特误码率(BER)性能。仿真结果验证了这种接收的方法的有效性。

In the dense urban, the multi-path propagation can cause severe angle and delay spread of received signals. The arriving signals from different paths may have different DOAs and different delays. Traditional beamforming techniques only process the signal of the main path, while other multi-path components are suppressed as interfering signals. A receiving method for the coherent multi-path signals based on the antenna array was proposed. The signals received by the antenna array was processed respectively with respect to the propagation paths, and the outputs of the antenna array were combined delayedly and coherently The SINR of the combined signal was enhanced comparing with that of the single path processing method. And the BER performance of the system was improved significantly. Simulation results show the effectiveness of this receiving method.