拥挤干扰环境下的一种多载波扩频信号接收波束成形方法

针对拥挤干扰环境中的多载波扩频通信系统,提出了一种基于期望信号波达方向估计和干扰功率空间谱分析的波束成形方法。该方法首先利用多载波扩频调制信号的频率分集特性估计期望信号的波达方向,然后利用空间谱分析估计干扰信号的空间功率分布,在此基础上完成波束成形。该方法能够在拥挤强干扰环境下精确估计信号的波达方向,从而保证了干扰信号空间谱估计的有效性。仿真结果表明,即使干扰信号的功率显著强于期望信号,本算法仍然能够精确地估计出期望信号的波达方向,从而保证算法的有效性。

A Beamforming Algorithm for Multi-carrier Signal in Crowded Interference Environment

A beamforming algorithm is proposed for multi-carrier signal in crowded partial-band interference environment,using frequency diversity of multi-carrier modulation.The proposed algorithm uses two diversity branches of the desired multi-carrier signal to estimate its direction,and then estimates the interference and noise power spectrum with classical spectral estimation method,finally the beamforming weight vector is obtained according to maximal output signal-to-noise ratio criteria.The proposed algorithm forms a maximum response to the desired multi-carrier signal,and uses all available degrees of freedom to suppress the interference at the same time,even if the number of interference signal saturates the degrees of freedom of the antenna array.Simulations show that the performance of the proposed algorithm is satisfactory even with crowded interference signals whose power is much higher than the desired signal.