基于多载波信号的确定型自适应阵列波束形成方法

确定型波束形成方法利用单次采样数据完成波束形成,不需要信号的统计特性.该类方法在雷达系统中均需要两个步骤:波达方向估计和波束形成.一般为了保证系统稳定性,需要保持一定的主瓣宽度,其代价是牺牲部分波束形成自由度.研究了确定型波束形成算法在多载波扩频通信系统中的应用,提出了利用多载波调制信号的频率分集特性完成波束形成,不需要波达方向估计过程,也不需要牺牲波束形成自由度以保证系统稳定性,同时还获得相干多径合并.给出了相应的仿真实验及相关分析,验证了算法的有效性.

Adaptive deterministic beamforming algorithm for multi-carrier signal

Deterministic beamforming is accomplished with a single snapshot sampling data,without any assumption of the signal's statistics.Existing deterministic beamforming approaches require two steps: estimating the direction of the desired signal,and then forming beampattern.In these approaches,the robustness against direction estimate errors consumes the freedom of beamforming.Applying deterministic beamforming to multi-carrier spread spectrum communications system is investigated,and an approach is proposed to exploit the frequency diversity of multi-carrier signal to form the beampattern directly,avoiding any independent direction estimate,and combining coherent multipath components.Simulations are carried out to examine the performance of the proposed approach,and relevant analysises are also given.