数字波束相位成形失真分析

数字波束系统中,通常采用相位加权实现波束成形,但这种方式对具有一定带宽的调制信号而言是存在失真的。为了研究这种失真对典型数字通信的影响,首先建立了一维线性均匀加权直线阵数字波束成形模型,介绍了这种阵列天线相位波束成形的原理,随后结合BPSK调制信号,对数字波束相位成形过程进行推导,获得相位成形波束接收信号数学表达式。通过分析表明对于BPSK调制信号而言,相位波束成形会引入码间串扰,并且串扰影响随着阵列规模增大、信息速率提高、波束扫描角度增大而加剧。

Distortion analysis of digital beam phased forming

In digital beam systems,the beam forming is realized by phased weighting mechanism,but for modulation sig-nal with wide-bands,the distortion may arise. To research the influence of this kind of distortion on typical digital communica-tion,a model of digital beam systems with ne-dimensional liner homogeneous weighting is established,and the mechanism of phased weighting digital beam forming is introduced. The forming process of the digital beam phased is deduced in combination with BPSK modulated signal,and the mathematical expression is obtained. Through analysis it is proved that for BPSK modulated signal,the inter-symbol interference would be brought into phase beam forming,the influence of which is increasing with the en-largement of array size,the enhancing of the information rate and increasing of beam scanning range.