SDL阵列宽带零陷展宽波束形成

doi:10.3969/j.issn.0255-8297.2016.01.002

应用科学学报 ›› 2016, Vol. 34 ›› Issue (1): 12-21.doi: 10.3969/j.issn.0255-8297.2016.01.002

SDL阵列宽带零陷展宽波束形成

张薇, 徐林, 许泉欣, 王勇

哈尔滨工程大学信息与通信工程学院, 哈尔滨 150001

收稿日期:2015-03-26 修回日期:2015-10-26 出版日期:2016-01-30 发布日期:2016-01-30
作者简介:张薇,副教授,研究方向:宽带无线通信系统、现代信号处理、宽带MIMO技术及多用户OFDM等,E-mail:zhangwei@hrbeu.edu.cn
基金资助:
国家自然科学基金(No.61275082)资助

Null Broadening Wideband Beamforming for SDL Based Array

ZHANG Wei, XU Lin, XU Quan-xin, WANG Yong

College of Information and Communication Engineering, Harbin Engineering University, Harbin 150001, China

Received:2015-03-26 Revised:2015-10-26 Online:2016-01-30 Published:2016-01-30

摘要/Abstract

摘要： 传统宽带自适应波束形成算法在信号带宽较宽时硬件实现困难且形成零陷较窄.针对此问题,利用传感器延迟线阵列结构替代传统的时域抽头延迟线结构,在此基础上提出基于空间响应偏差约束的宽带零陷展宽波束形成方案.对参考频率干扰信号方向邻域的波束响应进行最大值约束,然后利用SRV约束将零陷展宽,通过凸优化工具求得最优加权向量.仿真结果表明,该算法可在保证波束宽度的同时实现宽带零陷展宽.在零陷宽度设定为10°、零陷深度为-30 dB的条件下,零陷宽度实测值可以达到14.7°,且具有较高的输出信干噪比.

关键词: 自适应波束形成, 传感器延迟线阵列, 零陷展宽, 凸优化

Abstract: Traditional adaptive wideband beamforming is difficult to be implemented with hardware, and has narrow null width in direction of interference. To deal with the problem, a novel null broadening wideband beamforming algorithm based on spatial response variation (SRV) constraint is proposed. Tapped delay-lines based systems are replaced with a structure based on sensor delay-lines (SDL). At the reference frequency, the beam response in the direction of interference is limited by using a maximum constraint. An SRV constraint based algorithm is used to broaden the region of nulls. An optimal weight vector is obtained using a convex optimization tool. Simulation results show that, with the proposed algorithm, null broadening and constant beam width can be realized at the same time of wideband beamforming. When null width is set to 10° and null depth is -30 dB, a measured null width of 14.7° can be obtained, and the system has a high output signal to interference and noise ratio (SINR).

Key words: adaptive beamforming, sensor delay-lines (SDL) array, null-broaden, convex optimization

中图分类号:

TN911.72

张薇, 徐林, 许泉欣, 王勇. SDL阵列宽带零陷展宽波束形成[J]. 应用科学学报, 2016, 34(1): 12-21.

ZHANG Wei, XU Lin, XU Quan-xin, WANG Yong. Null Broadening Wideband Beamforming for SDL Based Array[J]. Journal of Applied Sciences, 2016, 34(1): 12-21.

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SDL阵列宽带零陷展宽波束形成

Null Broadening Wideband Beamforming for SDL Based Array

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