基于接收波束成形的自动识别系统的同信道干扰抑制和解调  

Received Beamforming-Based Interference Suppression and Demodulation for AIS with Co-Channel Interference

作　　者：丁冬冬[1] 束锋[1] 钱振宇[1] 王建新[1] 盛卫星[1] 陆锦辉[1] 

机构地区：[1]南京理工大学电子工程与光电技术学院,南京210094

出　　处：《数据采集与处理》2015年第4期868-874,共7页Journal of Data Acquisition and Processing

基　　金：国家自然科学基金(61271230)资助项目;东南大学移动通信国家重点实验室开放课题(2013D02)资助项目

摘　　要：自动识别系统卫星接收机可接收来自多个同频段蜂窝信号,不可避免地会产生同信道的信号干扰,抑制此同信道干扰是自动识别系统的最具挑战性问题之一。为了解决此问题,提出波达角估计、波束成形加解调的简单串行接收机结构。此结构首先采用多信号分类(Multiple signal classification,MUSIC)和Capon等算法估计出目标信号和干扰信号的波达方向角,然后利用最小方差无失真响应(Minimum variance distortionless response,MVDR)、匹配滤波(Matched filter,MF)和最小均方误差(Minimum mean square error,MMSE)等波束成形方法将阵列方向对准目标信号入射方向抑制干扰信号,最后采用二比特差分解调算法检测有用信号。仿真结果表明:本文提出的结构同单接收天线相比,多天线波束成形显著地抑制了同信道干扰,极大地改善了高斯滤波最小频移键控(Gaussian-filtered minimum shift keying,GMSK)信号解调的误比特率性能。Automatic identification system（AIS）satellite receiver can receive signals from different cells with the same frequency band,and these signals form co-channel interference（CCI）.Suppressing CCI is one of the most challenging issues of the AIS system.A simple serial receiver structure consisting of a direction of arrival（DOA）estimator,a beamformer and a demodulator is proposed.In this structure,incident angles of all desired and interference signals estimated by multiple signal classification（MUSIC）and Capon are given.Then minimum variance distortionless response（MVDR）,minimum mean square error（MMSE）and matched filter（MF）beamforming algorithms are employed to make the steering vector align with the incident direction of the desired signal to suppress the undesired interference signals.Finally,a two-bit differential demodulation algorithm is applied to detect the useful signal.The simulation results show that the proposed structure,compared with the single receiving antenna,significantly suppresses CCI and notably improves the bit error rate（BER）performance of Gaussian-filtered minimum shift keying（GMSK）by using multiple antenna beamforming.

关 键 词：自动识别系统 同信道干扰 波束成形 

分 类 号：TN297.23[电子电信—物理电子学]