窄带干扰环境下的BOC信号捕获  

Accurate acquisition method of BOC signals in norrowband interference environment

作　　者：江晓磊[1] 张天骐[1] 赵军桃 

机构地区：[1]重庆邮电大学信号与信息处理重庆市重点实验室,重庆400065

出　　处：《电子技术应用》2016年第3期102-105,109,共5页Application of Electronic Technique

基　　金：国家自然科学基金项目(61371164);信号与信息处理重庆市市级重点实验室建设项目(CSTC2009CA2003);重庆市杰出青年基金项目(CSTC2011jjjq40002);重庆市研究生科研创新项目(CYS14140)

摘　　要：针对信道干扰会影响二进制偏移载波(Binary Offset Carrier,BOC)信号传输的正确性以及BOC信号自相关函数多峰值导致捕获模糊性的问题,提出了一种基于频域FFT重叠变换干扰抑制方法和相关重构方法相结合的BOC捕获算法。该算法首先通过对信号重叠加窗处理,降低信号的频谱泄露和减小信号的损失,然后通过频域陷波技术对干扰信号进行有效的抑制,最后将经过处理后的BOC信号利用相关重构方法进行捕获。仿真结果显示,该算法能够有效抑制窄带干扰信号,在信噪比为10 dB、信干比为-30 dB条件下误码率能够降为零,且该算法和其他算法相比捕获精度明显提高。Aiming at the two problems that channel interference affects the correctness of binary offset carrier（BOC） signals transmission and ambiguous acquisition of binary offset carrier（ BOC） signals caused by its auto- correlation, a lapped FFT based on frequency domain algorithm and relevant reconstruction method are proposed to capture the BOC signals with norrowband interference. Firstly,the received BOC signals are processed by overlapping windows transform to greatly reduce signals spectrum leakage and the loss of signals. Then the norrowband interference will be suppressed with the frequency domain notch filter technology. Finally, the received BOC signals which have been processed are captured by the relevant reconstruction method. The simulation results show that the proposed algorithm can effectively suppress the norrowband interference. Besides in one SNR and norrowband interference environment, the error rate can reduce to zero and the performance of capture is not influenced by norrowband any more. Compared with other algorithm, it has high precision of capture.

关 键 词：BOC信号 重叠变换 干扰抑制 相关重构 精确捕获 

分 类 号：TN911.4[电子电信—通信与信息系统] TN911.7[电子电信—信息与通信工程]