调制跳变系统同步捕获方法及性能分析

调制跳变技术是一种以伪随机方式控制调制方式跳变,通过缩短每种调制方式持续时间对抗调制识别的新型抗截获技术.为实现调制跳变信号有效、快速捕获,提出了匹配相关双驻留并行捕获方法,并对其性能进行了分析.该方法通过对调制标识码进行匹配相关实现调制识别,采用双驻留并行方式进行同步捕获,确保了低信噪比、小样本数据条件下的捕获性能.分析结果表明:AWGN信道下该方法具有较好的信号识别性能以及较短的平均捕获时间,但瑞利衰落信道下性能相对较差,此时采用基于RAKE接收的匹配相关法将有效改善双驻留并行捕获的性能.

Synchronization Acquisition Approach and Acquisition Performance Analysis of Modulation Hopping System

Modulation hopping technique is a new kind of anti-interception technology against modulation recognition by shortening the duration of each modulation and keeping modulation hopping in pseudo-random way. In order to capture modulation-hopping signal effectively and rapidly, a dual-dwell parallel acquisition approach with code matching is proposed, and the acquisition performance is analyzed. This approach is used to realize modulation classification by matching modulation identification code and make synchronization acquisition by dual-dwell parallel approach, and finally ensure good performance on the condition of low SNR and few signal symbols. The analysis results verify that the approach has higher modulation recognition rate and shorter average acquisition time on AWGN channel. However, the performance on Rayleigh fading channel is relatively poor; in such case, the use of an improved RAKE-based method can effectively enhance the performance effectively.