基于时分数据调制信号的N-χ系数捕获判决方法  

N-χ Coefficient Capture Decision Method Based on TDDM Signal

作　　者：冯永新[1] 何宽 刘芳[2] 梁东 FENG Yongxin;HE Kuan;LIU Fang;LIANG Dong(Graduate School, Shenyang Ligong University,Shenyang 110159, Liaoning, China;School of Information Science and Engineering,Shenyang Ligong University, Shenyang 110159, Liaoning, China)

机构地区：[1]沈阳理工大学研究生院,辽宁沈阳110159 [2]沈阳理工大学信息科学与工程学院,辽宁沈阳110159

出　　处：《兵工学报》2022年第5期1117-1128,共12页Acta Armamentarii

基　　金：国家自然科学基金项目(61971291)。

摘　　要：时分数据调制(TDDM)信号的应用大大提高了扩频通信系统的频带利用率和适应复杂环境的能力。针对TDDM信号捕获过程中的基带数据翻转位置模糊问题,考虑到TDDM信号独有的调制特性以及现有捕获判决方法的不足,提出一种N-χ系数捕获判决方法,该方法基于基带数据翻转位置与并行处理中相关结果的线性关系建立χ系数判决式,通过对当前累积时间进行N分段并测得每段区间内χ系数的平均值,进而得出基带数据翻转的准确位置。仿真结果表明:当分段数N≥4时,N-χ系数捕获判决方法判决基带数据翻转位置的精确度在99%以上;与模糊抑制捕获判决方法进行对比分析,无论是捕获精度或是环境适应性,N-χ系数捕获判决方法都优于模糊抑制捕获判决方法,验证了该方法用于消除基带数据翻转位置模糊问题的有效性和先进性;该方法的研究为新一代扩频调制接收设备的开发提供了理论参考。The application of time division data modulation(TDDM)signal greatly improves the frequency band utilization rate and the ability to adapt to complex environments of spread spectrum communication system.For the ambiguity problem of the baseband data reverse position during TDDM signal capture,a N-χcoefficient capture decision method is proposed,in whichthe unique modulation characteristics of TDDM signals and the shortcomings of the existing capture decision methods are considered.The proposed method is to establish theχcoefficient decision formulabased on the linear relationship between the baseband data reverse position and the correlation result in parallel processing,and the accurate position of the baseband data reverse is obtained by dividing the current accumulation time into N segments and measuring the average value ofχcoefficient in each segment.The accuracy of the N-χcoefficient capture decision method to determine the baseband data reverse position is more than 99%for the number of segments N≥4.The proposed method is compared with the ambiguity suppression capture decision method.The simulated results show that N-χcoefficient capture decision method is better than ambiguity suppression capture decision methodin term of capture accuracy or environmental adaptability,verifying the effectiveness of this method in eliminating the ambiguity problem of baseband data reverse position.

关 键 词：通信系统 时分数据调制 基带数据翻转 捕获判决 

分 类 号：TN914.42[电子电信—通信与信息系统]