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一种用于遥测多符号检测的位同步算法
A symbol timing synchronization algorithm for multiple symbol detection in range telemetry
投稿时间:2018-03-28  修订日期:2018-04-19
中文关键词:多符号检测  遥测接收机  位同步  误比特率性能  Gardner算法
英文关键词:Multi-Symbol Detection  range telemetry receiver  symbol timing synchronization  Bit Error Rate performance  Gardner algorithm
基金项目:中央高校基本科研业务费资助项目(BLX201623);国家自然科学基金资助项目(31700479;91438116)
作者单位
周 游 School of Electronic and Information EngineeringBeihang UniversityBeijing 100191China 
刘荣科 School of Electronic and Information EngineeringBeihang UniversityBeijing 100191China 
段瑞枫 School of Information Science and TechnologyBeijing Forestry UniversityBeijing 100083China 
蒋伯峰 Beijing Xinwei TelecomBeijing 100193China 
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中文摘要:
      为使现有遥测脉冲编码调制/调频(PCM/FM)系统中的定时同步环路可直接用于多符号检测(MSD),从而降低系统的复杂度,提出了一种适用于遥测PCM/FM MSD的位同步算法。该算法采用MSD的似然比作为定时估计的统计变量,据此可直接利用传统PCM/FM限幅鉴频接收机中的定时同步环路来实现位同步。与传统的基于“迟早门”的MSD位同步算法相比,所提算法节省了一个MSD支路的运算,极大降低了接收机存储和计算资源。此外,所提算法采用Gardner算法作为定时误差检测单元,便于高速实现;所提算法的定时估计误差的归一化方差在低信噪比区仍小于0.01,满足遥测接收机的要求,且误比特率(BER)性能与理想同步情况相比,几乎没有损失。
英文摘要:
      Applying the timing recovering loop for PCM/FM to Multi-Symbol Detection(MSD) could reduce the complexity of the whole system. This paper proposes a symbol timing synchronization algorithm for MSD in telemetry Pulse-Code Modulation/Frequency Modulation(PCM/FM) system. The proposed algorithm uses the likelihood ratio of MSD as the statistical variable for timing estimation, and can adopt traditional timing synchronization loop in PCM/FM using limiting amplitude and frequency discrimination to achieve symbol synchronization. Compared with the traditional MSD symbol timing synchronization method based on the “early-late gate”,the proposed method saves the operation of a branch of MSD, which greatly reduces the storage and computing resources in receiver. In addition, the proposed algorithm adopts the Gardner algorithm as a timing error detection unit, which facilitates high speed implementation in practical systems. The normalized variance of the timing estimation error in the proposed method is still less than 0.01 in the low SNR region, which satisfies the requirements of the telemetry receiver. Compared with the ideal synchronization situation, the proposed algorithm has almost no loss in terms of Bit Error Rate(BER) performance, and has a promising prospect.
引用本文:周 游,刘荣科,段瑞枫,蒋伯峰.一种用于遥测多符号检测的位同步算法[J].太赫兹科学与电子信息学报,2019,17(3):385~389
DOI:10.11805/TKYDA201903.0385
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