宽带OQPSK信号实时多域测试定时同步技术研究  

Joint timing synchronization algorithm for OQPSK real-time multi-domain analysis

作　　者：阎啸[1] 王茜[2] 秦开宇[2] 

机构地区：[1]电子科技大学自动化工程学院,成都610054 [2]电子科技大学空天科学技术研究院,成都610054

出　　处：《电子测量与仪器学报》2009年第10期48-54,共7页Journal of Electronic Measurement and Instrumentation

基　　金：国家自然科学基金(编号:60672029)资助项目

摘　　要：提出了一种全新的宽带OQPSK信号实时多域分析架构,该架构能够同时实现宽带OQPSK通信信号实时多域联合分析和高精度指标测试。在此基础上,提出并详细讨论了一种面向测试的高精度宽带OQPSK通信信号联合定时同步算法。该算法采用基于多相滤波的任意倍数重采样器和基于最大似然估计(ML)的前馈载波相位和定时误差估计算法,通过对任意码率的被测OQPSK信号连续处理,快速实现高精度符号定时同步。该算法避免了OQPSK解调中载波同步和符号定时同步之间的相互影响和制约。经仿真验证,和传统的基于Lagrange插值的重采样算法相比较,具有更好的频谱抑制性能和更高的变换精度。结合载波相位误差和定时误差联合估计,快速实现了OQPSK信号高精度符号定时同步。Based on the frame of real-time multi-domain signal analysis for wideband Offset Quadrature Phase Shift Keying （OQPSK） communication, a novel high-precision joint timing synchronization algorithm for OQPSK real-time multi-domain analysis and target test is presented. Firstly, the proposed two-step algorithm adjusts the sampling rate of input measured OQPSK signal to integer multiple of the symbol rate by the arbitrary ratio re-sampling algorithm based on multiphase filtering. Then, the feedforward joint phase and timing estimation algorithm for OQPSK, which is derived using maximum-likelihood （ML） arguments, is applied to remove the carrier phase offset and the timing error simultaneously. Compared with the conventional Lagrange interpolator, the proposed algorithm has better out-of-band spectrum suppression performance. The simulation proved the flexibility and high efficiency of the proposed algorithm.

关 键 词：偏移正交相移键控 实时多域分析 多相滤波 任意倍数重采样 最大似然估计 

分 类 号：TM935.21[电气工程—电力电子与电力传动]