一种基于滤波多音系统的半盲同步算法

摘要

A new timing synchronous algorithm for Filtered MultiTone (FMT) system is proposed based on investigation for FMT character. The method achieved good performance with shorter train sequence for getting synchronous symbols by linking the correlation of the FMT symbols to the strong autocorrelation of PN sequence. Otherwise, a simple effective estimation for carrier frequency offset is introduced which is a integer multiple of sub-carrier spacing. The simulation results show that these two algorithms perform well in the additive Gaussian noise channel, and obtain a good estimate performance in the Doppler shift of the Rayleigh channel with diversity techniques.%　　该文在研究滤波多音(Filtered MultiTone, FMT)调制性质的基础上，给出了一种新的 FMT 系统定时同步算法。该算法将 FMT 符号的相关性和 PN 序列强自相关性结合，在保证算法性能的同时，大大缩短了构造同步符号所需训练序列的长度。此外，该文还提出了一种简单有效的整数倍子载波间隔频偏的估计算法。仿真结果表明，这两种算法在加性高斯噪声信道中性能优良，结合分集技术在多普勒频移的瑞利信道下也获得良好的估计性能。