一种基于循环前缀的OFDM时频同步新算法

OFDM符号是由多个子载波信号叠加而成,为确保各子载波之间的正交性,就对载波间的同步有很严格的要求,否则将造成信道间干扰和符号间干扰,严重影响OFDM系统的性能。提出一种新的基于循环前缀的OFDM时频同步算法,通过仿真,将新算法和传统的ML算法及集相关算法相比较。仿真结果表明,新算法具有更好的频偏和定时估计性能。

A New Timing and Frequency Synchronization Algorithm Based on Cyclic Prefix in OFDM System

OFDM symbol is a superposition of multiple sub-carrier signals,in order to ensure orthogonality between sub-carriers,the synchronization between the carriers is very strictly required,otherwise it will cause channel interference and ISI,seriously affect the OFDM system performance.A new algorithm based on cyclic prefix in OFDM system is given,by simulation,the new algorithm and the traditional set of ML algorithm and related algorithms are compared.Simulation results show that the new algorithm has better performance of frequency offset and timing estimation.