论文部分内容阅读
同步是正交频分复用(OFDM,Orthogonal Frequency-Division Multiplexing)系统研究的关键问题之一,本文主要研究了基于循环前缀(CP,Cyclic Prefix)的OFDM系统定时同步方法。传统的基于循环前缀的OFDM系统定时同步方法只局限于在一个符号内进行相关运算,同步效果不够理想,而且在多径信道存在的情况下循环前缀的长度大都比较长才能正确确定符号定时点,降低了传输效率。本文提出了一种扩展的多符号联合定时同步算法,仿真结果显示,改进后的方法提高了传输速率,在符号同步估计性能较原始方法有显著的提高。
Synchronization is one of the key issues in Orthogonal Frequency-Division Multiplexing (OFDM) systems. This paper mainly studies the OFDM system timing synchronization method based on Cyclic Prefix (CP). The traditional cyclic prefix-based OFDM system timing synchronization method is limited to performing correlation operations within a symbol, the synchronization effect is not ideal, and in the case of multipath channels, the length of the cyclic prefix is usually longer in order to correctly determine the symbol timing point, Reduce the transmission efficiency. In this paper, an extended multi-symbol joint timing synchronization algorithm is proposed. The simulation results show that the improved method improves the transmission rate and significantly improves the performance of symbol synchronization estimation compared with the original method.