摘要
为了克服正交频分复用(Orthogonal Frequency Division Multip lexing,OFDM)系统中时间和频率漂移,提出了一种基于pilot的定时跟踪算法。与基于循环前缀的频偏估计方法向结合,提出了一种适合工程实现的OFDM时频同步环路结构。环路完全利用数据符号中的冗余信息实现时偏和频偏的跟踪,降低了对OFDM同步符号的需求,提高了系统效率。在FPGA上实现了该同步环路,实测曲线证明该方法能够有效的补偿时偏和频偏。
To eliminate the effect of time and frequency drift,a timing tracking loop based on pilot for OFDM system is proposed.It combines frequency offset estimation based on cyclic prefix,and proposes architecture of time-frequency synchronization loop suitable for engineering implementation. The loop completely utilities redundant information in data symbol to track the timing and frequency and meet the requirement of OFDM synchronization symbols,which increases efficiency. Finally,the loop is developed on FPGA. Testing curve shows the method is effective.
出处
《无线电工程》
2013年第12期51-53,共3页
Radio Engineering