OFDM中样值同步算法的研究与仿真

同步技术是OFDM中一项关键技术,样值同步可分为样值定时同步和样值频率同步。由于OFDM系统各子信道带宽较小,各个子载波之间利用正交性来区分,系统对频率同步误差更加敏感。如果发生频率偏移,失去正交性,就会导致严重的符号间干扰和信道干扰,降低系统整体性能。因此,实现频率同步是OFDM系统正常工作的前提。本论文主要对样值频率同步进行研究,分析了样值偏差对OFDM系统性能的影响。在此基础上详细讨论了基于导频的同步算法,并通过仿真验证了算法性能。

Synchronizing technology is the key technologyin OFDMsystem. Sampling synchronization includes sampling frequency synchronization and sampling timing synchronization. Because every subchannel has narrow bandwidth in OFDM system and it distinct the frequency domains with orthogonalization, so the system is more sensitive for the frequency and synchronization error. If frequencies happen to frequency offset, losingorthogonalization, itwillcausesthe great disturb among the frequencies, then reducing the function of whole system. Frequency synchronization is the premise for OFDM working. This thesis is mainly study on the sampling frequency synchronization recovery,it analyzes the synchronization based on pilot frequency in detail, and verificating the algorithm performance by emulation, and giving the simulation result.