采用非同步采样 OFDM系统的误码率性能分析

摘要

In full -digital receivers,the information of the carrier wave and timing is derived from samples of the received continuous -time signal.In case of synchronized sampling,this information is used to align the sampling clock of the receiver with the remote transmit clock.In non -synchronized sampling systems,the sampling at the receiver is performed by means of a fixed free -running clock,and additional post -processing is necessary to perform timing correction in the digital domain.We investigate the effect of non -synchronized sampling on the BER performance of OFDMsystems.The BER degradation, caused by a given frequency offset between receiver and transmitter clock,is calculated.Under the ideal sampling,the obtained results are compared with the performance of synchronized sampling systems.%在全数字接收机中，载波和时间信息是通过对接收到的连续时间信号进行采样所得到。在同步采样的情况下，这些信息被用来使接收机的采样时钟与远程传输时钟相匹配。在非同步采样系统中，在接收机端采样是通过一种固定的非同步时钟所执行的，并且附加的后处理在数字化领域完成时序修正是必要的。主要研究 OFDM系统中非同步采样对误码率性能的影响。在接收时钟和发射时钟之间，计算给定频率偏移引起的误码率衰减，比较理想的情况下进行取样，将结果与同步采样系统的性能进行比较。