微处理机
微處理機
미처리궤
MICROPROCESSORS
2015年
3期
17-19,23
,共4页
非同步采样%频率偏移%误码率%正交频分复用%接收机%衰减
非同步採樣%頻率偏移%誤碼率%正交頻分複用%接收機%衰減
비동보채양%빈솔편이%오마솔%정교빈분복용%접수궤%쇠감
Non - Synchronized Sampling%Frequency offset%Error rate%OFDM%Receiver%Degradation
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。
在全數字接收機中,載波和時間信息是通過對接收到的連續時間信號進行採樣所得到。在同步採樣的情況下,這些信息被用來使接收機的採樣時鐘與遠程傳輸時鐘相匹配。在非同步採樣繫統中,在接收機耑採樣是通過一種固定的非同步時鐘所執行的,併且附加的後處理在數字化領域完成時序脩正是必要的。主要研究 OFDM繫統中非同步採樣對誤碼率性能的影響。在接收時鐘和髮射時鐘之間,計算給定頻率偏移引起的誤碼率衰減,比較理想的情況下進行取樣,將結果與同步採樣繫統的性能進行比較。
재전수자접수궤중,재파화시간신식시통과대접수도적련속시간신호진행채양소득도。재동보채양적정황하,저사신식피용래사접수궤적채양시종여원정전수시종상필배。재비동보채양계통중,재접수궤단채양시통과일충고정적비동보시종소집행적,병차부가적후처리재수자화영역완성시서수정시필요적。주요연구 OFDM계통중비동보채양대오마솔성능적영향。재접수시종화발사시종지간,계산급정빈솔편이인기적오마솔쇠감,비교이상적정황하진행취양,장결과여동보채양계통적성능진행비교。
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.