无线电工程
無線電工程
무선전공정
RADIO ENGINEERING OF CHINA
2011年
11期
1-3
,共3页
多载波CDMA%时偏%均值%方差
多載波CDMA%時偏%均值%方差
다재파CDMA%시편%균치%방차
multicarrier CDMA%time offset%mean%variance
提出了一种估计低信噪比频偏多载波码分多址接入(MC-CDMA)系统定时偏差的新方法,通过采用一个特殊的PN序列,利用得到的时域序列具有的模最大值性和共轭对称性,同时采取峰值自叠加处理方法来确定定时同步起始位置。在高斯和多径衰落信道下进行了仿真,采用定时偏移的均值(mean)和均方误差(MSE)来衡量新算法的性能,验证了新算法的优良性能。
提齣瞭一種估計低信譟比頻偏多載波碼分多阯接入(MC-CDMA)繫統定時偏差的新方法,通過採用一箇特殊的PN序列,利用得到的時域序列具有的模最大值性和共軛對稱性,同時採取峰值自疊加處理方法來確定定時同步起始位置。在高斯和多徑衰落信道下進行瞭倣真,採用定時偏移的均值(mean)和均方誤差(MSE)來衡量新算法的性能,驗證瞭新算法的優良性能。
제출료일충고계저신조비빈편다재파마분다지접입(MC-CDMA)계통정시편차적신방법,통과채용일개특수적PN서렬,이용득도적시역서렬구유적모최대치성화공액대칭성,동시채취봉치자첩가처리방법래학정정시동보기시위치。재고사화다경쇠락신도하진행료방진,채용정시편이적균치(mean)화균방오차(MSE)래형량신산법적성능,험증료신산법적우량성능。
A new method to estimate the timing offset in the MC-CDMA system with low SNR and frequency offset is proposed.In this new method,the initial position of timing synchronization is determined by using a special PN sequence,the modulus maximum and the conjugate symmetry of time domain sequence and the peak self-superposability processing method.The simulation is done in the AWGN and the multipath fading channel.In the simulation,the mean and MSE of timing offset are used to estimate the performance of new algorithm.The results show that the new method is effective in contacting noise.