华中科技大学学报：自然科学版2011，Vol.39Issue(10)：79-82,4.
多径信道下的OFDM信号带宽盲估计
Bandwidth blind estimation of OFDM signals in multipath channels
摘要
Abstract
Traditional orthogonal frequency division multiplexing（OFDM） bandwidth estimation scheme can not achieve accurate estimation results at low signal noise ratios（SNRs） and in multipath channels,besides,it acquires a great mount of computation.To deal with these problems,a new bandwidth estimation scheme of OFDM signals was proposed.Firstly,the autoregressive（AR） model was established according to the received OFDM signals,and the power spectrum density could be computed with the AR model.Secondly,the power spectrum density was equivalent to a rectangular spectrum whose bandwidth was used as the bandwidth of OFDM signals.Finally,it was repeated many times and the statistical average value was used as the final bandwidth estimation value.Simulation results show that bandwidth estimate scheme with estimation error has only 1.68% at GSNR=0 dB and in multipath channels.So the new scheme not only has higher precision at low SNR and in multipath channels but also has lower computational complexity.关键词
正交频分复用/参数估计/带宽估计/多径信道/自回归模型/矩形谱Key words
orthogonal frequency division multiplexing（OFDM）/parameter estimate/bandwidth estimate/multipath channels/autoregressive（AR） model/rectangular spectrum分类
信息技术与安全科学引用本文复制引用
刘明骞,李兵兵,王婧舒..多径信道下的OFDM信号带宽盲估计[J].华中科技大学学报：自然科学版,2011,39(10):79-82,4.基金项目
国家高技术研究发展计划资助项目 （）
国家自然科学基金资助项目 （）
高等学校学科创新引智计划资助项目 （）
