摘要
提出了一种适合无线衰落信道的剩余载波频偏估计新算法.该算法利用估计出的各个子信道信噪比,选择出高质量子信道,再利用这些高质量子信道上的判决数据,联合导频子载波上的数据共同估计剩余载波频率偏移.新算法具备导频辅助估计(PTA)算法和判决数据导向(DD)算法的优点.仿真结果表明,当平均信噪比大于10dB时,新算法的估计精度比PTA算法提高了至少3倍,比DD算法提高了至少20倍.
A new residual carrier frequency offset（RCFO） estimation method is proposed for orthogonal frequency division multiplexing（OFDM） systems in wireless fading channel. In the method, the SNRs on all the sub-carriers are estimated and used to select high quality sub-channels. And then the hard decision data on the high quality sub-channels are combined with the pilot data to estimate the RCFO. The new method has the advantages of both pilot tone assisted （PTA） and decision directed （DD） methods. Simulation results show that the estimation accuracy of the proposed method has an improvement at least 4 times better than that of the PTA method, and at least 21 times better than that of the DD method when the SNR is more than 10 dB.
出处
《西安电子科技大学学报》
EI
CAS
CSCD
北大核心
2008年第2期201-205,共5页
Journal of Xidian University
基金
国家部委重点实验室基金资助(51473020105DZ0103)
国家部委基金资助(9140A24030206DZ0115)
陕西省自然科学基金资助(2006F28)
国家自然科学基金资助(60602063)
关键词
正交频分复用
剩余载波频偏
导频辅助估计算法
判决数据导向算法
orthogonal frequency division multiplexing （OFDM）
residual carrier frequency offset （RCFO）
pilot tone assisted（PTA） method
decision directed（DD） method
