CAJ | 학술논문

为了提升突发通信中载波频偏估计的性能，降低有效估计的信噪比门限，提出了一种基于奇异值分解去噪的频偏估计方法。首先，该方法将含噪信号根据相应映射转换成矩阵，并对该矩阵进行奇异值分解；其次，将较大的奇异值判定为信号特征予以保留，否则判定为噪声特征置零；接着，根据降噪后的奇异值重构矩阵，恢复成模拟信号；最后，将预处理后的信号进行M&M频偏估计。结果表明，相比于不去噪的频偏估计算法，该方法能够提升估计精度，降低信噪比门限，具有一定的实用性。
위료제승돌발통신중재파빈편고계적성능，강저유효고계적신조비문한，제출료일충기우기이치분해거조적빈편고계방법。수선，해방법장함조신호근거상응영사전환성구진，병대해구진진행기이치분해；기차，장교대적기이치판정위신호특정여이보류，부칙판정위조성특정치령；접착，근거강조후적기이치중구구진，회복성모의신호；최후，장예처리후적신호진행M&M빈편고계。결과표명，상비우불거조적빈편고계산법，해방법능구제승고계정도，강저신조비문한，구유일정적실용성。
In order to improve the performance of carrier frequency offset estimation algorithms in burst-mode communication, and reduce the SNR threshold in effective estimation, a new frequency offset estima-tion method based on singular value decomposition is proposed. Firstly, this method transforms the primal signal into matrix via a relevant reflection, and then implements singular value decomposition of the ma-trix. Secondly, the several fairly large singular values are determined as signal characteristic for reservation or otherwise as noise characteristic turning into zero. Thirdly, based on the new singular values the analog signals are reconfigured . Finally, M&M frequency offset estimation is done on the preprocess signals. Ex-periment results show that, as compared with traditional algorithm, the proposed method could raise the es-timation precision, reduce the SNR threshold, and thus is of certain practical value.