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针对未来长期演进上行链路中单载波频分多址(SC-FDMA)系统对相位噪声敏感的特性,提出基于马氏距离的残余相位噪声抑制算法.使用SC-FDMA系统中的导频序列对相位噪声进行初步估计补偿之后,残余的相位噪声服从高斯分布.该算法利用残余相位噪声的统计分布信息来计算接收符号到各个星座符号之间的马氏距离,再选取马氏距离取得最小值时对应的星座符号作为发送符号的估计.仿真结果表明:该算法能很好地消除残余相位噪声的影响,降低接收端恢复数据的误符号率,提高系统性能.
In view of the phase noise-sensitive characteristics of single-carrier frequency division multiple access (SC-FDMA) system in the future long-term evolutionary uplink, a novel residual phase noise suppression algorithm based on Mahalanobis distance is proposed. Using the pilot sequence pairs in SC-FDMA After the phase noise is estimated and compensated, the residual phase noise obeys the Gaussian distribution. The algorithm uses the statistical distribution information of residual phase noise to calculate the Mahalanobis distance between the received symbol and each constellation symbol, and then obtains the minimum Mahalanobis distance The corresponding constellation symbols are used as the estimation of the transmitted symbols.The simulation results show that the proposed algorithm can eliminate the influence of residual phase noise and reduce the symbol error rate of the recovered data at the receiving end to improve the system performance.