基于TK能量算子的OFDM时延估计算法

OFDM time of arrival estimation based on TK energy operator

针对已有正交频分复用(OFDM)信号时延(TOA)估计算法抗噪声能力弱的问题,引入TK能量算子,在旋转不变技术(ESPRIT)算法基础上,提出一种TK-ESPRIT算法进行TOA估计。该算法利用TK算子对瞬时信号变化敏感的特点,首先对信号互相关函数进行处理,使相关函数峰值更加明显;然后构造特征矩阵,利用ESPRIT算法完成TOA估计。仿真结果表明,与已有算法相比,提出算法可以有效提高估计精度。

In order to improve anti-noise performance of OFDM signal TOA estimation, this paper proposed TK-ESPRIT algo-rithm by introducing TK energy operator based on ESPRIT. TK operator could track the instantaneous change of the signal. With this character, TK-ESPRIT algorithm processed the signal correlation function initially and made the correlation function peak more obvious, then built an eigenvalue matrix, and used the ESPRIT algorithm to perform TOA estimation. The simulation results show that TK-ESPRIT algorithm can effectively improve estimation precision compared to currently algorithm.