一种基于小数倍多普勒信道的 OTFS 信道估计方法.

OTFS channel estimation method based on fractional Doppler channel.

A matched filtering (SMF) channel estimation method based on sequence pilots can solve the problem of difficulty and high complexity in channel estimation for existing orthogonal time-frequency-space (OTFS) modulation systems in terms of peak to average ratio and fractional Doppler channels. This algorithm first combines the sequence pilot and data into a frame, and obtains the number of paths, delay, and integer Doppler based on the correlation of the sequence. Then, it estimates the fractional Doppler tap and channel gain through matched filtering to obtain channel state information. Finally, the channel gain and initial phase are updated through channel features. The simulation results show that this method improves the peak to average ratio and channel estimation performance compared to channel estimation based on embedded pulse pilots. Compared to traditional sequence pilots, this method can estimate fractional Doppler taps and provide more accurate channel state information. This channel estimation method is more universal. [ABSTRACT FROM AUTHOR]

针对现有正交时频空(OTFS)调制系统的信道估计中存在的高峰均比和小数倍多普勒信道下估计困难 及复杂度高的问题,提出了一种基于序列导频的匹配滤波(SMF)信道估计方法。该算法首先将序列导频与数据 联合成帧,依靠序列的自相关性获取路径数、时延和整数倍多普勒;然后通过互相关匹配滤波估计小数倍的多普 勒抽头和信道增益,从而得到信道状态信息;最后根据小数倍信道整数采样的特征,更新信道增益和信道初始相 位。仿真结果表明,该方法相比基于嵌入式脉冲导频的信道估计,改善了峰均比,并提高了信道估计性能。相比 于传统的序列导频,该方法可以估计得到小数倍多普勒抽头,估计的信道状态信息更准确。该信道估计方法更 具有普遍性。 [ABSTRACT FROM AUTHOR]