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针对稀疏多径的水声OFDM信道,提出了基于叠加训练序列的信道估计方法,能够提高带宽传输效率.在发送端的信息序列中叠加一个低功率的周期性训练序列,在不占用额外的信号带宽的情况下估计信道参数,未知的信息序列会对叠加训练序列的信道估计方法产生干扰,在本文中采用迭代方法提高估计性能.水声信道具有延时时间长,信道稀疏的特点,本文采用匹配跟踪的方法估计信道非零系数的位置,降低加性白噪声对信道估计的影响.仿真结果显示,本文的方法能达到很好的信道估计性能,同时能够降低OFDM的峰均比。
Aiming at the sparse and multipath underwater acoustic OFDM channel, a channel estimation method based on superposition training sequence is proposed, which can improve the bandwidth transmission efficiency. A low-power periodic training sequence is superimposed on the information sequence of the sender, without additional signal bandwidth The unknown information sequence will interfere with the channel estimation method of superposition training sequence.In this paper, the iterative method is used to improve the estimation performance.Water acoustic channel has the characteristics of long delay time and sparse channel. In this paper, matching The tracking method estimates the position of channel non-zero coefficients and reduces the effect of additive white noise on channel estimation.The simulation results show that the proposed method can achieve good channel estimation performance and reduce the OFDM peak-to-average ratio.