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An improved channel estimation for underwater acoustic OFDM and COFDM systems

机译：水下声学OFDM和COFDM系统的改进信道估计

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Recently, there has been a tremendous increase in research and development of underwater communication systems. Orthogonal frequency division multiplexing has been widely employed for underwater acoustic communication because of its numerous advantages. Coding as well as interleaving techniques can be used along with orthogonal frequency division multiplexing for improving the error correction capability of the receiver. For demodulating the signal with fairly acceptable accuracies, the channel parameters need to be estimated at the receiver. Channel estimation can be performed by inserting pilots into the sub-carriers of an OFDM symbol. Underwater channels exhibit sparse channel impulse response and hence, the channel can be estimated using the compressive sensing techniques for properly reconstructing the received signals. Dictionary-based sparse channel estimation is presented in this paper which outperforms the channel estimation by LS and MMSE estimations. The results have been compared for various environmental conditions as well as for various numbers of pilots. It has been observed that the number of pilots is to be chosen as a trade-off between channel estimation accuracy and bandwidth efficiency.
机译：最近，水下通信系统的研发巨大增加。由于其许多优点，正交频分复用已广泛用于水下声学通信。编码以及交织技术可以与正交频分复用一起使用以提高接收器的纠错能力。为了以相当可接受的精度解调信号，需要在接收器处估计信道参数。可以通过将导频插入OFDM符号的子载波来执行信道估计。水下信道表现出稀疏通道脉冲响应，因此，可以使用用于适当重建所接收的信号的压缩感测技术来估计信道。本文提出了基于字典的稀疏信道估计，其优于LS和MMSE估计的信道估计。将结果与各种环境条件以及各种数量的飞行员进行了比较。已经观察到，在信道估计准确度和带宽效率之间选择导频的数量作为权衡。

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