A low-complexity orthogonal time frequency space modulation method for underwater acoustic communication

被引：1
作者：
Zhang Y. [1 ,2 ]
Zhang Q. [1 ,2 ]
Wang Y. [1 ,2 ]
He C. [1 ,2 ]
Shi W. [1 ,2 ]
机构：
[1] Research & Development Institute of Northwestern Polytechnical University in Shenzhen, Northwestern Polytechnical University, Shenzhen
[2] School of Marine Science and Technology, Northwestern Polytechnical University, Xi'an
来源：
Xibei Gongye Daxue Xuebao/Journal of Northwestern Polytechnical University | 2021年 / 39卷 / 05期
关键词：
Delay-Doppler channel matrix; Infinite-norm constraint; Optimal coordinate descent; Orthogonal time frequency space; Underwater acoustic communication;
D O I：
10.1051/jnwpu/20213950954
中图分类号：
学科分类号：
摘要：
Compared with the orthogonal frequency division multiplexing (OFDM) modulation, the orthogonal time frequency space(OTFS) modulation has a lower peak-to-average power ratio. It can effectively resist the time selective fading caused by the Doppler effect and has significant performance advantages over doubly dispersive channels. However, the conventional OTFS linear minimum mean square error (LMMSE) method has a high complexity and is not easy to process in real time. In order to solve this problem, we propose a low-complexity equalization algorithm with infinite norm constraints based on the optimal coordinate reduction. The equalization algorithm not only obtains the optimal solution through a certain number of iterations and avoids direct matrix inversion but also equalizes infinite norm constraints to improve the symbol detection performance gains. At the same time, the OTFS delay-Doppler channel matrix we utilize is sparse and the two-norm squares of each column vector equally reduces the complexity of optimal coordinate descent. Finally, the simulation in the underwater acoustic communication scenario we designed verify the effectiveness of the proposed equalization algorithm. The simulation results show that the performance of the proposed equalization algorithm is close to that of the LMMSE method, while its low complexity is ensured. © 2021 Journal of Northwestern Polytechnical University.
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收藏
页码：954 / 961
页数：7
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