低复杂度单载波频域Turbo均衡水声通信技术

席 瑞; 党谦谦; 何成兵; 张瑞玉; 张群飞

doi:10.11993/j.issn.2096-3920.2018.05.003

低复杂度单载波频域Turbo均衡水声通信技术

doi: 10.11993/j.issn.2096-3920.2018.05.003

西北工业大学航海学院, 陕西西安, 710072

基金项目: 国家重点研发计划(2016YFC1400200)、国家自然科学基金项目(61471298, 61771396).

详细信息

作者简介:
席瑞(1996-), 男, 在读硕士, 主要研究方向为水声通信.

中图分类号: TJ630.34; TN929.3
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出版历程
- 收稿日期: 2017-08-09
- 修回日期: 2017-09-10
- 刊出日期: 2018-10-31

Underwater Acoustic Communication Technology Adopting Low Complexity Single Carrier Frequency-Domain Turbo Equalization

School of Marine Science and Technology, Northwestern Polytechnical University, Xi’an 710072, China

摘要

摘要: 浅海水声通信具有严重多径扩展、衰落以及低信噪比的特点。为克服常规时域判决反馈均衡器计算量大和对接收机参数敏感的不足, 基于扩频码的单载波块传输结构提出了一种适用于稀疏水声信道的低复杂度频域Turbo迭代均衡方法。发射端数据块之间插入扩频码作为循环前缀。接收端利用已知扩频码进行稀疏信道估计以及对由多普勒偏移引起的旋转相位进行估计, 并采用基于最小均方误差准则下的频域Turbo均衡技术和多通道联合处理方法消除多途效应产生的码间串扰, 显著改善了系统性能。通过湖上试验验证, 在通信距离为10.8 km条件下, 采用QPSK和8PSK调制方式分别实现了3 kbps和4.5 kbps的有效数据率的水声通信, 并在3次迭代均衡之下均实现了无误码传输。文中所做工作可为高数据率稳健水声通信研究提供参考。
- 水声通信 /
- 单载波频域 /
- 稀疏信道估计 /
- 频域Turbo迭代均衡
Abstract: Underwater acoustic communication in shallow sea has the characteristics of severe multipath delay spread, channel fading and low signal-to-noise ratio(SNR). To overcome the high computation complexity and high sensitivity to receiver parameters of conventional time-domain decision feedback equalizer, a low complexity frequency-domain Turbo iterative equalization method is proposed for sparse underwater communication channel, which is based on single-carrier block transmission structure with spreading codes. At the transmitter spreading codes are inserted between data blocks as the cyclic prefixes. At the receiver known spreading codes are employed to estimate the sparse channel and the rotational phase caused by Doppler shift, then the frequency-domain Turbo equalization technique based on the minimum mean square error criteria and the multichannel joint processing method are used to eliminate the intersymbol interference(ISI) caused by the multipath effect. The performance of the system is improved significantly. Lake test shows that the underwater communication with effective data rates of 3 kbps and 4.5 kbps is achieved via QPSK and 8PSK modulation, respectively, at a communication distance of 10.8 km, and error-free transmission is always achieved in three times of iterative equalization. This study may provide a reference for the research of robust underwater acoustic communication with high data rate.
- underwater communication /
- single carrier frequency domain /
- sparse channel estimation /
- frequency-domain turbo iterative equalization

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