| 褚润聪,武岩波,朱敏.基于向量近似消息传递均衡的超奈奎斯特水声通信*[J].,2025,44(2):441-453 |
| 基于向量近似消息传递均衡的超奈奎斯特水声通信* |
| Vector approximate message passing equalization based faster-than-Nyquist underwater acoustic communication |
| 投稿时间：2023-10-23 修订日期：2025-03-07 |
| 中文摘要: |
| 高阶调制超奈奎斯特信号可以提高水声通信系统的频谱效率。为消除干扰需要进行多普勒时频偏移补偿和符号均衡。为此提出基于相关峰Sinc插值的连续定时估计方法，估计每个接收符号时变多普勒定时偏移量，通过多普勒补偿后使每帧数据的信道近似时不变。并提出基于噪声重构的向量近似消息传递信道估计Turbo均衡，利用信道估计值来重构噪声并计算噪声方差，通过内外两层迭代来挖掘符号间的约束增益，抑制符号间干扰。距离为900 m的垂直水声通信海试结果表明，采用所提方法可以实现频谱效率为1.85 bits/(s·Hz)的超奈奎斯特信号无差错传输。 |
| 英文摘要: |
| High order modulation faster-than-Nyquist technology can improve the spectral efficiency of underwater acoustic communication systems. To eliminate interference, Doppler time-frequency offset compensation and symbol equalization are required. Therefore, a continuous timing estimation method based on correlation peak Sinc interpolation is proposed, which compensate for the time-varying Doppler effect of each received symbol, making the channel experienced by each data frame after compensation approximately unchanged in time. And a Turbo equalization based on noise reconstruction vector approximate message passing is proposed, which uses estimated channel to reconstruct noise and calculate noise variance. The constraint gain between symbols is mined through inner and outer layers of iteration to suppress inter symbol interference. The sea experiment results of vertical underwater acoustic communication at a distance of 900 meters show that the proposed method can achieve error free transmission of faster-than-Nyquist signals with a spectral efficiency of 1.85 bits/(s·Hz). |
| DOI：10.11684/j.issn.1000-310X.2025.02.019 |
| 中文关键词: 水声通信 高阶调制 超奈奎斯特 Turbo均衡 消息传递 |
| 英文关键词: Underwater acoustic communication Higher-order modulation Faster-than-Nyquist Turbo equalization Message passing |
| 基金项目:国家自然科学基金项目（面上项目，重点项目，重大项目）,中国科学院战略性先导科技专项，国家重点基础研究发展计划（973计划） |
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