肖芳贵,
许肖梅,
1.厦门大学海洋与地球学院 厦门 361102
2.厦门大学水声通信与海洋信息技术教育部重点实验室 厦门 361102
基金项目:国家自然科学基金(41976178, 41676024)
详细信息
作者简介:涂星滨：男，1989年生，博士生，研究方向为水声通信与信号处理
肖芳贵：男，1995年生，硕士生，研究方向为水声通信与信号处理
许肖梅：女，1960年生，博士，教授，研究方向为水声遥测遥控、水声通信、水声网络
通讯作者:许肖梅 xmxu@xmu.edu.cn
中图分类号:TN929.3计量
文章访问数:448
HTML全文浏览量:147
PDF下载量:56
被引次数:0
出版历程
收稿日期:2020-07-23
修回日期:2020-12-07
网络出版日期:2020-12-15
刊出日期:2021-03-22
A Novel Single-Carrier Frequency-Domain Equalization Technique without Prefix or Suffix for Underwater Acoustic Communications
Xingbin TU,Fanggui XIAO,
Xiaomei XU,
1. College of Ocean and Earth Sciences, Xiamen University, Xiamen 361102, China
2. Key Laboratory of Underwater Acoustic Communication and Marine Information Technology, Xiamen University, Xiamen 361102, China
Funds:The National Natural Science Foundation of China (41976178, 41676024)
摘要
摘要:单载波频域均衡(SC-FDE)是水声通信中实现高数据率传输的重要技术之一，但传输序列中周期性插入的循环前缀或保护间隔等前后缀降低了频带利用率和通信速率。该文在时间反转(TR)处理的基础上提出一种新型无前后缀的水声单载波频域均衡技术，即发射机传输无前后缀的单载波信号，接收机对各个数据块的后缀进行重构并利用频域均衡技术消除符号间干扰。重构数据块后缀作为接收机的核心部分，主要包括3个步骤：TR处理、干扰消除和后缀重构。首先，TR处理将来自接收阵元的多通道信号融合为单通道信号，并且其等效信道冲激响应(即q函数)的稳定主峰避免了后缀重构中的噪声放大。然后，通过干扰消除，去除来自前一数据块的块间干扰(IBI)和来自当前数据块的反因果干扰(ACI)。最后，根据q函数主峰及其右侧的因果部分计算信号的各个路径分量，实现数据块的后缀重构。实验结果验证了这一技术的有效性，并且性能优于现有无前后缀的单载波频域均衡技术。
关键词:水声通信/
单载波/
频域均衡/
前后缀/
时间反转
Abstract:Single-Carrier Frequency-Domain Equalization (SC-FDE) is one of the key techniques to achieve high data-rate transmissions in underwater acoustic communications. However, the periodically inserted prefixes or suffixes, in forms of cyclic-prefixes or guard intervals in transmission sequence, reduce the bandwidth efficiency and data rate. A SC-FDE technique without prefix or suffix is proposed based on the Time Reversal (TR) for underwater acoustic communications. At the transmitter side, the single-carrier signal without prefix or suffix is transmitted. At the receiver side, the suffix is reconstructed in each block before canceling the intersymbol interference with FDE. The suffix reconstruction, which is the core of receiver, contains three main procedures: the TR processing, interference cancelation, and suffix reconstruction. First, the TR processing converts receptions from an array of receiving elements into a single composite signal. The equivalent impulse response (namely the q-function) has a stable peak, which avoids the noise amplification. Next, the interference cancelation is conducted to remove the InterBlock Interference (IBI) from the previous block and the ACausal Interference (ACI) from the current block. Afterward, suffix reconstruction is achieved by calculating the multipath arrivals of each symbol, which are obtained from the causal part of the q-function. Experimental results validate the effectiveness of this technique and its superiority over the SC-FDE technique without prefix or suffix in the current literature.
Key words:Underwater acoustic communication/
Single carrier/
Frequency-Domain Equalization (FDE)/
Prefix and suffix/
Time Reversal (TR)
PDF全文下载地址:
https://jeit.ac.cn/article/exportPdf?id=c398ad5d-d19e-4598-a454-a9907551dde6
