| 马雪飞,赵春晖,乔钢.OFDM水声通信线性最小均方误差算法信道均衡[J].声学技术,2009,(4):467~471 |
| OFDM水声通信线性最小均方误差算法信道均衡 |
| Channel equalization of orthogonal frequency division multi-plexing underwater communication based on linear minimum mean square error |
| 投稿时间：2008-12-09 修订日期：2009-03-17 |
| DOI： |
| 中文关键词: 水声通信 信道均衡 调频信号 正交频分复用 线性最小均方误差估计 |
| 英文关键词: underwater communication channel equalization chirp orthogonal frequency division multiplexing linear minimum mean square error |
| 基金项目: |
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| 中文摘要: |
| 正交频分复用在高速水声通信中的应用越来越广泛。水声信道是多径、高噪声的衰落信道。由于信道条件差,容易产生码间干扰,信道均衡技术是提高通信系统性能的重要技术。提出了线性最小均方估计在水声通信系统中应用的方案,研究了实际通信中利用调频信号如何确定信号的平均多径时延、最大多径时延,比较了不同调频信号测量信道的性能。该方案基于导频辅助均衡方法,利用调频信号测量信道,获得的信道统计信息,计算信道的自相关矩阵。从而根据线性最小均方误差算法进行信道均衡。通过仿真和湖试进行验证,结果表明该方案效果较好,对系统性能改善比较明显。 |
| 英文摘要: |
| Applying orthogonal frequency division multiplexing technology to sound signal transmission over an underwater channel is getting wider and wider. Underwater channel is a Doppler-distorted, high noise, time-varying multi-path channels. Channel Equalization plays a key role in coherent modulation orthogonal fre-quency division multiplexing systems. In this paper, a pilot-assisted underwater orthogonal frequency division multiplexing channel equalization approach based on Linear Minimum Mean Square Error is proposed, chirp signals are applied to obtaining the max multi-path time delay and the mean multi-path time delay of the channel, and the performances of three kind of chirp signals are compared experimentally. The auto-correlation matrix of the channel is calculated, and the processed result is used in the linear minimum mean square error equalization algorithm. The simulations and lake trial show the good performance of this method. |
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