【作者】 李沁媛； 张群飞； 何成兵； 黄建国；

【Author】 LI Qinyuan;ZHANG Qunfei;HE Chengbing;HUANG Jianguo;College of Marine Engineering,Northwestern Polytechnical University;

【机构】 西北工业大学航海学院；

【摘要】 大时延多径扩展和强环境噪声使得高速率水声通信成为当今最为复杂的无线通信技术之一,基于空间分集的多通道判决反馈均衡器在复杂的水声信道中存在计算量大,可靠度低,对信道适应性差的问题。时反通信技术是近年来水声通信领域的研究热点之一,它可实现低复杂度、高可靠性,并能适应不同海洋信道的高速水声通信。被动时反利用多条独立衰落的信道传输信号,对每条信道进行探测、反转之后估计并抵消了信道多径带来的干扰。最终叠加每条通道的到达信号,目标信号经处理后能量增大,同时不相关的噪声得到了抑制,改进了通信系统性能。对时反通信进行了仿真,结果表明通过时反空间分集处理后,接收端叠加了最强的到达信号,实现聚焦,误码率较单阵元接收时有明显降低。更多还原

【Abstract】 The underwater acoustic communications became one of most sophisticated wireless communication technologies today due to large multipath expansion and strong ambient noise.Decision feedback equalizer based on multichannel spatial diversity has the drawback in series aspects,such as the small computing capacity,low reliability,and poor adaptability.The time reversal communication technology,which has low complexity,high reliability and is adapted to different ocean channel,is one of the most hot research spots in the field of underwater acoustic communications in recent years.By using the signal transmitted over multi independent fading multi channel reversely,each channel is estimated and reversed.Moreover,the interference caused by the multipath expansion is neutralized after the multichannel detect and reverser.The target signal energy is superimposed by stacked each received signal,at the same time,the uncorrelated noise is suppressed.As the result,the communication system performance is optimized obviously.This article simulates the passive time reversal techniques.And results indicate that receiver gets the strongest signal from each channel to achieve focus and lower error rate than single array element receives.更多还原