摘要
直接序列扩频提供了一种低信噪比条件下水声通信的有效手段,但在低信噪比条件下直扩系统常用的信道均衡,rake接收机等抑制多径干扰方法性能下降。该文结合具有突出时间、空间聚焦能力的多通道被动时间反转技术与直接序列扩频抑制低信噪比条件下多径干扰的影响,并采用卷积纠错编码进一步提高通信性能。湖试结果证明了该技术方案的有效性。
Direct Sequence Spread Spectrum （DSSS） provides an effective way for underwater acoustic communication under low Signal-to-Noise Ratio （SNR）. However, low SNR will deteriorate the common multi-path mitigation approaches employed in DSSS system such as channel equalizer and rake receiver. Considering that multi-channel time reversal has the ability to refocus the energy in spatial and temporal domain, multi-channel time reversal is incorporated with DSSS technology to suppress the multipath interference under low SNR, also convolutionM coding is adopted to further improve the communication performance. Lake trial results show the effectiveness of the proposed scheme.
出处
《电子与信息学报》
EI
CSCD
北大核心
2012年第7期1685-1689,共5页
Journal of Electronics & Information Technology
基金
国家自然科学基金(10704063)
福建省自然科学基金(2011J01275)资助课题
关键词
水声通信
多通道时间反转
直接序列扩频
卷积编码
Underwater acoustic communication
Multi-channel time reversal
Direct Sequence Spread Spectrum （DSSS）
ConvolutionM coding
