摘要
随着海洋资源的利用和开发,人们对高速率水下通信的需求也更加迫切。但水下环境的高频衰减特性和强噪声导致水下信号的传输带宽受限,信号传输速度较慢。同时现有的水下节点间通信通常采用碰撞避免的MAC协议,在一个时隙内只允许一个有效用户发送数据,因而水声信道的利用率较低。针对上述问题,提出了一种同频时反水下协作通信系统的自信息干扰消除算法。在该水下协作通信系统中,节点可同时通过水下基站向对方发送数据,节点之间共用相同的上行频率和下行频率,实现频谱资源复用。该方法中通过在基站处进行主动时反,消除水声信道传输的多径效应,然后利用节点对自身发射信号已知的特点,消除基站转发信息中的自信息干扰。仿真结果表明,文中所提出方法的误码性能与现有的分时协作通信方法相当,在信噪比为11 d B时,误码率均可以达到10-3,但该方法的传输速度为分时水下协作通信方法的2倍。
Recently,with the development of Marine exploration,the need for high speed underwater communication is growing rapidly. However,information transmission rate is low,because of the limited bandwidth caused by high attenuation for high frequency acoustic signal and great noise in low frequency band. To this end,a self-interference cancellation algorithm in underwater cooperative communication is proposed. In this underwater cooperative communication system,underwater nodes could transmit to each other through underwater base station at the same time. Moreover,common uplink frequency and downlink frequency are adopted to reuse the frequency spectrum and improve the transmission efficiency. In this algorithm,active time reverse is adopted to mitigate the multipath effect in underwater acoustic transmission and then take advantage of the known characteristic of self-information,the selfinterference could be cancelled. Simulation results show that,the bit error ratio performance is similar to existing time division cooperative communication,and may double the transmission rate.
作者
张玲玲
黄建国
唐成凯
张群飞
Zhang Lingling Huang Jianguo Tang Chengkai Zhang Qunfei(School of Marine Science and Technology, Northwestern Polytechnical University, Xi＇an 710072, China School of Electronics Engineering, Northwestern Polytechnical University, Xi＇an 710072, China)
出处
《西北工业大学学报》
EI
CAS
CSCD
北大核心
2016年第5期823-828,共6页
Journal of Northwestern Polytechnical University
基金
国家自然科学基金(61271415
61471298
61531015)
水下信息处理与控制国家重点实验室基金(9140C231002130C23085)
西北工业大学博士论文创新基金(CX201230)
西北工业大学基础研究基金--中央高校基本科研业务费专项基金(3102014JCQ01010)资助
关键词
水声通信
水下协作通信
时反通信
频率复用
自干扰消除
underwater acoustic communication
underwater cooperative communication
time reverse
frequency reuse
self Interference cancellation
