Pattern时延差编码四信道水声通信技术研究

Study of 4-channel underwater acoustic communication based on pattern time delay shift coding system

本文所研究的是基于Pattern时延差编码(PDS)体制下的水声通信技术。PDS水声编码体制利用Pattern码片出现在码元窗的时延差值进行时延编码,通过码元分割,有效的降低了水声信道的多途干扰;通过频率分割划分四个通信信道,增加通信速率至1000bit/s。在接收端利用带通滤波器来实现通信信道分割,每个信道再应用拷贝相关器实现码元分割并估计出时延差值,完成译码。仿真实验表明,该系统适合于大量不同水声信道高可靠性工作,为水声通信网络化打下坚实基础。

The underwater acoustic communication based on the Pattern Time Delay Shift （PDS） system is studied. PDS system uses the time delay shift values of the pattern to code the information. The system decreases the multi-path interference by code division, and has 4 communication channels by frequency division. The rate of communication is 1000bits/s. The receiver separates the channels by means of band-path filters, and performs decoding by 4 correlators to estimate the time delay shift. The simulation experiments show that the PDS system could adapt many underwater acoustic channels for high data rate and high reliability. This study provides the foundation for underwater acoustic networks.