| Title | Researching on Signal Synchronization and Detection in Underwater Communication Network Based on FH-CDMA |
| Abstract | Recently,underwater communication network has attracted significant attention of many countries,and becomes research focus of international underwater acoustic (UWA) technology field.The UWA channel is a complex random channel,which has variable parameter and multi-path transmission.So it is difficult to realize the UWA communication with low BER and high data rate.Hence,building a proper,rapid and low power dissipation UWA network,which is based on UWA communication technology with high BER,low data rate and long time-delay,is a more challenging and complex subject in UWA technology field.According to the need of data transmission in shallow water acoustic network communication,this thesis focuses on network frequency-hopping(FH) synchronization system.A synchronization system was designed that makes fast, exact synchronizing and has good performance on anti-interference,reliability and also is easy to realize.Moreover,it can detect the weak synchronization signals in low SNR situation.Firstly,the paper analyzed the characteristic of SWA channel,and built the UWA channel model;it described the basic principle of spread spectrum communication especially FH communication,then analyzed the applicability of the existing FH system synchronization methods in UWA channel;based on the theory,it discussed the time-frequency synchronization and LFM signal synchronization,and obtained their simulation results,furthermore,it also researched the frame synchronization and weak signal detection;besides,a new scheme of LFM with time-frequency synchronization was proposed that fuse the advantages of time-frequency synchronization and LFM signal synchronization,and it is suitable for the UWA communication network FH system.In the last part,the implementation of signal synchronization and detection system was presented which is in UWA network FH communication system based on FH-CDMA.It adopts software defined radio manner and its hardware platform is constituted by embedded microprocessor and FPGA.It realized the FH synchronization,frame synchronization and data receiving of the system,and the principle diagrams of implementation were given.The performance of the system was investigated in the laboratory’s pool.The results indicate that the system can detect the synchronization fast,accurately and effectively while the signals are weak,and it has high reliability and expansibility.The results prove that the system can meet the demand of FH communication system in UWA network,so the objective of the research has been achieved. |
| Category | Radio |
| Keywords | frequency hopping synchronization, Software Defined Radio, Underwater Acoustic Communication, |
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| Pages | 125 |
| Price | US$60.00 |
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Researching on Signal Synchronization and Detection in Underwater Communication Network Based on FH-CDMA
Billy HU, Ph.D
E-Mail:itpaper@hotmail.com
TEL:1-888-786-998A
