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The Design and Realization of PDS Mode in the UWA Communication Experimental System

Author: WuZuo
Tutor: HuangRuiGuang
School: Huazhong University of Science and Technology
Course: Communication and Information System
Keywords: Underwater acoustic communication Linear FM PDS Delay estimation Adaptive
CLC: TN929.3
Type: Master's thesis
Year: 2005
Downloads: 99
Quote: 2
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Abstract


Characteristics of underwater acoustic (UWA) channel mainly in extremely limited communication bandwidth , multi-path effects , the non-stationary noise of the marine environment and the local noise , time-varying , spatially variable , randomness , and the Doppler effect in five aspects , they has a certain effect on the performance of underwater acoustic communication . Underwater acoustic channel and radio channel has many similarities , a lot of wireless communication technologies are worthy of reference of underwater acoustic communication . PDS ( Pattern- delay shift coding ) system to achieve the underwater acoustic communication in this topic . The PDS system is at the transmitting end use of the delay values ??of the linear FM signal (LFM) of rectangular pulses encode information at the receiving end using the delay estimation techniques to delay decoding , different delay values ??represent different information . PDS take advantage of the wave structure of the signal element to multidimensional channel coding and compression characteristics of good linear chirp signal (LFM) , the ability to have strong anti- multi-path delay spread , to overcome the inter-symbol interference and interference within the code . It can be realized under conditions of low signal-to-noise ratio of the signal detection . Multi-bit encoding can exponentially increase the communication rate . And solved the synchronization problem. In this issue , the first signal mode design , select the appropriate number of Pattern and appropriate Pattern signal to improve the anti- multipath interference ability and communication rate . Then in the framework of the software radio , the design of the entire reception system . Save this sampling process can improve the operation speed of the system during this process , and will not affect the performance of the algorithm ; synchronization position of the peak in order to adapt to external changes in the environment using the adaptive synchronization detection , combined with the intra mode signal secondary positioning , accurate draw each frame location ; decoding via the orthogonal dual channel processing and complex correlation operation to eliminate the phase jitter ; classic delay estimation theoretically use a fast time delay estimation algorithm , counting only a small amount of the correlation values ??can be decoded , thereby improving the speed of operation . Finally , to achieve real-time processing of the accepted system . The study showed that the PDS this new coding system has a considerable potential . Can be seen through the implementation of this encoding , the PDS system has good prospects for development .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Underwater communication ( Sonar communication)
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