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Research and Simulation on Channel Estimation Technology of Underwater Acoustic Communication Based on OFDM

Author: YuXueZuo
Tutor: WeiGang
School: South China University of Technology
Course: Communication and Information System
Keywords: OFDM Channel estimation Underwater acoustic communication Pilot
CLC: TN929.3
Type: Master's thesis
Year: 2011
Downloads: 83
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Abstract


Due to serious time-varying and frequency selective fading underwater acoustic channel is the most complex known channel . Therefore, a lot of high-speed communication systems require adaptive equalization techniques to resist the impact of multi-path , but this will inevitably result in the receiver structure is very complex . OFDM technology to a group of high-speed serial data into parallel data streams relatively low speed , but longer , so cleverly frequency selective fading channel into a flat fading subchannels . The purpose of doing so can dramatically reduce the complexity of the receiver equalizer , in most cases simply use a tap equalizer can be completed to the channel equalizer . According to the basic principle of OFDM and OFDM key technology features built underwater acoustic communication system based on OFDM system simulation platform , and determine parameters . Simulation of different Doppler shift , SNR ( Signal to Interference ratio Ratio , SIR) of the level for the BER . In this paper, the OFDM underwater acoustic communication channel is estimated based on the pilot sequence channel estimation structure , this proved to be suitable for use underwater acoustic communication channel estimation method based on pilot sequence . First study the pilot block frequency as well as comb guide frequency of performance distinction , as well as they are applicable to the channel environment , then study the based on the channel guide frequency of insertion of the estimated algorithm : the smallest square (LS) algorithm and the minimum average squared error (MMSE ) algorithm and a detailed analysis of the the MMSE algorithm improved algorithm : linear minimum mean square error (LMMSE) algorithm based on singular value decomposition of low order approximation channel estimation calculation method Lr - LMMSE . Finally , in a different Doppler frequency shift below through a different channel estimation algorithm for the simulation, for several different algorithms for comparison and analysis .

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