Research On Channel Estimation And Equalization Algorithm For Mobile Node Underwater Acoustic Communication

With the continuous exploration of Marine resources,underwater acoustic communication technology is developing continuously.China is a big maritime country,and it is very important to develop and protect marine resources.Therefore,it is urgent to study the emerging technologies related to the ocean.In the process of ocean exploration and development,underwater acoustic communication technology is essential.Due to the characteristics of underwater acoustic channel,underwater acoustic communication technology will be affected by noise interference,multipath effect and Doppler effects.In particular,the multipath effect and Doppler effects are the key problems to be solved in the research of mobile node underwater acoustic communication lifting communication system.Therefore,this paper studies the channel estimation and equalization multipath effect in underwater acoustic communication,analyzes the principle and the method of eliminating interference.To study the application of channel equalization in mobile node underwater acoustic communication,the main work of this thesis is as follows:Firstly,the mobile node underwater acoustic communication channel is studied.Theoretical calculation and simulation model of underwater acoustic communication are introduced,then according to the theoretical study,using MATLAB to underwater acoustic channel modeling,solving specific waters of impulse response,using impulse response obtained mathematical model of the mobile node underwater communication transmission,at the same time delay characteristics of underwater acoustic communication,the mobile node to join lays the foundation for follow-up study.Then,the equalization algorithm of underwater acoustic communication is studied.The principle of multipath effect and its solution are analyzed.The multipath effect of underwater acoustic communication is simulated by using typical channel equalization algorithm.According to the characteristics of the actual algorithm,an improved algorithm is researched.The simulation results show that the improved algorithm has better performance than the traditional algorithm,higher stability and can equalize the distortion of the channel.Meanwhile,it can effectively reduce the operation complexity of the equalized algorithm and improve the effect of the mobile node underwater acoustic communication.Finally,the equalization in the application of underwater acoustic communication system,mobile node from the carrier frequency,sampling frequency,the Doppler effect of the mobile underwater acoustic channel are analyzed the influence of the underwater acoustic communication system,and then to mobile underwater acoustic communication system model and simulation design,realization of underwater acoustic communication modulation and demodulation,and applies the equalization algorithm to underwater acoustic communication system,the underwater acoustic communication equalization algorithm was applied in the experiment.