Improvement And Implementation Of QPSK Underwater Acoustic Communication Algorithms Based On AM5728

Underwater acoustic communication technology not only plays an important role in promoting the exploration of Marine resources in business,but also has an extremely important strategic significance for the construction of China's Marine military strength.However,the problems of noise interference,multipath effects and Doppler effects in underwater acoustic channel pose many challenges to the robustness of underwater acoustic communication algorithms.Therefore,many scholars have paid more attention to the development of underwater acoustic communication technologies in academic and industrial circles.Among them,adaptive equalization algorithms aim to solve the problem of intersymbol interference,which are closely related to the communication quality of underwater acoustic communication system.Based on the situation described above,we focus on the improvement of adaptive equalization algorithms and the implement of QPSK underwater acoustic communication system.The contributions of this dissertation are summarized as follows:By analyzing the sparsity of underwater acoustic channel,the sparse control proportionate MSER equalization algorithm is introduced to the QPSK underwater acoustic communication for better performance.Experimental results show that the proposed algorithm enables the equalizer to make full use of the sparseness of the underwater acoustic channel,and achieve better performance.In addition,by analyzing the iterative process of the proposed algorithm and eliminating some calculation steps that have little influence on the equalization performance,two lightweight methods for the proposed algorithm to lightening its computation are proposed.Experimental results show that by using the proposed lightweight algorithms,the equalizer can significantly reduce the amount of calculation while ensuring the performance,which facilitates the implement of the proposed algorithm on hardware platforms.Finally,the proposed lightweight algorithm to the QPSK underwater acoustic communication system is applied and implemented on the JN-mini5728 Development Board,where the processor is the heterogeneous multi-core AM5728 processor.The ARM core is designed as the controller to manage the system,and the DSP core is designed as the calculator to execute communication algorithms.The two cores perform their functions respectively and communicate with each other through the designed communication scheme.Finally,the functional test of the entire system through the pool experiment is completed.