Experimental Study On Long-wave Wireless Communication Channel Simulation And Stochastic Resonance Signal Processing

With the development of maritime communications,people are increasingly pursuing the quality of long-wave communications.Long-wave communication is often faced with strong interference from the atmosphere and the problem of small power after signal passing through the seawater.However,the study of stochastic resonance signal enhancement technology is a problem of transforming noise's energy into signal's energy.The research content of this paper is to make the stochastic resonance signal enhancement technology be applied to the long wave communication scenario and complet the design and implementation of the Long-wave Communication System.The principle of stochastic resonance has been applied to the field of signal detection,but the application of systems and devices of wireless communications have not been reported.This article takes this as a starting point,considering of the characteristics that stochastic resonance is more applicable to the low frequency,and explores the possibility of the combination of stochastic resonance theory and long wave communication system.Starting from the traditional stochastic resonance theory and the realization of its analog circuits,this article explains its limitations,and then proposes a super-threshold stochastic resonance theory for long-wave communication application scenarios,and determines the Normalized Clipper derived from this theory as a good way for preprocessing of long-wave communication signals.This article has carried on the environment analysis and channel simulation of long-wave communication signal propagation.The model of atmospheric electrical noise superimposed during the propagation of long-wave signals is introduced,its distribution characteristics are determined,and this model is simulated to generate such noise in hardware circuits.Secondly,the propagation characteristics of long-wave signals through seawater are introduced.According to this model,analog circuits are used to simulate ocean fading channels.Finally,this paper introduces the design and implementation of the receiver part of long wave communication test system.It mainly introduces the overall hardware configuration of the receiver using multi-core DSP design and the program flow of each module.Three types of long-wave signal receivers based on the stochastic resonance signal enhancement method and two other commonly used engineering signal processing methods are respectively implemented using three cores of the DSP.Finally,one complete long-wave communication test system was built,and the BER performance test results of the three receivers were tested in parallel in this system.