Research And Simulation On Short-wave Channel Modeling

The research and application of short-wave frequency bands are becoming more and more extensive.Short-wave communication occupies an important position in the field of modern communication,especially military communication,and has become an indispensable communication method.Based on the needs of the development of short-wave wireless communication technology,it is necessary to design a suitable short-wave communication system to simulate the actual short-wave communication environment.Therefore,this paper proposes a verification method of improving channel model simulation scheme and simulation implementation model,based on the existing broadband short-wave channel model,and a visual interface to carry out the corresponding channel simulation.This paper analyzes and discusses the physical propagation and statistical characteristics of short-wave channels,and introduces several classic channel models and channel interference and noise phenomena in short-wave communication firstly,which lays a theoretical foundation for the performance evaluation of short-wave communication systems in the following text.Then,after analyzing and comparing the applicable conditions of the existing typical channel models,this paper proposes an improved model simulation implementation algorithm based on the ITS short-wave channel model,and gives its various deduction of the construction method of function module simulation in detail.There are three major innovations here.First,based on the analysis and discussion of the sum-of-sinusoids method in depth,an improved accurate Doppler spread method(?-MEDS)is proposed to construct the ITS model to meet specific Doppler spread algorithms for implementing distributed random modulation functions.The complexity of this method has nothing to do with the number of sine wave adders that generate random sequences,which will greatly improve the simulation efficiency of the system.The second is to solve the problem that the delay power profile function of the ITS model is difficult to calculate in the simulation implementation.An improved scheme for calculating the minimum delay time parameter using the Newton iteration method is proposed,and the parameter calculation derivation of the improved simulation implementation method is given,forming a new easy-to-operate broadband short-wave channel simulation implementation model,and further simulation demonstration based on various channel modeling technical indicators of short-wave communication.Third,based on the Hall noise model,the interference and noise signal model in the channel environment is constructed and simulated.Through the analysis and comparison of various interference and noise waveform simulation results in the communication system,the short-wave communication system is further improved design.Finally,this paper uses the experimental data obtained by Wagner L.S and others to test the typical high latitude 88 km short-wave channel to verify the broadband short-wave channel model obtained by the improved simulation method.The amplitude fading curve and the three-dimensional image of the scattering function of the model were simulated.By comparing the scattering function distributions established by the measured data,the rationality of the improved simulation algorithm based on the ITS wideband short-wave channel model is demonstrated,that is,the model obtained by the improved simulation algorithm can reasonably and accurately reflect the true characteristics of the short-wave channel.This subject provides a new idea of broadband short-wave channel simulation in a new mobile scenario for the research of short-wave channel simulators and the future development of communication test equipment in actual projects.