Research Based On The ITS Wideband High Frequency Channel Model

For traditional short-wave communications,most of the cases are limited to the design of the shortwave communication system or is the study of its channel model,some parameters of ionosphere may not be so understanding.Based on this premise,I on the relatively comprehensive research and analysis,for the application of random parameters in the communications category later laid the foundation,can make up for the deficiency of the in shortwave communication.This paper first introduces the relative knowledge of wireless communication and shortwave channel,and then introduces the concept of channel modeling.In this paper,the formula for free space propagation model analysis and the simulation analysis.Conclusion the propagation characteristics of some free space propagation model.On this basis,this paper puts forward the concept of channel transmission loss factors,and impact factors of three kinds of model of signal transmission loss are calculated and compared,the characteristics of several different channel model,and several channel models is analyzed and concrete application method.On the basis of these,this paper puts forward a way to use a large number of measured data and signal transmission loss impact factor backstepping method of channel transmission loss formula.Based on the existing data and results,this paper proposes a broadband shortwave channel model can be widely used.But ITS model is more complex,the establishment of parameters depends on the actual test data,the need to adopt a similar iterative way,so this paper simplifies the model of a part of the module,ITS and improved to get a certain bandwidth,and can decrease the difficulty of implementing broadband shortwave channel model.Finally,depending on the module ITS model,gives an improved single-mode simulation realization diagram.In the HF channel simulator platform test environments,ITS wideband HF channel model was simulated to achieve a channel simulator performance.By comparing the output waveform data with the theoretical simulation results and we found that the basic agreement,reached a high quality transmission.Experimental results show that,ITS wideband HF channel model proposed in this paper can be a good channel to simulate the effect of shortwave radio signal.Delay power distribution function optimization can more accurately reflect the delay distribution of power within the various propagation paths.In addition,this form of Gaussian distribution function,expressed in the form of a closed,no need for complex numerical and computer iteration to avoid caused the delay in the simulation model ITS inconvenient power distribution function and system overhead.