Research On The Construction Of Multi Dimensional Radio Environment Map

With the rapid development of wireless communication technology,the spectrum resources are becoming scarce because of traditional spectrum allocation policy.To solve this problem,cognitive radio technology has been proposed.It allows secondary user to utilize the spectrum without effect of primary user.Apperceiving radio environment is the first step of cognitive radio technology.Radio environment map which can help to analysis wireless electromagnetic environment is key for dynamic spectrum access.Therefore this paper studies multi-dimensional radio environment map construction.In this paper,a lot of radio environment map research which include spectrum analysis,signal distribution research have been done based on a large number of measured data.The main content of this paper is followed.Firstly,based on actual data,time domain,frequency domain and spatial domain radio environment maps of Beijing have been constructed.Simulated annealing assisted electrons repulsion sampling scheme which can ensure uniform distribution of sampling points and keep them out of the inaccessible area has been proposed to overcome the weakness of systematic sampling scheme.Secondly,in order to make further research on wireless electromagnetic environment,channel frequency response domain has been added to radio environment map research category.The relationship of channel frequency response and time,location has been studied which has been used in information source localization in complex environment.This paper is of vital significance to radio environment map and fingerprint localization.