| Citation: | MI X P，CHEN X H，LIU Q，et al. Tropospheric scattering spectrum sensing based on sliding interception and signal correlation[J]. Journal of Beijing University of Aeronautics and Astronautics，2023，49（2）：464-471 （in Chinese） doi: 10.13700/j.bh.1001-5965.2021.0255
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To improve the performance of tropospheric scattering spectrum sensing, a spectral sensing scheme for tropospheric scattering multipath fading channels is presented. To solve the problem of poor perception of the tropospheric scattering spectrum, the time-domain diffusion characteristics of the tropospheric scattering channel are analyzed based on the distributed reception. The sliding intercept method is proposed to intercept the signal, and the optimal intercept length is calculated. Secondly, in order to reduce the influence of noise on the detection performance, the correlation matrix of signals in each intercept window is obtained by using the signal correlation, and the statistics are constructed. For various numbers of diversity in the Nakagami-m fading channel model, the detection probability and detection threshold are computed. Finally, the performance of the spectrum sensing algorithm under different conditions is verified by simulation analysis. Compared with traditional methods, this method has a better adaptability and better performance in tropospheric scattering channels.
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