Journal of Beijing University of Posts and Telecommunications

  • EI核心期刊

JOURNAL OF BEIJING UNIVERSITY OF POSTS AND TELECOM ›› 2019, Vol. 42 ›› Issue (5): 29-35.doi: 10.13190/j.jbupt.2019-008

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Time-Varying Channel Modeling Using Least Square Support Vector Machine

ZHAO Xiong-wen, SUN Ning-yao, GENG Sui-yan, ZHANG Yu, DU Fei   

  1. School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China
  • Received:2019-01-19 Online:2019-10-28 Published:2019-11-25

Abstract: Based on 2.55 GHz urban microcellular multiple-input multiple-output (MIMO) channel measurement data, the least squares support vector machine (LS-SVM) method was applied on time-varying channel model. Specifically, a genetic algorithm (GA) based LS-SVM (GA+LS-SVM) model was established for channel parameter prediction. Based on GA+LS-SVM model, the time-varying channel parameters, such as delay spread, horizontal angle spread and vertical angle spread of receiver, were investigated and predicted accurately. Moreover, the GA+LS-SVM model was compared with back propagation neural network and traditional LS-SVM algorithms to verify the effectiveness of the algorithm. In summary, with limited amount of data the GA based LS-SVM model can better adapt to non-linear time-varying channel to realize the accurate prediction of nonlinear time-varying channel parameters.

Key words: time-varying channel, least square support vector machine, genetic algorithm, back propagation neural network

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