Paper Info
Title
Projection Wavelet Weighted Twin Support Vector Regression For Ofdm System Channel Estimation
Abstract
In this paper, an efficient projection wavelet weighted twin support vector regression (PWWTSVR) based orthogonal frequency division multiplexing system (OFDM) system channel estimation algorithm is proposed. Most Channel estimation algorithms for OFDM systems are based on the linear assumption of channel model. In the proposed algorithm, the OFDM system channel is consumed to be nonlinear and fading in both time and frequency domains. The PWWTSVR utilizes pilot signals to estimate response of nonlinear wireless channel, which is the main work area of SVR. Projection axis in optimal objective function of PWWRSVR is sought to minimize the variance of the projected points due to the utilization of a priori information of training data. Different from traditional support vector regression algorithm, training samples in different positions in the proposed PWWTSVR model are given different penalty weights determined by the wavelet transform. The weights are applied to both the quadratic empirical risk term and the first-degree empirical risk term to reduce the influence of outliers. The final regressor can avoid the overfitting problem to a certain extent and yield great generalization ability for channel estimation. The results of numerical experiments show that the propose algorithm has better performance compared to the conventional pilot-aided channel estimation methods.
Year
DOI
Venue
2021
10.1007/s10462-020-09853-2
ARTIFICIAL INTELLIGENCE REVIEW
Keywords
DocType
Volume
Twin support vector regression, Wavelet transform, Unconstrained minimization, Channel estimation, OFDM
Journal
54
Issue
ISSN
Citations 
1
0269-2821
0
PageRank 
References 
Authors
0.34
0
6
Name
Order
Citations
PageRank
Lidong Wang102.03
Yimei Ma200.34
Xudong Chang300.34
Chuang Gao4205.67
qiang qu58312.15
Xuebo Chen63512.30