An Improved Channel Estimation Method in OFDM System
In this paper,we will focus on channel estimation (CE) in orthogonal frequency-division multiplexing (OFDM) systems.The time-varying (TV) channels are modeled by a basis expansion model (BEM).Due to the time-variation,the channel matrix in the frequency domain is no longer diagonal,but approximately banded.We use a pilot-aided algorithm for estimation of rapidly varying wireless channels in OFDM systems.The performs is good when the channels vary on the scale of a single OFDM symbol duration,which occurs in mobile communication scenarios such as WiMAX,WAVE,and DVB-T.We recover Fourier coefficients of the channel taps by the pilot information.We then estimate the BEM coefficients of the channel taps from their respective Fourier coefficients using a recently developed inverse reconstruction method.We compare some BEM models in inverse methods to find out the best ones in certain conditions.
OFDM channel estimation Basis Expansion Model (BEM) doubly selective inverse reconstruction method
Shunxian Li
Beijing University of Posts and Telecommunications BUPT Beijing, China
国际会议
太原
英文
230-234
2013-04-06（万方平台首次上网日期，不代表论文的发表时间）