Basis expansion model for tracking and equalizing rapidly varying multimode fiber channels

2021 ◽  
Vol 67 ◽  
pp. 102695
Author(s):  
Karim A. Said ◽  
Salem F. Hegazy ◽  
Salah S.A. Obayya
Keyword(s):  
Multimode Fiber ◽  
Basis Expansion ◽  
Basis Expansion Model ◽  
Fiber Channels ◽  
Expansion Model

An Improved Channel Estimation Method in OFDM System

2013 ◽  
Vol 347-350 ◽  
pp. 1646-1652
Author(s):  
Shun Xian Li
Keyword(s):  
Channel Estimation ◽  
Orthogonal Frequency Division Multiplexing ◽  
Fourier Coefficients ◽  
Estimation Method ◽  
Ofdm Systems ◽  
Basis Expansion ◽  
Basis Expansion Model ◽  
Inverse Reconstruction ◽  
Expansion Model ◽  
Symbol Duration

In this paper, we will focus on channel estimation (CE) in orthogonal frequency-division multiplexing (OFDM) systems. The time-varying (TV) channelsare 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. Theperforms is goodwhen 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 methodsto find out the best ones in certain conditions.

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