Sparse channel estimation for OFDM transmission based on representative subspace fitting

In channel estimation for OFDM transmission over sparse channels, the time-domain approach requires estimation of much fewer parameters than the frequency-domain approach, but one needs to estimate both the delay and the gain of each path. We consider the time-domain approach and propose an algorith...

Full description

Saved in:
Bibliographic Details
Main Authors: Chun-Jung Wu, Lin, D.W.
Format: Conference Proceeding
Language:English
Subjects:
Added delay
Approximation algorithms
Approximation error
Channel estimation
Delay effects
Delay estimation
Frequency estimation
Interpolation
OFDM
Time domain analysis
Online Access:Request full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In channel estimation for OFDM transmission over sparse channels, the time-domain approach requires estimation of much fewer parameters than the frequency-domain approach, but one needs to estimate both the delay and the gain of each path. We consider the time-domain approach and propose an algorithm that finds a set of delays under a certain criterion on the approximation error. More specifically, we obtain one additional path delay at a time, with each newly added term selected to reduce by the most amount the difference between a subspace spanned by the estimated delays and that perceived at the pilot subcarriers. The proposed method can handle non-sample-spaced path delays and it allows arbitrary, irregularly spaced pilot allocations. Simulation results show some of its operational characteristics and demonstrate its superiority over simple frequency-domain interpolation methods.
ISSN:1550-2252
DOI:10.1109/VETECS.2005.1543340