Low-complexity channel estimation for wireless OFDM systems
Date
2003
Authors
Athaudage, Chandranath R
Jayalath, Anagiyaddage Dhammik
Journal Title
Journal ISSN
Volume Title
Publisher
Institute of Electrical and Electronics Engineers (IEEE Inc)
Abstract
Wireless communication systems incorporating coherent OFDM requires the estimation and tracking of the time-varying channel response for accurate demodulation of data at the receiver. In pilot-symbol-assisted (PSA) OFDM systems, the minimum mean-square-error (MMSE) estimator is a good channel estimation technique given that channel statistics are known. However, the major drawback of the MMSE estimator is its high computational complexity, which grows with number of pilots. Piecewise-linear interpolation is a low complexity solution to the channel estimation task. In this paper we derive exact expressions for the channel estimation error as a function of pilot spacing, channel statistics and channel noise, when piecewise-linear interpolation is incorporated. We compare the performance of piecewise-linear interpolation against that of a low complexity MMSE technique (piecewise-MMSE interpolation) under both matched and mismatched conditions of channel statistics. Results show that a piecewise-linear interpolator performs better than a mismatched piecewise-MSSE interpolator of same complexity.
Description
Keywords
Keywords: Channel estimation errors; Channel noise; Channel statistics; Estimation techniques; Low complexity; Minimum mean-square-error; OFDM systems; Piece-wise; Piecewise-linear; Pilot symbol assisted; Time varying channel; Wireless communication system; Wireles
Citation
Collections
Source
Proceedings of the 14th IEEE Conference on Personal, Indoor and Mobile Radio Communications
Type
Conference paper