NDLI: Unit Tap Constrained Adaptive Channel Shortening Equalization

Content Provider	IEEE Xplore Digital Library
Author	Martin, R.K.
Copyright Year	2005
Description	Author affiliation: Dept. of Elec. & Comp. Eng., Air Force Inst. of Technol., Wright-Patterson AFB, OH (Martin, R.K.)
Abstract	Orthogonal frequency division multiplexing (OFDM) is a popular transmission format for emerging wireless communication systems. Single-carrier cyclic-prefixed (SCCP) modulation is similar to OFDM, but with all frequency-domain operations performed at the receiver. Systems employing OFDM and SCCP perform well in the presence of multipath provided that the channel delay spread is shorter than the guard interval between transmitted blocks. If this condition is not met, a channel shortening equalizer can be used. Existing adaptive channel shorteners require re-normalization to restrain the channel shortener away from zero. In this paper, we study the use of a unit-tap constraint rather than a unit-norm constraint. We use this constraint to manipulate existing algorithms into a framework analogous to the recursive least squares algorithm, and we develop adaptation rules for blind and semi-blind frequency domain equalizers for SCCP receivers. Simulations show an order of magnitude improvement in convergence speed and reduced asymptotic bit error rate
Starting Page	777
Ending Page	781
File Size	848904
Page Count	5
File Format	PDF
ISBN	1424401313
ISSN	10586393
DOI	10.1109/ACSSC.2005.1599859
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2005-10-30
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Adaptive equalizers OFDM modulation DSL Bit error rate Delay Frequency domain analysis Convolution Wireless LAN Satellite broadcasting Maximum likelihood estimation
Content Type	Text
Resource Type	Article
Subject	Signal Processing Computer Networks and Communications

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