A Max-Min Approach to Channel Shortening in OFDM Systems

Tsukasa TAKAHASHI  Teruyuki MIYAJIMA  

Publication
IEICE TRANSACTIONS on Fundamentals of Electronics, Communications and Computer Sciences   Vol.E96-A   No.1   pp.293-295
Publication Date: 2013/01/01
Online ISSN: 1745-1337
DOI: 10.1587/transfun.E96.A.293
Print ISSN: 0916-8508
Type of Manuscript: Special Section LETTER (Special Section on Wideband Systems)
Category: 
Keyword: 
inter-block interference,  carrier nulling algorithm,  blind equalization,  semi-definite relaxation,  

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Summary: 
In OFDM systems, residual inter-block interference can be suppressed by a time-domain equalizer that blindly shortens the effective length of a channel impulse response. To further improve the performance of blind equalizers, we propose a channel shortening method that attempts to maximize the minimum FFT output power over data subcarriers. Simulation results indicate that the max-min strategy has performance improvement over a conventional channel shortening method.