Zero-Forcing Frequency Domain Equalization for DMT Systems with Insufficient Guard Interval

Karp, Tanja ; Wolf, Martin ; Trautmann, Steffen ; Fliege, Norbert J.

Document Type: Conference or workshop publication
Year of publication: 2003
Book title: 2003 IEEE International Conference on Acoustics, Speech, and Signal Processing : April 6 - 10, 2003, Hong Kong; proceedings
The title of a journal, publication series: IEEE International Conference on Acoustics, Speech, and Signal Processing, Hongkong, 06.-10.04.2003
Volume: 4
Page range: 221-224
Place of publication: Piscataway, NJ
Publishing house: IEEE Operations Center
ISBN: 0-7803-7663-3
Publication language: English
Institution: School of Business Informatics and Mathematics > Elektrotechnik (Fliege 1997-2008, Em)
Subject: 004 Computer science, internet
Abstract: A generalized discrete multitone (GDMT) scheme, that not only uses the guard interval, but also redundancy in the frequency domain for equalization, has been introduced recently (Trautmann, S. and Fliege, N.J., IEEE Commun. Letters, vol.6, no.1, p.34-6, 2002; IEEE J. on Selected Areas of Commun., vol.20, no.5, p.987-96, 2002; Karp, T. et al., Proc. IEEE Int. Conf. on Commun., p.1646-50, 2002). Instead of assigning all redundancy in the time domain, it allows taking advantage of unused subcarriers to remove ISI and ICI. We calculate the signal-to-noise ratio for each subcarrier for the zero-forcing equalizer proposed in Karp et al. From there, we derive a new adaptive loading algorithm that optimally chooses the length of the guard interval and the position of unused subcarriers. The cost function applied for the adaptive loading algorithm is the achievable data rate at a fixed error probability.|

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