DocumentCode :
2116330
Title :
Determinant maximizing cost function impulse response shortening for discrete multitone transceivers
Author :
Khan, Ejaz ; Heneghan, Conor
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. Coll. Dublin, Ireland
Volume :
3
fYear :
2004
fDate :
5-8 Sept. 2004
Firstpage :
1993
Abstract :
A new criterion is proposed for solving the problem of channel shortening in multicarrier systems. In a discrete multitone receiver, a time-domain equalizer (TEQ) reduces intersymbol interference (ISI) by shortening the effective duration of the channel impulse response. Minimum mean square error (MMSE) method for TEQ does not give satisfactory results. In N. Al-Dahir and J. M. Cioffi (1996) a new criterion for partially equalizing severe ISI channels to reduce the cyclic prefix overhead of the discrete multitone transceiver (DMT), assuming a fixed transmission bandwidth, is introduced. Due to specific constrained (unit morm constraint on the target impulse response (TIR)) in their method, the freedom to choose optimum vector (TIR) is reduced. Better results can be obtained by avoiding the unit norm constraint on the target impulse response (TIR). We change the cost function proposed in N. Al-Dahir and J. M. Cioffi (1996) to the cost function of determining the maximum of a determinant subject to linear matrix inequality (LMI) and quadratic constraint and solve the resulting optimization problem. Usefulness of the proposed method is shown with the help of simulations.
Keywords :
channel estimation; intersymbol interference; least mean squares methods; linear matrix inequalities; optimisation; time-domain analysis; transceivers; transient response; ISI; LMI; MMSE; TEQ; channel impulse response; channel shortening; cost function; discrete multitone receiver; intersymbol interference; linear matrix inequality; minimum mean square error method; multicarrier system; optimization; quadratic constraint; time-domain equalizer; Bandwidth; Cost function; Equalizers; Intersymbol interference; Linear matrix inequalities; Mean square error methods; OFDM modulation; Time domain analysis; Transceivers; Vectors;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Personal, Indoor and Mobile Radio Communications, 2004. PIMRC 2004. 15th IEEE International Symposium on
Print_ISBN :
0-7803-8523-3
Type :
conf
DOI :
10.1109/PIMRC.2004.1368347
Filename :
1368347
Link To Document :
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