IEEE Asilomar Conference on Signals, Systems, and Computers,
Nov. 3-6, 2002, Pacific Grove, CA USA.
Simultaneous Multichannel Time Domain Equalizer Design Based
On The Maximum Composite Shortening SNR
Milos Milosevic (1)(2),
Lucio F. C. Pessoa (3), and
Brian L. Evans (1)
(1) Embedded Signal Processing Laboratory,
Department of Electrical and Computer Engineering,
The University of Texas at Austin,
Austin, TX 78712-1084 USA
(2) 8021 North FM 620, #1637,
Schlumberger, Austin, TX 78726 USA
(3) 7700 West Parmer Lane MD: TX32-PL30, Motorola, Inc., Austin, TX 78729
TEQ Design Matlab toolbox, DSP source code, papers, and presentations
A time domain equalizer (TEQ) is a finite impulse response filter
that shortens the channel impulse response (CIR) to mitigate
inter-symbol interference (ISI).
Melsa, Younce, and Rohrs minimized ISI in the time domain by maximizing
the shortening signal-to-noise ratio (SSNR) of the energy in a target
window to the energy outside the target window in the shortened CIR.
Infinite SSNR means zero ISI.
Melsa, Younce, and Rohrs also developed a joint channel shortening method to
design a single TEQ to shorten a channel and a near-end echo impulse response.
In this paper, we extend the joint SSNR method to design a single TEQ to
shorten multiple channels by maximizing the composite SSNR.
The composite SSNR is a weighted sum of normalized channel SSNRs.
The normalized SSNR is the ratio of the energy in the target window
samples to the energy of all samples in the shortened CIR and has a
range of [0, 1] so that it is better suited for numerical stability
and fixed-point implementation.
Our proposed method outperforms the joint channel shortening method.
because it achieves higher weighted sum of SSNRs of the used channels.
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