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Analytical Performance Evaluation of MMSEDFE on TwistedPair Lines Naofal AlDhahir \Lambda

Summary: Analytical Performance Evaluation of MMSE­DFE on Twisted­Pair Lines
Naofal Al­Dhahir \Lambda
, Member IEEE
EDICS Category 2:8:1 (DSP Applications in Communications)
A tight lower--bound on the decision--point SNR of the infinite--length MMSE--DFE on AWGN--plus--
NEXT impaired twisted--pair lines is derived in closed form. For the finite--length MMSE--DFE, the per­
formance is completely determined by the maximum diagonal element in a Cholesky factorization of a
structured correlation matrix. We illustrate how these results can be used for a quick performance evalua­
tion and optimization of system design parameters.
I. Introduction
Recently, there has been increased interest in high--speed transmission over unshielded twisted--pair (UTP)
lines [1, 2]. Such transmission scenarios are impaired by intersymbol interference (ISI), additive--white--
Gaussian noise (AWGN), and crosstalk. Achieving high performance levels requires sophisticated signal
processing at the receiver to mitigate these impairments. The minimum--mean--square--error decision--feedback
equalizer (MMSE--DFE) is an effective receiver structure on UTP lines [1, 2]. Using Monte Carlo simulations
to evaluate the performance of the MMSE--DFE becomes very time consuming for error rates below 10 \Gamma6
(required for reliable data transmission); video transmission requires even lower error rates. Moreover, system
designers often find it necessary to repeat these simulations several times to optimize the various system
parameters. In this letter, we derive a closed--form expression that predicts the performance of the MMSE--


Source: Al-Dhahir, Naofal - Department of Electrical Engineering, University of Texas at Dallas


Collections: Engineering