A1 A.P. Clark

A1 S.N. Abdullah

A1 S.Y. Ameen

PB

T1 A comparison of decision-feedback equalizers for a 9600 bit/s modem

JN Journal of the Institution of Electronic and Radio Engineers

VO 58

IS 2

SP 74

OP 83

AB When a digital data signal is received over a linear channel that distorts the signal, the resulting intersymbol-interference can be removed, or at least greatly reduced, by means of a decision-feedback equalizer. A conventional equalizer is adjusted adaptively to minimize the mean-square error in the equalized signal, where the error is caused partly by intersymbol interference and partly by noise. Alternatively, the equalizer may be adjusted adaptively to minimize the noise in the equalized signal, subject to the accurate equalization of the channel. The latter equalizer is usually easier to adjust close to its ideal setting, for both timeinvariant and time-varying channels.The paper compares the tolerances to additive white Gaussian noise of the two equalizers, for the particular application of digital data transmission at 9600 bit/s over telephone circuits. Theoretical analysis is used to compare the equalizers, first for the case where there is a very high signal/noise ratio, and then for the case where the channel introduces pure phase distortion. Computer-simulation tests over models of six different telephone circuits are used to compare the equalizers for more general situations where the signal/noise ratio is not very high and where there is amplitude distortion in the received signal.

K1 zero forcing equaliser

K1 minimum mean square error equaliser

K1 additive white Gaussian noise

K1 received signal

K1 time invariant channels

K1 linear channel

K1 telephone circuits

K1 digital data transmission

K1 amplitude distortion

K1 decision-feedback equalizers

K1 signal/noise ratio

K1 digital data signal

K1 computer simulation tests

K1 phase distortion

K1 9600 bit/s

K1 time varying channels

K1 intersymbol interference

DO https://doi.org/10.1049/jiere.1988.0012

UL https://digital-library.theiet.org/;jsessionid=k78vgkwushr8.x-iet-live-01content/journals/10.1049/jiere.1988.0012

LA English

SN 0267-1689

YR 1988

OL EN