Sampling and prefiltering effects on blind equalizer design
Borah, D.K.
Kennedy, R.A.
Zhi Ding
Fijalkow, I.
Inst. of Adv. Studies, Australian Nat. Univ., Canberra, ACT;
This paper appears in: Signal Processing, IEEE Transactions on
Publication Date: Jan 2001
Volume: 49,
Issue: 1
On page(s): 209-218
ISSN: 1053-587X
References Cited: 22
CODEN: ITPRED
INSPEC Accession Number: 6817457
Digital Object Identifier: 10.1109/78.890364
Current Version Published: 2002-08-07
Abstract
In the development of equalization algorithms for unknown
channels, the effects of the sampling rate and the analog receive
prefilter prior to discretization of the received signal are often
overlooked. In this paper, these effects are investigated. The
relationship between the fractionally spaced output samples of a
noise-limiting prefilter and the symbol spaced output samples of a
matched filter is studied for both the time-invariant and the
time-varying channels. It is shown that the prefilter and the sampling
rate can have significant effects on blind equalization algorithms.
Thus, this paper provides a common framework for comparing different
blind algorithms that are studied in the literature with different
sampling rates. A case study of the well-known subspace method for blind
channel identification is presented. The effects of the noise color due
to the prefilter on equalizers is investigated, and the sensitivity of
the truncation of the overall channel impulse response in terms of the
mean squared error (MSE) performance criterion is investigated through
numerical examples
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