Bit Rate Maximization in Discrete Multitone Modulation
Mr. Milos Milosevic
Department of Electrical and Computer Engineering
University of Texas at Austin
Thursday, April 18th, 8:30 AM, ENS 637
mmilosevic@austin.rr.com
Abstract
The traditional discrete multi-tone equalizer is a cascade of a time domain
equalizer (TEQ) as a single finite
impulse response filter, a fast Fourier transform (FFT) multicarrier
demodulator, and a frequency domain equalizer
(FEQ) as a one-tap filter bank. The TEQ shortens the transmission channel
impulse response (CIR) to mitigate
inter-symbol interference (ISI). Maximum Bit Rate (MBR) and Minimum ISI
(Min-ISI) methods achieve higher data
rates at the TEQ output than previously published methods. As an alternative
to the traditional equalizer, the per-tone
equalizer (PTE) moves the TEQ into the FEQ and customizes a multi-tap FEQ
for each tone. In this paper, we propose
a time domain TEQ filter bank (TEQFB) and single TEQ that demonstrate better
data rates at the FEQ output than
MBR, Min-ISI, and least-squares PTE methods with standard CIRs, transmit
filters, and receive filters. We develop a
new model for the signal-to-noise ratio (SNR) at the FFT output that
includes ISI, near-end crosstalk, white Gaussian
noise, and the digital noise floor. The contributions of this paper are:
(1) a new achievable upper bound on bit rate performance,
(2) data rate optimal time domain per-tone TEQ filter bank, and
(3) data rate maximization single TEQ design algorithm.
Biography
Milos Milosevic received B.S.E.E. and M.S.E.E. at the Illinois Institute of
Technology in
Chicago, IL in 1996 and 1998, respectively. He is pursuing his Ph.D. in
electrical engineering at
The University of Texas at Austin, TX. He is a senior engineer in the
Acquisition Department,
Telemetry Section of Schlumberger in Austin, TX, where he designs next
generation high-speed
communication systems for oilfield services. His professional experiences
include a systems
engineering position in Motorola's Networking and Communication Systems
Division where he
worked on the design of a ADSL transceiver based on Motorola 56300 core and
DSP algorithm
design for the Texas Instruments C6000 DSP core at Texas Instruments
Broadband Division.
His current research interests are multicarrier communication systems such
as ADSL or VDSL.
A list of Telecommunications and Signal Processing Seminars is available at
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The Web address for the Telecommunications and Signal Processing Seminars is
http://signal.ece.utexas.edu/seminars