Proc. IEEE Asilomar
Conference on Signal, Systems and Computers,
November 4-7, 2007,
Pacific Grove, California.
Real-Time MIMO Discrete Multitone Transceiver Testbed
Alex G. Olson,
Ian C. Wong and
Brian L. Evans
Department of Electrical
and Computer Engineering,
Engineering Science Building,
The University of Texas at Austin,
Austin, TX 78712 USA
Slides in Office 2007 -
Won Best Student Paper Award for the Architecture and Implementation Track
ADSL Research at UT Austin
Given a wireline transmitter/receiver pair with fixed parameters
(modulation and coding methods, transmission, bandwidth, receiver
noise floor, etc.) that achieves a certain bit rate on a single pair
of wires, one might expect that using two pairs of wires (and two sets
of transceivers) would double the bit rate. However, the presence of
crosstalk induced by the coupling of the energy across the wire pairs
may cause significant reduction in the expected bit rate. In this
paper, we present a multiple-input multiple-output (MIMO) discrete
multitone (DMT) system that achieves double the bit rate of a
traditional single transmitter-receiver system when using 2
transmitters and 2 receivers operating over two wires. The improvement
has been achieved both in desktop simulation and in a real-time
testbed. The testbed also allows rapid exploration of many design
tradeoffs in a DMT system.
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