Proc. IEEE Int.
Conf. on Acoustics, Speech, and Signal Processing,
vol. 3, pp. 2573-2576, May 13-17, 2002, Orlando, FL
A Dual-path TEQ Structure For DMT-ADSL Systems
Ming Ding (1),
Arthur J. Redfern (2), and
Brian L. Evans (1)
(1) Department of Electrical and Computer Engineering,
Engineering Science Building,
The University of Texas at Austin,
Austin, TX 78712-1084 USA
(2) Texas Instruments DSP R&D Center,
Communication Systems Laboratory,
12500 TI Boulevard, MS 8653, Dallas, TX 75243 USA
Discrete Multitone (DMT) modulation is the industry standard for
Asymmetrical Digital Subscriber Loop (ADSL) modems.
DMT modulation allows for simplified equalization when the effective
duration of the channel memory is shorter than the predefined length
of the cyclic prefix (CP).
A single time-domain equalizer (TEQ) is typically used to truncate the
channel memory such that the data rate loss due to the use of the
CP is reduced.
Because the single TEQ is optimized over all subchannels, it is difficult
to find an ideal solution in which the number of bits supported on
each subchannel is optimized.
This paper proposes a dual-path TEQ, which adds a second TEQ that
is biased to selected subchannels to increase transmission throughput.
The implementation complexity is lower than other band-partition
equalization methods such as per tone equalization.
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