System Architecture and AFE Designs of DMT Transceiver
Date Issued
2001-07-31
Date
2001-07-31
Author(s)
汪重光
DOI
892218E002079
Abstract
In this paper, a DMT (Discrete
Multi-Tone) based VDSL (Very High Speed
Digital Subscriber Lines) digital transceiver
that can transfer 52Mbps data rate is
proposed. The noise environment includes
additive white gaussian noise (AWGN),
Far-End Cross Talk (FEXT), Near-End Cross
Talk (NEXT), and Radio Frequency
Interference (RFI). In the transmitter, the
Inverse Fast Fourier Transform (IFFT) is
designed to modulate the data. There are five
sizes of the tones in DMT based VDSL. In
order to be compatible with these modes, the
architecture that includes four radix-2 stages
and three radix2/4/8 stages is proposed. In
the receiver, the Fast Fourier Transform (FFT)
that has the architecture the same as IFFT is
employed to demodulate the incoming
signals from channel. Besides, the Cyclic
Prefix (CP) and Frequency Domain Equalizer
(FEQ) are designed to combat the Inter
Symbol Interference (ISI) effects. If the
impulse response of the channel is larger than
the maximum length of the cyclic prefix, the
Time Domain Equalizer (TEQ) is used to
shorten the impulse response of this kind of
the channel. Mean while the timing recovery
system is adopted to provide a stable
sampling phase.
Subjects
transceivers
Publisher
臺北市：國立臺灣大學電機工程學系暨研究所
Type
report
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