CN108965184A - A kind of Discrete Multitone Modulation multiplex system and method - Google Patents
A kind of Discrete Multitone Modulation multiplex system and method Download PDFInfo
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- CN108965184A CN108965184A CN201710379526.9A CN201710379526A CN108965184A CN 108965184 A CN108965184 A CN 108965184A CN 201710379526 A CN201710379526 A CN 201710379526A CN 108965184 A CN108965184 A CN 108965184A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2626—Arrangements specific to the transmitter only
- H04L27/2627—Modulators
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2647—Arrangements specific to the receiver only
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
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Abstract
Disclosed herein is a kind of Discrete Multitone Modulation multiplex system and methods, are related to digital subscriber line technical field.Wherein, a kind of Discrete multi-tone DMT modulation multiplex system, the local side receiver FTU-R of local side transmitter FTU-O and feeder terminal unit including feeder terminal unit；The FTU-O includes the low-pass filter LPF of the digital analog converter DAC and 212MHz of inverse fast Fourier transformer IFFT, the 424Ms/s sample rate of quadrature amplitude modulator QAM, FFT_size=4096 of concatenation, wherein, the transformed plural number of the IFFT is serial I, Q two-way totally 8192 real numbers；The FTU-R includes the fast Fourier transformer FFT and QAM of analog-digital converter ADC, FFT_size=4096 of LPF, 424Ms/s sample rate of the 212MHz of concatenation.Technical scheme greatly reduces equipment cost.
Description
Technical field
The present invention relates to digital subscriber line (DSL, Digital Subscriber Line) technical fields, in particular to
A kind of Discrete Multitone Modulation multiplex system and method.
Background technique
The 106MHz frequency spectrum planning of G.fast modulates skill using DMT (Discrete Multi-tone, Discrete multi-tone)
Art, subcarrier spacing 51.75KHz have 2048 subcarriers.Symmetry principle, which is conjugated, according to mirror image is extended to 4096 frequency domains
Then the constellation of complex point of QAM modulation is the real number signal of 4096 time domains, warp according to the IFFT of fft_size=4096 transformation
The DAC for crossing 4096*51.75KHz=212Ms/s sample rate is converted to analog signal, exists using the low-pass filter of 106MHz
The copper wire transmission of DSL.Receiving end first by the analog signal received by the low-pass filter of 106MHz, using
Nyquist sample rate=2*106MHz=212Ms/s ADC is converted to digital signal, the real number signals of 4096 time domains according to
Complex signal of the FFT transform of fft_size=4096 at 4096 frequency domains, last only the 1 to 2048th complex signal of selection,
The qam constellation point on 2048 subcarriers recovered as demodulation.Signal processing such as Fig. 1 institute of 106MHz frequency spectrum planning
Show.
Similarly, the subcarrier spacing of the 212MHz frequency spectrum planning of G.fast is still 51.75KHz, there is 4096 subcarriers.
It is conjugated the constellation of complex point that symmetry principle is extended to the QAM modulation of 8192 frequency domains according to mirror image, then according to fft_size=
8192 IFFT is transformed into the real number signal of 8192 time domains, and the DAC by 8192*51.75KHz=424Ms/s sample rate turns
Be melted into analog signal, using 212MHz low-pass filter DSL copper wire transmission.The simulation that receiving end will first receive
Signal is converted to by the low-pass filter of 212MHz using Nyquist sample rate=2*212MHz=424Ms/s ADC
The real number signal of digital signal, 8192 time domains is believed according to the FFT transform of fft_size=8192 at the plural number of 8192 frequency domains
Number, last only to choose the 1 to 4096th complex signal, the qam constellation point on 4096 subcarriers recovered as demodulation.
The signal processing of 212MHz frequency spectrum planning is as shown in Figure 2.
In the actual development of product, it is often desired to which the transceiver of 212MHz profile can reuse as far as possible
The device and signal processing flow of 106MHz profile transceiver, to reduce cost.212MHz profile is also wished simultaneously
Transceiver can be compatible with the DMT modulated signal of 106MHz.
Currently, the problem is that, according to the transmitter and receiver structure of Fig. 1 and Fig. 2,106MHz is frequently in the related technology
The DMT modulating system of spectrum planning and the planning of 212MHz frequency spectrum respectively needs a set of independent signal processing: the DMT of 106MHz
Modulated signal can only pass through the transmitter and receiver of 106MHz profile；The DMT modulated signal of 212MHz can only pass through
The transmitter and receiver of 212MHz profile.If directly passed using the transmitter and receiver of 106MHz profile
The DMT modulated signal for passing 212MHz, can make the signal of the part 106MHz-212MHz will be unable to transmit；And if directly used
The DMT modulated signal of the transmitter and receiver transmitting 106MHz of 212MHz profile, then can be because of introducing 106MHz-
The out-of-band noise of 212MHz and reduce signal-to-noise ratio, deteriorate performance.
Summary of the invention
Provided herein is a kind of Discrete Multitone Modulation multiplex system and method, it can solve different spectral rule in the related technology
The problem of then needing different DMT modulating systems to send and receive signals.
Disclosed herein is a kind of Discrete multi-tone DMT modulation multiplex system, the local side transmitter including feeder terminal unit
The local side receiver FTU-R of FTU-O and feeder terminal unit；
The FTU-O includes the fast Fourier inverse transformation of quadrature amplitude modulator QAM, FFT_size=4096 of concatenation
The low-pass filter LPF of the digital analog converter DAC and 212MHz of device IFFT, 424Ms/s sample rate, wherein the IFFT transformation
Plural number afterwards is serial I, Q two-way totally 8192 real numbers；
The FTU-R includes analog-digital converter ADC, FFT_size of LPF, 424Ms/s sample rate of the 212MHz of concatenation
=4096 fast Fourier transformer FFT and QAM.
Optionally, in above system, the transformed plural number of IFFT is that serial I, Q two-way includes:
The transformed plural number of IFFT is successively serial I, Q two-way；Or
The transformed plural number of IFFT is successively serial Q, I two-way.
Optionally, in above system, the IFFT of the FFT_size=4096 is become using modulating in OFDM
It changes.
There is disclosed herein a kind of Discrete multi-tone DMT modulation multiplex methods, use system as described above, this method packet
It includes:
4096 subcarriers of 212MHz frequency spectrum planning are 4096 constellation of complex points by the QAM modulation of the FTU-O,
Modulating in OFDM transformation, 4096 to be contacted after modulating transformation are carried out by the IFFT of FFT_size=4096
A road I real number and 4096 road Q real numbers, are converted to digital signal by the DAC of 424Ms/s sample rate, using 212MHz's
LPF is sent to channel；
The FTU-R receives analog signal from channel, by the LPF of 212MHz, using 424Ms/s sample rate
ADC is converted into digital signal, according to the FFT transform of FFT_size=4096 at the complex signal of 4096 frequency domains, is demodulated by QAM
Recover 4096 constellation of complex points on 4096 subcarriers.
There is disclosed herein a kind of Discrete multi-tone DMT modulation multiplex systems, the local side transmitting including feeder terminal unit
The local side receiver FTU-R of machine FTU-O and feeder terminal unit；
The FTU-O includes two-way processing unit, the DMT modulated signal of first via processing unit processes 2-106MHz, packet
Include the quadrature amplitude modulator QAM of concatenation, mirror image grips the inverse fast Fourier transformer of symmetrical device, FFT_size=4096 altogether
The low-pass filter LPF of the digital analog converter DAC and 2-106MHz of IFFT, 212Ms/s sample rate；
The DMT modulated signal of second tunnel processing unit processes 106-212MHz, the quadrature amplitude modulator including concatenation
QAM, mirror image grip the digital-to-analogue of inverse fast Fourier transformer IFFT, the 212Ms/s sample rate of symmetrical device, FFT_size=4096 altogether
The upconverter and bandwidth of converter DAC, 106MHz are the bandpass filter BPF of 106-212MHz；
The FTU-R includes analog-digital converter ADC, FFT_size of LPF, 424Ms/s sample rate of the 212MHz of concatenation
=8192 fast Fourier transformer FFT and QAM.
There is disclosed herein a kind of Discrete multi-tone DMT modulation multiplex methods, use system as described above, this method packet
It includes:
Two groups will be split as in 4096 subcarriers that 212MHz frequency spectrum is planned, every group of 2048 subcarriers, wherein first
2048 subcarriers of group are 2048 constellation of complex points by the QAM modulation in the first via processing unit of the FTU-O, are passed through
Mirror image conjugation symmetry principle is extended to 4096 constellation of complex points, is modulated change using the IFFT of FFT_size=4096
It changes, the real number signal of 4096 time domains is obtained after modulating transformation, digital signal is converted to by the DAC of 212Ms/s sample rate, then
The DMT modulated signal that first via bandwidth is 2-106MHz is obtained by the LPF of 2-106MHz；
Second group of 2048 subcarrier is 2048 multiple by the QAM modulation in the second road processing unit of the FTU-O
Number constellation point is extended to 4096 constellation of complex points by mirror image conjugation symmetry principle, using FFT_size=4096's
IFFT is modulated transformation, and the real number signal of 4096 time domains is obtained after modulating transformation, is turned by the DAC of 212Ms/s sample rate
It is changed to digital signal, carries out frequency conversion using the upconverter of 106MHz, the bandpass filtering for being 106-212MHz using bandwidth
Device BPF obtains the DMT modulated signal that the second tunnel bandwidth is 106-212MHz；
Channel is sent to after two-way DMT modulated signal to be synthesized to the DMT modulated signal of 212MHz bandwidth all the way；
The FTU-R receives analog signal from channel, by the LPF of 212MHz, using 424Ms/s sample rate
ADC is converted into digital signal, last only to select according to the FFT transform of FFT_size=8192 at the complex signal of 8192 frequency domains
The 1 to 4096th complex signal is taken, 4096 constellation of complex points on 4096 subcarriers are recovered by QAM demodulation.
There is disclosed herein a kind of Discrete multi-tone DMT modulation multiplex systems, the local side transmitting including feeder terminal unit
The local side receiver FTU-R of machine FTU-O and feeder terminal unit；
The FTU-O include concatenation quadrature amplitude modulator QAM, mirror image grip symmetrical device, FFT_size=8192 altogether
The low-pass filter LPF of the digital analog converter DAC and 2-106MHz of inverse fast Fourier transformer IFFT, 424Ms/s sample rate；
The FTU-R includes analog-digital converter ADC, FFT_ of LPF, 424Ms/s sample rate of the 2-106MHz of concatenation
The fast Fourier transformer FFT and QAM of size=8192.
There is disclosed herein a kind of Discrete multi-tone DMT modulation multiplex methods, use system as described above, this method packet
It includes:
2048 subcarriers of 106MHz frequency spectrum planning are 2048 constellation of complex points by the QAM modulation of the FTU-O
Duplication portion obtains 4096 constellation of complex points afterwards, is symmetrically extended to 8192 constellation of complex points by mirror image conjugation, using
The IFFT of FFT_size=8192 is modulated transformation, and 8192 real number signals are obtained after modulating transformation, are sampled by 424Ms/s
The DAC of rate is converted to digital signal, is sent to channel using the LPF of 2-106MHz；
The FTU-R receives analog signal from channel, by the LPF of 2-106MHz, using 424Ms/s sample rate
ADC be converted into digital signal, according to the FFT transform of FFT_size=8192 at the complex signal of 8192 frequency domains, choose the 1st
To 4096 complex signals by QAM demodulation recover 4096 constellation of complex points, select the 1 to 2048th complex signal for
106MHz signal.
Technical scheme carries out certain transformation to the transceiver of 212MHz profile, can transmit 106MHz
The DMT modulated signal of bandwidth.Similarly, certain transformation is carried out to the transceiver of 106MHz profile, can transmitted
The DMT modulated signal of 212MHz bandwidth；And as best one can reuse 106MHz profile transceiver IFFT-FFT and
DAC-ADC device, thus greatly reduces equipment cost.
Detailed description of the invention
Fig. 1 is the signal processing schematic diagram of 106MHz frequency spectrum planning in the related technology；
Fig. 2 is the signal processing schematic diagram of 212MHz frequency spectrum planning in the related technology；
Fig. 3 is the signal processing that 212MHz frequency spectrum is planned after being multiplexed the IFFT and FFT of 106MHz in the embodiment of the present invention one
Process schematic；
Fig. 4 is that the signal processing that 212MHz frequency spectrum is planned after being multiplexed the structure of 106MHz in the embodiment of the present invention two shows
It is intended to；
Fig. 5 is that the signal processing that 106MHz frequency spectrum is planned after being multiplexed the structure of 212MHz in the embodiment of the present invention three shows
It is intended to.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment pair
Technical solution of the present invention is described in further detail.It should be noted that in the absence of conflict, embodiments herein and
Feature in embodiment can be arbitrarily combined with each other.
Embodiment one:
The present embodiment provides a kind of Discrete Multitone Modulation multiplex system, at the signal using traditional 212MHz profile
Structure is managed to transmit the DMT modulated signal of 212MHz bandwidth, Main change is as follows:
The DMT modulation symbol of one, 212MHz bandwidth, the transmitter and receiver still planned using 212MHz frequency spectrum.But
It is the IFFT and FFT transform device using the fft_size=4096 of 106MHz, OFDM modulation is changed into DMT modulation, is not used
It is conjugated mirror symmetry.
Two, obtain 4096 road I real numbers and 4096 road Q real numbers after IFFT is converted, then by parallel two number of I, Q
According to being converted into 8192 serial real datas.Such as after 4096 Q circuit-switched datas are placed on 4096 I circuit-switched datas, or
After 4096 I circuit-switched datas are placed on 4096 Q circuit-switched datas, other processing apparatus of transmitter are remained unchanged.
Three, the FFT transform device of FFT_size=4096 of the receiver section in addition to using 106MHz, other devices are kept not
Become.
Specifically, the Discrete Multitone Modulation multiplex system in the present embodiment is as shown in figure 3, include FTU-O and FTU-R two
Part.
FTU-O includes the DAC and 212MHz of FFT, 424Ms/s sample rate of QAM, FFT_size=4096 of concatenation
LPF, wherein the transformed plural number of IFFT is serial I, Q two-way totally 8192 real numbers；
FTU-R include concatenation 212MHz LPF, 424Ms/s sample rate ADC, FFT_size=4096 FFT and
QAM。
Above system realizes that the process of DMT modulation multiplex includes:
4096 subcarriers of 212MHz frequency spectrum planning are 4096 constellation of complex points by the QAM modulation of FTU-O, are passed through
The IFFT of FFT_size=4096 carries out OFDM modulating transformation, 4096 road the I real numbers and 4096 contacted after modulating transformation
A road Q real number, is converted to digital signal by the DAC of 424Ms/s sample rate, is sent to channel using the LPF of 212MHz；
FTU-R receives analog signal from channel, by the LPF of 212MHz, using the ADC of 424Ms/s sample rate
It is converted into digital signal, according to the FFT transform of FFT_size=4096 at the complex signal of 4096 frequency domains, is demodulated by QAM extensive
The 4096 constellation of complex points appeared again on 4096 subcarriers.
Therefore the present embodiment has used the IFFT and fft processor of FFT_size=4096, therefore reduce device at
This；Because the transformed plural number of IFFT is divided into the real number of parallel 4096 points of two-way of I, Q, I, Q are converted into serial
8192 real numbers, can still continue to use the DAC of subsequent 424Ms/s, without making big to entire process flow and structure
Change.
Embodiment two:
The present embodiment is directed to the DMT modulated signal of 212MHz bandwidth, as much as possible using 106MHzprofile transceiver
Structure and device are transmitted, and are changed slightly to signal processing flow, main thought is as follows:
The DMT modulation symbol of one, 212MHz bandwidth is multiplexed the local side transmitter FTU-O of 106MHz profile.But it needs
4096 subcarriers are divided into parallel two-way, the 1 to 2048th subcarrier is divided into all the way, the 2049-4096 subcarrier
It is divided into another way；
Two, the 2049-4096 subcarrier it is corresponding that signal needs to add a 106MHz again after DAC all the way
Upconversion process is modulated to the real number signal of time domain in the carrier frequency of 106MHz, then passes through the BPF of a 106-212MHz
Bandpass filter.Other processing apparatus of transmitter remain unchanged, and two paths of data is merged phase before signal enters DSL channel
Add, synthesizes the DMT modulated signal of 212MHz bandwidth all the way.
Three, terminal receiver FTU-R use the signal processing of 212MHz profile.
Specifically, the Discrete Multitone Modulation multiplex system in the present embodiment is as shown in figure 4, include FTU-O and FTU-R two
Part.
FTU-O includes two-way processing unit, the DMT modulated signal of first via processing unit processes 2-106MHz, including string
The QAM, the mirror image that connect grip the DAC's and 2-106MHz of IFFT, 212Ms/s sample rate of symmetrical device, FFT_size=4096 altogether
LPF；
The DMT modulated signal of second tunnel processing unit processes 106-212MHz, QAM, mirror image including concatenation are gripped symmetrically altogether
The upconverter and bandwidth of DAC, 106MHz of IFFT, 212Ms/s sample rate of device, FFT_size=4096 are 106-212MHz
BPF；
FTU-R include concatenation 212MHz LPF, 424Ms/s sample rate ADC, FFT_size=8192 FFT and
QAM。
Above system realizes that the process of Discrete multi-tone DMT modulation multiplex such as includes:
Two groups will be split as in 4096 subcarriers that 212MHz frequency spectrum is planned, every group of 2048 subcarriers, wherein first
2048 subcarriers (the 1 to 2048th subcarrier) of group are 2048 by the QAM modulation in the first via processing unit of FTU-O
Constellation of complex point is extended to 4096 constellation of complex points by mirror image conjugation symmetry principle, using FFT_size=4096's
IFFT is modulated transformation, and the real number signal of 4096 time domains is obtained after modulating transformation, is turned by the DAC of 212Ms/s sample rate
It is changed to digital signal, obtains the DMT modulated signal that first via bandwidth is 2-106MHz using the LPF of 2-106MHz；
Second group of 2048 subcarrier (the 2049 to 4096th subcarrier) passes through the second road processing unit of the FTU-O
In QAM modulation be 2048 constellation of complex points, be extended to 4096 constellation of complex points by mirror image conjugation symmetry principle, then pass through
The IFFT for crossing FFT_size=4096 is modulated transformation, and the real number signal of 4096 time domains is obtained after modulating transformation, is passed through
The DAC of 212Ms/s sample rate is converted to digital signal, carries out frequency conversion using the upconverter of 106MHz, is using bandwidth
The bandpass filter BPF of 106-212MHz obtains the DMT modulated signal that the second tunnel bandwidth is 106-212MHz；
Channel is sent to after two-way DMT modulated signal to be synthesized to the DMT modulated signal of 212MHz bandwidth all the way；
FTU-R receives analog signal from channel, by the LPF of 212MHz, using the ADC of 424Ms/s sample rate
It is converted into digital signal, it is last only to choose the according to the FFT transform of FFT_size=8192 at the complex signal of 8192 frequency domains
1 to 4096 complex signals recover 4096 constellation of complex points on 4096 subcarriers by QAM demodulation.
From the above, it can be seen that the present embodiment is directed to the DMT modulation symbol of 212MHz bandwidth, do not need to redesign a set of
The transmitter and processor structure of 212MHz profile, in addition to the local side transmitter addition upconverter and BPF band in FTU-O
Outside bandpass filter, most of processing apparatus of 106MHz profile is utilized, so that device cost be greatly saved.FTU-R
Terminal device can still using 212MHz profile receiver without influence receptivity.
Embodiment three:
The present embodiment is directed to the DMT modulated signal of 106MHz bandwidth, is passed using the transceiver of 212MHz profile
It passs, the transceiver of 212MHz profile is allowed to be compatible with the DMT modulated signal of 106MHz, main change thinking is as follows:
The DMT modulation symbol of one, 106MHz bandwidth, the transmitter and receiver of multiplexing 212MHz frequency spectrum planning.By 2048
The corresponding qam constellation point duplication of a subcarrier is a, is extended to 4096 plural numbers.
Two, in addition to low-pass filter LPF bandwidth is adjusted to 2-106MHz from 2-212MHz, other devices are remained unchanged.
Three, receiver finally obtains 4096 plural numbers after FFT transform, only takes the 1 to 2048th plural number, and the 2048th
Later plural number is dropped.
Specifically, the Discrete Multitone Modulation multiplex system in the present embodiment is as shown in figure 5, include FTU-O and FTU-R two
Part.
FTU-O include concatenation quadrature amplitude modulator QAM, mirror image grip altogether symmetrical device, FFT_size=8192 it is quick
The low-pass filter LPF of the digital analog converter DAC and 2-106MHz of inverse Fourier transformer IFFT, 424Ms/s sample rate；
FTU-R includes analog-digital converter ADC, FFT_size=of LPF, 424Ms/s sample rate of the 2-106MHz of concatenation
8192 fast Fourier transformer FFT and QAM.
Above system realizes that the process of Discrete multi-tone DMT modulation multiplex such as includes:
2048 subcarriers of 106MHz frequency spectrum planning are multiple after the QAM modulation of FTU-O is 2048 constellation of complex points
Portion processed obtains 4096 constellation of complex points, i.e., the corresponding constellation point of the 1 to 2048th subcarrier is successively carried to 2049-
4096 subcarriers obtain 4096 constellation of complex points, are symmetrically extended to 8192 constellation of complex points by mirror image conjugation, then pass through
The IFFT for crossing FFT_size=8192 is modulated transformation, and 8192 real number signals are obtained after modulating transformation, are adopted by 424Ms/s
The DAC of sample rate is converted to digital signal, is sent to channel using the LPF of 2-106MHz；
FTU-R receives analog signal from channel, by the LPF of 2-106MHz, using 424Ms/s sample rate
ADC is converted into digital signal, according to the FFT transform of FFT_size=8192 at the complex signal of 8192 frequency domains, chooses the 1st and arrives
4096 complex signals by QAM demodulation recover 4096 constellation of complex points, select the 1 to 2048th complex signal for the 1st to
The Frequency point signal for the 2-106MHz that 2048 subcarriers are corresponding in turn to.
The benefit of the present embodiment is the DMT modulation symbol of 106MHz bandwidth, can use the transceiver of 212MHzprofile
It is transmitted, it is only necessary to the cut off band width of LPF low-pass filter be changed to 106MHz, it is succinct convenient to design.
Those of ordinary skill in the art will appreciate that all or part of the steps in the above method can be instructed by program
Related hardware is completed, and described program can store in computer readable storage medium, such as read-only memory, disk or CD
Deng.Optionally, one or more integrated circuits can be used also to realize in all or part of the steps of above-described embodiment.Accordingly
Ground, each module/unit in above-described embodiment can take the form of hardware realization, can also use the shape of software function module
Formula is realized.The application is not limited to the combination of the hardware and software of any particular form.
The above, preferred embodiments only of the invention, is not intended to limit the scope of the present invention.It is all this
Within the spirit and principle of invention, any modification, equivalent substitution, improvement and etc. done should be included in protection model of the invention
Within enclosing.
Claims (8)
1. a kind of Discrete multi-tone DMT modulation multiplex system, local side transmitter FTU-O and feeder line including feeder terminal unit are whole
The local side receiver FTU-R of end device；
The FTU-O includes the inverse fast Fourier transformer of quadrature amplitude modulator QAM, FFT_size=4096 of concatenation
The low-pass filter LPF of the digital analog converter DAC and 212MHz of IFFT, 424Ms/s sample rate, wherein after the IFFT transformation
Plural number be serial I, Q two-way totally 8192 real numbers；
The FTU-R includes analog-digital converter ADC, FFT_size=of LPF, 424Ms/s sample rate of the 212MHz of concatenation
4096 fast Fourier transformer FFT and QAM.
2. the system as claimed in claim 1, which is characterized in that the transformed plural number of IFFT is serial I, Q two-way packet
It includes:
The transformed plural number of IFFT is successively serial I, Q two-way；Or
The transformed plural number of IFFT is successively serial Q, I two-way.
3. system as claimed in claim 1 or 2, which is characterized in that the IFFT of the FFT_size=4096 uses orthogonal frequency
Divide multiplexing OFDM modulating transformation.
4. a kind of Discrete multi-tone DMT modulation multiplex method, using system as described in claims 1 to 3, this method comprises:
4096 subcarriers of 212MHz frequency spectrum planning are 4096 constellation of complex points by the QAM modulation of the FTU-O, are passed through
The IFFT of FFT_size=4096 carries out modulating in OFDM transformation, 4096 I to be contacted after modulating transformation
Road real number and 4096 road Q real numbers, are converted to digital signal by the DAC of 424Ms/s sample rate, using the LPF of 212MHz
It is sent to channel；
The FTU-R receives analog signal from channel, by the LPF of 212MHz, using the ADC of 424Ms/s sample rate
It is converted into digital signal, according to the FFT transform of FFT_size=4096 at the complex signal of 4096 frequency domains, is demodulated by QAM extensive
The 4096 constellation of complex points appeared again on 4096 subcarriers.
5. a kind of Discrete multi-tone DMT modulation multiplex system, local side transmitter FTU-O and feeder line including feeder terminal unit are whole
The local side receiver FTU-R of end device；
The FTU-O includes two-way processing unit, the DMT modulated signal of first via processing unit processes 2-106MHz, including string
Quadrature amplitude modulator QAM, the mirror image connect grip altogether symmetrical device, FFT_size=4096 inverse fast Fourier transformer IFFT,
The low-pass filter LPF of the digital analog converter DAC and 2-106MHz of 212Ms/s sample rate；
The DMT modulated signal of second tunnel processing unit processes 106-212MHz, quadrature amplitude modulator QAM, mirror including concatenation
Digital analog converter as gripping inverse fast Fourier transformer IFFT, the 212Ms/s sample rate of symmetrical device, FFT_size=4096 altogether
The upconverter and bandwidth of DAC, 106MHz are the bandpass filter BPF of 106-212MHz；
The FTU-R includes analog-digital converter ADC, FFT_size=of LPF, 424Ms/s sample rate of the 212MHz of concatenation
8192 fast Fourier transformer FFT and QAM.
6. a kind of Discrete multi-tone DMT modulation multiplex method, using system as claimed in claim 5, this method comprises:
Two groups will be split as in 4096 subcarriers that 212MHz frequency spectrum is planned, every group of 2048 subcarriers, wherein first group
2048 subcarriers are 2048 constellation of complex points by the QAM modulation in the first via processing unit of the FTU-O, by mirror
Image conjugate symmetry principle is extended to 4096 constellation of complex points, is modulated transformation using the IFFT of FFT_size=4096,
The real number signal that 4096 time domains are obtained after modulating transformation is converted to digital signal by the DAC of 212Ms/s sample rate, then passes through
The LPF for crossing 2-106MHz obtains the DMT modulated signal that first via bandwidth is 2-106MHz；
Second group of 2048 subcarrier is 2048 plural stars by the QAM modulation in the second road processing unit of the FTU-O
Seat point, by mirror image conjugation symmetry principle be extended to 4096 constellation of complex points, using FFT_size=4096 IFFT into
Row modulating transformation obtains the real number signal of 4096 time domains after modulating transformation, is converted to number by the DAC of 212Ms/s sample rate
Word signal carries out frequency conversion using the upconverter of 106MHz, obtains using the bandpass filter BPF that bandwidth is 106-212MHz
The DMT modulated signal for being 106-212MHz to the second tunnel bandwidth；
Channel is sent to after two-way DMT modulated signal to be synthesized to the DMT modulated signal of 212MHz bandwidth all the way；
The FTU-R receives analog signal from channel, by the LPF of 212MHz, using the ADC of 424Ms/s sample rate
It is converted into digital signal, it is last only to choose the according to the FFT transform of FFT_size=8192 at the complex signal of 8192 frequency domains
1 to 4096 complex signals recover 4096 constellation of complex points on 4096 subcarriers by QAM demodulation.
7. a kind of Discrete multi-tone DMT modulation multiplex system, local side transmitter FTU-O and feeder line including feeder terminal unit are whole
The local side receiver FTU-R of end device；
The FTU-O include concatenation quadrature amplitude modulator QAM, mirror image grip altogether symmetrical device, FFT_size=8192 it is quick
The low-pass filter LPF of the digital analog converter DAC and 2-106MHz of inverse Fourier transformer IFFT, 424Ms/s sample rate；
The FTU-R includes analog-digital converter ADC, FFT_size=of LPF, 424Ms/s sample rate of the 2-106MHz of concatenation
8192 fast Fourier transformer FFT and QAM.
8. a kind of Discrete multi-tone DMT modulation multiplex method, using system as claimed in claim 7, this method comprises:
2048 subcarriers of 106MHz frequency spectrum planning are multiple after the QAM modulation of the FTU-O is 2048 constellation of complex points
Portion processed obtains 4096 constellation of complex points, symmetrically 8192 constellation of complex points is extended to by mirror image conjugation, using FFT_
The IFFT of size=8192 is modulated transformation, and 8192 real number signals are obtained after modulating transformation, pass through 424Ms/s sample rate
DAC is converted to digital signal, is sent to channel using the LPF of 2-106MHz；
The FTU-R receives analog signal from channel, by the LPF of 2-106MHz, using 424Ms/s sample rate
ADC is converted into digital signal, according to the FFT transform of FFT_size=8192 at the complex signal of 8192 frequency domains, chooses the 1st and arrives
4096 complex signals recover 4096 constellation of complex points by QAM demodulation, and selecting the 1 to 2048th complex signal is 106MHz
Signal.
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