CN1933522B - DSL signal transmitting system and method - Google Patents
DSL signal transmitting system and method Download PDFInfo
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- CN1933522B CN1933522B CN200510130497XA CN200510130497A CN1933522B CN 1933522 B CN1933522 B CN 1933522B CN 200510130497X A CN200510130497X A CN 200510130497XA CN 200510130497 A CN200510130497 A CN 200510130497A CN 1933522 B CN1933522 B CN 1933522B
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Abstract
A transmission system of DSL signal comprises the first and the second multiplex-processing devices. It is featured as interacting multiple DSL signal being multiple-processed between the first and the second multiplex-processing devices and simultaneously sending received signal separately to unit connected to each of the first and the second multiplex-processing device after received signal is demultiplex-processed for speeding up access network maximally.
Description
Technical field
The present invention relates to network communications technology field, relate in particular to a kind of method that adopts high-bandwidth channels multiplex technique transmission DSL signal.
Background technology
XDSL (Digital Subscriber Loop) be a kind of twisted pair telephone (be unshielded twisted pair, Unshielded Twist Pair, UTP) Chuan Shu high speed data transfer technology.Except the DSL of IDSL (isdn digital subscriber line) and SHDSL baseband transmission such as (single pair high bit rate digital subscriber loops), the xDSL of passband transmission utilizes frequency multiplexing technique to make xDSL and POTS (Plain Old Telephone Service) coexist as with on a pair of twisted-pair feeder, wherein xDSL occupies high band, and POTS takies the following baseband portion of 4KHz.What the xDSL of described passband transmission adopted is that DMT (Discrete multi-tone modulation) technology realizes.
The reference model of XDSL system as shown in Figure 1, the POTS signal that transmits on twisted-pair feeder can separate by Splitter (separator) with the xDSL signal, the system that provides multichannel xDSL to insert is called DSLAM (DSL couple in multiplexer).
The xDSL physical layer is divided into three main levels in the ITU-T standard, as Fig. 2, be respectively TPS-TC (host-host protocol associated transport convergence-level) 101, PMS-TC (physical medium associated transport convergence-level) 102 and PMD (Physical Medium sub-layer) 103.The TPS-TC layer is and protocol-dependent sublayer, he mainly finish variety of protocol data and PMS-TC sublayer can recognition data (α/β interface data) conversion.The PMS-TC sublayer finishes mainly that data are disturbed preface, error correction, some encoding functions such as interweave.PMD mainly finishes functions such as constellation mapping, modulation.
The major function of PMD sublayer has only been enumerated some main correlation function modules as shown in Figure 3 in the drawings.Corresponding processing procedure comprises:
(1) at sending direction, go here and there and change 202 and will change into parallel data by the serial data of above-mentioned α interface, and through the laggard planet seat mapping 204 of trellis (grid) encoder 203 codings, adjustment simultaneously gains, the adjusted data that gain are carried out lFFT computing 205, and increase before the circulation (back) and sew after after D/A (digital to analog converter) 207 becomes analog signal, again through driving, be coupled on the transmission line through hybrid network 208 again, i.e. twisted-pair feeder shown in the figure.
(2) at receive direction, received signal from the transmission line (being twisted-pair feeder) through the analog signal behind the hybrid network 208 be exaggerated, A/D and amplify TEQ (time domain equalization) processing section 217, A/D be transformed into digital signal and finish TEQ after by string and change 216 and convert parallel signal to, after FFT and FEQ (frequency domain equalization function) 215 are transformed into frequency-region signal and finish FEQ, again through separating constellation mapping 214, Trellis decoding 213, after and string conversion 212 handle after the β interface to the PMS-TC layer.
Because twisted-pair feeder was to be the audio signal design of transmission bandwidth less than 4kHz originally, therefore, its transmission bandwidth is limited.The application of ADSL (ADSL (Asymmetric Digital Subscriber Line)) expands to about 1M the transmission frequency of twisted-pair feeder.But along with the raising to the demand of access bandwidth, new xDSL technology as VDSL2 (Very-high-speed Digital Subscriber Line), is used the frequency up to 30MHz on twisted-pair feeder, though improved access rate, the scope that effectively inserts is reduced in 1km.
At present, be tending towards ripe, under various environment, approached shannon limit based on the DSL technology of OFDM technology.That is to say,, then must in access bandwidth and access scope, select a compromise, promptly can't guarantee best access bandwidth and access scope simultaneously if from the local side to the user side, still directly use the twisted-pair feeder access technology to carry out the transmission of DSL signal.
For these reasons, industry has proposed to utilize optical fiber to improve the method that inserts distance, thereby can give full play to the ripe access technology of DSL.Yet, because therefore bandwidth of an optical fiber, adopts existing xDSL transmission plan to realize far above the bandwidth of xDSL.
Summary of the invention
The purpose of this invention is to provide a kind of DSL signal transmission system and method, thereby can in IA High Speed Channel, carry out the transmission of multichannel DSL signal simultaneously, and can effectively improve the access scope of DSL.
The objective of the invention is to be achieved through the following technical solutions:
A kind of DSL signal transmission system among the present invention comprises:
The first multiplexing process equipment: the one end links to each other with local side apparatus in the DSL system, and the other end is connected with user side multiplexing process equipment by IA High Speed Channel;
The second multiplexing process equipment: the one end links to each other with ustomer premises access equipment, and the other end then links to each other with the local side multiplexing equipment by IA High Speed Channel;
Mutual between the described first multiplexing process equipment and the second multiplexing process equipment through the multichannel DSL signal after the multiplexing process, also respectively the signal that receives after handling, demultiplexing is sent to and the entity that is connected separately simultaneously;
The described first multiplexing process equipment and the second multiplexing process equipment are respectively local side multiplexing process equipment and user side multiplexing process equipment, and comprise respectively:
Multiplexing module: be used for receiving multichannel DSL signal and carrying out multiplexing process from local side apparatus or ustomer premises access equipment, and send by IA High Speed Channel, described Multiplexing module is the OFDM module, and this OFDM module comprises:
The ordering submodule: being used for the parallel complex data that needs send sorted obtains the data of serial, and gives imaginary part expansion and inverse fast Fourier transform IFFT submodule;
Imaginary part expansion and inverse fast Fourier transform IFFT submodule: be used for the data after the ordering are carried out imaginary part expansion and IFFT processing;
Demultiplexing module: be used to receive the DSL signal that sends by IA High Speed Channel, and it is carried out sending to local side apparatus or ustomer premises access equipment after demultiplexing is handled, described demultiplexing module is for separating the OFDM module, and this is separated the OFDM module and comprises:
Abandon imaginary part and fast Fourier transform FFT submodule: be used for the data that receive are abandoned imaginary part and FFT processing;
Separate the ordering submodule: be used for the serial data through abandoning the output of imaginary part and FFT processing sub is reverted to corresponding parallel complex data.
The described first multiplexing process equipment and the second multiplexing process equipment are:
The first frequency division multiplexing treatment facility and the second frequency division multiplexing treatment facility; Perhaps,
The first time division multiplexing treatment facility and the second time division multiplexing treatment facility; Perhaps,
The first code division multiplexing treatment facility and the second code division multiplexing treatment facility.
Among the present invention, when described IA High Speed Channel adopted same physical transfer circuit to realize, described local side multiplexing process equipment and user side multiplexing process equipment also comprised:
Send to receive mixing module: be used for the DSL signal after Multiplexing module output multiplexing is transmitted by described IA High Speed Channel, simultaneously, also from described IA High Speed Channel reception after multiplexing process the DSL signal and send to demultiplexing module.
Described local side multiplexing process equipment and user side multiplexing process equipment also comprise:
Control module: carry out the transmission of control information between the control module in control module in the local side multiplexing process equipment and the user side multiplexing process equipment, described control information is that Multiplexing module and demultiplexing module are carried out multiplexing or demultiplexing is handled the multiplexing reconciliation multiplexed information that needs.
Described control information is transmitted between control module by the superframe that is provided with the control information byte, comprises at least one data symbol in the described superframe.
Loaded information also comprises in the described control information byte: frame synchronization information and clock information.
Described ordering submodule also comprises:
The transmitting-receiving carrier wave is selected submodule: be used for selecting the data that needs send according to the carrier wave that first control information sends from needs; And/or,
Reset submodule: be used for described data being resequenced according to second control information; And/or,
Zero padding submodule: be used for carrying out zero padding after to the data after resetting and handle according to the 3rd control information;
Corresponding with described ordering submodule, the described ordering submodule of separating also comprises:
The transmitting-receiving carrier wave is inlayed submodule: be used for according to described first control information data that receive being mounted to corresponding carrier wave, the described first control information K1 has described the transmitting-receiving subcarrier TONE interval of each road signal; And/or,
Separate the rearrangement submodule: be used for will carrying out recovery operation through the data of resetting after handling according to described second control information, the described second control information K2 provides reordering rule; And/or,
Submodule zero-suppresses: be used for according to zero removing that described the 3rd control information will cover through the data after the zero padding, described the 3rd control information K3 provides the number of zero plural number.
Described OFDM module also comprises:
The log-compressed submodule is used for that the analog signal after the IFFT processing is carried out log-compressed and handles; And/or,
Sew submodule before and after adding circulation, be used for the signal after handling through IFFT is added the processing of sewing before or after the circulation;
Corresponding with described OFDM module, the described OFDM module of separating also comprises:
Logarithm decompression submodule: be used for to receive multiplexing after the DSL signal carry out the logarithm decompression; And/or,
Go the circulation before and after sew submodule: be used for to receive multiplexing after the DSL signal go the circulation before or after sew processing.
Among the present invention, described Multiplexing module is the time division multiplexing module, and this module comprises:
The transmitting-receiving carrier wave of Lian Jieing is selected ordering submodule and time division multiplexing submodule successively, described transmitting-receiving carrier wave is selected submodule and is used for according to first control information data that needs send being arranged, the data that described time division multiplexing submodule sends according to the needs of the 4th control information after to described arrangement are carried out time division multiplexing and are handled, and the described first control information K1 has described the transmitting-receiving subcarrier TONE interval of each road signal;
Described demultiplexing module is for separating the time division multiplexing module, and is corresponding with the composition of described time division multiplexing module, and this module comprises:
Separate time division multiplexing submodule and the transmitting-receiving carrier wave that connect are successively separated ordering and are inlayed submodule, the described time division multiplexing submodule of separating need be separated the time division multiplexing processing according to described the 4th control information, described transmitting-receiving carrier wave is inlayed submodule and will be received data according to described first control information and revert to the multichannel complex data, and described the 4th control information K4 carries out the rule that time division multiplexing is handled foundation.
Described local side apparatus comprises Digital Subscriber Line Access Multiplexer DSLAM, and described ustomer premises access equipment comprises customer premises equipment, CPE CPE.
Multiplexing module in the described local side multiplexing process equipment and demultiplexing module respectively with DSLAM in the constellation mapping module separate mapping block with constellation and be connected, in the described user side multiplexing process equipment demultiplexing module and Multiplexing module respectively with DSLAM in the IFFT module be connected with fast Fourier transform FFT module.
The present invention also provides a kind of implementation method of the DSL of transmission signal, comprising:
A, the multichannel DSL signal that first equipment is exported carry out multiplexing process and transmission;
B, on second equipment, receive described after multiplexing process the DSL signal and carry out demultiplexing and handle and obtain corresponding each road DSL signal; Described steps A comprises:
Complex data to sent multichannel DSL signal sorts, and imaginary part expansion and IFFT processing back transmission.。
Described multiplexing process is:
Time division multiplexing is handled, frequency division multiplexing is handled or code division multiplexing is handled.
Described complex data to sent multichannel DSL signal sorts and comprises: from multichannel DSL carrier wave, select described complex data, and/or, described complex data is reset processing, and/or, described complex data is carried out zero padding handle;
Described steps A also comprises:
Described data after IFFT handles are carried out log-compressed to be handled.
Described steps A comprises: described complex data is carried out ascending order arrange.
Described steps A also comprises:
At the DSL signal sending end, control information is sent to opposite equip., described control information comprises multiplexed information reconciliation multiplexed information.
Described step B comprises:
Carry out the demultiplexing of described DSL signal after multiplexing handles according to described control information at the DSL signal receiving end.
As seen from the above technical solution provided by the invention, the present invention utilizes the transmission line of high speeds such as optical fiber multiplexing and transmit the xDSL modulation signal of existing maturation, thereby can utilize the bandwidth of high-speed transmission channel fully, improve the utilance of existing network DSLAM, and then improve and utilize the access rate of twisted-pair feeder as the means of access, simultaneously, can also effectively improve the access scope of xDSL.
Therefore, realization of the present invention can be used lower cost, to greatest extent Access Network is raised speed.And the present invention is very little to existing access network structural modification in the specific implementation process.
Description of drawings
Fig. 1 is the reference model schematic diagram of xDSL system;
Fig. 2 is an xDSL function physical layer architecture schematic diagram;
Fig. 3 is an xDSL functional module structure schematic diagram;
Fig. 4 is the structural representation of local side multiplexing process equipment;
Fig. 5 is the structural representation of user side multiplexing process equipment;
Fig. 6 is the position view of the h interface among Fig. 5;
Fig. 7 is the position view of the j interface among Fig. 5;
Fig. 8 is the structural representation one of the Multiplexing module among Fig. 5;
Fig. 9 is the structural representation one of the demultiplexing module among Fig. 5;
Figure 10 is the structural representation two of the Multiplexing module among Fig. 5;
Figure 11 is the composition schematic diagram of multiplex data signal;
Figure 12 is the structural representation two of the demultiplexing module among Fig. 5;
Figure 13 is the embedded control channel schematic diagram;
Figure 14 is the superframe structure schematic diagram.
Embodiment
Core of the present invention is that the transmission line by high bandwidth behind the multichannel DSL signal multiplexing is transmitted, thereby can improve the transmission rate of DSL signal.
System of the present invention mainly comprises:
The first multiplexing process equipment: the one end links to each other with local side apparatus in the DSL system, and the other end is connected with user side multiplexing process equipment by IA High Speed Channel;
The second multiplexing process equipment: the one end links to each other with ustomer premises access equipment, and the other end then links to each other with the local side multiplexing equipment by IA High Speed Channel;
Mutual between the described first multiplexing process equipment and the second multiplexing process equipment through the multichannel DSL signal after the multiplexing process, also respectively the signal that receives after handling, demultiplexing is sent to and the entity that is connected separately simultaneously.
System of the present invention can be adapted to any multichannel DSL signal transmission of carrying out between two equipment, for example, carry out the transmission of multichannel DSL signal etc. between local side apparatus and ustomer premises access equipment.
To be example as the described first multiplexing process equipment and the second multiplexing process equipment respectively with local side multiplexing process equipment and user side multiplexing process equipment below, the specific implementation of system of the present invention will be illustrated accordingly.
Based on the DSL signal multiplexing of DMT technology as shown in Figure 4 and Figure 5 in the schematic diagram of high-speed transmission channel, wherein, Fig. 4 is a local side multiplexing process equipment, Fig. 5 is a user side multiplexing process equipment, the mutual transmission of zooming out that then can realize descending and up DSL signal of the multichannel DSL signal based on the process between described local side multiplexing process equipment and the user side multiplexing process equipment after multiplexing, and can guarantee enough DSL signal transmission bandwidths.
In Fig. 4 and Fig. 5, described local side multiplexing process equipment is connected with each port of DSLAM equipment, be used for and DSLAM equipment between carry out the mutual of DSL signal; Described user side multiplexing process equipment then is connected with CPE by each port, carries out the mutual of DSL information equally.
As shown in Figure 4 and Figure 5, the descending DSL signal of the multichannel that DSLAM 401 among Fig. 4 sends through the h interface after the Multiplexing module 402 of local side is multiplexing, send reception mixing module 403 through local side and receive mixing module 413 from the transmission that IA High Speed Channel is transferred to the user side Fig. 5, the transmission of user side receive mixing module 413 downstream signal to user side demultiplexing module 412 after the j interface is distributed to each port respectively, and the DSL signal of formation standard passes to each CPE (customer premises equipment, CPE) through twisted-pair feeder in each port, has finished the transmission course of whole down channel like this.
In Fig. 4 and Fig. 5, described transmission receives mixing module and only is arranged in the DSL transmission system when adopting same physical transfer circuit as the bidirectional high speed transmission channel between local side multiplexing process equipment and the user side multiplexing process equipment, if adopt the high-speed transmission channel of two different physical transfer circuits, then need not in described system, to be provided with described transmission and receive mixing module as the different directions between local side multiplexing process equipment and the user side multiplexing process equipment.
For the transmission course of the up DSL signal that sends from CPE, then the transmission course with described down channel is identical, repeats no more here.
In Fig. 4 and Fig. 5, the structure function effect of the Multiplexing module in the Multiplexing module in the local side multiplexing process equipment, demultiplexing module and transmission reception mixing module and the user side multiplexing process equipment, demultiplexing module and transmission reception mixing module is identical, just present position difference on physical space just can realize the transmission of zooming out of multichannel DSL signal by symmetrically arranged corresponding module.
In the system of the present invention, for high-speed transmission channel, local side multiplexing process equipment 409 among Fig. 4 and Fig. 5 is a pair of transceivers with user side multiplexing process equipment 419, therefore, have only when the multiplexing of two ends is identical with the demultiplexing scheme multiplexing just possible correct with demultiplexing, for this reason, the present invention uses embedded control channel 406,416 mutual corresponding multiplexing and demultiplexing information.
Local side multiplexing process equipment in the system of the present invention connects by h interface DSLAM equipment, the concrete structure of the data-interface that is connected with the h interface in DSLAM as shown in Figure 6, as can be seen from Figure 6, described local side multiplexing process equipment be with DSLAM in the constellation mapping module of data-interface conciliate mapping block and be connected, by with this module connection can be so that the implementation structure of local side multiplexing process equipment among the present invention and user side multiplexing process equipment be relative simple.
User side multiplexing process equipment in the system of the present invention is connected with port 416 by the j interface, and then be connected with ustomer premises access equipment CPE, the internal structure of the port 416 that is connected with described j interface as shown in Figure 7, the data of certain port of correspondence that sends from the j interface are earlier through IFFT 701 computings modulation, and give AFE (AFE (analog front end)) 703 after sewing before and after louver moudling piece 702 before and after the circulation adds cocycle according to the standard of response; For receive the data come from AFE, after sewing before and after then louver moudling piece 712 goes to circulate before and after going to circulate again the signal through FFT 711 computings becoming frequency domain send to user side multiplexing process equipment from the j interface.
From Fig. 6 and Fig. 7 as can be seen h interface and j interface in the position of the some concrete ports of DSLAM, difference according to multiplexing port number n, the data of h interface and j interface are m group plural numbers, wherein each group plural number has L plural number according to concrete xDSL standard, comprising up-downgoing TONE position.
The plural number group who supposes the h interface is Dh, and the plural number group of j interface is Dj, and then Dj is: (a
11+ jb
11, a
12+ jb
12A
1n+ jb
1n), (a
21+ jb
21, a
22+ jb
22A
2n+ jb
2n) ... (a
M1+ jb
M1, a
M2+ jb
M2A
Mn+ jb
Mn)
If use VDSL2 (profile 12a, touch plate 12a), its sub-band width is 4.3125k, 2048 TONE (subcarrier) are arranged, because the corresponding plural number of each TONE, but owing to be the transmission of having only half can be used for a direction among all 2048 TONE of symmetric bandwidth, so operable carrier frequency n=2048/2=1024 on direction, promptly can transmit xDSL road, n=1024 road signal simultaneously, the unidirectional maximum rate in each road can be down to 68Mbps.Suppose multiplexing number m=20, promptly one road xDSL signal comprises m TONE, and then Dh, Dj comprise mn=20480 plural number, i.e. mn TONE respectively.Therefore, the present invention needs can realize carrying out simultaneously the multiplexing transmission of mn plural number, thereby makes the high-speed transfer that can carry out multichannel xDSL signal simultaneously.
In Fig. 4 and Fig. 5, multiplexing and demultiplexing module is the core composition in the equipment accordingly, to the specific implementation of two nucleus modules be described below, describedly multiplexingly specifically can adopt different multiplexing process modes to carry out multiplexing and de-multiplex operation with demultiplexing module, described multiplexing process mode comprises: frequency division multiplexing, time division multiplexing and code division multiplexing etc., any multiplex mode that also can adopt other to adopt in realizing process of the present invention certainly.To be elaborated to specific implementation of the present invention with two concrete examples below.
At first, when adopting the frequency division multiplexing mode, and adopt be the OFDM mode time, described Multiplexing module is the OFDM module, its concrete structure as shown in Figure 8, described demultiplexing module is separates the OFDM module, its structure as shown in Figure 9.
As shown in Figure 8, the structure of described OFDM module and corresponding processing procedure comprise:
At first the parallel complex data that will need to send by the ordering submodule in the Multiplexing module sorts and obtains the data of serial, and give imaginary part and expand and inverse fast Fourier transform IFFT submodule, for guaranteeing to obtain better multiplexing effect, the processing procedure that the corresponding sequencing submodule provides specifically comprises the processing procedure that following three steps of the first step to the describe;
The first step: the Dh that receives or Dj data-signal are selected submodule by transmitting-receiving TONE carry out selecting of complex data to be sent, afterwards, the complex data of picking out is arranged processing, with the complex data signal to be sent after obtaining to arrange;
Be specially: to the Dh or the Dj of the data that comprised up-downgoing TONE position, select submodule 501 according to the first control information K1 through transmitting-receiving TONE and select the complex data that needs send, and the data that will send are arranged, for example, can arrange according to the ascending order of TONE, wherein the concrete description of the first control information K1 transmitting-receiving TONE interval of each road signal, promptly the complex data that the needs among each TONE send can be picked out according to described first control information, select and finish total mn the TONE in corresponding arrangement back, i.e. mn complex data signal to be sent.
Second step: the data-signal to be sent after will arranging is reset processing by resetting submodule;
In realizing process of the present invention, can the data of the first step be rearranged for satisfying certain purpose, specifically be to reset processing according to the reordering rule that the second control information K2 provides, in rearrangement process, also need to write down the process of rearrangement, and the procedural information of the rearrangement that will write down sends to the demultiplexing submodule by control submodule and control channel, so that can correctly separate rearrangement when demultiplexing; Wherein, described certain purpose comprises: can reset high-speed transmission channel and the reasonable frequency range of predicting of the comprehensive linearity of electronic device by the TONE that bit loading is many.Can make the circuit transmission reliable like this.
The 3rd step: the data-signal that will reset after handling carries out the zero padding processing by the zero padding submodule;
The purpose that zero padding is handled is in order to make the signal after multiplexing become a bandpass signal, to be more conducive to the design and the work of circuit, and the main method of zero padding is that number zero plural number that the 3rd control information K3 provides is filled in the data foremost after resetting in described second step.
The 4th step, the 5th step and the 6th step: successively by imaginary part expansion submodule, IFFT submodule with add and sew submodule before and after the circulation and sew processing before and after carrying out corresponding imaginary part expansion, IFFT computing and adding circulation, the concrete processing procedure that each corresponding submodule is realized is with reference to the VDSL2 (very high bit rate digital subscriber line road 2) of the ITU-T approval method of standard G.993.2, wherein said add to sew before and after the circulation be treated to: add circulation prefix processing, add cyclic suffix and handle or add Cyclic Prefix and suffix is handled;
The 7th step: by the log-compressed submodule analog signal after IFFT (inverse fast Fourier transform) computing is carried out log-compressed and handle, this be because through the PAR (peak-to-average force ratio) of the analog signal after the IFFT computing than higher, the method of employing log-compressed can reduce the peak-to-average force ratio of signal, and the main purpose that promptly adopts log-compressed to handle is exactly to reduce the PAR of signal.
The 8th step: will be sent out through the data after the log-compressed and receive blend sub module 403 and be sent on the IA High Speed Channel and transmit.
When adopting frequency division multiplexing, the structure of described demultiplexing module and processing procedure are as shown in Figure 9, corresponding structure comprises: logarithm decompression submodule, go to sew submodule, FFT submodule, abandon the imaginary part submodule before and after the circulation, the submodule that zero-suppresses, separate the rearrangement submodule, and transmitting-receiving TONE inlays submodule;
Wherein, the described ordering submodule of separating is used for the serial data through abandoning the output of imaginary part and FFT processing sub is reverted to corresponding parallel complex data;
The described ordering submodule of separating specifically also comprises following each functional module:
The transmitting-receiving carrier wave is inlayed submodule and is used for according to described first control information data that receive being mounted to corresponding carrier wave, thereby can obtain the DSL signal of reception on corresponding carrier wave;
Separating the rearrangement submodule is used for will carrying out recovery operation through the data of resetting after handling according to described second control information;
The submodule that zero-suppresses is used for according to zero removing that described the 3rd control information will cover through the data after the zero padding.
Described imaginary part and the fast Fourier transform FFT submodule of abandoning then is used for the data that receive are abandoned imaginary part and FFT handles.
In Fig. 9, corresponding demultiplexing processing procedure is the inverse process of the described multiplexing process process of Fig. 8, and the specific implementation of entire process process is apparent, so do not repeat them here.
Secondly, when adopting time division multiplexing, the structure of described Multiplexing module as shown in figure 10, the structure of described demultiplexing module is as shown in figure 12.
Wherein, the structure of described Multiplexing module and processing procedure comprise:
The first step: the Dh that receives or Dj signal are selected the ordering submodule by transmitting-receiving TONE select and need the data that send and arrange;
Be specially: the Dh or the Dj that will comprise the data of up-downgoing TONE position, selecting the data that need that submodule 501 will pick out send according to the first control information K1 through transmitting-receiving TONE arranges, for example, can arrange according to the ascending order of TONE, wherein the concrete description of the first control information K1 transmitting-receiving TONE interval of each road signal, can from each TONE, pick out the data that needs send according to described first control information, finish to arrange and handle a back publicly-owned mn TONE.
Second step: the data time division multiplexing that the first step is sent according to the 4th control information K4, described the 4th control information K4 carries out the rule that time division multiplexing is handled foundation, promptly can determine according to described the 4th control information K4 which time slot is data specifically be multiplexed on;
Also need the byte of considering that expense takies in the time division multiplexing processing procedure, specifically as shown in figure 11, wherein k is because following control head needs expense regular hour sheet, and
b
ChBe the byte of control head, x is the data symbol number of control head correspondence, and therefore, the byte that expense takies (being bit rate) is
The 3rd step: the data after multiplexing are sent out and receive blend sub module 403 and be sent on the high-speed transmission channel and transmit.
The concrete structure of corresponding demultiplexing submodule and processing procedure are as shown in figure 12 when adopting time division multiplexing, described structure comprises: separate time division multiplexing submodule and transmitting-receiving TONE and separate ordering and inlay submodule, wherein, the described time division multiplexing submodule of separating is separated the time division multiplexing processing according to described the 4th control information K4, described transmitting-receiving TONE separates ordering and inlays the complex data that DSL signal after the process multiplexing process that submodule then will receive according to the described first control information K1 reverts to the serial of parallel multichannel DSL signal correspondence, and corresponding data are mounted in the carrier wave of correspondence, thereby can in the carrier wave that receives, obtain corresponding D SL signal data.
In Figure 12, corresponding demultiplexing processing procedure is the inverse process of multiplexing process process shown in Figure 10, and therefore, the specific implementation of corresponding processing procedure is apparent, so do not repeat them here.
In Fig. 4 and device structure shown in Figure 5, the control module that also comprises setting, use embedded control channel 406,416 (being virtual control channel) to come mutual corresponding multiplexing and demultiplexing information between the control module that described local side multiplexing process equipment and user side multiplexing process equipment are provided with respectively, guaranteeing that two are provided with and can carry out multiplexing and de-multiplex operation exactly, described multiplexing reconciliation multiplexed information comprises needs each information of using in the whole multiplexing reconciliation multiplexing process process.
More specifically say, described embedded control channel can be used for transmitting previously described first, second, third and fourth control information K1, K2, K3, K4, in addition, the transmission of frame synchronization and clock information also is provided, as shown in figure 13, by embedded control channel send control information, frame synchronization and clock synchronization information, described information transmits through Multiplexing module and mixing module (promptly send and receive mixing module) equally, simultaneously, receive described control information, frame synchronization and clock synchronization information through mixing module and demultiplexing module.
Transmit described control information, frame synchronization and clock synchronization information superframe structural representation as shown in figure 14, constitute a superframe by control head and x data symbol, the superframe that adopts a plurality of data symbols to take a control head can be saved the expense of transmission, the control head of this superframe comprises frame head byte and control information byte, and the control information byte in the superframe promptly is used for bear control information, frame synchronization and clock synchronization information.Wherein controlling head all is to use digital signal, and clock information is represented in the hopping edge of its data bit.The frame head byte does not allow the initial of the byte representation superframe that occurs with one group of other special field.
In sum, the present invention utilizes the xDSL modulation signal of the existing maturation of transmission line multiplexing transmission at a high speed, thereby can utilize the bandwidth of high-speed transmission channel fully, and improve the utilance of existing network DSLAM, improved and utilized the access rate of twisted-pair feeder as the means of access.
The above; only for the preferable embodiment of the present invention, but protection scope of the present invention is not limited thereto, and anyly is familiar with those skilled in the art in the technical scope that the present invention discloses; the variation that can expect easily or replacement all should be encompassed within protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of claim.
Claims (17)
1. a DSL signal transmission system is characterized in that, comprising:
The first multiplexing process equipment: the one end links to each other with local side apparatus in the DSL system, and the other end is connected with user side multiplexing process equipment by IA High Speed Channel;
The second multiplexing process equipment: the one end links to each other with ustomer premises access equipment, and the other end then links to each other with the local side multiplexing equipment by IA High Speed Channel;
Mutual between the described first multiplexing process equipment and the second multiplexing process equipment through the multichannel DSL signal after the multiplexing process, also respectively the signal that receives after handling, demultiplexing is sent to and the entity that is connected separately simultaneously;
The described first multiplexing process equipment and the second multiplexing process equipment are respectively local side multiplexing process equipment and user side multiplexing process equipment, and comprise respectively:
Multiplexing module: be used for receiving multichannel DSL signal and carrying out multiplexing process from local side apparatus or ustomer premises access equipment, and send by IA High Speed Channel, described Multiplexing module is the OFDM module, and this OFDM module comprises:
The ordering submodule: being used for the parallel complex data that needs send sorted obtains the data of serial, and gives imaginary part expansion and inverse fast Fourier transform IFFT submodule;
Imaginary part expansion and inverse fast Fourier transform IFFT submodule: be used for the data after the ordering are carried out imaginary part expansion and IFFT processing;
Demultiplexing module: be used to receive the DSL signal that sends by IA High Speed Channel, and it is carried out sending to local side apparatus or ustomer premises access equipment after demultiplexing is handled, described demultiplexing module is for separating the OFDM module, and this is separated the OFDM module and comprises:
Abandon imaginary part and fast Fourier transform FFT submodule: be used for the data that receive are abandoned imaginary part and FFT processing;
Separate the ordering submodule: be used for the serial data through abandoning the output of imaginary part and FFT processing sub is reverted to corresponding parallel complex data.
2. DSL signal transmission system according to claim 1 is characterized in that, the described first multiplexing process equipment and the second multiplexing process equipment are:
The first frequency division multiplexing treatment facility and the second frequency division multiplexing treatment facility; Perhaps,
The first time division multiplexing treatment facility and the second time division multiplexing treatment facility; Perhaps,
The first code division multiplexing treatment facility and the second code division multiplexing treatment facility.
3. DSL signal transmission system according to claim 1 is characterized in that, when described IA High Speed Channel adopted same physical transfer circuit to realize, described local side multiplexing process equipment and user side multiplexing process equipment also comprised:
Send to receive mixing module: be used for the DSL signal after Multiplexing module output multiplexing is transmitted by described IA High Speed Channel, simultaneously, also from described IA High Speed Channel reception after multiplexing process the DSL signal and send to demultiplexing module.
4. DSL signal transmission system according to claim 1 is characterized in that, described local side multiplexing process equipment and user side multiplexing process equipment also comprise:
Control module: carry out the transmission of control information between the control module in control module in the local side multiplexing process equipment and the user side multiplexing process equipment, described control information is that Multiplexing module and demultiplexing module are carried out multiplexing or demultiplexing is handled the multiplexing reconciliation multiplexed information that needs.
5. DSL signal transmission system according to claim 4 is characterized in that described control information is transmitted between control module by the superframe that is provided with the control information byte, comprises at least one data symbol in the described superframe.
6. DSL signal transmission system according to claim 5 is characterized in that, loaded information also comprises in the described control information byte: frame synchronization information and clock information.
7. DSL transmission system according to claim 1 is characterized in that:
Described ordering submodule also comprises:
The transmitting-receiving carrier wave is selected submodule: be used for selecting the data that needs send according to the carrier wave that first control information sends from needs, the described first control information K1 has described the transmitting-receiving subcarrier TONE interval of each road signal; And/or,
Reset submodule: be used for according to second control information described data being resequenced, the described second control information K2 provides reordering rule; And/or,
The zero padding submodule: be used for carrying out zero padding according to the 3rd control information after to the data after resetting and handle, described the 3rd control information K3 provides the number of zero plural number;
Corresponding with described ordering submodule, the described ordering submodule of separating also comprises:
The transmitting-receiving carrier wave is inlayed submodule: be used for according to described first control information data that receive being mounted to corresponding carrier wave; And/or,
Separate the rearrangement submodule: be used for to carry out recovery operation through the data of resetting after handling according to described second control information; And/or,
Submodule zero-suppresses: be used for according to zero removing that described the 3rd control information will cover through the data after the zero padding.
8. DSL transmission system according to claim 1 is characterized in that:
Described OFDM module also comprises:
The log-compressed submodule is used for that the analog signal after the IFFT processing is carried out log-compressed and handles; And/or,
Sew submodule before and after adding circulation, be used for the signal after handling through IFFT is added the processing of sewing before or after the circulation;
Corresponding with described OFDM module, the described OFDM module of separating also comprises:
Logarithm decompression submodule: be used for to receive multiplexing after the DSL signal carry out the logarithm decompression; And/or,
Go the circulation before and after sew submodule: be used for to receive multiplexing after the DSL signal go the circulation before or after sew processing.
9. DSL transmission system according to claim 1 is characterized in that:
Described Multiplexing module is the time division multiplexing module, and this module comprises:
The transmitting-receiving carrier wave of Lian Jieing is selected ordering submodule and time division multiplexing submodule successively, described transmitting-receiving carrier wave is selected submodule and is used for according to first control information data that needs send being arranged, the data that described time division multiplexing submodule sends according to the needs of the 4th control information after to described arrangement are carried out time division multiplexing and are handled, and the described first control information K1 has described the transmitting-receiving subcarrier TONE interval of each road signal;
Described demultiplexing module is for separating the time division multiplexing module, and is corresponding with the composition of described time division multiplexing module, and this module comprises:
Separate time division multiplexing submodule and the transmitting-receiving carrier wave that connect are successively separated ordering and are inlayed submodule, the described time division multiplexing submodule of separating need be separated the time division multiplexing processing according to described the 4th control information, described transmitting-receiving carrier wave is inlayed submodule and will be received data according to described first control information and revert to the multichannel complex data, and described the 4th control information K4 carries out the rule that time division multiplexing is handled foundation.
10. according to each described DSL transmission system of claim 1 to 9, it is characterized in that described local side apparatus comprises Digital Subscriber Line Access Multiplexer DSLAM, described ustomer premises access equipment comprises customer premises equipment, CPE CPE.
11. DSL transmission system according to claim 10, it is characterized in that, Multiplexing module in the described local side multiplexing process equipment and demultiplexing module respectively with DSLAM in the constellation mapping module separate mapping block with constellation and be connected, in the described user side multiplexing process equipment demultiplexing module and Multiplexing module respectively with DSLAM in the IFFT module be connected with fast Fourier transform FFT module.
12. an implementation method of transmitting the DSL signal is characterized in that, comprising:
A, the multichannel DSL signal that first equipment is exported carry out multiplexing process and transmission;
B, on second equipment, receive described after multiplexing process the DSL signal and carry out demultiplexing and handle and obtain corresponding each road DSL signal;
Described steps A comprises:
Complex data to sent multichannel DSL signal sorts, and imaginary part expansion and IFFT processing back transmission.
13. the implementation method of transmission DSL signal according to claim 12 is characterized in that described multiplexing process is:
Time division multiplexing is handled, frequency division multiplexing is handled or code division multiplexing is handled.
14. the implementation method of transmission DSL signal according to claim 12, it is characterized in that, described complex data to sent multichannel DSL signal sorts and comprises: select described complex data from multichannel DSL carrier wave, described complex data is reset processing, described complex data is carried out zero padding handle;
Described steps A also comprises:
Described data after IFFT handles are carried out log-compressed to be handled.
15. the implementation method of transmission DSL signal according to claim 12 is characterized in that described steps A comprises: described complex data is carried out ascending order arrange.
16. the implementation method according to each described transmission DSL signal of claim 12 to 15 is characterized in that described steps A also comprises:
At the DSL signal sending end, control information is sent to opposite equip., described control information comprises multiplexed information reconciliation multiplexed information.
17. the implementation method of transmission DSL signal according to claim 16 is characterized in that described step B comprises:
Carry out the demultiplexing of described DSL signal after multiplexing handles according to described control information at the DSL signal receiving end.
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| CN200510130497XA CN1933522B (en) | 2005-12-13 | 2005-12-13 | DSL signal transmitting system and method |
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| FI121770B (en) | 2007-05-28 | 2011-03-31 | Tellabs Oy | Method and apparatus for transmitting synchronization information |
| CN102638383B (en) * | 2008-01-16 | 2016-01-06 | 瑞博强芯（天津）科技有限公司 | Asymmetric digital subscriber line bandwidth aggregation method, realize system and equipment |
| WO2012106865A1 (en) * | 2011-07-05 | 2012-08-16 | 华为技术有限公司 | Method and device for generating expanded channels |
| US10181973B2 (en) | 2015-06-12 | 2019-01-15 | Futurewei Technologies, Inc. | Trellis shaping on LDPC-coded modulation DMT systems |
| CN110493478B (en) * | 2019-08-02 | 2021-02-09 | 深圳市普威技术有限公司 | Adaptive transmission mode xDSL equipment and system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1346577A (en) * | 1999-04-19 | 2002-04-24 | 日本电气株式会社 | Fiber-optic subscriber transmission system |
| EP1389029A1 (en) * | 2002-07-30 | 2004-02-11 | Alcatel | A DSL access system, a central DSL termination unit, and a remote DSL termination unit realising a DSLAM |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1346577A (en) * | 1999-04-19 | 2002-04-24 | 日本电气株式会社 | Fiber-optic subscriber transmission system |
| EP1389029A1 (en) * | 2002-07-30 | 2004-02-11 | Alcatel | A DSL access system, a central DSL termination unit, and a remote DSL termination unit realising a DSLAM |
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| 全文. |
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