CN1819500A - Multi-carrier light transmitting method of light access system with multi-path signal - Google Patents
Multi-carrier light transmitting method of light access system with multi-path signal Download PDFInfo
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- CN1819500A CN1819500A CN 200510121533 CN200510121533A CN1819500A CN 1819500 A CN1819500 A CN 1819500A CN 200510121533 CN200510121533 CN 200510121533 CN 200510121533 A CN200510121533 A CN 200510121533A CN 1819500 A CN1819500 A CN 1819500A
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Abstract
Though xDSL technology takes up main share in network access market, but in company with increasing access distance the access rate drops from a few of decade megabit to hundreds kilobit. The invention can keeps maximum access rate of xDSL in a long distance access and includes: a multi-carrier modulation with different frequency is used to transparently pack multi-way xDLS signal to be transmitted, and then optical transceiver outputs the multi-way xDSL signal; the transmission reference signal is used to implement the synchronous demodulation for the multi-way modulation signal; the message interaction channel is used to implement the control and interaction for devices at accessing end and accessed end.
Description
Technical field:
The present invention relates to network access system, particularly the connecting system of analog carrier signal is used.
Background technology:
Broadband access system is used more and more widely, and wherein the xDSL technology has occupied the main share that inserts, and its quantity is in continuous increase; But, along with the increase that inserts distance, xDSL inserts data rate and will reduce greatly, insert data rate and will quickly fall to several million from tens megabits, even has only hundreds of kilobit etc., this can not satisfy user's needs far away, therefore, can provide the higher rate data, and to provide longer-distance multichannel to insert new technology be in demand.
XDSL has more perfect access control protocol and a large amount of users, and therefore when considering long distance, high data rate access multi-user scheme, its scheme preferably can intactly be used the original agreement of XDSL; If redefine the specific interaction protocol of user's access procedure will be the compatibility upgrading that is unfavorable for original system, and its difficulty and cost also can increase.
Use multicarrier multiple signals to be modulated into the signal of unlike signal frequency, it is the multiplex a kind of method of single fiber, but every road carrier wave all needs its corresponding synchronous carrier oscillation signal when restituted signal, synchronous transmission multichannel carrier oscillator signal circuit needs to seek a kind of better sync carrier oscillator signal transmission method with more complicated simultaneously.
In addition, when multicarrier is modulated access to multiple signals, need set identical parameter or agreement at transmitting-receiving two-end, if there is not proprietary management channels, it also is a difficult problem that its transmitting-receiving connects; Especially XDSL has the various protocols bandwidth, can use different bandwidth to carry out multiple signals at interval and insert.
Summary of the invention:
The present invention uses optical fiber to come transmission signals, has increased the speed that inserts user distance and insert data;
The present invention uses the multi-carrier modulation of different frequency to seal the multiple signals of transmission pellucidly, signal demodulation after transmission is reduced into the signal format of original transmission, make user's control mode of original multiple access techniques constant, can effectively carry out compatibility and upgrading existing system;
The present invention uses the transmission reference signal, has realized the synchronous demodulation of multichannel modulation signal;
The present invention uses the interactive data information passage to help realizing inserting the control link and the information interaction of terminal device more;
The present invention has also carried out frequency spectrum planning to multiple radio frequency; Reference signal and interactive data information transmission frequency have taken the low side of transmission band, and the carrier transmission frequency of multi-carrier modulation has taken the high-end of transmission band.
Description of drawings:
Insert the application connection layout as Fig. 1 for the multi-user.Behind the optical transmission device of the optical transmission device of putting into center-side between central apparatus end and the user and far-end, center-side and user's data transmission range increase.When the xDSL signal was inserted application, the speed when its user's access rate ratio does not use optical fiber was compared and will be increased greatly.Subscriber equipment is ONT, and each ONT user can insert the data-signal of multiple business, the application of applicable multiple access device, as: computer, phone and vision facilities etc.
Send the band occupancy distribution diagram of the signal of telecommunication for the central apparatus end as Fig. 2; The carrier (boc) modulated signals of each input signal takies different frequency bands respectively, and from the high-end downward arrangement of frequency band, the single-frequency carrier signal of benchmark is lower than all signal carrier frequency ranges; The frequency band that the control and management data occupancy is minimum.
Send the band occupancy distribution diagram of the signal of telecommunication for remote equipment as Fig. 3; The carrier (boc) modulated signals of each input signal takies different frequency bands respectively, from the high-end downward arrangement of frequency band; The frequency band that the control and management data occupancy is minimum.
As Fig. 4 is center-side equipment block diagram. each input/output signal (RF_1, RF_2 ..., RF_n) mixed filter unit decomposition output (RF11, RF12 ..., RF1n) a plurality of signals, and become the input of optical transmission circuit unit 1; (RF21, RF22 ..., RF2n) many signals from the output of optical receiving circuit unit and input to the mixed filtering unit (4-1 ..., 4-n); Interactive data information will be sent and light-receiving by light.
Come the control circuit operate as normal as Fig. 5 for use circuit control signal between center-side control unit .OAM control and management unit 3-1 and light emission 1 and the receiving circuit 2; The signal that 3-1 output in unit need send to far-end is to unit 3-2, and unit 3-1 receives the signal from the 3-3 unit simultaneously; Unit 3-2 is the frame generation unit that control and management sends data, and it receives from unit 3-1 output signal, and be this conversion of signals the frame that transmits data format accordingly, and unit 3-2 sends to the optical transmission circuit unit to this dateout then; Optical transmission circuit unit 1 is converted to light signal to the transmission data from unit 3-2 with other data and sends to far-end; The signal that optical receiving circuit unit 2 receives from far-end, the data of output control and management information are given unit 3-3; Unit 3-3 is the frame processing unit that control and management receives data, and it offers control and management unit 3-1 after the control and management information translation from far-end.
As Fig. 6 is the light radiating portion of central apparatus end. unit 11 is the analog-modulated unit, the analog signal of a plurality of inputs (RF1, RF2 ..., RFn) carrier signal that will be modulated into different frequency is exported to 13 circuit units; Unit 12 is the carrier signal generation unit, it is by cooperating the single-frequency carrier signal that will produce benchmark, a plurality of carrier modulation frequency of oscillation (f11 of transmission with control circuit, f12 ..., the f1n) frequency of oscillation (f21 of signal and the demodulation of reception multicarrier, f22,, f2n) signal, the single-frequency carrier signal of benchmark offers unit 11, the frequency of oscillation that sends carrier modulation offers unit 11, and the frequency of oscillation of the multicarrier demodulation of reception offers demodulating unit 22 (see figure 7)s of receiving circuit; Unit 13 is the hybrid circuit unit, and it is mixing the compound mixed signal of output after the addition to the unit 14 from the carrier signal of all different frequencies of unit 11 output with from the benchmark single-frequency carrier signal of Unit 12 output; Unit 14 is light emission converting unit, and it is the electrical signal conversion of input light signal output; Control unit 10 sends interactive data information to mixed cell 13.
As Fig. 7 is the light receiving part of central apparatus end. unit 21 is the light-receiving converting unit, and it is converted to the signal of telecommunication to the light signal that receives and exports to unit 22; Unit 22 is the carrier wave demodulation unit, the frequency of oscillation of the input multicarrier demodulation that its use unit 12 provides (f21, f22 ..., f2n) signal, the multicarrier signal of telecommunication of input be demodulated into respectively the output of a plurality of analogue transmission signal (RF1, RF2 ..., RFn); Light-receiving converting unit 21 output information interaction datas are given control unit 10.
As Fig. 8 is the light radiating portion of remote equipment. unit 31 is the analog-modulated unit, the analog signal of a plurality of inputs (RF1, RF2 ..., RFn) carrier signal that will be modulated into different frequency is exported to 33 circuit units; Unit 43 (see figure 9)s for send the carrier oscillation frequency (f11, f12 ..., f1n) and the reception carrier frequency of oscillation (f21, f22 ..., f2n) generation unit, it cooperates the transmission frequency of oscillation that will produce a plurality of carrier modulation to offer unit 31 by control circuit; Unit 33 is the hybrid circuit unit, and its is mixing the compound mixed signal of output after the addition from the carrier signal of all different frequencies of unit 31 output to the unit 34; Unit 34 is light emission converting unit, and it is the electrical signal conversion of input light signal output; Control unit 30 sends interactive data information to mixed cell 33.
As Fig. 9 is the light receiving part of remote equipment. unit 41 is the light-receiving converting unit, and it is converted to the signal of telecommunication to the light signal that receives and exports to unit 42 and unit 43; Unit 43 (see figure 9)s for send the carrier oscillation frequency (f11, f12 ..., f1n) and the reception carrier frequency of oscillation (f21, f22 ..., f2n) generation unit, it cooperates the frequency of oscillation that will produce a plurality of reception carrier modulation to offer unit 42 by control circuit; Unit 42 is the carrier wave demodulation unit, its multicarrier signal of telecommunication of input be demodulated into respectively the output of a plurality of analogue transmission signal (RF1, RF2 ..., RFn); Light-receiving converting unit 41 output information interaction datas are given control unit 30.
As Figure 10 center-side equipment carrier modulation part. unit 111-1 is a filter cell, many signals RF1, RF2, RFn enters a plurality of filter cell 111-1 ~ 111-n respectively, and each filter cell carries out filtering difference output signal to modulator unit (112-1,112-2 to signal,, 112-n); The filtered analog signal of a plurality of inputs will be modulated into the carrier signal of different frequency and export to 13 circuit units; Unit 121 is for sending the carrier wave generation unit, it by control circuit cooperate the frequency of oscillation that will produce a plurality of carrier modulation (f1, f2 ..., fn) offer a plurality of unit (112-1,112-2 ..., 112-n), also produce the simple signal of reference carrier simultaneously; Unit 13 is the hybrid circuit unit, and it mixes addition to carrier signal and the reference carrier signal etc. of all different frequencies of 31 outputs from the unit, exports compound mixed multiplex carrier signal then.
As Figure 11 is central apparatus xDSL signal hop. unit 51 is the analog-modulated unit, the analog signal of a plurality of inputs (xDSL1, xDSL2 ..., xDSLn) carrier signal that will be modulated into different frequency is exported to 53 circuit units; Unit 52 (see figure 9)s for send the carrier oscillation frequency (f11, f12 ..., f1n) and the reception carrier frequency of oscillation (f21, f22 ..., f2n) generation unit, it cooperates the transmission frequency of oscillation that will produce a plurality of carrier modulation to offer unit 51 by control circuit; Unit 53 is the hybrid circuit unit, and its is mixing the compound mixed signal of output after the addition from the carrier signal of all different frequencies of unit 51 output to the unit 54; Unit 54 is light emission converting unit, and it is the electrical signal conversion of input light signal output; Control unit 50 sends interactive data information to mixed cell 53; Light receiving unit 61 receiving optical signals are converted to the signal of telecommunication; The carrier wave demodulation unit receiving signal demodulation for the transmission multiple signals (xDSL1, xDSL2 ..., xDSLn) output.
As Figure 12 is the light radiating portion of remote equipment. unit 71 is the analog-modulated unit, the analog signal of a plurality of inputs (RF1, RF2 ..., RFn) carrier signal that will be modulated into different frequency is exported to 73 circuit units; Unit 72 (see figure 9)s for send the carrier oscillation frequency (f11, f12 ..., f1n) and the reception carrier frequency of oscillation (f21, f22 ..., f2n) generation unit, it cooperates the transmission frequency of oscillation that will produce a plurality of carrier modulation to offer unit 71 by control circuit; Unit 73 is the hybrid circuit unit, and its is mixing the compound mixed signal of output after the addition from the carrier signal of all different frequencies of unit 71 output to the unit 75; Unit 75 is a pre-distortion unit, and the photoemissive signal of needs is carried out pre-distortion; Unit 74 is an electrooptic switching element, and it is the electrical signal conversion of input light signal output; Control unit 70 sends interactive data information to mixed cell 73.
As Figure 13 is the digital predistortion circuit part. unit 81 is the A/D conversion circuit unit, and the analog signal of input will be converted to digital signal; Unit 82 is the digital processing compensating unit, the digital signal of input is carried out digital conversion by pre-distortion characteristics handle back output; Unit 83 is the D/A converting unit, and the digital signal of input is converted to analog signal output; Unit 80 is a control unit, the processing procedure of its control predistortion circuit.
Embodiment:
1) center-side equipment execution mode:
Multichannel input signal more than 1 is modulated to the radio-frequency carrier signal of different frequency respectively; Light sends in the signal and includes reference signal, and this reference signal is used for producing a plurality of carrier oscillation signals at the remote equipment optical receiving end, uses a plurality of carrier oscillation signals that the multicarrier of the signal modulation of transmission is carried out synchronous demodulation; The light transmitting terminal is converted to light signal output containing all different frequency multichannel carrier modulation signals with the superposed signal that contains the mixing of reference signal; Reference signal and interactive data information transmission frequency have taken the low side of transmission band, and the carrier transmission frequency of multi-carrier modulation has taken the high-end of transmission band.
Optical receiving end received RF mixed light signal is converted to the mixing signal of telecommunication; Optical receiving end uses the radio demodulating circuit according to mixing the signal of telecommunication, the multiple signals before the modulation of output far-end; In the light signal between center-side and the far-end, have the interactive data information passage that does not contain multiway transmission signal, center-side equipment can send information to remote equipment.
2) remote equipment execution mode:
The light transmitting terminal of far-end, the signal that comprises the carrier frequency synchronization recovering information that receives according to far-end produces a plurality of different rf frequency signals; Utilize these rf frequency signals, the multichannel input signal more than 1 is modulated to the radio-frequency carrier signal of different frequency respectively; The light transmitting terminal of far-end carries out opto-electronic conversion to the mixed signal that contains all different frequency carrier signal stacks, the optical transmission signal of output rf frequency; The optical receiving end of far-end receives the light signal from center-side, is the mixing signal of telecommunication through opto-electronic conversion; The optical receiving end of far-end extracts the reference signal of mixing in the signal of telecommunication; The optical receiving end of far-end produces the multichannel sync carrier oscillator signal that local demodulation needs according to the reference signal that reception comprises, and respectively the modulated carrier that transmits is carried out demodulation then, the transmission signals before the modulation of output respective radio-frequency; In the light signal between remote equipment and the center-side equipment, have the interactive data information passage that does not contain multiway transmission signal, remote equipment can send information to central apparatus.
Claims (15)
1. the optical transmission method of transmission multiple signals between a kind of center-side and the far-end in the Fiber Access System is specially:
1) center-side is carried out the flashlight transmission to far-end:
A) the light transmitting terminal of center-side is modulated to the multichannel input signal more than 1 respectively the radio-frequency carrier signal of different frequency;
B) include reference signal in the signal of the light transmitting terminal of center-side, this reference signal is used for producing a plurality of carrier oscillation signals at the remote equipment optical receiving end, uses a plurality of carrier oscillation signals that the multicarrier of the signal modulation of transmission is carried out synchronous demodulation;
C) the light transmitting terminal of center-side is converted to light signal output containing all different frequency multichannel carrier modulation signals with the superposed signal that contains the mixing of reference signal;
D) optical receiving end of far-end receives the light signal from center-side, is the mixing signal of telecommunication through opto-electronic conversion;
E) optical receiving end of far-end extracts the reference signal of mixing in the signal of telecommunication;
F) optical receiving end of far-end produces the multichannel sync carrier oscillator signal that local demodulation needs according to the reference signal that reception comprises, and respectively the modulated carrier that transmits is carried out demodulation then, the transmission signals before the modulation of output respective radio-frequency;
2) far-end carries out the flashlight transmission to center-side:
A) the light transmitting terminal of far-end, the signal that comprises the carrier frequency synchronization recovering information that receives according to far-end produces a plurality of different rf frequency signals; Utilize these rf frequency signals, the multichannel input signal more than 1 is modulated to the radio-frequency carrier signal of different frequency respectively;
B) the light transmitting terminal of far-end carries out opto-electronic conversion to the mixed signal that contains all different frequency carrier signal stacks, the optical transmission signal of output rf frequency;
C) the light transmitting terminal of far-end carries out opto-electronic conversion to the mixed signal that contains all different frequency carrier signal stacks, the optical transmission signal of output rf frequency;
D) the optical receiving end received RF mixed light signal of center-side is converted to the mixing signal of telecommunication;
E) optical receiving end of center-side uses the radio demodulating circuit according to mixing the signal of telecommunication, the multiple signals before the modulation of output far-end;
2. in the optical transmission method of right 1, the light transmitting terminal of its center-side is to the reference signal that far-end sends, and can adopt the digital signal of 1 tunnel fixed frequency or the unmodulated reference carrier signal of unifrequency etc. particularly;
3. the optical transmission method of right 1 further comprises: from the far-end to the center-side and center-side in the light signal between the far-end, all there is the interactive data information passage that is independent of outside the multiway transmission signal, mutual transmission information between center-side equipment and remote equipment;
4. in the optical transmission method of the interactive data information passage of right 3 descriptions, the data format of the interactive data information passage that center-side equipment and remote equipment send can be specially: a kind of digital signal in the various communications protocol format such as the Ethernet data of 802.3 series standards, IP data, SLIP data, GFP data, HDLC data, ppp protocol data also can be the carrier signal etc. after above-mentioned numerical data is modulated;
5. during the concrete application of the interactive data information passage of right 3, when data that insert the transmission different bandwidth in multichannel and dissimilar signal, center-side uses different control command signals to send to far-end, far-end is received adopt different configurations to receive;
6. the data-signal content of the interactive data information passage in the right 3 can specifically comprise: set up the control data, center-side and the far-end status data that link between center-side and the far-end, other reaches management data etc. alternately;
7. in the optical transmission method of right 1, its multiway transmission signal content, more specifically can select following any signal to carry out multiplexing, as: xDSL signal, Wimax signal, power line carrier analog signals such as (PLC), and the optical transmission of Ethernet data, SDH data, ATM data or other various data, also may be selected to be the mixed transport of above-mentioned several signals;
8. in the optical transmission method of right 1, input signals transmitted is carried out the concrete grammar of carrier modulation or demodulation can select following any modulation of carrying out, as: intensity (AM) modulating/demodulating, frequency modulation (FM) modulating/demodulating, OFDM modulating/demodulating etc.;
9. in the optical transmission method of right 1, before mixed signal is converted to the light emission, needs that also mixed signal is carried out pre-distortion compensated and handle, to eliminate the non-linear effects of photoelectric conversion process; The predistortion circuit processing method can adopt methods such as digital processing method or simulation process;
10. the digital processing method that the predistortion circuit in the right 9 is concrete is: analog signal is carried out the A/D conversion, digital circuit is carried out pre-distortion, conversion is reduced to analog signal output to the digital signal after the processing through D/A;
11. according to the describing method of right 1, right 2, right 3, wherein each frequency of optical transmission specifically is assigned as:
1) down going channel (from the center-side to the far-end): the low frequency part of interactive data information passage and reference signal passage band occupancy, many input modulating signals carrier occupancy frequency band high-end, each signal frequency band does not intersect mutually;
2) data feedback channel (from the far-end to the center-side): the low frequency part of interactive data information passage band occupancy, many input modulating signals carrier occupancy frequency band high-end, each signal frequency band does not intersect mutually;
12. according to the frequency bandwidth method of right 11, the managing bandwidth signal wherein and the signal amplitude of reference carrier signal will be less than the amplitudes of each signal carrier;
13. a kind of optical transmission device of realizing transmission multiple signals between center-side and the far-end in the Fiber Access System, its system comprises:
1) central apparatus:
A) analog-modulated unit, its function comprises: be used to import multiple signals, multiple signals be modulated to the multichannel carrier signal of different carrier frequencies;
B) reference signal and carrier frequency generation unit, its function comprises: produce a reference signal, this signal can produce synchronous multicarrier oscillator signal at far-end; The carrier oscillation signal of the multi-carrier signal that produces the central apparatus transmission and receive;
C) hybrid circuit unit, its function comprises: this circuit is exported after all input signal mixing additions; Its input signal comprises the multichannel carrier signal of analog-modulated unit output and the signal that comprises the carrier frequency synchronization recovering information of carrier frequency generation unit output etc.;
D) light emission converting unit, its function comprises: send light signal being converted to light signal from the mixing signal of telecommunication of hybrid circuit unit or other transmission signals to remote equipment;
E) light receiving unit: its function comprises a light receiving signal from remote equipment and is converted to the signal of telecommunication;
F) carrier wave demodulation unit: its function comprises the multiway transmission signal before a signal of telecommunication demodulation from light receiving unit is output as the far-end modulation;
G) control unit, its function comprises: produce data message, be used for link binding, communication and management etc. with remote equipment; The work of control centre's device data carrier modulation unit, carrier wave demodulation unit and carrier frequency generation unit etc.;
2) remote equipment:
A) analog-modulated unit: its function comprises and is used to import the multi-channel analog intermediate-freuqncy signal, the multichannel intermediate-freuqncy signal is modulated to the carrier signal output of different carrier frequencies;
B) carrier frequency generation unit, its function comprises: the carrier oscillation signal that produces the multi-carrier signal of remote equipment transmission and reception;
C) hybrid circuit unit: its function comprises this circuit and exports after all input signal mixing additions; Its input signal comprises the multichannel carrier signal of analog-modulated unit output etc.;
D) light emission converting unit: its function comprises cell input signal and comprises the mixing signal of telecommunication from the hybrid circuit unit, and this unit will be converted to light signal to all input electrical signals and send to center-side equipment;
E) light-receiving converting unit: its function comprises a light receiving signal from center-side equipment and is converted to the output of the radio-frequency carrier signal of telecommunication, and therefrom takes out unifrequency carrier reference signal;
F) carrier wave demodulation unit: its function comprises the radio-frequency carrier signal of telecommunication and the unifrequency carrier reference signal of input from light receiving unit, the intermediate frequency transmission signals of demodulation output multichannel;
G) control unit, its function comprises: produce data message, be used for link binding, communication and management etc. with remote equipment; The work of control remote equipment data carrier modulating unit, carrier wave demodulation unit and carrier frequency generation unit etc.
14. in the optical transmission circuit specific implementation according to right 13 its center-side equipment, also comprise predistortion processing circuit, light emission signal carried out pre-distortion;
15. in the optical transmission circuit specific implementation according to right 13 its remote equipments, also comprise predistortion processing circuit, light emission signal carried out pre-distortion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200510121533 CN1819500A (en) | 2005-12-31 | 2005-12-31 | Multi-carrier light transmitting method of light access system with multi-path signal |
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510121533 CN1819500A (en) | 2005-12-31 | 2005-12-31 | Multi-carrier light transmitting method of light access system with multi-path signal |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008049357A1 (en) * | 2006-09-30 | 2008-05-02 | Huawei Technologies Co., Ltd. | A method,system of dada transmission |
| CN102196348A (en) * | 2010-01-22 | 2011-09-21 | 韩国电子通信研究院 | Human body sound transmission apparatus |
| CN102571148A (en) * | 2010-12-29 | 2012-07-11 | 河南省电力公司济源供电公司 | Power grid communication system based on medium-pressure power carrier technology |
| CN103427974A (en) * | 2012-05-23 | 2013-12-04 | 波音公司 | Multiple synchronous IQ demodulators |
| CN105490382A (en) * | 2015-11-25 | 2016-04-13 | 国网辽宁省电力有限公司大连供电公司 | Uplink signal processing method |
-
2005
- 2005-12-31 CN CN 200510121533 patent/CN1819500A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008049357A1 (en) * | 2006-09-30 | 2008-05-02 | Huawei Technologies Co., Ltd. | A method,system of dada transmission |
| CN102196348A (en) * | 2010-01-22 | 2011-09-21 | 韩国电子通信研究院 | Human body sound transmission apparatus |
| CN102196348B (en) * | 2010-01-22 | 2014-05-14 | 韩国电子通信研究院 | Human body sound transmission apparatus |
| CN102571148A (en) * | 2010-12-29 | 2012-07-11 | 河南省电力公司济源供电公司 | Power grid communication system based on medium-pressure power carrier technology |
| CN103427974A (en) * | 2012-05-23 | 2013-12-04 | 波音公司 | Multiple synchronous IQ demodulators |
| CN103427974B (en) * | 2012-05-23 | 2018-02-23 | 波音公司 | Multiple synchronous IQ demodulators |
| CN105490382A (en) * | 2015-11-25 | 2016-04-13 | 国网辽宁省电力有限公司大连供电公司 | Uplink signal processing method |
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