CN102263726A - Data transmitting method, device and system - Google Patents
Data transmitting method, device and system Download PDFInfo
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- CN102263726A CN102263726A CN2011101747865A CN201110174786A CN102263726A CN 102263726 A CN102263726 A CN 102263726A CN 2011101747865 A CN2011101747865 A CN 2011101747865A CN 201110174786 A CN201110174786 A CN 201110174786A CN 102263726 A CN102263726 A CN 102263726A
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Abstract
The invention discloses a data transmitting method, device and system. The data transmitting method comprises the steps: an optical line terminal (OLT) is used for distributing uplink transmission control parameters for all optical network units (ONU) and sending the distributed uplink transmission control parameters to the ONUs; and each ONU is used for processing the input uplink data according to the uplink transmission control parameters so that an orthogonal frequency division multiplexing (OFDM) modulation signal is obtained, and sending the OFDM modulation signal to the OLT by utilizing optical carriers of the same wavelength according to the uplink transmission control parameters. According to the technical scheme disclosed by the invention, the scheme for transmitting colorless uplink data of an OFDM-PON (passive optical network) system is realized.
Description
Technical field
The present invention relates to the passive optical network of OFDM, relate in particular to a kind of transmission method, Apparatus and system of data.
Background technology
In recent years, because The application of new technique such as a large amount of layings of optical fiber and wavelength division multiplexing make the trunk optical fiber network that breakthrough development be arranged within several years.Simultaneously because the progress of ethernet technology, by its leading local area network (LAN) bandwidth also from 10M, 100M to 1G even 10G.At present, the place that needs most breakthrough just is to connect a section between network backbone and local area network (LAN) and the domestic consumer, and Here it is " last kilometer " of often saying.In various technology, EPON (PON, Passive Optical Network) technology has obtained to pay close attention to widely.Fig. 1 is the architectural schematic of EPON in the prior art, as shown in Figure 1, the chief component of typical PON comprises optical line terminal (OLT, Optical Line Terminator), optical network unit (ONU, Optical Network Unit) and optical distribution (ODN, Optical Distribution Network).
The PON technology mainly contains asynchronous transfer mode (ATM at present, Asynchronous Transfer Mode) EPON (ATM PON or APON), Ethernet passive optical network (EPON, Ethernet PON), Gigabit-capable Passive Optical Network (GPON, Gigabit-Capable PON) and Wave division multiplexing passive optical network (WDM-PON, Wavelength Division Multiplexing PON) etc. several, their main difference has been to adopt different transmission technologys.Wherein, EPON is fit to the broadband access of IP operation very much, and the commercialization degree is the highest.2004, IEEE approval EPON standard was 802.3ah, can support the transmission of up-downgoing flank speed 1.25Gb/s, and is maximum along separate routes than being 64.The advantage of EPON mainly contains: (1) maturation of Ethernet, and equipment cost is low; (2) equipment price is low, and versatility is good; (3) removed the agreement and the format conversion of IP transfer of data, the efficient height, management is simple, can support IP-based integrated service and multiple Service Quality Management flexibly; And shortcoming is when being to transmit the real-time service that high-quality guarantees, the implementation procedure more complicated, and service quality problem and flow control are to be strengthened.GPON is then having certain advantage aspect two-forty and the multi-service support, and its advantage mainly contains: (1) carrying Fast Ethernet and T1/E1 circuit do not need overhead, can not increase complexity; (2) the integrated service tenability is strong, virtual support local area network (LAN) (VLAN, Virtual Local Area Network) exchange and other new Ethernet services.Shortcoming is that at present its cost is compared higherly with EPON, does not have clear superiority when only carrying Ethernet service and speech business.WDM-PON is based on wavelength-division multiplex technique, promptly adopts the light of multi beam different wave length on same optical fiber simultaneously, distributes to different business or terminal with the light of different wave length.On know-why, EPON and GPON are the power Splittables, WDM-PON then belongs to wavelength division multiplexing, use optical branching device identification optical fiber cable termination equipment (OLT, Optical Line Terminal) the various wavelength that send, give each road optical node (ONU, Optical Network Unit) with signal allocation.The advantage of WDM-PON is to realize higher working bandwidth to have certain advantage aspect network management and the system upgrade, but that shortcoming is a cost is very high, also has a very long segment distance apart from industrialization and large-scale application.
Since two thousand seven, academia enters on a kind of novel PON technology based on OFDM (OFDMA, Orthogonal Frequency Division Multiple Access).OFDMA is based on the access technology of OFDM (OFDM, Orthogonal Frequency Division Multiple) technology.In the OFDM technology, channel is divided into some orthogonal sub-channels, converts high-speed data signal to parallel low speed sub data flow, is modulated on each orthogonal sub-channels and transmits.Orthogonal signalling can reduce the phase mutual interference (ICI, Inter-Cell Interference) between the orthogonal sub-channels like this by adopting Digital Signal Processing to carry out separate processes at receiving terminal.OFDMA is after utilizing OFDM that channel carry out subcarrierization, loads the multiple access technique of transmission data on the parton carrier wave.But the OFDMA technology exists as a lot of problems such as colourless property, can increase transmitter light source management costs like this, has promptly increased the cost of up link.
As shown in Figure 2, the production process of OFDMA baseband signal is: at first the input bit sequence is gone here and there and change, be converted to the parallel signal of one group of m * M bit, then signal is carried out the orthogonal amplitude keying (QAM of every symbol m bit, Quadrature Amplitude Modulation) mapping obtains the QAM modulation symbol; The parallel signal of every group of M QAM modulation symbol obtaining is carried out the subcarrier mapping; (parallel data of N＞M) is carried out N point quick Fourier inverse transformation (IFFT with every group of N point after the subcarrier mapping, Inverse Fast Fourier Transformation), the time domain waveform that obtains, this time domain waveform is added Cyclic Prefix, again through and the string conversion just obtain the baseband signal that will launch.
Fig. 3 is based on the structural representation of the PON system of OFDMA in the prior art, as shown in Figure 3, transmitting terminal among OLT and the ONU all mainly is made of OFDM baseband signal, numeral or simulation up-conversion and three parts of electrooptic modulation, up-conversion is different with the electrooptic modulation mode, and light signal also needs to carry out light filtering before inciding optical fiber.And receiving terminal all mainly is made of opto-electronic conversion, electrofiltration ripple, down-conversion and four parts of OFDM baseband signal reception.At up direction, discern for fear of the data generation conflict of each ONU transmission with to ONU, the general method of using wavelength multiplexing, be that each ONU uses different wavelength to send data at up direction, adopt wavelength division multiplex device or optical filter to receive the upstream data of different ONU respectively at the OLT receiving terminal.Utilize the framework of different wavelength in this, will cause the colouredness of ONU, thereby be unfavorable for production and the deployment of ONU at the wavelength multiplexing OFDMA-PON of identical time slot transmission data.
Summary of the invention
In view of this, main purpose of the present invention is to provide a kind of transmission method, Apparatus and system of data, has realized the data transmission scheme of the up colourless property in the OFDM-PON system.
For achieving the above object, technical scheme of the present invention is achieved in that
The invention provides a kind of optical line terminal (OLT), this optical line terminal is used for, and for all optical network units (ONU) distribute up transmission Control Parameter, and the up transmission Control Parameter that will distribute sends to ONU; Also be used for, OFDM (OFDM) modulation signal that each ONU is sent carries out gain controlling and Clock Extraction processing, obtains ofdm modulation signal, and this ofdm modulation signal is handled, and obtains original data-signal.
In the above-mentioned optical line terminal, described optical line terminal further comprises:
The OLT control unit is used to all ONU to distribute up transmission Control Parameter, and the up transmission Control Parameter of distributing is passed through control messages, sends to the ONU that all succeed in registration on the downlink broadcast passage; Described control messages is carried the sign of all OUN that succeed in registration, and the corresponding relation of the sign of ONU and up transmission Control Parameter;
Light burst receiving element is used for the ofdm modulation signal that each ONU sends is carried out automatic gain control and Clock Extraction, recovers ofdm modulation signal, and described ofdm modulation signal is sent to the AD conversion unit of ONU;
AD conversion unit is used for ofdm modulation signal is carried out high-speed sampling and quantification treatment, obtains the OFDM digital radio signal;
Down-converter unit is used for that the OFDM digital radio signal is carried out Digital Down Convert and handles, and obtains OFDM numeral complex baseband signal;
Fast Fourier transform (FFT) unit is used for described OFDM numeral complex baseband signal is transformed to frequency-region signal;
Orthogonal amplitude keying (QAM) demodulating unit is used for the frequency-region signal of FFT unit output is carried out demodulation process.
The present invention also provides a kind of optical network unit, this optical network unit is used for, and according to up transmission Control Parameter the upstream data of input is handled, and obtains ofdm modulation signal, and, utilize the light carrier of identical wavelength that ofdm modulation signal is sent to OLT according to up transmission Control Parameter.
In the above-mentioned optical network unit, described optical network unit further comprises:
The ONU control unit is used for sign and the sign of ONU and the corresponding relation of up transmission Control Parameter according to the ONU of control messages, obtains up transmission Control Parameter from control messages, and offers other unit;
The QAM modulating unit is used for the exponent number m according to the QAM modulation that distributes, and the upstream data of importing is carried out m rank QAM modulation;
Fast Fourier Transform Inverse (IFFT) unit is used for the points N according to the IFFT that distributes, and to carrying out inverse Fourier transform through the QAM modulation symbol that obtains after the QAM modulation, obtains OFDM complex radical band digital signal;
The up-conversion unit is used for that described OFDM complex radical band digital signal is carried out Digital Up Convert and handles;
D/A conversion unit is used for that the OFDM complex radical band digital signal after the described Digital Up Convert processing is carried out digital-to-analogue conversion and handles;
Photoelectric conversion unit is used for described ofdm modulation signal is modulated to light carrier;
Light burst transmissions unit is used for sending time started T as the ONU that distributes
sAfter the arrival, begin to send light carrier, and close in this that sends that length reaches distribution sends, can send the number L of OFDM symbol the time with identical wavelength.
The present invention also provides a kind of transmission system of data, comprising: OLT and ONU; Wherein,
OLT is used to all ONU to distribute up transmission Control Parameter, and the up transmission Control Parameter that will distribute sends to ONU;
ONU is used for according to up transmission Control Parameter the upstream data of input being handled, and obtains ofdm modulation signal, and according to up transmission Control Parameter, utilizes the light carrier of identical wavelength that ofdm modulation signal is sent to OLT.
In the said system, described OLT also is used for, and the ofdm modulation signal that each ONU is sent carries out gain controlling and Clock Extraction processing, obtains ofdm modulation signal, and this ofdm modulation signal is handled, and obtains original data-signal.
The present invention also provides a kind of transmission method of data, comprising:
OLT is up transmission Control Parameter for all ONU distribute, and the up transmission Control Parameter that will distribute sends to ONU;
Each ONU handles the upstream data of input according to up transmission Control Parameter, obtains ofdm modulation signal, and according to up transmission Control Parameter, utilizes the light carrier of identical wavelength that ofdm modulation signal is sent to OLT.
In the said method, this method also comprises:
The ofdm modulation signal that OLT sends each ONU carries out gain controlling and Clock Extraction is handled, and obtains ofdm modulation signal, and this ofdm modulation signal is handled, and obtains original data-signal.
In the said method,
Described up transmission Control Parameter comprises: ONU sends time started T
s, this can send the points N of number L, the IFFT of OFDM symbol, the exponent number m of QAM modulation in sending;
The described up transmission Control Parameter that will distribute sends to ONU and is: the up transmission Control Parameter that the OLT control unit will distribute sends to the ONU that all succeed in registration by control messages on the downlink broadcast passage; Described control messages is carried the sign of all OUN that succeed in registration, and the corresponding relation of the sign of ONU and up transmission Control Parameter.
In the said method, described each ONU is treated to according to the upstream data of up transmission Control Parameter to input:
The ONU control unit obtains up transmission Control Parameter, and offers other unit according to sign and the sign of ONU and the corresponding relation of up transmission Control Parameter of the ONU in the control messages from control messages;
The QAM modulating unit is according to the exponent number m of the QAM modulation that distributes, upstream data to input carries out m rank QAM modulation, the IFFT unit to carrying out inverse Fourier transform through the QAM modulation symbol that obtains after the QAM modulation, obtains OFDM complex radical band digital signal according to the points N of the IFFT that distributes; The up-conversion unit carries out Digital Up Convert to described OFDM complex radical band digital signal to be handled, and the OFDM complex radical band digital signal after D/A conversion unit is handled described Digital Up Convert is carried out digital-to-analogue conversion and handled.
In the said method, described according to up transmission Control Parameter, utilize the light carrier of identical wavelength that ofdm modulation signal is sent to OLT to be:
Light burst transmissions unit by using photoelectric conversion unit is modulated to described ofdm modulation signal on the light carrier, when the ONU that distributes sends time started T
sAfter the arrival, the light of ONU burst transmitting element begins to send the light carrier with identical wavelength, and in the time of can sending the number L of OFDM symbol in this that sends that length reaches distribution sends, light burst transmitting element is closed.
In the said method, the ofdm modulation signal that described OLT sends each ONU carries out gain controlling and Clock Extraction is handled, and obtains ofdm modulation signal and is:
On up direction, after ofdm modulation signal arrives OLT, the ofdm modulation signal that the light burst receiving element of ONU sends each ONU carries out automatic gain control and Clock Extraction, recovers ofdm modulation signal, and described ofdm modulation signal is sent to the AD conversion unit of ONU.
In the said method, described this ofdm modulation signal is treated to:
AD conversion unit is carried out high-speed sampling and quantification treatment to ofdm modulation signal, obtains the OFDM digital radio signal;
Down-converter unit is carried out the Digital Down Convert processing to the OFDM digital radio signal, obtains OFDM numeral complex baseband signal;
The FFT unit is transformed to frequency-region signal with described OFDM numeral complex baseband signal;
The QAM demodulating unit carries out demodulation process to the frequency-region signal of FFT unit output.
The transmission method of data provided by the invention, Apparatus and system, OLT is up transmission Control Parameter for all ONU distribute, and the up transmission Control Parameter that will distribute sends to ONU; Each ONU handles the upstream data of input according to up transmission Control Parameter, obtain ofdm modulation signal, and according to up transmission Control Parameter, utilize the light carrier of identical wavelength that ofdm modulation signal is sent to OLT, overcome coloured problem of the multiplexing OFDMA-PON system uplink of prior art medium wavelength direction ONU, by realize the transfer of data between ONU and the OLT at the light carrier of different time-gap transmission co-wavelength, realized the data transmission scheme of the up colourless property in the OFDM-PON system, thereby reduce transmitter light source management cost, reduce the cost of up link, more help production and the deployment of ONU.
Description of drawings
Fig. 1 is the architectural schematic of EPON in the prior art;
Fig. 2 is the production process schematic diagram of OFDMA baseband signal in the prior art;
Fig. 3 is based on the structural representation of the PON system of OFDMA in the prior art;
Fig. 4 is the structural representation that the present invention realizes the transmission system of data;
Fig. 5 is the schematic flow sheet that the present invention realizes the transmission method of data;
Fig. 6 is the exemplary plot of the transmission system of data of the present invention.
Embodiment
Basic thought of the present invention is: OLT is up transmission Control Parameter for all ONU distribute, and the up transmission Control Parameter that will distribute sends to ONU; Each ONU handles the upstream data of input according to up transmission Control Parameter, obtains ofdm modulation signal, and according to up transmission Control Parameter, utilizes the light carrier of identical wavelength that ofdm modulation signal is sent to OLT.
Below by drawings and the specific embodiments the present invention is described in further detail again.
The invention provides a kind of transmission system of data, Fig. 4 is the structural representation that the present invention realizes the transmission system of data, and as shown in Figure 4, this system comprises: OLT 41 and ONU 42; Wherein,
OLT 41, are used to all ONU to distribute up transmission Control Parameter, and the up transmission Control Parameter that will distribute sends to ONU 42;
ONU 42, are used for according to up transmission Control Parameter the upstream data of input being handled, and obtain ofdm modulation signal, and according to up transmission Control Parameter, utilize the light carrier of identical wavelength that ofdm modulation signal is sent to OLT 41.
Described OLT 41 also is used for, and the ofdm modulation signal that each ONU 42 is sent carries out gain controlling and Clock Extraction processing, obtains ofdm modulation signal, and this ofdm modulation signal is handled, and obtains original data-signal.
This OLT 41 further comprises:
OLT control unit 411 is used to all ONU to distribute up transmission Control Parameter, and the up transmission Control Parameter of distributing is passed through control messages, sends to the ONU that all succeed in registration on the downlink broadcast passage; Described control messages is carried the sign of all OUN that succeed in registration, and the corresponding relation of the sign of ONU and up transmission Control Parameter;
Light burst receiving element 412 is used for the ofdm modulation signal that each ONU sends is carried out automatic gain control and Clock Extraction, recovers ofdm modulation signal, and described ofdm modulation signal is sent to the AD conversion unit 413 of ONU;
AD conversion unit 413 is used for ofdm modulation signal is carried out high-speed sampling and quantification treatment, obtains the OFDM digital radio signal;
Down-converter unit 414 is used for that the OFDM digital radio signal is carried out Digital Down Convert and handles, and obtains OFDM numeral complex baseband signal;
FFT unit 415 is used for described OFDM numeral complex baseband signal is transformed to frequency-region signal;
QAM demodulating unit 416 is used for the frequency-region signal of FFT unit output is carried out demodulation process.
This ONU 42 further comprises:
ONU control unit 421 is used for sign and the sign of ONU and the corresponding relation of up transmission Control Parameter according to the ONU of control messages, obtains up transmission Control Parameter from control messages, and offers other unit;
QAM modulating unit 422 is used for the exponent number m according to the QAM modulation that distributes, and the upstream data of importing is carried out m rank QAM modulation;
IFFT unit 423 is used for the points N according to the IFFT that distributes, and to carrying out inverse Fourier transform through the QAM modulation symbol that obtains after the QAM modulation, obtains OFDM complex radical band digital signal;
Up-conversion unit 424 is used for that described OFDM complex radical band digital signal is carried out Digital Up Convert and handles;
D/A conversion unit 425 is used for that the OFDM complex radical band digital signal after the described Digital Up Convert processing is carried out digital-to-analogue conversion and handles;
Photoelectric conversion unit 426 is used for described ofdm modulation signal is modulated to light carrier;
Light burst transmissions unit 427 is used for sending time started T as the ONU that distributes
sAfter the arrival, begin to send light carrier, and close in this that sends that length reaches distribution sends, can send the number L of OFDM symbol the time with identical wavelength.
In the embodiment of the invention, in the transmission system of data, the quantity of ONU is a plurality of.
Based on said system, the present invention also provides a kind of transmission method of data, and Fig. 5 is the schematic flow sheet that the present invention realizes the transmission method of data, and as shown in Figure 5, this method may further comprise the steps:
Step 501, OLT is up transmission Control Parameter for all ONU distribute, and the up transmission Control Parameter that will distribute sends to ONU;
Concrete, as shown in Figure 6,, comprising an OLT at receiver side, this OLT comprises a light burst receiving element, an AD conversion unit, a down-converter unit, a N point FFT unit, a m rank QAM demodulating unit and an OLT control unit;
After ONU power-up initializing process was finished, OLT was that all unregistered ONU open log-in window, is used for registration and the range finding of ONU; When ONU after OLT successfully registers, the OLT control unit will distribute up transmission Control Parameter for all ONU that successfully register; Wherein, up transmission Control Parameter comprises: ONU sends time started T
s, this can send the points N of number L, the IFFT of OFDM symbol, the exponent number m and the assist control parameter of QAM modulation in sending; The up transmission Control Parameter that the OLT control unit will distribute sends to the ONU that all succeed in registration by control messages on the downlink broadcast passage; Here, need to carry the sign of all OUN that succeed in registration in the control messages, the corresponding relation of the sign of for example ONU ID, and ONU and up transmission Control Parameter;
The assist control parameter of distributing to ONU comprises: circulating prefix-length N
CPAnd the length of each OFDM symbol is N+N
CP, for example, splitting ratio is 1: 32, each ONU sends ofdm modulation signal to OLT in the sending time slots that OLT distributes; If uplink speed is MGbps, the exponent number of QAM modulation is m, and FFT counts and is that N, circulating prefix-length are N
CP, OLT distributes to the number L of the OFDM symbol of ONU transmission, and the up sending time slots length of this ONU is through being calculated as like this
OLT sends time started T according to sending time slots length and the ONU of this ONU that calculates
s, be calculated as the ONU transmission time started T that next ONU distributes
sONU will send ofdm modulation signal to OLT in above-mentioned up sending time slots; In addition, the assist control parameter can also comprise the indication of ONU power level, is used for the OLT receiver and adjusts received power in real time.
Step 502, each ONU handles the upstream data of input according to up transmission Control Parameter, obtains ofdm modulation signal, and according to up transmission Control Parameter, utilizes identical wavelength that ofdm modulation signal is sent to OLT;
Concrete, as shown in Figure 6, at transmitter side, comprise a plurality of ONU, and each ONU is just the same, all comprises a QAM modulating unit, IFFT unit, up-conversion unit, D/A conversion unit and a light burst transmissions unit, a photoelectric conversion unit and an ONU control unit; Here because the ONU of transmitter side is duplicate, therefore the photoelectric conversion unit that adopts is also identical, laser in the photoelectric conversion unit is also identical, the wavelength of being used to of guaranteeing that each ONU uses being launched ofdm modulation signal is identical, therefore the ofdm modulation signal that sends for fear of ONU clashes, and therefore need send ofdm modulation signal according to different sending time slots;
The ONU control unit is according to sign and the sign of ONU and the corresponding relation of up transmission Control Parameter of the ONU in the control messages, obtains the up transmission Control Parameter that belongs to self place ONU from control messages, and offers other unit among the ONU;
Each ONU can receive the upstream data of input, and according to up transmission Control Parameter this upstream data is handled, and obtains ofdm modulation signal, and concrete processing procedure is as follows:
After upstream data was input to ONU, the QAM modulating unit carried out QAM modulation in m rank according to the exponent number m of the QAM modulation that distributes to this upstream data, and promptly every m bit is mapped as a QAM modulation symbol, and the symbol after the modulation is represented with plural form, as C
i=A
i+ jB
i, and so that real part and imaginary part are outputed to the IFFT unit respectively; Described QAM modulation can be quarternary phase-shift keying (QPSK) signal (QPSK, Quadrature Phase Shift Keying) or 16QAM etc.;
The IFFT unit is according to the points N of the IFFT that distributes, to carrying out inverse Fourier transform through the QAM modulation symbol that obtains after the QAM modulation, the QAM modulation symbol is modulated onto on each parallel subcarrier, import the time-domain symbol of serial again, finish conversion from frequency-region signal to the time domain signal, obtain OFDM complex radical band digital signal, and export to the up-conversion unit; Here, in the IFFT unit, IFFT counts and is N, and the subcarrier that wherein is actually used in transfer of data is P, and (P＜N), remaining subcarrier is used to insert frequency pilot sign, is further used for channel estimating and equilibrium, or protects at interval as over-sampling after the zero setting;
The up-conversion unit carries out Digital Up Convert to OFDM complex radical band digital signal to be handled, and intermediate frequency f is arrived in the digital signal conversion of OFDM complex radical band
IFFrequency range or radio frequency f
RFFrequency range is used for channels transmit; For example, the up-conversion unit adopts the digital quadrature frequency variation method, is the radio frequency real signal with the digital signal conversion of OFDM complex radical band;
OFDM complex radical band digital signal after Digital Up Convert is handled also belongs to discrete signal in itself, therefore the OFDM complex radical band digital signal after D/A conversion unit must be handled this Digital Up Convert is carried out digital-to-analogue conversion and is handled, OFDM complex radical band digital signal is converted to continuous analog signal, obtain ofdm modulation signal to be sent, could on channel, send; Here, owing to OFDM complex radical band digital signal has been finished upconversion process and has been converted to the radio frequency real signal, so D/A conversion unit can directly be finished digital-to-analogue conversion;
Light burst transmissions unit by using photoelectric conversion unit is modulated to ofdm modulation signal to be sent on the light carrier, and here, the wavelength of light carrier that being used among all ONU sends ofdm modulation signal is identical; When the ONU that distributes sends time started T
sAfter the arrival, the light of ONU burst transmitting element is opened, and begins to send the light carrier with identical wavelength, in the time of can sending the number L of OFDM symbol in this that sends that length reaches distribution sends, the light burst transmitting element of ONU is closed, and finishes the process of transmitting of ofdm modulation signal.
Step 503, the ofdm modulation signal that OLT sends each ONU carry out gain controlling and Clock Extraction is handled, and obtains ofdm modulation signal, and this ofdm modulation signal is handled, and obtains original data-signal;
Concrete, on up direction, after ofdm modulation signal arrived OLT, at first the light burst receiving element by ONU received processing to the ofdm modulation signal that each ONU sends, this reception is handled and is comprised automatic gain control and Clock Extraction, is used to recover ofdm modulation signal; This ofdm modulation signal carries out up transmission by each ONU at the up sending time slots that is distributed in the mode of burst, so OLT must adjust and receive parameter to guarantee correct reception according to power and the distance of each ONU; The burst receiving element of OLT sends to AD conversion unit after the ofdm modulation signal that receives in each up sending time slots is received processing;
AD conversion unit is carried out high-speed sampling and quantification treatment to ofdm modulation signal, finishes digitized process, and ofdm modulation signal is converted to the OFDM digital radio signal, and the OFDM digital radio signal is sent to down-converter unit;
Down-converter unit is carried out Digital Down Convert to the OFDM digital radio signal and is handled, make the OFDM digital radio signal directly become OFDM numeral complex baseband signal by radiofrequency signal or intermediate-freuqncy signal, here, the OFDM digital radio signal becomes complex signal by real signal, and exports to the FFT unit with the form of real part and imaginary part;
The FFT unit is transformed to frequency-region signal with the OFDM numeral complex baseband signal of input by time-domain signal, promptly demodulates ONU in the current time slots and is modulated at upstream data on each subcarrier;
The QAM demodulating unit on m rank carries out demodulation process to the frequency-region signal of FFT unit output, and then recovers original data-signal;
Said process is the operation that up ofdm modulation signal that ONU sends the ONU in each up sending time slots successively carries out, and can recover the up original data-signal of each ONU.
The above is preferred embodiment of the present invention only, is not to be used to limit protection scope of the present invention, all any modifications of being done within the spirit and principles in the present invention, is equal to and replaces and improvement etc., all should be included within protection scope of the present invention.
Claims (13)
1. an optical line terminal (OLT) is characterized in that, this optical line terminal is used for, and for all optical network units (ONU) distribute up transmission Control Parameter, and the up transmission Control Parameter that will distribute sends to ONU; Also be used for, OFDM (OFDM) modulation signal that each ONU is sent carries out gain controlling and Clock Extraction processing, obtains ofdm modulation signal, and this ofdm modulation signal is handled, and obtains original data-signal.
2. optical line terminal according to claim 1 is characterized in that, described optical line terminal further comprises:
The OLT control unit is used to all ONU to distribute up transmission Control Parameter, and the up transmission Control Parameter of distributing is passed through control messages, sends to the ONU that all succeed in registration on the downlink broadcast passage; Described control messages is carried the sign of all OUN that succeed in registration, and the corresponding relation of the sign of ONU and up transmission Control Parameter;
Light burst receiving element is used for the ofdm modulation signal that each ONU sends is carried out automatic gain control and Clock Extraction, recovers ofdm modulation signal, and described ofdm modulation signal is sent to the AD conversion unit of ONU;
AD conversion unit is used for ofdm modulation signal is carried out high-speed sampling and quantification treatment, obtains the OFDM digital radio signal;
Down-converter unit is used for that the OFDM digital radio signal is carried out Digital Down Convert and handles, and obtains OFDM numeral complex baseband signal;
Fast Fourier transform (FFT) unit is used for described OFDM numeral complex baseband signal is transformed to frequency-region signal;
Orthogonal amplitude keying (QAM) demodulating unit is used for the frequency-region signal of FFT unit output is carried out demodulation process.
3. an optical network unit is characterized in that, this optical network unit is used for, according to up transmission Control Parameter the upstream data of input is handled, obtain ofdm modulation signal, and, utilize the light carrier of identical wavelength that ofdm modulation signal is sent to OLT according to up transmission Control Parameter.
4. optical network unit according to claim 3 is characterized in that, described optical network unit further comprises:
The ONU control unit is used for sign and the sign of ONU and the corresponding relation of up transmission Control Parameter according to the ONU of control messages, obtains up transmission Control Parameter from control messages, and offers other unit;
The QAM modulating unit is used for the exponent number m according to the QAM modulation that distributes, and the upstream data of importing is carried out m rank QAM modulation;
Fast Fourier Transform Inverse (IFFT) unit is used for the points N according to the IFFT that distributes, and to carrying out inverse Fourier transform through the QAM modulation symbol that obtains after the QAM modulation, obtains OFDM complex radical band digital signal;
The up-conversion unit is used for that described OFDM complex radical band digital signal is carried out Digital Up Convert and handles;
D/A conversion unit is used for that the OFDM complex radical band digital signal after the described Digital Up Convert processing is carried out digital-to-analogue conversion and handles;
Photoelectric conversion unit is used for described ofdm modulation signal is modulated to light carrier;
Light burst transmissions unit is used for sending time started T as the ONU that distributes
sAfter the arrival, begin to send light carrier, and close in this that sends that length reaches distribution sends, can send the number L of OFDM symbol the time with identical wavelength.
5. the transmission system of data is characterized in that, this system comprises: OLT and ONU; Wherein,
OLT is used to all ONU to distribute up transmission Control Parameter, and the up transmission Control Parameter that will distribute sends to ONU;
ONU is used for according to up transmission Control Parameter the upstream data of input being handled, and obtains ofdm modulation signal, and according to up transmission Control Parameter, utilizes the light carrier of identical wavelength that ofdm modulation signal is sent to OLT.
6. system according to claim 5 is characterized in that described OLT also is used for, the ofdm modulation signal that each ONU is sent carries out gain controlling and Clock Extraction processing, obtain ofdm modulation signal, and this ofdm modulation signal is handled, obtain original data-signal.
7. the transmission method of data is characterized in that, this method comprises:
OLT is up transmission Control Parameter for all ONU distribute, and the up transmission Control Parameter that will distribute sends to ONU;
Each ONU handles the upstream data of input according to up transmission Control Parameter, obtains ofdm modulation signal, and according to up transmission Control Parameter, utilizes the light carrier of identical wavelength that ofdm modulation signal is sent to OLT.
8. method according to claim 7 is characterized in that, this method also comprises:
The ofdm modulation signal that OLT sends each ONU carries out gain controlling and Clock Extraction is handled, and obtains ofdm modulation signal, and this ofdm modulation signal is handled, and obtains original data-signal.
9. method according to claim 7 is characterized in that,
Described up transmission Control Parameter comprises: ONU sends time started T
s, this can send the points N of number L, the IFFT of OFDM symbol, the exponent number m of QAM modulation in sending;
The described up transmission Control Parameter that will distribute sends to ONU and is: the up transmission Control Parameter that the OLT control unit will distribute sends to the ONU that all succeed in registration by control messages on the downlink broadcast passage; Described control messages is carried the sign of all OUN that succeed in registration, and the corresponding relation of the sign of ONU and up transmission Control Parameter.
10. method according to claim 9 is characterized in that, described each ONU is treated to according to the upstream data of up transmission Control Parameter to input:
The ONU control unit obtains up transmission Control Parameter, and offers other unit according to sign and the sign of ONU and the corresponding relation of up transmission Control Parameter of the ONU in the control messages from control messages;
The QAM modulating unit is according to the exponent number m of the QAM modulation that distributes, upstream data to input carries out m rank QAM modulation, the IFFT unit to carrying out inverse Fourier transform through the QAM modulation symbol that obtains after the QAM modulation, obtains OFDM complex radical band digital signal according to the points N of the IFFT that distributes; The up-conversion unit carries out Digital Up Convert to described OFDM complex radical band digital signal to be handled, and the OFDM complex radical band digital signal after D/A conversion unit is handled described Digital Up Convert is carried out digital-to-analogue conversion and handled.
11. method according to claim 9 is characterized in that, and is described according to up transmission Control Parameter, utilizes the light carrier of identical wavelength that ofdm modulation signal is sent to OLT to be:
Light burst transmissions unit by using photoelectric conversion unit is modulated to described ofdm modulation signal on the light carrier, when the ONU that distributes sends time started T
sAfter the arrival, the light of ONU burst transmitting element begins to send the light carrier with identical wavelength, and in the time of can sending the number L of OFDM symbol in this that sends that length reaches distribution sends, light burst transmitting element is closed.
12. method according to claim 8 is characterized in that, the ofdm modulation signal that described OLT sends each ONU carries out gain controlling and Clock Extraction is handled, and obtains ofdm modulation signal and is:
On up direction, after ofdm modulation signal arrives OLT, the ofdm modulation signal that the light burst receiving element of ONU sends each ONU carries out automatic gain control and Clock Extraction, recovers ofdm modulation signal, and described ofdm modulation signal is sent to the AD conversion unit of ONU.
13. method according to claim 8 is characterized in that, described this ofdm modulation signal is treated to:
AD conversion unit is carried out high-speed sampling and quantification treatment to ofdm modulation signal, obtains the OFDM digital radio signal;
Down-converter unit is carried out the Digital Down Convert processing to the OFDM digital radio signal, obtains OFDM numeral complex baseband signal;
The FFT unit is transformed to frequency-region signal with described OFDM numeral complex baseband signal;
The QAM demodulating unit carries out demodulation process to the frequency-region signal of FFT unit output.
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