CN105264851B

CN105264851B - Transmit the methods, devices and systems of signal

Info

Publication number: CN105264851B
Application number: CN201380002805.3A
Authority: CN
Inventors: 彭桂开; 周雷; 湛永坚; 王振平
Original assignee: Huawei Technologies Co Ltd
Current assignee: Pinghu Xinna Communication Technology Co ltd
Priority date: 2013-11-13
Filing date: 2013-11-13
Publication date: 2018-11-16
Anticipated expiration: 2033-11-13
Also published as: WO2015070395A1; CN105264851A

Abstract

The embodiment of the invention provides a kind of methods for transmitting signal, can reduce the sample rate requirement of digital analog converter at low cost, and then reduce the cost of communication equipment and network construction, and this method includes：The transmitting terminal obtains the target number signal for needing to be sent to receiving end；The transmitting terminal determines target DAC corresponding with target frequency bands from least two DAC, wherein the target frequency bands are that the transmitting terminal carries out communicating the frequency range used with the receiving end, which belongs to feature Nyquist domain corresponding to target DAC；The transmitting terminal is handled the target number signal by target DAC, to generate target simulation signal；The transmitting terminal sends the target simulation signal to the receiving end by the target frequency bands.

Description

Transmit the methods, devices and systems of signal

Technical field

The present invention relates to the communications fields, and more particularly, to the methods, devices and systems of transmission signal.

Background technique

The channel given is divided into many orthogonal subchannels in frequency domain by a kind of multi-carrier modulation technology known, It is modulated on every sub-channels using a subcarrier, subcarrier can be used high order modulation and improve power system capacity, and each The data flow of high speed can be assigned to several subcarrier low speed transmissions by subcarrier parallel transmission, this parallel transmission technology.

For example, in a kind of point-to-multipoint Transmission system, the data of whole system (are needed to be sent to multiple connect by transmitting terminal Receiving end) it is carried on a single band progress multi-carrier modulation, modulated data are broadcast to all receiving ends, Mei Gejie Receiving end must receive the data in entire frequency band, then carry out demodulation and receive to one's name subcarrier.This transmission mode, for The digital analog converter of transmitting terminal requires very high, it is assumed that transmission band 10GHz, then at least needing sample rate is the number of 20GSps Mode converter, device cost is high at present, unacceptable for the access network stringent for cost requirement.

A kind of possible mode is transmitting terminal in the same direction orthogonal (I/Q, the In- different using centre frequency in analog domain Phase/Quadrature) modulator upconverts to multiple baseband signals on different frequency bands, forms multi-band signal and is sent to Receiving end.

But the I/Q modulator of high speed is difficult to obtain, cost is still difficult to decline.Further, since I/Q modem Same phase and orthogonal two branch it is inconsistent, for example, it may be possible to which there are the gain differences of frequency mixer to lead to amplitude imbalance, two local oscillators The phase difference of signal, which is not stringent 90 °, leads to unbalance in phase, also, there are the unbalanced problem of I/Q two-way, can cause base Variation with i/q signal, i.e. generation I/Q imbalance problem, eventually lead to performance deterioration.

Accordingly, it is desirable to provide a kind of method for transmitting signal, the sample rate that can reduce digital analog converter at low cost are wanted It asks.

Summary of the invention

The embodiment of the present invention provides a kind of methods, devices and systems for transmitting signal, can reduce digital-to-analogue at low cost and turn The sample rate requirement of parallel operation, and then reduce the cost of communication equipment and network construction.

In a first aspect, providing a kind of method for transmitting signal, executed by the transmitting terminal in communication system, transmitting terminal tool There are at least two digital analog converter DAC, respectively feature Nyquist domain corresponding to the DAC is different, wherein this feature Nyquist Domain be the processing through corresponding DAC and the maximum output intensity of analog signal that generates at Nyquist domain, this is extremely The sample rate that few two DAC are used is identical, and the system bandwidth which uses is divided at least two frequency ranges, the frequency Section belongs to feature Nyquist domain, this method corresponding to a DAC and includes：Transmitting terminal acquisition needs to be sent to receiving end Target number signal；The transmitting terminal determines target DAC corresponding with target frequency bands from least two DAC, wherein the mesh Marking frequency range is that the transmitting terminal carries out communicating the frequency range used with the receiving end, which belongs to corresponding to target DAC Feature Nyquist domain；The transmitting terminal is handled the target number signal by target DAC, to generate target simulation letter Number；The transmitting terminal sends the target simulation signal to the receiving end by the target frequency bands.

With reference to first aspect, in the first implementation of first aspect, the feature corresponding to the target DAC how Kui When this special domain is not the first Nyquist domain, this method further includes：The transmitting terminal sends Nyquist domain to the receiving end and indicates Information, Nyquist domain instruction information are used to indicate Nyquist domain at the target frequency bands.

With reference to first aspect and its above-mentioned implementation, in second of implementation of first aspect, the transmitting terminal from Target DAC corresponding with target frequency bands is determined at least two DAC, including：The transmitting terminal receives receiving end transmission Registration request；The transmitting terminal is according to the registration request, from least two frequency range, distributes the target frequency bands for the receiving end； The transmitting terminal determines target DAC according to the target frequency bands from least two DAC；And this method further includes：The transmitting terminal The frequency range instruction information for being used to indicate the target frequency bands is sent to the receiving end.

With reference to first aspect and its above-mentioned implementation, in the third implementation of first aspect, the transmitting terminal from Target DAC corresponding with target frequency bands is determined at least two DAC, including：The transmitting terminal obtains mapping item, the mapping List item records the mapping relations between the receiving end and the target frequency bands；The transmitting terminal searches the mapping table according to the receiving end , to determine the target frequency bands；The transmitting terminal determines target DAC according to the target frequency bands.

With reference to first aspect and its above-mentioned implementation, in the 4th kind of implementation of first aspect, the receiving end energy Any frequency range in enough at least two frequency ranges is communicated and the transmitting terminal determining and target from least two DAC The corresponding target DAC of frequency range, including：The transmitting terminal is using any DAC at least two DAC as target DAC；The hair Sending end determines the target frequency bands from feature Nyquist domain corresponding to target DAC；And this method further includes：The hair Sending end sends the frequency range instruction information for being used to indicate the target frequency bands to the receiving end.

With reference to first aspect and its above-mentioned implementation, in the 5th kind of implementation of first aspect, in the transmitting terminal By the target frequency bands, before sending the target simulation signal to the receiving end, this method further includes：The transmitting terminal carries out first Filtering processing, to retain the feature Nyquist domain corresponding to the target DAC or the target frequency of the target simulation signal The part of section.

With reference to first aspect and its above-mentioned implementation, in the 6th kind of implementation of first aspect, in the transmitting terminal By the target frequency bands, before sending the target simulation signal to the receiving end, this method further includes：The transmitting terminal carries out second Filtering processing, to retain the target simulation signal in the feature Nyquist domain corresponding to target DAC or the target frequency bands.

Second aspect, provides a kind of method for transmitting signal, and this method includes：The receiving end determines target frequency bands, should Target frequency bands are that the transmitting terminal carries out communicating the frequency range used with the receiving end；According to the target frequency bands, obtaining should for the receiving end The target simulation signal that transmitting terminal is sent；The receiving end receive the transmitting terminal transmission Nyquist domain instruction information, this how Kui This special domain instruction information is used to indicate Nyquist domain at the target frequency bands；The receiving end refers to according to the Nyquist domain Show information, determines respective components of the target simulation signal in the first Nyquist domain；The receiving end is according to the target simulation Respective components of the signal in the first Nyquist domain carry out analog-to-digital conversion process to the target simulation signal.

In conjunction with second aspect, in the first implementation of second aspect, which determines target frequency bands, including： The receiving end receives the frequency range instruction information for being used to indicate the target frequency bands of transmitting terminal transmission, which is the transmission End is receiving end distribution from least two frequency range；The receiving end indicates information according to the frequency range, determines target frequency Section.

In conjunction with second aspect and its above-mentioned implementation, in second of implementation of second aspect, in the receiving end Before the frequency range instruction information for being used to indicate the target frequency bands for receiving transmitting terminal transmission, this method further includes：The receiving end Registration request is sent to the transmitting terminal, in order to which the transmitting terminal is the reception from least two frequency range according to the registration request The target frequency bands are distributed at end, and send frequency range instruction information.

In conjunction with second aspect and its above-mentioned implementation, in the third implementation of second aspect, the receiving end is true Set the goal frequency range, including：The receiving end obtains mapping item, and mapping item record has between the receiving end and the target frequency bands Mapping relations；The mapping item is searched in the receiving end, to determine the target frequency bands.

The third aspect, provides a kind of device for transmitting signal, which includes：At least two digital analog converter DAC, respectively Feature Nyquist domain corresponding to the DAC is different, wherein this feature Nyquist domain be the processing through corresponding DAC and Nyquist domain at the maximum output intensity of the analog signal of generation, the sample rate which uses is identical, The system bandwidth that the communication system uses is divided at least two frequency ranges, and the frequency range belongs to feature corresponding to a DAC Nyquist domain；Acquiring unit needs to be sent to the target number signal of receiving end for obtaining；Determination unit is used for from this Target DAC corresponding with target frequency bands is determined at least two DAC, wherein the target frequency bands are the device and the receiving end The frequency range that communication uses is carried out, which belongs to feature Nyquist domain corresponding to target DAC；Generation unit is used In being handled by target DAC the target number signal, to generate target simulation signal；Transmit-Receive Unit, for passing through The target frequency bands send the target simulation signal to the receiving end.

In conjunction with the third aspect, in the first implementation of the third aspect, the feature corresponding to the target DAC how Kui When this special domain is not the first Nyquist domain, which is also used to send instruction information in Nyquist domain to the receiving end, Nyquist domain instruction information is used to indicate Nyquist domain at the target frequency bands.

In conjunction with the third aspect and its above-mentioned implementation, in second of implementation of the third aspect, the Transmit-Receive Unit It is also used to receive the registration request of receiving end transmission；The determination unit is also used to according to the registration request, from this at least two In frequency range, the target frequency bands are distributed for the receiving end, and according to the target frequency bands, target is determined from least two DAC DAC；The Transmit-Receive Unit is also used to send the frequency range for being used to indicate the target frequency bands to the receiving end and indicates information.

In conjunction with the third aspect and its above-mentioned implementation, in the third implementation of the third aspect, the acquiring unit It is also used to obtain mapping item, mapping item record has the mapping relations between each receiving end and each frequency range；The determination unit Specifically for searching the mapping item according to the receiving end, to determine the target frequency bands, and according to the target frequency bands, determining should Target DAC.

In conjunction with the third aspect and its above-mentioned implementation, in the 4th kind of implementation of the third aspect, the receiving end energy Any frequency range in enough at least two frequency ranges is communicated and the determination unit be specifically used for will be at least two DAC Any DAC as target DAC, and from feature Nyquist domain corresponding to target DAC, determine the target frequency bands； The Transmit-Receive Unit is also used to send the frequency range for being used to indicate the target frequency bands to the receiving end and indicates information.

In conjunction with the third aspect and its above-mentioned implementation, in the 5th kind of implementation of the third aspect, the generation unit It is also used to carry out the first filtering processing, only to retain the right in the target frequency bands or the target DAC of the target simulation signal The part in the feature Nyquist domain answered.

In conjunction with the third aspect and its above-mentioned implementation, in the 6th kind of implementation of the third aspect, the generation unit It is also used to carry out the second filtering processing, only to protect in the feature Nyquist domain corresponding to the target frequency bands or target DAC Stay the target simulation signal.

Fourth aspect, provides a kind of device for transmitting signal, which includes：Determination unit, for determining target frequency Section, which is that transmitting terminal carries out communicating the frequency range used with the device；Transmit-Receive Unit is used for according to the target frequency bands, Obtain the transmitting terminal transmission target simulation signal, and receive the transmitting terminal transmission Nyquist domain instruction information, this how Kui This special domain instruction information is used to indicate Nyquist domain at the target frequency bands；Processing unit, for according to the Nai Kuisi Special domain indicates information, determines respective components of the target simulation signal in the first Nyquist domain, and according to the target simulation Respective components of the signal in the first Nyquist domain carry out analog-to-digital conversion process to the target simulation signal, to obtain the mesh Mark digital signal.

In conjunction with fourth aspect, in the first implementation of fourth aspect, which is also used to receive the transmission The frequency range instruction information that end was sent be used to indicate the target frequency bands, the target frequency bands are the transmitting terminals from least two frequency range In for the receiving end distribution；The determination unit is specifically used for indicating information according to the frequency range, determines the target frequency bands.

In conjunction with fourth aspect and its above-mentioned implementation, in second of implementation of fourth aspect, the Transmit-Receive Unit It is also used to send registration request to the transmitting terminal, in order to which the transmitting terminal is from least two frequency range according to the registration request The target frequency bands are distributed in the receiving end, and send frequency range instruction information.

In conjunction with fourth aspect and its above-mentioned implementation, in the third implementation of fourth aspect, the determination unit It is also used to obtain mapping item, mapping item record has the mapping relations between the receiving end and the target frequency bands；For looking into The mapping item is looked for, to determine the target frequency bands.

5th aspect provides a kind of system for transmitting signal, which includes transmitting terminal and at least one receiving end, is somebody's turn to do At least two digital analog converter DAC of transmitting terminal, respectively feature Nyquist domain corresponding to the DAC is different, wherein this feature how Kui This special domain be the processing through corresponding DAC and the maximum output intensity of analog signal that generates at Nyquist domain, The sample rate that at least two DAC is used is identical, and the system bandwidth which uses is divided at least two frequency ranges, and one The frequency range belongs to feature Nyquist domain corresponding to a DAC and the transmitting terminal and needs to be sent to receiving end for obtaining Target number signal, target DAC corresponding with target frequency bands is determined from least two DAC, wherein the target frequency bands It is that the transmitting terminal carries out communicating the frequency range used with the receiving end, how which belongs to feature corresponding to target DAC Qwest domain handles the target number signal by target DAC, to generate target simulation signal, passes through the target Frequency range sends the target simulation signal to the receiving end；It, according to the target frequency bands, is obtained for determining target frequency bands the receiving end The target simulation signal for taking the transmitting terminal to send receives the Nyquist domain instruction information of transmitting terminal transmission, the Nyquist Domain instruction information is used to indicate Nyquist domain at the target frequency bands, indicates information according to the Nyquist domain, determines Respective components of the target simulation signal in the first Nyquist domain, according to the target simulation signal in the first Nyquist domain In respective components, to the target simulation signal carry out analog-to-digital conversion process.

The methods, devices and systems of transmission signal according to an embodiment of the present invention, by configuring multiple DAC in transmitting terminal, Make to be located at different Nyquist domains through the maximum output intensity of each DAC treated analog signal, and is in system bandwidth Different frequency ranges is distributed in each receiving end, and transmitting terminal is when sending data to receiving end, according to frequency range corresponding with the receiving end Selection target DAC, so that target frequency bands belong to Qwest domain at the maximum output intensity of target DAC, and to the mesh Mark DAC handles the data for needing to be sent to the receiving end, to generate target simulation signal, and then is sent to the reception End, so that receiving end can identify target simulation signal, therefore, each DAC's adopts according to its corresponding frequency range from system bandwidth Sample rate so as to reduce the requirement to DAC sample rate, and then reduces communication without corresponding with the highest frequency of system bandwidth Equipment and the cost of network construction.

Detailed description of the invention

In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be in embodiment or description of the prior art Required attached drawing is briefly described, it should be apparent that, the accompanying drawings in the following description is only some realities of the invention Example is applied, it for those of ordinary skill in the art, without creative efforts, can also be according to these attached drawings Obtain other attached drawings.

Fig. 1 is the schematic flow chart of the method for transmission data according to an embodiment of the invention.

Fig. 2 is the schematic diagram for indicating maximum output intensity distribution of the DAC under using different shock response curve modes.

Fig. 3 is the schematic diagram for indicating the frequency spectrum shift effect of Undersampling technique.

Fig. 4 is the schematic interaction figure of the method for transmission data according to an embodiment of the invention.

Fig. 5 is the schematic flow chart of the method for transmission data according to another embodiment of the present invention.

Fig. 6 is the schematic block diagram of the device of transmission data according to an embodiment of the invention.

Fig. 7 is the schematic block diagram of the device of transmission data according to another embodiment of the present invention.

Fig. 8 is the schematic diagram of the equipment of transmission data according to an embodiment of the invention.

Fig. 9 is the schematic diagram of the equipment of transmission data according to another embodiment of the present invention.

Figure 10 is the schematic block diagram of the system of transmission data according to an embodiment of the invention.

Specific embodiment

Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete Site preparation description, it is clear that described embodiments are some of the embodiments of the present invention, instead of all the embodiments.Based on this hair Embodiment in bright, every other implementation obtained by those of ordinary skill in the art without making creative efforts Example, shall fall within the protection scope of the present invention.

Fig. 1 is the schematic flow chart of the method 100 of transmission data according to an embodiment of the invention.This method 100 by Transmitting terminal in communication system executes, which has at least two digital analog converter DAC, respectively feature corresponding to the DAC Nyquist domain is different, wherein this feature Nyquist domain be the processing through corresponding DAC and the analog signal that generates most Nyquist domain at big output intensity, the sample rate which uses is identical, and what which used is Command it is wide be divided at least two frequency ranges, the frequency range belongs to feature Nyquist domain corresponding to a DAC, such as Fig. 1 institute Show, this method 100 includes：

S110, the transmitting terminal obtain the target number signal for needing to be sent to receiving end；

S120, the transmitting terminal determine target DAC corresponding with target frequency bands from least two DAC, wherein the mesh Marking frequency range is that the transmitting terminal carries out communicating the frequency range used with the receiving end, which belongs to corresponding to target DAC Feature Nyquist domain；

S130, the transmitting terminal are handled the target number signal by target DAC, to generate target simulation letter Number；

S140, the transmitting terminal send the target simulation signal to the receiving end by the target frequency bands.

Technical solution of the present invention, can be applied to it is various need that transmitting terminal is made to convert digital signals into analog signal, And by the way of wireless communication or optic communication, which is sent to the communication system of receiving end, such as：Passive In optical-fiber network (PON, Passive Optical Network), a piece trunk optical fiber of PON local side, that is, can be divided into it is tens of even More multi-channel optical fibre connects user, substantially reduces networking cost.At present PON technology mainly have ethernet passive optical network (EPON, Ethernet Passive Optical Network) and gigabit passive optical network (GPON, Gigabit-Capable Passive Optical Network) etc. it is several, main difference be use two layers of different technologies.Existing EPON Orthogonal frequency division multiplexing-passive optical network (OFDM-PON, Orthogonal Frequency can be used with GPON product Division Multiplexing Passive Optical Network) etc. different technologies scheme.OFDM-PON technology is not only Transmitting terminal and receiving end Electric signal processing can be introduced to eliminate various damages, may be incorporated into high order modulation reduces various photoelectricity The bandwidth requirement of device, furthermore the technology also has many advantages, such as the multiple access access of high efficient and flexible and resource allocation methods, therefore obtains Industry has been arrived widely to pay close attention to.

In pon, optical line terminal (OLT Optical Line Terminal) can be with one or more optical-fiber network lists First (ONU, Optical Network Unit) communication connection, also, an ONU can be used PON system bandwidth (or Say, system carrier) in a part of frequency range (in other words, subcarrier) communicated, in the downlink transmission process of PON, OLT need The data of each ONU will be sent to, then multi-carrier modulation is broadcasted to whole system bandwidth to each ONU.

Hereinafter, in order to facilitate understanding and explanation, by the embodiment of the present invention transmission signal method 100 be suitable for PON When process (specifically, being downlink transmission process) for, be illustrated, in this case, OLT is equivalent to transmitting terminal, ONU phase When in receiving end.

In embodiments of the present invention, OLT can be communicated to connect with multiple ONU, also, each ONU is logical within the same period Frequency range in system bandwidth used in believing is different (that is, situation 1), alternatively, OLT can be communicated to connect with an ONU, also, Any frequency range (width of the frequency range be less than system bandwidth) that can be used in system bandwidth of the ONU within a period carries out (that is, situation 2) is communicated in the following, being illustrated respectively to the movement in the case of both the above respectively.

Situation 1

In S110, OLT (an example of transmitting terminal) can be from network to network interface (NNI, Network to Network Interface it) obtains and needs to be sent to coupled multiple optical network units (ONU, Optical Network Unit) Data flow frame, and it is possible to be directed to for example, by media access control MAC (Media Access Control) module The frame decoding of above-mentioned data flow frame, framing procedure.To for example, can be according to the destination address of the MAC layer of each data flow frame, area It separates needs and is sent to the data for example, ONU#1 (an example of receiving end), thereafter, orthogonal frequency division multiplexing can be carried out to the data It is modulated with (OFDM, Orthogonal Frequency Division Multiplexing), to generate real number OFDM base band Signal (an example of target number signal).

Wherein, OFDM modulation is a kind of multi-carrier modulation technology, basic thought be in frequency domain by channel draw It is divided into many orthogonal subchannels, is modulated on each of the sub-channels using a subcarrier, four phase phases can be used in subcarrier Shift keyed signals (QPSK, Quadrature Phase Shift Keying), quadrature amplitude modulation (QAM, Quadrature Amplitude Modulation) etc. high order modulations improve power system capacity, and each subcarrier parallel transmission, this parallel biography The data flow of high speed can be assigned to several subcarrier low speed transmissions by transferring technology.OFDM is relative to general multi-carrier transmission The difference is that it allows subcarrier spectrum to partly overlap, if meet it is mutually orthogonal between subcarrier, can be from Data-signal is separated on the subcarrier of aliasing.Since OFDM allows subcarrier spectrum aliasing, spectrum efficiency is greatly improved, A kind of thus efficient modulation system.

The method and process for carrying out OFDM modulation to data are as follows, firstly, high speed binary data stream passes through serioparallel exchange Become the parallel low speed binary data b=[b in the road M₀, b₁..., b_M-1]^T, these data are using QAM mapping block progress star Seat figure mapping, each road QAM modulation order can be different, such as QPSK, QAM8, QAM16, and the road M binary data is converted into N Plural X=[the X on road₀, X₁..., X_N-1]^T, these plural numbers represent be used for transmit qam constellation point, N be ofdm system neutron The number of carrier wave.The road N signal is real by inverse fast Fourier transform (IFFT, Inverse Fast Fourier Transform) Existing OFDM modulation, the modulated multiple signals of OFDM are x=[x₀, x₁..., x_N-1]^T, in order to fight intersymbol interference (ISI, Inter-Symbol Interference) and inter-carrier interference (ICI, Inter-Carrier Interference), Ke Yi It is further added by before x a cyclic prefix (CP, Cyclic Prefix), forms x_CP, x_CP=[x_N-G..., x₀, x₁..., x_N-1 ]^T, then by a parallel-serial conversion, serial data is formed, above section is completed in numeric field.

Under normal circumstances, the output of an IFFT not instead of real number, a plural number.Output to IFFT is a reality Number, according to the property of inversefouriertransform, it is desirable that the list entries I of IFFT must satisfy Hermitian conjugate symmetry (Hermitian conjugate symmetry), that is, meet complex conjugate symmetric, and the output imaginary part of IFFT is 0 at this time, only surplus Real part.It must satisfy following relationship：

I₀, I₁..., I_N-1=X₀, X₁..., X_N/2-1, X_N/2, X^* _N/2-1..., X^* ₁

X^* _kExpression is X_kComplex conjugate (i.e. real part is identical, and imaginary part is opposite), N is the points of IFFT, and X0 corresponding is DC, It is set as 0, X_N/2Corresponding is nyquist frequency, and being also configured as 0, (edge in sample rate, is distorted in order to prevent, does not have to It).

In embodiments of the present invention, OLT can be configured with multiple (at least two) digital analog converter (DAC, Digital Analog Converter), also, the sample rate of each DAC is identical, thus, for each DAC Nyquist domain in system bandwidth In position and division mode it is identical, in other words, the quantity in the Nyquist domain of each DAC is identical, also, each Nyquist domain exists Corresponding frequency range is identical in system bandwidth.For example, as shown in Fig. 2, if the sample rate of each DAC is 1GSPS, a Nai Kuisi The width in special domain is 0.5GHz, in this case, needing 6 Nyquist domains if system bandwidth is 3GHz.

Also, the mode for the shock response curve that in embodiments of the present invention, each DAC is used is different, thus, respectively through DAC Nyquist domain at the maximum output intensity of the analog signal of processing (that is, feature Nyquist domain) is different each other, such as Shown in Fig. 2, using the first Nyquist mode, for example, non-return-to-zero mode (NRZ MODE, Non Return to Zero MODE the maximum value of the signal output intensity of the DAC (hereinafter, being denoted as DAC#1) of shock response curve) is in the first Nyquist Domain, using the second Nyquist mode, for example, the impact of rf-mode (RF MODE, Radio Frequency MODE) mode The maximum value of the signal output intensity of the DAC (hereinafter, being denoted as DAC#2) of response curve uses third in the second Nyquist domain Nyquist mode, for example, zero mode (RZ MODE, Return to Zero MODE) shock response curve DAC (with Under, be denoted as DAC#3) signal output intensity maximum value in third Nyquist domain, use the 4th Nyquist mode, example Such as, the DAC of the shock response curve of zero padding rf-mode (RFZ MODE, Zero Radio Frequency MODE) mode The maximum value of the signal output intensity of (hereinafter, being denoted as DAC#4) is in the 4th Nyquist domain.That is, in embodiments of the present invention, warp The analog signal that each DAC is handled and generated is different each other (specifically, Nyquist domain phase at maximum output intensity It is different).

It should be understood that the division mode of each mode for impacting curve shown in Fig. 2 and Nyquist domain listed above is only For exemplary illustration, the present invention is not limited to this, and the mode for impacting curve can be changed arbitrarily, also, Nyquist domain Division can be changed with the variation of sample rate and system bandwidth.

As described above, system bandwidth is divided into multiple frequency ranges, multiple ONU are used only a frequency range in a period and carry out Communication, can determine ONU#1 institute working frequency in S120, OLT.In embodiments of the present invention, OLT can be with A in the following manner Or mode B determines ONU#1 institute working frequency.

Mode A

Optionally, which determines target DAC corresponding with target frequency bands from least two DAC, including：

The transmitting terminal receives the registration request of receiving end transmission；

The transmitting terminal is according to the registration request, from least two frequency range, distributes the target frequency bands for the receiving end；

The transmitting terminal determines target DAC according to the target frequency bands from least two DAC；And

This method further includes：

The transmitting terminal sends the frequency range instruction information for being used to indicate the target frequency bands to the receiving end.

Specifically, can send registration request when ONU#1 networks to OLT, be used within the first period with request The communication resource (frequency range in system bandwidth), also, the device identification of the ONU#1 can be carried in the registration request, this sets Standby mark can uniquely indicate the ONU#1 in systems, for example, it may be sequence number (SN, the Serial of ONU#1 ) or MAC Address etc. Number.

After OLT receives the registration request, can from system bandwidth be the ONU#1 distribute one within the first period only The frequency range (an examples of target frequency bands) used for the ONU#1, it is non-limiting as example, the frequency range can be 0.6GHz~ 0.8GHz (hereinafter, being denoted as frequency range #1).

Thereafter, OLT can will indicate the equipment mark of the information and ONU#1 of frequency range #1 by, for example, broadcast message etc. Knowledge be sent to each ONU (including ONU#1), thus, ONU#1 can according to its device identification, determine can be used frequency range #1 into Row communication.It should be noted that other ONU in system are determining that corresponding with frequency range #1 device identification sets with its own When for identifying different, it can forbid being communicated within the first period using frequency range #1.

It should be understood that the method for salary distribution of target frequency bands listed above is merely illustrative, for example, first period can be with It is the entire in the net period of the ONU#1, alternatively, it is also possible to the periodic period, for example, using time-multiplexed mode, Communicate using the frequency range #1 period of ONU#1 in one cycle, when making another in same period of other ONU Section is communicated using frequency range #1.

To which OLT can be determined as the frequency range #1 (0.6GHz~0.8GHz) of ONU#1 distribution, belong to bis- Nai Kuisi Special domain (0.5GHz~1GHz), and then can determine using DAC#2 (an example of target DAC, feature corresponding to target DAC Nyquist domain is the second Nyquist domain) digital-to-analogue conversion processing is carried out to the target number signal.

The method of determining target DAC according to an embodiment of the present invention, by making ONU initiate registration flow to OLT when networking Journey, the quantity that the ONU that OLT can be made to service as needed adjusts used DAC can close more in ONU negligible amounts Remaining DAC equipment can save communications cost, realize energy conservation and environmental protection.Also, since OLT is capable of the distribution of real-time control frequency range, The variation of network element can be flexibly coped with, communication strategy is adjusted.

Mode B

The transmitting terminal obtains mapping item, which records the pass of the mapping between the receiving end and the target frequency bands System；

The transmitting terminal searches the mapping item according to the receiving end, to determine the target frequency bands；

The transmitting terminal determines target DAC according to the target frequency bands.

Specifically, for example, frequency range used in each ONU can also be allocated by network administrator or operator, OLT can obtain the mapping item for the mapping relations that record has between each ONU and each frequency range from network administrator or operator.

To which in ONU#1 networking or request communication, OLT can be according to the mapping item be searched, with the determining and ONU# 1 corresponding frequency range #1, and then determine frequency range #1 (for example, 0.6GHz~0.8GHz), belong to the second Nyquist domain (0.5GHz~1GHz), and then can determine and digital-to-analogue conversion processing is carried out to the target number signal using DAC#2.

It should be noted that in embodiments of the present invention, when OLT is that each ONU distributes communications band, a frequency can be made Section only belongs to a Nyquist domain, so as to avoid causing aliasing because a frequency range overstates two Nyquist domains, making property Energy degradation, will be unable to demodulate when serious.Further, it is possible to avoid OLT that maloperation occurs when selecting DAC, for example, if one A part of frequency range belongs to third Nyquist domain, and another part belongs to the 4th Nyquist domain, in order to avoid interference, DAC#3 It cannot be serviced with DAC#4 for other ONU, cause the waste of system resource.

So that DAC#2 (an example of target DAC) determining as described above can be used in S130, OLT, to target number Signal carries out digital-to-analogue conversion processing, which can be same as the prior art or similar, here, in order to avoid repeating, saves Slightly its detailed description.As described above, via the DAC#2 handle and generate analog signal (in other words, Nyquist signal, that is, An example of target simulation signal) maximum output intensity be located at the second Nyquist domain, that is, the target simulation signal second how The signal-to-noise ratio in Qwest domain is maximum, and signal quality is best, so as to realize the signal in high frequency (non-first Nyquist domain) Transmission.

Optionally, before the transmitting terminal sends the target simulation signal to the receiving end, this method further includes：

The transmitting terminal carries out the first filtering processing, with only retain the target simulation signal in the target frequency bands or the mesh Mark the part in the feature Nyquist domain of DAC.

Specifically, from DAC#2 export analog signal there is component in each Nyquist domain, in order to avoid other how The interference of the component in the Qwest domain component positioned at second Nyquist domain best to signal quality, can pass through filter pair Target simulation signal is filtered an example of filtering (first), with only retain the echo signal in the second Nyquist domain Part, as the mode of filtering, for example, can be filtered according to range of second Nyquist on frequency domain, that is, only retain The part between 0.5GHz~1GHz of target simulation signal.

It should be understood that the method for filtering listed above is merely illustrative, other can only retain target simulation signal The method of part in the feature Nyquist domain in target DAC fall within the protection scope of the present invention, for example, it is also possible to It is filtered according to the output intensity of target simulation signal.

In addition, in embodiments of the present invention, for example, ONU#1 working frequency #1 within the first period is communicated, therefore, (that is, being multiplexed with the signal of each ONU in system bandwidth, then progress is detailed receiving the passband signal of OLT transmission by ONU#1 Illustrate) after, the passband signal can be filtered according to frequency range #1, only to obtain the signal within the scope of frequency range #1, be made For target simulation signal.Therefore, above-mentioned first filtering can also only retain the part in frequency range #1 of the echo signal, example Such as, can be filtered according to range of the frequency range #1 on frequency domain, that is, only retain target simulation signal in 0.6GHz~ Part between 0.8GHz.

The transmitting terminal carries out the second filtering processing, in the feature Nyquist domain of the target frequency bands or target DAC Only retain the target simulation signal.

Specifically, OLT is needed to other ONU in addition to ONU#1 within the first period, for example, ONU#2 is sent When signal, with ONU#2, working frequency #2 is communicated within the first period, and frequency range #2 belongs to third Nyquist domain, and (DAC#3 is most Nyquist domain at big output intensity) for, the analog signal for handling and generating through DAC#3 (is hereinafter referred to as interfered and is believed Number) in each Nyquist domain there is component, in order to avoid the interference signal the component positioned at the second Nyquist domain to mesh Mark analog signal interferes, and can be filtered (an example of the second filtering) by filter to interference signal, dry to delete The component positioned at the second Nyquist domain of signal is disturbed, in other words, only retains echo signal in the second Nyquist domain, as filter The mode of wave filters for example, can be multiplexed by interference signal and echo signal to before system bandwidth using with above-mentioned first Identical method, is filtered interference signal, so as to remove interference signal be located at the second Nyquist domain or frequency Component in section #1.

It should be understood that in embodiments of the present invention, the second filtering processing can carry out simultaneously with the second filtering processing, that is, When carrying out the above-mentioned first filtering processing to interference signal, it is equivalent to and has carried out above-mentioned second filtering processing.

Needs can be sent to the analog signal (including target simulation signal) of each ONU in the first period in S140, OLT Multiplexing forms ofdm signal in whole system bandwidth.Also, OLT can carry out electro-optic conversion processing, shape to the ofdm signal At optical signal.To which, OLT can be via Optical Distribution Network (ODN, Optical Distribution Network) by optical signal It broadcasts to each ONU.

Situation 2

It is with the main distinction of above situation 1, OLT and ONU#1 carry out point to point link, that is, ONU#1, which can be used, is Any frequency range in regiment commander's width is communicated, in this case, determining that the mode of target frequency bands and target DAC and situation 1 exist Difference is below mainly illustrated above-mentioned distinctive points, in the case where not specified, the movement of other steps and method with Situation 1 is similar.

Optionally, the receiving end can any frequency range at least two frequency range communicated, and

The transmitting terminal determines target DAC corresponding with target frequency bands from least two DAC, including：

The transmitting terminal is using any DAC at least two DAC as target DAC；

The transmitting terminal determines the target frequency bands from feature Nyquist domain corresponding to target DAC；And

This method further includes：

Specifically, communicated since ONU#1 is able to use any frequency range in system bandwidth, OLT can be selected Any DAC is selected as target DAC, for example, can choose DAC#2, may thereby determine that the frequency of target simulation signal generated Section belongs to the second Nyquist domain, thus, for example, can be according to the size etc. of digital signal, target frequency bands required for determining Width, and from the second Nyquist domain determine frequency range #1 as target frequency bands, and it is possible to which the target frequency bands will be indicated It indicates information, is sent to ONU#1.

To which ONU#1 can indicate information according to the frequency range, determine the signaling bearer of OLT transmission in frequency range #1.

In addition, interference signal is not present since OLT and ONU#1 carries out point to point link, it is above-mentioned without carrying out Second filtering processing.

OLT completes the transmission of the downlink data for ONU#1 as a result,.In the following, with ONU#1's (an example of receiving end) For reception movement, the reception processing of receiving end is illustrated.

As it appears from the above, can know before ONU#1 receives optical signal and need received Deta bearer in frequency range #1 (an examples of target frequency bands).

To which ONU#1 can carry out photoelectric conversion processing, shape to the optical signal after the optical signal for receiving OLT transmission At analog signal (electric signal), for example, (the point when the electric signal is the ofdm signal comprising the signal being carried in multiple frequency ranges In the case where multicast communication), ONU#1 can be according to its target frequency bands, that is, frequency range #1, only selection is located at from ofdm signal The signal of frequency range #1, that is, OLT needs to be sent to the target simulation signal of ONU#1.

Alternatively, ONU#1 receive OLT transmission full bandwidth optical signal after, can be according to its target frequency bands, that is, frequency Section #1, the optical signal of the full bandwidth is filtered, so as to obtain the target optical signal being only carried on frequency range #1 (with Target simulation signal is corresponding), and it is possible to photoelectric conversion processing be carried out to the target optical signal, to obtain target simulation letter Number.

As described above, frequency range #1 is in the second Nyquist domain, therefore the target simulation signal is non-baseband signal.

In embodiments of the present invention, two kinds of methods handled the non-baseband signal can be provided.

Method i

The target simulation signal of the high frequency, in analog domain, can be downconverted to base for example, by i/q demodulator by ONU#1 Then band carries out the analog-to-digital conversion sampling of low speed.

At that time, this method needed the i/q demodulator using high speed, and the i/q demodulator of current high speed is difficult to obtain, cost compared with Height, further, since the same phase of i/q demodulator and orthogonal two branch are inconsistent, the gain difference of frequency mixer leads to amplitude imbalance, The phase difference of two local oscillation signals, which is not stringent 90 °, leads to unbalance in phase, and there are the unbalanced problem of I/Q two-way, meetings Cause the variation of baseband I/Q signal, generate I/Q imbalance problem, eventually leads to performance deterioration.

Method ii

When the feature Nyquist domain corresponding to the target DAC is not the first Nyquist domain, this method further includes：

The transmitting terminal sends Nyquist domain to the receiving end and indicates that information, Nyquist domain instruction information are used to indicate Nyquist domain at the target frequency bands.

Specifically, can know that analog signal (in other words, generates the maximum output of the DAC of the analog signal in ONU#1 Intensity) at Nyquist domain generate the mode for the shock response curve that the DAC of the analog signal is used in other words In the case of, ONU#1 can recover the component of the analog signal in base band (the first Nyquist domain), that is, of the invention real Apply in example, ONU#1 can use lack sampling (also referred to as bandpass sampling or Intermediate Frequency Sampling), by analog-digital converter (ADC, Analog Digital Converter) carry out analog-to-digital conversion process.Fig. 3 is to indicate that the frequency spectrum shift of Undersampling technique acts on Schematic diagram, as shown in figure 3, for the analog signal of 72.5 megahertzs of (MHz) ± 2MHz, if sampled using baseband sampling Rate need to be up to 145,000,000 sampling/second (MSPS, Million Samples Per Second) or more, but if using owing to adopt Sample technology makes its sampling rate 10MSPS, so that it may significantly reduce sampling rate.Also, for the defeated of Bandwidth-Constrained Enter signal, all there is two components (NFs+fa, NFs-fa, N=0,1,2......) at each harmonic of sample frequency.No By input signal how, it is total in Nyquist Bandwidth under the premise of guaranteeing spectrum overlapping not to occur after sampling processing The frequency spectrum of the input signal of meeting existence anduniquess or the component (specifically, being image frequency components) of input signal, all band wraps for they All information containing input signal.Therefore, in order to which the overlapping (Overlap) of frequency spectrum does not occur in analog-to-digital conversion, ADC is adopted Sample rate Fs, signal highest frequency FH, it is necessary to meet following condition by signal low-limit frequency FL：

2FH/K≤Fs≤2FL/[k-1]

2≤K≤2FH/ [FH-FL], FH≤2FL

Nyquist domain at the maximum output intensity of analog signal is known in ONU#1, in other words, generates the simulation After the mode for the shock response curve that the DAC of signal is used, by recovering the signal in base band (the first Nyquist domain) Component can recover target number signal with lower sampling rate.Without carrying out down coversion in analog domain.

Therefore, in embodiments of the present invention, OLT can notify ONU#1 is sent to indicate the frequency after target DAC has been determined Nyquist domain at section #1 (an example of Nyquist domain instruction information), alternatively, ONU#1 target DAC can be notified The mode (an example of Nyquist domain instruction information) of used shock response curve, alternatively, ONU#1 can be notified to be generated Target simulation signal maximum output intensity at the Nyquist domain an example again of information (Nyquist domain instruction).

It should be noted that in the case where OLT carries out the above-mentioned first filtering processing to target simulation signal, due to through being somebody's turn to do Analog signal after first filtering processing only exists in the feature Nyquist domain of target DAC, therefore, Nyquist domain instruction Information can also indicate that Nyquist domain at the target simulation signal.

The method of transmission data according to an embodiment of the present invention, by making receiving end according to the maximum output institute of analog signal The Nyquist domain being in recovers the component of the analog signal and samples to the component, in a base band to obtain number Signal can substantially reduce the sampling rate of the analog-to-digital conversion process of receiving end, further decrease communication equipment and network construction Cost.

After obtaining digital signal as described above, ONU#1 can carry out OFDM demodulation to the digital signal, for example, can be with It is y that digital signal, which is carried out serioparallel exchange,_CP=[y_N-G..., y₀, y₁..., y_N-1]^T, reject CP after be y=[y₀, y₁..., y_N-1 ]^T, OFDM demodulation is completed by Fast Fourier Transform (FFT) (FFT, Fast Fourier Transform), every height is recovered and carries Wave modulation signal Y=[Y₀, Y₁..., Y_N-1]^T, the relevant treatments such as equilibrium are carried out later, are demodulated and are restored using corresponding QAM Data b=[the b sent out₀, b₁..., b_M-1]^T.The data frame transmitted finally by originator is restored after a parallel-serial conversion.And lead to It crosses and is handled such as MAC module carries out frame decoding, framing, finally by user to network interface (UNI, User to Network Interface), the data are given to terminal user.

Fig. 4 is the schematic interaction figure of the method for transmission data according to an embodiment of the invention.As shown in figure 4, S210, OLT can according to the quantity (quantity of the mode for the shock response curve in other words, being able to use) of the DAC configured, System bandwidth is divided into multiple frequency ranges (of same size or different) to be formed since the sampling rate that each DAC is used is identical Distribution of each Nyquist domain in system bandwidth it is identical, so that in embodiments of the present invention, OLT can make each frequency range only Belong to a Nyquist domain.It should be noted that a Nyquist domain may include a frequency range, it can also multiple frequencies Section, the present invention are simultaneously not particularly limited.

In S215, OLT can be for example, by base-band resource, the periodically broadcast SN request (to each ONU).

Registration request is sent after receiving SN request, to OLT in S220, ONU#1, also, in the registration request Carry the SN of ONU#1.

After S225, OLT receive the registration request, it can be distributed from each frequency range divided as described above for ONU#1 One target frequency bands (for example, above-mentioned frequency range #1), and by frequency range instruction message, notice ONU#1 is carried out using the target frequency bands It communicates, also, carries the SN of ONU#1 in the frequency range instruction message.

Determine that the SN carried in the frequency range instruction message is consistent with the SN of its own in S230, ONU#1, so that it is determined that using Target frequency bands are communicated.

A confirmation message is returned to OLT in S235, ONU#1, to notify OLT logical by target frequency bands and ONU#1 Letter.

Downlink training sequence is sent to ONU#1 by the target frequency bands in S240, OLT；

The signal-to-noise ratio of each subcarrier of downlink is calculated in S245, ONU#1, and then determines the order of modulation of each subcarrier of downlink.

In S250, ONU#1 OLT will be sent to for the calculated result of downlink and uplink training sequence.

The signal-to-noise ratio of each subcarrier of uplink is calculated in S255, OLT, and then determines the order of modulation of each subcarrier of uplink.

In S260, OLT will be sent to ONU#1 for the calculated result of uplink, and confirms and be arranged successfully.

It is arranged successfully in S265, ONU#1 to OLT confirmation.

In S270, subsequent registration process is completed, for example, ONU ID is distributed, ranging etc..

In S275, carried out data transmission using above-mentioned target frequency bands.

It should be understood that the embodiment that the method for transmission signal of the invention is suitable for PON is enumerated above, but the present invention is simultaneously It is not limited to this, also can be applied to various communication systems, for example, global system for mobile communications (GSM, Global System Of Mobile communication), CDMA (CDMA, Code Division Multiple Access) system is wide Band CDMA (WCDMA, Wideband Code Division Multiple Access Wireless), general packet without Line service (GPRS, General Packet Radio Service), long term evolution (LTE, Long Term Evolution) Deng.

Also, it needs to be transmitted by optical signal in PON, but the present invention is not limited to this, transmitting terminal generates target After analog signal, receiving end can also be directly sent it to.

The method of transmission signal according to an embodiment of the present invention is made by configuring multiple DAC in transmitting terminal through at each DAC The maximum output intensity of analog signal after reason is located at different Nyquist domains, and is each receiving end distribution in system bandwidth Different frequency ranges, transmitting terminal is when sending data to receiving end, according to Frequency Band Selection target DAC corresponding with the receiving end, So that target frequency bands belong to Qwest domain at the maximum output intensity of target DAC, and to target DAC to needing to send out The data for giving the receiving end are handled, and to generate target simulation signal, and then are sent to the receiving end, thus receiving end energy Enough according to its corresponding frequency range, target simulation signal is identified from system bandwidth, therefore, the sample rate of each DAC is not necessarily to and system Bandwidth is corresponding, so as to reduce the requirement to DAC sample rate, and then reduces the cost of communication equipment and network construction.

Fig. 5 is the schematic flow chart of the method 300 of transmission data according to an embodiment of the invention.This method 300 by The receiving end for the target number signal at least one receiving end that communication system includes executes, which further includes sending End, the transmitting terminal have at least two digital-to-analogue conversion DAC, the sample rate which uses is identical, and this at least two The feature Nyquist domain of DAC is different each other, wherein the feature Nyquist domain of a DAC is the processing through the DAC and generates Analog signal maximum output intensity at Nyquist domain, the system bandwidth which uses is divided at least Two frequency ranges, the frequency range only belongs to the feature Nyquist domain of a DAC, and the frequency range is only used in a period The communication of one receiving end, as shown in figure 5, this method 300 includes：

S310, the receiving end determine target frequency bands, which is that the transmitting terminal and the receiving end carry out communication use Frequency range；

S320, the receiving end obtain the target simulation signal of transmitting terminal transmission according to the target frequency bands；

S330, the receiving end receive the Nyquist domain instruction information of transmitting terminal transmission, Nyquist domain instruction letter Breath is used to indicate Nyquist domain at the target frequency bands；

S340, the receiving end indicate information according to the Nyquist domain, determine the target simulation signal in mono- Nai Kuisi Respective components in special domain；

S350, respective components of the receiving end according to the target simulation signal in the first Nyquist domain, to the target Analog signal carries out analog-to-digital conversion process.

Technical solution of the present invention, can be applied to it is various need that transmitting terminal is made to convert digital signals into analog signal, And by the way of wireless communication or optic communication, which is sent to the communication system of receiving end, such as：In PON In, a piece trunk optical fiber of PON local side can be divided into tens of even more multi-channel optical fibre connection users, substantially reduce networking cost. PON technology mainly has EPON and GPON etc. several at present, and main difference is to use two layers of different technologies.It is existing EPON and GPON product can be using different technologies schemes such as OFDM-PON.OFDM-PON technology can not only introduce transmitting terminal and For receiving end Electric signal processing to eliminate various damages, may be incorporated into high order modulation reduces the bandwidth requirement of various photoelectric devices, Furthermore the technology also has many advantages, such as the multiple access access of high efficient and flexible and resource allocation methods, therefore has obtained industry and widely closed Note.

In pon, OLT can be communicated to connect with one or more ONU, also, the system that PON can be used in an ONU A part of frequency range (in other words, subcarrier) in bandwidth (in other words, system carrier) is communicated, in the downlink transfer mistake of PON Cheng Zhong, OLT need that the data of each ONU will be sent to, then multi-carrier modulation is broadcasted to whole system bandwidth to each ONU.

Hereinafter, in order to facilitate understanding and explanation, by the embodiment of the present invention transmission signal method 300 be suitable for PON When process (specifically, being downlink transmission process) for, be illustrated, in this case, OLT is equivalent to transmitting terminal, ONU phase When in receiving end.

In embodiments of the present invention, OLT can be communicated to connect with multiple ONU, also, each ONU is logical within the same period Frequency range in system bandwidth used in believing is different (that is, situation 3), alternatively, OLT can be communicated to connect with an ONU, also, Any frequency range (width of the frequency range be less than system bandwidth) that can be used in system bandwidth of the ONU within a period carries out (that is, situation 4) is communicated in the following, being illustrated respectively to the movement in the case of both the above respectively.

Situation 3

OLT (an example of transmitting terminal) can obtain the data flow frame for needing to be sent to coupled multiple ONU from NNI, And it is possible to carry out the frame decoding for above-mentioned data flow frame, framing procedure for example, by MAC module.To for example, can root According to the destination address of the MAC layer of each data flow frame, distinguishes needs and is sent to the data for example, ONU#1 (an example of receiving end), Thereafter, OFDM modulation can be carried out to the data, to generate real number OFDM baseband signal (an example of target number signal).

In embodiments of the present invention, OLT can be configured with multiple (at least two) DAC, also, the sample rate phase of each DAC Together, thus, it is identical for position and division mode of the Nyquist domain in system bandwidth of each DAC, specifically, each DAC Nyquist domain quantity it is identical, also, each Nyquist domain corresponding frequency range in system bandwidth is identical.For example, such as Fig. 2 Shown, if the sample rate of each DAC is 1GSPS, the width in a Nyquist domain is 0.5GHz, in this case, if being Regiment commander's width is 3GHz, then needs 6 Nyquist domains.

Also, the mode for the shock response curve that in embodiments of the present invention, each DAC is used is different, thus, respectively through DAC Nyquist domain at the maximum output intensity of the analog signal of processing (that is, feature Nyquist domain) is different each other, such as Shown in Fig. 2, using NRZ MODE, the DAC of the shock response curve of Non Return to Zero MODE is (hereinafter, be denoted as DAC# 1) maximum value of signal output intensity in the first Nyquist domain, using the shock response curve of RF MODE DAC (hereinafter, Be denoted as DAC#2) signal output intensity maximum value in the second Nyquist domain, use the shock response curve of RZ MODE The maximum value of the signal output intensity of DAC (hereinafter, being denoted as DAC#3) uses the impact of RFZ MODE in third Nyquist domain The maximum value of the signal output intensity of the DAC (hereinafter, being denoted as DAC#4) of response curve is in the 4th Nyquist domain.That is, in this hair In bright embodiment, the analog signal for handling and generating through each DAC is different each other (specifically, at maximum output intensity Nyquist domain is different).

As described above, system bandwidth is divided into multiple frequency ranges, multiple ONU are used only a frequency range in a period and carry out Communication, OLT can determine ONU#1 institute working frequency.In embodiments of the present invention, ONU#1 can by C in the following manner or in a manner of D determines ONU#1 institute working frequency.

Mode A

Optionally, which determines target frequency bands, including：

The receiving end receives the frequency range instruction information for being used to indicate the target frequency bands of transmitting terminal transmission, the target frequency bands It is that the transmitting terminal is distributed from least two frequency range for the receiving end；

The receiving end indicates information according to the frequency range, determines the target frequency bands.

Also, the receiving end receive the transmitting terminal transmission be used to indicate the target frequency bands frequency range instruction information it Before, this method further includes：

The receiving end to the transmitting terminal send registration request, in order to the transmitting terminal according to the registration request from this at least two The target frequency bands are distributed for the receiving end in a frequency range, and send frequency range instruction information.

Specifically, can send and register to OLT (an example of transmitting terminal) when ONU#1 (an example of receiving end) networks Request, to request the communication resource (frequency range in system bandwidth) used within the first period, also, can in the registration request To carry the device identification of the ONU#1, which can uniquely indicate the ONU#1 in systems, for example, it may be The sequence number (SN, Serial Number) of ONU#1 or MAC Address etc..

It should be understood that the method for salary distribution of target frequency bands listed above is merely illustrative, for example, first period can be with It is the entire in the net period of the ONU#1, alternatively, it is also possible to the periodic period, for example, using time-multiplexed mode, It communicates using the frequency range #1 period (the first period) of ONU#1 in one cycle, makes other ONU in same period Another period use the frequency range #1 communication.

To which OLT can be determined as the frequency range #1 (0.6GHz~0.8GHz) of ONU#1 distribution, belong to bis- Nai Kuisi Special domain (0.5GHz~1GHz), and then can determine and the target number signal is counted using DAC#2 (an example of target DAC) Mould conversion process.

Mode B

Optionally, which determines target frequency bands, including：

The receiving end obtains mapping item, and mapping item record has the mapping between the receiving end and the target frequency bands to close System；

The mapping item is searched in the receiving end, to determine the target frequency bands

Specifically, for example, frequency range used in each ONU can also be allocated by network administrator or operator, ONU#1 can obtain the mapping table for the mapping relations that record has between each ONU and each frequency range from network administrator or operator ?.

To, when ONU#1 networks or requests communication, the mapping item can be searched, it is corresponding with the ONU#1 with determination Frequency range #1.

Similarly, OLT is also available and searches the mapping item, to determine frequency range #1 corresponding with the ONU#1, in turn It determines frequency range #1 (for example, 0.6GHz~0.8GHz), belongs to the second Nyquist domain (0.5GHz~1GHz), and then can be true Surely digital-to-analogue conversion processing is carried out to the target number signal using DAC#2.

To which DAC#2 (an example of target DAC) determining as described above can be used in OLT, carries out to target number signal Digital-to-analogue conversion processing, which can be same as the prior art or similar, here, in order to avoid repeating, omits it in detail Explanation.As described above, analog signal (in other words, the Nyquist signal, that is, target simulation for handling and generating via the DAC#2 An example of signal) maximum output intensity be located at the second Nyquist domain, that is, the target simulation signal is in the second Nyquist domain Signal-to-noise ratio it is maximum, signal quality is best, so as to realize the signal transmission in high frequency (non-first Nyquist domain).

It should be noted that there is component in each Nyquist domain from the analog signal that DAC#2 is exported, in order to avoid it The interference of the component in his the Nyquist domain component positioned at second Nyquist domain best to signal quality, can pass through filtering Device is filtered (an example of the first filtering) to target simulation signal, with only retain the echo signal in the second Nyquist The part in domain, as the mode of filtering, for example, can be filtered according to range of second Nyquist on frequency domain, that is, only Retain the part between 0.5GHz~1GHz of target simulation signal.

In addition, OLT is needed to other ONU in addition to ONU#1 within the first period, for example, ONU#2 sends signal When, with ONU#2, working frequency #2 is communicated within the first period, and frequency range #2 belongs to third Nyquist domain, and (maximum of DAC#3 is defeated Nyquist domain at intensity out) for, through DAC#3 handle and generate analog signal (hereinafter referred to as interference signal) There is component in each Nyquist domain, in order to avoid the interference signal the component positioned at the second Nyquist domain to target mould Quasi- signal interferes, and (an example of the second filtering) can be filtered to interference signal by filter, to delete interference letter Number the component positioned at the second Nyquist domain only retain echo signal in the second Nyquist domain, as filtering in other words Mode, for example, can be multiplexed by interference signal and echo signal to before system bandwidth, using identical as above-mentioned first filtering Method, interference signal is filtered, so as to remove interference signal be located at the second Nyquist domain or frequency range #1 In component.

Thereafter, OLT can be multiple by the analog signal (including target simulation signal) for needing to be sent to each ONU in the first period With in whole system bandwidth, ofdm signal is formed.Also, OLT can carry out electro-optic conversion processing to the ofdm signal, be formed Optical signal.To which OLT can be wide by optical signal via Optical Distribution Network (ODN, Optical Distribution Network) Cast to each ONU.

Situation 4

It is with the main distinction of above situation 3, OLT and ONU#1 carry out point to point link, that is, ONU#1, which can be used, is Any frequency range in regiment commander's width is communicated, in this case, determining that the mode of target frequency bands and target DAC and situation 3 exist Difference is below mainly illustrated above-mentioned distinctive points, in the case where not specified, the movement of other steps and method with Situation 3 is similar.

Optionally, which determines target frequency bands, including：

As it appears from the above, can know in S310, ONU#1 and received data is needed to hold before ONU#1 receives optical signal It is loaded in frequency range #1 (an examples of target frequency bands).

Photoelectric conversion processing can be carried out to the optical signal in S320, ONU#1, be formed analog signal (electric signal), for example, When the electric signal is the ofdm signal comprising the signal being carried in multiple frequency ranges (in the case where point-to-multipoint transmission), ONU# 1 can be according to its target frequency bands, that is, frequency range #1, only selection is located at the signal of frequency range #1 from ofdm signal, that is, OLT needs to send out Give the target simulation signal of ONU#1.

In S330, ONU#1 can carry out analog-to-digital conversion process to the target simulation signal, to restore the number from network side According to frame.

Information is indicated in the Nyquist domain that S340, ONU#1 can receive OLT transmission, thus, ONU#1 can know mesh Mark Nyquist domain at frequency (in other words, generating the maximum output intensity of the DAC of the analog signal), in turn, ONU#1 The component of the analog signal can be recovered in base band (the first Nyquist domain), that is, in embodiments of the present invention, ONU#1 Lack sampling (also referred to as bandpass sampling or Intermediate Frequency Sampling) can be used, pass through analog-digital converter (ADC, Analog Digital Converter) carry out analog-to-digital conversion process.Fig. 3 is the schematic diagram for indicating the frequency spectrum shift effect of Undersampling technique, As shown in figure 3, for the analog signal of 72.5MHz ± 2MHz, if sampling rate need to be up to using baseband sampling 145MSPS or more, but if making its sampling rate 10MSPS, so that it may significantly reduce sampling rate using Undersampling technique. Also, for the input signal of a Bandwidth-Constrained, all exist at each harmonic of sample frequency two components (NFs+fa, NFs-fa, N=0,1,2......).No matter input signal, guaranteeing that spectrum overlapping does not occur after sampling processing Under the premise of, the frequency spectrum of the input signal of federation's existence anduniquess or the component of input signal be (specifically in Nyquist Bandwidth Say, be image frequency components), their all information of band comprising input signal.Therefore, in order to frequency spectrum does not occur in analog-to-digital conversion Overlapping (Overlap), need to meet following item to the sample rate Fs, signal highest frequency FH, signal low-limit frequency FL of ADC Part：

2FH/K≤Fs≤2FL/[k-1]

2≤K≤2FH/ [FH-FL], FH≤2FL

Therefore, in embodiments of the present invention, OLT can also notify the ONU#1 target frequency after target DAC has been determined Present Nyquist domain (an example of Nyquist domain instruction information), or, shock response curve used in target DAC The mode another example of information (Nyquist domain instruction), or, at the maximum output intensity of the target simulation signal how Qwest domain (an example again of Nyquist domain instruction information).

In S350, after obtaining digital signal as described above, ONU#1 can carry out OFDM demodulation to the digital signal, extensive The data frame that originator of appearing again transmits.And the processing such as frame decoding, framing is carried out for example, by MAC module, finally by UNI, by the number According to giving terminal user.

It is arranged successfully in S265, ONU#1 to OLT confirmation.

More than, in conjunction with the method that transmission signal according to an embodiment of the present invention is described in detail in Fig. 1 to Fig. 5, in the following, in conjunction with The device of transmission signal according to an embodiment of the present invention is described in detail in Fig. 6 to Fig. 7.

Fig. 6 shows the schematic block diagram of the device 400 of transmission signal according to an embodiment of the present invention.The device 400 packet It includes：

At least two digital analog converter DAC, respectively feature Nyquist domain corresponding to the DAC is different, wherein how is this feature Qwest domain be the processing through corresponding DAC and the maximum output intensity of analog signal that generates at Nyquist Domain, the sample rate which uses is identical, and the system bandwidth which uses is divided at least two frequency ranges, One frequency range belongs to feature Nyquist domain corresponding to a DAC；

Acquiring unit 410 needs to be sent to the target number signal of receiving end for obtaining；

Determination unit 420, for determining target DAC corresponding with target frequency bands from least two DAC, wherein The target frequency bands are that the device carries out communicating the frequency range used with the receiving end, which belongs to corresponding to target DAC Feature Nyquist domain；

Generation unit 430, for being handled by target DAC the target number signal, to generate target simulation Signal；

Transmit-Receive Unit 440, for sending the target simulation signal to the receiving end by the target frequency bands.

Optionally, when the feature Nyquist domain corresponding to the target DAC is not the first Nyquist domain, the transmitting-receiving list Member 440 is also used to send instruction information in Nyquist domain to the receiving end, and Nyquist domain instruction information is used to indicate the mesh Mark Nyquist domain at frequency range.

Optionally, which is also used to receive the registration request of receiving end transmission；

The determination unit 420 is also used to according to the registration request, should for receiving end distribution from least two frequency range Target frequency bands, and according to the target frequency bands, target DAC is determined from least two DAC；

The Transmit-Receive Unit 440 is also used to send the frequency range for being used to indicate the target frequency bands to the receiving end and indicates information, with Information is indicated according to the frequency range convenient for the receiving end, determines the target frequency bands.

Optionally, which is also used to obtain mapping item, and mapping item record has each receiving end and each frequency Mapping relations between section；

The determination unit 420 is specifically used for searching the mapping item according to the receiving end, to determine the target frequency bands, and According to the target frequency bands, target DAC is determined.

The determination unit 420 is specifically used for using any DAC at least two DAC as target DAC, and from the mesh In the feature Nyquist domain for marking DAC, the target frequency bands are determined；

Optionally, which is also used to carry out the first filtering processing, only to retain the place of the target simulation signal The part in the feature Nyquist domain corresponding to the target frequency bands or target DAC.

Optionally, which is also used to carry out the second filtering processing, in the target frequency bands or target DAC Only retain the target simulation signal in corresponding feature Nyquist domain

The device 400 of transmission signal according to an embodiment of the present invention can correspond to the transmission in the method for the embodiment of the present invention It holds (for example, OLT), also, each unit, that is, module in the device 400 and other above-mentioned operation and/or functions are respectively for reality The corresponding process of method 100 in existing Fig. 1, for sake of simplicity, details are not described herein.

The device of transmission signal according to an embodiment of the present invention is made by configuring multiple DAC in transmitting terminal through at each DAC The maximum output intensity of analog signal after reason is located at different Nyquist domains, and is each receiving end distribution in system bandwidth Different frequency ranges, transmitting terminal is when sending data to receiving end, according to Frequency Band Selection target DAC corresponding with the receiving end, So that target frequency bands belong to Qwest domain at the maximum output intensity of target DAC, and to target DAC to needing to send out The data for giving the receiving end are handled, and to generate target simulation signal, and then are sent to the receiving end, thus receiving end energy Enough according to its corresponding frequency range, target simulation signal is identified from system bandwidth, therefore, the sample rate of each DAC is not necessarily to and system Bandwidth is corresponding, so as to reduce the requirement to DAC sample rate, and then reduces the cost of communication equipment and network construction.

Fig. 7 shows the schematic block diagram of the device 500 of transmission signal according to an embodiment of the present invention.The device 500 packet It includes：

Determination unit 510, for determining target frequency bands, which is that transmitting terminal communicate using with the device Frequency range；

Transmit-Receive Unit 520 for according to the target frequency bands, obtaining the target simulation signal of transmitting terminal transmission, and receives The Nyquist domain that the transmitting terminal is sent indicates that information, Nyquist domain instruction information are used to indicate at the target frequency bands Nyquist domain；

Processing unit 530, for according to the Nyquist domain indicate information, determine the target simulation signal first how Kui Respective components in this special domain, and the respective components according to the target simulation signal in the first Nyquist domain, to the target Analog signal carries out analog-to-digital conversion process, to obtain the target number signal.

Optionally, which is also used to receive the frequency range for being used to indicate the target frequency bands of transmitting terminal transmission Indicate that information, the target frequency bands are that the transmitting terminal is distributed from least two frequency range for the receiving end；

The determination unit 510 is specifically used for indicating information according to the frequency range, determines the target frequency bands.

Optionally, which, which is also used to receive to the transmitting terminal, sends registration request, in order to the transmitting terminal root The target frequency bands are distributed for the receiving end from least two frequency range according to the registration request, and send frequency range instruction information.

Optionally, which is also used to receive acquisition mapping item, the mapping item record have each receiving end with Mapping relations between each frequency range；

The determination unit 510 is specifically used for searching the mapping item, to determine the target frequency bands.

The device 500 of transmission signal according to an embodiment of the present invention can correspond to the reception in the method for the embodiment of the present invention Hold (for example, ONU#1), also, each unit, that is, module in the device 500 and other above-mentioned operation and/or functions respectively in order to The corresponding process for realizing the method 300 in Fig. 5, for sake of simplicity, details are not described herein.

Also, it is extensive in a base band by making receiving end Nyquist domain according at the maximum output of analog signal The component for the analog signal of appearing again simultaneously samples the component, to obtain digital signal, can substantially reduce the mould of receiving end The sampling rate of number conversion process, further decreases the cost of communication equipment and network construction.

More than, in conjunction with the method that transmission signal according to an embodiment of the present invention is described in detail in Fig. 1 to Fig. 5, in the following, in conjunction with The device of transmission signal according to an embodiment of the present invention is described in detail in Fig. 8 to Fig. 9.

Fig. 8 shows the schematic block diagram of the equipment 600 of transmission signal according to an embodiment of the present invention.The equipment 600 tool There are at least two digital analog converter DAC, respectively feature Nyquist domain corresponding to the DAC is different, wherein this feature Nyquist Domain be the processing through corresponding DAC and the maximum output intensity of analog signal that generates at Nyquist domain, this is extremely The sample rate that few two DAC are used is identical, and the system bandwidth which uses is divided at least two frequency ranges, the frequency Section belongs to feature Nyquist domain corresponding to a DAC, as shown in figure 8, the equipment 600 includes：

Bus 610；

The processor 620 being connected with the bus 610；

The memory 630 being connected with the bus 610；

The transceiver 640 being connected with the bus 610

Wherein, the processor 620 calls the program stored in the memory 630 by the bus 610, with Need to be sent to the target number signal of receiving end in acquisition；

For determining target DAC corresponding with target frequency bands from least two DAC, wherein the target frequency bands are The transmitting terminal carries out communicating the frequency range used with the receiving end, the target frequency bands belong to feature corresponding to target DAC how Kui This special domain；

For being handled by target DAC the target number signal, to generate target simulation signal；

For controlling transceiver 640 by the target frequency bands, the target simulation signal is sent to the receiving end.

Optionally, when the feature Nyquist domain of target DAC is non-first Nyquist domain, the processor 620 is also Nyquist domain instruction information is sent to the receiving end for controlling the transceiver 640, Nyquist domain instruction information is used for Indicate Nyquist domain at the target frequency bands.

Optionally, which is also used to control the transceiver 640 and receives the registration request that the receiving end is sent；

For according to the registration request, from least two frequency range, the target frequency bands are distributed for the receiving end, and according to The target frequency bands determine target DAC from least two DAC；

Information is indicated to the frequency range that receiving end transmission is used to indicate the target frequency bands for controlling the transceiver 640, with Information is indicated according to the frequency range convenient for the receiving end, determines the target frequency bands.

Optionally, which is also used to control the transceiver 640 and obtains mapping item, and mapping item record has Mapping relations between each receiving end and each frequency range；

For searching the mapping item according to the receiving end, to determine the target frequency bands, and according to the target frequency bands, really Fixed target DAC.

Optionally, the receiving end can any frequency range at least two frequency range communicated and the processor 620 Specifically for using any DAC at least two DAC as target DAC, and from the feature Nyquist domain of target DAC In, determine the target frequency bands；

Optionally, which is also used to carry out the first filtering processing, only to retain being in for the target simulation signal The part in feature Nyquist domain corresponding to the target frequency bands or target DAC.

Optionally, which is also used to carry out the second filtering processing, in the target frequency bands or target DAC institute Only retain the target simulation signal in corresponding feature Nyquist domain.

In specific application, processor 620 may be implemented or execute disclosed each step in embodiment of the present invention method Rapid and logic diagram.General processor 620 can be microprocessor or the processor is also possible to any conventional processor, Decoder etc..The step of method in conjunction with disclosed in the embodiment of the present invention, can be embodied directly in hardware processor and execute completion, Or in decoding processor hardware and software module combination execute completion.Software module can be located at random access memory, dodge It deposits, read-only memory, this fields such as programmable read only memory or electrically erasable programmable memory, register are mature to deposit In storage media.The storage medium is located at memory 630, and processor 620 reads the information in memory 630, complete in conjunction with its hardware The step of at the above method.

It should be understood that in embodiments of the present invention, which can be central processing unit (Central Processing Unit, referred to as " CPU "), which can also be other general processors, digital signal processor (DSP), specific integrated circuit (ASIC), ready-made programmable gate array (FPGA) or other programmable logic device, discrete gate Or transistor logic, discrete hardware components etc..General processor can be microprocessor or the processor can also be with It is any conventional processor etc..

The memory 630 may include read-only memory and random access memory, and to processor 820 provide instruction and Data.The a part of of memory 630 can also include nonvolatile RAM.For example, memory 630 can also be deposited Store up the information of device type.

The bus 610 can also include power bus, control bus and status signal bus in addition in addition to including data/address bus Deng.But for the sake of clear explanation, various buses are all designated as bus 610 in figure.

During realization, each step of the above method can pass through the integrated logic circuit of the hardware in processor 620 Or the instruction of software form is completed.The step of method in conjunction with disclosed in the embodiment of the present invention, can be embodied directly at hardware Reason device executes completion, or in processor hardware and software module combine and execute completion.Software module can be located at random Memory, flash memory, read-only memory, the abilities such as programmable read only memory or electrically erasable programmable memory, register In the storage medium of domain maturation.The storage medium is located at memory 630, and processor 620 reads the information in memory 630, knot Close the step of its hardware completes the above method.To avoid repeating, it is not detailed herein.

The equipment 600 of transmission signal according to an embodiment of the present invention can correspond to the transmission in the method for the embodiment of the present invention It holds (for example, OLT), also, each unit, that is, module in the equipment 600 and other above-mentioned operation and/or functions are respectively for reality The corresponding process of method 100 in existing Fig. 1, for sake of simplicity, details are not described herein.

The equipment of transmission signal according to an embodiment of the present invention is made by configuring multiple DAC in transmitting terminal through at each DAC The maximum output intensity of analog signal after reason is located at different Nyquist domains, and is each receiving end distribution in system bandwidth Different frequency ranges, transmitting terminal is when sending data to receiving end, according to Frequency Band Selection target DAC corresponding with the receiving end, So that target frequency bands belong to Qwest domain at the maximum output intensity of target DAC, and to target DAC to needing to send out The data for giving the receiving end are handled, and to generate target simulation signal, and then are sent to the receiving end, thus receiving end energy Enough according to its corresponding frequency range, target simulation signal is identified from system bandwidth, therefore, the sample rate of each DAC is not necessarily to and system Bandwidth is corresponding, so as to reduce the requirement to DAC sample rate, and then reduces the cost of communication equipment and network construction.

Fig. 9 shows the schematic block diagram of the equipment 700 of transmission signal according to an embodiment of the present invention.The equipment 700 packet It includes：

As shown in Figure 10, which includes：

Bus 710；

The processor 720 being connected with the bus 710；

The memory 730 being connected with the bus 710；

The transceiver 740 being connected with the bus 710

Wherein, the processor 720 calls the program stored in the memory 730 by the bus 710, with In determining target frequency bands, which is that the transmitting terminal carries out communicating the frequency range used with the receiving end；

For controlling transceiver 740 and obtaining the target simulation signal that the transmitting terminal is sent according to the target frequency bands；

The Nyquist domain instruction information that the transmitting terminal is sent is received for controlling transceiver 740, which refers to Show that information is used to indicate Nyquist domain at the target frequency bands；

For indicating information according to the Nyquist domain, pair of the target simulation signal in the first Nyquist domain is determined Answer component；

For the respective components according to the target simulation signal in the first Nyquist domain, to the target simulation signal into Row analog-to-digital conversion process.

Optionally, the processor 720 be also used to control the transceiver 740 receive the transmitting terminal send be used to indicate the mesh The frequency range for marking frequency range indicates that information, the target frequency bands are that the transmitting terminal is distributed from least two frequency range for the receiving end；

For indicating information according to the frequency range, the target frequency bands are determined.

Optionally, which is also used to control the transceiver 740 and sends registration request to the transmitting terminal, in order to The transmitting terminal distributes the target frequency bands from least two frequency range according to the registration request for the receiving end, and sends the frequency range Indicate information.

Optionally, which is also used to control the transceiver 740 and receives acquisition mapping item, mapping item note Record has the mapping relations between each receiving end and each frequency range；

For searching the mapping item, to determine the target frequency bands.

In specific application, processor 720 may be implemented or execute disclosed each step in embodiment of the present invention method Rapid and logic diagram.General processor 720 can be microprocessor or the processor is also possible to any conventional processor, Decoder etc..The step of method in conjunction with disclosed in the embodiment of the present invention, can be embodied directly in hardware processor and execute completion, Or in decoding processor hardware and software module combination execute completion.Software module can be located at random access memory, dodge It deposits, read-only memory, this fields such as programmable read only memory or electrically erasable programmable memory, register are mature to deposit In storage media.The storage medium is located at memory 730, and processor 720 reads the information in memory 730, complete in conjunction with its hardware The step of at the above method.

The memory 730 may include read-only memory and random access memory, and to processor 820 provide instruction and Data.The a part of of memory 730 can also include nonvolatile RAM.For example, memory 730 can also be deposited Store up the information of device type.

The bus 710 can also include power bus, control bus and status signal bus in addition in addition to including data/address bus Deng.But for the sake of clear explanation, various buses are all designated as bus 710 in figure.

During realization, each step of the above method can pass through the integrated logic circuit of the hardware in processor 720 Or the instruction of software form is completed.The step of method in conjunction with disclosed in the embodiment of the present invention, can be embodied directly at hardware Reason device executes completion, or in processor hardware and software module combine and execute completion.Software module can be located at random Memory, flash memory, read-only memory, the abilities such as programmable read only memory or electrically erasable programmable memory, register In the storage medium of domain maturation.The storage medium is located at memory 730, and processor 720 reads the information in memory 730, knot Close the step of its hardware completes the above method.To avoid repeating, it is not detailed herein.

The equipment 700 of transmission signal according to an embodiment of the present invention can correspond to the reception in the method for the embodiment of the present invention Hold (for example, ONU#1), also, each unit, that is, module in the equipment 700 and other above-mentioned operation and/or functions respectively in order to The corresponding process for realizing the method 300 in Fig. 5, for sake of simplicity, details are not described herein.

Figure 10 shows the schematic block diagram of the system 800 of transmission signal according to an embodiment of the present invention, as shown in Figure 10, The system 800 includes transmitting terminal 810 and receiving end 820, which has at least two digital analog converter DAC, respectively should Feature Nyquist domain corresponding to DAC is different, wherein this feature Nyquist domain is the processing through corresponding DAC and gives birth to At analog signal maximum output intensity at Nyquist domain, the sample rate which uses is identical, should The system bandwidth that communication system uses is divided at least two frequency ranges, and how the frequency range belongs to feature corresponding to a DAC Qwest domain,

The transmitting terminal 810 is for obtaining the target number signal for needing to be sent to receiving end, from least two DAC really Fixed target DAC corresponding with target frequency bands, wherein the target frequency bands are that the transmitting terminal communicate using with the receiving end Frequency range, which belongs to feature Nyquist domain corresponding to target DAC, by target DAC to the target number Signal is handled, and to generate target simulation signal, by the target frequency bands, sends the target simulation signal to the receiving end；

Receiving end 820 obtains the mesh of the transmitting terminal 810 transmission for determining the target frequency bands, and according to the target frequency bands Analog signal is marked, analog-to-digital conversion process is carried out to the target simulation signal, to obtain the target number signal.

Optionally, when the feature Nyquist domain of target DAC is non-first Nyquist domain, the transmitting terminal 810 is also Indicate that information, Nyquist domain instruction information are used to indicate the target frequency bands institute for sending Nyquist domain to the receiving end The Nyquist domain being in；

The receiving end 820 is also used to receive the Nyquist domain instruction information of transmitting terminal transmission, which refers to Show that information is used to indicate Nyquist domain at the target frequency bands, information is indicated according to the Nyquist domain, determines the mesh Mark respective components of the analog signal in the first Nyquist domain；The receiving end is according to the target simulation signal in mono- Nai Kuisi Respective components in special domain carry out analog-to-digital conversion process to the target simulation signal.

Transmitting terminal 810 according to an embodiment of the present invention can correspond in the method for the embodiment of the present invention transmitting terminal (for example, OLT), also, each unit, that is, module in the transmitting terminal 810 and other above-mentioned operation and/or functions are respectively in order to realize in Fig. 1 Method 100 corresponding process, for sake of simplicity, details are not described herein.

Receiving end 820 according to an embodiment of the present invention can correspond to the receiving end in the method for the embodiment of the present invention (for example, ONU#1), also, each unit, that is, module in the receiving end 820 and other above-mentioned operation and/or functions are respectively in order to realize Fig. 5 In method 300 corresponding process, for sake of simplicity, details are not described herein.

The system of transmission signal according to an embodiment of the present invention is made by configuring multiple DAC in transmitting terminal through at each DAC The maximum output intensity of analog signal after reason is located at different Nyquist domains, and is each receiving end distribution in system bandwidth Different frequency ranges, transmitting terminal is when sending data to receiving end, according to Frequency Band Selection target DAC corresponding with the receiving end, So that target frequency bands belong to Qwest domain at the maximum output intensity of target DAC, and to target DAC to needing to send out The data for giving the receiving end are handled, and to generate target simulation signal, and then are sent to the receiving end, thus receiving end energy Enough according to its corresponding frequency range, target simulation signal is identified from system bandwidth, therefore, the sample rate of each DAC is not necessarily to and system Bandwidth is corresponding, so as to reduce the requirement to DAC sample rate, and then reduces the cost of communication equipment and network construction.

It should be understood that the terms "and/or", only a kind of incidence relation for describing affiliated partner, expression can deposit In three kinds of relationships, for example, A and/or B, can indicate：Individualism A exists simultaneously A and B, these three situations of individualism B. In addition, character "/" herein, typicallys represent the relationship that forward-backward correlation object is a kind of "or".

It should be understood that in various embodiments of the present invention, magnitude of the sequence numbers of the above procedures are not meant to execute suitable Sequence it is successive, the execution of each process sequence should be determined by its function and internal logic, the implementation without coping with the embodiment of the present invention Process constitutes any restriction.

Those of ordinary skill in the art may be aware that list described in conjunction with the examples disclosed in the embodiments of the present disclosure Member and algorithm steps can be realized with the combination of electronic hardware or computer software and electronic hardware.These functions are actually It is implemented in hardware or software, the specific application and design constraint depending on technical solution.Professional technician Each specific application can be used different methods to achieve the described function, but this realization is it is not considered that exceed The scope of the present invention.

It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description, The specific work process of device and unit, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.

In several embodiments provided herein, it should be understood that disclosed systems, devices and methods, it can be with It realizes by another way.For example, the apparatus embodiments described above are merely exemplary, for example, the unit It divides, only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple units or components It can be combined or can be integrated into another system, or some features can be ignored or not executed.Another point, it is shown or The mutual coupling, direct-coupling or communication connection discussed can be through some interfaces, the indirect coupling of device or unit It closes or communicates to connect, can be electrical property, mechanical or other forms.

The unit as illustrated by the separation member may or may not be physically separated, aobvious as unit The component shown may or may not be physical unit, it can and it is in one place, or may be distributed over multiple In network unit.It can select some or all of unit therein according to the actual needs to realize the mesh of this embodiment scheme 's.

It, can also be in addition, the functional units in various embodiments of the present invention may be integrated into one processing unit It is that each unit physically exists alone, can also be integrated in one unit with two or more units.

It, can be with if the function is realized in the form of SFU software functional unit and when sold or used as an independent product It is stored in a computer readable storage medium.Based on this understanding, technical solution of the present invention is substantially in other words The part of the part that contributes to existing technology or the technical solution can be embodied in the form of software products, the meter Calculation machine software product is stored in a storage medium, including some instructions are used so that a computer equipment (can be a People's computer, server or network equipment etc.) it performs all or part of the steps of the method described in the various embodiments of the present invention. And storage medium above-mentioned includes：USB flash disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), arbitrary access are deposited The various media that can store program code such as reservoir (RAM, Random Access Memory), magnetic or disk.

The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain Lid is within protection scope of the present invention.Therefore, protection scope of the present invention should be based on the protection scope of the described claims.

Claims

1. a kind of method for transmitting signal, which is characterized in that executed by the transmitting terminal in communication system, the transmitting terminal has extremely Feature Nyquist domain corresponding to few two digital analog converters DAC, each DAC is different, wherein the feature Nyquist Domain be the processing through corresponding DAC and the maximum output intensity of analog signal that generates at Nyquist domain, it is described The sample rate that at least two DAC are used is identical, and the system bandwidth that the communication system uses is divided at least two frequency ranges, and one The frequency range belongs to feature Nyquist domain corresponding to a DAC, the method includes：

The transmitting terminal obtains the target number signal for needing to be sent to receiving end；

The transmitting terminal determines target DAC corresponding with target frequency bands from least two DAC, wherein the target Frequency range is that the transmitting terminal carries out communicating the frequency range used with the receiving end, and the target frequency bands belong to the target DAC institute Corresponding feature Nyquist domain；

The transmitting terminal is handled the target number signal by the target DAC, to generate target simulation signal；

The transmitting terminal sends the target simulation signal by the target frequency bands, to the receiving end.

2. the method according to claim 1, wherein working as feature Nyquist domain corresponding to the target DAC When not being the first Nyquist domain, the method also includes：

The transmitting terminal sends Nyquist domain to the receiving end and indicates information, and the Nyquist domain instruction information is for referring to Show Nyquist domain at the target frequency bands, wherein first Nyquist domain includes non-return-to-zero mode NRZ Nyquist domain at the maximum value of the DAC signal output intensity of the shock response curve of MODE.

3. method according to claim 1 or 2, which is characterized in that the transmitting terminal is determined from least two DAC Target DAC corresponding with target frequency bands, including：

The transmitting terminal receives the registration request that the receiving end is sent；

The transmitting terminal is according to the registration request, from least two frequency range, distributes the target for the receiving end Frequency range；

The method also includes：

4. method according to claim 1 or 2, which is characterized in that the transmitting terminal is determined from least two DAC Target DAC corresponding with target frequency bands, including：

The transmitting terminal obtains mapping item, and the mapping item records the mapping between the receiving end and the target frequency bands Relationship；

The transmitting terminal searches the mapping item according to the receiving end, with the determination target frequency bands；

The transmitting terminal determines the target DAC according to the target frequency bands.

5. method according to claim 1 or 2, which is characterized in that the receiving end can be at least two frequency range Any frequency range communicated, and

The transmitting terminal is using any DAC at least two DAC as the target DAC；

The transmitting terminal determines the target frequency bands from feature Nyquist domain corresponding to the target DAC；And

The method also includes：

6. according to the method described in claim 5, it is characterized in that, in the transmitting terminal by the target frequency bands, to described Before receiving end sends the target simulation signal, the method also includes：

The transmitting terminal carries out the first filtering processing, with retain the target simulation signal corresponding to the target DAC Feature Nyquist domain or the target frequency bands part.

7. according to the method described in claim 6, it is characterized in that, in the transmitting terminal by the target frequency bands, to described Before receiving end sends the target simulation signal, the method also includes：

The transmitting terminal carries out the second filtering processing, with the feature Nyquist domain corresponding to the target DAC or the mesh Retain the target simulation signal in mark frequency range.

8. a kind of method for transmitting signal, which is characterized in that the method includes：

Receiving end determines that target frequency bands, the target frequency bands are that transmitting terminal carries out communicating the frequency range used with the receiving end；

The receiving end obtains the target simulation signal that the transmitting terminal is sent according to the target frequency bands；

The receiving end receives the Nyquist domain instruction information that the transmitting terminal is sent, and the Nyquist domain instruction information is used The Nyquist domain at the instruction target frequency bands；

The receiving end indicates information according to the Nyquist domain, determines the target simulation signal in the first Nyquist domain In respective components；

Respective components of the receiving end according to the target simulation signal in the first Nyquist domain, to the target simulation Signal carries out analog-to-digital conversion process, wherein first Nyquist domain includes the shock response of non-return-to-zero mode NRZ MODE Nyquist domain at the maximum value of the DAC signal output intensity of curve.

9. according to the method described in claim 8, it is characterized in that, the receiving end determines target frequency bands, including：

The receiving end receives the frequency range instruction information for being used to indicate the target frequency bands that the transmitting terminal is sent, the target Frequency range is that the transmitting terminal is the receiving end distribution from least two frequency range；

10. according to the method described in claim 9, it is characterized in that, receiving the use that the transmitting terminal is sent in the receiving end Before indicating the frequency range instruction information of the target frequency bands, the method also includes：

The receiving end sends registration request to the transmitting terminal, in order to the transmitting terminal according to the registration request from described It is that the target frequency bands are distributed in the receiving end, and send the frequency range instruction information at least two frequency ranges.

11. according to the method described in claim 8, it is characterized in that, the receiving end determines target frequency bands, including：

The receiving end obtains mapping item, and the mapping item record has reflecting between the receiving end and the target frequency bands Penetrate relationship；

The mapping item is searched in the receiving end, with the determination target frequency bands.

12. a kind of device for transmitting signal, which is characterized in that described device includes：

Feature Nyquist domain corresponding at least two digital analog converter DAC, each DAC is different, wherein how is the feature Qwest domain be the processing through corresponding DAC and the maximum output intensity of analog signal that generates at Nyquist Domain, the sample rate that at least two DAC is used is identical, and the system bandwidth that communication system uses is divided at least two frequency ranges, One frequency range belongs to feature Nyquist domain corresponding to a DAC；

Acquiring unit needs to be sent to the target number signal of receiving end for obtaining；

Determination unit, for determining target DAC corresponding with target frequency bands from least two DAC, wherein the mesh Marking frequency range is that described device carries out communicating the frequency range used with the receiving end, and the target frequency bands belong to the target DAC institute Corresponding feature Nyquist domain；

Generation unit, for being handled by the target DAC the target number signal, to generate target simulation letter Number；

Transmit-Receive Unit, for sending the target simulation signal to the receiving end by the target frequency bands.

13. device according to claim 12, which is characterized in that the feature Nyquist corresponding to the target DAC When domain is not the first Nyquist domain, the Transmit-Receive Unit is also used to send instruction information in Nyquist domain to the receiving end, Nyquist domain instruction information is used to indicate Nyquist domain at the target frequency bands, wherein described first how Qwest domain includes at the maximum value of the DAC signal output intensity of the shock response curve of non-return-to-zero mode NRZMODE Nyquist domain.

14. device according to claim 12 or 13, which is characterized in that the Transmit-Receive Unit is also used to receive the reception Hold the registration request sent；

The determination unit is also used to according to the registration request, from least two frequency range, is distributed for the receiving end The target frequency bands, and according to the target frequency bands, target DAC is determined from least two DAC；

The Transmit-Receive Unit is also used to send the frequency range for being used to indicate the target frequency bands to the receiving end and indicates information.

15. device according to claim 12 or 13, which is characterized in that the acquiring unit is also used to obtain mapping table , the mapping item record has the mapping relations between each receiving end and each frequency range；

The determination unit is specifically used for searching the mapping item according to the receiving end, with the determination target frequency bands, and According to the target frequency bands, the target DAC is determined.

16. device according to claim 12 or 13, which is characterized in that the receiving end being capable of at least two frequency range In any frequency range communicated, and

The determination unit is specifically used for using any DAC at least two DAC as the target DAC, and from described In feature Nyquist domain corresponding to target DAC, the target frequency bands are determined；

17. device according to claim 16, which is characterized in that the generation unit is also used to carry out at the first filtering Reason, only to retain the feature Nai Kuisi corresponding to the target frequency bands or the target DAC of the target simulation signal The part in special domain.

18. device according to claim 17, which is characterized in that the generation unit is also used to carry out at the second filtering Reason, only to retain the target simulation letter in the feature Nyquist domain corresponding to the target frequency bands or the target DAC Number.

19. a kind of device for transmitting signal, which is characterized in that described device includes：

Determination unit, for determining that target frequency bands, the target frequency bands are that transmitting terminal carries out communicating the frequency used with described device Section；

Transmit-Receive Unit, for obtaining the target simulation signal that the transmitting terminal is sent according to the target frequency bands, and described in reception The Nyquist domain that transmitting terminal is sent indicates that information, the Nyquist domain instruction information are used to indicate locating for the target frequency bands In Nyquist domain；

Processing unit determines the target simulation signal in mono- Nai Kuisi for indicating information according to the Nyquist domain Respective components in special domain, and the respective components according to the target simulation signal in the first Nyquist domain, to the mesh It marks analog signal and carries out analog-to-digital conversion process, to obtain the target number signal, wherein first Nyquist domain includes Nyquist domain at the maximum value of the DAC signal output intensity of the shock response curve of non-return-to-zero mode NRZ MODE.

20. device according to claim 19, which is characterized in that the Transmit-Receive Unit is also used to receive the transmitting terminal hair The frequency range instruction information for being used to indicate the target frequency bands sent, the target frequency bands are the transmitting terminals from least two frequency ranges In be what the receiving end was distributed；

The determination unit is specifically used for indicating information according to the frequency range, determines the target frequency bands.

21. device according to claim 20, which is characterized in that the Transmit-Receive Unit is also used to send to the transmitting terminal Registration request, in order to which the transmitting terminal is the receiving end distribution from least two frequency range according to the registration request The target frequency bands, and send the frequency range instruction information.

22. device according to claim 19, which is characterized in that the determination unit is also used to obtain mapping item, institute It states mapping item and records the mapping relations having between the receiving end and the target frequency bands；

For searching the mapping item, with the determination target frequency bands.

23. a kind of system for transmitting signal, which is characterized in that the system comprises：

Device described in any one of 2 to 18 according to claim 1；Or

Device described in any one of 2 to 18 and according to claim 1 dress described in any one of 9 to 22 according to claim 1 It sets.