CN105191244B - A kind of modulator approach of adaptive-bandwidth, device and system - Google Patents

A kind of modulator approach of adaptive-bandwidth, device and system Download PDF

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Publication number
CN105191244B
CN105191244B CN201480003670.7A CN201480003670A CN105191244B CN 105191244 B CN105191244 B CN 105191244B CN 201480003670 A CN201480003670 A CN 201480003670A CN 105191244 B CN105191244 B CN 105191244B
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modulation
subband
snr
signal
qam
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CN105191244A (en
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周恩波
左天健
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Huawei Technologies Co Ltd
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Huawei Technologies Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/18—Phase-modulated carrier systems, i.e. using phase-shift keying
    • H04L27/20—Modulator circuits; Transmitter circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/25—Arrangements specific to fibre transmission
    • H04B10/2507—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion
    • H04B10/2513—Arrangements specific to fibre transmission for the reduction or elimination of distortion or dispersion due to chromatic dispersion
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation
    • H04B10/548—Phase or frequency modulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26

Abstract

The invention discloses a kind of modulator approach of adaptive-bandwidth, device and system, it is related to the communications field, reduces number of sub-bands, reduce the complexity of system, and can avoids in optical fiber transmission because of power fading caused by dispersion.A kind of modulator approach of adaptive-bandwidth, comprising: transmitting terminal has same band B predetermined quantity0Minimum subband on carry out first time signal modulation；To the signal of receiving end transmitting first time signal modulation；Receive the bandwidth of the flexible subband of receiving end feedback and the modulation format of higher order modulation formats；Transmitting terminal carries out second of signal modulation according to the bandwidth of flexible subband and the modulation format of higher order modulation formats；Emit the signal of second of signal modulation to the receiving end.Present invention is mainly used for signal modulations.

Description

A kind of modulator approach of adaptive-bandwidth, device and system
Technical field
The present invention relates to the communications field more particularly to a kind of modulator approaches of adaptive-bandwidth, device and system.
Background technique
Multiband no-load wave amplitude phase modulation technique (multiband Carrierless Amplitude/Phase Modulation, multi-band CAP) it is orthogonal amplitude adjustment (Quadrature Amplitude Modulation, QAM) Mutation, realized by bandpass filter carrierfree modulation system on numeric field, the multiband CAP's based on multi-subband Spectrum efficiency can be improved in modulator approach.The principle of multiband CAP scheme is in transmitting terminal original input signal signal The subband for splitting into several different frequency bands carries out CAP modulation respectively, then is merged and then carry out Electro-optical Modulation.
When optical signal transmits in standard single-mode fiber, every certain frequency interval, there is power caused by a dispersion It declines point (fading point), limits the capacity of CAP, under different dispersions and transmission range, the position to decline a little is different Sample, existing system are difficult to avoid decline point.Simultaneously because subband is more, the complexity of resources requirement and system realization is also with son Increase with quantity and increase.
Summary of the invention
The embodiment of the present invention provides a kind of modulator approach of adaptive-bandwidth, device and system, reduces number of sub-bands, reduces The complexity of system, and can avoid in optical fiber transmission because of power fading caused by dispersion.
In order to achieve the above objectives, the embodiment of the present invention adopts the following technical scheme that
In a first aspect, providing a kind of modulator approach of adaptive-bandwidth, comprising:
Transmitting terminal has same band B predetermined quantity0Minimum subband on carry out first time signal modulation；Described Signal modulation uses each minimum subband the modulation format of identical low-order-modulated format；
Emit the signal of the first time signal modulation to receiving end；
Receive the bandwidth of the flexible subband of the receiving end feedback and the modulation format of higher order modulation formats；Wherein, if The SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nPositioned at the default section SNR, the receiving end will It is n*B that minimum subband k, k+1 ... k+n, which merges into bandwidth,0Flexible subband, and use is suitable for the default area SNR Between the modulation formats of higher order modulation formats fill the flexible subband, the transmission rate of the higher order modulation formats is higher than described Low-order-modulated format；
Transmitting terminal carries out second and believes according to the bandwidth of the flexible subband and the modulation format of the higher order modulation formats Number modulation；
Emit the signal of second of signal modulation to the receiving end.
With reference to first aspect, in the first possible implementation of the first aspect, emitting institute to the receiving end After the signal for stating second of signal modulation, further includes:
Receive the subband power of the update of the receiving end feedback；
Transmitting terminal carries out third time signal modulation according to the power of the subband of the update；
The signal of the third time signal modulation is sent to the receiving end.
With reference to first aspect or the first possible implementation of first aspect, second in first aspect are possible In implementation, the receiving end prestores the minimum threshold error rate BER of at least modulation format known to three kindsiIt is corresponding SNRmin i, wherein SNRmin i< SNRmin i+1；The known modulation format includes: binary phase shift keying BPSK, four phase phase shift keys It controls QPSK, 8- orthogonal amplitude and adjusts QAM, 16-QAM, 32-QAM and 2m- QAM, m >=6；
The default section SNR is [SNRmin i, SNRmin i+1)。
With reference to first aspect or the first or second of possible implementation of first aspect, in the third of first aspect In the possible implementation of kind, the low-order-modulated format includes the BPSK and QPSK；
When the low-order-modulated format is BPSK, the higher order modulation formats include QPSK, 8-QAM, 16-QAM, 32- QAM and/or 2m- QAM, m >=6；
When the low-order-modulated format be QPSK when, the higher order modulation formats include 8-QAM, 16-QAM, 32-QAM and/ Or 2m- QAM, m >=6.
With reference to first aspect or the first possible implementation of first aspect, the 4th kind in first aspect are possible In implementation, there is same band B in predetermined quantity in transmitting terminal0Minimum subband on carry out first time signal modulation Before, further includes:
The bandwidth B of the minimum subband is set according to the limitation of the bandwidth of communication system and system resource0。
With reference to first aspect or the first possible implementation of first aspect, the 5th kind in first aspect are possible In implementation, when detecting the power fading after optical fiber link switching, or the transmission rate of optical fiber telecommunications system is detected When lower than rate-valve value, the transmitting terminal has same band B the predetermined quantity0Minimum subband on carry out for the first time Signal modulation.
The possible implementation of with reference to first aspect the first, in the 6th kind of possible implementation of first aspect In, after the signal for sending the third time signal modulation to the receiving end, further includes:
Receive the subband power of the receiving end feedback updated again；
According to the subband power updated again, signal modulation is carried out again；
The signal of signal modulation again is sent to the receiving end.
Second aspect provides a kind of modulator approach of adaptive-bandwidth, comprising:
Receiving end receives the signal for the first time signal modulation that transmitting terminal is sent；Wherein, the transmitting terminal is in predetermined quantity Have same band B0Minimum subband on carry out first time signal modulation；The first time signal modulation to it is each it is described most Small subband uses the modulation format of identical low-order-modulated format；
Obtain the Signal to Noise Ratio (SNR) of each minimum subband；
If the SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nPositioned at the default section SNR, It is n*B that minimum subband k, k+1 ... k+n, which is merged into bandwidth,0Flexible subband, and use is suitable for the default SNR The modulation format of the higher order modulation formats in section fills the flexible subband；Wherein the transmission rate of the higher order modulation formats is high In the low-order-modulated format；
The bandwidth of the flexible subband and the modulation format of the higher order modulation formats are fed back to the transmitting terminal；
Receive the signal for second of signal modulation that the transmitting terminal is sent.
In conjunction with second aspect, in second aspect in the first possible implementation, each minimum subband is being obtained Signal to Noise Ratio (SNR) after, further includes:
If the SNR of minimum subband jjLower than preset minimum SNR thresholding, the minimum subband j is abandoned.
In conjunction with the first possible implementation of second aspect, in second of possible implementation of second aspect In, after the signal for receiving second of signal modulation that the transmitting terminal is sent, further includes:
Subband power is updated according to the SNR of each subband of the signal of second of signal modulation；
The subband power of update is fed back into transmitting terminal；
Receive the signal for the third time signal modulation that the transmitting terminal is sent.
In conjunction with the first or second of possible implementation of second aspect or second aspect, in the third of second aspect In the possible implementation of kind, the receiving end prestores the minimum threshold error rate BER of at least modulation format known to three kindsiIt is right The SNR answeredmin i, wherein SNRmin i< SNRmin i+1；The known modulation format includes: binary phase shift keying BPSK, four phase shifts Phase keying QPSK, 8- orthogonal amplitude adjusts QAM, 16-QAM, 32-QAM and 2m- QAM, m >=6；
The minimum SNR thresholding is SNRmin 1；
The default section SNR is [SNRmin i, SNRmin i+1)。
In conjunction with the third possible implementation of second aspect, in the 4th kind of possible implementation of second aspect In, the low-order-modulated format includes BPSK and QPSK；
When the low-order-modulated format is BPSK, the higher order modulation formats include QPSK, 8QAM, 16QAM, 32QAM And/or 2m- QAM, m >=6；
When the low-order-modulated format be QPSK when, the higher order modulation formats include 8QAM, 16QAM, 32QAM and/or 2m- QAM, m >=6.
In conjunction with second of possible implementation of second aspect, in the 5th kind of possible implementation of second aspect In, after the signal for receiving the third time signal modulation that the transmitting terminal is sent, further includes:
Subband power is updated again according to the SNR of each subband；
The subband power updated again is fed back into the transmitting terminal.
The third aspect provides a kind of modulating device of adaptive-bandwidth, comprising:
Modulation unit, for there is same band B in predetermined quantity0Minimum subband on carry out first time signal tune System；The first time signal modulation uses each minimum subband the modulation format of identical low-order-modulated format；
Transmitting unit, for emitting the signal of the modulation unit first time signal modulation to receiving end；
Receiving unit, for receiving the bandwidth of the flexible subband of the receiving end feedback and the modulation code of higher order modulation formats Type；Wherein, if the SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nPositioned at the default section SNR, It is n*B that minimum subband k, k+1 ... k+n is merged into bandwidth by the receiving end0Flexible subband, and use is suitable for institute The modulation format for stating the higher order modulation formats in the default section SNR fills the flexible subband, the transmission of the higher order modulation formats Rate is higher than the low-order-modulated format；
The modulation unit is also used to bandwidth and the high-order according to the received flexible subband of the receiving unit The modulation format of modulation format carries out second of signal modulation；
The transmitting unit is also used to emit to the receiving end signal of second of signal modulation of the modulation unit.
In conjunction with the third aspect, in the first possible implementation of the third aspect, the receiving unit is also used to connect Receive the subband power of the update of the receiving end feedback；
The modulation unit is also used to the power of the subband according to the received update of the receiving unit, carries out third Secondary signal modulation；
The transmitting unit is also used to send the signal of the modulation unit third time signal modulation to the receiving end.
In conjunction with the third aspect or the third aspect the first possible implementation, in second of possible reality of the third aspect In existing mode, the receiving end prestores the minimum threshold error rate BER of at least modulation format known to three kindsiCorresponding SNRmin i, Wherein SNRmin i< SNRmin i+1；The known modulation format include: binary phase shift keying BPSK, quaternary PSK QPSK, 8- orthogonal amplitude adjusts QAM, 16-QAM, 32-QAM and 2m- QAM, m >=6；
The default section SNR is [SNRmin i, SNRmin i+1)。
In conjunction with second of possible implementation of the third aspect, in the third possible implementation of the third aspect In, the low-order-modulated format includes the BPSK and QPSK；
When the low-order-modulated format is BPSK, the higher order modulation formats include QPSK, 8-QAM, 16-QAM, 32- QAM and/or 2m- QAM, m >=6；
When the low-order-modulated format be QPSK when, the higher order modulation formats include 8-QAM, 16-QAM, 32-QAM and/ Or 2m- QAM, m >=6.
In conjunction with the possible implementation of the first of the third aspect or the third aspect, the 4th kind in the third aspect is possible In implementation, further includes: bandwidth setup unit, for there is same band B in predetermined quantity in the modulation unit0's Before carrying out first time signal modulation on minimum subband, the most boy is set according to the limitation of the bandwidth of communication system and system resource The bandwidth B of band0。
In conjunction with the possible implementation of the first of the third aspect or the third aspect, the 5th kind in the third aspect is possible In implementation, the modulation unit is specifically used for when detecting the power fading after optical fiber link switching, or detects light When the transmission rate of fiber communication system is lower than rate-valve value, there is same band B in the predetermined quantity0Minimum subband on Carry out first time signal modulation.
In conjunction with the first possible implementation of the third aspect, in the 6th kind of possible implementation of the third aspect In, the receiving unit is also used to after the signal for sending the third time signal modulation to the receiving end, is connect described in reception The subband power of receiving end feedback updated again；
The modulation unit is also used to according to the received subband power updated again of the receiving unit, again into Row signal modulation；
The transmitting unit is also used to send the signal that the modulation unit is modulated again to the receiving end.
Fourth aspect provides a kind of modulating device of adaptive-bandwidth, comprising:
Receiving unit, the signal of the first time signal modulation for receiving transmitting terminal transmission；Wherein, the transmitting terminal is pre- Fixed number amount has same band B0Minimum subband on carry out first time signal modulation；The first time signal modulation is to each The minimum subband uses the modulation format of identical low-order-modulated format；
Signal-to-noise ratio acquiring unit, for obtaining the Signal to Noise Ratio (SNR) of each minimum subband；
Sub-band processing unit, for working as the SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nPosition In the default section SNR, it is n*B that minimum subband k, k+1 ... k+n, which is merged into bandwidth,0Flexible subband, and using be suitble to The flexible subband is filled in the modulation format of the higher order modulation formats in the default section SNR；The wherein high order modulation lattice The transmission rate of formula is higher than the low-order-modulated format；
Transmitting unit, for feeding back the bandwidth of the flexible subband and the tune of the higher order modulation formats to the transmitting terminal Pattern processed；
The receiving unit is also used to receive the signal for second of signal modulation that the transmitting terminal is sent.
In conjunction with fourth aspect, in the first possible implementation of the fourth aspect, the sub-band processing unit is also used After the Signal to Noise Ratio (SNR) in each minimum subband of acquisition, if the SNR of minimum subband jjIt is SNR minimum lower than preset Limit abandons the minimum subband j.
In conjunction with the first possible implementation of fourth aspect, in second of possible implementation of fourth aspect In, further includes:
Power updating unit, the SNR for each subband according to the signal of second of signal modulation update subband Power；
The subband power that the transmitting unit is also used to update the power updating unit feeds back transmitting terminal；
The receiving unit is also used to receive the signal for the third time signal modulation that the transmitting terminal is sent.
In conjunction with the first or second of possible implementation of fourth aspect or fourth aspect, in the third of fourth aspect In the possible implementation of kind, the receiving end prestores the minimum threshold error rate BER of at least modulation format known to three kindsiIt is right The SNR answeredmin i, wherein SNRmin i< SNRmin i+1；The known modulation format includes: binary phase shift keying BPSK, four phase shifts Phase keying QPSK, 8- orthogonal amplitude adjusts QAM, 16-QAM, 32-QAM and 2m- QAM, m >=6；
The minimum SNR thresholding is SNRmin 1；
The default section SNR is [SNRmin i, SNRmin i+1)。
In conjunction with the third possible implementation of fourth aspect, in the 4th kind of possible implementation of fourth aspect In, the low-order-modulated format includes BPSK and QPSK；
When the low-order-modulated format is BPSK, the higher order modulation formats include QPSK, 8QAM, 16QAM, 32QAM And/or 2m- QAM, m >=6；
When the low-order-modulated format be QPSK when, the higher order modulation formats include 8QAM, 16QAM, 32QAM and/or 2m- QAM, m >=6.
In conjunction with second of possible implementation of fourth aspect, in the 5th kind of possible implementation of fourth aspect In, the power updating unit is also used to after the signal for receiving the third time signal modulation that the transmitting terminal is sent, according to every The SNR of a subband updates subband power again；
The subband power that the transmitting unit is also used to again update the power updating unit feeds back the transmitting terminal.
5th aspect, provides a kind of modulating device of adaptive-bandwidth, comprising:
Processor, for there is same band B in predetermined quantity0Minimum subband on carry out first time signal modulation； The first time signal modulation uses each minimum subband the modulation format of identical low-order-modulated format；
Transmitter, for emitting the signal of the processor first time signal modulation to receiving end；
Receiver, for receiving the bandwidth of the flexible subband of the receiving end feedback and the modulation code of higher order modulation formats Type；Wherein, if the SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nPositioned at the default section SNR, It is n*B that minimum subband k, k+1 ... k+n is merged into bandwidth by the receiving end0Flexible subband, and use is suitable for institute The modulation format for stating the higher order modulation formats in the default section SNR fills the flexible subband, the transmission of the higher order modulation formats Rate is higher than the low-order-modulated format；
The processor is also used to bandwidth and the high order modulation according to the received flexible subband of the receiver The modulation format of format carries out second of signal modulation；
The transmitter is also used to emit to the receiving end signal of second of signal modulation of the processor.
In conjunction with the 5th aspect, in the first possible implementation of the 5th aspect, the receiver is also used to receive The subband power of the update of the receiving end feedback；
The processor is also used to the power of the subband according to the received update of the receiver, carries out third time letter Number modulation；
The transmitter is also used to send the signal of the processor third time signal modulation to the receiving end.
In conjunction with the 5th aspect or the 5th aspect the first possible implementation, the 5th aspect second of possible reality In existing mode, the receiving end prestores the minimum threshold error rate BER of at least modulation format known to three kindsiCorresponding SNRmin i, Wherein SNRmin i< SNRmin i+1；The known modulation format include: binary phase shift keying BPSK, quaternary PSK QPSK, 8- orthogonal amplitude adjusts QAM, 16-QAM, 32-QAM and 2m- QAM, m >=6；
The default section SNR is [SNRmin i, SNRmin i+1)。
In conjunction with second of possible implementation of the 5th aspect, in the third possible implementation of the 5th aspect In, the low-order-modulated format includes the BPSK and QPSK；
When the low-order-modulated format is BPSK, the higher order modulation formats include QPSK, 8-QAM, 16-QAM, 32- QAM and/or 2m- QAM, m >=6；
When the low-order-modulated format be QPSK when, the higher order modulation formats include 8-QAM, 16-QAM, 32-QAM and/ Or 2m- QAM, m >=6.
In conjunction with the first possible implementation of the 5th aspect or the 5th aspect, the 4th kind at the 5th aspect is possible In implementation, the processor is also used to have same band B in predetermined quantity0Minimum subband on carry out first time letter Before number modulation, the bandwidth B of the minimum subband is set according to the limitation of the bandwidth of communication system and system resource0。
In conjunction with the first possible implementation of the 5th aspect or the 5th aspect, the 5th kind at the 5th aspect is possible In implementation, the processor is specifically used for when detecting the power fading after optical fiber link switching, or detects optical fiber When the transmission rate of communication system is lower than rate-valve value, there is same band B in the predetermined quantity0Minimum subband it is enterprising Row first time signal modulation.
In conjunction with the first possible implementation of the 5th aspect, in the 6th kind of possible implementation of the 5th aspect In, the receiver is also used to after the signal for sending the third time signal modulation to the receiving end, receives the reception Hold the subband power of feedback updated again；
The processor is also used to carry out letter again according to the received subband power updated again of the receiver Number modulation；
The transmitter is also used to send the signal that the processor is modulated again to the receiving end.
6th aspect, provides a kind of modulating device of adaptive-bandwidth, comprising:
Receiver, the signal of the first time signal modulation for receiving transmitting terminal transmission；Wherein, the transmitting terminal is predetermined Quantity has same band B0Minimum subband on carry out first time signal modulation；The first time signal modulation is to each institute State the modulation format that minimum subband uses identical low-order-modulated format；
Processor, for obtaining the Signal to Noise Ratio (SNR) of each minimum subband；
The processor is also used to the SNR as adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nPosition In the default section SNR, it is n*B that minimum subband k, k+1 ... k+n, which is merged into bandwidth,0Flexible subband, and using be suitble to The flexible subband is filled in the modulation format of the higher order modulation formats in the default section SNR；The wherein high order modulation lattice The transmission rate of formula is higher than the low-order-modulated format；
Transmitter, for feeding back the bandwidth of the flexible subband and the modulation of the higher order modulation formats to the transmitting terminal Pattern；
The receiver is also used to receive the signal for second of signal modulation that the transmitting terminal is sent.
In conjunction with the 6th aspect, in the first possible implementation of the 6th aspect, the processor is also used to obtaining After the Signal to Noise Ratio (SNR) for obtaining each minimum subband, if the SNR of minimum subband jjLower than preset minimum SNR thresholding, abandon The minimum subband j.
In conjunction with the first possible implementation of the 6th aspect, in second of possible implementation of the 6th aspect In, the SNR that the processor is also used to each subband of the signal according to second of signal modulation updates subband power；
The transmitter is also used to the subband power of the update processor feeding back transmitting terminal；
The receiver is also used to receive the signal for the third time signal modulation that the transmitting terminal is sent.
In conjunction with the first or second of possible implementation of the 6th aspect or the 6th aspect, in the third of the 6th aspect In the possible implementation of kind, the receiving end prestores the minimum threshold error rate BER of at least modulation format known to three kindsiIt is right The SNR answeredmin i, wherein SNRmin i< SNRmin i+1；The known modulation format includes: binary phase shift keying BPSK, four phase shifts Phase keying QPSK, 8- orthogonal amplitude adjusts QAM, 16-QAM, 32-QAM and 2m- QAM, m >=6；
The minimum SNR thresholding is SNRmin 1；
The default section SNR is [SNRmin i, SNRmin i+1)。
In conjunction with the third possible implementation of the 6th aspect, in the 4th kind of possible implementation of the 6th aspect In, the low-order-modulated format includes BPSK and QPSK；
When the low-order-modulated format is BPSK, the higher order modulation formats include QPSK, 8QAM, 16QAM, 32QAM And/or 2m- QAM, m >=6；
When the low-order-modulated format be QPSK when, the higher order modulation formats include 8QAM, 16QAM, 32QAM and/or 2m- QAM, m >=6.
In conjunction with second of possible implementation of the 6th aspect, in the 5th kind of possible implementation of the 6th aspect In, the processor is also used to after the signal for receiving the third time signal modulation that the transmitting terminal is sent, according to each subband SNR update subband power again；
The subband power that the transmitter is also used to again update the processor feeds back the transmitting terminal.
7th aspect, provides a kind of modulating system of adaptive-bandwidth, comprising:
Transmitting terminal, the transmitting terminal is as described in any one of the third aspect or the third aspect implementation；
Receiving end, the receiving end is as described in any one of fourth aspect or fourth aspect implementation.
The embodiment of the invention provides a kind of modulator approaches of adaptive-bandwidth, device and system, and transmitting terminal is in predetermined quantity Have same band B0Minimum subband on carry out first time signal modulation and to receiving end transmitting first time signal modulation Signal.Receiving end obtains the Signal to Noise Ratio (SNR) of each minimum subband from the signal of first time signal modulation, and will be more according to SNR A adjacent sub-bands merge into flexible subband, fill the flexible subband using the modulation format of higher order modulation formats and to transmitting terminal Feed back the bandwidth of flexible subband and the modulation format of the higher order modulation formats, transmitting terminal is according to the bandwidth of flexible subband and described The modulation format of higher order modulation formats carries out second of signal modulation.Compared with prior art, it is possible to reduce number of sub-bands simultaneously has Effect avoids decline point.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with It obtains other drawings based on these drawings.
Fig. 1 is the schematic diagram of the modulator approach of the adaptive-bandwidth of transmitting terminal provided in an embodiment of the present invention；
Fig. 2 is the schematic diagram of the modulator approach of the adaptive-bandwidth of receiving end provided in an embodiment of the present invention；
Fig. 3 is the signaling diagram of the modulator approach of adaptive-bandwidth provided in an embodiment of the present invention；
Fig. 4 is the signaling diagram of the modulator approach of another adaptive-bandwidth provided in an embodiment of the present invention；
Fig. 5 is to merge subband in the embodiment of the present invention and fill the schematic diagram of flexible subband；
Fig. 6 is the block diagram of the adjustment device of the adaptive-bandwidth of transmitting terminal side in the embodiment of the present invention；
Fig. 7 is the block diagram of the adjustment device of another adaptive-bandwidth of transmitting terminal side in the embodiment of the present invention；
Fig. 8 is the block diagram of the adjustment device of the adaptive-bandwidth of receiving end of embodiment of the present invention side；
Fig. 9 is the block diagram of the adjustment device of another adaptive-bandwidth of receiving end of embodiment of the present invention side；
Figure 10 is the block diagram of the modulating device of the adaptive-bandwidth of transmitting terminal side provided in an embodiment of the present invention；
Figure 11 is the block diagram of the modulating device of the adaptive-bandwidth of receiving end side provided in an embodiment of the present 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 only a part of the embodiments of the present invention, instead of all the embodiments.It is based on Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other Embodiment shall fall within the protection scope of the present invention.
The embodiment of the present invention provides a kind of modulator approach of adaptive-bandwidth, is related to transmitting terminal side, as shown in Figure 1, the party Method includes:
101, transmitting terminal has same band B in predetermined quantity0Minimum subband on carry out first time signal modulation.
The first time signal modulation refers to: using each minimum subband the modulation code of identical low-order-modulated format Type.Low-order-modulated format can be binary phase shift keying (Binary Phase Shift Keying, BPSK) or four Xiang Yixiang Keying (Quadrature Phase Shift Keying, QPSK).
102, emit the signal of the first time signal modulation to receiving end.
103, the bandwidth of the flexible subband of the receiving end feedback and the modulation format of higher order modulation formats are received.
Wherein, if the SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nPositioned at default SNR Section, it is n*B that minimum subband k, k+1 ... k+n is merged into bandwidth by receiving end0Flexible subband, and to be suitable for this pre- for use If the modulation format of the higher order modulation formats in the section SNR fills the flexible subband.The transmission rate of higher order modulation formats is higher than The low-order-modulated format.
104, transmitting terminal carries out second of signal tune according to the bandwidth of flexible subband and the modulation format of higher order modulation formats System.
105, emit the signal of second of signal modulation to receiving end.
The transmitting terminal that method shown in FIG. 1 is related to specifically can be light emitting secondary module in actual scene (Transmitter Optical Subassembly, TOSA), receiving end specifically can be light-receiving secondary module (Receiver Optical Subassembly, ROSA).
The modulator approach of adaptive-bandwidth provided in an embodiment of the present invention, transmitting terminal have same band B predetermined quantity0 Minimum subband on carry out first time signal modulation and to receiving end transmitting first time signal modulation signal.Reason is received later The bandwidth of the flexible subband of receiving end feedback and the modulation format of higher order modulation formats, transmitting terminal according to the bandwidth of flexible subband and The modulation format of the higher order modulation formats carries out second of signal modulation.Compared with prior art, the side of the embodiment of the present invention Subband merging is carried out in case, it is possible to reduce number of sub-bands simultaneously effectively avoids decline point.
The embodiment of the present invention also provides a kind of modulator approach of adaptive-bandwidth, is related to receiving end side, as shown in Fig. 2, should Method includes:
201, receiving end receives the signal for the first time signal modulation that transmitting terminal is sent.
Wherein, transmitting terminal has same band B in predetermined quantity0Minimum subband on carry out first time signal modulation. First time signal modulation refers to the modulation format for using each minimum subband identical low-order-modulated format.
202, the SNR of each minimum subband is obtained.
SNR refers to signal-to-noise ratio (Signal-Noise Ratio)
If the 203, SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nPositioned at the default area SNR Between, it is n*B that minimum subband k, k+1 ... k+n, which is merged into bandwidth,0Flexible subband, and use is suitable for the default SNR The modulation format of the higher order modulation formats in section fills the flexible subband.
Wherein the transmission rate of higher order modulation formats is higher than the low-order-modulated format.
204, the bandwidth of flexible subband and the modulation format of higher order modulation formats are fed back to transmitting terminal.
205, the signal for second of signal modulation that the transmitting terminal is sent is received.
The modulator approach of adaptive-bandwidth provided in an embodiment of the present invention, receiving end receive the signal of first time signal modulation Afterwards, subband is merged according to the signal-to-noise ratio of each subband and obtains flexible subband, the bandwidth and high-order of flexible subband are fed back to transmitting terminal The modulation format of modulation format, transmitting terminal are carried out according to the bandwidth of flexible subband and the modulation format of the higher order modulation formats Second of signal modulation.Compared with prior art, subband merging has been carried out in the scheme of the embodiment of the present invention, it is possible to reduce subband Quantity simultaneously effectively avoids decline point.
The modulator approach of adaptive-bandwidth provided in an embodiment of the present invention is described on the whole below with reference to transmitting terminal and receiving end, As shown in Figure 3, comprising:
301, transmitting terminal has same band B in predetermined quantity0Minimum subband on carry out first time signal modulation.
302, emit the signal of the first time signal modulation to receiving end.
303, receiving end obtains the SNR of each minimum subband.
If the 304, SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nPositioned at the default area SNR Between, it is n*B that minimum subband k, k+1 ... k+n, which is merged into bandwidth,0Flexible subband, and using higher order modulation formats Modulation format fills the flexible subband.
305, the bandwidth of flexible subband and the modulation format of higher order modulation formats are fed back to transmitting terminal.
306, transmitting terminal carries out second of signal tune according to the bandwidth of flexible subband and the modulation format of higher order modulation formats System.
307, emit the signal of second of signal modulation to receiving end.
The embodiment of the invention provides a kind of modulator approach of adaptive-bandwidth, transmitting terminal has identical band predetermined quantity Wide B0Minimum subband on carry out first time signal modulation and to receiving end transmitting first time signal modulation signal.Receiving end from The Signal to Noise Ratio (SNR) of each minimum subband is obtained in the signal of first time signal modulation, and is merged multiple adjacent sub-bands according to SNR For flexible subband, the flexible subband is filled using the modulation format of higher order modulation formats and feeds back flexible subband to transmitting terminal The modulation format of bandwidth and the higher order modulation formats, transmitting terminal is according to the bandwidth of flexible subband and the higher order modulation formats Modulation format carries out second of signal modulation.Compared with prior art, it is possible to reduce number of sub-bands simultaneously effectively avoids decline point.
In a kind of specific embodiment provided in an embodiment of the present invention, as shown in Figure 4, comprising:
401, transmitting terminal has same band B in predetermined quantity0Minimum subband on carry out first time signal modulation.
Transmitting terminal sets the bandwidth B of the minimum subband according to the limitation of the bandwidth of communication system and system resource0。
402, emit the signal of the first time signal modulation to receiving end.
403, receiving end obtains the SNR of each minimum subband.
If the 404, SNR of minimum subband jjLower than preset minimum SNR thresholding, the minimum subband j is abandoned.
If the 405, SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nPositioned at the default area SNR Between, it is n*B that minimum subband k, k+1 ... k+n, which is merged into bandwidth,0Flexible subband, and use is suitable for the default SNR The modulation format of the higher order modulation formats in section fills the flexible subband.
Step 404 and 405 execution sequence it is interchangeable.
The definition of preset minimum SNR thresholding and the default section SNR is illustrated below.
The definition in minimum SNR thresholding and the default section SNR and the bit error rate (Bit Error Rate, BER) are related.Receiving end Prestore the minimum threshold BER of at least modulation format known to three kindsiCorresponding SNRmin i, wherein SNRmin i< SNRmin i+1.It is known Modulation format include: BPSK, QPSK, 8- orthogonal amplitude adjustment (Quadrature Amplitude Modulation, QAM), 16-QAM、32-QAM……2m- QAM, m >=6.The minimum SNR thresholding is SNRmin 1；The default section SNR is [SNRmin i, SNRmin i+1)。
If the SNR of minimum subband a is less than SNRmin 1, receiving end will abandon minimum subband a.If adjacent minimum subband The SNR of a1 and minimum subband a2 are located at the default section SNR [SNRmin i, SNRmin i+1), receiving end is by minimum subband a1 and most boy It is 2*B that band a2, which merges into a bandwidth,0Flexible subband, and use is suitable for [SNRmin i, SNRmin i+1) section high order modulation The modulation format of format fills the flexible subband.
By step 404 and step 405, receiving end, which has abandoned some minimum subbands and incorporated some minimum subbands, to be made It obtains number of sub-bands to reduce, and fills flexible subband with the modulation format of higher order modulation formats, as shown in Figure 5.
Low-order-modulated format described in the embodiment of the present invention includes BPSK and QPSK；
Wherein, when low-order-modulated format is BPSK, the higher order modulation formats include QPSK, 8-QAM, 16-QAM, 32- QAM and/or 2m- QAM, m >=6；
When the low-order-modulated format be QPSK when, the higher order modulation formats include 8-QAM, 16-QAM, 32-QAM and/ Or 2m- QAM, m >=6.
406, the bandwidth of flexible subband and the modulation format of higher order modulation formats are fed back to transmitting terminal.
407, transmitting terminal carries out second of signal tune according to the bandwidth of flexible subband and the modulation format of higher order modulation formats System.
408, emit the signal of second of signal modulation to receiving end.
409, receiving end updates subband power according to the SNR of each subband of the signal of second of signal modulation.
410, the subband power updated to transmitting terminal feedback.
411, according to the power of the subband of the update, third time signal modulation is carried out and to described in the transmission of the receiving end The signal of third time signal modulation.
The scheme shown in Fig. 4 of the embodiment of the present invention can be held when transmitting terminal and receiving end auto-negotiation carry out service fulfillment Row, can also be when detecting the power fading after optical fiber link switching, or detects that the transmission rate of optical fiber telecommunications system is low It is executed when rate-valve value.
After step 411 carries out third time signal modulation and sends signal, if the SNR of subband is still undesirable, connect Receiving end updates subband power according to the SNR of each subband herein, and updated subband power is fed back transmitting terminal.Transmitting terminal root Signal modulation is carried out again according to the subband power updated again received and sends signal to receiving end.Repeat this process until Until the SNR of subband meets the requirement of receiving end.
Wherein, receiving end needs to carry out the SNR surplus of each subband when carrying out power update according to the SNR of subband Equalization adjustment, makes the power headroom of each subband reach identical.If the bandwidth of subband K is B (K), power adjustment is needed subband K Relative power parameter Δ PSD (K) update meet the following conditions:If subband K is in BER simultaneously Thresholding at SNR surplus be Mar (K), then need to meet Mar (K)=Mar0, Mar0It is averaged for the SNR surplus of each subband Change the value of processing.
The embodiment of the invention provides a kind of modulator approach of adaptive-bandwidth, transmitting terminal has identical band predetermined quantity Wide B0Minimum subband on carry out first time signal modulation and to receiving end transmitting first time signal modulation signal.Receiving end from It obtains the Signal to Noise Ratio (SNR) of each minimum subband in the signal of first time signal modulation, and subband is abandoned according to SNR or by multiple phases Adjacent subband merges into flexible subband, fills the flexible subband using the modulation format of higher order modulation formats and feeds back to transmitting terminal The flexible bandwidth of subband and the modulation format of the higher order modulation formats, bandwidth and the high-order of the transmitting terminal according to flexible subband The modulation format of modulation format carries out second of signal modulation.Compared with prior art, it is possible to reduce number of sub-bands is simultaneously effectively kept away Decline point is opened, and high order modulation makes transmission rate be guaranteed.In addition the reduction of number of sub-bands is also reduced to resource Demand and power consumption promote flexibility to reduce the complexity of system.
Also, receiving end updates subband power according to the SNR of each subband of the signal of second of signal modulation and will more New subband power feeds back transmitting terminal.Transmitting terminal carries out third time signal modulation according to the power of the subband of update.When subband When SNR is still undesirable, receiving end can update subband power again, and transmitting terminal is according to the subband updated again received Power carries out signal modulation again and sends signal to receiving end.This process is repeated until the SNR of subband meets wanting for receiving end Until asking.To further ensure subband power.
The embodiment of the invention also provides a kind of adjustment devices of adaptive-bandwidth, are located at transmitting terminal side, as shown in fig. 6, The device includes:
Modulation unit 61, for there is same band B in predetermined quantity0Minimum subband on carry out first time signal tune System；The first time signal modulation uses each minimum subband the modulation format of identical low-order-modulated format.
Transmitting unit 62, for emitting the signal of 61 first time of the modulation unit signal modulation to receiving end.
Receiving unit 63, for receiving the bandwidth of the flexible subband of the receiving end feedback and the modulation of higher order modulation formats Pattern；Wherein, if the SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nPositioned at the default area SNR Between, it is n*B that minimum subband k, k+1 ... k+n is merged into bandwidth by the receiving end0Flexible subband, and use high-order The modulation format of modulation format fills the flexible subband, and the transmission rate of the higher order modulation formats is higher than the low-order-modulated Format.
The modulation unit 61 is also used to according to the bandwidth of the received flexible subband of the receiving unit 63 and described The modulation format of higher order modulation formats carries out second of signal modulation.
The transmitting unit 62 is also used to emit to the receiving end letter of second of the signal modulation of the modulation unit 61 Number.
The receiving unit 63 is also used to receive the subband power of the update of the receiving end feedback；
The modulation unit 61 is also used to the power of the subband according to the received update of the receiving unit 63, carries out Third time signal modulation；
The transmitting unit 62 is also used to send the letter of the 61 third time signal modulation of modulation unit to the receiving end Number.
The low-order-modulated format includes BPSK and QPSK.
When the low-order-modulated format is BPSK, the higher order modulation formats include QPSK, 8-QAM, 16-QAM, 32- QAM and/or 2m- QAM, m >=6；
When the low-order-modulated format be QPSK when, the higher order modulation formats include 8-QAM, 16-QAM, 32-QAM and/ Or 2m- QAM, m >=6.
As shown in fig. 7, the device further includes bandwidth setup unit 64, for the having in predetermined quantity in modulation unit 61 Same band B0Minimum subband on carry out first time signal modulation before, according to the bandwidth of communication system limitation and system resource set The bandwidth B of the fixed minimum subband0。
The modulation unit 61 is specifically used for when detecting the power fading after optical fiber link switching, or detects optical fiber When the transmission rate of communication system is lower than rate-valve value, there is same band B in the predetermined quantity0Minimum subband it is enterprising Row first time signal modulation.
The receiving unit 63 is also used to after the signal for sending the third time signal modulation to the receiving end, is received The subband power of the receiving end feedback updated again；
The modulation unit 61 is also used to according to the received subband power updated again of the receiving unit 63, then Secondary carry out signal modulation；
The transmitting unit 62 is also used to send the signal that the modulation unit 61 is modulated again to the receiving end.
The embodiment of the invention also provides a kind of adjustment devices of adaptive-bandwidth, are located at receiving end side, as shown in figure 8, The device includes:
Receiving unit 81, the signal of the first time signal modulation for receiving transmitting terminal transmission；Wherein, the transmitting terminal exists Predetermined quantity has same band B0Minimum subband on carry out first time signal modulation；The first time signal modulation is to every A minimum subband uses the modulation format of identical low-order-modulated format；
Signal-to-noise ratio acquiring unit 82, for obtaining the Signal to Noise Ratio (SNR) of each minimum subband；
Sub-band processing unit 83, for working as the SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+n Positioned at the default section SNR, it is n*B that minimum subband k, k+1 ... k+n, which is merged into bandwidth,0Flexible subband, and using high The modulation format of rank modulation format fills the flexible subband；Wherein the transmission rate of the higher order modulation formats is higher than described low Rank modulation format；
Transmitting unit 84, for feed back to the transmitting terminal the flexible subband bandwidth and the higher order modulation formats Modulation format；
The receiving unit 81 is also used to receive the signal for second of signal modulation that the transmitting terminal is sent.
It states sub-band processing unit 83 to be also used to after the Signal to Noise Ratio (SNR) for obtaining each minimum subband, if most boy SNR with jjLower than preset minimum SNR thresholding, the minimum subband j is abandoned.
As shown in figure 9, described device further include:
Power updating unit 85, the SNR for each subband according to the signal of second of signal modulation update son Band power；
The subband power that the transmitting unit 84 is also used to update the power updating unit 85 feeds back transmitting terminal；
The receiving unit 81 is also used to receive the signal for the third time signal modulation that the transmitting terminal is sent.
The power updating unit 85 is also used to after the signal for receiving the third time signal modulation that the transmitting terminal is sent, Subband power is updated again according to the SNR of each subband；
The subband power that the transmitting unit 84 is also used to again update the power updating unit 85 feeds back the hair Penetrate end.
The embodiment of the invention provides adaptive-bandwidth modulating device, transmitting terminal predetermined quantity have same band B0Minimum subband on carry out first time signal modulation and to receiving end transmitting first time signal modulation signal.Receiving end is from The Signal to Noise Ratio (SNR) of each minimum subband is obtained in the signal of signal modulation, and is merged into multiple adjacent sub-bands according to SNR Flexible subband fills the flexible subband using the modulation format of higher order modulation formats and feeds back the band of flexible subband to transmitting terminal The modulation format of the wide and described higher order modulation formats, transmitting terminal is according to the bandwidth of flexible subband and the tune of the higher order modulation formats Pattern processed carries out second of signal modulation.Compared with prior art, it is possible to reduce number of sub-bands simultaneously effectively avoids decline point.
The embodiment of the present invention also provides a kind of modulating device of adaptive-bandwidth, is related to transmitting terminal side, as shown in Figure 10, packet Include processor 1001, transmitter 1002, receiver 1003.
Processor 1001 is used to have same band B in predetermined quantity0Minimum subband on carry out first time signal tune System；The first time signal modulation uses each minimum subband the modulation format of identical low-order-modulated format；
Transmitter 1002 is used to emit to receiving end the signal of 1001 first time of the processor signal modulation；
Receiver 1003 is used to receive the bandwidth of the flexible subband of the receiving end feedback and the modulation of higher order modulation formats Pattern；Wherein, if the SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nPositioned at the default area SNR Between, it is n*B that minimum subband k, k+1 ... k+n is merged into bandwidth by the receiving end0Flexible subband, and use high-order The modulation format of modulation format fills the flexible subband, and the transmission rate of the higher order modulation formats is higher than the low-order-modulated Format；
The processor 1001 is also used to according to the bandwidth of the received flexible subband of the receiver 1003 and described The modulation format of higher order modulation formats carries out second of signal modulation；
The transmitter 1002 is also used to emit to the receiving end letter of second of the signal modulation of the processor 1001 Number.
Further, the receiver 1003 is also used to receive the subband power of the update of the receiving end feedback；
The processor 1001 is also used to the power of the subband according to the received update of the receiver 1003, carries out Third time signal modulation；
The transmitter 1002 is also used to send the letter of the 1001 third time signal modulation of processor to the receiving end Number.
The processor 1001 is also used to have same band B in predetermined quantity0Minimum subband on carry out for the first time Before signal modulation, the bandwidth B of the minimum subband is set according to the limitation of the bandwidth of communication system and system resource0。
In a kind of optional implementation of the embodiment of the present invention, the processor 1001, which is specifically used for working as, detects light When power fading after fine link switching, or when detecting the transmission rate of optical fiber telecommunications system lower than rate-valve value, described Predetermined quantity has same band B0Minimum subband on carry out first time signal modulation.
In another optional implementation of the embodiment of the present invention, the receiver 1003 is also used to the reception After end sends the signal of the third time signal modulation, the subband power of the receiving end feedback updated again is received；It is described Processor 1001 is also used to carry out signal tune again according to the received subband power updated again of the receiver 1003 System；The transmitter 1002 is also used to send the signal that the processor is modulated again to the receiving end.
The embodiment of the present invention also provides a kind of modulating device of adaptive-bandwidth, is related to receiving end side, as shown in figure 11, packet It includes:
Receiver 1101, the signal of the first time signal modulation for receiving transmitting terminal transmission；Wherein, the transmitting terminal exists Predetermined quantity has same band B0Minimum subband on carry out first time signal modulation；The first time signal modulation is to every A minimum subband uses the modulation format of identical low-order-modulated format；
Processor 1102, for obtaining the Signal to Noise Ratio (SNR) of each minimum subband；
The processor 1102 is also used to the SNR as adjacent minimum subband k, k+1 ... k+nk、SNRk+1、…… SNRk+nPositioned at the default section SNR, it is n*B that minimum subband k, k+1 ... k+n, which is merged into bandwidth,0Flexible subband, and The flexible subband is filled using the modulation format of higher order modulation formats；Wherein the transmission rate of the higher order modulation formats is higher than The low-order-modulated format；
Transmitter 1103, for feed back to the transmitting terminal the flexible subband bandwidth and the higher order modulation formats Modulation format；
The receiver 1101 is also used to receive the signal for second of signal modulation that the transmitting terminal is sent.
The processor 1102 is also used to after the Signal to Noise Ratio (SNR) for obtaining each minimum subband, if minimum subband j SNRjLower than preset minimum SNR thresholding, the minimum subband j is abandoned.
Further, the processor 1102 is also used to each subband of the signal according to second of signal modulation SNR updates subband power；
The subband power that the transmitter 1103 is also used to update the processor 1102 feeds back transmitting terminal；
The receiver 1101 is also used to receive the signal for the third time signal modulation that the transmitting terminal is sent.
Further, the processor 1101 is also used in the letter for receiving the third time signal modulation that the transmitting terminal is sent After number, subband power is updated according to the SNR of each subband again；The transmitter 1103 is also used to the processor 1101 again The subband power of secondary update feeds back the transmitting terminal.
The embodiment of the invention provides adaptive-bandwidth modulating device, transmitting terminal predetermined quantity have same band B0Minimum subband on carry out first time signal modulation and to receiving end transmitting first time signal modulation signal.Receiving end is from The Signal to Noise Ratio (SNR) of each minimum subband is obtained in the signal of signal modulation, and is merged into multiple adjacent sub-bands according to SNR Flexible subband fills the flexible subband using the modulation format of higher order modulation formats and feeds back the band of flexible subband to transmitting terminal The modulation format of the wide and described higher order modulation formats, transmitting terminal is according to the bandwidth of flexible subband and the tune of the higher order modulation formats Pattern processed carries out second of signal modulation.Compared with prior art, it is possible to reduce number of sub-bands simultaneously effectively avoids decline point.
The embodiment of the invention provides adaptive-bandwidth modulating system, which includes transmitting terminal and receiving end, wherein It include the device as described in Fig. 6 or Fig. 7 in transmitting terminal, receiving end includes the device as described in Fig. 8 or Fig. 9.
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 (40)

1. a kind of modulator approach of adaptive-bandwidth characterized by comprising
Transmitting terminal has same band B predetermined quantity0Minimum subband on carry out first time signal modulation；The first time Signal modulation uses each minimum subband the modulation format of identical low-order-modulated format；
Emit the signal of the first time signal modulation to receiving end；
Receive the bandwidth of the flexible subband of the receiving end feedback and the modulation format of higher order modulation formats；Wherein, if it is adjacent Minimum subband k, k+1 ... k+n SNRk、SNRk+1、……SNRk+nPositioned at the default section SNR, the receiving end will be described It is n*B that minimum subband k, k+1 ... k+n, which merges into bandwidth,0Flexible subband, and using being suitable for the default section SNR The modulation format of higher order modulation formats fills the flexible subband, and the transmission rate of the higher order modulation formats is higher than the low order Modulation format；
Transmitting terminal carries out second of signal tune according to the bandwidth of the flexible subband and the modulation format of the higher order modulation formats System；
Emit the signal of second of signal modulation to the receiving end.
2. the method according to claim 1, wherein emitting second of signal modulation to the receiving end Signal after, further includes:
Receive the subband power of the update of the receiving end feedback；
Transmitting terminal carries out third time signal modulation according to the power of the subband of the update；
The signal of the third time signal modulation is sent to the receiving end.
3. method according to claim 1 or 2, which is characterized in that the receiving end prestores and modulates at least known to three kinds The minimum threshold error rate BER of formatiCorresponding SNRmin i, wherein SNRmin i< SNRmin i+1；The known modulation format includes: Binary phase shift keying BPSK, quaternary PSK QPSK, 8- orthogonal amplitude adjust QAM, 16-QAM, 32-QAM and 2m- QAM, m ≥6；
The default section SNR is [SNRmin i, SNRmin i+1)。
4. according to the method described in claim 3, it is characterized in that, the low-order-modulated format includes the BPSK and QPSK；
When the low-order-modulated format is BPSK, the higher order modulation formats include QPSK, 8-QAM, 16-QAM, 32-QAM And/or 2m- QAM, m >=6；
When the low-order-modulated format is QPSK, the higher order modulation formats include 8-QAM, 16-QAM, 32-QAM and/or 2m- QAM, m >=6.
5. method according to claim 1 or 2, which is characterized in that there is same band B in predetermined quantity in transmitting terminal0 Minimum subband on carry out first time signal modulation before, further includes:
The bandwidth B of the minimum subband is set according to the limitation of the bandwidth of communication system and system resource0。
6. method according to claim 1 or 2, which is characterized in that power fading after detecting optical fiber link switching When, or when detecting the transmission rate of optical fiber telecommunications system lower than rate-valve value, tool of the transmitting terminal in the predetermined quantity There is same band B0Minimum subband on carry out first time signal modulation.
7. according to the method described in claim 2, it is characterized in that, sending the third time signal modulation to the receiving end Signal after, further includes:
Receive the subband power of the receiving end feedback updated again；
According to the subband power updated again, signal modulation is carried out again；
The signal of signal modulation again is sent to the receiving end.
8. a kind of modulator approach of adaptive-bandwidth characterized by comprising
Receiving end receives the signal for the first time signal modulation that transmitting terminal is sent；Wherein, tool of the transmitting terminal in predetermined quantity There is same band B0Minimum subband on carry out first time signal modulation；The first time signal modulation is to each most boy With the modulation format using identical low-order-modulated format；
Obtain the Signal to Noise Ratio (SNR) of each minimum subband；
If the SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nIt, will be described positioned at the default section SNR It is n*B that minimum subband k, k+1 ... k+n, which merges into bandwidth,0Flexible subband, and using being suitable for the default section SNR The modulation format of higher order modulation formats fills the flexible subband；Wherein the transmission rate of the higher order modulation formats is higher than described Low-order-modulated format；
The bandwidth of the flexible subband and the modulation format of the higher order modulation formats are fed back to the transmitting terminal；
Receive the signal for second of signal modulation that the transmitting terminal is sent.
9. according to the method described in claim 8, it is characterized in that, after the Signal to Noise Ratio (SNR) for obtaining each minimum subband, Further include:
If the SNR of minimum subband jjLower than preset minimum SNR thresholding, the minimum subband j is abandoned.
10. according to the method described in claim 9, it is characterized in that, receiving second of signal modulation that the transmitting terminal is sent Signal after, further includes:
Subband power is updated according to the SNR of each subband of the signal of second of signal modulation；
The subband power of update is fed back into transmitting terminal；
Receive the signal for the third time signal modulation that the transmitting terminal is sent.
11. according to the method described in claim 9, it is characterized in that, the receiving end, which prestores, at least modulates lattice known to three kinds The minimum threshold error rate BER of formulaiCorresponding SNRmin i, wherein SNRmin i< SNRmin i+1；The known modulation format includes: two System phase-shift keying BPSK, quaternary PSK QPSK, 8- orthogonal amplitude adjust QAM, 16-QAM, 32-QAM and 2m- QAM, m >= 6；
The minimum SNR thresholding is SNRmin 1；
The default section SNR is [SNRmin i, SNRmin i+1)。
12. according to the method for claim 11, which is characterized in that the low-order-modulated format includes BPSK and QPSK；
When the low-order-modulated format be BPSK when, the higher order modulation formats include QPSK, 8QAM, 16QAM, 32QAM and/or 2m- QAM, m >=6；
When the low-order-modulated format is QPSK, the higher order modulation formats include 8QAM, 16QAM, 32QAM and/or 2m- QAM, m >=6.
13. according to the method described in claim 10, it is characterized in that, in the third time signal tune for receiving the transmitting terminal transmission After the signal of system, further includes:
Subband power is updated again according to the SNR of each subband；
The subband power updated again is fed back into the transmitting terminal.
14. a kind of modulating device of adaptive-bandwidth characterized by comprising
Modulation unit, for there is same band B in predetermined quantity0Minimum subband on carry out first time signal modulation；It is described First time signal modulation uses each minimum subband the modulation format of identical low-order-modulated format；
Transmitting unit, for emitting the signal of the modulation unit first time signal modulation to receiving end；
Receiving unit, for receiving the bandwidth of the flexible subband of the receiving end feedback and the modulation format of higher order modulation formats； Wherein, if the SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nIt is described positioned at the default section SNR It is n*B that minimum subband k, k+1 ... k+n is merged into bandwidth by receiving end0Flexible subband, and use be suitable for it is described pre- If the modulation format of the higher order modulation formats in the section SNR fills the flexible subband, the transmission rate of the higher order modulation formats Higher than the low-order-modulated format；
The modulation unit is also used to bandwidth and the high order modulation according to the received flexible subband of the receiving unit The modulation format of format carries out second of signal modulation；
The transmitting unit is also used to emit to the receiving end signal of second of signal modulation of the modulation unit.
15. the modulating device of adaptive-bandwidth according to claim 14, which is characterized in that the receiving unit is also used to connect Receive the subband power of the update of the receiving end feedback；
The modulation unit is also used to the power of the subband according to the received update of the receiving unit, carries out third time letter Number modulation；
The transmitting unit is also used to send the signal of the modulation unit third time signal modulation to the receiving end.
16. the modulating device of adaptive-bandwidth according to claim 14 or 15, which is characterized in that the receiving end prestores The minimum threshold error rate BER of modulation format at least known to three kindsiCorresponding SNRmin i, wherein SNRmin i< SNRmin i+1；It is described Known modulation format includes: binary phase shift keying BPSK, the adjustment of quaternary PSK QPSK, 8- orthogonal amplitude QAM, 16- QAM, 32-QAM and 2m- QAM, m >=6；
The default section SNR is [SNRmin i, SNRmin i+1)。
17. the modulating device of adaptive-bandwidth according to claim 16, which is characterized in that the low-order-modulated format includes The BPSK and QPSK；
When the low-order-modulated format is BPSK, the higher order modulation formats include QPSK, 8-QAM, 16-QAM, 32-QAM And/or 2m- QAM, m >=6；
When the low-order-modulated format is QPSK, the higher order modulation formats include 8-QAM, 16-QAM, 32-QAM and/or 2m- QAM, m >=6.
18. the modulating device of adaptive-bandwidth according to claim 14 or 15, which is characterized in that further include: band width setting Unit, for there is same band B in predetermined quantity in the modulation unit0Minimum subband on carry out first time signal tune Before system, the bandwidth B of the minimum subband is set according to the limitation of the bandwidth of communication system and system resource0。
19. the modulating device of adaptive-bandwidth according to claim 14 or 15, which is characterized in that the modulation unit is specific For when detecting the power fading after optical fiber link switching, or detect the transmission rate of optical fiber telecommunications system lower than rate When threshold value, there is same band B in the predetermined quantity0Minimum subband on carry out first time signal modulation.
20. the modulating device of adaptive-bandwidth according to claim 15, which is characterized in that the receiving unit is also used to After the signal for sending the third time signal modulation to the receiving end, the subband of the receiving end feedback updated again is received Power；
The modulation unit is also used to carry out letter again according to the received subband power updated again of the receiving unit Number modulation；
The transmitting unit is also used to send the signal that the modulation unit is modulated again to the receiving end.
21. a kind of modulating device of adaptive-bandwidth characterized by comprising
Receiving unit, the signal of the first time signal modulation for receiving transmitting terminal transmission；Wherein, the transmitting terminal is in predetermined number Amount has same band B0Minimum subband on carry out first time signal modulation；The first time signal modulation is to each described Minimum subband uses the modulation format of identical low-order-modulated format；
Signal-to-noise ratio acquiring unit, for obtaining the Signal to Noise Ratio (SNR) of each minimum subband；
Sub-band processing unit, for working as the SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nPositioned at pre- If the section SNR, it is n*B that minimum subband k, k+1 ... k+n, which is merged into bandwidth,0Flexible subband, and use is suitable for institute The modulation format for stating the higher order modulation formats in the default section SNR fills the flexible subband；The wherein higher order modulation formats Transmission rate is higher than the low-order-modulated format；
Transmitting unit, for feeding back the bandwidth of the flexible subband and the modulation code of the higher order modulation formats to the transmitting terminal Type；
The receiving unit is also used to receive the signal for second of signal modulation that the transmitting terminal is sent.
22. the modulating device of adaptive-bandwidth according to claim 21, which is characterized in that the sub-band processing unit is also used After the Signal to Noise Ratio (SNR) in each minimum subband of acquisition, if the SNR of minimum subband jjIt is SNR minimum lower than preset Limit abandons the minimum subband j.
23. the modulating device of adaptive-bandwidth according to claim 22, which is characterized in that further include:
Power updating unit, the SNR for each subband according to the signal of second of signal modulation update subband power；
The subband power that the transmitting unit is also used to update the power updating unit feeds back transmitting terminal；
The receiving unit is also used to receive the signal for the third time signal modulation that the transmitting terminal is sent.
24. the modulating device of adaptive-bandwidth according to claim 22, which is characterized in that the receiving unit prestore to The minimum threshold error rate BER of modulation format known to three kinds fewiCorresponding SNRmin i, wherein SNRmin i< SNRmin i+1；It is described Know modulation format include: binary phase shift keying BPSK, quaternary PSK QPSK, 8- orthogonal amplitude adjustment QAM, 16-QAM, 32-QAM and 2m- QAM, m >=6；
The minimum SNR thresholding is SNRmin 1；
The default section SNR is [SNRmin i, SNRmin i+1)。
25. the modulating device of adaptive-bandwidth according to claim 24, which is characterized in that the low-order-modulated format includes BPSK and QPSK；
When the low-order-modulated format be BPSK when, the higher order modulation formats include QPSK, 8QAM, 16QAM, 32QAM and/or 2m- QAM, m >=6；
When the low-order-modulated format is QPSK, the higher order modulation formats include 8QAM, 16QAM, 32QAM and/or 2m- QAM, m >=6.
26. the modulating device of adaptive-bandwidth according to claim 23, which is characterized in that the power updating unit is also used In after the signal for receiving the third time signal modulation that the transmitting terminal is sent, subband is updated according to the SNR of each subband again Power；
The subband power that the transmitting unit is also used to again update the power updating unit feeds back the transmitting terminal.
27. a kind of modulating device of adaptive-bandwidth characterized by comprising
Processor, for there is same band B in predetermined quantity0Minimum subband on carry out first time signal modulation；Described Signal modulation uses each minimum subband the modulation format of identical low-order-modulated format；
Transmitter, for emitting the signal of the processor first time signal modulation to receiving end；
Receiver, for receiving the bandwidth of the flexible subband of the receiving end feedback and the modulation format of higher order modulation formats；Its In, if the SNR of adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nIt is described to connect positioned at the default section SNR It is n*B that minimum subband k, k+1 ... k+n is merged into bandwidth by receiving end0Flexible subband, and use be suitable for it is described default The modulation format of the higher order modulation formats in the section SNR fills the flexible subband, and the transmission rate of the higher order modulation formats is high In the low-order-modulated format；
The processor is also used to bandwidth and the higher order modulation formats according to the received flexible subband of the receiver Modulation format, carry out second of signal modulation；
The transmitter is also used to emit to the receiving end signal of second of signal modulation of the processor.
28. the modulating device of adaptive-bandwidth according to claim 27, which is characterized in that the receiver is also used to receive The subband power of the update of the receiving end feedback；
The processor is also used to the power of the subband according to the received update of the receiver, carries out third time signal tune System；
The transmitter is also used to send the signal of the processor third time signal modulation to the receiving end.
29. the modulating device of the adaptive-bandwidth according to claim 27 or 28, which is characterized in that the receiving end prestores The minimum threshold error rate BER of modulation format at least known to three kindsiCorresponding SNRmin i, wherein SNRmin i< SNRmin i+1；It is described Known modulation format includes: binary phase shift keying BPSK, the adjustment of quaternary PSK QPSK, 8- orthogonal amplitude QAM, 16- QAM, 32-QAM and 2m- QAM, m >=6；
The default section SNR is [SNRmin i, SNRmin i+1)。
30. the modulating device of adaptive-bandwidth according to claim 29, which is characterized in that the low-order-modulated format includes The BPSK and QPSK；
When the low-order-modulated format is BPSK, the higher order modulation formats include QPSK, 8-QAM, 16-QAM, 32-QAM And/or 2m- QAM, m >=6；
When the low-order-modulated format is QPSK, the higher order modulation formats include 8-QAM, 16-QAM, 32-QAM and/or 2m- QAM, m >=6.
31. the modulating device of the adaptive-bandwidth according to claim 27 or 28, which is characterized in that the processor is also used to There is same band B in predetermined quantity0Minimum subband on carry out first time signal modulation before, according to the bandwidth of communication system Limitation and system resource set the bandwidth B of the minimum subband0。
32. the modulating device of the adaptive-bandwidth according to claim 27 or 28, which is characterized in that the processing implement body is used In when detecting the power fading after optical fiber link switching, or detect the transmission rate of optical fiber telecommunications system lower than rate threshold When value, there is same band B in the predetermined quantity0Minimum subband on carry out first time signal modulation.
33. the modulating device of adaptive-bandwidth according to claim 28, which is characterized in that the receiver be also used to After the receiving end sends the signal of the third time signal modulation, the subband function of the receiving end feedback updated again is received Rate；
The processor is also used to carry out signal tune again according to the received subband power updated again of the receiver System；
The transmitter is also used to send the signal that the processor is modulated again to the receiving end.
34. a kind of modulating device of adaptive-bandwidth characterized by comprising
Receiver, the signal of the first time signal modulation for receiving transmitting terminal transmission；Wherein, the transmitting terminal is in predetermined quantity Have same band B0Minimum subband on carry out first time signal modulation；The first time signal modulation to it is each it is described most Small subband uses the modulation format of identical low-order-modulated format；
Processor, for obtaining the Signal to Noise Ratio (SNR) of each minimum subband；
The processor is also used to the SNR as adjacent minimum subband k, k+1 ... k+nk、SNRk+1、……SNRk+nPositioned at default The section SNR, it is n*B that minimum subband k, k+1 ... k+n, which is merged into bandwidth,0Flexible subband, and use be suitable for it is described The modulation format of the higher order modulation formats in the default section SNR fills the flexible subband；The wherein biography of the higher order modulation formats Defeated rate is higher than the low-order-modulated format；
Transmitter, for feeding back the bandwidth of the flexible subband and the modulation code of the higher order modulation formats to the transmitting terminal Type；
The receiver is also used to receive the signal for second of signal modulation that the transmitting terminal is sent.
35. the modulating device of adaptive-bandwidth according to claim 34, which is characterized in that the processor is also used to obtaining After the Signal to Noise Ratio (SNR) for obtaining each minimum subband, if the SNR of minimum subband jjLower than preset minimum SNR thresholding, abandon The minimum subband j.
36. the modulating device of adaptive-bandwidth according to claim 35, which is characterized in that the processor is also used to basis The SNR of each subband of the signal of second of signal modulation updates subband power；
The transmitter is also used to the subband power of the update processor feeding back transmitting terminal；
The receiver is also used to receive the signal for the third time signal modulation that the transmitting terminal is sent.
37. the modulating device of adaptive-bandwidth according to claim 35, which is characterized in that the receiving end prestores at least The minimum threshold error rate BER of modulation format known to three kindsiCorresponding SNRmin i, wherein SNRmin i< SNRmin i+1；It is described known Modulation format includes: binary phase shift keying BPSK, the adjustment of quaternary PSK QPSK, 8- orthogonal amplitude QAM, 16-QAM, 32- QAM and 2m- QAM, m >=6；
The minimum SNR thresholding is SNRmin 1；
The default section SNR is [SNRmin i, SNRmin i+1)。
38. the modulating device of the adaptive-bandwidth according to claim 37, which is characterized in that the low-order-modulated format includes BPSK and QPSK；
When the low-order-modulated format be BPSK when, the higher order modulation formats include QPSK, 8QAM, 16QAM, 32QAM and/or 2m- QAM, m >=6；
When the low-order-modulated format is QPSK, the higher order modulation formats include 8QAM, 16QAM, 32QAM and/or 2m- QAM, m >=6.
39. the modulating device of adaptive-bandwidth according to claim 36, which is characterized in that the processor is also used to connecing After the signal for receiving the third time signal modulation that the transmitting terminal is sent, subband power is updated according to the SNR of each subband again；
The subband power that the transmitter is also used to again update the processor feeds back the transmitting terminal.
40. a kind of modulating system of adaptive-bandwidth characterized by comprising
Transmitting terminal, the transmitting terminal is as described in claim 14-20 any one；
Receiving end, the receiving end is as described in claim 21-26 any one.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101061654A (en) * 2004-11-19 2007-10-24 松下电器产业株式会社 Communication device, communication system and communication method
US7489665B1 (en) * 2003-10-29 2009-02-10 Regents Of The University Of Minnesota Enhanced time resolution using multiple receptions
CN102970268A (en) * 2012-11-27 2013-03-13 陕西天思信息科技有限公司 OFDM (Orthogonal Frequency Division Multiplexing) adaptive modulation system for EOC (Ethernet Over Coax) device
CN103297191A (en) * 2013-05-21 2013-09-11 江苏物联网研究发展中心 Data acquisition method for automatically adjusting wireless transmission rate and data acquisition system

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102468920B (en) * 2010-11-01 2014-11-05 华为技术有限公司 Method, device and system for self-adaption code modulation

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7489665B1 (en) * 2003-10-29 2009-02-10 Regents Of The University Of Minnesota Enhanced time resolution using multiple receptions
CN101061654A (en) * 2004-11-19 2007-10-24 松下电器产业株式会社 Communication device, communication system and communication method
CN102970268A (en) * 2012-11-27 2013-03-13 陕西天思信息科技有限公司 OFDM (Orthogonal Frequency Division Multiplexing) adaptive modulation system for EOC (Ethernet Over Coax) device
CN103297191A (en) * 2013-05-21 2013-09-11 江苏物联网研究发展中心 Data acquisition method for automatically adjusting wireless transmission rate and data acquisition system

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