CN106302294A - A kind of signal modulation, demodulation method and device - Google Patents

A kind of signal modulation, demodulation method and device Download PDF

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Publication number
CN106302294A
CN106302294A CN201610730699.6A CN201610730699A CN106302294A CN 106302294 A CN106302294 A CN 106302294A CN 201610730699 A CN201610730699 A CN 201610730699A CN 106302294 A CN106302294 A CN 106302294A
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signal
modulation
road
subsignal
obtains
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忻向军
刘博�
张丽佳
周延
张琦
王拥军
尹霄丽
田清华
田凤
李博文
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Beijing University of Posts and Telecommunications
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Beijing University of Posts and Telecommunications
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2691—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation involving interference determination or cancellation

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)

Abstract

The embodiment of the invention discloses a kind of signal modulation, demodulation method and device, described modulator approach includes: utilizes and presets modulation technique, carries out signal to be transmitted modulating for the first time；Signal after modulation for the first time is carried out serial to parallel conversion, obtains N way signal；For each way signal in described N way signal, utilize bank of filters based on wavelet analysis technology, carry out second time and modulate, obtain the subsignal after the modulation of N road；Subsignal after modulating described N road carries out parallel serial conversion, obtains a road complex signal；Described complex signal is modulated to real number signal.Utilize the embodiment of the present invention, improve the availability of frequency spectrum.

Description

A kind of signal modulation, demodulation method and device
Technical field
The present invention relates to technical field of photo communication, particularly to a kind of signal modulation, demodulation method and device.
Background technology
Along with the development of society, the data transmission performance of optical communication system is required more and more higher by people, and for future The design of optical communication system, ultimate challenge is the availability of frequency spectrum how improving system in high rate data transmission system, wherein, frequently Spectrum utilization rate is to weigh the index (being primarily referred to as transmitted bit speed/optical signal occupied bandwidth) of communications system transmission efficiency.
OFDM (OFDM) is a kind of special multi-transceiver technology, strengthens by extending the cycle of transmission symbol The ability of opposing multipath fading, is a kind of new and effective digital modulation technique.It is by MCM (Multi-Carrier Modulation, multi-carrier modulation) develop, it is one of the implementation of multi-carrier transmission scheme, its modulation and demodulation It is based respectively on an inverse fast fourier (IFFT) and fast Fourier transform (FFT) realizes.The ultimate principle of OFDM Being: break a channel into some orthogonal sub-channels that high-speed data signal is converted into parallel low speed sub data flow, modulation is to each It is transmitted in subchannel.OFDM technology is applied to the light orthogonal frequency division multiplexi (OOFDM) of optical communication field, its conduct A kind of frequency domain modulation technology, is one the most potential high speed long-distance optical communication technology.
In ofdm communication system, when transfer rate uprises due to the interference of channel, overlap between OFDM symbol, can be produced To such an extent as to produce intersymbol interference (ISI).In order to reduce ISI, when needing that each symbol in an ofdm system inserts protection Between, but now due to the impact of multipath effect, subcarrier may not keep mutually orthogonal, thus introduces inter-sub-carrier interference (ICI).In order to reduce ICI, OFDM symbol needs to send cyclic extensions signal, referred to as Cyclic Prefix (CP) in guard time. Cyclic extensions signal owing to sending in guard time is garbage signal, causes the spectrum utilization reducing in ofdm system Rate.
Summary of the invention
The purpose of the embodiment of the present invention is to provide a kind of signal modulation, demodulation method and device, to improve spectrum utilization Rate.
For reaching above-mentioned purpose, the embodiment of the invention discloses a kind of signal modulating method, method includes:
Utilize and preset modulation technique, carry out signal to be transmitted modulating for the first time；
Signal after modulation for the first time is carried out serial to parallel conversion, obtains N way signal；
For each way signal in described N way signal, utilize bank of filters based on wavelet analysis technology, carry out Second time modulation, obtains the subsignal after the modulation of N road；
Subsignal after modulating described N road carries out parallel serial conversion, obtains a road complex signal；
Described complex signal is modulated to real number signal.
It is also preferred that the left described default modulation technique, the one including in following modulation technique:
Quadrature amplitude modulation technology, amplitude-shift keying modulation technique, shift keying modulation technology or PSK Modulation Technology.
It is also preferred that the left modulation technique is preset in described utilization, carry out signal to be transmitted modulating for the first time, including:
Utilize and preset modulation technique, signal to be transmitted is carried out multi-standard modulation.
It is also preferred that the left described for each way signal in described N way signal, utilize filter based on wavelet analysis technology Ripple device group, carries out second time and modulates, and obtains the subsignal after the modulation of N road, including:
For each way signal, described subsignal is up-sampled, the subsignal after being up-sampled；
Subsignal after described up-sampling is processed by the high pass filter utilizing described bank of filters to comprise, and obtains height Frequently signal；
Subsignal length before utilizing the low pass filter pair that described bank of filters comprises to up-sample with this road identical zero Sequence signal processes, and obtains low frequency signal；
Utilize wavelet analysis technology, synthesize described high-frequency signal and described low frequency signal, the subsignal after being modulated.
It is also preferred that the left described N road modulation after subsignal in each way signal be:
d ( k ) = Σ m = 0 ∞ Σ n = 0 ∞ D m n 2 m / 2 ψ ( 2 k m - n )
Wherein, d (k) is the subsignal after the modulation of kth road, k ∈ [1, N],For N way signal,For small echo Function.
It is also preferred that the left described, described complex signal is modulated to real number signal, including:
Described complex signal is carried out mirror image processing；
Signal after mirror image processing is carried out Fast Fourier Transform Inverse, obtains real number signal.
For reaching above-mentioned purpose, the embodiment of the invention discloses a kind of signal demodulating method, method includes:
Carry out the real number signal after ovennodulation received demodulating for the first time, obtain a road complex signal；
Described complex signal is carried out serial to parallel conversion, obtains N way signal；
For each way signal in described N way signal, utilize the filter for modulation based on wavelet analysis technology The conjugate filter group of ripple device group, carries out second time and demodulates, and obtains the subsignal after the demodulation of N road；
Subsignal after demodulating described N road carries out parallel serial conversion, obtains the signal after a road demodulation；
Utilize the demodulation techniques corresponding with modulation technique, the signal after a described road demodulation is demodulated into primary signal.
It is also preferred that the left described being carried out by the real number signal after ovennodulation received demodulates for the first time, obtain a road plural number Signal, including:
Described real number signal is carried out fast Fourier transform, obtains complex signal；
Described complex signal is carried out anti-mirror image processing, obtains a road complex signal.
It is also preferred that the left described for each way signal in described N way signal, utilize use based on wavelet analysis technology In the conjugate filter group of the bank of filters of modulation, carry out second time and demodulate, obtain the subsignal after the demodulation of N road, including:
For each way signal in described N way signal, utilize wavelet analysis technology, described subsignal is separated into High-frequency signal and low frequency signal；
The inverse process carrying out described high-frequency signal up-sampling processes, the high-frequency signal after being processed；
Utilize the conjugate filter matched with high pass filter that the high-frequency signal after described process is processed, obtain Subsignal after demodulation.
It is also preferred that the left the signal after a described road demodulation is:
D m n = Σ k = 0 N - 1 d ( k ) 2 m / 2 ψ ( 2 k m - n )
Wherein,Being the signal after a road demodulation, d (k) is the subsignal after the demodulation of kth road, k ∈ [1, N],For wavelet function.
It is also preferred that the left described modulation technique, the one including in following modulation technique:
Quadrature amplitude modulation technology, amplitude-shift keying modulation technique, shift keying modulation technology or PSK Modulation Technology.
For reaching above-mentioned purpose, the embodiment of the invention discloses a kind of modulating apparatus, device includes:
First modulation module, is used for utilizing default modulation technique, carries out signal to be transmitted modulating for the first time；
First serial to parallel conversion module, for the signal after modulation for the first time is carried out serial to parallel conversion, obtains N way signal；
Second modulation module, for for each way signal in described N way signal, utilizes based on wavelet analysis skill The bank of filters of art, carries out second time and modulates, and obtains the subsignal after the modulation of N road；
First parallel serial conversion module, the subsignal after modulating described N road carries out parallel serial conversion, obtains a road plural number Signal；
3rd modulation module, for being modulated to real number signal by described complex signal.
It is also preferred that the left described default modulation technique, the one including in following modulation technique:
Quadrature amplitude modulation technology, amplitude-shift keying modulation technique, shift keying modulation technology or PSK Modulation Technology.
It is also preferred that the left described first modulation module, specifically for:
Utilize and preset modulation technique, signal to be transmitted is carried out multi-standard modulation.
It is also preferred that the left described second modulation module, specifically for:
For each way signal, described subsignal is up-sampled, the subsignal after being up-sampled；
Subsignal after described up-sampling is processed by the high pass filter utilizing described bank of filters to comprise, and obtains height Frequently signal；
Subsignal length before utilizing the low pass filter pair that described bank of filters comprises to up-sample with this road identical zero Sequence signal processes, and obtains low frequency signal；
Utilize wavelet analysis technology, synthesize described high-frequency signal and described low frequency signal, the subsignal after being modulated.
It is also preferred that the left described N road modulation after subsignal in each way signal be:
d ( k ) = Σ m = 0 ∞ Σ n = 0 ∞ D m n 2 m / 2 ψ ( 2 k m - n )
Wherein, d (k) is the subsignal after the modulation of kth road, k ∈ [1, N],For N way signal,For small echo Function.
It is also preferred that the left described 3rd modulation module, specifically for:
Described complex signal is carried out mirror image processing；
Signal after mirror image processing is carried out Fast Fourier Transform Inverse, obtains real number signal.
For reaching above-mentioned purpose, the embodiment of the invention discloses a kind of signal demodulating equipment, device includes:
First demodulation module, demodulates for the real number signal after ovennodulation received carries out first time, obtains one Road complex signal；
Second serial to parallel conversion module, for described complex signal is carried out serial to parallel conversion, obtains N way signal；
Second demodulation module, for for each way signal in described N way signal, utilizes based on wavelet analysis skill The conjugate filter group of the bank of filters for modulation of art, carries out second time and demodulates, and obtains the subsignal after the demodulation of N road；
Second parallel serial conversion module, the subsignal after demodulating described N road carries out parallel serial conversion, obtains a road demodulation After signal；
3rd demodulation module, for utilizing the demodulation techniques corresponding with modulation technique, by the signal after a described road demodulation It is demodulated into primary signal.
It is also preferred that the left described first demodulation module, specifically for:
Described real number signal is carried out fast Fourier transform, obtains complex signal；
Described complex signal is carried out anti-mirror image processing, obtains a road complex signal.
It is also preferred that the left described second demodulation module, specifically for:
For each way signal in described N way signal, utilize wavelet analysis technology, described subsignal is separated into High-frequency signal and low frequency signal；
The inverse process carrying out described high-frequency signal up-sampling processes, the high-frequency signal after being processed；
Utilize the conjugate filter matched with high pass filter that the high-frequency signal after described process is processed, obtain Subsignal after demodulation.
It is also preferred that the left the signal after a described road demodulation is:
D m n = Σ k = 0 N - 1 d ( k ) 2 m / 2 ψ ( 2 k m - n )
Wherein,Being the signal after a road demodulation, d (k) is the subsignal after the demodulation of kth road, k ∈ [1, N],For wavelet function.
It is also preferred that the left described modulation technique, the one including in following modulation technique:
Quadrature amplitude modulation technology, amplitude-shift keying modulation technique, shift keying modulation technology or PSK Modulation Technology.
As seen from the above technical solutions, a kind of signal modulation, demodulation method and device, profit are embodiments provided Use default modulation technique, carry out signal to be transmitted modulating for the first time；Signal after modulation for the first time is carried out serial to parallel conversion, To N way signal；For each way signal in described N way signal, utilize bank of filters based on wavelet analysis technology, Carry out second time to modulate, obtain the subsignal after the modulation of N road；Subsignal after modulating described N road carries out parallel serial conversion, obtains One road complex signal；Described complex signal is modulated to real number signal.
Visible, utilize wavelet analysis technology, replace IFFT and the FFT process in tradition OFDM optical communication system, utilize little Wave analysis is to intersymbol interference and the good resistance of inter-sub-carrier interference, it is not necessary to adds guard time and Cyclic Prefix, also can Enough suppression intersymbol interference and inter-sub-carrier interference well, and comprise useless letter owing to need not transmission in guard time The cyclic extensions signal of breath, thus improve the availability of frequency spectrum of OFDM optical communication system.
Certainly, arbitrary product or the method for implementing the present invention must be not necessarily required to reach all the above excellent simultaneously Point.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing In having technology to describe, the required accompanying drawing used is briefly described, it should be apparent that, the accompanying drawing in describing below is only this Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to Other accompanying drawing is obtained according to these accompanying drawings.
The schematic flow sheet of a kind of signal modulating method that Fig. 1 provides for the embodiment of the present invention；
The schematic flow sheet of a kind of signal demodulating method that Fig. 2 provides for the embodiment of the present invention；
The structural representation of a kind of modulating apparatus that Fig. 3 provides for the embodiment of the present invention；
The structural representation of a kind of signal demodulating equipment that Fig. 4 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under not making creative work premise Embodiment, broadly falls into the scope of protection of the invention.
A kind of signal modulating method provided the embodiment of the present invention first below enters to describe in detail.
See the schematic flow sheet of a kind of signal modulating method that Fig. 1, Fig. 1 provide for the embodiment of the present invention, can include Following steps:
S101, utilizes and presets modulation technique, carries out signal to be transmitted modulating for the first time；
Concrete, preset modulation technique, can include the one in following modulation technique: quadrature amplitude modulation technology (QAM Modulation), amplitude-shift keying modulation technique (ASK modulation), shift keying modulation technology (FSK modulation) or PSK Modulation Technology (PSK modulation).
Concrete, it is possible to use preset modulation technique, signal to be transmitted is carried out multi-standard modulation.Wherein, multi-standard is adjusted System can be: octal system quadrature amplitude modulation (8QAM modulation), hexadecimal quadrature Modulation and Amplitude Modulation (16QAM modulation), 64 Ary quadrature Modulation and Amplitude Modulation (64QAM modulation) etc.；Binary system amplitude-shift keying modulation (2ASK modulation), M-ary digital modulation (MASK modulation) etc.；Binary Frequency Shift Keying modulation (2FSK modulation), multi system frequency shift key control modulation (MFSK modulation) etc.； Binary phase shift keying modulation (2PSK modulation), QPSK modulation (QPSK modulation), multiple phase-shift keying modulation (MPSK modulation) etc..
Exemplary, signal to be transmitted can be binary system original data signal, and binary system original data signal is divided into 3 Individual part, carries out 8QAM modulation, 16QAM modulation and 64QAM modulation respectively, thus signal to be transmitted has carried out the most systems Formula is modulated.
S102, carries out serial to parallel conversion to the signal after modulation for the first time, obtains N way signal；
Concrete, serial to parallel conversion refers to the continuous signal metasequence to be for conversion into and represents that a group of identical information is corresponding The process of the parallel signal element occurred.Serioparallel exchange is typically realized by hardware description language, by a flow of information (if having If 8bits) being divided into two paths of signals, two-way transmits simultaneously, and the time is exactly the half of the original time.Serial to parallel conversion is existing skill Art, it is not repeated by the embodiment of the present invention at this.
Exemplary, the signal after first time multi-standard QAM modulation can be carried out serial to parallel conversion, obtain 32 tunnels parallel Subsignal.
S103, for each way signal in described N way signal, utilizes wave filter based on wavelet analysis technology Group, carries out second time and modulates, and obtains the subsignal after the modulation of N road；
Concrete, described subsignal can be up-sampled for each way signal in N way signal, obtains Subsignal after up-sampling；Utilize high pass filter that described bank of filters comprises to the subsignal after described up-sampling at Reason, obtains high-frequency signal；Subsignal length before utilizing the low pass filter pair that described bank of filters comprises to up-sample with this road Identical null sequence signal processes, and obtains low frequency signal；Utilize wavelet analysis technology, synthesize described high-frequency signal and described Low frequency signal, the subsignal after being modulated.
Exemplary, for each way signal in the 32 parallel subsignals in tunnel, each branch road is up-sampled, sampling Speed can be 2 power side's (speed is as the criterion to realize up-sampling), the subsignal (signal length after being up-sampled There occurs change)；Utilize the high pass filter that bank of filters comprises, the subsignal after up-sampling is processed, i.e. allow it lead to Cross high pass filter, obtain high-frequency signal；Utilize the low pass filter that bank of filters comprises, to the son letter before up-sampling with this road Number null sequence signal that length is identical processes, and i.e. allows it pass through low pass filter, obtains low frequency signal；Utilize wavelet analysis Technology, synthesizes new detail signal by high-frequency signal and low frequency signal, can be referred to as filter bankmodulation signal and (i.e. modulate After subsignal).Wherein, wavelet analysis technology is prior art, and it is not repeated by the embodiment of the present invention at this.
Concrete, each way signal in subsignal after the modulation of N road can be:
d ( k ) = Σ m = 0 ∞ Σ n = 0 ∞ D m n 2 m / 2 ψ ( 2 k m - n )
Wherein, d (k) is the subsignal after the modulation of kth road, k ∈ [1, N],For N way signal (i.e. wavelet coefficient),For wavelet function.
S104, the subsignal after modulating described N road carries out parallel serial conversion, obtains a road complex signal；
Concrete, parallel serial conversion refers to that the signal element that a group is occurred parallel is for conversion into the phase representing identical information The process of the continuous signal metasequence answered.Serial to parallel conversion is prior art, and it is not repeated by the embodiment of the present invention at this.
Exemplary, in actual applications, the subsignal after 32 tunnel modulation can be carried out parallel serial conversion, obtaining a road is The complex signal being made up of real part and imaginary part, it is also possible to referred to as multi-subcarrier signal.
S105, is modulated to real number signal by described complex signal.
Concrete, in actual applications, directly modulation can be used, described complex signal is carried out mirror image processing；By mirror As the signal after processing carries out Fast Fourier Transform Inverse, obtain real number signal (real number multi-subcarrier signal).Wherein, to plural number Signal carries out mirror image processing, can by double for the data length of signal, double after the first half data of signal data be former letter Number, later half data are the complex conjugate of original signal data.
Concrete, in actual applications, it is also possible to real number multi-subcarrier digital signal is carried out digital-to-analogue conversion, obtain the most sub Carrier wave analogue signal, by directly modulation laser instrument by multi-subcarrier analogue signal directly modulation to light carrier, obtain light many Subcarrier analogue signal.The light multi-subcarrier analogue signal obtained can be transmitted by optical fiber link, then by photodetection Device receives, and light multi-subcarrier analogue signal is converted to corresponding electricity multi-subcarrier analogue signal.Finally by how sub-for electricity load Wave simulation signal carries out analog digital conversion, obtains corresponding electricity multi-subcarrier digital signal, and it is real number signal.
Visible, utilize wavelet analysis technology, replace IFFT and the FFT process in tradition OFDM optical communication system, utilize little Wave analysis is to intersymbol interference and the good resistance of inter-sub-carrier interference, it is not necessary to adds guard time and Cyclic Prefix, also can Enough suppression intersymbol interference and inter-sub-carrier interference well, and comprise useless letter owing to need not transmission in guard time The cyclic extensions signal of breath, thus improve the availability of frequency spectrum of OFDM optical communication system.
See the schematic flow sheet of a kind of signal demodulating method that Fig. 2, Fig. 2 provide for the embodiment of the present invention, can include Following steps:
S201, carries out the real number signal after ovennodulation received demodulating for the first time, obtains a road complex signal；
Concrete, described real number signal can be carried out fast Fourier transform, obtain complex signal；By described plural number letter Number carry out anti-mirror image processing, obtain a road complex signal.Wherein, this complex signal is carried out anti-mirror image processing, directly take this multiple The first half data of number signal data.
S202, carries out serial to parallel conversion to described complex signal, obtains N way signal；
Concrete, serial to parallel conversion refers to the continuous signal metasequence to be for conversion into and represents that a group of identical information is corresponding The process of the parallel signal element occurred.Serioparallel exchange is typically realized by hardware description language, by a flow of information (if having If 8bits) being divided into two paths of signals, two-way transmits simultaneously, and the time is exactly the half of the original time.Serial to parallel conversion is existing skill Art, it is not repeated by the embodiment of the present invention at this.
Exemplary, this complex signal can be carried out serial to parallel conversion, obtain the subsignal that 32 tunnels are parallel.
S203, for each way signal in described N way signal, utilizes based on wavelet analysis technology being used for modulate The conjugate filter group of bank of filters, carry out second time and demodulate, obtain the subsignal after the demodulation of N road；
Concrete, wavelet analysis technology can be utilized, by described for each way signal in described N way signal Subsignal is separated into high-frequency signal and low frequency signal；The inverse process carrying out described high-frequency signal up-sampling processes, and is processed After high-frequency signal；Utilize and the conjugate filter that matches of high pass filter to the high-frequency signal after described process at Reason, the subsignal after being demodulated.
Exemplary, wavelet analysis technology can be utilized, by this way for each way signal in 32 way signals Signal separator is high-frequency signal and low frequency signal；The inverse process carrying out high-frequency signal up-sampling processes, the height after being processed Frequently signal；Utilize the conjugate filter matched with high pass filter that the high-frequency signal after processing is processed, i.e. allow it lead to Cross the conjugate filter matched with high pass filter, the subsignal after being demodulated.In actual applications, it is possible to use with low Low frequency signal is processed by the conjugate filter that bandpass filter matches, i.e. allow its by with being total to that low pass filter matches Yoke wave filter, obtains null sequence signal, and owing to null sequence serial number comprises the signal of garbage, can abandon need not.
S204, the subsignal after demodulating described N road carries out parallel serial conversion, obtains the signal after a road demodulation；
Concrete, the signal after a road demodulation can be:
D m n = Σ k = 0 N - 1 d ( k ) 2 m / 2 ψ ( 2 k m - n )
Wherein,Being the signal after a road demodulation, d (k) is the subsignal after the demodulation of kth road, k ∈ [1, N],For wavelet function.
Concrete, parallel serial conversion refers to that the signal element that a group is occurred parallel is for conversion into the phase representing identical information The process of the continuous signal metasequence answered.Serial to parallel conversion is prior art, and it is not repeated by the embodiment of the present invention at this.
Exemplary, the subsignal after 32 tunnel demodulation is carried out parallel serial conversion, obtains the signal after a road demodulation.
S205, utilizes the demodulation techniques corresponding with modulation technique, and the signal after a described road demodulation is demodulated into original letter Number.
Concrete, described modulation technique, the one including in following modulation technique: quadrature amplitude modulation technology, amplitude key Control modulation technique, shift keying modulation technology or PSK Modulation Technology.Such as, corresponding the demodulating for QAM of QAM modulation technology Technology, ASK modulation technique corresponding for coherent demodulation technology, non-coherent demodulation technology, corresponding the solving for relevant of FSK modulation technology Conditioning technology, non-coherent demodulation technology, PSK modulation technique corresponding for coherent demodulation technology.
Exemplary, it is possible to use QAM demodulation techniques, the signal after a road demodulation is demodulated into binary system original number and it is believed that Number.
Visible, utilize wavelet analysis technology, replace IFFT and the FFT process in tradition OFDM optical communication system, utilize little Wave analysis is to intersymbol interference and the good resistance of inter-sub-carrier interference, it is not necessary to adds guard time and Cyclic Prefix, also can Enough suppression intersymbol interference and inter-sub-carrier interference well, and comprise useless letter owing to need not transmission in guard time The cyclic extensions signal of breath, thus improve the availability of frequency spectrum of OFDM optical communication system.
See the structural representation of a kind of modulating apparatus that Fig. 3, Fig. 3 provide for the embodiment of the present invention, shown in Fig. 1 Flow process corresponding, this modulating device may include that first modulation module the 301, first serial to parallel conversion module 302, second is modulated Module the 303, first parallel serial conversion module the 304, the 3rd modulation module 305.
First modulation module 301, is used for utilizing default modulation technique, carries out signal to be transmitted modulating for the first time；
Concrete, the first modulation module 301, specifically may be used for:
Utilize and preset modulation technique, signal to be transmitted is carried out multi-standard modulation.
First serial to parallel conversion module 302, for the signal after modulation for the first time is carried out serial to parallel conversion, obtains N way letter Number；
Second modulation module 303, for for each way signal in described N way signal, utilizes based on little wavelength-division The bank of filters of analysis technology, carries out second time and modulates, and obtains the subsignal after the modulation of N road；
Have, the second modulation module 303, specifically may be used for:
For each way signal, described subsignal is up-sampled, the subsignal after being up-sampled；
Subsignal after described up-sampling is processed by the high pass filter utilizing described bank of filters to comprise, and obtains height Frequently signal；
Subsignal length before utilizing the low pass filter pair that described bank of filters comprises to up-sample with this road identical zero Sequence signal processes, and obtains low frequency signal；
Utilize wavelet analysis technology, synthesize described high-frequency signal and described low frequency signal, the subsignal after being modulated.
Concrete, each way signal in subsignal after the modulation of described N road can be:
d ( k ) = Σ m = 0 ∞ Σ n = 0 ∞ D m n 2 m / 2 ψ ( 2 k m - n )
Wherein, d (k) is the subsignal after the modulation of kth road, k ∈ [1, N],For N way signal,For small echo Function.
First parallel serial conversion module 304, the subsignal after modulating described N road carries out parallel serial conversion, obtains a road Complex signal；
3rd modulation module 305, for being modulated to real number signal by described complex signal.
Concrete, the 3rd modulation module 305, specifically may be used for:
Described complex signal is carried out mirror image processing；
Signal after mirror image processing is carried out Fast Fourier Transform Inverse, obtains real number signal.
Visible, utilize wavelet analysis technology, replace IFFT and the FFT process in tradition OFDM optical communication system, utilize little Wave analysis is to intersymbol interference and the good resistance of inter-sub-carrier interference, it is not necessary to adds guard time and Cyclic Prefix, also can Enough suppression intersymbol interference and inter-sub-carrier interference well, and comprise useless letter owing to need not transmission in guard time The cyclic extensions signal of breath, thus improve the availability of frequency spectrum of OFDM optical communication system.
See the structural representation of a kind of signal demodulating equipment that Fig. 4, Fig. 4 provide for the embodiment of the present invention, shown in Fig. 2 Flow process corresponding, this demodulating equipment may include that first demodulation module the 401, second serial to parallel conversion module 402, second demodulates Module the 403, second parallel serial conversion module the 404, the 3rd demodulation module 405.
First demodulation module 401, demodulates for the real number signal after ovennodulation received carries out first time, obtains One road complex signal；
Concrete, the first demodulation module 401, specifically may be used for:
Described real number signal is carried out fast Fourier transform, obtains complex signal；
Described complex signal is carried out anti-mirror image processing, obtains a road complex signal.
Second serial to parallel conversion module 402, for described complex signal is carried out serial to parallel conversion, obtains N way signal；
Second demodulation module 403, for for each way signal in described N way signal, utilizes based on little wavelength-division The conjugate filter group of the bank of filters for modulation of analysis technology, carries out second time and demodulates, and obtains the son letter after the demodulation of N road Number；
Concrete, the second demodulation module 403, specifically may be used for:
For each way signal in described N way signal, utilize wavelet analysis technology, described subsignal is separated into High-frequency signal and low frequency signal；
The inverse process carrying out described high-frequency signal up-sampling processes, the high-frequency signal after being processed；
Utilize the conjugate filter matched with high pass filter that the high-frequency signal after described process is processed, obtain Subsignal after demodulation.
Second parallel serial conversion module 404, the subsignal after demodulating described N road carries out parallel serial conversion, obtains a road Signal after demodulation；
Concrete, the signal after a described road demodulation can be:
D m n = Σ k = 0 N - 1 d ( k ) 2 m / 2 ψ ( 2 k m - n )
Wherein,Being the signal after a road demodulation, d (k) is the subsignal after the demodulation of kth road, k ∈ [1, N],For wavelet function.
3rd demodulation module 405, for utilizing the demodulation techniques corresponding with modulation technique, by the letter after a described road demodulation Number it is demodulated into primary signal.
Concrete, described modulation technique, can include the one in following modulation technique:
Quadrature amplitude modulation technology, amplitude-shift keying modulation technique, shift keying modulation technology or PSK Modulation Technology.
Visible, utilize wavelet analysis technology, replace IFFT and the FFT process in tradition OFDM optical communication system, utilize little Wave analysis is to intersymbol interference and the good resistance of inter-sub-carrier interference, it is not necessary to adds guard time and Cyclic Prefix, also can Enough suppression intersymbol interference and inter-sub-carrier interference well, and comprise useless letter owing to need not transmission in guard time The cyclic extensions signal of breath, thus improve the availability of frequency spectrum of OFDM optical communication system.
It should be noted that in this article, the relational terms of such as first and second or the like is used merely to a reality Body or operation separate with another entity or operating space, and deposit between not necessarily requiring or imply these entities or operating Relation or order in any this reality.And, term " includes ", " comprising " or its any other variant are intended to Comprising of nonexcludability, so that include that the process of a series of key element, method, article or equipment not only include that those are wanted Element, but also include other key elements being not expressly set out, or also include for this process, method, article or equipment Intrinsic key element.In the case of there is no more restriction, statement " including ... " key element limited, it is not excluded that Including process, method, article or the equipment of described key element there is also other identical element.
Each embodiment in this specification all uses relevant mode to describe, identical similar portion between each embodiment Dividing and see mutually, what each embodiment stressed is the difference with other embodiments.Real especially for device For executing example, owing to it is substantially similar to embodiment of the method, so describe is fairly simple, relevant part sees embodiment of the method Part illustrate.
One of ordinary skill in the art will appreciate that all or part of step realizing in said method embodiment is can Completing instructing relevant hardware by program, described program can be stored in computer read/write memory medium, The storage medium obtained designated herein, such as: ROM/RAM, magnetic disc, CD etc..
The foregoing is only presently preferred embodiments of the present invention, be not intended to limit protection scope of the present invention.All Any modification, equivalent substitution and improvement etc. made within the spirit and principles in the present invention, are all contained in protection scope of the present invention In.

Claims (9)

1. a signal modulating method, it is characterised in that described method includes:
Utilize and preset modulation technique, carry out signal to be transmitted modulating for the first time；
Signal after modulation for the first time is carried out serial to parallel conversion, obtains N way signal；
For each way signal in described N way signal, utilize bank of filters based on wavelet analysis technology, carry out second Secondary modulation, obtains the subsignal after the modulation of N road；
Subsignal after modulating described N road carries out parallel serial conversion, obtains a road complex signal；
Described complex signal is modulated to real number signal.
Method the most according to claim 1, it is characterised in that described default modulation technique, including in following modulation technique One:
Quadrature amplitude modulation technology, amplitude-shift keying modulation technique, shift keying modulation technology or PSK Modulation Technology.
Method the most according to claim 2, it is characterised in that modulation technique is preset in described utilization, enters signal to be transmitted Row modulation for the first time, including:
Utilize and preset modulation technique, signal to be transmitted is carried out multi-standard modulation.
Method the most according to claim 1, it is characterised in that described for each way letter in described N way signal Number, utilize bank of filters based on wavelet analysis technology, carry out second time and modulate, obtain the subsignal after the modulation of N road, including:
For each way signal, described subsignal is up-sampled, the subsignal after being up-sampled；
Subsignal after described up-sampling is processed by the high pass filter utilizing described bank of filters to comprise, and obtains high frequency letter Number；
The null sequence that subsignal length before utilizing the low pass filter pair that described bank of filters comprises to up-sample with this road is identical Signal processes, and obtains low frequency signal；
Utilize wavelet analysis technology, synthesize described high-frequency signal and described low frequency signal, the subsignal after being modulated.
Method the most according to claim 1, it is characterised in that each way letter in the subsignal after the modulation of described N road Number be:
d ( k ) = Σ m = 0 ∞ Σ n = 0 ∞ D m n 2 m / 2 ψ ( 2 k m - n )
Wherein, d (k) is the subsignal after the modulation of kth road, k ∈ [1, N],For N way signal,For wavelet function.
Method the most according to claim 1, it is characterised in that described described complex signal is modulated to real number signal, bag Include:
Described complex signal is carried out mirror image processing；
Signal after mirror image processing is carried out Fast Fourier Transform Inverse, obtains real number signal.
7. a signal demodulating method, it is characterised in that described method includes:
Carry out the real number signal after ovennodulation received demodulating for the first time, obtain a road complex signal；
Described complex signal is carried out serial to parallel conversion, obtains N way signal；
For each way signal in described N way signal, utilize the wave filter for modulation based on wavelet analysis technology The conjugate filter group of group, carries out second time and demodulates, and obtains the subsignal after the demodulation of N road；
Subsignal after demodulating described N road carries out parallel serial conversion, obtains the signal after a road demodulation；
Utilize the demodulation techniques corresponding with modulation technique, the signal after a described road demodulation is demodulated into primary signal.
8. a modulating apparatus, it is characterised in that described device includes:
First modulation module, is used for utilizing default modulation technique, carries out signal to be transmitted modulating for the first time；
First serial to parallel conversion module, for the signal after modulation for the first time is carried out serial to parallel conversion, obtains N way signal；
Second modulation module, for for each way signal in described N way signal, utilizes based on wavelet analysis technology Bank of filters, carries out second time and modulates, and obtains the subsignal after the modulation of N road；
First parallel serial conversion module, the subsignal after modulating described N road carries out parallel serial conversion, obtains a road plural number letter Number；
3rd modulation module, for being modulated to real number signal by described complex signal.
9. a signal demodulating equipment, it is characterised in that described device includes:
First demodulation module, demodulates for the real number signal after ovennodulation received carries out first time, obtains a road multiple Number signal；
Second serial to parallel conversion module, for described complex signal is carried out serial to parallel conversion, obtains N way signal；
Second demodulation module, for for each way signal in described N way signal, utilizes based on wavelet analysis technology For the conjugate filter group of the bank of filters of modulation, carry out second time and demodulate, obtain the subsignal after the demodulation of N road；
Second parallel serial conversion module, the subsignal after demodulating described N road carries out parallel serial conversion, after obtaining a road demodulation Signal；
3rd demodulation module, for utilizing the demodulation techniques corresponding with modulation technique, by the signal demodulation after a described road demodulation For primary signal.
CN201610730699.6A 2016-08-26 2016-08-26 A kind of signal modulation, demodulation method and device Pending CN106302294A (en)

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