CN106301572B - Low spending channel estimation methods and application system for light FBMC Transmission system - Google Patents

Low spending channel estimation methods and application system for light FBMC Transmission system Download PDF

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CN106301572B
CN106301572B CN201610642983.8A CN201610642983A CN106301572B CN 106301572 B CN106301572 B CN 106301572B CN 201610642983 A CN201610642983 A CN 201610642983A CN 106301572 B CN106301572 B CN 106301572B
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module
fbmc
signal
pilot
light
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CN106301572A (en
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毕美华
张鹿
张阔
李隆胜
郭梓栋
缪馨
胡卫生
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Shanghai Jiaotong University
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Shanghai Jiaotong University
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    • 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
    • H04B10/2589—Bidirectional transmission
    • 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
    • H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
    • 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
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/67—Optical arrangements in the receiver
    • H04B10/671—Optical arrangements in the receiver for controlling the input optical signal
    • H04B10/672—Optical arrangements in the receiver for controlling the input optical signal for controlling the power of the input optical signal
    • 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
    • H04B10/60—Receivers
    • H04B10/66—Non-coherent receivers, e.g. using direct detection
    • H04B10/69—Electrical arrangements in the receiver
    • H04B10/691—Arrangements for optimizing the photodetector in the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/0202—Channel estimation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Power Engineering (AREA)
  • Optical Communication System (AREA)

Abstract

The present invention provides a kind of low spending channel estimation methods and application system for light FBMC Transmission system, it include: the inserted mode for being primarily based on Comb Pilot, by obtaining pilot tone initial channel estimation based on Zero-forcing method, the pilot channel of estimation is first passed through average, then the data channel characteristic for carrying out linear interpolation in frequency domain, and then being estimated.The present invention solves the problems, such as that processing sub-carrier orthogonality destroys bring intersymbol interference, inter-sub-carrier interference, system device bring random distribution Gaussian noise etc. and the receiving sensitivity of system is caused to decline.Meanwhile can be paid wages with the reduction pilot tone of high degree, thus can be by the optical transmission system based on wave filter group of the following high speed.

Description

Low spending channel estimation methods and application system for light FBMC Transmission system
Technical field
The present invention relates to optical transport technology fields, and in particular, to a kind of low spending letter for light FBMC Transmission system Channel estimation method and application system.
Background technique
It shows two apparent development with the continuous improvement to communicating requirement, optic communication with the development of communication technology and becomes Gesture: the data rate of single channel transmission greatly increases, and levels off to 100Gb/s；Network must have cracking dynamic adjustment capability. But when data rate reaches 100Gb/s, traditional fiber segment compensation becomes costly and time consuming, very to the compensation of system dispersion Difficult accurate realization, and it is based on filter bank multi-carrier modulation technique (Filter Bank based Multicarrier, FBMC), Because having, side mode suppression ratio is high, support asynchronous transmission, high spectrum efficiency, can make full use of the uniquenesses such as Digital Signal Processing Advantage is widely used in optical communication system in recent years.FBMC can be in the OFDM multi-carrier of preferable inheriting tradition Spectrum efficiency height, the resisting chromatic dispersion of modulation technique (Orthogonal frequency-division multiplexing, OFDM) On the basis of the advantages that ability is strong, flexible bandwidth allocation, not only reduces OFDM and time domain and frequency domain stringent synchronization are wanted It asks, to intersymbol interference (Inter Symbol Interference, ISI) and inter-sub-carrier interference (Inter carrier Interference, ICI) there are good robustness and slackness, reduce requirement of the system to the photoelectric device linearity.Together When, the filtering characteristic of sub-carrier grade can be used in FBMC, and can be constructed with the channel spacing of very little has the " super of spectral efficient Grade channel (Super-channel) ", " seamless " merges the signal band from each user in turn.In systems in practice, due to When multi-carrier signal is transmitted in a fiber, itself nonlinear characteristic of optical fiber dispersive influence itself and photoelectric device will receive Influence, be destroyed signal in orthogonal, to reduce the quality of signal.Therefore, in the optical transport based on multi-carrier modulation In system, effective signal estimation method is needed to promote the quality of receiving end signal.
In order to effectively antagonize influence of the ISI to signal quality, traditional light ofdm signal passes through in transmitting terminal cyclic prefix (Cyclic Prefix, CP), can compensate dispersion bring ISI.Thus, remove CP in receiving end, generally utilizes simple LS (Least Square) least square method, then in the response that can compensate channel using zero forcing equalizer.However, being different from passing System light ofdm signal, light FBMC signal substitutes CP with filtering group, and its orthogonality condition needs are realized in real number field.Cause And ofdm signal is compared, the signal on each subcarrier in each symbol is not only by other symbols but also by identical symbol Signaling point interference in different sub-carrier in number.In addition, FBMC signal is by dispersion shadow when transmitting in fiber-optic signal It rings, it will destroy the orthogonality of its FBMC.Therefore, the channel estimated using the channel estimation method of common ofdm signal is special Property be superimposed with what surrounding point interfered for channel true value, more cannot really restore the true characteristic of channel, to a certain extent The quality for reducing signal, because the channel estimation methods of normal light OFDM are not directly applicable light FBMC Transmission system.
It is found through being retrieved to existing literature, wireless communication system is mainly eliminated from interference at present and interference utilizes the two think ofs FBMC pilot tone is studied on road, proposes corresponding pilot configuration.Such as S.Kang, K.Chang are equal to the " A delivered in 2007 Novel channel estimation scheme for OFDM/OQAM-IOTA system " consider neighborhood influence, pass through Some time-frequency lattice points are reserved, to offset internal ISI interference, so that all periphery time-frequency lattice points are to total interference of pilot tone Zero, but since this method needs to calculate total interference of other data points to pilot tone, thus calculation amount is larger, real-time also compared with Difference.For another example J.Du, which is equal to 2009, delivers " Novel Preamble-Based Channel Estimation for OFDM/ OQAM System ", propose IAM " puppet " pilot configuration utilized based on interference, it passes through the time frequency point determined around pilot tone, meter Known ISI interference volume is calculated, and is used in channel estimation, this method can preferably estimate the response bag of complex channel Network.In optical transmission system, the bandwidth of light FBMC signal will be significantly larger than the transmission signal in wireless, since it is desired that comparatively Simply, the channel estimation methods based on pilot tone being easily achieved.For this purpose, our (optics on 2016 time Communication Magazines Communication a kind of channel estimation methods based on Block-type pilot average algorithm) are proposed, this method can be preferable gram Take the influence of the nonlinearity of the photoelectric device of the interference of adjacent-channel signals and optical transmission system and bring gaussian additive noise.So And this method, it needs the pilot tone greater than 5% to pay wages, the spectrum efficiency of system will be reduced to a certain extent.
Summary of the invention
For the defects in the prior art, the object of the present invention is to provide a kind of low spendings for light FBMC Transmission system Channel estimation methods and application system.
The low spending channel estimation methods for light FBMC Transmission system provided according to the present invention, include the following steps:
Step 1: being inserted into pilot frequency information in the electric FBMC signal of generation, and the electric FBMC signal comprising pilot frequency information is turned Change light FBMC signal into；
Step 2: light FBMC signal is transmitted through the fiber to receiving end, and the light that will be received using photodetector FBMC signal is converted into electric FBMC signal；
Step 3: electric FBMC signal being demodulated, corresponding pilot frequency information is therefrom extracted；
Step 4: the average frequency response of pilot sub-carrier is estimated using the LS estimation method of average；
Step 5: the frequency response of data subcarrier in channel is estimated using linear interpolation method.
Preferably, the step 1 includes: the having in the FBMC signal of every frame in the L frame FBMC signal process of generation In the frequency band for imitating subcarrier, it is inserted into a pilot frequency information every T subcarrier, the pilot frequency information is the number after symbol maps According to the pilot frequency information and effective subcarrier data by symbol mapping enter IFFT together and ultimately generate electric FBMC signal； The FBMC signal is connected to optical modulator, to generate the light FBMC signal comprising pilot frequency information.
Preferably, IFFT described in step 1, for by pilot frequency information and the valid data signal after symbol maps It carries out IFFT operation and obtains conversion signal to complete conversion of the signal from frequency domain to time domain.
Preferably, the photodetector in the step 2 includes: photodiode or avalanche diode；Optical fiber is single Mode fiber.
Preferably, the step 3 includes: that electric FBMC signal is realized FBMC by being transmitted to FFT module after serioparallel exchange Pilot frequency information in signal extracts；The FFT module is used for the FFT operation of signal, realizes conversion of the signal from frequency domain to time domain.
Preferably, the step 4 includes: the pilot frequency information for obtaining step 3, first passes through LS estimation, i.e. least square method The channel response of each pilot frequency locations is obtained, different frame being averaged at the same sub-carrier positions is realized based on the channel response Operation, realizes the estimated data of effective pilot channel.
Preferably, the step 5 includes: to be extended the channel evaluation data that effective pilot tone is obtained in step 4, i.e., in fact The extension of pilot channel estimation on existing L data frame；Channel data based on extension, two neighboring pilot tone in each frame Intercarrier carries out interpolation, realizes the channel characteristic estimation data of the valid data subcarrier data in each FBMC frame；Utilize this Estimated data realizes the compensation for receiving signal by zero forcing equalization method.
The application system of the low spending channel estimation methods for light FBMC Transmission system provided according to the present invention, packet Include: light FBMC transmitting module, FBMC receiving module and optical fiber, the smooth FBMC transmitting module is by the light comprising pilot frequency information FBMC signal is sent to FBMC receiving module by optical fiber, is converted light FBMC signal to accordingly by the FBMC receiving module Electric FBMC signal, and the pilot frequency information for including is extracted, obtain the estimated data and the valid data characteristic of channel of pilot frequency information Estimated data.
Preferably, the smooth FBMC transmitting module includes: optical modulator module, the electricity FBMC being made of laser and modulator Signal generation module；
The optical modulator module includes: laser and modulator, wherein the output end of electric FBMC signal generation module connects To the optical modulator driven by laser, the generation of light FBMC signal is realized；
The electricity FBMC signal generation module includes: digital signal module, the first S/P module, symbol mapping block, is based on The insertion module of Comb Pilot, IFFT module, first filter group, DAC module, P/S module, pilot signal generation module；Institute It states digital signal module and is connected to the first S/P module for realizing the serioparallel exchange of signal, the output of the first S/P module passes through symbol The signal extremely insertion module based on Comb Pilot after mapping, the output end and IFFT of the insertion module based on Comb Pilot Module is connected, and the signal comprising pilot frequency information is sent to first filter group by the IFFT module, first filter group it is defeated It is connected to P/S module out, the parallel-serial conversion of signal is completed by P/S module；The output signal of the P/S module enters DAC module, Electricity FBMC signal is exported by the DAC module.
Preferably, the FBMC receiving module includes: photodetector, ADC module, the 2nd S/P module, second filter Group, FFT module, pilot tone abstraction module, the estimation module for the interpolation that is first averaged, balance module, symbol de-maps module, 0,1 number According to output unit；
Wherein, the FBMC signal received is successively transmitted to ADC module, the 2nd S/P module by photodetector, and described Two S/P modules are connected to second filter group, and the output end of second filter group is connected to FFT module；The output of FFT module is believed Number by entering the estimation module of the interpolation that is first averaged after pilot tone abstraction module, channel estimation is realized；The balance module receives Signal after estimation realizes the compensation to FBMC signal is received；Compensated FBMC signal passes through symbol de-maps module, 0,1 It is exported after data outputting unit, realizes the reception of user data.
Compared with prior art, the present invention have it is following the utility model has the advantages that
1, the present invention is compared with traditional average algorithm based on Block-type pilot, under the spending of same pilot tone, calculation of the invention Method reduces the bit error rate, improves estimated accuracy.
2, the algorithm bit error rate of the invention is influenced small by pilot tone spending, i.e., also can guarantee low mistake using the spending of lesser pilot tone Code rate improves band efficiency.
3, the present invention is by the method for time domain average, and countermeasure system random distribution Gaussian noise influences well, makes to receive Data noise mean value levels off to zero.
Detailed description of the invention
Upon reading the detailed description of non-limiting embodiments with reference to the following drawings, other feature of the invention, Objects and advantages will become more apparent upon:
Fig. 1 is Comb Pilot insert structure schematic diagram.
Fig. 2 is the channel estimation methods schematic illustration for the optical transmission system modulated based on filter bank multi-carrier.
Fig. 3 is the schematic illustration of the channel estimation methods of the interpolation that is first averaged based on Comb Pilot；
Fig. 4 is the BER performance of optical transmission system modulate based on filter bank multi-carrier under the conditions of different channels are estimated Comparison diagram, in figure: horizontal axis is the optical power of receiving end, and the longitudinal axis is that BER indicates bit error rate size, and OH refers to that pilot tone is paid wages, IAFA For Block-type pilot average algorithm；CPFAL refers to the first average rear linear interpolation of Comb Pilot, is an example in the present invention；BP- FFT is Block-type pilot FFT interpolation；BPL is Block-type pilot linear interpolation.
Specific embodiment
The present invention is described in detail combined with specific embodiments below.Following embodiment will be helpful to the technology of this field Personnel further understand the present invention, but the invention is not limited in any way.It should be pointed out that the ordinary skill of this field For personnel, without departing from the inventive concept of the premise, several changes and improvements can also be made.These belong to the present invention Protection scope.
The low spending channel estimation methods for light FBMC Transmission system provided according to the present invention first use LS channel estimation The algorithm method of average estimates the frequency response of pilot sub-carrier, after on the basis of the frequency response of pilot sub-carrier by linear Interpolate estimation goes out the frequency response of data subcarrier；Specifically, comprising the following steps:
Step 1: the insertion of pilot signal, the generation comprising pilot tone FBMC data-signal, and electro-optic conversion is carried out, generate light FBMC signal；
Step 2: light FBMC signal is transmitted by optical fiber, reaches receiving end, completes turning for electricity FBMC by photodetector It changes；
Step 3: the demodulation of electric FBMC signal realizes the demodulation of pilot signal, and extracts the pilot frequency information in FBMC signal；
Step 4: the average frequency response of pilot sub-carrier is estimated using the LS estimation method of average；
Step 5: the frequency response of data subcarrier in channel is estimated using linear interpolation method.
Further, to hereafter need using term be first introduced:
1) Fourier's inversion of time-domain signal x (t) is arrived in, IFFT fast discrete inverse Fourier transform for frequency signal X (k) It changes, it may be assumed thatWherein N is sub-carrier number；
2), FFT is fast discrete Fourier transformation, and the Fourier transformation of frequency signal X (k) is arrived for time-domain signal x (t), That is:
3), S/P and P/S refers to for string and and parallel-serial conversion；
4), DAC, ADC are digital-to-analogue conversion and analog-to-digital conversion；
5), OH refers to that pilot tone is paid wages, and IAFA is Block-type pilot average algorithm；
6), CPFAL refers to the first average rear linear interpolation of Comb Pilot, and BP-FFT is Block-type pilot FFT interpolation；BPL is block Shape pilot linear interpolation；
7), LS refers to least square method.
The step 1 is in generating L frame FBMC data procedures, the frequency of effective subcarrier in the FBMC data of every frame In band, it is inserted into a pilot data every T subcarrier, being inserted into the pilot data is the data after symbol maps, and insertion is led The data of frequency and the effective subcarrier data for passing through symbol mapping enter IFFT, serioparallel exchange module and D/A converter module together Afterwards, electricity FBMC signal is generated；The FBMC signal is connected to optical modulator, to realize the generation of light FBMC signal.
FBMC data can be mapped based on transmission M-QAM symbol mapping, or based on M-Offfet-QAM symbol；
Optical modulator can be direct optical modulator, or (laser is as light for the external modulation module based on light carrier Carrier wave drives external modulator).
IFFT described in step 1, for carrying out the pilot tone and the valid data signal after symbol maps IFFT operation generates conversion signal from the conversion of frequency domain to time domain to complete signal.
The step 2 includes: that the light FBMC signal that step 1 exports is reached receiving end, optical fiber output by optical fiber transmission End is connected to photodetector, and photodetector exports electricity FBMC signal.
Photodetector includes: photodiode, or avalanche diode；Optical fiber is generally common single-mode optics It is fine.
The step 3 is the inverse process that the electric FBMC signal that step 2 is converted is generated by signal, first passes through serioparallel exchange, Then pass through FFT；Abstraction module after FFT output by pilot signal realizes that the pilot frequency information in FBMC signal extracts；
FFT in the step 3 realizes conversion of the signal from frequency domain to time domain for the FFT operation of signal.
The step 4 includes: the pilot frequency information for obtaining step 3, first passes through LS estimation module and obtains each pilot frequency locations Channel response, realize that different frame can be in the average operation at the same sub-carrier positions, thus real based on the channel response The now estimation of effective pilot channel.
LS estimation module in the step 4, for completing the first estimation of pilot signal channel.
The step 5 includes: that the channel evaluation data of effective pilot tone will be obtained in step 4, passes through the extension of channel data Module realizes the extension of the pilot channel estimation on L data frame；Based on spreading channel data, two neighboring in each frame is led Interpolation is carried out between frequency subcarrier, realizes the channel characteristic estimation of the valid data subcarrier data in each FBMC frame；Utilize this Estimated data realizes the compensation for receiving signal by zero forcing equalization method, in the demapping and number letter for further completing signal Number output.
Conversion module is received to include the serioparallel exchange module being sequentially connected, receive end filter group and FFT arithmetic element.
The present invention is based on Comb Pilot, channel estimation methods relate generally to the Transmit-Receive Unit of FBMC signal.Such as Fig. 1 institute Show, the transmitter of light FBMC mainly includes electric FBMC module and the optical modulator module that is made of laser and modulator.Wherein, electric FBMC generation module includes 0,1 digital signal, the first S/P, symbol mapping, the insertion based on Comb Pilot, IFFT, the first filtering Device group, DAC, P/S, pilot signal generate；0,1 digital signal is connected to the serioparallel exchange that the first S/P realizes signal, S/P output Enter the insertion module based on Comb Pilot after mapping by symbol together with pilot signal generation module, by entering through the module IFFT module passes through first filter group module, and the output of first filter group module is connected to P/S module, complete signal and String conversion；After the P/S module, signal enters DAC module, to complete the generation of electric FBMC；Electric FBMC module output connects It is connected to the optical modulator of laser driving, realizes the generation of light FBMC signal.The light FBMC signal of generation is transmitted by optical fiber Reach the receiver of FBMC signal.
The optical modulator module, be made of optical modulator, electric drive data and laser or by direct modulator and Electric drive data are constituted；
The laser, can be with distributed feedback laser, or common other types laser；
The optical modulator is external modulator, can be Mach zehnder modulators, or electroluminescent Absorption modulation device；
Light FBMC signal after being transmitted by standard single-mode fiber is introduced into the photoelectric conversion that photodetector realizes signal, And then electricity FBMC signal is generated, and which first passes through ADC into the 2nd S/P, second filter group is connected to by the 2nd S/P, the The output of two filter groups is connected to FFT module.FFT module output signal enters the interpolation that is first averaged by pilot tone abstraction module Estimation module after realize channel estimation.Signal after estimation is by realizing the compensation to FBMC signal is received after balance module. After compensated FBMC signal passes through symbol de-maps module again, into 0,1 data outputting unit, connecing for user data is realized It receives.
The estimation module of the interpolation that is first averaged, includes following steps:
Step S1: the pilot data extracted obtains pilot channel H by being based on LS methodl,k；
Step S2: in obtained Hl,kOn the basis of (k-th of subcarrier for referring to first of symbol), in the same subcarrier position The mean value that L symbol is sought at k is set, to obtain Hk；
Step S3: H is being obtainedkOn the basis of, by each HkCorresponding position extends in entire frame, that is, extends L symbol Number to get arrive H1 l,k；
Step S4: in obtained H1 l,kOn the basis of, in a fixed symbol l, between two neighboring pilot sub-carrier Data-signal new road characteristic, pass through the characteristic of channel H to adjacent pilot frequencies subcarrier1 l,kCarrying out interpolation can be obtained each symbol The characteristic of channel of interior data-signal realizes the channel estimation of valid data.
The confirmatory experiment parameter of the present embodiment is subcarrier number N=256, is modulated using 16QAM, signal attribute is Hermit Conjugation is symmetrical, pilot symbol interval T=50 frame, and using 6 rank PN code frame synchornization methods, SRRC filter function rolloff-factor α is 1, Storage depth is 2 equal settings, is compared algorithm performance.
Fig. 4 is the BER performance of optical transmission system modulate based on filter bank multi-carrier under the conditions of different channels are estimated Comparison diagram, horizontal axis are the optical power of receiving end, indicate that receiving sensitivity, unit are dBm, and the longitudinal axis is that BER indicates bit error rate size, Unit is dB.
In conclusion using it is of the invention based on Comb Pilot first be averaged interpolation channel estimation methods, can be more It is obviously improved the performance of light FBMC system, the pilot tone spending of system is reduced, more can preferably be applied to the light of large capacity, long range The demand of transmission network.
Specific embodiments of the present invention are described above.It is to be appreciated that the invention is not limited to above-mentioned Particular implementation, those skilled in the art can make a variety of changes or modify within the scope of the claims, this not shadow Ring substantive content of the invention.In the absence of conflict, the feature in embodiments herein and embodiment can any phase Mutually combination.

Claims (8)

1. a kind of low spending channel estimation methods for light FBMC Transmission system, which comprises the steps of:
Step 1: being inserted into pilot frequency information in the electric FBMC signal of generation, and the electric FBMC signal comprising pilot frequency information is converted into Light FBMC signal；
Step 2: light FBMC signal being transmitted through the fiber to receiving end, and is believed the light FBMC received using photodetector Number it is converted into electric FBMC signal；
Step 3: electric FBMC signal being demodulated, corresponding pilot frequency information is therefrom extracted；
Step 4: the average frequency response of pilot sub-carrier is estimated using the LS estimation method of average；
Step 5: the frequency response of data subcarrier in channel is estimated using linear interpolation method；
The step 1 includes: effective subcarrier in the L frame FBMC signal process of generation, in the FBMC signal of every frame In frequency band, it is inserted into a pilot frequency information every T subcarrier, the pilot frequency information is the data after symbol maps, the pilot tone Information and the effective subcarrier data for passing through symbol mapping enter IFFT together and ultimately generate electric FBMC signal；FBMC letter Number be connected to optical modulator, thus generate include pilot frequency information light FBMC signal.
2. the low spending channel estimation methods according to claim 1 for light FBMC Transmission system, which is characterized in that step IFFT described in rapid 1, for pilot frequency information and the valid data signal after symbol maps to be carried out IFFT operation, thus Conversion of the signal from frequency domain to time domain is completed, conversion signal is obtained.
3. the low spending channel estimation methods according to claim 1 for light FBMC Transmission system, which is characterized in that institute Stating the photodetector in step 2 includes: photodiode or avalanche diode；Optical fiber is single mode optical fiber.
4. the low spending channel estimation methods according to claim 1 for light FBMC Transmission system, which is characterized in that institute Stating step 3 includes: that electric FBMC signal is realized the pilot frequency information in FBMC signal by being transmitted to FFT module after serioparallel exchange It extracts；The FFT module is used for the FFT operation of signal, realizes conversion of the signal from frequency domain to time domain.
5. the low spending channel estimation methods according to claim 1 for light FBMC Transmission system, which is characterized in that institute Stating step 4 includes: the pilot frequency information for obtaining step 3, first passes through LS estimation, i.e., least square method obtains each pilot frequency locations Channel response realizes average operation of the different frame at the same sub-carrier positions based on the channel response, and realization is effectively led The estimated data of frequency channel.
6. the low spending channel estimation methods according to claim 1 for light FBMC Transmission system, which is characterized in that institute Stating step 5 includes: to be extended the channel evaluation data that effective pilot tone is obtained in step 4, i.e. pilot tone on realization L data frame The extension of channel estimation；Channel data based on extension carries out interpolation between the two neighboring pilot sub-carrier in each frame, real The now channel characteristic estimation data of the valid data subcarrier data in each FBMC frame；It is equal by force zero using the estimated data Weighing apparatus method realizes the compensation for receiving signal.
7. a kind of application system of the low spending channel estimation methods for light FBMC Transmission system characterized by comprising light FBMC transmitting module, FBMC receiving module and optical fiber, the smooth FBMC transmitting module believe the light FBMC comprising pilot frequency information Number FBMC receiving module is sent to by optical fiber, converts corresponding electricity FBMC for light FBMC signal by the FBMC receiving module Signal, and the pilot frequency information for including is extracted, obtain the estimation of the estimated data and the valid data characteristic of channel of pilot frequency information Data；
The smooth FBMC transmitting module includes: optical modulator module, the electricity FBMC signal generation mould being made of laser and modulator Block；
The optical modulator module includes: laser and modulator, wherein the output end of electric FBMC signal generation module be connected to by The optical modulator of laser driving, realizes the generation of light FBMC signal；
The electricity FBMC signal generation module includes: digital signal module, the first S/P module, symbol mapping block, is based on pectination The insertion module of pilot tone, IFFT module, first filter group, DAC module, P/S module, pilot signal generation module；The number Word signaling module is connected to the first S/P module for realizing the serioparallel exchange of signal, and the output of the first S/P module is mapped by symbol The extremely insertion module based on Comb Pilot of signal afterwards, the output end and IFFT module of the insertion module based on Comb Pilot It is connected, the signal comprising pilot frequency information is sent to first filter group by the IFFT module, and the output of first filter group connects It is connected to P/S module, the parallel-serial conversion of signal is completed by P/S module；The output signal of the P/S module enters DAC module, by institute State DAC module output electricity FBMC signal.
8. the application system of the low spending channel estimation methods according to claim 7 for light FBMC Transmission system, It is characterized in that, the FBMC receiving module includes: photodetector, ADC module, the 2nd S/P module, second filter group, FFT Module, pilot tone abstraction module, the estimation module for the interpolation that is first averaged, balance module, symbol de-maps module, the output of 0,1 data Unit；
Wherein, the FBMC signal received is successively transmitted to ADC module, the 2nd S/P module, the 2nd S/ by photodetector P module is connected to second filter group, and the output end of second filter group is connected to FFT module；The output signal of FFT module is logical Enter first the averagely estimation module of interpolation after crossing pilot tone abstraction module, realizes channel estimation；The balance module receives estimation Signal afterwards realizes the compensation to FBMC signal is received；Compensated FBMC signal passes through symbol de-maps module, 0,1 data It is exported after output unit, realizes the reception of user data.
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