CN105450577A - Filter bank multi-carrier visible light communication system and method based on DC (Direct Current) bias - Google Patents

Filter bank multi-carrier visible light communication system and method based on DC (Direct Current) bias Download PDF

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CN105450577A
CN105450577A CN201510882159.5A CN201510882159A CN105450577A CN 105450577 A CN105450577 A CN 105450577A CN 201510882159 A CN201510882159 A CN 201510882159A CN 105450577 A CN105450577 A CN 105450577A
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signal
stream
module
visible light
road
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CN105450577B (en
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党建
张在琛
吴亮
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Southeast University
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Southeast University
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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
    • H04L27/2626—Arrangements specific to the transmitter only
    • H04L27/2627—Modulators
    • H04L27/264—Pulse-shaped multi-carrier, i.e. not using rectangular window
    • 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
    • H04B10/11—Arrangements specific to free-space transmission, i.e. transmission through air or vacuum
    • H04B10/114—Indoor or close-range type systems
    • H04B10/116—Visible light communication
    • 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
    • H04L25/06—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection
    • H04L25/061—Dc level restoring means; Bias distortion correction ; Decision circuits providing symbol by symbol detection providing hard decisions only; arrangements for tracking or suppressing unwanted low frequency components, e.g. removal of dc offset

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

Abstract

The invention discloses a filter bank multi-carrier visible light communication system and method based on DC (Direct Current) bias. The system comprises a sending end and a receiving end; cores of the sending end and the receiving end respectively are a comprehensive filter bank processing module and an analysis filter bank processing module; by sub-band synthesis filters using actual value coefficients, the requirement that a sent signal is an actual value is met; and by using the DC bias, the requirement that the sent signal is a positive value is further met, so that a filter bank multi-carrier technology is successfully applied to the visible light communication. Compared with an existing OFDM (Orthogonal Frequency Division Multiplexing) multi-carrier based visible light communication system, the system provided by the invention has two obvious advantages that on one hand, a cyclic prefix does not need to be attached to a sending data block, so that sending power is saved and spectrum utilization efficiency is improved; and on the other hand, the provided system can well support an asynchronous transmission mode, so that flexibility of system design is improved, the requirement for synchronization of the sending and receiving ends of the system is reduced and the filter bank multi-carrier visible light communication system is beneficial for reducing system implementation cost.

Description

A kind of filter bank multi-carrier visible light communication system based on direct current biasing and method
Technical field
The invention belongs to visible light communication field, particularly relate to a kind of filter bank multi-carrier visible light communication system based on direct current biasing and method.
Background technology
At present, as the 5th generation one of cellular mobile communication (5G) key technology visible light communication (VLC, VisibleLightCommunication) just becoming the study hotspot of moving communicating field.Compared to existing radio-frequency range communication system, visible light communication has exempts from that frequency spectrum is authorized, latent capacity is high, Electro Magnetic Compatibility is good, safe and secret, harmless and provide the many advantages such as illumination simultaneously.
Visible light communication can be divided into relevant (Coherent) visible light communication and incoherent (Non-Coherent) visible light communication according to the coherence of transceiver.Relevant visible light communication techniques and methods used is almost consistent with radio communication, and IM/DD (intensity modulated/direct-detection) communication plan and radio communication are then very different.Compared to relevant visible light communication, incoherent visible light communication does not need modulation and recovers reference carrier, and be easier to realize, equipment cost is lower, is the very competitive communication plan of one.The main implementation of incoherent visible light communication is intensity modulated/direct-detection (IM/DD, IntensityModulation/DirectDetection), the intensity (Intensity) of the light signal sent at light source by modulates information is transmitted, uses photodetector to detect the change of light intensity to recover original information at receiving terminal.Therefore, IM/DD communication mode requires signal to be sent to be necessary for real number and is nonnegative number, to meet the physical significance of luminous intensity.It should be noted that in the visible ray radio communication that namely IM/DD communication plan can be applied in based on light-emitting diode (LED), also can be applied in the visible ray wire communication based on optical fiber.The transmission channel corresponding to system adopting IM/DD mode to communicate generally just is called IM/DD channel.
In view of the importance of IM/DD communication mode, technology contents of the present invention is defined in IM/DD communication mode, and the system and method announced is applicable to IM/DD channel, comprises radio communication channel and wireline communication channels.
For fully excavating the potentiality of visible light communication, as multicarrier (MC, Multi-Carrier) exemplary implementation of technology, OFDM (OFDM, OrthogonalFrequencyDivisionMultiplexing) technology is widely used in visible light communication.Under IM/DD communication mode category, multiple typical optical OFDM system has been had to be proposed successively, comprise direct current biasing light OFDM (DCO-OFDM, DirectCurrentOpticalOFDM), asymmetric amplitude limit light OFDM (ACO-OFDM, AsymmetricallyClippedOpticalOFDM), amplitude modulation(PAM) Discrete Multitone (PAM-DMT, PulseAmplitudeModulationDiscreteMultiTone), the unipolarity OFDM (eU-OFDM, enhancedUnipolarOFDM) etc. of reversion OFDM (Flip-OFDM) and enhancing.
Although these optical OFDM systems above-mentioned achieve good performance, but still there is the problem of some general character in them.Typical problem comprises: 1) these optical OFDM systems all need the pended cyclic prefix (CP when transfer of data, CyclicPrefix), so that elimination intersymbol interference, but, the introducing of CP adds transmitted power on the one hand, extend transmitting time on the other hand, thus reduce spectrum efficiency; 2) ofdm system needs each subcarrier stringent synchronization, do not support asynchronous transfer mode, this makes these optical OFDM systems for very strict to synchronous requirement when multi-user communication, and this can bring very large challenge to the design of sending and receiving end, also limit the flexibility of system.
Therefore, a kind of technical scheme that can overcome above-mentioned smooth OFDM defect is needed.
As another exemplary implementation of multi-transceiver technology, filter bank multi-carrier (FBMC, FilterBankMulti-Carrier) technology also receives the extensive concern of industry in recent years, and in 5G research the alternative of OFDM as an alternative.This can overcome the above-mentioned defect of OFDM preferably just because of FBMC: FBMC does not need additional CP, and the data flow on its each subcarrier (also referred to as subband) is also without the need to stringent synchronization.But, although the research of FBMC is extensively carried out in Radio-Frequency Wireless Communication, in visible light communication, about FBMC research report seldom, and in coherent communication mode under being only limitted to wire message way.Under IM/DD communication mode, no matter be wired or radio communication, be showed no correlative theses or patent literature.How under IM/DD channel, to design FBMC system, overcome the defect of optical OFDM system simultaneously, be still a problem demanding prompt solution.
Summary of the invention
Need additional CP for optical OFDM system existing under IM/DD communication mode and to synchronously requiring strict defect, the invention provides a kind of filter bank multi-carrier visible light communication system based on direct current biasing and method, the defect of existing system can be overcome.
To achieve the above object of the invention, technical scheme of the present invention is: a kind of filter bank multi-carrier visible light communication system based on direct current biasing, comprises transmitting terminal and receiving terminal;
Described transmitting terminal, comprising:
-interface and cache module, for receiving the message bit stream that also buffer memory will transmit from applications;
-digital baseband pretreatment module, for carrying out preliminary treatment to message bit stream, generates multichannel stream of modulation symbols;
-synthesis filter banks processing module, for carrying out synthesis filter banks process to the multichannel stream of modulation symbols that will transmit, makes each road stream of modulation symbols be loaded into respectively on a subband of bank of filters, and superposes generation one road multiple carrier digital signal stream;
-numeral/analog conversion module, for carrying out digital-to-analog conversion to the digital signal streams that will transmit, generates analog signal;
-biased and drive circuit module, for amplifying analog signal, additional direct current biasing simultaneously, makes the normal operation interval of the analog signal after amplifying and be biased and light source match;
-light source, for luminous under the driving of the simulation electrical domain signal through amplifying and be biased, thus is converted to light intensity signal by simulation electrical domain signal, and is sent in visible light communication channel;
Described receiving terminal comprises:
-optical-electrical converter and drive circuit module thereof, for being converted to the signal of telecommunication by the light intensity signal received by optical-electrical converter;
-amplification filtering module, for amplifying and filtering the electrical domain signal after opto-electronic conversion, connects the operation interval of analog-to-digital converting module after its signal amplitude is in, simultaneously filtering DC component and out-of-band noise;
-analog-to-digital converting module, for the analog electrical signal after amplification filtering is carried out analog/digital conversion, generates digital electrical domain signal, is convenient to receiver process;
-analysis filterbank processing module, for carrying out analysis filterbank process to digital electrical domain signal, is decomposed into the symbol stream of multidiameter delay transmission again by a road multi-carrier signal;
-balance module, equalization operation is carried out on each road for the multidiameter delay symbol stream exported analysis filterbank, eliminates the impact that channel distortions produces signal;
-digital baseband post-processing module, for carrying out reprocessing to through balanced multidiameter delay symbol stream, recovers an original road message bit stream;
-buffer memory and interface module, send to external object to apply for cache information bit stream.
Further, described digital baseband pretreatment module specifically comprises:
-modulation module, for flowing to horizontal pulse amplitude modulation(PAM) to bit, generates stream of modulation symbols;
-serioparallel exchange module, for carrying out serioparallel exchange to modulation symbol stream, changes the low-rate modulation symbol stream of multidiameter delay into by a road high speed symbol circulation;
Described digital baseband post-processing module specifically comprises:
-parallel serial conversion module, carries out parallel-serial conversion for multidiameter delay low speed symbol stream analysis filterbank exported, and forms road symbol stream at a high speed;
-symbol judgement module, for carrying out symbol judgement to the high speed symbol stream of input, exports the pulse amplitude modulation symbol stream through judgement;
-demodulation module, for carrying out demodulation to the pulse amplitude modulation symbol stream after judgement, namely separating planisphere and mapping, thus stream of modulation symbols being demodulated into corresponding bit stream.
Further, before the modulation module of digital baseband pretreatment module, add coding module and interleaving block;
-coding module, for carrying out chnnel coding to message bit stream, increases the reliability of transmission;
-interleaving block, for carrying out interleaving treatment to the message bit stream after coding, increases anti-continuous burst error ability;
After the demodulation module of digital baseband post-processing module, add de-interleaving block and decoder module;
-de-interleaving block, for carrying out deinterleaving operation to the bit stream through demodulation;
-decoder module, for decoding to the bit stream after deinterleaving, thus recovers original information bits stream.
Further, described synthesis filter banks processing module adopts the M passage cosine modulated filter banks with Perfect Reconstruction character, specifically comprises: M road walks abreast P times of up-sampler, for carrying out P times of up-sampling to modulation symbol stream, thus generates P group image spectra; M road parallel subband synthesis filter, the frequency response of every road sub-band synthesis filter only with front and back the frequency response of adjacent two-way sub-band synthesis filter overlapping, for carrying out sub-band filter to the stream of modulation symbols after up-sampling, take out one group of corresponding image spectra; Adder, for being added the multiple signals stream after sub-band filter, generate single channel digital signal streams, this road signal contains M way band signal, thus forms filter bank multi-carrier signal;
Described analysis filterbank processing module adopts the M passage cosine modulated filter banks with Perfect Reconstruction character, specifically comprise: M road parallel subband analysis filter, the frequency band of every road Subband Analysis Filter is identical with its corresponding sub-band synthesis filter, for carrying out sub-band filter to the digital electrical domain multi-carrier signal received, take out to should certain section of frequency band of Subband Analysis Filter in signal, thus generate M road parallel subband signal; M road walks abreast P times of down-sampler, for carrying out P times of down-sampling to the multichannel subband signal through sub-band analysis filtration, reducing sampling rate, thus subband spectrum is expanded to whole frequency band, generates M road and to walk abreast low speed symbol stream.
Further, in the multi-user mode, each user uses alone the branch road that the part in the branch road of the M in described synthesis filter banks is adjacent, use alone the branch road that the part in the branch road of the M in described analysis filterbank is adjacent, and the sequence number one_to_one corresponding of the synthesis filter banks branch road that uses of this user and analysis filterbank branch road.
Further, the sub-band synthesis filter in described synthesis filter banks and the Subband Analysis Filter in described analysis filterbank all adopt real-valued coefficients.
Further, described light source is light-emitting diode (LED) or laser diode (LD); Described optical-electrical converter is photodiode (PD).
Further, the size of described additional direct current biasing is taken as by the k of the standard deviation of the signal of additional direct current biasing doubly, and the interval of k is [Isosorbide-5-Nitrae].
Present invention also offers a kind of filter bank multi-carrier visible light communication method based on direct current biasing, concrete steps are as follows:
S1, receive message bit stream waiting for transmission from applications;
S2, message bit stream waiting for transmission is carried out digital preliminary treatment, comprise pulse amplitude modulation and serioparallel exchange, generate the stream of modulation symbols that M road is parallel;
S3, stream of modulation symbols is carried out synthesis filter banks process, generate filter bank multi-carrier digital signal;
S4, digital signal is carried out digital-to-analog conversion, generate analog electrical signal;
S5, direct current biasing is added to analog electrical signal and driving light source is luminous;
S6, with optical-electrical converter, the light signal received is converted to analog electrical signal;
S7, analog electrical signal to be amplified and filtering, filtering DC component;
S8, analog/digital conversion is carried out to analog electrical signal, generate digital signal;
S9, analysis filterbank process is carried out to digital signal, generate multidiameter delay symbol stream;
S10, equilibrium treatment is carried out to each road of multidiameter delay symbol stream, eliminate channel distortions impact;
S11, flow to the reprocessing of line number word to through balanced multidiameter delay symbol, comprise parallel-serial conversion, symbol judgement, demodulation, recover original information bits stream;
S12, the message bit stream recovered is sent to target application.
Further, between step S2 pulse amplitude modulation and serioparallel exchange, adding coding and interweave, for carrying out chnnel coding to message bit stream, and interleaving treatment being carried out to the message bit stream after coding; After step S11 demodulation, add deinterleaving and decoding, for carrying out deinterleaving operation to the bit stream through demodulation, and the bit stream after deinterleaving is decoded, and recover original information bits stream.To increase the reliability of transmission.
Beneficial effect:
The present invention discloses a kind of visible light communication system based on filter bank multi-carrier and the method that are applicable to IM/DD communication mode, and compared to the existing visible light communication system based on OFDM and method, technical scheme of the present invention has following beneficial effect:
(1) do not need data pended cyclic prefix in technical scheme of the present invention, thus save transmitted power, improve spectrum efficiency simultaneously;
(2) technical scheme of the present invention supports the symbol stream asynchronous transmission on each subcarrier (i.e. subband), thus adds the flexibility of system, and simplify the stringent synchronization requirement between transceiver, what be conducive to reduction system realizes cost.
Accompanying drawing explanation
In order to be illustrated more clearly in technical scheme of the present invention and embodiment, below technical scheme being described and in embodiment, needing the accompanying drawing used to be briefly described.
Fig. 1 for carry transmitting terminal based on the filter bank multi-carrier visible light communication system of direct current biasing and receiving terminal block diagram;
Fig. 2 for carry the flow chart of the filter bank multi-carrier visible light communication method based on direct current biasing;
Fig. 3 for carry based on direct current biasing filter bank multi-carrier visible light communication system in the digital baseband pretreatment module block diagram of transmitting terminal;
Fig. 4 for carry based on direct current biasing filter bank multi-carrier visible light communication system in the synthesis filter banks processing module block diagram of transmitting terminal;
Fig. 5 for carry based on direct current biasing filter bank multi-carrier visible light communication system in the analysis filterbank processing module block diagram of receiving terminal;
Fig. 6 for carry based on direct current biasing filter bank multi-carrier visible light communication system in the digital baseband post-processing module block diagram of receiving terminal;
Fig. 7 is in embodiment, carry filter bank multi-carrier visible light communication system mesarcs filter h based on direct current biasing pthe time domain impulse response of (n);
Fig. 8 is in embodiment, carry based on direct current biasing filter bank multi-carrier visible light communication system in the frequency domain amplitude response of each sub-band synthesis filter in synthesis filter banks; Meanwhile, to carry the frequency domain amplitude response of each Subband Analysis Filter in analysis filterbank in system also identical with Fig. 8;
Fig. 9 is in embodiment, the frequency domain amplitude response of each subcarrier in DCO-OFMD multi-carrier visible light communication system;
Figure 10 is in embodiment, under Gaussian white noise channel and synchronous transfer module, adopt carry and change simulation comparison figure based on the filter bank multi-carrier visible light communication system of direct current biasing and the bit error rate curve of existing DCO-OFDM visible light communication system with bit signal to noise ratio;
Figure 11 is in embodiment, under multipath channel and synchronous transfer module, adopt carry and change simulation comparison figure based on the filter bank multi-carrier visible light communication system of direct current biasing and the bit error rate curve of existing DCO-OFDM visible light communication system with bit signal to noise ratio;
Figure 12 is in embodiment, under Gaussian white noise channel and asynchronous transfer mode, adopt carry and change simulation comparison figure based on the filter bank multi-carrier visible light communication system of direct current biasing and the bit error rate curve of existing DCO-OFDM visible light communication system with bit signal to noise ratio;
Figure 13 is in embodiment, under multipath channel and asynchronous transfer mode, adopt carry and change simulation comparison figure based on the filter bank multi-carrier visible light communication system of direct current biasing and the bit error rate curve of existing DCO-OFDM visible light communication system with bit signal to noise ratio;
Wherein: expression DCO-OFDM system emulation result, represent that the present invention carries system and method simulation result.
Embodiment
Below in conjunction with the drawings and specific embodiments, illustrate the present invention further, these embodiments should be understood only be not used in for illustration of the present invention and limit the scope of the invention, after having read the present invention, the amendment of those skilled in the art to the various equivalent form of value of the present invention has all fallen within the application's claims limited range.
One embodiment of the present of invention give a kind of filter bank multi-carrier visible light communication system based on direct current biasing, for overcoming the inherent shortcoming of existing use OFDM multi-carrier mode system.Described system comprises transmitting terminal and receiving terminal;
Described transmitting terminal (please refer to Fig. 1) comprising:
-interface and cache module, for receiving the message bit stream that also buffer memory will transmit from applications;
-digital baseband pretreatment module (please refer to Fig. 1 and Fig. 3), for carrying out preliminary treatment to message bit stream, generates multichannel stream of modulation symbols; Specifically comprising: modulation module, for carrying out 4 system pulse amplitude modulation (4-PAM, 4-PulseAmplitudeModulation) to message bit stream, generating stream of modulation symbols; Serioparallel exchange module, for carrying out serioparallel exchange to modulation symbol stream, changes the low-rate modulation symbol stream of multidiameter delay into by a road high speed symbol circulation;
-synthesis filter banks processing module (please refer to Fig. 1 and Fig. 4), for carrying out synthesis filter banks process to the multichannel stream of modulation symbols that will transmit, each road stream of modulation symbols is loaded on a subband of bank of filters respectively, and superposes generation one road multiple carrier digital signal stream; Described synthesis filter group selection adopts the synthesis filter banks had in M passage cosine modulated filter banks (CMFB, CosineModulatedFilterBanks) of Perfect Reconstruction character; Described parameter M value is M=16 (accordingly, up-sampling factor P=16); M in described synthesis filter banks, m=1,2 ..., M, the coefficient expressions of sub-band synthesis filter is:
f m ( n ) = 2 h p ( n ) cos ( π M ( m - 0.5 ) ( n + M + 1 2 ) ) , n = 0 , 1 , ... , N f - 1 ,
Wherein, N f=128, h pn () is prototype filter, value as shown in Figure 7, f m(n), m=1,2, M, frequency domain amplitude response as shown in Figure 8, as shown in Figure 8, the frequency response of each subband is logical for being with, only adjacent intersubband exists overlapping, and non-conterminous intersubband does not exist that overlapping (in other words, the maximum amplitude value of overlapping part is minimum, lower than-60dB), this be proposition system support the major reason of asynchronous transfer mode.And in the existing system based on OFDM multicarrier, each subcarrier has very long " hangover " effect (referring to Fig. 9), all have with other all subcarrier that overlapping (maximum amplitude value of overlapping part is-13dB, much larger than-60dB), once employing asynchronous transfer mode destroys the orthogonality between subcarrier, to serious inter-sub-carrier interference be caused, worsen system transfers performance.
-numeral/analog conversion module, for carrying out digital-to-analog conversion to the digital signal streams that will transmit, generates analog signal;
-biased and drive circuit module, for amplifying analog signal, additional direct current biasing simultaneously, makes the normal operation interval of the analog signal after amplifying and be biased and light source match; Described direct current biasing value is by k times of the standard deviation of adding the signal of direct current biasing; Described parameter k value is k=3.5;
-light source, for luminous under the driving of the simulation electrical domain signal through amplifying and be biased, thus is converted to light intensity signal by simulation electrical domain signal, and is sent in visible light communication channel; Described light source is light-emitting diode (LED);
Described receiving terminal (please refer to Fig. 1) comprising:
-optical-electrical converter and drive circuit module thereof, for being converted to the signal of telecommunication by the light intensity signal received by optical-electrical converter; Described optical-electrical converter is photodiode (PD);
-amplification filtering module, for amplifying and filtering the electrical domain signal after opto-electronic conversion, connects the operation interval of analog-to-digital converting module after its signal amplitude is in, simultaneously filtering DC component and out-of-band noise;
-analog-to-digital converting module, for the analog electrical signal after amplification filtering is carried out analog/digital conversion, generates digital electrical domain signal, is convenient to receiver process;
-analysis filterbank processing module (please refer to Fig. 1 and Fig. 5), for carrying out analysis filterbank process to digital electrical domain signal, is decomposed into the symbol stream of multidiameter delay transmission again by a road multi-carrier signal; Described analysis filter group selection adopts the analysis filterbank in aforementioned M (M=16, accordingly, down-sampling factor P=16) the passage cosine modulated filter banks with Perfect Reconstruction character; M in described analysis filterbank, m=1,2 ..., M, the coefficient expressions of Subband Analysis Filter is:
h m ( n ) = 2 h p ( n ) cos ( π M ( m - 0.5 ) ( N f - 1 - n + M + 1 2 ) ) , n = 0 , 1 , ... , N f ,
Wherein, N f=128, h pn () value as shown in Figure 7; h m(n), m=1,2 ..., M, frequency domain amplitude response and f m(n), m=1,2 ..., M, frequency domain amplitude response identical, can with reference to figure 8.
-balance module: equalization operation is carried out on each road for the multidiameter delay symbol stream exported analysis filterbank, eliminates the impact that channel distortions produces signal; The balanced single tap equalizers adopted based on ZF (ZF, ZeroForcing) criterion, the channel frequency domain response of value corresponding to each subband center frequency inverse;
-digital baseband post-processing module (please refer to Fig. 1 and Fig. 6), for carrying out reprocessing to through balanced multidiameter delay symbol stream, recovers an original road message bit stream; Specifically comprise: parallel serial conversion module, carry out parallel-serial conversion for multidiameter delay low speed symbol stream analysis filterbank exported, form road symbol stream at a high speed; Symbol judgement module, for carrying out symbol judgement to the high speed symbol stream of input, exports the 4 system pulse amplitude modulation symbol streams through judgement; Demodulation module, for carrying out demodulation to the pulse amplitude modulation symbol stream after judgement, namely separating planisphere and mapping, thus stream of modulation symbols being demodulated into corresponding bit stream;
-buffer memory and interface module, send to external object to apply for cache information bit stream;
Based on above-mentioned visible light communication system, present invention also offers a kind of filter bank multi-carrier visible light communication method (please refer to Fig. 2) based on direct current biasing, specifically comprise:
S1, receive message bit stream waiting for transmission from applications;
S2, message bit stream waiting for transmission is carried out digital preliminary treatment, comprise 4 system pulse amplitude modulation and serioparallel exchange, generate the stream of modulation symbols that M=16 road is parallel;
S3, stream of modulation symbols is carried out synthesis filter banks process, generate filter bank multi-carrier digital signal; Described synthesis filter banks adopts the synthesis filter banks had in 16 passage cosine modulated filter banks of Perfect Reconstruction character, and filter length is 128;
S4, digital signal is carried out digital-to-analog conversion, generate analog electrical signal;
S5, direct current biasing is added to analog electrical signal and driving light source is luminous; Additional direct current biasing size is k times of biased front signal standard deviation, and k value is 3.5;
S6, with optical-electrical converter, the light signal received is converted to analog electrical signal;
S7, analog electrical signal to be amplified and filtering, filtering DC component;
S8, analog/digital conversion is carried out to analog electrical signal, generate digital signal;
S9, analysis filterbank process is carried out to digital signal, generate multidiameter delay symbol stream; Described analysis filterbank adopts the analysis filterbank had in 16 passage cosine modulated filter banks of Perfect Reconstruction character, and filter length is 128;
S10, equilibrium treatment is carried out to each road of multidiameter delay symbol stream, eliminate channel distortions impact; Equalizer coefficients adopts the single tap equalizers based on Zero Forcing, and coefficient is the inverse of each subband center point respective channels frequency domain response;
S11, flow to the reprocessing of line number word to through balanced multidiameter delay symbol, comprise parallel-serial conversion, symbol judgement and demodulation, recover original information bits stream;
S12, the message bit stream recovered is sent to target application.
In the above embodiment of the present invention, by being combined pulse amplitude modulation and cosine modulated filter banks, make to send the requirement that signal meets real number value; By using direct current biasing, making transmission signal meet positive further must ask, thus successfully filter bank multi-carrier technology is applied in the visible light communication system of IM/DD mode; Compared to the existing visible light communication system based on OFDM multicarrier, the filter bank multi-carrier visible light communication system based on direct current biasing proposed and method have without the need to additional CP, the advantage supporting intersubband asynchronous transmission, and concrete quantification comparative result please refer to Figure 10-Figure 13.
Figure 10 compares in the above-described embodiments, under Gaussian white noise channel and synchronous transfer module, the simulation curve that the bit error rate of the filter bank multi-carrier visible light communication system based on direct current biasing proposed and existing DCO-OFDM multi-carrier visible light communication system changes with bit signal to noise ratio (Eb/No).Wherein, in order to the fairness compared, the direct current biasing value of DCO-OFDM is also k=3.5 times of biased front signal standard deviation, and modulation system is 4 2=16 ary quadrature amplitude (16-QAM, 16-QuadratureAmplitudeModulation), number of sub carrier wave N=2M=32 (selected modulation mode and number of sub carrier wave ensure that: DCO-OFDM takies same frequency band with carried system, adopts same bit transmission rate), CP length is G=8.Figure 10 result shows, the performance of BER carried based on the filter bank multi-carrier visible light communication system of direct current biasing be better than DCO-OFDM system, this advantage is because carried filter bank multi-carrier visible light communication system is without the need to additional CP, and the transmitted power of saving may be used for the reliability strengthening effective information transmission.
Figure 11 compares in the above-described embodiments, under multipath channel and synchronous transfer module, the simulation curve that the bit error rate of the filter bank multi-carrier visible light communication system based on direct current biasing proposed and existing DCO-OFDM multi-carrier visible light communication system changes with bit signal to noise ratio (Eb/No).Wherein, in order to the fairness compared, the direct current biasing value of DCO-OFDM is also k=3.5 times of biased front signal standard deviation, and modulation system is 4 2=16 ary quadrature amplitude (16-QAM, 16-QuadratureAmplitudeModulation), number of sub carrier wave N=2M=32 (selected modulation mode and number of sub carrier wave ensure that: DCO-OFDM takies same frequency band with carried system, adopts same bit transmission rate), CP length is G=8.Normalized channel impulse response coefficient is: [0.8945,0.3902,0.1859,0.0951,0.0516,0.0294,0.0174,0.0107].Figure 11 result shows, the performance of BER carried based on the filter bank multi-carrier visible light communication system of direct current biasing be better than DCO-OFDM system, this advantage is because carried filter bank multi-carrier visible light communication system is without the need to additional CP, and the transmitted power of saving may be used for the reliability strengthening effective information transmission.
Figure 12 compares in the above-described embodiments, under Gaussian white noise channel and asynchronous transfer mode, the simulation curve that the bit error rate of the filter bank multi-carrier visible light communication system based on direct current biasing proposed and existing DCO-OFDM multi-carrier visible light communication system changes with bit signal to noise ratio (Eb/No).Wherein, in order to the fairness compared, the direct current biasing value of DCO-OFDM is also k=3.5 times of biased front signal standard deviation, and modulation system is 4 2=16 ary quadrature amplitude (16-QAM, 16-QuadratureAmplitudeModulation), number of sub carrier wave N=2M=32 (selected modulation mode and number of sub carrier wave ensure that: DCO-OFDM takies same frequency band with carried system, adopts same bit transmission rate), CP length is G=8.Under asynchronous mode, suppose there are two users, take the subband (for carried system) of the first half or the subband of subcarrier (for DCO-OFDM) and later half or subcarrier respectively, a null subcarrier is used to carry out insulation blocking (the present embodiment adopts the 1st subband of second user as insulation blocking subband) between two sections of frequency bands, in addition, the timing offset within 1 sample value symbol is allowed between the data block that these two users send, and suppose that this timing offset is-1 with identical probability random value, 0 (i.e. zero deflection, be equivalent to synchronous transfer module), with 1 sample value symbol period.Figure 12 result shows, the performance of BER carried based on the filter bank multi-carrier visible light communication system of direct current biasing be better than DCO-OFDM system, this advantage is because carried filter bank multi-carrier visible light communication system is without the need to additional CP on the one hand, the transmitted power of saving may be used for the reliability strengthening effective information transmission, prior one side is because carried system supports asynchronous transfer mode, and DCO-OFDM can not support asynchronous mode well.
Figure 13 compares in the above-described embodiments, under multipath channel and asynchronous transfer mode, the simulation curve that the bit error rate of the filter bank multi-carrier visible light communication system based on direct current biasing proposed and existing DCO-OFDM multi-carrier visible light communication system changes with bit signal to noise ratio (Eb/No).Wherein, in order to the fairness compared, the direct current biasing value of DCO-OFDM is also k=3.5 times of biased front signal standard deviation, and modulation system is 4 2=16 ary quadrature amplitude (16-QAM, 16-QuadratureAmplitudeModulation), number of sub carrier wave N=2M=32 (selected modulation mode and number of sub carrier wave ensure that: DCO-OFDM takies same frequency band with carried system, adopts same bit transmission rate), CP length is G=8.Normalized channel impulse response coefficient is: [0.8945,0.3902,0.1859,0.0951,0.0516,0.0294,0.0174,0.0107].Under asynchronous mode, suppose there are two users, take the subband (for carried system) of the first half or the subband of subcarrier (for DCO-OFDM) and later half or subcarrier respectively, a null subcarrier is used to carry out insulation blocking (the present embodiment adopts the 1st subband of second user as insulation blocking subband) between two sections of frequency bands, in addition, the timing offset within 1 sample value symbol is allowed between the data block that these two users send, and suppose that this timing offset is-1 with identical probability random value, 0 (i.e. zero deflection, be equivalent to synchronous transfer module), with 1 sample value symbol period.Figure 13 result shows, the performance of BER carried based on the filter bank multi-carrier visible light communication system of direct current biasing be better than DCO-OFDM system, this advantage is because carried filter bank multi-carrier visible light communication system is without the need to additional CP on the one hand, the transmitted power of saving may be used for the reliability strengthening effective information transmission, prior one side is because carried system supports asynchronous transfer mode, and DCO-OFDM can not support asynchronous mode well.
As preferred embodiment, the present invention, before the modulation module of digital baseband pretreatment module, adds coding module and interleaving block, coding module, for carrying out chnnel coding to message bit stream, increases the reliability of transmission; Interleaving block, for carrying out interleaving treatment to the message bit stream after coding, increases anti-continuous burst error ability.Meanwhile, after the demodulation module of digital baseband post-processing module, add de-interleaving block and decoder module, de-interleaving block, for carrying out deinterleaving operation to the bit stream through demodulation; Decoder module, for decoding to the bit stream after deinterleaving, thus recovers original information bits stream.Coding module and interleaving block and de-interleaving block and decoder module need conbined usage, to increase the reliability of transmission.

Claims (10)

1. based on a filter bank multi-carrier visible light communication system for direct current biasing, it is characterized in that, comprise transmitting terminal and receiving terminal;
Described transmitting terminal, comprising:
-interface and cache module, for receiving the message bit stream that also buffer memory will transmit from applications;
-digital baseband pretreatment module, for carrying out preliminary treatment to message bit stream, generates multichannel stream of modulation symbols;
-synthesis filter banks processing module, for carrying out synthesis filter banks process to the multichannel stream of modulation symbols that will transmit, makes each road stream of modulation symbols be loaded into respectively on a subband of bank of filters, and superposes generation one road multiple carrier digital signal stream;
-numeral/analog conversion module, for carrying out digital-to-analog conversion to the digital signal streams that will transmit, generates analog signal;
-biased and drive circuit module, for amplifying analog signal, additional direct current biasing simultaneously, makes the normal operation interval of the analog signal after amplifying and be biased and light source match;
-light source, for luminous under the driving of the simulation electrical domain signal through amplifying and be biased, thus is converted to light intensity signal by simulation electrical domain signal, and is sent in visible light communication channel;
Described receiving terminal comprises:
-optical-electrical converter and drive circuit module thereof, for being converted to the signal of telecommunication by the light intensity signal received by optical-electrical converter;
-amplification filtering module, for amplifying and filtering the electrical domain signal after opto-electronic conversion, connects the operation interval of analog-to-digital converting module after its signal amplitude is in, simultaneously filtering DC component and out-of-band noise;
-analog-to-digital converting module, for the analog electrical signal after amplification filtering is carried out analog/digital conversion, generates digital electrical domain signal;
-analysis filterbank processing module, for carrying out analysis filterbank process to digital electrical domain signal, is decomposed into the symbol stream of multidiameter delay transmission again by a road multi-carrier signal;
-balance module, equalization operation is carried out on each road for the multidiameter delay symbol stream exported analysis filterbank, eliminates the impact that channel distortions produces signal;
-digital baseband post-processing module, for carrying out reprocessing to through balanced multidiameter delay symbol stream, recovers an original road message bit stream;
-buffer memory and interface module, send to external object to apply for cache information bit stream.
2. a kind of filter bank multi-carrier visible light communication system based on direct current biasing according to claim 1, it is characterized in that, described digital baseband pretreatment module specifically comprises:
-modulation module, for flowing to horizontal pulse amplitude modulation(PAM) to bit, generates stream of modulation symbols;
-serioparallel exchange module, for carrying out serioparallel exchange to modulation symbol stream, changes the low-rate modulation symbol stream of multidiameter delay into by a road high speed symbol circulation;
Described digital baseband post-processing module specifically comprises:
-parallel serial conversion module, carries out parallel-serial conversion for multidiameter delay low speed symbol stream analysis filterbank exported, and forms road symbol stream at a high speed;
-symbol judgement module, for carrying out symbol judgement to the high speed symbol stream of input, exports the pulse amplitude modulation symbol stream through judgement;
-demodulation module, for carrying out demodulation to the pulse amplitude modulation symbol stream after judgement, namely separating planisphere and mapping, thus stream of modulation symbols being demodulated into corresponding bit stream.
3. a kind of filter bank multi-carrier visible light communication system based on direct current biasing according to claim 2, is characterized in that, before the modulation module of digital baseband pretreatment module, add coding module and interleaving block;
-coding module, for carrying out chnnel coding to message bit stream;
-interleaving block, for carrying out interleaving treatment to the message bit stream after coding;
After the demodulation module of digital baseband post-processing module, add de-interleaving block and decoder module;
-de-interleaving block, for carrying out deinterleaving operation to the bit stream through demodulation;
-decoder module, for decoding to the bit stream after deinterleaving, thus recovers original information bits stream.
4. a kind of filter bank multi-carrier visible light communication system based on direct current biasing according to claim 1, it is characterized in that, described synthesis filter banks processing module adopts the M passage cosine modulated filter banks with Perfect Reconstruction character, specifically comprise: M road walks abreast P times of up-sampler, for carrying out P times of up-sampling to modulation symbol stream, thus generate P group image spectra; M road parallel subband synthesis filter, the frequency response of every road sub-band synthesis filter only with front and back the frequency response of adjacent two-way sub-band synthesis filter overlapping, for carrying out sub-band filter to the stream of modulation symbols after up-sampling, take out one group of corresponding image spectra; Adder, for being added the multiple signals stream after sub-band filter, generate single channel digital signal streams, this road signal contains M way band signal, thus forms filter bank multi-carrier signal;
Described analysis filterbank processing module adopts the M passage cosine modulated filter banks with Perfect Reconstruction character, specifically comprise: M road parallel subband analysis filter, the frequency band of every road Subband Analysis Filter is identical with its corresponding sub-band synthesis filter, for carrying out sub-band filter to the digital electrical domain multi-carrier signal received, take out to should certain section of frequency band of Subband Analysis Filter in signal, thus generate M road parallel subband signal; M road walks abreast P times of down-sampler, for carrying out P times of down-sampling to the multichannel subband signal through sub-band analysis filtration, reducing sampling rate, thus subband spectrum is expanded to whole frequency band, generates M road and to walk abreast low speed symbol stream.
5. a kind of filter bank multi-carrier visible light communication system based on direct current biasing according to claim 4, it is characterized in that, in the multi-user mode, each user uses alone the branch road that the part in the branch road of the M in described synthesis filter banks is adjacent, use alone the branch road that the part in the branch road of the M in described analysis filterbank is adjacent, and the sequence number one_to_one corresponding of the synthesis filter banks branch road that uses of this user and analysis filterbank branch road.
6. a kind of filter bank multi-carrier visible light communication system based on direct current biasing according to claim 4, it is characterized in that, the Subband Analysis Filter in the sub-band synthesis filter in described synthesis filter banks and described analysis filterbank all adopts real-valued coefficients.
7. a kind of filter bank multi-carrier visible light communication system based on direct current biasing according to claim 1, is characterized in that, described light source is light-emitting diode (LED) or laser diode (LD); Described optical-electrical converter is photodiode (PD).
8. a kind of filter bank multi-carrier visible light communication system based on direct current biasing according to claim 1, it is characterized in that, the size of described additional direct current biasing is taken as by the k of the standard deviation of the signal of additional direct current biasing doubly, and the interval of k is [Isosorbide-5-Nitrae].
9. utilize a kind of filter bank multi-carrier visible light communication method based on direct current biasing that a kind of filter bank multi-carrier visible light communication system based on direct current biasing described in the arbitrary claim of claim 1-8 realizes, it is characterized in that, concrete steps are as follows:
S1, receive message bit stream waiting for transmission from applications;
S2, message bit stream waiting for transmission is carried out digital preliminary treatment, comprise pulse amplitude modulation and serioparallel exchange, generate the stream of modulation symbols that M road is parallel;
S3, stream of modulation symbols is carried out synthesis filter banks process, generate filter bank multi-carrier digital signal;
S4, digital signal is carried out digital-to-analog conversion, generate analog electrical signal;
S5, direct current biasing is added to analog electrical signal and driving light source is luminous;
S6, with optical-electrical converter, the light signal received is converted to analog electrical signal;
S7, analog electrical signal to be amplified and filtering, filtering DC component;
S8, analog/digital conversion is carried out to analog electrical signal, generate digital signal;
S9, analysis filterbank process is carried out to digital signal, generate multidiameter delay symbol stream;
S10, equilibrium treatment is carried out to each road of multidiameter delay symbol stream, eliminate channel distortions impact;
S11, flow to the reprocessing of line number word to through balanced multidiameter delay symbol, comprise parallel-serial conversion, symbol judgement, demodulation, recover original information bits stream;
S12, the message bit stream recovered is sent to target application.
10. a kind of filter bank multi-carrier visible light communication system based on direct current biasing according to claim 9, it is characterized in that, between step S2 pulse amplitude modulation and serioparallel exchange, add coding and interweave, for carrying out chnnel coding to message bit stream, and interleaving treatment is carried out to the message bit stream after coding; After step S11 demodulation, add deinterleaving and decoding, for carrying out deinterleaving operation to the bit stream through demodulation, and the bit stream after deinterleaving is decoded, and recover original information bits stream.
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