CN108259403A - A kind of VLC/RF mixes OFDM baseband system - Google Patents
A kind of VLC/RF mixes OFDM baseband system Download PDFInfo
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- CN108259403A CN108259403A CN201810065011.6A CN201810065011A CN108259403A CN 108259403 A CN108259403 A CN 108259403A CN 201810065011 A CN201810065011 A CN 201810065011A CN 108259403 A CN108259403 A CN 108259403A
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- vlc
- ofdm
- base band
- hro
- mixing
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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
- H04L27/2628—Inverse Fourier transform modulators, e.g. inverse fast Fourier transform [IFFT] or inverse discrete Fourier transform [IDFT] modulators
-
- 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
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/2605—Symbol extensions, e.g. Zero Tail, Unique Word [UW]
- H04L27/2607—Cyclic extensions
-
- 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
- H04L27/2649—Demodulators
- H04L27/265—Fourier transform demodulators, e.g. fast Fourier transform [FFT] or discrete Fourier transform [DFT] demodulators
Abstract
The invention discloses a kind of VLC/RF to mix OFDM baseband system, and key modules therein are bandwidth power distributor, bandwidth power combiner, mixing IFFT and mixing FFT.Bandwidth power distributor is used to distribute the Bit String of different length to VLC/RF links, and for bandwidth power combiner for merging the Bit String of VLC/RF chains road, mixing IFFT mixes FFT for solving HRO OFDM symbols for generating mixing HRO OFDM symbols.Invention further provides a kind of HRO OFDM optimization methods for being applicable in above-mentioned base band, and the method achieve the Core Features of bandwidth power distributor and bandwidth power combiner.The present invention solves the drawbacks of traditional mixing VLC/RF accesses dot system can only use discrete access point and cannot dispatch base band power and bandwidth simultaneously, and pass through HRO OFDM optimization methods and further improve user rate, access dot system better than existing RF OFDM base band, VLC OFDM base band and traditional mixing VLC/RF.
Description
Technical field
The present invention relates to visible light communication and field of radio frequency communication more particularly to a kind of VLC/RF mixing OFDM base band systems
System.
Background technology
VLC (Visible Light Communication, it is seen that optic communication) technology refers to the light using visible light wave range
As information carrier, without the transmission medium of the wire channel such as optical fiber, the communication mode of optical signal is directly transmitted in air.With
It demand of the people to data service constantly to increase, wireless network is constantly promoting available capacity and spectrum efficiency.So
And since frequency spectrum resource is limited, and most frequency spectrum has been authorized to occupy, radio band becomes more and more crowded.VLC makees
For emerging wireless communication technique, it is sent to great expectations.VLC can provided using the frequency spectrum resource of extremely abundant unauthorized
While normal illumination, the communication link of very high speed is provided, is had with roomy, green low-carbon, safe and inexpensive etc.
Advantage.
RF (Radio Frequency, less radio-frequency) refers to electromagnetic wave of the spectral range between 500MHz to 38GHz,
It is usually used in being modulated signal transmission in the field of communications.
OFDM (Orthogonal Frequency Division Multiplexing, orthogonal frequency division multiplexi) is one
Kind multi-carrier modulation technology, breaks a channel into several orthogonal sub-channels, high-speed data signal is converted into parallel low speed subnumber
According to stream, it is modulated to and is transmitted on each of the sub-channels.Orthogonal signalling can by being separated in receiving terminal using the relevant technologies,
Interfering with each other (ISI) between subchannel can be reduced in this way.Signal bandwidth on per sub-channels is less than the associated band of channel
Width, therefore flatness decline can be regarded on every sub-channels as, so as to eliminate intersymbol interference, and due to every sub-channels
Bandwidth be only former channel width sub-fraction, channel equalization becomes relatively easy.Its modulation and demodulation are difference bases
It is realized in IFFT and FFT, is a kind of multi-carrier transmission scheme that implementation complexity is minimum, most widely used.
In future, with the propulsion of visible light communication technology, can there are many VLC access points and RF accesses indoors
Point, therefore, the base band of VLC access points can be merged with the base band of RF access points, form a mixed base band.In mixed base
In band, VLC and RF complement one another, and can reach higher capacity and rate using the respective characteristic of channel, more preferable so as to provide
Data service.
The method that signal transmission is carried out in view of VLC and RF is different, need a kind of suitable mixed base band designing scheme and
A kind of suitable OFDM methods come ensure compatibility and stability.But there is presently no more perfect schemes.
Invention content
The object of the present invention is to provide a kind of VLC/RF to mix OFDM baseband system, can improve baseband performance, is promoted and passed
Defeated rate.
The purpose of the present invention is what is be achieved through the following technical solutions：
A kind of VLC/RF mixes OFDM baseband system, including：Transmitter base band and receiver base band；Wherein：
Transmitter base band is distributed for carrying out bandwidth power to the bit sequence of input with exporting distinct symbols after modulation,
Contain the symbol of VLC link transmissions and the symbol of RF link transmissions, the symbol of VLC link transmissions and the symbol of RF link transmissions
HRO-OFDM symbols all the way are respectively transformed to by mixing IFFT modes, two-way HRO-OFDM symbols are after parallel-serial conversion
The corresponding LED that is transmitted to emitting outward on antenna；
For receiving two-way HRO-OFDM symbols, phase is obtained by serioparallel exchange with mixing IFFT modes for receiver base band
The symbol for the VLC link transmissions answered and the symbol of RF link transmissions, then by demodulating with being transmitted to after bandwidth power merging treatment
The bit stay of two nights；Meanwhile receiver base band also carries out channel estimation to subcarrier each in RF links and VLC links and feeds back to hair
Machine base band is penetrated, the bandwidth power method of salary distribution is adjusted according to these feedback informations by transmitter base band.
As seen from the above technical solution provided by the invention, it can realize that the structure of VLC/RF mixing OFDM base band is set
Meter promotes the overall performance of base band；Meanwhile can allow power with bandwidth allocation in RF links with being kept in VLC links
Certain balance, when VLC links cause attenuation since visual range is limited, by the bandwidth allocation of VLC chains road to RF links
On so that it is same level that rate, which can be maintained at individual RF-OFDM base band, avoids the hydraulic performance decline of system.
Description of the drawings
In order to illustrate the technical solution of the embodiments of the present invention more clearly, required use in being described below to embodiment
Attached drawing be briefly described, it should be apparent that, the accompanying drawings in the following description is only some embodiments of the present invention, for this
For the those of ordinary skill in field, without creative efforts, other are can also be obtained according to these attached drawings
Attached drawing.
Fig. 1 is the schematic diagram that a kind of VLC/RF provided in an embodiment of the present invention mixes OFDM baseband system；
Fig. 2 is the schematic diagram of HRO-OFDM optimization methods provided in an embodiment of the present invention；
Fig. 3 is system emulation schematic diagram of a scenario provided in an embodiment of the present invention；
Fig. 4 is the present invention program provided in an embodiment of the present invention and the performance analysis chart of traditional scheme.
Specific embodiment
With reference to the attached drawing in the embodiment of the present invention, the technical solution in the embodiment of the present invention is carried out clear, complete
Ground describes, it is clear that described embodiment is only part of the embodiment of the present invention, instead of all the embodiments.Based on this
The embodiment of invention, the every other implementation that those of ordinary skill in the art are obtained without making creative work
Example, belongs to protection scope of the present invention.
The embodiment of the present invention provides a kind of VLC/RF mixing OFDM baseband system, can be used for solving VLC links and RF chains
The problem of road is encountered when base band is mixed, while solve the design problem of the OFDM under mixed base band.System is mainly tied
Structure as shown in Figure 1, suitable for the baseband system HRO-OFDM (Hybrid of Radio and Optical OFDM, mixing
Wireless electric light Orthogonal Frequency Division Multiplexing) optimization method principle as shown in Fig. 2, the simulating scenes of system as described in Figure 3.
Referring to Fig. 1, which mainly includes two parts：Transmitter base band and receiver base band；Wherein：
Transmitter base band is distributed for carrying out bandwidth power to the bit sequence of input with exporting distinct symbols after modulation,
Contain the symbol of VLC link transmissions and the symbol of RF link transmissions, the symbol of VLC link transmissions and the symbol of RF link transmissions
HRO-OFDM symbols all the way are respectively transformed to by mixing IFFT modes, two-way HRO-OFDM symbols are after parallel-serial conversion
The corresponding LED that is transmitted to emitting outward on antenna；
For receiving two-way HRO-OFDM symbols, phase is obtained by serioparallel exchange with mixing IFFT modes for receiver base band
The symbol for the VLC link transmissions answered and the symbol of RF link transmissions, then by demodulating with being transmitted to after bandwidth power merging treatment
The bit stay of two nights；Meanwhile receiver base band also carries out channel estimation to subcarrier each in RF links and VLC links and feeds back to hair
Machine base band is penetrated, the bandwidth power method of salary distribution is adjusted according to these feedback informations by transmitter base band.
In the embodiment of the present invention, the transmitter base band mainly includes：Bandwidth power distributor, modulation mapper,
Hermitian conjugate modules, mixing IFFT modules, parallel-to-serial converter, LED and transmitting antenna；Wherein：
The bandwidth power distributor, for according to CSI (Channel State Information, channel status letter
Cease) use the number of sub carrier wave that the calculating of HRO-OFDM optimization methods should use and selected each subcarrier with user bandwidth
The power distributed is needed, then the bit long placed on each selected subcarrier is calculated by Levin-Campello algorithms
Degree；Finally, the bit sequence of input is split into different length and is sent to modulation mapper；It is additionally operable to anti-with reference to receiver base band
The HRO-OFDM optimization methods adjustment bandwidth power method of salary distribution that the channel estimation results of feedback use；
The Bit String of different length for identifying the Bit String of different length, is modulated into difference by the modulation mapper
Symbol, so as to obtain the symbol of the symbol of VLC link transmissions and RF link transmissions；
Hermitian conjugate modules, for carrying out Hermitian conjugation processing to the symbol of VLC link transmissions；
IFFT modules are mixed, the symbol of the RF link transmissions for being exported to modulation mapper is conjugated mould with Hermitian
The symbol of the VLC link transmissions of block output carries out IFFT processing respectively, exports two-way HRO-OFDM symbols；
Parallel-to-serial converter for adding cyclic prefix to two-way HRO-OFDM symbols respectively, and does parallel-serial conversion processing, most
It is corresponding afterwards to be emitted outward with antenna by LED.
In the embodiment of the present invention, the receiver base band mainly includes：Bandwidth power combiner, mixes demodulation de-mapping device
Close FFT module, deserializer, photodiode and reception antenna；Wherein：
Deserializer, the two-way HRO-OFDM symbols for photodiode and reception antenna to be received are gone here and there and are turned
It changes and mixes FFT module with being sent into after removal circulation prefix processing；
FFT module is mixed, FFT transform processing is done respectively for the two paths of data to input, obtains two-way HRO-OFDM symbols
Number；
De-mapping device is demodulated, the bit of different length is reduced into for passing through demodulation mode by two-way HRO-OFDM symbols
String；It is additionally operable to carry out channel estimation to subcarrier each in RF links and VLC links；
Bandwidth power combiner, for calculating transmitter using HRO-OFDM optimization methods according to CSI and user bandwidth
Allocation strategy used by bandwidth power distributor in base band, and according to the allocation strategy be merged into the Bit String of fractionation original
Bit sequence.
In the embodiment of the present invention, bandwidth power distributor and HRO-OFDM optimization methods used in bandwidth power combiner
It is as follows：
In the embodiment of the present invention, feedback channel feedback is current CSI.Since transmitter base band does not know CSI, so
The CSI feedback that receiver base band needs to estimate is to transmitter.In specific implementation, it operates as follows：Transmitter baseband transmission
Training sequence (i.e. sequence known to a string of both sides) to receiver base band, receiver base band is worked as by demodulating de-mapping device and calculating
The CSI of preceding estimation.Then the CSI of estimation is sent to transmitter base band by receiver base band by RF links, meanwhile, it is relevant
CSI is also transmitted directly to bandwidth power combiner；Later, bandwidth power distributor can be used with bandwidth power combiner
HRO-OFDM optimization methods.
Bandwidth power distributor in transmitter base band calculates RF links and VLC links using HRO-OFDM optimization methods
In optimal subcarrier and abandon remaining subcarrier, be that optimal subcarrier carries out power distribution later, finally, complete power
Watt level is converted into bit number by the subcarrier of distribution using Levin-Campello algorithms.
In the embodiment of the present invention, watt level is converted into bit number using Levin-Campello algorithms namely is used
The watt level that each subcarrier distributes is converted into the number (or length) of bit by Levin-Campello algorithms, then will
The Bit String of input is split, and is split into different numbers (length) and is distributed to corresponding subcarrier.
In the embodiment of the present invention, bandwidth power distributor is required for using HRO-OFDM optimization sides with bandwidth power combiner
Method.The reason is that the use of the final purpose of HRO-OFDM optimization methods is that should be assigned on each subcarrier in order to obtain
Number of bits (or length).When bandwidth power distributor is calculated by the CSI of feedback using HRO-OFDM optimization methods
During number of bits (or length) that each subcarrier should distribute, bandwidth power combiner can not learn the meter of transmitter base band
Calculate result, then the data received can not just be reduced into correct bit sequence.Therefore, bandwidth power combiner is also required to lead to
It crosses CSI and calculates the number of bits (or length) that each subcarrier should distribute using HRO-OFDM optimization methods, come with this
Ensure that receiver can correctly restore bit sequence.
It will be understood by those skilled in the art that either transmitter base band or receiver base band all include complete set
Communications baseband, i.e. transmitter base band are provided with data transmit-receive function with receiver base band, such as mobile phone or wireless router one
Sample both can also receive data with transmission data.
In order to illustrate the performance of the present invention, performance simulation experiment is also carried out, the results are shown in Figure 4.
Simulation parameter：The area in spacious room is 25 square metres；Effective area of detection of photodiode is 1 square li
Rice；The half-power angle of light emitting diode is 70 degree；The visual range of receiver is 70 degree；The average reflection coefficient of indoor wall is
0.63；The cutoff frequency of light emitting diode is 20MHz；Indoor multipath number is 4.
Abscissa is air line distance of the base band apart from user in Fig. 4, and ordinate is user rate, which shows more greatly base
The performance of band is better, and rate is higher；Middle parameter B represents total bandwidth on Fig. 4；The parameter B of subscripting RF, VLC represent corresponding link
The bandwidth of occupancy.In the case of equal-wattage and bandwidth, of the invention and traditional RF-OFDM base band and traditional mixing
VLC/RF access dot systems are compared.No matter how the distance of user and base band changes, and performance of the invention is always maintained at most
It is good.Meanwhile invented HRO-OFDM optimization methods are benefited from, the present invention accesses dot system meeting unlike traditional mixing VLC/RF
There are the attenuation of rate after 3.5 meters, HRO-OFDM optimization methods allow power with bandwidth allocation in RF links and VLC
Certain balance is kept in link, when VLC links cause attenuation since visual range is limited, by the bandwidth of VLC chains road point
It is fitted on RF chains road so that it is same level that rate, which can be maintained at individual RF-OFDM base band, under the performance for avoiding system
Drop.
Therefore, the present invention realizes the structure design of VLC/RF mixing OFDM base band, and can optimize by HRO-OFDM
Method causes user rate further to be promoted, better than existing RF-OFDM base band, VLC-OFDM base band and traditional mixing
VLC/RF accesses dot system.
The foregoing is only a preferred embodiment of the present invention, but protection scope of the present invention be not limited thereto,
Any one skilled in the art is in the technical scope of present disclosure, the change or replacement that can readily occur in,
It should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Subject to enclosing.
Claims (4)
1. a kind of VLC/RF mixes OFDM baseband system, which is characterized in that including：Transmitter base band and receiver base band；Wherein：
Transmitter base band is distributed for carrying out bandwidth power to the bit sequence of input with exporting distinct symbols after modulation, comprising
The symbol of VLC link transmissions and the symbol of RF link transmissions, the symbols of VLC link transmissions are logical with the symbol of RF link transmissions
It crosses mixing IFFT modes and is respectively transformed to HRO-OFDM symbols all the way, two-way HRO-OFDM symbols are corresponding after parallel-serial conversion
Be transmitted to LED with emitting outward on antenna；
Receiver base band, for receiving two-way HRO-OFDM symbols, by serioparallel exchange with mixing IFFT modes obtain it is corresponding
The symbol of VLC link transmissions and the symbol of RF link transmissions, then by being transmitted to bit after demodulation and bandwidth power merging treatment
The stay of two nights；Meanwhile receiver base band also carries out channel estimation to subcarrier each in RF links and VLC links and feeds back to transmitter
Base band adjusts the bandwidth power method of salary distribution by transmitter base band according to these feedback informations.
A kind of 2. VLC/RF mixing OFDM baseband system according to claim 1, which is characterized in that the transmitter base band
Including：Bandwidth power distributor, modulation mapper, Hermitian conjugate modules, mixing IFFT modules, parallel-to-serial converter, LED
With transmitting antenna；Wherein：
The bandwidth power distributor, for that should be used using the calculating of HRO-OFDM optimization methods according to CSI and user bandwidth
The power that is distributed with selected each subcarrier needs of number of sub carrier wave, then calculated by Levin-Campello algorithms
The bit length each placed on selected subcarrier；Finally, the bit sequence of input is split into different length to be sent to
Modulation mapper；It is additionally operable to the HRO-OFDM optimization methods adjustment band used with reference to the channel estimation results of receiver baseband feedback
Wide power distribution mode；
The Bit String of different length for identifying the Bit String of different length, is modulated into different symbols by the modulation mapper
Number, so as to obtain the symbol of the symbol of VLC link transmissions and RF link transmissions；
Hermitian conjugate modules, for carrying out Hermitian conjugation processing to the symbol of VLC link transmissions；
IFFT modules are mixed, it is defeated for the symbols of RF link transmissions and Hermitian conjugate modules that are exported to modulation mapper
The symbol of VLC link transmissions gone out carries out IFFT processing respectively, exports two-way HRO-OFDM symbols；
Parallel-to-serial converter for adding cyclic prefix to two-way HRO-OFDM symbols respectively, and does parallel-serial conversion processing, finally right
That answers is emitted outward by LED with antenna.
A kind of 3. VLC/RF mixing OFDM baseband system according to claim 1, which is characterized in that the receiver base band
Including：Bandwidth power combiner, demodulation de-mapping device, mixing FFT module, deserializer, photodiode and reception antenna；
Wherein：
Deserializer, for by the two-way HRO-OFDM symbols that photodiode and reception antenna receive do serioparallel exchange with
Mixing FFT module is sent into after removing circulation prefix processing；
FFT module is mixed, FFT transform processing is done respectively for the two paths of data to input, obtains two-way HRO-OFDM symbols；
De-mapping device is demodulated, the Bit String of different length is reduced into for passing through demodulation mode by two-way HRO-OFDM symbols；Also
For carrying out channel estimation to subcarrier each in RF links and VLC links；
Bandwidth power combiner, for calculating transmitter base band using HRO-OFDM optimization methods according to CSI and user bandwidth
Allocation strategy used by middle bandwidth power distributor, and the Bit String of fractionation is merged into original ratio according to the allocation strategy
Special sequence.
4. a kind of VLC/RF mixing OFDM baseband systems according to claims 1 or 2 or 3, which is characterized in that by transmitter
Base band adjusts the bandwidth power method of salary distribution according to these feedback informations and includes：
Bandwidth power distributor in transmitter base band is calculated in RF links and VLC links most using HRO-OFDM optimization methods
Excellent subcarrier simultaneously abandons remaining subcarrier, is that optimal subcarrier carries out power distribution later, finally, completes power distribution
Subcarrier watt level is converted into bit number using Levin-Campello algorithms.
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| CN201810065011.6A CN108259403A (en) | 2018-01-23 | 2018-01-23 | A kind of VLC/RF mixes OFDM baseband system |
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| CN201810065011.6A CN108259403A (en) | 2018-01-23 | 2018-01-23 | A kind of VLC/RF mixes OFDM baseband system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110336608A (en) * | 2019-06-28 | 2019-10-15 | 清华大学 | Photoelectricity mixing monochromatic network broadcast method and system |
| US20220116111A1 (en) * | 2019-06-28 | 2022-04-14 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Data Transmission Device of Mobile Terminal, and Mobile Terminal |
| CN115225205A (en) * | 2022-07-07 | 2022-10-21 | 中国科学院空间应用工程与技术中心 | VLC-RF hybrid communication method, system, medium, and device |
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| CN103220760A (en) * | 2013-04-24 | 2013-07-24 | 吉林大学 | OW-RF fusion system and cross-domain communication method based on same |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110336608A (en) * | 2019-06-28 | 2019-10-15 | 清华大学 | Photoelectricity mixing monochromatic network broadcast method and system |
| WO2020258410A1 (en) * | 2019-06-28 | 2020-12-30 | 清华大学 | Photoelectric hybrid single-frequency network broadcasting method and system |
| US20220116111A1 (en) * | 2019-06-28 | 2022-04-14 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Data Transmission Device of Mobile Terminal, and Mobile Terminal |
| EP3979607A4 (en) * | 2019-06-28 | 2022-08-24 | Guangdong Oppo Mobile Telecommunications Corp., Ltd. | Data transmission device of mobile terminal, and mobile terminal |
| CN115225205A (en) * | 2022-07-07 | 2022-10-21 | 中国科学院空间应用工程与技术中心 | VLC-RF hybrid communication method, system, medium, and device |
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