CN205986877U - It is thus clear that optical locating hardware systems based on CDMARF fuses communication - Google Patents
It is thus clear that optical locating hardware systems based on CDMARF fuses communication Download PDFInfo
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- CN205986877U CN205986877U CN201620913078.7U CN201620913078U CN205986877U CN 205986877 U CN205986877 U CN 205986877U CN 201620913078 U CN201620913078 U CN 201620913078U CN 205986877 U CN205986877 U CN 205986877U
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Abstract
The utility model discloses an it is thus clear that optical locating hardware systems based on CDMARF fuses communication, including modulation module, emission module, transport module, receiving module and demodulation module, the modulation module is used for realizing QPSK modulation, the modulation of OOK baseband and CDMA spread spectrum, emission module includes LED drive circuit, LED lamps and lanterns and emit antenna, transport module includes optical channel and radio frequency channel among the free space, receiving module includes photodetecting device, radio signal recepition machine, adaptive filtering circuit and amplifier circuit, demodulation module is used for realizing that OOK demodulation, QPSK separate the despreading of mediation CDMA. The utility model discloses not only improve the precision of location far away, has not needed to launch in step the signal moreover, the utility model discloses system simple structure has improved the robustness of system greatly, has wide market prospect and application space.
Description
Technical field
This utility model is related to a kind of visible ray localization method, particularly to a kind of based on CDMA/RF converged communication can
See light projection hardware system.
Background technology
With the raising of living standards of the people and economic and science and technology continuous development, people are to navigation and positioning service
Demand increasingly increase.Global position system GPS wide coverage, positioning precision are high, function is complete, technology maturation, but due to
The signal of gps satellite transmitting effectively can not pass through building, causes it can not carry out precise positioning in a lot of indoor environments.
In recent years it is seen that optical communication technique has caused the concern of lot of domestic and foreign experts and scholars, VLC is in multiple fields
Have and set foot in, and obtain certain progress, such as the proposition of LiFi.The possible application prospect of visible light communication includes indoor short distance no
Line access, indoor positioning, intelligent traffic network under urban environment etc..If it will be seen that optical communication technique is applied to position, with
Traditional location technology is compared to be had many advantages, such as, such as no electromagnetic interference, add-on module is few, positioning precision is high, good confidentiality, and
Gu Tongxin and illumination etc..This makes visible ray localization method in widespread attention.
However, optical channel is easily disturbed by weather conditions and ambient light, when time link down in barrier.And,
Due to the presence of multipath effect and the intersymbol interference of different LED lamp, the precision of positioning is had a greatly reduced quality.
Utility model content
In order to overcome disadvantages mentioned above and the deficiency of prior art, the purpose of this utility model is to provide one kind to be based on
The visible ray location hardware system of CDMA/RF converged communication.
The purpose of this utility model is achieved through the following technical solutions.
A kind of visible ray location hardware system based on CDMA/RF converged communication, including modulation module, transmitter module, biography
Defeated module, receiver module and demodulation module；
Described modulation module is used for realizing QPSK modulation, OOK baseband modulation and CDMA spread spectrum；Described transmitter module includes
LED drive circuit, LED lamp and transmitting antenna；Described transport module includes optical channel and radio-frequency channel in free space；Institute
State receiver module and include photoelectricity testing part, wireless signal receiver, auto-adaptive filter circuit and amplifying circuit；Described solution mode transfer
Block is used for realizing OOK demodulation, QPSK demodulation CDMA despreading.
Further, described modulation module includes QPSK modulation module, OOK baseband-modem module, CDMA spread spectrum module.
Further, described transport module includes the optical channel in free space and radio-frequency channel, and optical channel is used for transmitting
Optical signal, radio-frequency channel is used for transmitting radio frequency signal.
Further, described receiver module include photoelectricity testing part, wireless signal receiver, auto-adaptive filter circuit and
Amplifying circuit, described photoelectricity testing part receive through free space reach have LED lamp id information optical signal and
Be converted to the signal of telecommunication, described wireless signal receiver receives the radiofrequency signal in radio-frequency channel and is converted to the signal of telecommunication, two-way electricity
Signal filters off noise after adaptive-filtering and processing and amplifying, obtains useful signal.
Compared with prior art, this utility model has advantages below and beneficial effect：
（1）This utility model structure is simple, by using the orthogonality of spreading code in CDMA modulation technique, is overcoming code
Between disturb while, increased the capacity of channel, improve communication quality.
（2）This utility model utilizes the stability of RF communication, is not easily susceptible to the interference of environmental factorss, is capable of stable
Communication.
（3）This utility model solves pure visible light communication system in the restriction of coverage and deficiency, maintains
The ability of its communication based on positioning, provides more preferable Consumer's Experience in terms of navigation and positioning service.
（4）This utility model is positioned using the directivity of visible light communication and the stability of radio communication, mixing unit
Two kinds of different communication technologys of administration, realize technology complementation.
Brief description
Fig. 1 is a kind of schematic diagram of visible ray location hardware system based on CDMA/RF converged communication of the present utility model.
Specific embodiment
With reference to embodiment and accompanying drawing, this utility model is described in further detail, but reality of the present utility model
Apply mode not limited to this, it is noted that of the present utility model it is critical only that the technical scheme that hardware components are proposed, be related to soft
Part is all partly that those skilled in the art can refer to prior art realization.
Embodiment 1
As shown in figure 1, a kind of visible ray alignment system based on CDMA/RF converged communication, including modulation module, transmitting mould
Block, transport module, receiver module, demodulation module.
Described modulation module includes QPSK modulation, OOK baseband modulation and CDMA spread spectrum.Described transmitter module includes LED and drives
Galvanic electricity road, LED lamp and transmitting antenna.Described transport module includes optical channel and radio-frequency channel in free space.Described connect
Receive module and include photoelectricity testing part, wireless signal receiver, auto-adaptive filter circuit and amplifying circuit.Described demodulation module bag
Include OOK demodulation, QPSK demodulation CDMA despreading.
As a kind of example, described modulation module includes QPSK modulation module, OOK baseband-modem module, CDMA spread spectrum mould
Block.QPSK has four constellation positions, in actual realization, 00 is mapped as -1-1i, 01 is mapped as -1+1i, and 10 are mapped
For 1+1i, 11 are mapped as 1+1i, and are multiplied by normalization factor.QPSK adopts 4 system PSK modulation, and every kind of phase place can represent two
Position binary information, its code efficiency is higher.OOK modulation with unipolarity NRZ sequence to control the unlatching of sinusoidal carrier with
Close, there is simple energy-conservation.CDMA spread spectrum, will be through baseband modulation using channelization code, base station code and user code
PN specific with the user code-phase of signal afterwards is taken advantage of and is spread.Described PN code adopts m sequence as the coding of channel, Walsh sequence
Row are as geocoding.Described Walsh code can be produced by hadamard matrix, and one group of generation has the two of good correlation and enters
Sequence processed.
Signal through QPSK modulation and OOK modulation is carried out CDMA spread spectrum by described modulation module, and concrete operations are to modulate
Signal afterwards and user's specific PN code-phase are taken advantage of and are spread, and described PN code adopts m sequence as the coding of channel, Walsh sequence
Row are as geocoding.Described Walsh code can be produced by hadamard matrix, and one group of generation has the two of good correlation and enters
Sequence processed.Meanwhile, the data after QPSK being modulated is sent and is given transmitting antenna, and carries out CDMA spread spectrum using identical PN code simultaneously.
Described transport module includes optical channel and radio-frequency channel in free space, and optical channel is used for transmitting optical signal, penetrates
Frequency channel is used for transmitting radio frequency signal.Radio-frequency channel has higher coverage so that it covers almost whole space.Only
The ID of LED, is transmitted by optical channel, solves Radio frequency interference and the visible ray interference of adjacent signals using CDMA.
Described receiver module includes photoelectricity testing part, wireless signal receiver, auto-adaptive filter circuit and amplifying circuit,
Described photoelectricity testing part receives to be had the optical signal of LED lamp id information and is converted to telecommunications through what free space reached
Number, described wireless signal receiver receives the radiofrequency signal in radio-frequency channel and is converted to the signal of telecommunication.Described two path signal warp
Filter off noise after crossing adaptive-filtering and processing and amplifying, obtain useful signal.
Further, the signal after band spectrum modulation is loaded on drive circuit respectively, drives LED and transmitting antenna to send out respectively
Optical signal and radiofrequency signal, optical signal and radiofrequency signal is sent all to be loaded with CDMA spreading code.
Further, the optical channel in free space and radio-frequency channel, transmission optical signal and radiofrequency signal respectively.Radio frequency is believed
Road has higher coverage so that it covers almost whole space.The only ID of LED is transmitted by optical channel, phase
Radio frequency interference between adjacent signal and visible ray interference can be solved using CDMA.
Further, described photoelectricity testing part receiving light transmission comes optical signal simultaneously makees light-to-current inversion, by light
Signal is converted into the signal of telecommunication.Described wireless signal receiver receives the radiofrequency signal that radio-frequency channel transmits and by radiofrequency signal
It is converted into the signal of telecommunication.Further, two path signal is filtered and amplifies by described auto-adaptive filter circuit and amplifying circuit,
Filter off noise and amplify useful signal.
Further, the optical signal that optical signal receiving terminal receives is carried out OOK demodulation by demodulation module, then by wireless signal
Signal after radiofrequency signal that receiving terminal receives and the aforementioned demodulation through OOK together carries out QPSK demodulation, then carries out CDMA solution
After expansion, the effective informations such as the signal arrival time difference of ID, receiving terminal and transmitting terminal of LED can be obtained.Further, utilize
TOA algorithm is accurately calculated to the position of receiving terminal can achieve precise positioning.This system has broad mass market prospect, can answer
For museum, market, dining room and intelligent transportation system etc..
As a kind of specifically visible light projection of example, comprise the following steps：
Step 1, the id information to each LED lamp carry out QPSK modulation, OOK modulation and CDMA modulation, the letter after modulation
Number drive LED lamp send optical signal;Meanwhile, the radiofrequency signal through QPSK modulation for the transmitting antenna transmitting, this radiofrequency signal is synchronous
Carry CDMA spreading code;
Step 2, optical signal transmit through optical channel, and radiofrequency signal is through radio-frequency channel transmission, optical channel and radio-frequency channel
It is respectively positioned on free space;
Step 3, the photoelectricity testing part of receiving terminal receive after the visible light signal of each LED lamp, through corresponding
Signal processing obtain id information;
Step 4, the orthogonality according to spreading code, receiving terminal is using the corresponding spread spectrum of the ID obtaining with this optical channel
Code is de-spreading the radiofrequency signal in radio-frequency channel, and then the accurate calculating of the receiving end position that achieves a butt joint.
Described step 1 comprises the following steps：
Step 11, the id information to each LED lamp carry out QPSK modulation and OOK baseband modulation, the signal after modulation
Carry a width of B1;
Step 12, above-mentioned modulated signal is carried out after spread spectrum operation through PN code generator, formed and carry a width of B2Expansion
Frequency signal, and B2Much larger than B1.
Described step 1 is further comprising the steps of：
Step 21, QPSK modulation is carried out to original radiofrequency signal；
Step 22, the CDMA spread processing that the signal modulated through QPSK is synchronized.
Described step 3 comprises the following steps：
Step 31, the photoelectricity testing part of described visible light signal receiving end receive, and form electricity after light-to-current inversion
Signal；
Step 32, the described signal of telecommunication filter off noise through sef-adapting filter, more amplified processing of circuit obtains and effectively believes
Number；
Step 33, CDMA despreading module catch the PN code that LED light fixture is launched by built-in synchronous circuit
Accurate phase, thus produces the PN code consistent with transmitting terminal phase place and carries out despreading process with the signal before described despreading, reduction
Go out ID information.
Described step 4 comprises the following steps：
After step 51, receiving terminal receive described radiofrequency signal, corresponding using the id information obtaining with optical channel
Spreading code is de-spreading the signal in radio-frequency channel；
Step 52, receiving terminal are provided with time detection device, obtain receiving terminal and transmitting terminal when signal reaches receiving terminal
Signal arrival time difference, recycles TOA algorithm that the position of receiving terminal is accurately calculated.
Above-described embodiment is only a kind of embodiment of the present utility model, but embodiment of the present utility model is not subject to
State the restriction of embodiment, other any without departing from the change made under spirit of the present utility model and principle, modify, replace
Generation, combination, simplification all should be equivalent substitute mode, are included within protection domain of the present utility model.
Claims (4)
1. a kind of visible ray alignment system based on CDMA/RF converged communication is it is characterised in that include modulation module, transmitting mould
Block, transport module, receiver module and demodulation module；Described modulation module is used for realizing QPSK modulation, OOK baseband modulation and CDMA
Spread spectrum；Described transmitter module includes LED drive circuit, LED lamp and transmitting antenna；Described transport module is included in free space
Optical channel and radio-frequency channel；Described receiver module includes photoelectricity testing part, wireless signal receiver, auto-adaptive filter circuit
And amplifying circuit；Described demodulation module is used for realizing OOK demodulation, QPSK demodulation CDMA despreading.
2. the visible ray alignment system based on CDMA/RF converged communication according to claim 1 is it is characterised in that described tune
Molding block includes QPSK modulation module, OOK baseband-modem module, CDMA spread spectrum module.
3. the visible ray alignment system based on CDMA/RF converged communication according to claim 1 is it is characterised in that described biography
Defeated module includes optical channel and radio-frequency channel in free space, and optical channel is used for transmitting optical signal, and radio-frequency channel is used for transmitting
Radiofrequency signal.
4. the visible ray alignment system based on CDMA/RF converged communication according to claim 1 is it is characterised in that described connect
Receive module and include photoelectricity testing part, wireless signal receiver, auto-adaptive filter circuit and amplifying circuit, described photoelectric detector
Part receives to be had the optical signal of LED lamp id information and is converted to the signal of telecommunication through what free space reached, described wireless communication
Number receiver receives the radiofrequency signal in radio-frequency channel and is converted to the signal of telecommunication, and two path signal is through adaptive-filtering and amplification
Filter off noise after process, obtain useful signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620913078.7U CN205986877U (en) | 2016-08-20 | 2016-08-20 | It is thus clear that optical locating hardware systems based on CDMARF fuses communication |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620913078.7U CN205986877U (en) | 2016-08-20 | 2016-08-20 | It is thus clear that optical locating hardware systems based on CDMARF fuses communication |
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| CN205986877U true CN205986877U (en) | 2017-02-22 |
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| CN201620913078.7U Expired - Fee Related CN205986877U (en) | 2016-08-20 | 2016-08-20 | It is thus clear that optical locating hardware systems based on CDMARF fuses communication |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110855314A (en) * | 2019-11-19 | 2020-02-28 | 中国矿业大学 | Convergent VLC-RF system |
| CN112291001A (en) * | 2020-10-23 | 2021-01-29 | 军事科学院系统工程研究院网络信息研究所 | Electro-optical double-carrier mutual check free space communication method |
-
2016
- 2016-08-20 CN CN201620913078.7U patent/CN205986877U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110855314A (en) * | 2019-11-19 | 2020-02-28 | 中国矿业大学 | Convergent VLC-RF system |
| CN112291001A (en) * | 2020-10-23 | 2021-01-29 | 军事科学院系统工程研究院网络信息研究所 | Electro-optical double-carrier mutual check free space communication method |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20170222 Termination date: 20190820 |