CN111628825A - Single-light-source full-duplex visible light communication system - Google Patents

Single-light-source full-duplex visible light communication system Download PDF

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CN111628825A
CN111628825A CN202010328659.5A CN202010328659A CN111628825A CN 111628825 A CN111628825 A CN 111628825A CN 202010328659 A CN202010328659 A CN 202010328659A CN 111628825 A CN111628825 A CN 111628825A
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optical
light source
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light
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刘聪
任万楼
邓宏亮
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Qiqu Interconnection Beijing Technology Co ltd
SUN KAISENS (BEIJING) TECHNOLOGY CO LTD
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Qiqu Interconnection Beijing Technology Co ltd
SUN KAISENS (BEIJING) TECHNOLOGY CO LTD
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/11—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
    • 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
    • H04B10/50—Transmitters
    • H04B10/501—Structural aspects
    • H04B10/502—LED transmitters
    • 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
    • H04B10/50—Transmitters
    • H04B10/516—Details of coding or modulation

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Abstract

The invention provides a single light source full duplex visible light communication system, comprising: the signal processing module is used for encrypting, coding and modulating a signal to be transmitted and loading the processed signal to be transmitted to the LED driving module; the LED driving module loads the processed signal to be transmitted to an LED light source; the LED light source is used for emitting a signal to be transmitted in a light form and transmitting the signal in an atmospheric channel; the reverse driving module is used for loading the processed signal to be transmitted to the reverse modulator; the reverse modulator is used for carrying out secondary modulation on the optical signal of the downlink, modulating the uplink information to a downlink optical path and reflecting the uplink information to the active end; the second signal processing module decrypts, decodes and demodulates the signal. The invention adopts a cat eye structure and combines a piezoelectric ceramic telescopic material to manufacture the optical reverse modulator, and the modulator has the advantages of large field angle, lower cost and good response in the whole visible light spectrum range.

Description

Single-light-source full-duplex visible light communication system
Technical Field
The invention relates to the technical field of visible light communication, in particular to a single-light-source full-duplex visible light communication system.
Background
Visible light communication is a new communication mode, it utilizes high-speed bright and dark flashing signal that the naked eye can't see that fluorescent lamp or luminescent diode, etc. send out to transmit information, connect the electric wire apparatus of the high-speed Internet on the illuminator, insert the power plug to use, the system made of this technology can cover the range that the indoor light reaches, the computer does not need the electric wire to connect, therefore have extensive development prospect, compare with wireless local area network (wireless LAN) used at present, the "visible light communication" system can utilize the indoor lighting apparatus to replace the wireless LAN base station to transmit the signal, its communication speed can reach dozens of megabits per second to hundreds megabits, the future transmission speed can exceed the optical fiber communication, utilize the specialized computer and mobile information terminal that can send and receive the signal function, as long as in the place that the indoor light shines, can download and upload the data such as high-definition portrait and cartoon, etc. for a long time, the system also has the characteristic of high safety, the information cannot be leaked to the outside by shielding light with a curtain, the communication speed cannot be influenced by using a plurality of computers, and the system can be freely used by departments such as hospitals sensitive to electromagnetic signals and the like because radio wave communication is not used.
In a backward modulation system, an angular cone prism reflection type and a cat eye structure echo modulation type are two different backward modulators. Among the modulation devices, there are three types of piezoelectric ceramic telescopic materials, ferroelectric liquid crystal modulators, MEMS type modulators, and optical quantum well type modulators. The corner reflector type inverse modulator does not have a focusing characteristic, and has a small angle of view, and a high demand for an angle of an incident beam. Compared with the pyramid prism reflection type, the echo modulator with the cat eye structure has the advantages of large field angle and simple structure, and is suitable for a communication system with a large beam divergence angle, such as indoor visible light communication. In the modulation device, the ferroelectric liquid crystal modulator suffers from slow switching rate of the liquid crystal state and non-ideal modulation effect. The MEMS type modulator and the photon trap type modulator have high cost and great technical difficulty, are still in experiments at home at present, have very strict limitation on wavelength and are not suitable for visible light communication.
Disclosure of Invention
The object of the present invention is to solve at least one of the technical drawbacks mentioned.
Therefore, the invention aims to provide a single light source full-duplex visible light communication system.
In order to achieve the above object, an embodiment of the present invention provides a single light source full duplex visible light communication system, including: a first signal processing module, an LED driving module, an LED light source, an optical transmitting front end, an optical receiving front end, a reverse driving module, a reverse modulator and a second signal processing module,
the signal processing module is used for encrypting, coding and modulating a signal to be transmitted, and loading the processed signal to be transmitted to the LED driving module so as to convert the processed signal to be transmitted into an electric signal suitable for driving an LED light source;
the LED driving module is used for loading the processed signal to be transmitted to the LED light source;
the LED light source is used for emitting the signal to be transmitted in a light form and transmitting the signal in an atmospheric channel;
the optical emission front end is used for emitting and enhancing optical signals;
the optical receiving front end is used for converging and enhancing the optical signal processed by the optical transmitting front end, and then the photoelectric detection module is used for carrying out photoelectric conversion processing on the optical signal;
the second signal processing module is used for decrypting, decoding and demodulating the electric signal after photoelectric conversion, and carrying out signal processing of encrypting, coding and modulating on information to be fed back;
the reverse driving module is used for loading the processed signaling to be transmitted to the reverse modulator;
the reverse modulator is used for modulating the optical signals of the downlink for the second time, modulating the uplink information to a downlink light path to be reflected to the active end, and transmitting the signaling to be transmitted to an atmospheric channel in the form of light by reflecting the downlink optical signals;
and then the first signal processing module decrypts, decodes and demodulates the signal processed by the inverse modulator.
Further, the inverse modulator secondarily modulates the optical signal of the uplink, including:
let the downlink modulated optical signal a (t) be Pta(1+Amcos(ω0t+θk) In which A) ismcos(ω0t+θk) K is 1,2,3 … M, which is an M-ary PSK modulated signal expression;
setting the uplink modulation signal as e (t), using the following uplink optical signal as carrier, modulating the uplink signal by using a reverse modulator, multiplying the uplink signal by the downlink received signal, and obtaining a signal after secondary modulation, wherein s (t) is:
S(t)＝Pta[1+Amcos(ω0t+θk)]×e(t)
＝Ptae(t)+Amcos(ω0t+θk)e(t)。
further, when the uplink signal adopts the modulation format of MFSK, its modulation signal e (t) can be expressed as:
Figure BDA0002464148500000021
wherein, an∈ {00,01,10,11}, Δ ω represents the frequency difference between different carriers, θ is the initial phase, g (T) is a representation of a single pulse of the baseband signal, and T is the pulse width.
Further, the signal after the second modulation contains Ptae (t) and Amcos(ω0t+θk) e (t) two components, when ω0＞＞ωcWhen the frequency spectrum of the uplink communication link and the frequency spectrum of the downlink communication link are different, the band-pass filter extracts the uplink signal component from the signal after the secondary modulation.
Furthermore, the reverse modulator is made of a piezoelectric ceramic telescopic material.
Furthermore, a light reflecting surface is arranged on the light incident side of the inverse modulator.
Further, still include: a directional transmission channel, wherein the directional transmission channel is provided with an optical receiver and a receiving end photoelectric detection module,
the optical receiver is used for receiving direct light from the transmitting end and the channel direct current gain H of the direct light signald(0) Can be expressed as:
Figure BDA0002464148500000031
where m is the radiation pattern of the light source, A is the receiving area of the photodetection module, DdIs the channel transmission distance, phi is the angle of incidence,
Figure BDA0002464148500000032
is the beam divergence angle of the LED,
Figure BDA0002464148500000033
is the gain of the optical filter and is,
Figure BDA0002464148500000034
is the FOV of the receiver and is,
Figure BDA0002464148500000035
is a focus gain of the photo-detection module, wherein
Figure BDA0002464148500000036
Can be expressed as:
Figure BDA0002464148500000037
let the emission power of the LED emission end be PtThe optical power P received by the receiver after transmission through the directional channelrComprises the following steps:
Pr＝PtHd(0)。
further, in the upstream directionIn the channel of the communication link, the receiving end receives the illumination intensity R of the surface of the photoelectric detection moduleu(t) can be expressed as:
Ru(t)＝Pra[1+Amcos(ω0t+θk)]×e(t)+Pamb
in the formula PraFor the average optical power of the incident signal light of the detector, cos (omega)0t+θk) For modulating signals for the downlink, PambFor background light power, e (t) is an uplink modulation signal, and when the sensitivity of the detector is R, the output current y (t) of the receiving-end photodetection module can be expressed as:
Y(t)＝R(Pra×e(t)+Pamb)+R×Pra×Amcos(ω0t+θk)×e(t)。
according to the single-light-source full-duplex visible light communication system, the LED driving module is used for mainly loading a processed signal to be transmitted to the LED light source, the LED light source sends the signal to be transmitted in a light form and transmits the signal in an atmospheric channel, the reverse driving module is used for loading the processed signal to be transmitted to the reverse modulator, and the reverse modulator is used for mainly reflecting a downlink light signal and sending the signal to be transmitted to the atmospheric channel in the light form. The invention adopts a cat eye structure and combines a piezoelectric ceramic telescopic material to manufacture the optical reverse modulator, and the modulator has the advantages of large field angle, lower cost and good response in the whole visible light spectrum range.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a block diagram of a single light source full duplex visible light communication system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a single light source full duplex visible light communication system according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
As shown in fig. 1 and fig. 2, a single light source full duplex visible light communication system according to an embodiment of the present invention includes: the LED light source module comprises a first signal processing module, an LED driving module, an LED light source, an optical transmitting front end, an optical receiving front end, a reverse driving module, a reverse modulator and a second signal processing module.
The first signal processing module is used for encrypting, coding and modulating signals to be transmitted and loading the processed signals to be transmitted to the LED driving module so as to convert the signals into electric signals suitable for driving the LED light source.
The LED driving module is used for loading the processed signals to be transmitted to the LED light source.
The LED light source is used for emitting a signal to be transmitted in a light form and transmitting the signal in an atmospheric channel.
The optical transmission front end is used for transmitting and enhancing the optical signal.
The optical receiving front end is used for converging and enhancing the optical signal processed by the optical transmitting front end, and then the photoelectric detection module is used for carrying out photoelectric conversion processing on the optical signal.
The second signal processing module is used for carrying out decryption, decoding and demodulation processing on the electric signal subjected to photoelectric conversion, and carrying out signal processing of encryption, coding and modulation on information to be fed back.
The reverse driving module is used for loading the processed signaling to be transmitted to the reverse modulator.
The reverse modulator is used for performing secondary modulation on the optical signal of the downlink, modulating the uplink information to a downlink optical path and reflecting the downlink optical signal to the active end, and transmitting the signaling to be transmitted to an atmospheric channel in an optical mode by reflecting the downlink optical signal. And then the first signal processing module decrypts, decodes and demodulates the signal processed by the inverse modulator.
In an embodiment of the present invention, the inverse modulator is made of a piezoelectric ceramic material. A light reflecting surface is arranged on the light incident side of the reverse modulator.
The second signal processing module decrypts, decodes and demodulates the signal.
The inverse modulator modulates the optical signal twice, comprising the following steps:
downlink modulated optical signal a (t) ═ Pta(1+Amcos(ω0t+θk))，
Wherein A ismcos(ω0t+θk) And k is 1,2,3 … M, which is an M-ary PSK modulated signal expression. Let the uplink modulation signal be e (t). The downlink optical signal is used as a carrier, and the uplink signal is modulated by a reverse modulator. According to the reverse modulation principle, the uplink signal is multiplied by the downlink received signal, and then the signal after secondary modulation can be obtained. The signal s (t) after the second modulation is obtained as:
S(t)＝Pta[1+Amcos(ω0t+θk)]×e(t)＝Ptae(t)+Amcos(ω0t+θk)e(t)
when the uplink adopts the modulation format of MFSK, its modulation signal e (t) can be expressed as:
Figure BDA0002464148500000051
wherein, an∈ {00,01,10,11}, Δ ω represents the frequency difference between different carriers, θ is the initial phase, g (T) is a representation of a single pulse of the baseband signal, and T is the pulse width.
The signal after the second modulation contains Ptae (t) and Amcos(ω0t+θk) e (t) two components, when ω0＞＞ωcThe band can be used when the carrier frequency spectrum of the uplink and downlink communication links is differentThe pass filter extracts an upstream signal component from the twice modulated signal.
In addition, the single light source full duplex visible light communication system of the embodiment of the present invention further includes: the directional transmission channel is provided with an optical receiver and a receiving end photoelectric detection module.
In the directional transmission channel, the optical receiver mainly receives the light beam directly from the transmitting end, and the optical receiving efficiency is high. Because the energy of direct light in the directional channel accounts for most of the energy, the diffuse reflection signal component caused by wall and object reflection can be ignored. In directional channels, the channel DC gain H of the direct optical signald(0) Can be expressed as:
Figure BDA0002464148500000061
where m is the radiation pattern of the light source, A is the receiving area of the photodetection module, DdIs the channel transmission distance, phi is the angle of incidence,
Figure BDA0002464148500000062
is the beam divergence angle of the LED,
Figure BDA0002464148500000063
is the gain of the optical filter and is,
Figure BDA0002464148500000064
is the FOV of the receiver and is,
Figure BDA0002464148500000065
is the photodetection module focus gain. Wherein
Figure BDA0002464148500000066
Can be expressed as:
Figure BDA0002464148500000067
let the emission power of the LED emission end be PtThen is transmitted through a directional channel and is followedOptical power P received by receiverrComprises the following steps:
Pr＝PtHd(0)
in an indoor visible light communication system adopting an IM/DD mode, a modulated light signal is emitted in the form of light intensity. At a receiving end, the photoelectric detection module outputs an optical current signal by measuring the illumination intensity, so that the signal is transmitted in a visible light channel. The modulated light signal transmitted in the channel is the instantaneous light intensity emitted by the emitting end LED, and due to the PN junction structure of the LED, the input modulated signal cannot have a negative value, so the emitting light intensity value a (t) of the emitting end LED can be expressed as:
A(t)＝Pta(1+Amcos(ω0t+θk))
in the formula AmIs the amplitude of the modulated signal, cos (omega)0t+θk) Representing the modulated signal, mean luminous power PtaSatisfies the following conditions:
Figure BDA0002464148500000068
setting the incident power of indoor background light on the photoelectric detection module at the receiving end as PambThen, the light intensity r (t) received by the receiving-end photodetection module can be represented as:
R(t)＝Pra[1+Amcos(ω0t+θk)]+Pamb
in the formula PraThe average optical power of an optical signal incident on the surface of the photoelectric detection module is set, and the sensitivity of the photoelectric detection module at a receiving end is set as R, then the photocurrent I (t) output by the photoelectric detection module is as follows:
I(t)＝R(Pra+Pamb)+R×Pra×Amcos(ω0t+θk)
as can be seen from the above equation, the response of the photodetection consists of two parts, the effective light signal and the background light signal. Background light such as indoor lighting lamps, sunlight and light sources of other equipment can affect signals output by the detector. Background light in a real scene is generally low-frequency illumination light, direct-current interference generated by the background light can be filtered by using a filter at the rear end of a photoelectric detection module, or a condensing lens is added in front of the photoelectric detection module to inhibit background light signals, so that the signal-to-noise ratio of a channel is improved.
In the system, a PIN photodiode is adopted as a photoelectric conversion device in the photoelectric receiver, and the main noise of a front-end receiving circuit is circuit noise generated by an amplifying circuit and shot noise caused by current. The channel noise can be regarded as additive white gaussian noise n (t) independent of the carrier signal, and the photocurrent i (t) output by the receiving end of the visible light communication system can be further expressed as:
Figure BDA0002464148500000071
where h (t) is the impulse response of the visible light channel, generally expressed as:
Figure BDA0002464148500000072
wherein, anIs the amplitude of the impulse response function, tnIs the propagation delay time, θnIs the propagation delay phase. N is the data of multipath channel, and the multipath effect is ignored in the directional channel, and only the one-way channel response is taken. σ (t) is the basic impulse function in a wireless communication system.
In the channel of the uplink reverse communication link, the illumination intensity R of the surface of the photoelectric detection module at the receiving endu(t) can be expressed as:
Ru(t)＝Pra[1+Amcos(ω0t+θk)]×e(t)+Pamb
in the formula PraFor the average optical power of the incident signal light of the detector, cos (omega)0t+θk) For modulating signals for the downlink, PambFor background light power, e (t) is an uplink modulation signal, and when the sensitivity of the detector is R, the output current y (t) of the receiving-end photodetection module can be expressed as:
Y(t)＝R(Pra×e(t)+Pamb)+R×Pra×Amcos(ω0t+θk)×e(t)。
according to the single-light-source full-duplex visible light communication system, the LED driving module is used for mainly loading a processed signal to be transmitted to the LED light source, the LED light source sends the signal to be transmitted in a light form and transmits the signal in an atmospheric channel, the reverse driving module is used for loading the processed signal to be transmitted to the reverse modulator, and the reverse modulator is used for mainly reflecting a downlink light signal and sending the signal to be transmitted to the atmospheric channel in the light form. The invention adopts a cat eye structure and combines a piezoelectric ceramic telescopic material to manufacture the optical reverse modulator, and the modulator has the advantages of large field angle, lower cost and good response in the whole visible light spectrum range.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made in the above embodiments by those of ordinary skill in the art without departing from the principle and spirit of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (8)

1. A single light source full duplex visible light communication system, comprising: a first signal processing module, an LED driving module, an LED light source, an optical transmitting front end, an optical receiving front end, a reverse driving module, a reverse modulator and a second signal processing module,
the first signal processing module is used for encrypting, coding and modulating a signal to be transmitted, and loading the processed signal to be transmitted to the LED driving module so as to convert the processed signal to be transmitted into an electric signal suitable for driving an LED light source;
the LED driving module is used for loading the processed signal to be transmitted to the LED light source;
the LED light source is used for emitting the signal to be transmitted in a light form and transmitting the signal in an atmospheric channel;
the optical emission front end is used for emitting and enhancing optical signals;
the optical receiving front end is used for converging and enhancing the optical signal processed by the optical transmitting front end, and then the photoelectric detection module is used for carrying out photoelectric conversion processing on the optical signal;
the second signal processing module is used for decrypting, decoding and demodulating the electric signal after photoelectric conversion, and carrying out signal processing of encrypting, coding and modulating on information to be fed back;
the reverse driving module is used for loading the processed signaling to be transmitted to the reverse modulator;
the reverse modulator is used for modulating the optical signals of the downlink for the second time, modulating the uplink information to a downlink light path to be reflected to the active end, and transmitting the signaling to be transmitted to an atmospheric channel in the form of light by reflecting the downlink optical signals;
and then the first signal processing module decrypts, decodes and demodulates the signal processed by the inverse modulator.
2. The single light source full duplex visible light communication system as in claim 1, wherein the inverse modulator remodulates the uplink optical signal, comprising:
let the downlink modulated optical signal a (t) be Pta(1+Amcos(ω0t+θk) In which A) ismcos(ω0t+θk),k is 1,2,3 … M is an M-system PSK modulation signal expression;
setting the uplink modulation signal as e (t), using the following uplink optical signal as carrier, modulating the uplink signal by using a reverse modulator, multiplying the uplink signal by the downlink received signal, and obtaining a signal after secondary modulation, wherein s (t) is:
S(t)＝Pta[1+Amcos(ω0t+θk)]×e(t)
＝Ptae(t)+Amcos(ω0t+θk)e(t)。
3. the single light source full duplex visible light communication system as claimed in claim 2, wherein when the uplink signal adopts the modulation format of MFSK, its modulation signal e (t) can be expressed as:
Figure FDA0002464148490000021
wherein, an∈ {00,01,10,11}, Δ ω represents the frequency difference between different carriers, θ is the initial phase, g (T) is a representation of a single pulse of the baseband signal, and T is the pulse width.
4. The single-light-source full-duplex visible light communication system as in claim 2, wherein the twice-modulated signal comprises Ptae (t) and Amcos(ω0t+θk) e (t) two components, when ω0＞＞ωcWhen the frequency spectrum of the uplink communication link and the frequency spectrum of the downlink communication link are different, the band-pass filter extracts the uplink signal component from the signal after the secondary modulation.
5. The single light source full duplex visible light communication system as in claim 1, wherein the inverse modulator is fabricated from a piezo ceramic flex material.
6. The single light source full duplex visible light communication system as in claim 1 or 5, wherein a light reflecting surface is provided on the light incident side of the inverse modulator.
7. The single light source full duplex visible light communication system as defined in claim 1, further comprising: a directional transmission channel, wherein the directional transmission channel is provided with an optical receiver and a receiving end photoelectric detection module,
the optical receiver is used for receiving direct light from the transmitting end and the channel direct current gain H of the direct light signald(0) Can be expressed as:
Figure FDA0002464148490000022
where m is the radiation pattern of the light source, A is the receiving area of the photodetection module, DdIs the channel transmission distance, phi is the angle of incidence,
Figure FDA0002464148490000024
is the beam divergence angle of the LED,
Figure FDA0002464148490000025
is the gain of the optical filter and is,
Figure FDA0002464148490000027
is the FOV of the receiver and is,
Figure FDA0002464148490000028
is a focus gain of the photo-detection module, wherein
Figure FDA0002464148490000026
Can be expressed as:
Figure FDA0002464148490000023
let the emission power of the LED emission end be PtThe optical power P received by the receiver after transmission through the directional channelrComprises the following steps:
Pr＝PtHd(0)。
8. the single light source full duplex visible light communication system of claim 7,
in the channel of the uplink reverse communication link, the illumination intensity R of the surface of the photoelectric detection module at the receiving endu(t) can be expressed as:
Ru(t)＝Pra[1+Amcos(ω0t+θk)]×e(t)+Pamb
in the formula PraFor the average optical power of the incident signal light of the detector, cos (omega)0t+θk) For modulating signals for the downlink, PambFor background light power, e (t) is an uplink modulation signal, and when the sensitivity of the detector is R, the output current y (t) of the receiving-end photodetection module can be expressed as:
Y(t)＝R(Pra×e(t)+Pamb)+R×Pra×Amcos(ω0t+θk)×e(t)。
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