CN113328805B - Wireless non-contact free space optical communication system - Google Patents
Wireless non-contact free space optical communication system Download PDFInfo
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- CN113328805B CN113328805B CN202110522707.9A CN202110522707A CN113328805B CN 113328805 B CN113328805 B CN 113328805B CN 202110522707 A CN202110522707 A CN 202110522707A CN 113328805 B CN113328805 B CN 113328805B
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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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/502—LED transmitters
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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
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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
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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
- H04B10/50—Transmitters
- H04B10/564—Power control
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- Computer Networks & Wireless Communication (AREA)
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- Optical Communication System (AREA)
Abstract
The invention discloses a wireless non-contact free space optical communication system, comprising: the optical transmitter comprises a driving vibration module, a resonant circuit module and a power control and data input module; the driving vibration module is used for driving the resonant circuit to oscillate; the resonant circuit module is used for generating resonance under the driving action of the driving vibration module, and the generated resonant current enables the light emitting diode to emit light; the power control and data input module is used for controlling the light emitting power of the light emitting diode and loading the light emitting power of the light emitting diode with coded data. The resonance current generated by the specially-made resonance loop module is completely acted on the positive direction of the light-emitting element, a bias circuit is not needed, and the vibration module is driven to improve the bandwidth. The transmission frequency is adjusted by adopting the power control and data input module, so that the frequency is adjustable, the requirement of simultaneously receiving a plurality of terminals can be met, and the application range is wider.
Description
Technical Field
The invention relates to the technical field of optical communication systems, in particular to a wireless non-contact free space optical communication system.
Background
As shown in fig. 1, an existing visible light communication system includes an optical transmitter and an optical receiver, where the optical transmitter includes a voltage-controlled oscillator, a power amplifier, a mixer, a power amplifier, a dc bias circuit, a large inductance rectifier/RC rectifier/pre-emphasis circuit, an optical emitting diode, and a medium data stream, the medium data stream is connected to the mixer, and the optical receiver includes the optical receiver, the power amplifier, the mixer, and the medium data stream, which are connected in sequence, and also includes a voltage-controlled oscillator, and the voltage-controlled oscillator is connected to the mixer. The optical transmitter and the optical receiver propagate by light. The most defects of the existing optical communication system optical transmitter include the following two points:
1. the driving of the optical transmitter follows the conventional design of the radio frequency circuit, resulting in a modulation bandwidth that is too low, below 50 Mhz. This also indirectly results in a low data transfer rate. A direct current bias circuit is used, the modulation bandwidth can be only slightly increased in a mode of adding an alternating current signal to a large inductance end for driving, and an RC rectification and pre-emphasis circuit is limited in bandwidth increase.
2. The response of the alternating current large signal of the radio frequency circuit on the light emitting diode is not linear, so that waveform distortion is caused, a large amount of widely distributed spectrum noise is generated due to distortion after a sine and cosine signal is loaded on the diode, and burrs and tailing are generated after a square wave triangular wave signal is loaded on the diode, so that the receiving quality is influenced.
The most significant drawbacks of the optical receiver of the existing optical communication system are as follows:
1. without the use of a two-channel differential design, it is not tolerant to ambient noise. Lenses are used to increase the received signal-to-noise ratio, and therefore alignment is required, reducing the mobility of the transmitting and receiving ends.
2. Frequency division multiplexing is difficult, and the utilization rate of the frequency spectrum is not high, wherein the frequency spectrum refers to a modulation frequency spectrum of light emission and reception, and does not refer to a light wave frequency spectrum. Orthogonal frequency division multiplexing requires FFT and IFFT circuitry, which is costly.
Disclosure of Invention
Aiming at the defects in the prior art, the invention provides a wireless non-contact free space optical communication system, which improves the transmitting and receiving distance, increases the data transmission rate, does not need a bias circuit and improves the modulation bandwidth.
The invention provides a wireless non-contact free space optical communication system, comprising: the optical transmitter comprises a driving vibration module, a resonant circuit module and a power control and data input module;
the driving vibration module is used for driving the resonant circuit to oscillate;
the resonant circuit module is used for generating resonance under the driving action of the driving vibration module, and the generated resonant current enables the light emitting diode to emit light;
the power control and data input module is used for controlling the light emitting power of the light emitting diode and loading the light emitting power of the light emitting diode with coded data.
Optionally, the resonant circuit module includes an inductor, a radio frequency conversion step-up path, a light emitting diode, and a radio frequency conversion step-down path, where the inductor, the radio frequency conversion step-up path, and the radio frequency conversion step-down path are connected in parallel, the radio frequency conversion step-up path is used to generate an ac high voltage, the radio frequency conversion step-down path is used to generate an ac low voltage, and the generated ac high voltage and the ac low voltage form a voltage difference, so as to generate an ac current, and the ac current unidirectionally passes through the light emitting diode to make the light emitting diode emit light.
Optionally, the resonant tank module further comprises a fixed capacitor for providing a fixed oscillation center frequency, and the capacitor is connected in parallel with the inductor.
Optionally, the resonant tank module further comprises a variable capacitor for providing an adjustable oscillation center frequency, the variable capacitor being connected in parallel with the inductor.
Optionally, the driving vibration module is composed of a pair of NMOS transistors, gates of the two NMOS transistors are connected to drains of the other NMOS transistors, and sources of the two NMOS transistors are connected.
Optionally, the driving vibration module is composed of an upper PMOS pair-transistor amplifier and a lower NMOS pair-transistor amplifier.
Optionally, the number of light emitters is 2.
Optionally, the power control and data input module includes a data input module and a power control module, the data input module is composed of 4 MOS transistors, and the power control module employs a mirror current source.
The invention has the beneficial effects that:
the invention provides a wireless non-contact free space optical communication system, which adopts a specially-made resonant loop module, is different from a Bias-T resonant loop module, a current pre-emphasis resonant loop module, a RC correction resonant loop module and a large inductor series connection resonant loop module, and all generated resonant currents act on the positive direction of a light-emitting element without a Bias circuit, and meanwhile, the bandwidth is improved by driving a vibration module. The transmission frequency is adjusted by adopting the power control and data input module, so that the frequency is adjustable, the requirement of simultaneously receiving a plurality of terminals can be met, and the application range is wider.
Adopt 2 light emitters, 2 light emitters are the bi-polar difference structure, design the binary channels and come the filtering environmental noise, reduce the noise, improve the SNR.
Drawings
In order to more clearly illustrate the detailed description of the invention or the technical solutions in the prior art, the drawings that are needed in the detailed description of the invention or the prior art will be briefly described below. Throughout the drawings, like elements or portions are generally identified by like reference numerals. In the drawings, elements or portions are not necessarily drawn to scale.
Fig. 1 shows a schematic block diagram of a conventional wireless contactless free-space optical communication system;
fig. 2 shows a schematic block diagram of a wireless contactless free-space optical communication system according to a first embodiment of the present invention;
fig. 3 shows a circuit diagram of a single-ended optical transmitter in a wireless contactless free-space optical communication system according to a first embodiment of the present invention;
FIG. 4 shows a circuit diagram of a resonant tank module in a first embodiment of the invention;
fig. 5 shows a circuit diagram of a driving vibration module in the first embodiment of the present invention;
FIG. 6 shows a circuit diagram of a resonant tank module in a second embodiment of the invention;
fig. 7 shows a circuit diagram of a driving vibration module in a second embodiment of the present invention;
FIG. 8 shows a circuit diagram of a resonant tank module in a third embodiment of the invention;
fig. 9 shows a circuit diagram of a driving vibration module in a third embodiment of the present invention;
fig. 10 shows a circuit diagram of a resonant tank module in a fourth embodiment of the invention;
fig. 11 shows a circuit diagram of a two-terminal differential optical transmitter in a wireless contactless free-space optical communication system according to a fifth embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It is also to be understood that the terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in this specification and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be further understood that the term "and/or" as used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.
As used in this specification and the appended claims, the term "if" may be interpreted contextually as "when", "upon" or "in response to a determination" or "in response to a detection". Similarly, the phrase "if it is determined" or "if a [ described condition or event ] is detected" may be interpreted contextually to mean "upon determining" or "in response to determining" or "upon detecting [ described condition or event ]" or "in response to detecting [ described condition or event ]".
It is to be noted that, unless otherwise specified, technical or scientific terms used herein shall have the ordinary meaning as understood by those skilled in the art to which the invention pertains.
Fig. 2 shows a schematic structural diagram of a wireless contactless free-space optical communication system provided by a first embodiment of the present invention, where the system includes: the optical transmitter comprises a driving vibration module, a resonant circuit module and a power control and data input module; the driving vibration module is used for driving the resonant circuit to oscillate; the resonant circuit module is used for generating resonance under the driving action of the driving vibration module, and the generated resonant current enables the light emitting diode to emit light; the power control and data input module is used for controlling the light emitting power of the light emitting diode and loading the light emitting power of the light emitting diode with coded data. The driving vibration module drives the resonance loop to oscillate to generate resonance current so that the light emitting diode emits light, the light emitting diode is used for emitting visible light or infrared light, and the power control and data input module controls the light emitting power of the light emitting diode and loads the light emitting power of the light emitting diode with coding information.
As shown in fig. 3, a circuit diagram of a single-ended optical transmitter is shown, the single-ended optical transmitter includes a driving vibration module, a resonant tank module, a power control and data input module, and a light emitting diode. In this embodiment, the resonant circuit module includes inductance, radio frequency conversion boost circuit, emitting diode and radio frequency conversion step-down circuit, inductance, radio frequency conversion boost circuit and radio frequency conversion step-down circuit are parallelly connected, radio frequency conversion boost circuit is used for producing and exchanges high pressure, radio frequency conversion step-down circuit is used for producing and exchanges low pressure, and the exchange high pressure of production forms the voltage difference with exchanging low pressure to produce alternating current, alternating current makes emitting diode luminous through emitting diode in one-way. In specific implementation, the radio frequency conversion voltage-boosting path and the radio frequency conversion voltage-reducing path are realized by adopting an Enfenidy ring, and a light-emitting diode is connected between the radio frequency conversion voltage-boosting path and the radio frequency conversion voltage-reducing path. As shown in fig. 4, the rf conversion boost path is formed by 2 NMOS transistors, the rf conversion buck path is formed by 2 NMOS transistors, the resonant tank includes an inductor L3, an inductor L4, a diode D2, an NMOS transistor M8, an NMOS transistor M9, an NMOS transistor M11 and an NMOS transistor M10, L3 and L4 are connected in series, one end of L9 is connected to the source of M8, the gate of M11, the gate of M9 and the drain of M11, the drain of M8 is connected to the drain of M9 and the cathode of D2, the source of M9 is connected to the gate of M8, the gate of M10 and the drain of M10, and the anode of D2 is connected to the source of M11 and the source of M10, respectively. As shown in fig. 5, the driving vibration module is composed of a pair of NMOS transistors, gates of the two NMOS transistors are connected to drains of the other NMOS transistor, and sources of the two NMOS transistors are connected. The total width-to-length ratio of the NMOS is 6000, and the width-to-length ratio of the NMOS refers to the channel width-to-length ratio of 100 and the multiple of an interdigital MOS tube of the MOS design is 60. Discrete components may also be used instead of CMOS.
In the second embodiment, the difference from the first embodiment is that the resonant tank module further includes a fixed capacitor for providing a fixed oscillation center frequency, and the capacitor is connected in parallel with the inductor. The capacitance and inductance act on the resonant energy conversion. As shown in fig. 6, a fixed capacitor C2 is connected in parallel with the rf-switched boost path and the rf-switched buck path, respectively. As shown in fig. 7, the driving vibration module is composed of an upper PMOS pair-transistor amplifier and a lower NMOS pair-transistor amplifier. The width-to-length ratio parameter is greater than 600.
In a third embodiment, the difference from the first embodiment is that the resonant tank module further comprises a variable capacitor for providing an adjustable oscillation center frequency, the variable capacitor being connected in parallel with the inductor. Variable capacitance and inductance act on the resonant energy conversion. As shown in fig. 8, the variable capacitor is formed by connecting 2 NMOS transistors. As shown in fig. 9, the driving vibration module employs a triode or discrete component instead of a CMOS transistor.
In the fourth embodiment, the difference from the third embodiment is that, as shown in fig. 10, the NMOS transistor in the resonant tank module is of another type such as a fast recovery diode, a schottky diode, or a zener diode.
The working principle of the resonant circuit module is as follows: when the vibration module is driven to correctly drive the resonant circuit module, the energy of the inductor and the energy of the capacitor are periodically converted, wherein the capacitor refers to the parallel connection of all capacitors in the resonator. The variable capacitor is mainly used for tuning the resonance center frequency. If a variable capacitor and a fixed capacitor are not used, the capacitance of the circuit only has the gate source and gate drain parasitic capacitance of NMOS (N-channel metal oxide semiconductor), or the capacitance of a diode depletion layer of a discrete element is used, only the capacitance of an Enfenidy ring participates in resonance at this time, the system has fixed frequency, but the high-frequency response of the system is better. When the energy of the capacitor is released, part or all of the current passes through the LED, so that the LED emits periodic photons, the power of the emitted photons changes along with the designed central frequency, and modulation information can be loaded. When the resonant circuit module formed by connecting the Infinidi ring and the LC in parallel is driven by the driving vibration module, the phenomenon that a large amount of electrons are gathered in the P area of the light-emitting diode and the gathered electrons can passivate the high-frequency response of the light-emitting diode can be avoided.
The wireless non-contact free space optical communication system provided by the embodiment of the invention adopts a specially-made resonant loop module, is different from the Bias-T, current pre-emphasis, RC correction and large-inductance serial connection, and the scheme completely acts the resonant current on the positive direction of a light-emitting element without a Bias circuit and simultaneously uses a positive feedback amplifying circuit to improve the bandwidth. The transmission frequency is adjusted by adopting the power control and data input module, so that the frequency is adjustable, the requirement of simultaneously receiving a plurality of terminals can be met, and the application range is wider.
As shown in fig. 11, a circuit diagram of a double-ended differential optical transmitter of a wireless contactless free-space optical communication system according to a fifth embodiment of the present invention is shown, which is different from the first embodiment in that the number of the optical transmitters is 2. The power control and data input module comprises a data input module and a power control module, wherein the data input module is composed of 4 MOS (metal oxide semiconductor) tubes, and the power control module adopts a mirror current source. The power control module adopts a mirror current source to control the current power.
The wireless non-contact free space optical communication system provided by the embodiment of the invention adopts a specially-made resonant loop module, is different from the Bias-T, current pre-emphasis, RC correction and large-inductance serial connection, and the scheme completely acts the resonant current on the positive direction of a light-emitting element without a Bias circuit and simultaneously uses a positive feedback amplifying circuit to improve the bandwidth. The transmission frequency is adjusted by adopting the power control and data input module, so that the frequency is adjustable, the requirement of simultaneously receiving a plurality of terminals can be met, and the application range is wider. Adopt 2 light emitters, 2 light emitters are the bi-polar difference structure, design the binary channels and come the filtering environmental noise, reduce the noise, improve the SNR.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; possible designs include integrated circuit designs and common discrete component designs; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the present invention, and they should be construed as being included in the following claims and description.
Claims (7)
1. A wireless contactless free-space optical communication system, comprising: the optical transmitter comprises a driving vibration module, a resonant circuit module and a power control and data input module;
the driving vibration module is used for driving the resonant circuit to oscillate;
the resonant circuit module is used for generating resonance under the driving action of the driving vibration module, and the generated resonant current enables the light emitting diode to emit light;
the power control and data input module is used for controlling the light emitting power of the light emitting diode and loading the light emitting power of the light emitting diode with coded data;
the resonant circuit module comprises an inductor, a radio frequency conversion boosting circuit, a light emitting diode and a radio frequency conversion voltage reducing circuit, wherein the inductor, the radio frequency conversion boosting circuit and the radio frequency conversion voltage reducing circuit are connected in parallel, the radio frequency conversion boosting circuit is used for generating alternating current high voltage, the radio frequency conversion voltage reducing circuit is used for generating alternating current low voltage, and the generated alternating current high voltage and the alternating current low voltage form a voltage difference so as to generate alternating current which enables the light emitting diode to emit light through the light emitting diode in a single direction.
2. The system of claim 1, wherein the resonant tank module further comprises a fixed capacitor for providing a fixed center frequency of oscillation, the capacitor being connected in parallel with an inductor.
3. The system of claim 1, wherein the resonant tank module further comprises a variable capacitor for providing an adjustable center frequency of oscillation, the variable capacitor being connected in parallel with an inductor.
4. The system of claim 1, wherein the driving vibration module is composed of a pair of transistors NMOS, gates of the two NMOS are connected to drains of the other NMOS, and sources of the two NMOS are connected.
5. The system of claim 1, wherein the drive vibration module is comprised of an upper PMOS pair-transistor amplifier and a lower NMOS pair-transistor amplifier.
6. The system of claim 1, wherein the number of light emitters is 2.
7. The system of claim 6, wherein the power control and data input module comprises a data input module and a power control module, the data input module is composed of 4 MOS transistors, and the power control module adopts a mirror current source.
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| CN105119660A (en) * | 2015-07-15 | 2015-12-02 | 南京南大光电工程研究院有限公司 | High-speed LED optical-communication resonant-type modulator |
| US9240726B1 (en) * | 2013-05-16 | 2016-01-19 | Universal Lighting Technologies, Inc. | Dimming LED driver circuit with dynamically controlled resonant tank gain |
| CN105744678A (en) * | 2016-03-11 | 2016-07-06 | 浙江大学 | PWM duty ratio control strategy-based LED driver free of electrolytic capacitor |
| CN106879118A (en) * | 2017-03-29 | 2017-06-20 | 华南理工大学 | A kind of condensance balanced type multi-channel LED drive circuit |
| CN209462661U (en) * | 2018-11-28 | 2019-10-01 | 铜陵迈维电子科技有限公司 | A kind of LED constant current driving power circuit |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0025463D0 (en) * | 2000-10-17 | 2000-11-29 | Isis Innovation | Improvements in or relating to optical wireless communications |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9240726B1 (en) * | 2013-05-16 | 2016-01-19 | Universal Lighting Technologies, Inc. | Dimming LED driver circuit with dynamically controlled resonant tank gain |
| CN105119660A (en) * | 2015-07-15 | 2015-12-02 | 南京南大光电工程研究院有限公司 | High-speed LED optical-communication resonant-type modulator |
| CN105744678A (en) * | 2016-03-11 | 2016-07-06 | 浙江大学 | PWM duty ratio control strategy-based LED driver free of electrolytic capacitor |
| CN106879118A (en) * | 2017-03-29 | 2017-06-20 | 华南理工大学 | A kind of condensance balanced type multi-channel LED drive circuit |
| CN209462661U (en) * | 2018-11-28 | 2019-10-01 | 铜陵迈维电子科技有限公司 | A kind of LED constant current driving power circuit |
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