CN209930264U - High-gain optical receiving antenna for indoor visible light communication - Google Patents
High-gain optical receiving antenna for indoor visible light communication Download PDFInfo
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- CN209930264U CN209930264U CN201920669310.0U CN201920669310U CN209930264U CN 209930264 U CN209930264 U CN 209930264U CN 201920669310 U CN201920669310 U CN 201920669310U CN 209930264 U CN209930264 U CN 209930264U
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- receiving antenna
- optical receiving
- light communication
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Abstract
The utility model belongs to the technical field of visible light communication, specifically be a high-gain optical receiving antenna for indoor visible light communication. The optical receiving antenna is of a rotational symmetry structure and comprises a first outer surface, a second outer surface, a first inner surface and a second inner surface; the first outer surface and the first inner surface are rotating curved surfaces with the light condensation characteristics of paraboloids of revolution, and the rotating curve of the first inner surface is obtained by rotating the rotating curve of the first outer surface around the vertex by a certain angle beta; the second outer surface is a flat surface and the second inner surface is a spherical surface with a radius R; the optical angle of view of the optical receiving antenna can reach 90 degrees, and is improved by nearly 30 degrees compared with a compound parabolic condenser; the optical gain is as high as 21.53, the signal-to-noise ratio of an optical receiving end is more than 82.7944dB, and the area of a light spot can be effectively reduced by more than 40%; the optical receiving antenna non-composite multilevel structure is convenient to process and install, green and environment-friendly, and can meet the communication requirement of an indoor visible light communication system.
Description
Technical Field
The utility model belongs to the technical field of visible light communication, concretely relates to optical receiving antenna.
Background
Light Emitting Diodes (LEDs) are widely used in the fields of visual transmission, information display, and illumination by virtue of their advantages of high brightness, long life, low power consumption, etc., and therefore LED visible light communication technology has emerged as a new wireless communication technology for implementing information transmission by using light emitting devices to emit high-speed bright flashing light signals that are not perceived by human eyes, and has the characteristics of environmental protection, no electromagnetic interference, high data transmission rate, low power consumption, etc.
In a VLC communication system, an optical antenna is used as an important component of a receiving end, and mainly plays the roles of converging signal light, ensuring the transmission bandwidth of the system and improving the signal-to-noise ratio of the system. However, the major areas of the current research on visible light communication technology include communication channel models, modulation and demodulation technology, and layout optimization of light sources, and the research on visible light reception technology is very little.
In order to improve the receiving power and the signal-to-noise ratio of a receiving end of a visible light communication system and ensure a high gain and a large field angle, various optical antenna design ideas are proposed in the domestic and foreign fields, but the improvement of the field angle, the optical gain and the channel performance of an optical antenna always has many limitations, and the light energy is difficult to be effectively utilized.
SUMMERY OF THE UTILITY MODEL
In order to overcome the above-mentioned shortcoming and not enough of prior art, the utility model aims to provide a high-gain optical receiving antenna for indoor visible light communication, this antenna is rotational symmetry formula structure, through the optimal design of lens structure, has increased the angle of view of antenna, has realized high-gain, and this antenna channel performance is better, can provide the assurance for visible light communication's high rate and high stability.
The purpose of the utility model is realized through the following technical scheme:
a high-gain optical receiving antenna for indoor visible light communication is a rotational symmetric structure, and is shown in figure 1; the method comprises the following steps: a first outer surface 10, a second outer surface 20, a first inner surface 30 and a second inner surface 40; the first outer surface 10 is a surface of revolution (convex surface) having a paraboloidal of revolution light-gathering characteristic, the first inner surface 30 is also a surface of revolution having a paraboloidal of revolution light-gathering characteristic, and the first inner surface 30 is inside the first outer surface 10; the two rotating curved surfaces are intersected at the upper part (the intersection line is a circle), and the intersection point of every two rotating curves (parabolic lines) forming the two rotating curved surfaces is recorded as C1The two rotation curves have the following relationship: the curve of rotation of the first inner surface 30 is surrounded by the curve of rotation of the first outer surface 10 around C1Rotating the inner side by a certain angle beta to obtain the angle beta (beta is the angle of two rotation curves in C)1The tangential angle at a point); the second outer surface 20 is a plane and intersects with the lower part of the first outer surface 10 to form a circle; the second inner surface 40 is a spherical surface (i.e., a convex hemispherical surface) with a radius R, and intersects the first inner surface 30, and the intersection line is a circle, and the distance between the plane of the circle and the second outer surface 20 is the bottom wall thickness, which is denoted as D.
Further, the second outer surface 20 is circular with a radius of 5mm to 7.5 mm.
Further, the radius R of the second inner surface 40 is between 3mm and 5 mm.
Further, the size of the wall thickness D of the bottom part is between 2.5mm and 4.5 mm.
Further, the size of the rotating angle beta is between 3 degrees and 5 degrees.
Further, the material of the optical receiving antenna is polymethyl methacrylate (PMMA).
Further, the radius R, the bottom wall thickness D, and the rotation angle β of the second inner surface 40 are analyzed by a Taguchi orthogonal test and an ANOVA theory to obtain an optimized parameter set, wherein the Taguchi orthogonal test selects optical gain, optical received power, and signal-to-noise ratio as quality characteristics.
Compared with the prior art, the utility model has the advantages of it is following and beneficial effect:
(1) the utility model designs a novel lens structure according to the limitation of the traditional visible light communication optical receiving antenna, the optical field angle can reach 90 degrees, the optical field angle is improved by nearly 30 degrees compared with the traditional compound parabolic condenser structure, and the optical gain is as high as 21.53, so that the light energy is effectively utilized;
(2) the optical receiving antenna designed by the utility model is made of PMMA which is light and easy to process, the size of the focusing light spot can be effectively reduced by more than 40% compared with the traditional structure, the energy distribution of the central area of the light spot is uniform, and the channel performance is good;
(3) the utility model relates to a requirement based on indoor visible light communication system channel performance, the optical antenna non-composite multi-stage antenna of this design, the installation is easy and simple to handle, and can obtain higher optical reception power and stable SNR for the indoor communication blind area reduces greatly.
The optical angle of view of the optical receiving antenna of the utility model can reach 90 degrees, which is improved by 30 degrees compared with the compound parabolic condenser; the optical gain is as high as 21.53, the signal-to-noise ratio of an optical receiving end can reach above 82.7944dB, and the area of a light spot can be effectively reduced by above 40%; the optical receiving antenna non-composite multilevel structure is convenient to process and install, green and environment-friendly, and can meet the communication requirement of an indoor visible light communication system.
Drawings
Fig. 1 is a schematic diagram of a high-gain optical receiving antenna for indoor visible light communication according to the present invention.
Fig. 2 is a schematic view of an indoor visible light communication model in an embodiment of the present invention.
Fig. 3 is a schematic diagram of the cross-sectional distribution of the spot energy in the embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the following examples and drawings, but the present invention is not limited thereto.
Examples
As shown in FIG. 1, a high gain optical receiving antenna for indoor visible light communication, a packageComprises the following steps: a first outer surface 10, a second outer surface 20, a first inner surface 30 and a second inner surface 40; the first outer surface 10 is a surface of revolution (convex surface) having a paraboloidal of revolution light-gathering characteristic, the first inner surface 30 is also a surface of revolution having a paraboloidal of revolution light-gathering characteristic, and the first inner surface 30 is inside the first outer surface 10; the two rotating curved surfaces are intersected at the upper part (the intersection line is a circle), and the intersection point of every two rotating curved lines forming the two rotating curved surfaces is C1The two rotation curves have the following relationship: the curve of rotation of the first inner surface 30 is surrounded by the curve of rotation of the first outer surface 10 around C1Rotating the inner side by a angle beta to obtain the product; the second outer surface 20 is a plane and intersects with the lower part of the first outer surface 10 to form a circle; the second inner surface 40 is a spherical surface (i.e., a convex hemispherical surface) with a radius R, and intersects the first inner surface 30, and the intersection line is a circle, and the distance between the plane of the circle and the second outer surface 20 is the bottom wall thickness, which is denoted as D.
Further, the rotation curve (i.e., longitudinal section curve) of the first outer surface 10 can be described by the following equation:
in the formula (I), the compound is shown in the specification,，θis a half field angle of view,
is the diameter width of the circle where the second outer surface 20 intersects the lower portion of the first outer surface 10,
is the diameter of the entrance port, f is the focal length of the longitudinal section curve,t c is a parameter of the point C, and,His the height of a Compound Parabolic Concentrator (CPC). The cross-section curve equation is constructed by the given parameters as follows:
further, the second inner surface 40 is spherical with a radius R and intersects the first inner surface 30 at a distance D from the second outer surface 40. Further, the second outer surface 20 is a circle with a radius of 5mm-7.5mm, the radius R of the second inner surface 40 is between 3mm-5mm, the bottom wall thickness D is between 2.5mm-4.5mm, the rotation angle β is between 3 ° -5 °, and the material of the optical receiving antenna is polymethyl methacrylate (PMMA).
Further, as shown in fig. 2, the model adopts a typical 5m × 5m × 3m room, wherein the specification of the LED array is 59cm × 59cm, the number of LED beads in each array is 60 × 60, the central light intensity of a single LED bead is 0.73cd, the LED half-power angle is 65 °, the number of LED patterns is 0.8048, and the height of the visible light communication optical receiving plane from the ground is 0.75 m.
Further, the indoor LED array adopts an illumination mean square error minimization layout, and the indoor average illumination is 1073.2 lx. Further, a Taguchi method is adopted to optimize parameters, optical gain, optical receiving power and signal-to-noise ratio of an optical receiving end are selected as quality characteristics, a rotation angle beta, a bottom arm thickness D and a spherical radius R are selected as control factors, and L (3) is designed4) The orthogonal matrix of (2) is subjected to parameter screening. Further, the control levels of the rotation angle β are respectively: 3 °, 4 °, and 5 °; the control levels of the bottom wall thickness D are respectively as follows: 2.5mm, 3.5mm and 4.5 mm; the control levels of the spherical radius R are respectively as follows: 3mm, 4mm and 5 mm. Further, the combination of the maximum optical gain obtained by the preliminary optimization is: β =4 °, D =3.5mm, R =4 mm; the combination of maximum optical received power is: β =4 °, D =3.5mm, R =3 mm; the combination of maximum signal-to-noise ratios is: β =3 °, D =4.5mm, R =5 mm. Further, the contribution rate of each control factor is analyzed by using an ANOVA theory, the contribution rate of the rotation angle β to the optical gain is 71.19%, the contribution rate of the bottom arm thickness D to the received power is 22.17%, the contribution rate of the spherical radius R to the signal-to-noise ratio is 33.64%, and the obtained optimized parameter composition is as follows: the rotation angle beta is 4 degrees, the bottom arm thickness D is 3.5mm, and the spherical radius R is 4 mm.
Further, the light spot energy space distribution condition of the structure is optimized for the optical receiving antenna; further, as shown in fig. 3, for the cross-sectional data of the light spot energy distribution of the receiving end, the light spot energy is mainly gathered in the central area, which effectively reduces the light spot area by more than 40% compared with the traditional compound parabolic receiving antenna, and the light spot central area has uniform energy distribution and good channel performance, and can meet the communication requirement of the indoor visible light communication system.
The above embodiment is only an implementation manner of the present invention, but the implementation manner of the present invention is not limited by the above embodiment, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principle of the present invention should be equivalent replacement manners, and all are included in the protection scope of the present invention.
Claims (7)
1. A high gain optical receiving antenna for indoor visible light communication, which is a rotationally symmetric structure, comprising: a first outer surface (10), a second outer surface (20), a first inner surface (30) and a second inner surface (40); the first outer surface (10) is a rotating curved surface with a paraboloid of revolution light-gathering characteristic, the first inner surface (30) is also a rotating curved surface with a paraboloid of revolution light-gathering characteristic, and the first inner surface (30) is arranged on the inner side of the first outer surface (10); the two rotating curved surfaces are crossed at the upper part, and the intersection point of every two rotating curves forming the two rotating curved surfaces is recorded as C1The two rotation curves have the following relationship: the curve of rotation of the first inner surface (30) is surrounded by the curve of rotation of the first outer surface (10) around C1Rotating the inner side by a angle beta to obtain the product; the second outer surface (20) is a plane and intersects with the lower part of the first outer surface (10) to form a circle; the second inner surface (40) is a semi-convex spherical surface with a radius R, and the intersection line of the second inner surface (40) and the first inner surface (30) is a circle, and the distance between the plane of the circle and the second outer surface (20) is the thickness of the bottom wall and is marked as D.
2. High gain optical receiving antenna for indoor visible light communication according to claim 1, characterized in that the rotation curve of the first outer surface (10) is described by the following equation:
in the formula (I), the compound is shown in the specification,
，θis a half field angle of view,
is the diameter of the circle intersected by the second outer surface (20) and the lower part of the first outer surface (10),
is the diameter of the entrance port, f is the focal length of the rotation curve,t c is a parameter of the point C, and,His the height of the compound parabolic concentrator; the cross-section curve equation is constructed by the given parameters as follows:
3. high gain optical receiving antenna for indoor visible light communication according to claim 2, characterized in that the radius R of the spherical surface of the second inner surface (40) is 3mm-5 mm.
4. A high gain optical receiver antenna for indoor visible light communication according to claim 1, 2 or 3, wherein the bottom wall thickness D is 2.5mm-4.5 mm.
5. The high gain optical receive antenna for indoor visible light communication according to claim 4, wherein the rotation angle β is 3 ° -5 °.
6. The high-gain optical receiving antenna for indoor visible light communication according to claim 1, 2 or 3, wherein the material of the optical receiving antenna is polymethyl methacrylate.
7. A high gain optical receiving antenna for indoor visible light communication according to claim 1, 2 or 3, wherein the radius R, the bottom wall thickness D, and the rotation angle β of the second inner surface (40) are optimized by the group of parameters obtained through the Taguchi orthogonal test and the ANOVA theoretical analysis; the Taguchi quadrature test selects optical gain, optical received power, and signal-to-noise ratio as quality characteristics.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110048772A (en) * | 2019-05-11 | 2019-07-23 | 复旦大学 | A kind of high-gain optical receiver antenna for indoor visible light communication |
| CN111490820A (en) * | 2020-03-07 | 2020-08-04 | 复旦大学 | Optical receiving device and optimization design method thereof |
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2019
- 2019-05-11 CN CN201920669310.0U patent/CN209930264U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110048772A (en) * | 2019-05-11 | 2019-07-23 | 复旦大学 | A kind of high-gain optical receiver antenna for indoor visible light communication |
| CN111490820A (en) * | 2020-03-07 | 2020-08-04 | 复旦大学 | Optical receiving device and optimization design method thereof |
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