CN110086546A - A kind of wide viewing angle reception system based on APD array - Google Patents
A kind of wide viewing angle reception system based on APD array Download PDFInfo
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- CN110086546A CN110086546A CN201910295093.8A CN201910295093A CN110086546A CN 110086546 A CN110086546 A CN 110086546A CN 201910295093 A CN201910295093 A CN 201910295093A CN 110086546 A CN110086546 A CN 110086546A
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- apd array
- apd
- array element
- center
- auxiliary
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Classifications
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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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/67—Optical arrangements in the receiver
- H04B10/671—Optical arrangements in the receiver for controlling the input optical signal
-
- 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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/691—Arrangements for optimizing the photodetector in the receiver
-
- 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
- H04B10/60—Receivers
- H04B10/66—Non-coherent receivers, e.g. using direct detection
- H04B10/69—Electrical arrangements in the receiver
- H04B10/693—Arrangements for optimizing the preamplifier in the receiver
Abstract
The invention discloses a kind of wide viewing angles based on APD array to achieve the above object to receive system, includes one group of APD array, and the APD array includes a center APD array element and is looped around surrounding multiple auxiliary APD array elements；Small for receiver field of view, the problems such as mobility is not strong, this patent proposes the design of APD array structure and receives the combination design of signal, further enhances communication quality while improving receiver field of view；This patent proposes the receiver using 3 × 3 APD array as visible light communication, the whole photosensitive area of equivalent raising receiver；Pass through the equivalent photosensitive area for improving receiver of array structure.
Description
Technical field
The present invention relates to belong to visible light communication field, and in particular to a kind of wide viewing angle reception system based on APD array.
Background technique
The reception battle array on relatively-stationary same plane is mainly concentrated on for the research of VLC array received terminal at present
Column；There are two types of the optical signal receiving arrays that VLC is used, and one is imaging sensor (Camera), and one is PD arrays；Due to
The fast development of the intelligent terminal of LED illumination and insertion camera, the imaging MIMO communication technology based on conventional images sensor
(Optical Camera Communication, OCC) is expected to be applied to numerous areas, such as mobile phone and video screen, road
Communication between lamp and vehicle, vehicle and vehicle, the subsidiary communications etc. of unmanned plane.But the lower frame rate limitation of conventional images sensor
Its application in high-speed communication.The research being distributed at present about the PD array received of MIMO is as follows: 1, receiving battle array in PD
On column plus hemispherical lens (such as Fig. 1) is mainly the convergence using the law of refraction and reflection law and convex lens of light to light
Property, to enable the angle FOV of PD array to be improved and distinguish the hot spot to each LED in receiving plane well
It opens.2, since the FOV of convex lens is relatively small and image quality is not high, hemispherical lens cannot achieve omnidirection reception, projection
Image wrapping and size is larger.To propose fish-eye lens (such as Fig. 2), because extensively (reception light can be improved in its field angle
By force), image quality high (being easy to distinguish in receiving end), imaging size are small (convenient for integrated).3, light is not added in PD receiving array
Learn device and PD normal vector perpendicular to horizontal plane distribution mode there are two types of: LB and SS.LB refers in the mimo system of N × N
LED N route corresponding with PD is blocked, the diagonal entry of the channel matrix H made is 0, and the other elements of H can not
It is 0, the order of matrix H can be made to reach full rank.SS refer to allow receiving end PD array in exist between each PD element it is certain
Spacing, so that arriving for the signal interference for receiving PD reduces, to reduce the correlation of channel.
Summary of the invention
It is an object of the invention to overcome disadvantages described above, a kind of wide viewing angle reception system based on APD array is provided
System.
To achieve the above object, concrete scheme of the invention is as follows: a kind of wide viewing angle reception system based on APD array,
It include one group of APD array, the APD array includes a center APD array element and is looped around surrounding multiple auxiliary
APD array element.
Further, the multiple auxiliary APD array element is 8；8 auxiliary APD array elements and center APD array element form 3*3
Matrix array.
Further, 8 auxiliary APD array elements are along the line direction at the center of respective Center-to-Center APD array element, to
Center array element direction rotates FOVarray；It is described, FOVarrayFor field of view angle.
Further, the 8 auxiliary APD array element and a center APD array element by photodetection grade merge mode into
Row signal receives.
Further, it is 8 that 8 auxiliary APD array element, which merges mode with the photodetection grade of a center APD array element,
Auxiliary APD array element is connected in parallel with a center APD array element, then by amplifying place by trans-impedance amplifier (TIA)
Reason.
Further, the 8 auxiliary APD array element merges mode by exporting electric current with a center APD array element
Carry out signal reception.
Further, it is 8 that the output electric current of 8 auxiliary APD array elements and a center APD array element, which merges mode,
A auxiliary APD array element is passed through after trans-impedance amplifier (TIA) amplifies processing respectively again respectively with a center APD array element
It is pooled in function integrator after power amplifier (AMP).
The invention has the benefit that
Small for receiver field of view, the problems such as mobility is not strong, this patent proposes the design of APD array structure and receives letter
Number combination design, further enhance communication quality while improving receiver field of view.This patent proposes using 3 ×
Receiver of 3 APD array as visible light communication, the whole photosensitive area of equivalent raising receiver；Pass through array structure
The equivalent photosensitive area for improving receiver.
Detailed description of the invention
Fig. 1 is the schematic diagram for adding hemispherical lens on PD receiving array in the prior art；
Fig. 2 is to receive schematic diagram of the mode based on fish-eye lens in the prior art；
Fig. 3 is the different received schematic diagrams of field angle；
Fig. 4 is compound parabolic concentrator schematic diagram；
Fig. 5 is the schematic diagram for adding light cone by receiving end；
Fig. 6 is to communicate to be limited schematic diagram by FOV in the prior art；
Fig. 7 is that APD array of the invention receives schematic diagram；
Fig. 8 is optical principle schematic diagram；
Fig. 9 is the design diagram that array structure of the invention has drift angle；
Figure 10 is that reception mode of the invention carries out the received circuit block diagram of signal by way of photodetection grade merging:
Figure 11, which is reception mode of the invention, to be merged mode by exporting electric current and carries out the received circuit block diagram of signal.
Specific embodiment
The present invention is described in further detail in the following with reference to the drawings and specific embodiments, is not reality of the invention
It applies range and is confined to this.
Normal APD array, its field angle of each (FOV) is identical, but to reduce the correlation of channel
Property, the FOV of PD can be made different, such as Fig. 3 constitutes receiving array using the PD of several difference FOV, FOV big PD makes
The FOV of PD array is sufficiently large, and FOV small PD reduces channel relevancy, can also be by adding some nonimaging optics devices
Part, such as compound parabolic concentrator, such as Fig. 4, light cone such as Fig. 5.
The main object of the present invention is exactly to further enhance communication quality while improving receiver field of view.Field angle
(Field of View, FOV) refers to that receiving end can receive the maximum angle of light.
The size of field angle determines the moving range of communication receiver.Sending N number of received array of PD for M LED can
Light-exposed communication system, it is assumed that channel DC current gain matrix is H, and transmitting signal matrix is X, then receipt signal matrix Y can be indicated
Are as follows:
Y=HX+XN(1)
Wherein, XNIt is n dimension additive white Gaussian noise, the expression formula of channel matrix H are as follows:
Wherein, 1≤i≤N, 1≤j≤M, hijThe DC current gain for indicating j-th of LED to i-th PD, may be expressed as:
Wherein, m=-ln2/ln (cos θ1/2) indicate LED light source order of modulation, θ1/2Indicate the half-power of LED light source
Angle, θijIndicate that the light emitting angle of j-th of LED to i-th PD, k indicate the visual field ascent of PD, φijIndicate j-th of LED to
The incidence angle of i PD, S indicate the effective area of PD, dijIndicate the light transmission range of j-th of LED to i-th PD in array, T
(φij) indicate filter gain, g (φij) indicate lens gain.So making PD's when receiving end moves out a certain range
Incidence angle φijGreater than field angle ψcWhen, interrupted communication link.
The mobility of visible light communication receiver is excessively poor at present, as long as almost slightly moving some positions, communication will
It interrupts.As shown in fig. 6, when underface of the receiver in light source, receiving optics can well converge optical signal its reason
Gather on sensitive chip, still, when receiver slightly moves some positions, receiving optics can not converge to optical signal
On sensitive chip, communication disruption.
Such as Fig. 7, it includes one group APD gusts that a kind of wide viewing angle based on APD array described in the present embodiment, which receives system,
Column, the APD array include a center APD array element and are looped around surrounding multiple auxiliary APD array elements.Pass through array
The equivalent photosensitive area for improving receiver of structure.
In engineering optics, any light issued from object focus becomes the light for being parallel to optical axis after optical system
Line extends this and obtains its intersection point to conjugate rays, and the set of this intersection point constitutes object space interarea, and the intersection point H of the interarea and optical axis is known as
Object space principal point.After being parallel to the light incidence of optical axis, emergent ray meets at image space intersection point, extends this and obtains its friendship to conjugate rays
Point, the set of the intersection point constitute image space interarea, and the intersection point H ' of it and optical axis is known as image space principal point.In optical system, principal point is crossed
Conjugate rays, direction will not change；As shown in Figure 8.
A kind of wide viewing angle based on APD array described in the present embodiment receives the conjugate rays direction that system utilized principal point
This constant property advanced optimizes communications reception array structure, improves communication quality, i.e., by remaining in addition to the array element of center
Channel gain is improved in 8 APD array element direction of rotation；In visible light communication system, receiver uses array received, works as reception
The angle of incidence of light of machine is less than FOVarrayWhen, communication channel gain is also limited by many factors.By formula (3) it is found that passing through reduction
The incidence angle φ of PDij, channel gain can be effectively improved, so this patent is directed to receiver in peak excursion position, by inclining
The normal vector direction of oblique array 8 APD array elements of surrounding, makes it be directed toward light source, and then largely reduce the incidence angle of light
Degree improves channel gain.
A kind of wide viewing angle reception system based on APD array described in the present embodiment, the multiple auxiliary APD array element is 8
It is a；8 auxiliary APD array elements and center APD array element form the matrix array of 3*3.
Further, a kind of wide viewing angle reception system based on APD array, 8 auxiliary APD array elements described in the present embodiment
Along the line direction at the center of respective Center-to-Center APD array element, Xiang Zhongxin array element direction rotates FOVarray；It is described
FOVarrayFor field of view angle.Wherein, FOVarrayRefer to field angle of 3 × 3 APD arrays in the case where not rotating array element
Degree.
As shown in Figure 10, further, a kind of wide viewing angle reception system based on APD array, institute described in the present embodiment
It states 8 auxiliary APD array elements mode is merged by photodetection grade with a center APD array element and carry out signal reception.
Further, a kind of wide viewing angle reception system based on APD array, 8 auxiliary APD described in the present embodiment
Array element merge with the photodetection grade of a center APD array element mode be 8 auxiliary APD array elements with a center APD array element simultaneously
It is linked togather, then amplifies processing by trans-impedance amplifier (TIA).The circuit structure that photodetection grade merges is simpler
It is single, only need multiple APD and trans-impedance amplifier.But since multiple APD carry out parallel connection, the total capacitance in APD is suitable
In parallel connection, can easily be known according to the calculation formula of shunt capacitance, if multiple capacitors are in parallel, total shunt capacitance
Capacitance will increase, and the capacitance of increase can make the charge and discharge time between capacitor two-plate elongated, so that the bandwidth of operation of APD drops
It is low.
As shown in figure 11, further, a kind of wide viewing angle reception system based on APD array, institute described in the present embodiment
It states 8 auxiliary APD array elements and center APD array element and merges mode by exporting electric current and carry out signal reception.
Further, a kind of wide viewing angle reception system based on APD array, 8 auxiliary APD described in the present embodiment
It is 8 auxiliary APD array elements and a center APD array element that the output electric current of array element and a center APD array element, which merges mode,
Collection of functions is pooled to after power amplifier (AMP) respectively again after trans-impedance amplifier (TIA) amplifies processing respectively
In growing up to be a useful person.
The circuit structure that detection current stage merges is complicated compared to the circuit structure that photodetection grade merges, and multiple need to put across resistance
Big device and power amplifier.But due to only one APD array element of every road, capacitor will not change, so that APD
Obtain wider bandwidth of operation.
In a kind of wide viewing angle reception system based on APD array described in the present embodiment, the topology layout of (1) APD array,
By taking 3 × 3APD array structure as an example, in conjunction with this constant property of conjugate rays direction that engineering optics crosses principal point, by array surrounding
8 array elements rotate FOV along the line direction of current array element and center array element, Xiang Zhongxin array element directionarray, improving, receiver is whole
The incident angle of light is largely reduced while body-sensing light area, improves channel gain；(2) APD array difference array element
The combination of the signal received, a kind of wide viewing angle based on APD array described in the present embodiment receive two kinds of letters of system
Number combination: photodetection grade merges, and which circuit structure is simple, but the bandwidth of operation of APD decreases；Detection electricity
It flows grade to merge, the bandwidth of operation of which APD will not change.
The above is only a preferred embodiment of the invention, therefore all according to structure described in present patent application range
It makes, the equivalent change or modification that feature and principle are done, in the protection scope of present patent application.
Claims (7)
1. a kind of wide viewing angle based on APD array receives system, it is characterised in that: it include one group of APD array, it is APD gusts described
Column include a center APD array element and are looped around surrounding multiple auxiliary APD array elements.
2. a kind of wide viewing angle based on APD array according to claim 1 receives system, it is characterised in that: it is the multiple
Assisting APD array element is 8；8 auxiliary APD array elements and center APD array element form the matrix array of 3*3.
3. a kind of wide viewing angle based on APD array according to claim 2 receives system, it is characterised in that: 8 auxiliary
For APD array element along the line direction at the center of respective Center-to-Center APD array element, Xiang Zhongxin array element direction rotates FOVarray；
It is described, FOVarrayField of view angle.
4. a kind of wide viewing angle based on APD array according to claim 2 or 3 receives system, it is characterised in that: described 8
A auxiliary APD array element merges mode by photodetection grade with a center APD array element and carries out signal reception.
5. a kind of wide viewing angle based on APD array according to claim 4 receives system, it is characterised in that: described 8 are auxiliary
Helping APD array element to merge mode with the photodetection grade of a center APD array element is 8 auxiliary APD array elements and one center APD gusts
Member is connected in parallel, then by amplifying processing by trans-impedance amplifier (TIA).
6. a kind of wide viewing angle based on APD array according to claim 2 or 3 receives system, it is characterised in that: described 8
A auxiliary APD array element merges mode by output electric current with a center APD array element and carries out signal reception.
7. a kind of wide viewing angle based on APD array according to claim 4 receives system, it is characterised in that: described 8 are auxiliary
Helping the output electric current of APD array element and a center APD array element to merge mode is 8 auxiliary APD array elements and a center APD
Array element is pooled to letter after power amplifier (AMP) respectively again after trans-impedance amplifier (TIA) amplifies processing respectively
During manifold is grown up to be a useful person.
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| CN201910295093.8A CN110086546A (en) | 2019-04-12 | 2019-04-12 | A kind of wide viewing angle reception system based on APD array |
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Cited By (1)
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