Simplified calculation method and device for path loss of non-line-of-sight ultraviolet light communication channel

Abstract

The invention relates to the technical field of optical communication, in particular to a simplified calculation method and device for path loss of a non-line-of-sight ultraviolet light communication channel, and the method comprises the steps: uniformly sampling an emission light beam of a non-line-of-sight ultraviolet light communication link into a plurality of sub-light beams; solving the energy contribution of each sub-beam in the plurality of sub-beams to the received signal according to a target rule; and superposing the energy contribution of each sub-beam to the received signal to obtain a closed calculation formula of the path loss, and calculating the actual path loss of the non-line-of-sight ultraviolet light communication link according to the closed calculation formula of the path loss. The method can simplify the calculation process and calculation cost of the path loss of the non-line-of-sight ultraviolet communication channel, can be used for improving the precision of a single scattering approximation method, enables the single scattering approximation method to be close to a single scattering precision method, can reduce the complexity of the path loss evaluation process of the non-line-of-sight near-distance ultraviolet communication channel, and improves the evaluation efficiency of the path loss of the non-line-of-sight near-distance ultraviolet communication channel. And the application range and robustness of the single scattering approximation method are enhanced.

Description

Technical Field

[0001] The present application relates to the field of optical communication technology, and in particular to a method and device for simplifying the calculation of path loss in a non-line-of-sight ultraviolet optical communication channel. Background Art

[0002] In the related art, the path loss of non-line-of-sight short-range ultraviolet communication channels is mainly evaluated by the single scattering exact method. However, this method contains triple integrals and the corresponding upper and lower limits of the integral are complex expressions, which makes it difficult to predict the actual channel performance. For this reason, some single scattering approximation methods have been proposed, which simplify the scattering characteristics of the overlapping volume of the field of view of the transmitter and receiver to obtain a closed path loss expression.

[0003] However, the single scattering precise method for path loss of non-line-of-sight short-range ultraviolet light communication channels in related technologies is highly complex, and the single scattering approximation method is mostly applicable to situations where the field of view angle of the transceiver is small or the overlapping volume of the field of view of the transceiver is small. Its scope of application is relatively limited and cannot meet the calculation requirements of path loss of non-line-of-sight short-range ultraviolet light communication channels in actual scenarios, which needs to be solved urgently. Summary of the invention

[0004] The present application provides a simplified calculation method and device for the path loss of a non-line-of-sight ultraviolet light communication channel, so as to solve the problems that the single scattering precise method for the path loss of a non-line-of-sight short-range ultraviolet light communication channel in the related art is highly complex, and the single scattering approximation method is mostly applicable to situations where the field of view angle of the transceiver end is small or the overlapping volume of the field of view of the transceiver end is small, and the scope of application is relatively limited, and it cannot meet the calculation requirements of the path loss of a non-line-of-sight short-range ultraviolet light communication channel in actual scenarios.

[0005] The first aspect of the present application provides a simplified calculation method for the path loss of a non-line-of-sight ultraviolet communication channel, comprising the following steps: uniformly sampling the transmitted light beam of the non-line-of-sight ultraviolet communication link into multiple sub-beams; solving the energy contribution of each of the multiple sub-beams to the received signal according to a target rule; superimposing the energy contribution of each sub-beam to the received signal to obtain a closed-form calculation formula for the path loss, so as to calculate the actual path loss of the non-line-of-sight ultraviolet communication link according to the closed-form calculation formula for the path loss.

[0006] Optionally, in one embodiment of the present application, before uniformly sampling the emission light beam of the non-line-of-sight ultraviolet light communication link into the multiple sub-beams, it also includes: establishing a system model of the non-line-of-sight ultraviolet light communication link; and using the system model to uniformly sample the emission light beam of the non-line-of-sight ultraviolet light communication link into the multiple sub-beams.

[0007] Optionally, in one embodiment of the present application, solving the energy contribution of each sub-beam in the multiple sub-beams to the received signal according to the target rule includes: obtaining the micro-element volume corresponding to at least one point on each sub-beam; calculating the received energy contributed by the sub-beam corresponding to the micro-element volume; and calculating the energy contribution of each sub-beam to the received signal based on the received energy.

[0008] Optionally, in one embodiment of the present application, the closed-form calculation formula for the path loss is:

[0009]

[0010] Among them, L sim is the simplified calculation result of path loss, β represents the sampling accuracy, v is the maximum number of sampling layers, and v i represents the number of sub-beams corresponding to each layer i where the beam is uniformly sampled, β t represents half of the beam angle at the transmitting end, u represents the number of zeros of the Legendre polynomial in the interval (-1,1), q represents the zero number corresponding to the Legendre polynomial in the interval (-1,1), t q represents the qth zero of the Legendre polynomial, w q Indicates t q The corresponding quadrature coefficient, D i,j and N i,j It is to facilitate the setting of intermediate parameters during the calculation process, where and They are also intermediate parameters set during the calculation process.

[0011] The second aspect of the present application provides a simplified calculation device for the path loss of a non-line-of-sight ultraviolet communication channel, including: a sampling module, used to uniformly sample the transmission light beam of the non-line-of-sight ultraviolet communication link into multiple sub-beams; a solution module, used to solve the energy contribution of each sub-beam in the multiple sub-beams to the received signal according to a target rule; a calculation module, used to superimpose the energy contribution of each sub-beam to the received signal to obtain a closed-form calculation formula for the path loss, so as to calculate the actual path loss of the non-line-of-sight ultraviolet communication link according to the closed-form calculation formula for the path loss.

[0012] Optionally, in one embodiment of the present application, it also includes: an establishment module, used to establish a system model of the non-line-of-sight ultraviolet light communication link before uniformly sampling the emission light beam of the non-line-of-sight ultraviolet light communication link into the multiple sub-beams; a processing module, used to use the system model to uniformly sample the emission light beam of the non-line-of-sight ultraviolet light communication link into the multiple sub-beams.

[0013] Optionally, in one embodiment of the present application, the solution module includes: an acquisition unit, used to acquire the micro-element volume corresponding to at least one point on each sub-beam; a first calculation unit, used to calculate the received energy contributed by the sub-beam corresponding to the micro-element volume; and a second calculation unit, used to calculate the energy contribution of each sub-beam to the received signal based on the received energy.

[0014] Optionally, in one embodiment of the present application, the closed-form calculation formula for the path loss is:

[0015]

[0016] Among them, L sim is the simplified calculation result of path loss, β represents the sampling accuracy, v is the maximum number of sampling layers, and v i represents the number of sub-beams corresponding to each layer i where the beam is uniformly sampled, β t represents half of the beam angle at the transmitting end, u represents the number of zeros of the Legendre polynomial in the interval (-1,1), q represents the zero number corresponding to the Legendre polynomial in the interval (-1,1), t q represents the qth zero of the Legendre polynomial, w q Indicates t q The corresponding quadrature coefficient, D i,j and N i,j It is to facilitate the setting of intermediate parameters during the calculation process, where and They are also intermediate parameters set during the calculation process.

[0017] A third aspect of the present application provides an electronic device, comprising: a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein the processor executes the program to implement the simplified calculation method for path loss of a non-line-of-sight ultraviolet communication channel as described in the above embodiment.

[0018] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, which, when executed by a processor, implements the above-mentioned simplified calculation method for path loss of a non-line-of-sight ultraviolet communication channel.

[0019] The fifth aspect of the present application provides a computer program product, including a computer program, which, when executed, is used to implement the above-mentioned simplified calculation method for path loss of non-line-of-sight ultraviolet communication channels.

[0020] The embodiment of the present application can uniformly sample the transmission beam of the non-line-of-sight ultraviolet light communication link into multiple sub-beams and solve the energy contribution of each sub-beam to the received signal, and then obtain the closed-form calculation formula of the path loss by superimposing the energy contribution of each sub-beam to the received signal, and finally use the formula to calculate the actual path loss of the non-line-of-sight ultraviolet light communication link. Thus, the calculation process and calculation cost of the path loss of the non-line-of-sight ultraviolet light communication channel are simplified. At the same time, the present application can be used to improve the accuracy of the single scattering approximation method, so that it is close to the single scattering precise method, and then the complexity of the path loss evaluation process of the non-line-of-sight short-range ultraviolet light communication channel can be reduced, and the scope of application and robustness of the single scattering approximation method can be enhanced. Thus, the high complexity of the single scattering precise method of the path loss of the non-line-of-sight short-range ultraviolet light communication channel in the related art is solved, and the single scattering approximation method is mostly applicable to the case where the field of view angle of the transceiver is small or the field of view overlap volume of the transceiver is small, and the scope of application is relatively limited, and it cannot meet the calculation requirements of the path loss of the non-line-of-sight short-range ultraviolet light communication channel in the actual scene.

[0021] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0023] Figure 1 A flowchart of a simplified calculation method for path loss of a non-line-of-sight ultraviolet communication channel provided according to an embodiment of the present application;

[0024] Figure 2 A schematic diagram of uniform sampling of an emission light beam according to an embodiment of the present application;

[0025] Figure 3 A schematic diagram of a single scattering system model of a non-line-of-sight ultraviolet communication link according to an embodiment of the present application;

[0026] Figure 4 A schematic diagram showing a comparison of path loss calculation results based on the relationship between path loss and beam angle at the transmitting end according to an embodiment of the present application;

[0027] Figure 5 A schematic diagram showing comparison of path loss calculation results based on the relationship between path loss and receiving end field of view angle according to an embodiment of the present application;

[0028] Figure 6 A schematic diagram of the structure of a simplified calculation device for path loss of a non-line-of-sight ultraviolet communication channel provided according to an embodiment of the present application;

[0029] Figure 7 It is a schematic diagram of the structure of an electronic device provided according to an embodiment of the present application.

[0030] Reference numerals:

[0031] 10-Simplified calculation device for path loss of non-line-of-sight ultraviolet communication channel: 100-sampling module, 200-solution module and 300-calculation module; 701-memory, 702-processor and 703-communication interface. DETAILED DESCRIPTION

[0032] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0033] The following describes the simplified calculation method and device of the non-line-of-sight ultraviolet communication channel path loss of the embodiment of the present application with reference to the accompanying drawings. In view of the high complexity of the single scattering accurate method of the non-line-of-sight short-range ultraviolet communication channel path loss in the related technology mentioned in the above background technology, and the single scattering approximation method is mostly applicable to the situation where the field of view angle of the transceiver is small or the field of view overlap volume of the transceiver is small, the scope of application is relatively limited, and it cannot meet the problem of the calculation demand of the non-line-of-sight short-range ultraviolet communication channel path loss in the actual scene. The present application provides a simplified calculation method of the path loss of the non-line-of-sight ultraviolet communication channel, in which the transmission light beam of the non-line-of-sight ultraviolet communication link can be uniformly sampled into multiple sub-beams and the energy contribution of each sub-beam to the received signal is solved, and then the closed-form calculation formula of the path loss is obtained by superimposing the energy contribution of each sub-beam to the received signal, and finally the actual path loss of the non-line-of-sight ultraviolet communication link is calculated using the formula. Thus, the calculation process and calculation cost of the path loss of the non-line-of-sight ultraviolet communication channel are simplified. At the same time, the present application can be used to improve the accuracy of the single scattering approximation method, making it close to the single scattering precise method, thereby reducing the complexity of the evaluation process of the path loss of the non-line-of-sight short-range ultraviolet communication channel, and enhancing the scope of application and robustness of the single scattering approximation method. Thus, the problems that the single scattering precise method of the path loss of the non-line-of-sight short-range ultraviolet communication channel in the related art is relatively complex, and the single scattering approximation method is mostly applicable to the situation where the field of view angle of the transceiver is small or the field of view overlap volume of the transceiver is small, and the scope of application is relatively limited, and it cannot meet the calculation requirements of the path loss of the non-line-of-sight short-range ultraviolet communication channel in actual scenarios.

[0034] Specifically, Figure 1 A flowchart of a simplified calculation method for path loss of a non-line-of-sight ultraviolet communication channel provided in an embodiment of the present application.

[0035] like Figure 1 As shown, the simplified calculation method for the path loss of the non-line-of-sight ultraviolet communication channel includes the following steps:

[0036] In step S101, a transmission light beam of a non-line-of-sight ultraviolet light communication link is uniformly sampled into a plurality of sub-beams.

[0037] It can be understood by those skilled in the art that non-line-of-sight ultraviolet communication is a communication method that uses the principle of atmospheric scattering to transmit information. Since ultraviolet light is invisible, the naked eye cannot directly detect the existence of the ultraviolet light source. The emission light beam of the non-line-of-sight ultraviolet communication link here refers to the ultraviolet light emitted from the ultraviolet light source for information transmission under non-line-of-sight conditions. This emission light beam has specific wavelength, intensity, directionality, scattering and other characteristics to meet the needs of non-line-of-sight communication.

[0038] In some embodiments, during the transmission of ultraviolet light signals, atmospheric scattering, absorption and other factors may cause the signal strength to gradually weaken as the distance increases. This phenomenon is the path loss of the non-line-of-sight ultraviolet light communication channel (link).

[0039] When simplifying the calculation of the non-line-of-sight ultraviolet light communication channel path, the embodiment of the present application can uniformly sample the transmitted light beam into multiple sub-beams to reduce the complexity of path loss calculation from triple integral to single integral. Figure 2 This is a schematic diagram of uniform sampling of the emission beam according to an embodiment of the present application. Figure 2 As shown, Figure 2 (a) shows the number of layers where the emission beam is uniformly sampled. Figure 2 (b) shows the number of sub-beams corresponding to each layer, β represents the sampling accuracy, v is the maximum number of sampling layers, and the formula can be expressed as but not limited to:

[0040]

[0041] Among them, β t Represents half of the beam angle at the transmitting end.

[0042] On this basis, the embodiment of the present application can deduce the number of sub-beams v corresponding to each layer i: i , where i=0,1,2,…,v.

[0043] When i=0, v0=1, when i≥1, v i It can be derived as follows, but is not limited to:

[0044]

[0045] in,

[0046]

[0047] Optionally, in one embodiment of the present application, before uniformly sampling the emission light beam of the non-line-of-sight ultraviolet light communication link into multiple sub-beams, it also includes: establishing a system model of the non-line-of-sight ultraviolet light communication link; and using the system model to uniformly sample the emission light beam of the non-line-of-sight ultraviolet light communication link into multiple sub-beams.

[0048] In the actual implementation process, before uniformly sampling the transmitted light beam of the non-line-of-sight ultraviolet light communication link into multiple sub-beams, the embodiment of the present application can, but is not limited to, establish a certain system model so as to uniformly sample the transmitted light beam of the non-line-of-sight ultraviolet light communication link according to the system model.

[0049] For example, Figure 3 This is a schematic diagram of a single scattering system model of a non-line-of-sight ultraviolet communication link according to an embodiment of the present application. Figure 3 As shown, in the system model considered in this application, the system parameters can be, but are not limited to, defined as follows: the transmitter Tx is located at the origin of the coordinate (0,0,0), the receiver Rx is located on the Y axis and the coordinate is (0,r,0), β t and β r Represents half of the Tx beam angle and half of the Rx field of view angle, respectively. It represents the pitch angle of Tx, and its direction is counterclockwise from the projection of the Tx beam axis on the XY plane to the Tx beam axis. Represents the pitch angle of Rx, and its direction is rotated clockwise from the projection of the Rx field of view axis on the XY plane to the Rx field of view axis, α t Represents the azimuth of Tx, which is counterclockwise from the positive direction of the X-axis to the projection of the axis of the Tx beam on the XY plane, α r represents the azimuth of Rx, and its direction rotates counterclockwise from the positive direction of the X axis to the projection of the Rx field of view axis on the XY plane. τ and ε represent the distances from the scattering point P to Tx and Rx, respectively. r represents the communication distance. A r Represents the receiving antenna area of ​​Rx.

[0050] Step S102: solving the energy contribution of each sub-beam in the plurality of sub-beams to the received signal according to the target rule.

[0051] In other embodiments, after uniformly sampling the transmitted light beam of the non-line-of-sight ultraviolet communication link into multiple sub-beams, the present application can then solve the energy contribution of each sub-beam to the received signal to eliminate the single integral corresponding to each sub-beam using the target rule.

[0052] Among them, the target rule here can be understood as a related rule algorithm or strategy that can solve the energy contribution of each sub-beam to the received signal. For example, in an embodiment of the present application, the Gauss-Legendre quadrature rule can be used but is not limited to eliminate the single integral corresponding to each sub-beam.

[0053] Next, the process of solving the energy contribution of each sub-beam in multiple sub-beams to the received signal according to the target rule in the embodiment of the present application is further explained.

[0054] Optionally, in one embodiment of the present application, the energy contribution of each sub-beam in multiple sub-beams to the received signal is solved according to the target rule, including: obtaining the micro-element volume corresponding to at least one point on each sub-beam; calculating the received energy contributed by the sub-beam corresponding to the micro-element volume; and calculating the energy contribution of each sub-beam to the received signal based on the received energy.

[0055] In ultraviolet communication systems, the transmitted beam is usually composed of multiple sub-beams, which undergo different scattering and absorption processes during transmission, thus making different contributions to the energy received by the receiving end.

[0056] As a possible implementation method, the embodiments of the present application can, but are not limited to, set any point on the axis of the sub-beam to be wrapped by a micro-element volume, obtain the micro-element volume corresponding to at least one point on each sub-beam, and then calculate the energy contribution of each sub-beam to the received signal based on the received energy contributed by the sub-beam wrapped by the micro-element volume.

[0057] For example, the present application may assume that P i,j is the sub-beam T i,j Any point on the axis, and the point is surrounded by the infinitesimal volume dv i,j Package, further, dv i,j It can be treated as a spherical cap thin layer, and its formula can be expressed as but not limited to:

[0058]

[0059] Among them, τ i,j Represents the scattering point P i,j The distance to Tx. According to the single scattering theory, the micro-element volume dv i,j Contributed received energy It can be derived as follows, but is not limited to:

[0060]

[0061] Among them, Q t represents the transmitted pulse energy, Representation vector TxP i,j and vector P i,jThe angle of Rx, ε i,j Represents the scattering point P i,j Distance to Rx, Represents the vector RxP i,j The angle between the axis of the Rx field of view and the direction of the Rx field of view; is the scattering phase function, which can be expressed as, but not limited to:

[0062]

[0063]

[0064] Among them, k s is the atmospheric scattering coefficient, which can be obtained from the Rayleigh scattering coefficient k s,r and the Mie scattering coefficient k s,m Add together to get; k e is the atmospheric extinction coefficient, which can be expressed by k s and the atmospheric absorption coefficient k s Add together; γ, f and g are the model coefficients.

[0065] By integrating equation (6), we can obtain the sub-beam T i,j Contribution to received energy The formula can be, but is not limited to, expressed as follows:

[0066]

[0067] Among them, f(τ i,j )dτ i,j This is exactly the same as the part on the right side of the equal sign in (6).

[0068] Next, the embodiment of the present application can and Expand the derivation.

[0069] If S 1,i,j =0 and S 2,i,j ≠0 (here S 1,i,j ,S 2,i,j and S 3,i,j It is an intermediate parameter set for the convenience of derivation and has no specific meaning). Assuming that τ 0,i,j If greater than 0, S 1,i,j , S 2,i,j and S 3,i,j It can be derived as follows, but is not limited to:

[0070] S 1,i,j =(N r,x A i,j +N r,y B i,j +N r,z Ci,j ) 2 -cos 2 β r , (11)

[0071]

[0072] Among them, [A i,j ,B i,j ,C i,j ] represents sub-beam T i,j The unit direction vector corresponding to the axis can be expressed as, but not limited to:

[0073]

[0074] [N r,x ,N r,y ,N r,z ] represents the unit direction vector corresponding to the axis of the receiving end field of view, which can be expressed as but not limited to:

[0075]

[0076] In addition, φ in the embodiment of the present application i,j and It can be derived as follows, but is not limited to:

[0077]

[0078] in,

[0079] β j =jβ i +2jtan -1 Υ(i), (22)

[0080]

[0081] If S 1,i,j ≠0 and Δ i,j =S 2,i,j 2 -4S 1,i,j S 3,i,j ≥0, then τ 1,i,j and τ 2,i,j can be expressed as:

[0082]

[0083] When τ 1,i,j >0, When τ 1,i,j <0 and τ 2,i,j >0,

[0084] According to the Gauss-Legendre quadrature rule, equation (10) can be further derived as:

[0085]

[0086] in, Indicates the received energy Q of each sub-beam r Contribution t q is the Leguide polynomial P u The qth root of (t), P u (t) can be expressed as, but not limited to:

[0087]

[0088] In the interval (-1,1), P u (t) has u zeros, based on which the weighting coefficient w q It can be deduced as:

[0089]

[0090] Step S103, superimposing the energy contribution of each sub-beam to the received signal to obtain a closed-form calculation formula for path loss, and calculating the actual path loss of the non-line-of-sight ultraviolet communication link according to the closed-form calculation formula for path loss. The closed-form calculation formula for path loss can be, but is not limited to, expressed as:

[0091]

[0092] Among them, L sim is the simplified calculation result of path loss, β represents the sampling accuracy, v is the maximum number of sampling layers, and v i represents the number of sub-beams corresponding to each layer i where the beam is uniformly sampled, β t represents half of the beam angle at the transmitting end, u represents the number of zeros of the Legendre polynomial in the interval (-1,1), q represents the zero number corresponding to the Legendre polynomial in the interval (-1,1), t q represents the qth zero of the Legendre polynomial, w q Indicates t q The corresponding quadrature coefficient, D i,j and N i,j It is to facilitate the setting of intermediate parameters during the calculation process, where and They are also intermediate parameters set during the calculation process.

[0093] In some embodiments, after obtaining the energy contribution of each sub-beam to the received signal, the present application can superimpose the energy contributions of each sub-beam to the received signal, thereby obtaining a closed-form calculation formula for path loss with a wide range of applications and high calculation accuracy, and then use the closed-form calculation formula for path loss to calculate the actual path loss of the non-line-of-sight ultraviolet communication link. The specific process can be expressed as follows:

[0094] First, the received energy contributed by each sub-beam is superimposed to obtain the total received pulse energy Q r It can be expressed as, but not limited to:

[0095]

[0096] The corresponding path loss L sim It can be expressed as, but not limited to:

[0097]

[0098] Among them, L sim is the simplified calculation result of path loss, β represents the sampling accuracy, v is the maximum number of sampling layers, and v i represents the number of sub-beams corresponding to each layer i where the beam is uniformly sampled, β t represents half of the beam angle at the transmitting end, u represents the number of zeros of the Legendre polynomial in the interval (-1,1), q represents the zero number corresponding to the Legendre polynomial in the interval (-1,1), t q represents the qth zero of the Legendre polynomial, w q Indicates t q The corresponding quadrature coefficient, D i,j and N i,j It is to facilitate the setting of intermediate parameters during the calculation process, where and They are also intermediate parameters set during the calculation process.

[0099] The actual path loss of the non-line-of-sight ultraviolet communication link can be calculated through the closed-form calculation formula of the path loss.

[0100] Additionally, the embodiments of the present application can also verify the effectiveness of the simplified calculation method for the path loss of the non-line-of-sight ultraviolet communication channel proposed in the embodiments of the present application by comparing the path loss calculation results with those of some single scattering precise methods and single scattering approximate methods.

[0101] During the verification process, the system model related parameters used in the embodiment of the present application can be set as follows but are not limited to: s,r =0.24km -1 , k s,m =0.25km-1 , k a =0.90km -1 , γ=0.017, g=0.72, f=0.5, A r =1.92cm 2 ,

[0102] In order to quantitatively evaluate the accuracy of the simplified calculation method for the path loss of the non-line-of-sight short-range ultraviolet communication channel proposed in the embodiment of the present application, the root mean square error (RMSE) can be introduced as an evaluation criterion, but is not limited to it. The formula can be expressed as, but is not limited to:

[0103]

[0104] Among them, x i represents the i-th (i=1,2,…,m) value of a given variable, L exa (x i ) and L sim (x i ) respectively represent the path loss values ​​obtained by the precise method and the simplified calculation method proposed in the embodiment of the present application.

[0105] Figure 4 FIG. 1 is a schematic diagram showing a comparison of path loss calculation results based on the relationship between path loss and the beam angle at the transmitting end according to an embodiment of the present application. Figure 4 As shown, when the communication distance is 50 meters, the root mean square errors of the simplified calculation method and the single scattering approximation method proposed in the embodiment of the present application are 0.04dB and 0.41dB respectively, and when the communication distance is 100 meters, the root mean square errors of the simplified calculation method and the single scattering approximation method proposed in the embodiment of the present application are 0.02dB and 0.40dB respectively.

[0106] Figure 5 FIG. 1 is a schematic diagram showing a comparison of path loss calculation results based on the relationship between path loss and receiving end field of view angle according to an embodiment of the present application. Figure 5 As shown, when the communication distance is 50 meters or 100 meters, the root mean square errors of the simplified calculation method and the single scattering approximation method proposed in the embodiment of the present application are 0.14 dB and 0.79 dB respectively.

[0107] From this, it can be seen that the simplified calculation method for the path loss of the non-line-of-sight short-range ultraviolet light communication channel proposed in the embodiment of the present application is more accurate than the single scattering approximation method and is close to the single scattering precise method, and the simplified calculation method for the path loss of the non-line-of-sight short-range ultraviolet light communication channel proposed in the embodiment of the present application is applicable to any transmitting end beam angle and receiving end field of view angle.

[0108] According to the simplified calculation method for the path loss of the non-line-of-sight ultraviolet communication channel proposed in the embodiment of the present application, the transmission beam of the non-line-of-sight ultraviolet communication link can be uniformly sampled into multiple sub-beams and the energy contribution of each sub-beam to the received signal can be solved, and then the closed-form calculation formula for the path loss is obtained by superimposing the energy contribution of each sub-beam to the received signal, and finally the actual path loss of the non-line-of-sight ultraviolet communication link is calculated using the formula. Thus, the calculation process and calculation cost of the path loss of the non-line-of-sight ultraviolet communication channel are simplified. At the same time, the present application can be used to improve the accuracy of the single scattering approximation method, making it close to the single scattering precise method, thereby reducing the complexity of the path loss evaluation process of the non-line-of-sight short-range ultraviolet communication channel and enhancing the scope of application and robustness of the single scattering approximation method. Thereby, the problems that the single scattering precise method for path loss of non-line-of-sight short-range ultraviolet light communication channel in the related technology is highly complex, and the single scattering approximation method is mostly applicable to situations where the field of view angle of the transceiver is small or the overlapping volume of the field of view of the transceiver is small, and the scope of application is relatively limited, and it cannot meet the calculation requirements of the path loss of non-line-of-sight short-range ultraviolet light communication channel in actual scenarios.

[0109] Next, a simplified calculation device for path loss of a non-line-of-sight ultraviolet communication channel proposed according to an embodiment of the present application is described with reference to the accompanying drawings.

[0110] Figure 6 It is a structural schematic diagram of a simplified calculation device for path loss of a non-line-of-sight ultraviolet communication channel according to an embodiment of the present application.

[0111] like Figure 6 As shown, the simplified calculation device 10 for path loss of non-line-of-sight ultraviolet communication channel includes: a sampling module 100 , a solving module 200 and a calculation module 300 .

[0112] The sampling module 100 is used to uniformly sample the emission light beam of the non-line-of-sight ultraviolet light communication link into a plurality of sub-beams.

[0113] The solving module 200 is used to solve the energy contribution of each sub-beam in the multiple sub-beams to the received signal according to the target rule.

[0114] The calculation module 300 is used to superimpose the energy contribution of each sub-beam to the received signal to obtain a closed-form calculation formula for path loss, so as to calculate the actual path loss of the non-line-of-sight ultraviolet communication link according to the closed-form calculation formula for path loss.

[0115] Optionally, in one embodiment of the present application, it also includes: an establishment module and a processing module.

[0116] The establishment module is used to establish a system model of the non-line-of-sight ultraviolet communication link before uniformly sampling the emission light beam of the non-line-of-sight ultraviolet communication link into multiple sub-beams.

[0117] The processing module is used to uniformly sample the emission light beam of the non-line-of-sight ultraviolet light communication link into a plurality of sub-beams by using a system model.

[0118] Optionally, in one embodiment of the present application, the solution module 200 includes: an acquisition unit, a first calculation unit and a second calculation unit.

[0119] The acquisition unit is used to acquire the micro-element volume corresponding to at least one point on each sub-beam.

[0120] The first calculation unit is used to calculate the received energy contributed by the sub-beam corresponding to the micro-element volume.

[0121] The second calculation unit is used to calculate the energy contribution of each sub-beam to the received signal based on the received energy.

[0122] Optionally, in one embodiment of the present application, a closed-form calculation formula for the path loss may be, but is not limited to, expressed as:

[0123]

[0124] Among them, L sim is the simplified calculation result of path loss, β represents the sampling accuracy, v is the maximum number of sampling layers, and v i represents the number of sub-beams corresponding to each layer i where the beam is uniformly sampled, β t represents half of the beam angle at the transmitting end, u represents the number of zeros of the Legendre polynomial in the interval (-1,1), q represents the zero number corresponding to the Legendre polynomial in the interval (-1,1), t q represents the qth zero of the Legendre polynomial, w q Indicates t q The corresponding quadrature coefficient, D i,j and N i,j It is to facilitate the setting of intermediate parameters during the calculation process, where and They are also intermediate parameters set during the calculation process.

[0125] It should be noted that the aforementioned explanation of the embodiment of the simplified calculation method for the path loss of the non-line-of-sight ultraviolet light communication channel is also applicable to the simplified calculation device for the path loss of the non-line-of-sight ultraviolet light communication channel of this embodiment, and will not be repeated here.

[0126] According to the simplified calculation device for the path loss of the non-line-of-sight ultraviolet communication channel proposed in the embodiment of the present application, the transmission beam of the non-line-of-sight ultraviolet communication link can be uniformly sampled into multiple sub-beams and the energy contribution of each sub-beam to the received signal can be solved, and then the closed-form calculation formula of the path loss is obtained by superimposing the energy contribution of each sub-beam to the received signal, and finally the actual path loss of the non-line-of-sight ultraviolet communication link is calculated using the formula. Thus, the calculation process and calculation cost of the path loss of the non-line-of-sight ultraviolet communication channel are simplified. At the same time, the present application can be used to improve the accuracy of the single scattering approximation method, making it close to the single scattering precise method, thereby reducing the complexity of the path loss evaluation process of the non-line-of-sight short-range ultraviolet communication channel, and enhancing the scope of application and robustness of the single scattering approximation method. Thereby, the problems that the single scattering precise method for path loss of non-line-of-sight short-range ultraviolet light communication channel in the related technology is highly complex, and the single scattering approximation method is mostly applicable to situations where the field of view angle of the transceiver is small or the overlapping volume of the field of view of the transceiver is small, and the scope of application is relatively limited, and it cannot meet the calculation requirements of the path loss of non-line-of-sight short-range ultraviolet light communication channel in actual scenarios.

[0127] Figure 7 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application. The electronic device may include:

[0128] A memory 701 , a processor 702 , and a computer program stored in the memory 701 and executable on the processor 702 .

[0129] When the processor 702 executes the program, the simplified calculation method for the path loss of the non-line-of-sight ultraviolet communication channel provided in the above embodiment is implemented.

[0130] Furthermore, the electronic device further comprises:

[0131] The communication interface 703 is used for communication between the memory 701 and the processor 702 .

[0132] The memory 701 is used to store computer programs that can be executed on the processor 702 .

[0133] The memory 701 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0134] If the memory 701, the processor 702 and the communication interface 703 are implemented independently, the communication interface 703, the memory 701 and the processor 702 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 7 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0135] Optionally, in a specific implementation, if the memory 701, the processor 702 and the communication interface 703 are integrated on a chip, the memory 701, the processor 702 and the communication interface 703 can communicate with each other through an internal interface.

[0136] The processor 702 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0137] An embodiment of the present application also provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the above-mentioned simplified calculation method for path loss of a non-line-of-sight ultraviolet communication channel.

[0138] An embodiment of the present application also provides a computer program product, including a computer program, which can run computer instructions. When the computer instructions are executed by a processor, the simplified calculation method for the path loss of the non-line-of-sight ultraviolet communication channel provided in the embodiment of the present application is implemented.

[0139] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0140] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0141] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0142] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways as necessary and then storing it in a computer memory.

[0143] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. If implemented by hardware, as in another embodiment, it can be implemented by any one or a combination of multiple of the following technologies known in the art: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0144] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0145] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0146] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A simplified calculation method for path loss of non-line-of-sight ultraviolet communication channel, characterized in that: The following steps are involved: uniformly sampling a transmission beam of a non-line-of-sight ultraviolet optical communication link into a plurality of sub-beams; Solve the energy contribution of each sub-beam in the multiple sub-beams to the received signal according to the target rule; The energy contribution of each sub-beam to the received signal is superimposed to obtain a closed-form calculation formula for path loss, so as to calculate the actual path loss of the non-line-of-sight ultraviolet communication link according to the closed-form calculation formula for path loss.

2. The method according to claim 1, characterized in that: Before uniformly sampling the emission light beam of the non-line-of-sight ultraviolet light communication link into the plurality of sub-beams, the method further includes: Establishing a system model of the non-line-of-sight ultraviolet communication link; The system model is used to uniformly sample the emission light beam of the non-line-of-sight ultraviolet light communication link into the multiple sub-beams.

3. The method according to claim 1, characterized in that The step of solving the energy contribution of each of the plurality of sub-beams to the received signal according to the target rule comprises: Obtaining a microelement volume corresponding to at least one point on each sub-beam; Calculating the received energy contributed by the sub-beam corresponding to the micro-element volume; The energy contribution of each sub-beam to the received signal is calculated based on the received energy.

4. The method according to claim 1, characterized in that: The closed-form calculation formula for the path loss is: Among them, L sim is the simplified calculation result of path loss, β represents the sampling accuracy, v is the maximum number of sampling layers, and v i represents the number of sub-beams corresponding to each layer i where the beam is uniformly sampled, β t represents half of the beam angle at the transmitting end, u represents the number of zeros of the Legendre polynomial in the interval (-1,1), q represents the zero number corresponding to the Legendre polynomial in the interval (-1,1), t q represents the qth zero of the Legendre polynomial, w q Indicates t q The corresponding quadrature coefficient, D i,j and N i,j It is to facilitate the setting of intermediate parameters during the calculation process, where and They are also intermediate parameters set during the calculation process.

5. A simplified calculation device for path loss of non-line-of-sight ultraviolet communication channel, characterized in that: include: A sampling module, used for uniformly sampling the emission light beam of the non-line-of-sight ultraviolet light communication link into a plurality of sub-beams; A solving module, used for solving the energy contribution of each sub-beam in the multiple sub-beams to the received signal according to the target rule; A calculation module is used to superimpose the energy contribution of each sub-beam to the received signal to obtain a closed-form calculation formula for path loss, so as to calculate the actual path loss of the non-line-of-sight ultraviolet communication link according to the closed-form calculation formula for path loss.

6. The device according to claim 5, characterized in that Also includes: An establishing module, used for establishing a system model of the non-line-of-sight ultraviolet light communication link before uniformly sampling the emission light beam of the non-line-of-sight ultraviolet light communication link into the multiple sub-beams; A processing module is used to uniformly sample the emission light beam of the non-line-of-sight ultraviolet light communication link into the multiple sub-beams by using the system model.

7. The device according to claim 5, characterized in that The solution module comprises: An acquisition unit, used for acquiring a micro-element volume corresponding to at least one point on each sub-beam; A first calculation unit, used for calculating the received energy contributed by the sub-beam corresponding to the micro-element volume; The second calculation unit is used to calculate the energy contribution of each sub-beam to the received signal based on the received energy.

8. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the simplified calculation method for path loss of a non-line-of-sight ultraviolet communication channel as described in any one of claims 1 to 4.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the simplified calculation method for path loss of a non-line-of-sight ultraviolet communication channel as described in any one of claims 1-4.

10. A computer program product, comprising a computer program, characterized in that When the computer program is executed, it is used to implement the simplified calculation method for path loss of a non-line-of-sight ultraviolet communication channel as described in any one of claims 1-4.

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