CN214045632U - non-Lambert artificial scrambling auxiliary visible light secret communication emitter device - Google Patents
non-Lambert artificial scrambling auxiliary visible light secret communication emitter device Download PDFInfo
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- CN214045632U CN214045632U CN202120362037.4U CN202120362037U CN214045632U CN 214045632 U CN214045632 U CN 214045632U CN 202120362037 U CN202120362037 U CN 202120362037U CN 214045632 U CN214045632 U CN 214045632U
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Abstract
The utility model relates to a secret communication device technical field of visible light, a secret communication transmitter device of supplementary visible light of artifical scrambling of non-lambert, the combiner is connected with drive circuit's input electricity, drive circuit's output is connected with visible light wireless transmitter's input electricity, visible light wireless transmitter is space distribution formula visible light wireless transmitter or the centralized visible light wireless transmitter in space, visible light wireless transmitter among space distribution formula visible light wireless transmitter or the centralized visible light wireless transmitter in space adopts non-lambert transmitter, visible light wireless transmitter's signal output part and the input communication connection of receiving terminal. The receiving end contains a target user Bob and a potential eavesdropping user Eve. The receiving signal-to-noise ratio of the target user Bob can be ensured, and the negative interference of artificial noise can not be caused, so that the physical layer safety level of the target user Bob is integrally improved.
Description
Technical Field
The utility model relates to a secret communication device technical field of visible light is a secret communication transmitter device of supplementary visible light of artifical scrambling of non-Lambert.
Background
At present, the technical scheme of visible light secure communication is still limited to an indoor wireless scene in which a distributed commercial solid-state (represented by LED) light source array is distributed. In such a scenario, each array of light sources acts as a visible light wireless transmitter. In modeling analysis of such scenarios, the international published literature typically assumes that the light source array possesses omnidirectional spatial radiation characteristics, following a lambertian spatial radiation model. Typically, the Ayman Mostafa research team at the university of British Columbia, Canada, published in the published article "Physical-Layer Security for Indor visual Light Communications" in 2014, attempted to introduce artificial noise scrambling into a 2 × 2 component distributed Lambertian Light source array Indoor scene. It must be noted that such a solution is still accompanied by significant technical drawbacks. On the one hand, such schemes only discuss lambertian light source array configurations. It must be fully appreciated that the primary fundamental function of solid state light sources involved in secure visible light wireless links is to provide customized lighting for different scenes, indoor, outdoor, road, vehicle, tunnel, etc. To meet different customized lighting requirements, lighting fixture manufacturers generally require a secondary light distribution design by means of beam radiation characteristics. The typical secondary light distribution design method comprises the step of additionally arranging a secondary light distribution element such as a reflecting cup, a free-form surface lens and the like on an original solid-state light source.
Generally, a solid-state light source subjected to secondary light distribution by a manufacturer can project main light power to a target illumination area, and the radiation characteristic of the customized light source is usually non-Lambertian and is obviously different from the traditional Lambertian space radiation characteristic. On the other hand, the existing secret visible light wireless link scheme based on the lambertian artificial noise source is only suitable for the configuration of the distributed array type visible light wireless transmitter and cannot serve a plurality of indoor scenes with only a single visible light wireless transmitter.
Disclosure of Invention
The utility model provides a supplementary secret communication transmitter device of visible light of artifical scrambling of non-Lambert has overcome above-mentioned prior art not enough, and it can effectively solve current secret visible light wireless link scheme based on artificial noise source and can't serve in the problem that only possesses the numerous indoor scenes of single visible light wireless transmitter.
The technical scheme of the utility model is realized through following measure: the utility model provides a secret communication emitter device of supplementary visible light of artifical scrambling of non-Lambert, including the combiner, visible light wireless transmitter, drive circuit and receiving terminal, the combiner is connected with drive circuit's input electricity, drive circuit's output is connected with visible light wireless transmitter's input electricity, visible light wireless transmitter is spatial distribution formula visible light wireless transmitter or the centralized visible light wireless transmitter in space, visible light wireless transmitter among spatial distribution formula visible light wireless transmitter or the centralized visible light wireless transmitter in space adopts non-Lambert transmitter, visible light wireless transmitter's signal output part and the input communication connection of receiving terminal, the receiving terminal contains target user Bob and potential eavesdrop user Eve.
The following are further optimization or/and improvement of the technical scheme of the utility model:
the above-mentioned spatially distributed visible light wireless transmitters are N visible light wireless transmitters uniformly distributed on the ceiling of the user, N being greater than 1.
The spatially centralized visible light wireless transmitter described above is such that only a single visible light wireless transmitter is placed on the user's ceiling, the single visible light wireless transmitter being comprised of N sub-arrays of non-lambertian transmitters, N being greater than 1.
The combiner combines the data signal and the artificial noise source signal into a data stream signal.
The driving circuit comprises a direct current source and a bias device, and the direct current source is electrically connected with the bias device.
Visible light secret communication method based on artificial noise source can serve the utility model provides a space distribution formula or centralized visible light wireless transmitter configuration both with the help of the utility model provides a non-lambert light beam that non-lambert light source sent carries out non-lambert artifical scrambling, utilizes again the utility model provides a non-lambert light source carries out the loading of communication data, comes the latent receiving signal to noise ratio of eavesdropping user Eve of degradation with the help of artificial noise source, ensures target user Bob's receiving signal to noise ratio simultaneously to can not receive artificial noise's negative disturbance, thereby promote target user Bob's physical layer security level on the whole.
Drawings
Fig. 1 is a schematic structural diagram of the visible light secret communication transmitter device of the present invention.
Fig. 2 is a schematic structural diagram of a driving circuit.
Fig. 3 is one of application scenarios of a spatially concentrated visible light wireless transmitter configuration (planar geometry, 3 sets of non-lambertian beams).
Fig. 4 is a schematic diagram of one of the application scenarios (planar geometry, 3 sets of non-lambertian beams) for a spatially distributed visible light wireless transmitter configuration.
Fig. 5 is a schematic diagram of a second application scenario (planar geometry, 4 sets of non-lambertian beams) of a spatially concentrated visible light wireless transmitter configuration.
Fig. 6 is a schematic diagram of a second application scenario (planar geometry, 4 sets of non-lambertian beams) of a spatially distributed visible light wireless transmitter configuration.
Fig. 7 is a system block diagram of the usage flow of the present invention.
Fig. 8 is a block diagram of the flow of the signal received by the target user according to the present invention.
Fig. 9 is a block diagram of the flow of the signal received by the eavesdropping user according to the present invention.
In the figure, 1 is a visible light wireless transmitter, 2 is a non-lambertian beam, 3 is a target user, 4 is an eavesdropping user, 5 is a processing control unit, and 6 is a network center and is connected with an external network.
Detailed Description
The utility model discloses do not receive the restriction of following embodiment, can be according to the utility model discloses a technical scheme and actual conditions determine concrete implementation.
In the present invention, for convenience of description, the description of the relative position relationship of the components is described according to the layout pattern of fig. 3 in the specification, such as: the positional relationship of front, rear, upper, lower, left, right, etc. is determined in accordance with the layout direction of fig. 3 of the specification.
For ease of illustration, the non-lambertian emitter of the present invention is illustrated with a non-lambertian light source (e.g., an LED light source).
The invention will be further described with reference to the following examples and drawings:
as shown in fig. 1, the non-lambertian artificial scrambling assisted visible light secret communication emitter device includes a combiner, a visible light wireless emitter, a driving circuit and a receiving end, the combiner is electrically connected to an input end of the driving circuit, an output end of the driving circuit is electrically connected to an input end of the visible light wireless emitter, the visible light wireless emitter is a spatially distributed visible light wireless emitter or a spatially centralized visible light wireless emitter, the visible light wireless emitter in the spatially distributed visible light wireless emitter or the spatially centralized visible light wireless emitter employs a non-lambertian emitter, a signal output end of the visible light wireless emitter is communicatively connected to an input end of the receiving end, and the receiving end includes a target user Bob and a potential eavesdropping user Eve.
As shown in fig. 2, the driving circuit includes a dc source and a bias device, which are electrically connected.
As shown in fig. 3 to 6, the non-lambertian artificial scrambling assisted secret visible light communication transmitter device includes a spatially distributed visible light wireless transmitter or a spatially concentrated visible light wireless transmitter, both of which employ non-lambertian transmitters.
The spatial distribution type visible light wireless transmitter realizes the overlapping coverage of multiple paths of optical signals at the same user position by means of the spatial layout of the non-Lambert transmitters and the spatial concentration type visible light wireless transmitter by means of the non-Lambert transmitters integrated into a whole. Secret visible light wireless link scheme based on artificial noise scrambling technique can serve in the utility model a numerous indoor scenes of the centralized visible light wireless transmitter in space (only possess single visible light wireless transmitter promptly) configuration also can serve the indoor scene of the distributed visible light wireless transmitter in space configuration certainly.
The visible light secret communication transmitter device assisted by the non-Lambertian artificial scrambling can be further optimized or/and improved according to actual needs:
as shown in fig. 4 and 6, the spatially distributed visible light wireless transmitters are N visible light wireless transmitters uniformly distributed on the ceiling of the user, where N is greater than 1.
As shown in fig. 3 and 5, the spatially concentrated visible light wireless transmitter is a single visible light wireless transmitter disposed on the ceiling of the user, the single visible light wireless transmitter being composed of N sub-arrays of non-lambertian transmitters, N being greater than 1.
The single visible light wireless transmitter is formed by N non-Lambertian transmitter sub-arrays which are integrally packaged.
The original data stream signal enters a bias device, and is superposed with the direct current signal of the direct current source to output a driving signal, so as to drive a non-Lambertian light source (such as an LED light source) to emit a light beam.
As shown in fig. 7, 8 and 9, the method for performing the visible light secret communication by the invention comprises the following steps:
step one, as shown in fig. 4 and 6, the configuration of the spatially distributed visible light wireless transmitter is NarrayThe visible light wireless transmitters with the same size are uniformly distributed on the ceiling, the visible light wireless transmitters adopt solid-state light sources (such as LEDs) with heterogeneous beam characteristics, the solid-state light sources distributed on the indoor ceiling form a compact light source array, and the light source array is used as a visible light signal transmitter and is distributed in the spaceUnder the configuration of the visible light wireless transmitter, visible light channel gain vectors with significant difference can be obtained at different receiving positions of the same signal receiving plane (the length of the vector is N)array) The difference degree of the gain vectors of the visible light channels is influenced by two factors: (1) the length difference of the links from each spatially distributed visible light wireless transmitter to different receiving positions; (2) the intensity difference of each spatially distributed visible light wireless transmitter to different receiving position orientations.
Under the configuration of the spatial distribution type visible light wireless transmitter, the gain of a line of sight (LOS) channel from the ith visible light wireless transmitter to any receiving position on a receiving plane
Represents:
wherein A isRRepresenting the detection area of the photodiode of the subscriber receiver, darray，iRepresenting the LOS distance between the ith visible light wireless transmitter and the user receiver, theta representing the emergent elevation angle of the visible light signal relative to the normal direction of the current visible light wireless transmitter, phi representing the emergent azimuth angle of the visible light signal relative to the normal direction of the current visible light wireless transmitter,
representing the radiation intensity of the current space beam of the visible light wireless transmitter in the (theta, phi) space direction, if the space beam of the visible light wireless transmitter is a rotation symmetrical beam, the radiation intensity is independent of the emergent azimuth angle phi, and the corresponding radiation intensity is expressed as
Gamma represents the angle of incidence of the visible light signal on the user receiver,
is connected withThe field angle of the receiver, r represents the photoelectric responsivity of the receiver;
as shown in fig. 3 and 5, the spatially centralized visible light wireless transmitter configuration is such that only a single visible light wireless transmitter is placed on the ceiling (typically at the central location of the ceiling), with the single visible light wireless transmitter being represented by Nsub_arrayThe small-sized solid-state light source (such as LED) subarrays are formed by packaging according to the requirement of a required geometric structure, the light source subarrays are used as visible light signal transmitters, the different radiation characteristics are provided among the light source subarrays, so that different light source subarrays provide different visible light channel gains at the same receiving position on the same receiving plane,
under the configuration of the spatial centralized visible light wireless transmitter, the gain of a line of sight (LOS) channel from the ith visible light wireless transmitter subarray to any receiving position on the receiving plane
Represents:
wherein A isRRepresenting the detection area of the photodiode of the subscriber receiver, dsub_array，iRepresenting the LOS distance between the ith visible light wireless transmitter subarray and the user receiver, theta representing the emergent pitch angle of the visible light signal relative to the normal direction of the current light source subarray, phi representing the emergent azimuth angle of the visible light signal relative to the normal direction of the light source subarray,
representing the radiation intensity of the current light source sub-array space beam in the (theta, phi) space direction, if the light source sub-array space beam is a rotation symmetrical beam, the radiation intensity is independent of the emergent azimuth angle phi, and the corresponding radiation intensity represents
Gamma representsThe angle of incidence of the visible light signal on the user receiver,
the viewing angle of the watch receiver, r represents the photoelectric responsivity of the receiver;
step two, under the configuration of a space distributed visible light wireless transmitter, according to the grasped CSI structure of the target user Bob, constructing a normalized channel vector of the target user Bob:
wherein the content of the first and second substances,
normalized channel vector representing target user Bob, [.]TRepresenting a matrix transpose operation,
is the channel gain of the ith distributed light source array transmitter to the target user Bob,
a normalization factor of the target user Bob channel vector is taken as
In this way, the first and second electrodes,
||.||1representing a 1-norm operator, and meanwhile, constructing a channel vector of a target user:
further, the (N) corresponding to the channel vector is obtainedarray-1) zero-space column vectors
(vector size is 1 inNarray) The above (N)array-1) zero-space column vectors
Combined to a size of Narray×(Narray-1) target user null-space matrix Ψbob；
Under the configuration of a centralized visible light wireless transmitter, constructing a channel vector of a target user according to the grasped CSI construction of the target user Bob:
wherein [.]TRepresenting a matrix transpose operation,
the channel gain from jth centralized light source sub-array to eavesdropping user, and then the (N) corresponding to the channel vectorsub_array-1) zero-space column vectors
(vector size 1 XNsub_array) Will (N)sub_array-1) zero-space column vectors
Combined to a size of Nsub_array×(Nsub_array-1) null-space matrix Ψbob；
Step three, under the condition that the visible light signal transmitter needs to keep the total transmission power constant, using a part of transmission power for transmitting data symbols, and simultaneously using the rest of transmission power for transmitting artificial noise, wherein the proportion of the useful data symbol transmission power is rho, the proportion of the artificial noise transmission power is (1-rho), and considering that the visible light wireless transmitter does not master the channel state information of the eavesdropping user Eve, the artificial noise transmission power with the proportion of (1-rho) is uniformly distributed under the configuration of the space distributed visible light wireless transmitter (N)array-1) nulled spatial directions (null-space column vectors)
Or the artificial noise emission power with the proportion of (1-rho) is equally distributed under the configuration of the space concentration type visible light wireless transmitter (N)sub_array-1) nullable spatial directions
Thus, in a spatially distributed visible light wireless transmitter configuration, the transmitted signal vector corresponding to a distributed light source array (compact light source array) is represented as:
wherein, alpha is ∈ [0,1 ]]Representing the intensity modulation index of the light source, d e-1, 1]Representing transmitted data symbols, Ji∈[-1,1]，i∈{1,2,…Narray-1 represents the transmitted artificial noise signal, k being a scaling constant whose function is to constrain the peak signal level of the transmitted signal vector,
in a spatially centralized visible light wireless transmitter configuration, the transmit signal vector corresponding to a centralized light source sub-array is represented as:
wherein similarly d e [ -1,1 [ ]]Representing transmitted data symbols, Ji∈[-1,1]，i∈{1,2,…Nsub_array-1} representing the transmitted artificial noise signal, k being a scaling constant whose function is to constrain the transmitted signal vectorA peak signal level;
step four, under the configuration of the spatially distributed or centralized visible light wireless transmitter, simultaneously loading the data symbols and the artificial noise mixed signals including the steps on the corresponding distributed light source array or centralized light source sub-array, so that the visible light signal received by the target user Bob is represented as:
where k represents the peak signal level scaling constant, α ∈ [0,1 ]]Representing the intensity modulation index, h, of the light sourcebobRepresenting the channel vector of the target user Bob, p representing the proportion of useful data symbol transmit power, d ∈ -1,1]Representing transmitted data symbols, zbobRepresenting the noise captured by the target user Bob, it is clear that the target user Bob is not affected by artificial noise according to the above equation;
meanwhile, under the configuration of the spatially distributed visible light wireless transmitter, the visible light signal received by the eavesdropping user Eve is represented as:
under the configuration of the spatial centralized visible light wireless transmitter, the visible light signal received by the eavesdropping user Eve is expressed as:
where k represents the peak signal level scaling constant, α ∈ [0,1 ]]Representing the intensity modulation index, h, of the light sourcebobRepresenting the channel vector of the target user, p representing the proportion of useful data symbol transmit power, d e-1, 1]Representing transmitted data symbols, zeveRepresenting the noise captured by the eavesdropping user Eve, it is clear that according to the above formula the eavesdropping user Eve is significantly affected by the disturbing artifacts.
In the above configuration of the spatially distributed or centralized visible light wireless transmitter, the signal-to-noise ratio (SNR) captured by the target user Bob is expressed as:
meanwhile, in the configuration of the spatially distributed visible light wireless transmitter, the signal-to-noise ratio (SNR) captured by the eavesdropping user Eve is expressed as:
under the configuration of the centralized visible light wireless transmitter, the signal-to-noise ratio (SNR) captured by the eavesdropping user Eve is expressed as:
where k represents the peak signal level scaling constant, α ∈ [0,1 ]]Representing the intensity modulation index, h, of the light sourcebobA channel vector representing a target user, p represents a proportion of useful data symbol transmit power,
representing the variance of the noise of the target user Bob,
representing the Eve noise variance of an eavesdropping user.
Obviously, the secret communication method of visible light can serve the spatial distribution type or centralized type visible light wireless transmitter configuration of the present invention, and the receiving signal-to-noise ratio of the potential eavesdropping user Eve is degraded by means of the heterogeneous artificial noise source, and at the same time, the receiving signal-to-noise ratio of the target user Bob is ensured, and the negative interference of the artificial noise is not received, so that the physical layer security level of the target user Bob is improved as a whole.
Conventional solid state commercial light source arrays based on homogeneous lambertian light source beams can only provide approximately or equal intensity visible light signal coverage at the same user orientation due to limitations in beam configuration. Therefore, a spatially distributed light source array is required to provide overlapping coverage of the differentiated multiple optical signals at the same user location, so as to provide a required link configuration basis for artificial noise scrambling for secure visible light communication. Once the application scenario does not have the above configuration basis of the distributed visible light emitter, and thus cannot provide the required differentiated overlapping coverage for the same user location, the artificial noise scrambling cannot operate normally, and the switchable artificial noise source cannot be aimed at the whole area except the target user receiving location.
Different from current single lambertian light source array, the utility model discloses with the help of centralized visible light wireless transmitter transmits non-lambertian wave beam, constructs the differentiation wave beam, makes it can provide differentiation multichannel light signal overlapping cover in same user position. Such coverage diversity is naturally derived from the diversity of spatial radiation characteristics between beams, without relying on spatially distributed transmitter configurations, thus overcoming the natural limitations of existing artificial noise scrambling schemes in secure visible light communication applications. Of course, the spatially distributed visible light wireless transmitter described above also overcomes the natural limitations of existing artificial noise scrambling schemes in secure visible light communication applications.
Secret communication method of visible light both with the help of the utility model provides a non-lambert light beam 2 that non-lambert light source 1 sent carries out the artifical scrambling of non-lambert, utilizes again the utility model provides a non-lambert light source 1 carries out the loading of communication data.
The above secret communication method of visible light supports both the configuration of a spatially centralized visible light wireless transmitter and the planar (distributed) access point geometry with strong compatibility.
Based on the aforesaid, in the secret communication of visible light is introduced to artificial noise scrambling technique, the utility model discloses be suitable for diversified application scene, the application scene mainly includes: (1) only mastering a heterogeneous non-Lambert secret visible light communication application scene of Channel State Information (CSI) of a target user; (2) the heterogeneous non-Lambert secret visible light communication application scenes of Channel State Information (CSI) of a target user and an eavesdropping user are mastered at the same time; (3) a secure visible light sensing application scenario based on a non-Lambertian commercial solid state light source; (4) visible light wireless application scenarios with only a single solid state light source emitter or a limited number of emitters; (5) an application scenario with customized requirements on the geometry of the light source emitter; (6) application scenarios with limited resources of the position of the visible light emitters on the ceiling.
Above technical feature constitutes the utility model discloses a best embodiment, it has stronger adaptability and best implementation effect, can increase and decrease unnecessary technical feature according to actual need, satisfies the demand of different situation.
Claims (7)
1. The visible light secret communication emitter device is characterized by comprising a combiner, a visible light wireless emitter, a driving circuit and a receiving end, wherein the combiner is electrically connected with the input end of the driving circuit, the output end of the driving circuit is electrically connected with the input end of the visible light wireless emitter, the visible light wireless emitter is a space-distributed visible light wireless emitter or a space-centralized visible light wireless emitter, the visible light wireless emitter in the space-distributed visible light wireless emitter or the space-centralized visible light wireless emitter adopts a non-Lambert emitter, the signal output end of the visible light wireless emitter is in communication connection with the input end of the receiving end, and the receiving end comprises a target user Bob and a potential eavesdropping user Eve.
2. A non-lambertian artificial scrambling assisted secret visible light communication transmitter device as claimed in claim 1 wherein the spatially distributed visible light wireless transmitters are N visible light wireless transmitters evenly distributed on the user's ceiling, N being greater than 1.
3. A non-lambertian artificial-scrambling assisted secret visible light communications transmitter device as claimed in claim 1 or 2 wherein the spatially centralized visible light wireless transmitter is a single visible light wireless transmitter placed on the user's ceiling, the single visible light wireless transmitter being composed of N sub-arrays of non-lambertian transmitters, N being greater than 1.
4. A non-lambertian artificially scrambled assisted visible light secret communication transmitter device according to claim 1 or 2, wherein the combiner combines the data signal and the artificial noise signal into a single data stream signal.
5. A non-lambertian artificial scrambling assisted secret visible light communication transmitter device as claimed in claim 3 wherein the combiner combines the data signal and the artificial noise signal into a single data stream signal.
6. A non-Lambertian artificial scrambling assisted secret visible light communication transmitter device as claimed in claim 1, 2 or 5 wherein the driving circuit comprises a DC source and a biaser, the DC source and biaser being electrically connected.
7. A non-lambertian artificial scrambling assisted secret visible light communication transmitter device as claimed in claim 3 wherein the drive circuit comprises a dc source and a biaser, the dc source and biaser being electrically connected.
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