Method, apparatus and system for signal enhancement and encryption based on ris

Abstract

The present disclosure relates to a method, device and system for RIS-based signal enhancement and encryption, the method comprising: receiving a target signal sent by a signal sending device, and determining a target RIS forwarding unit corresponding to the target signal from a plurality of RIS forwarding units; obtaining channel parameters of a target transmission channel corresponding to the target signal; adjusting the amplitude and phase corresponding to the target RIS forwarding unit according to the channel parameters; encrypting the target signal through the adjusted target RIS forwarding unit, and sending the encrypted target signal to a signal receiving device. In this way, RIS panels are deployed between the base station and the coverage blind area, the signal transmission strength of the photovoltaic power station room is enhanced by controlling the phase and amplitude of each RIS forwarding unit, the coverage blind area is eliminated, the control method is simple, the complexity is low, the cost and power consumption are small, and it is conducive to popularization and application.

Description

Technical Field

[0001] This disclosure relates to the field of wireless communication technology, and more specifically, to a method, apparatus, and system for signal enhancement and encryption based on RIS. Background Technology

[0002] With the development of new energy, new energy photovoltaic power stations have also become more widespread. However, due to the complex electromagnetic environment of the site and the constraints of the construction of operator base stations, as well as the weak transmission capability and easy obstruction of 5G signal high-frequency bands, the indoor wireless signal in the wireless equipment room of new energy photovoltaic power stations generally has blind spots and weak areas, resulting in low 5G signal reception strength, which affects data collection, information transmission and access on the side of new energy power stations. Summary of the Invention

[0003] To address the aforementioned issues, this disclosure provides a method, apparatus, and system for signal enhancement and encryption based on RIS.

[0004] In a first aspect, this disclosure provides a method for signal enhancement and encryption based on RIS (Reconfigurable Intelligent Surface) relay devices, wherein the RIS relay devices include multiple RIS relay units, each RIS relay unit corresponding to a reflection amplitude and phase, and the method includes:

[0005] Receive the target signal sent by the signal transmitting device, and determine the target RIS forwarding unit corresponding to the target signal from the plurality of RIS forwarding units;

[0006] Obtain the channel parameters of the target transmission channel corresponding to the target signal;

[0007] Adjust the amplitude and phase of the target RIS forwarding unit according to the channel parameters;

[0008] The target signal is encrypted by the adjusted target RIS forwarding unit, and the encrypted target signal is sent to the signal receiving device.

[0009] Optionally, the channel parameters of the target transmission channel corresponding to the target signal include the channel parameters of the first channel from the signal transmitting device to the RIS and the channel parameters of the second channel from the RIS to the signal receiving device. Obtaining the channel parameters of the target transmission channel corresponding to the target signal includes:

[0010] Obtain the equivalent signal of the target signal in the second channel;

[0011] Based on the equivalent signal, the channel parameters of the first channel and the channel parameters of the second channel are determined.

[0012] Optionally, the channel parameters include the channel response, and determining the channel parameters of the first channel and the channel parameters of the second channel based on the equivalent signal includes:

[0013] The wireless channel vector is determined based on the equivalent signal and the preset equivalent signal formula; the preset equivalent signal formula is: Where r represents the equivalent signal, h T The wireless channel vector representing the first channel, g T The wireless channel vector represents the second channel, Ψ represents the controllable reflection coefficient matrix introduced by the RIS panel, s represents the target signal, P represents the transmit power, and z represents the introduced noise.

[0014] By using a preset channel estimation method, the estimated channel response values ​​of the first channel and the second channel are determined based on the wireless channel vector.

[0015] Optionally, adjusting the amplitude and phase corresponding to the target RIS forwarding unit according to the channel parameters includes:

[0016] Based on the channel parameters, determine the amplitude and phase corresponding to the first channel and the amplitude and phase corresponding to the second channel, respectively.

[0017] The amplitude and phase of the target RIS forwarding unit are adjusted according to the amplitude and phase of the first channel and the amplitude and phase of the second channel.

[0018] Optionally, determining the amplitude and phase corresponding to the first channel and the amplitude and phase corresponding to the second channel based on the channel parameters includes:

[0019] Based on the first preset estimation formula, the amplitude estimate and phase estimate of the first channel are determined using the channel response estimate of the first channel; the first preset estimation formula is: in, The estimated channel response of the first channel. The amplitude estimate characterizing the channel response of the first channel. The phase estimate characterizing the channel response of the first channel;

[0020] According to the second preset estimation formula, the amplitude estimate and phase estimate of the second channel are determined using the channel response estimate of the second channel; the second preset estimation formula is: in, The estimated channel response characterizing the second channel. The amplitude estimate characterizing the channel response of the second channel. Phase estimates characterizing the channel response of the second channel.

[0021] Optionally, adjusting the amplitude and phase corresponding to the target RIS forwarding unit based on the amplitude and phase corresponding to the first channel and the amplitude and phase corresponding to the second channel includes:

[0022] Based on the phase corresponding to the first channel and the phase corresponding to the second channel, the phase corresponding to the target RIS forwarding unit is calculated using a preset phase formula; the preset phase formula is: Where, ψ n Characterizing the phase corresponding to the target RIS forwarding unit;

[0023] The phase corresponding to the target RIS forwarding unit is adjusted to ensure that the phase corresponding to the second channel is consistent with the phase corresponding to the first channel; based on the amplitude corresponding to the first channel and the amplitude corresponding to the second channel, the amplitude corresponding to the target RIS forwarding unit is determined using a preset amplitude formula; the preset amplitude formula is: Among them, A n The amplitude corresponding to the target RIS forwarding unit is represented by N, and N represents the number of RIS forwarding units.

[0024] Optionally, encrypting the target signal using the adjusted target RIS forwarding unit includes:

[0025] The phase of the target RIS forwarding unit is encrypted using a preset encryption formula and a preset phase formula, based on a pseudo-random phase perturbation generated by a chaotic sequence.

[0026] Optionally, the preset encryption formula is δ(iT) s )=2πX i Where i represents the symbol period, X i Characterizing a chaotic sequence, X i+1 =μX i (1-X i ), μ∈(0,4],X i ∈(0,1), i=0,1,2..., the step of encrypting the phase of the target RIS forwarding unit based on the pseudo-random phase perturbation generated by the chaotic sequence through a preset encryption formula and a preset phase formula includes:

[0027] Based on the preset encryption formula and the preset phase formula, the preset encryption phase formula is determined; the preset encryption phase formula is:

[0028] The phase of the target RIS forwarding unit is encrypted using the preset encryption phase formula.

[0029] Secondly, this disclosure also provides a RIS-based signal enhancement and encryption device applied to a reconfigurable smart surface RIS forwarding device. The RIS forwarding device includes multiple RIS forwarding units, each corresponding to a reflection amplitude and phase. The device includes:

[0030] A receiving module is used to receive a target signal sent by a signal transmitting device and determine the target RIS forwarding unit corresponding to the target signal from the plurality of RIS forwarding units;

[0031] The acquisition module is used to acquire the channel parameters of the target transmission channel corresponding to the target signal;

[0032] The adjustment module is used to adjust the amplitude and phase corresponding to the target RIS forwarding unit according to the channel parameters;

[0033] The transmitting module is used to encrypt the target signal through the adjusted target RIS forwarding unit and transmit the encrypted target signal to the signal receiving device.

[0034] Optionally, the channel parameters of the target transmission channel corresponding to the target signal include the channel parameters of the first channel from the signal transmitting device to the RIS and the channel parameters of the second channel from the RIS to the signal receiving device.

[0035] The acquisition module is used to acquire the channel parameters of the first channel; determine the equivalent signal of the target signal in the second channel based on the channel parameters of the first channel; and determine the channel parameters of the second channel based on the equivalent signal.

[0036] Optionally, the channel parameters include the channel response, and the acquisition module is used to determine the wireless channel vector based on the equivalent signal and a preset equivalent signal formula; the preset equivalent signal formula is: Where r represents the equivalent signal, h T The wireless channel vector representing the first channel, g T The wireless channel vector represents the second channel, Ψ represents the controllable reflection coefficient matrix introduced by the RIS panel, s represents the target signal, P represents the transmit power, and z represents the introduced noise.

[0037] By using a preset channel estimation method, the estimated channel response values ​​of the first channel and the second channel are determined based on the wireless channel vector.

[0038] Optionally, the adjustment module is configured to determine the amplitude and phase corresponding to the first channel and the amplitude and phase corresponding to the second channel according to the channel parameters; and adjust the amplitude and phase corresponding to the target RIS forwarding unit according to the amplitude and phase corresponding to the first channel and the amplitude and phase corresponding to the second channel.

[0039] Optionally, the adjustment module is used to determine the amplitude estimate and phase estimate corresponding to the first channel based on the channel response estimate of the first channel using a first preset estimation formula; the first preset estimation formula is: in, The estimated channel response of the first channel. The amplitude estimate characterizing the channel response of the first channel. The phase estimate characterizing the channel response of the first channel;

[0040] According to the second preset estimation formula, the amplitude estimate and phase estimate of the second channel are determined using the channel response estimate of the second channel; the second preset estimation formula is: in, The estimated channel response characterizing the second channel. The amplitude estimate characterizing the channel response of the second channel. Phase estimates characterizing the channel response of the second channel.

[0041] Optionally, the adjustment module is configured to calculate the phase corresponding to the target RIS forwarding unit based on the phase corresponding to the first channel and the phase corresponding to the second channel, using a preset phase formula; the preset phase formula is: Where, ψ n Characterize the phase corresponding to the target RIS forwarding unit; adjust the phase corresponding to the target RIS forwarding unit to make the phase corresponding to the second channel consistent with the phase corresponding to the first channel; determine the amplitude corresponding to the target RIS forwarding unit according to the amplitude corresponding to the first channel and the amplitude corresponding to the second channel, using a preset amplitude formula; the preset amplitude formula is: Among them, A n The amplitude corresponding to the target RIS forwarding unit is represented by N, and N represents the number of RIS forwarding units.

[0042] Optionally, the sending module is used to encrypt the phase of the target RIS forwarding unit based on a pseudo-random phase perturbation generated by a chaotic sequence using a preset encryption formula and a preset phase formula.

[0043] Optionally, the preset encryption formula is δ(iT) s )=2πX iWhere i represents the symbol period, X i Characterizing a chaotic sequence, X i+1 =μX i (1-X i ), μ∈(0,4],X i ∈(0,1), i=0,1,2..., the sending module is used to determine the preset encryption phase formula according to the preset encryption formula and the preset phase formula; the preset encryption phase formula is:

[0044] The phase of the target RIS forwarding unit is encrypted using the preset encryption phase formula.

[0045] Thirdly, this disclosure provides a RIS-based signal enhancement and encryption system, including: a reconfigurable smart surface RIS forwarding device, a signal transmitting device, and a signal receiving device;

[0046] The signal transmitting device is used to transmit the target signal;

[0047] The signal receiving device is used to receive the target signal;

[0048] The reconfigurable smart surface RIS forwarding device is used to implement the above-mentioned RIS-based signal enhancement and encryption method.

[0049] The above technical solution involves receiving a target signal transmitted by a signal transmitting device and determining the target RIS forwarding unit corresponding to the target signal from the plurality of RIS forwarding units; obtaining the channel parameters of the target transmission channel corresponding to the target signal; adjusting the amplitude and phase corresponding to the target RIS forwarding unit according to the channel parameters; encrypting the target signal through the adjusted target RIS forwarding unit; and transmitting the encrypted target signal to the signal receiving device. In this way, deploying a RIS panel between the base station and the coverage blind spot, and controlling the phase and amplitude of each RIS forwarding unit, enhances the signal transmission strength of the photovoltaic power station's equipment room, eliminates coverage blind spots, and improves the security of the target signal by encrypting the target signal through the RIS forwarding unit. Furthermore, the control method is simple, low in complexity, and has low cost and power consumption, making it conducive to widespread application.

[0050] Other features and advantages of this disclosure will be described in detail in the following detailed description section. Attached Figure Description

[0051] The accompanying drawings are provided to further illustrate the present disclosure and form part of the specification. They are used together with the following detailed description to explain the present disclosure, but do not constitute a limitation thereof. In the drawings:

[0052] Figure 1 This application illustrates a scenario of signal transmission within a photovoltaic power station according to an exemplary embodiment.

[0053] Figure 2 This application illustrates a flowchart of a RIS-based signal enhancement and encryption method according to an exemplary embodiment.

[0054] Figure 3 This is a flowchart illustrating another RIS-based signal enhancement and encryption method according to an exemplary embodiment of this application;

[0055] Figure 4 This application illustrates a block diagram of a RIS-based signal enhancement and encryption device according to an exemplary embodiment.

[0056] Figure 5 This application illustrates a system block diagram of RIS-based signal enhancement and encryption according to an exemplary embodiment. Detailed Implementation

[0057] The specific embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are for illustration and explanation only and are not intended to limit this disclosure.

[0058] It should be noted that all actions involving the acquisition of signals, information, or data in this disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the location is situated, and with authorization from the owner of the relevant device.

[0059] First, the application scenario of this application will be described. This application is applied to the scenario of signal transmission within a photovoltaic power station, such as... Figure 1 As shown, the signal transmitting device can be a base station, and the signal receiving device can be a computer room device. There is obstruction between the base station and the computer room device in the photovoltaic power station. When using 5G signal, due to the weak transmission capability and easy obstruction of the high frequency band of 5G signal, the computer room device is in a blind spot. Figure 1 In the illustrated embodiment, the RIS is mounted on the exterior wall of a building. In actual deployment, the RIS can be mounted on building exterior walls, ceilings, windows, streetlights, etc. The principle for selecting the RIS mounting location is to ensure as few obstructions as possible between the base station and the RIS, and between the RIS and the target coverage area. This achieves line-of-sight communication between the base station and the RIS, and between the RIS and the target coverage area, creating an unobstructed propagation path for the original coverage blind spots and significantly improving the 5G signal strength received in the blind spots. The RIS can change the electromagnetic response of the transponder unit, including its phase and amplitude, by changing the electrical parameters of the tunable element.

[0060] Because signal receiving rooms in photovoltaic power plants generally have blind spots and weak areas in signal reception, this has a significant impact on data acquisition, information transmission, and access at new energy power plants.

[0061] Currently, solutions to the aforementioned technical problems include: macrocell coupling access, microcell wired access, and RRU (Remote Radio Unit) access.

[0062] Among them, the macrocell coupling access method avoids signal reception blind spots and weak areas by increasing the output power of outdoor base stations. However, this only increases the downlink communication signal strength to make the communication signal entering the room stronger. It does not solve the problem of communication signal attenuation when passing through obstacles in principle. At the same time, this method is also accompanied by defects such as high energy consumption and high radiation.

[0063] Microcell wired access uses microcell base stations as the signal source for the signal distribution system. Due to the lower power of microcells, they are suitable for indoor coverage. Compared to macrocells, microcells offer a better indoor system solution. Microcells provide significantly higher call quality than macrocells, have minimal impact on macrocell wireless performance, and increase network capacity. However, microcells are more expensive, require frequency planning, necessitate the construction of additional transmission systems, and involve substantial network optimization work.

[0064] Radio frequency extension is achieved using a BBU (Building Baseband Unit) + RRU configuration to provide a signal source for the indoor distribution system. The BBU and RRU are connected via fiber optic cable. This method offers good coverage but incurs high costs.

[0065] Therefore, to address the aforementioned indoor signal issues in distributed photovoltaic power stations, this application provides a method, apparatus, storage device, and system for signal enhancement and encryption based on a signal transmission system (RIS), considering factors such as power consumption, radiation, signal quality, cost, and equipment complexity. The method involves receiving a target signal transmitted by a signal transmitting device and determining the target RIS forwarding unit corresponding to the target signal from multiple RIS forwarding units; obtaining the channel parameters of the target transmission channel corresponding to the target signal; adjusting the amplitude and phase of the target RIS forwarding unit based on the channel parameters; and transmitting the target signal to the signal receiving device through the adjusted target RIS forwarding unit. This approach, by deploying a RIS panel between the base station and coverage blind spots, and controlling the phase and amplitude of each RIS forwarding unit, enhances the signal transmission strength of the photovoltaic power station's equipment room, eliminates coverage blind spots, and offers a simple, low-complexity control method with low cost and power consumption, thus facilitating widespread application.

[0066] The present disclosure will now be described in conjunction with specific embodiments.

[0067] Figure 2 This application discloses a RIS-based signal enhancement and encryption method according to an exemplary embodiment, applied to a reconfigurable smart surface RIS forwarding device. The RIS forwarding device includes multiple RIS forwarding units, each corresponding to a reflection amplitude and phase, such as... Figure 2 As shown, the method includes:

[0068] S201. Receive the target signal sent by the signal transmitting device, and determine the target RIS forwarding unit corresponding to the target signal from the plurality of RIS forwarding units.

[0069] First, the position of the RIS (Reflector System) is adjusted according to the predetermined locations of the signal transmitting and receiving devices, so that the adjusted RIS can reflect the received target signal back to the signal receiving device. The RIS consists of N forwarding units, where N is a positive integer. The nth forwarding unit of the RIS (n = 1, ..., N) has an adjustable reflection amplitude A. n and phase shift ψ n The reflection amplitude A of all forwarding units n and phase shift ψ n The size of the parameters (n = 1, ..., N) is controlled by the external control template of the RIS. When the RIS receives the target signal, the RIS forwarding unit that receives the target signal is determined to be the target RIS forwarding unit.

[0070] S202. Obtain the channel parameters of the target transmission channel corresponding to the target signal.

[0071] The channel parameters of the target transmission channel corresponding to the target signal include the channel parameters of the first channel from the signal transmitting device to the RIS and the channel parameters of the second channel from the RIS to the signal receiving device.

[0072] In some embodiments, the equivalent signal of the target signal in the second channel can be obtained; based on the equivalent signal, the channel parameters of the first channel and the channel parameters of the second channel are determined. The channel parameters include the channel response.

[0073] In one possible implementation, a wireless channel vector is determined based on the equivalent signal and a preset equivalent signal formula. Then, using a preset channel estimation method, the channel response estimates of the first channel and the second channel are determined based on the wireless channel vector.

[0074] For example, the preset equivalent signal formula is as follows:

[0075]

[0076] Where r represents the equivalent signal, and h = [h1, h2, ..., h N ] T The wireless channel vector representing the first channel from the signal transmitting device to the RIS, g = [g1, g2, ..., g N ] T Let be the wireless channel vector of the second channel from RIS to the signal receiving device, with the superscript T representing matrix conjugation. s is the target signal, P is the transmit power, and z is the noise introduced by the transmission link and the signal receiving device. The controllable reflection coefficient matrix introduced for RIS panels, where diag represents a diagonal matrix. h n h represents the channel response from the signal transmitting device to the nth relay unit (n = 1, ..., N). n The amplitude is |h n |, phase is θ n ,Right now g n For the channel response of the nth forwarding unit (n = 1, ..., N) to the second channel of the signal receiving device, g n The amplitude is |g n |, phase is φ n ,Right now

[0077] For example, the preset channel estimation method can be the least squares method or the minimum mean square error method, etc. There are no restrictions here. The least squares method can be used to perform alternating calculations, and the optimal function matching result of the data can be found by minimizing the sum of squared errors to determine the estimated values ​​of the channel parameters of the first channel and the estimated values ​​of the channel parameters of the second channel; or, the minimum mean square error method can be used to estimate the channel parameters of the first channel and the channel parameters of the second channel to obtain the corresponding estimated values.

[0078] In this way, based on the equivalent signal, the channel parameters of the first and second channels can be estimated more accurately using the preset channel estimation method, which is beneficial to the transmission of the target signal.

[0079] S203. Adjust the amplitude and phase of the target RIS forwarding unit according to the channel parameters.

[0080] In some embodiments, the amplitude and phase corresponding to the first channel and the amplitude and phase corresponding to the second channel can be determined according to the channel parameters; and the amplitude and phase corresponding to the target RIS forwarding unit can be adjusted according to the amplitude and phase corresponding to the first channel and the amplitude and phase corresponding to the second channel.

[0081] For example, based on the first preset estimation formula, the amplitude estimate and phase estimate of the first channel are determined by the channel response estimate of the first channel; based on the second preset estimation formula, the amplitude estimate and phase estimate of the second channel are determined by the channel response estimate of the second channel.

[0082] The first preset estimation formula is: The channel response estimate of the first channel is used to determine the phase estimate of the first channel according to the first preset estimation formula. and amplitude estimate ,in, for The estimated value, representing the amplitude estimate of the channel response of the first channel, For θ n The estimated value represents the phase estimate of the channel response of the first channel; the second preset estimation formula is: The estimated channel response value characterizing the second channel is used to determine the phase corresponding to the second channel based on the second preset estimation formula. and amplitude in, For |g n The estimated value of | represents the amplitude estimate of the channel response of the second channel. For φ n The estimated value is the phase estimate that characterizes the channel response of the second channel.

[0083] In other embodiments, the phase and amplitude of the target RIS forwarding unit can be adjusted according to the phase corresponding to the first channel and the phase corresponding to the second channel, and the phase of the target RIS forwarding unit can be encrypted by pseudo-random phase perturbation generated by chaotic sequence.

[0084] For example, based on the phase corresponding to the first channel and the phase corresponding to the second channel, the phase corresponding to the target RIS forwarding unit is calculated using a preset phase formula; the preset phase formula is: Where, ψ n Characterize the phase corresponding to the target RIS forwarding unit; adjust the phase corresponding to the target RIS forwarding unit to make the phase corresponding to the second channel consistent with the phase corresponding to the first channel; determine the amplitude corresponding to the target RIS forwarding unit according to the amplitude corresponding to the first channel and the amplitude corresponding to the second channel, using a preset amplitude formula; the preset amplitude formula is: Among them, A n The magnitude of the target RIS forwarding unit is represented by N, and the number of RIS forwarding units is represented by N.

[0085] In this way, the RIS forwarding unit is adjusted according to the channel parameters of the first channel and the channel parameters of the second channel so that the phase of the target signal received by the RIS and the phase of the signal forwarded by the RIS are consistent, reducing the phase cancellation of the signals and facilitating the transmission of the target signal. Furthermore, the amplitude of the RIS forwarding unit is allocated according to the amplitude of the target signal, ensuring that the target signal can be transmitted equivalently according to the signal strength.

[0086] S204. The target signal is encrypted by the adjusted target RIS forwarding unit, and the encrypted target signal is sent to the signal receiving device.

[0087] For security reasons, the RIS forwarding unit can encrypt the target signal based on the adjusted amplitude and phase, and then forward the encrypted target signal to the signal receiving device.

[0088] For example, the phase of the target RIS forwarding unit can be encrypted using a preset encryption formula and a preset phase formula, based on a pseudo-random phase perturbation generated by a chaotic sequence.

[0089] For example, the preset encryption formula could be δ(iT) s )=2πX i Where i represents the symbol period, X i Characterizing a chaotic sequence, X i+1 =μX i (1-X i ), μ∈(0,4],X i For each ∈(0,1), i=0,1,2..., based on the preset encryption formula and the preset phase formula, the preset encryption phase formula is determined; the preset encryption phase formula is: The phase of the target RIS forwarding unit is encrypted using the preset encryption phase formula.

[0090] Among them, X i To characterize a chaotic sequence, a one-dimensional Logistic chaotic sequence (or other chaotic sequences, such as two-dimensional Henon chaotic sequences or three-dimensional Lorenz chaotic sequences, are acceptable; here, we take a one-dimensional Logistic chaotic sequence as an example) can be used. Its mathematical form, generated with the i-th symbol period, is as follows:

[0091] X i+1 =μX i (1-X i μ∈(0,4],X i ∈(0,1), i=0,1,2...

[0092] Where μ is the Logistic parameter, and its value ranges from 3.5699456 < μ ≤ 4. When the Logistic mapping enters a chaotic state, the generated chaotic sequence {X} is obtained. i The sequence |i=0,1,2...} exhibits a pseudo-random distribution. This sequence is aperiodic, non-convergent, and extremely sensitive to the initial value X0, making it an ideal pseudo-random sequence suitable for encrypting the phase. The initial value X0 ranges from (0,1) and represents the shared encryption key held by the RIS and the signal receiving device. Thus, by applying chaotic encryption to the phase of the RIS reflected signal, the security of the target signal can be effectively guaranteed.

[0093] Using the above method, a target RIS forwarding unit corresponding to the target signal is determined from multiple RIS forwarding units after receiving the target signal transmitted by the signal transmitting device. The channel parameters of the target transmission channel corresponding to the target signal are obtained. Based on the channel parameters, the amplitude and phase of the target RIS forwarding unit are adjusted. The target signal is then encrypted using the adjusted target RIS forwarding unit, and the encrypted target signal is transmitted to the signal receiving device. In this way, by deploying RIS panels between the base station and the coverage blind spot, and by controlling the phase and amplitude of each RIS forwarding unit, the signal transmission strength of the photovoltaic power station's equipment room is enhanced, coverage blind spots are eliminated, and the security of the target signal is improved through encryption of the target signal using the RIS forwarding unit. Furthermore, the control method is simple, low in complexity, and has low cost and power consumption, making it conducive to widespread application.

[0094] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.

[0095] Figure 3 This application illustrates another RIS-based signal enhancement and encryption method according to an exemplary embodiment, applicable to a RIS-based signal enhancement and encryption system, such as... Figure 3 As shown, the method includes:

[0096] S301. The wireless channel vectors h and g are estimated using a preset channel estimation method to obtain the estimated values ​​of amplitude and phase corresponding to the first channel and the estimated values ​​of amplitude and phase corresponding to the second channel, respectively.

[0097] Where h is the wireless channel vector of the first channel and g is the wireless channel vector of the second channel, the wireless channel vector can be determined by a preset equivalent signal formula, which is shown below: Where r represents the equivalent signal, h T The wireless channel vector representing the first channel, g TThe wireless channel vector represents the second channel, Ψ represents the controllable reflection coefficient matrix introduced by the RIS panel, s represents the target signal, P represents the transmit power, and z represents the introduced noise.

[0098] Using a preset channel estimation method, the estimated channel response values ​​of the first channel and the second channel are determined based on the wireless channel vector. Then, the estimated channel response values ​​are determined according to the first preset estimation formula. Determine the estimated values ​​of amplitude and phase corresponding to the first channel, and then use the second preset estimation formula. Determine the estimated values ​​of amplitude and phase corresponding to the second channel.

[0099] S302, Based on the estimated amplitude and phase values ​​corresponding to the first channel. And the estimated values ​​of amplitude and phase corresponding to the second channel. Through a preset phase encryption formula and preset amplitude formula Determine the amplitude and phase corresponding to the target RIS forwarding unit.

[0100] Each through a preset phase formula and preset amplitude formula The amplitude and phase of the target RIS forwarding unit are determined. Furthermore, for signal security reasons, a preset encrypted phase formula can be used. Determine the phase corresponding to the target RIS forwarding unit.

[0101] S303. According to the RIS's preset encryption phase formula, the signal receiving device uses the demodulation formula... The received target signal is decrypted.

[0102] In order to achieve decryption, the signal receiving device needs to demodulate the received target signal. The demodulation formula can be as follows: Where r represents the received encrypted signal, and r‵ represents the demodulated signal.

[0103] Figure 4 This application discloses a RIS-based signal enhancement and encryption device according to an exemplary embodiment, applied to a reconfigurable smart surface RIS forwarding device. The RIS forwarding device includes multiple RIS forwarding units, each corresponding to a reflection amplitude and phase. The device includes:

[0104] The receiving module 401 is used to receive the target signal sent by the signal transmitting device and determine the target RIS forwarding unit corresponding to the target signal from the plurality of RIS forwarding units;

[0105] The acquisition module 402 is used to acquire the channel parameters of the target transmission channel corresponding to the target signal;

[0106] The adjustment module 403 is used to adjust the amplitude and phase of the target RIS forwarding unit according to the channel parameters.

[0107] The transmitting module 404 is used to encrypt the target signal through the adjusted target RIS forwarding unit and send the encrypted target signal to the signal receiving device.

[0108] Optionally, the channel parameters of the target transmission channel corresponding to the target signal include the channel parameters of the first channel from the signal transmitting device to the RIS and the channel parameters of the second channel from the RIS to the signal receiving device.

[0109] The acquisition module 402 is used to acquire the channel parameters of the first channel; determine the equivalent signal of the target signal in the second channel based on the channel parameters of the first channel; and determine the channel parameters of the second channel based on the equivalent signal.

[0110] Optionally, the channel parameters include the channel response. The acquisition module 402 is used to determine the wireless channel vector based on the equivalent signal and a preset equivalent signal formula; the preset equivalent signal formula is: Where r represents the equivalent signal, h T The wireless channel vector representing the first channel, g T The wireless channel vector represents the second channel, Ψ represents the controllable reflection coefficient matrix introduced by the RIS panel, s represents the target signal, P represents the transmit power, and z represents the introduced noise.

[0111] By using a preset channel estimation method, the estimated channel response values ​​of the first channel and the second channel are determined based on the wireless channel vector.

[0112] Optionally, the adjustment module 403 is used to determine the amplitude and phase corresponding to the first channel and the amplitude and phase corresponding to the second channel according to the channel parameters; and adjust the amplitude and phase corresponding to the target RIS forwarding unit according to the amplitude and phase corresponding to the first channel and the amplitude and phase corresponding to the second channel.

[0113] Optionally, the adjustment module 403 is used to determine the amplitude estimate and phase estimate of the first channel based on the channel response estimate of the first channel using a first preset estimation formula; the first preset estimation formula is: in, The estimated channel response of the first channel. The amplitude estimate characterizing the channel response of the first channel. The phase estimate characterizing the channel response of the first channel;

[0114] According to the second preset estimation formula, the amplitude estimate and phase estimate of the second channel are determined using the channel response estimate of the second channel; the second preset estimation formula is as follows: in, The estimated channel response characterizing the second channel. The amplitude estimate characterizing the channel response of the second channel. Phase estimates characterizing the channel response of the second channel.

[0115] Optionally, the adjustment module 403 is used to calculate the phase corresponding to the target RIS forwarding unit based on the phase corresponding to the first channel and the phase corresponding to the second channel, using a preset phase formula; the preset phase formula is: Where, ψ n Characterize the phase corresponding to the target RIS forwarding unit; adjust the phase corresponding to the target RIS forwarding unit to make the phase corresponding to the second channel consistent with the phase corresponding to the first channel; determine the amplitude corresponding to the target RIS forwarding unit according to the amplitude corresponding to the first channel and the amplitude corresponding to the second channel, using a preset amplitude formula; the preset amplitude formula is: Among them, A n The magnitude of the target RIS forwarding unit is represented by N, and the number of RIS forwarding units is represented by N.

[0116] Optionally, the sending module 404 is used to encrypt the phase of the target RIS forwarding unit based on a pseudo-random phase perturbation generated by a chaotic sequence using a preset encryption formula and a preset phase formula.

[0117] Optionally, the preset encryption formula is δ(iT) s )=2πX i Where i represents the symbol period, X i Characterizing a chaotic sequence, X i+1 =μX i (1-X i ), μ∈(0,4],X i ∈(0,1), i=0,1,2..., the sending module 404 is used to determine the preset encryption phase formula according to the preset encryption formula and the preset phase formula; the preset encryption phase formula is:

[0118] The phase of the target RIS forwarding unit is encrypted using the preset encryption phase formula.

[0119] Using the above-described apparatus, a target RIS forwarding unit corresponding to the target signal is determined from the plurality of RIS forwarding units after receiving the target signal transmitted by the signal transmitting device. The channel parameters of the target transmission channel corresponding to the target signal are obtained. Based on the channel parameters, the amplitude and phase of the target RIS forwarding unit are adjusted. The target signal is then transmitted to the signal receiving device through the adjusted target RIS forwarding unit. In this way, by deploying RIS panels between the base station and the coverage blind spot, and by controlling the phase and amplitude of each RIS forwarding unit, the signal transmission strength of the photovoltaic power station's equipment room is enhanced, coverage blind spots are eliminated, and the control method is simple, low in complexity, and has low cost and power consumption, which is conducive to its widespread application.

[0120] Figure 4 This application illustrates a RIS-based signal enhancement and encryption system according to an exemplary embodiment. The system includes a signal transmitting device 401, a reconfigurable smart surface RIS forwarding device 402, and a signal receiving device 403.

[0121] The signal transmitting device 401 is used to transmit the target signal;

[0122] The signal receiving device 403 is used to receive the target signal;

[0123] The reconfigurable smart surface RIS forwarding device 402 is used to implement the above-mentioned RIS-based signal enhancement and encryption method.

[0124] In addition, the signal receiving device also includes a consistent encryption key shared with RIS, used to decrypt the received target signal.

[0125] By deploying a RIS panel between the base station and the coverage blind spot using the above system, and by controlling the phase and amplitude of each forwarding unit of the RIS, the signal transmission strength of the photovoltaic power station room is enhanced, the coverage blind spot is eliminated, and the encryption protection of the target signal is increased, thereby improving the security of the target signal transmission. Moreover, the control method is simple, the complexity is low, and the cost and power consumption are relatively small, which is conducive to its widespread application.

[0126] In another exemplary embodiment, a computer program product is also provided, the computer program product comprising a computer program executable by a programmable device, the computer program having a code portion for performing the above-described RIS-based signal enhancement and encryption method when executed by the programmable device.

[0127] The preferred embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. However, this disclosure is not limited to the specific details of the above embodiments. Within the scope of the technical concept of this disclosure, various simple modifications can be made to the technical solutions of this disclosure, and these simple modifications all fall within the protection scope of this disclosure.

[0128] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, this disclosure will not describe the various possible combinations separately.

[0129] Furthermore, various different embodiments of this disclosure can be combined in any way, as long as they do not violate the spirit of this disclosure, they should also be regarded as the content disclosed in this disclosure.

Claims

1. A method for signal enhancement and encryption based on RIS, characterized in that, The method, applied to a reconfigurable smart surface RIS forwarding device, wherein the RIS forwarding device includes multiple RIS forwarding units, each RIS forwarding unit corresponding to a reflection amplitude and phase, includes: Receive the target signal sent by the signal transmitting device, and determine the target RIS forwarding unit corresponding to the target signal from the plurality of RIS forwarding units; Obtain the channel parameters of the target transmission channel corresponding to the target signal; wherein, the channel parameters of the target transmission channel corresponding to the target signal include the channel parameters of the first channel from the signal transmitting device to the RIS and the channel parameters of the second channel from the RIS to the signal receiving device; Adjust the amplitude and phase of the target RIS forwarding unit according to the channel parameters; The target signal is encrypted by the adjusted target RIS forwarding unit, and the encrypted target signal is sent to the signal receiving device. The encryption of the target signal through the adjusted target RIS forwarding unit includes: The phase of the target RIS forwarding unit is encrypted using a preset encryption formula and a preset phase formula, based on a pseudo-random phase perturbation generated by a chaotic sequence. Wherein, the preset encryption formula is ,in, Characterizing symbol periodicity, Characterizing chaotic sequences, , ; The preset phase formula is: ,in, Characterizing the phase corresponding to the target RIS forwarding unit, The phase estimate characterizing the channel response of the first channel. The phase estimate characterizing the channel response of the second channel; The step of encrypting the phase of the target RIS forwarding unit based on a pseudo-random phase perturbation generated by a chaotic sequence using a preset encryption formula and a preset phase formula includes: Based on the preset encryption formula and the preset phase formula, the preset encryption phase formula is determined; the preset encryption phase formula is: ; The phase of the target RIS forwarding unit is encrypted using the preset encryption phase formula.

2. The method according to claim 1, characterized in that, The method of obtaining the channel parameters of the target transmission channel corresponding to the target signal includes: Obtain the equivalent signal of the target signal in the second channel; Based on the equivalent signal, determine the channel parameters of the first channel and the channel parameters of the second channel.

3. The method according to claim 2, characterized in that, The channel parameters include the channel response, and determining the channel parameters of the first channel and the second channel based on the equivalent signal includes: The wireless channel vector is determined based on the equivalent signal and the preset equivalent signal formula; the preset equivalent signal formula is: ,in, r Characterize the equivalent signal, The wireless channel vector characterizing the first channel. The wireless channel vector represents the second channel, Ψ represents the controllable reflection coefficient matrix introduced by the RIS panel, s represents the target signal, P represents the transmit power, and z represents the introduced noise. By using a preset channel estimation method, the estimated channel response values ​​of the first channel and the second channel are determined based on the wireless channel vector.

4. The method according to claim 1, characterized in that, The step of adjusting the amplitude and phase corresponding to the target RIS forwarding unit according to the channel parameters includes: Based on the channel parameters, determine the amplitude and phase corresponding to the first channel and the amplitude and phase corresponding to the second channel, respectively. The amplitude and phase of the target RIS forwarding unit are adjusted according to the amplitude and phase of the first channel and the amplitude and phase of the second channel.

5. The method according to claim 4, characterized in that, The step of determining the amplitude and phase corresponding to the first channel and the amplitude and phase corresponding to the second channel based on the channel parameters includes: Based on the first preset estimation formula, the amplitude estimate and phase estimate of the first channel are determined using the channel response estimate of the first channel; the first preset estimation formula is: ,in, The estimated channel response of the first channel. The amplitude estimate characterizing the channel response of the first channel; According to the second preset estimation formula, the amplitude estimate and phase estimate of the second channel are determined using the channel response estimate of the second channel; the second preset estimation formula is: ,in, The estimated channel response characterizing the second channel. The amplitude estimate characterizing the channel response of the second channel.

6. The method according to claim 5, characterized in that, The step of adjusting the amplitude and phase corresponding to the target RIS forwarding unit according to the amplitude and phase corresponding to the first channel and the amplitude and phase corresponding to the second channel includes: Based on the phase corresponding to the first channel and the phase corresponding to the second channel, the phase corresponding to the target RIS forwarding unit is calculated using a preset phase formula; The phase corresponding to the target RIS forwarding unit is adjusted to ensure that the phase corresponding to the second channel is consistent with the phase corresponding to the first channel; based on the amplitude corresponding to the first channel and the amplitude corresponding to the second channel, the amplitude corresponding to the target RIS forwarding unit is determined using a preset amplitude formula; the preset amplitude formula is: ,in, A n Characterizing the amplitude corresponding to the target RIS forwarding unit, N Characterizes the number of RIS forwarding units.

7. A RIS-based signal enhancement and encryption device, characterized in that, An application is made to a reconfigurable smart surface RIS forwarding device, the RIS forwarding device comprising multiple RIS forwarding units, each RIS forwarding unit corresponding to a reflection amplitude and phase, the device comprising: A receiving module is used to receive a target signal sent by a signal transmitting device and determine the target RIS forwarding unit corresponding to the target signal from the plurality of RIS forwarding units; The acquisition module is used to acquire the channel parameters of the target transmission channel corresponding to the target signal; wherein, the channel parameters of the target transmission channel corresponding to the target signal include the channel parameters of the first channel from the signal transmitting device to the RIS and the channel parameters of the second channel from the RIS to the signal receiving device; The adjustment module is used to adjust the amplitude and phase corresponding to the target RIS forwarding unit according to the channel parameters; The transmitting module is used to encrypt the target signal through the adjusted target RIS forwarding unit and transmit the encrypted target signal to the signal receiving device; The encryption of the target signal through the adjusted target RIS forwarding unit includes: The phase of the target RIS forwarding unit is encrypted using a preset encryption formula and a preset phase formula, based on a pseudo-random phase perturbation generated by a chaotic sequence. Wherein, the preset encryption formula is ,in, Characterizing symbol periodicity, Characterizing chaotic sequences, , ; The preset phase formula is: ,in, Characterizing the phase corresponding to the target RIS forwarding unit, The phase estimate characterizing the channel response of the first channel. The phase estimate characterizing the channel response of the second channel; The sending module is specifically used to determine the preset encryption phase formula based on the preset encryption formula and the preset phase formula; the preset encryption phase formula is: The phase of the target RIS forwarding unit is encrypted using the preset encryption phase formula.

8. A RIS-based signal enhancement and encryption system, characterized in that, include: Reconfigurable smart surface RIS forwarding device, signal transmitting device, and signal receiving device; The signal transmitting device is used to transmit the target signal; The signal receiving device is used to receive the target signal; The reconfigurable smart surface RIS forwarding device is used to implement the method of any one of claims 1 to 6.

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