CN116961764B - Modulated reflection wireless optical communication system and method enhanced by RIS - Google Patents
Modulated reflection wireless optical communication system and method enhanced by RIS Download PDFInfo
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Abstract
The invention provides a modulation reflection wireless optical communication system and a method adopting RIS enhancement, wherein an MR modulation reflector is deployed at a reflection node and comprises a plurality of RIS modules which are deployed in different areas and are mutually independent, and an active node corresponds to at least one RIS module. After the active node sends information to the reflecting node, the reflecting node judges whether the information of the active node belongs to a type to be forwarded, when the information sent by the active node is the type to be forwarded, the reflecting node sends the information to be forwarded to a designated active node through a corresponding RIS module, and when the reflecting node judges that the information sent by the active node belongs to the type not to be forwarded, the reflecting node inputs the corresponding information and sends the corresponding information to the designated active node through the corresponding RIS module. The invention expands the application scene of the MRR optical communication system, leads the coverage area of the communication system to be wider, and solves the problem that the traditional relay node can only transmit other user information and can not transmit own information with the same frequency and the same code when transmitting the information.
Description
Technical Field
The invention mainly relates to the technical field of next-generation mobile communication, in particular to a modulated reflection wireless optical communication system and method enhanced by RIS.
Background
Wireless optical communication technology: the wireless optical communication technology is a technology for realizing communication by modulating transmission information on light, using solid-state photoelectric lighting equipment (light-emitting diode) as a transmitter, performing wireless propagation through free space, and receiving by using a light detector. In recent years, in the advent of the internet of things, countless physical devices are connected to the internet from all corners of the world, and network communication data volume is also in explosion type growth, so that in order to meet the increasing demand of wireless communication data capacity and serve the rapid development of the internet of things technology, a novel green communication mode is generated, namely a wireless optical communication technology, and the wireless optical communication technology has the characteristics of richer spectrum resources, better confidentiality, lower cost and the like compared with the traditional wireless communication technology, and has very wide application scenes.
Back-modulated reflector (MRR) technology: in recent years, the weight and the volume of communication equipment become one of the difficulties restricting the wide application of the optical communication technology, the traditional wireless optical communication system requires that an optical transmitter and an optical receiver are installed at both terminals for communication, and a complex tracking system is also installed between the two terminals for relative movement, which not only increases the volume and the weight of the communication equipment, but also increases the complexity of the system, but also can eliminate the tracking system of one terminal when the wireless optical communication system using the optical back-modulation reflector technology is used for communication, lighten the volume and the weight of one terminal, increase the application flexibility of the communication system, and have wide application prospect.
The prior art proposes a cat eye retro-modulating reflector, as shown in fig. 7, in which a passive optical retro-modulating reflector (MRR) is coupled to an electro-optical modulator, so that only one end of a link is required to direct light, collect light, and track the light, so that the link can perform remote free space optical communication. In use, a conventional free-space optical communication terminal, receiver, is positioned at one end of the link and the MRR at the other end of the link is illuminated with a continuous wave beam, and the MRR modulates the interrogating beam and passively retroreflects it back to the interrogator to complete the communication, i.e., the MRR cannot operate alone. The MRR end usually has a weight of only a few kilograms, power consumption of only a few watts, and the MRR end is usually small in size, so that the deployment weight and power consumption of the MRR end can be greatly reduced. The reply information reflected by the cat eye backward modulation reflector (MRR) has certain divergence and attenuation after being transmitted by free space wireless; when the MRR optical structure is fixed, the reflection angle is fixed, namely, the reflection can only be modulated backwards, the reflection direction can not be changed dynamically, and the reflection direction of the recovered information can be changed only by redesigning and changing the internal optical structure.
Disclosure of Invention
The invention aims to solve the technical problem of providing a modulation reflection wireless optical communication system and a modulation reflection wireless optical communication method aiming at the defects of the prior art.
The technical scheme for solving the technical problems is as follows: a modulated reflective wireless optical communication system employing RIS enhancement, comprising an MR modulated reflector, a reflective node, and a plurality of active nodes, the MR modulated reflector disposed at the reflective node; the MR modulation reflector comprises an RIS active reflection device, wherein the RIS active reflection device comprises a plurality of RIS modules which are deployed in different areas, and the active node corresponds to at least one RIS module;
the active node is used for sending the information of the active node to the reflecting node through the corresponding RIS module;
the reflection node is used for sending the active node information to the appointed active node through the corresponding RIS module respectively when the active node information is determined to belong to the type to be forwarded,
when the active node information is determined to belong to a non-forwarding type, corresponding information is input as reflection node information, the reflection node information is sent to a designated active node through a corresponding RIS module, and the designated active node is one or more other active nodes and the active node sending the active node information.
The other technical scheme for solving the technical problems is as follows: a method of modulated reflective wireless optical communication employing RIS enhancement, the system comprising an MR modulated reflector, a reflective node, and a plurality of active nodes, the MR modulated reflector disposed at the reflective node; the MR modulation reflector comprises an RIS active reflection device, wherein the RIS active reflection device comprises a plurality of RIS modules which are deployed in different areas, and the active node corresponds to at least one RIS module; the method comprises the following steps:
s1, the active node sends active node information to the reflecting node through a corresponding RIS module;
s2, when the reflection node determines that the active node information belongs to the type to be forwarded, the reflection node sends the active node information to the appointed active node through the corresponding RIS module respectively,
when the active node information is determined to belong to a non-forwarding type, the active node information is used as reflection node information, the reflection node information is sent to a designated active node through a corresponding RIS module, and the designated active node is one or more active nodes and the active node sending the active node information.
The beneficial effects of the invention are as follows: the RIS active reflection type device which is independent of each other is deployed in different areas to replace a passive plane reflector in the traditional optical MRR, so that the problem that the traditional optical MRR cannot flexibly change the reflection direction of a return signal under the condition that the internal optical structure of the device is not changed can be solved, the application scene of the MRR optical communication system is expanded, and the coverage range of the communication system is wider;
different active nodes correspond to different RIS modules, so that the reflective node can realize signal receiving and transmitting and can also realize forwarding of other user signals, a full duplex wireless optical communication system model is formed, and the problem that the traditional relay node can only forward other user information and cannot transmit own information in the same frequency and same code when forwarding the information is solved.
Drawings
FIG. 1 is a block diagram of a modulated reflective wireless optical communication system employing RI S enhancement according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an MR modulating reflector according to an embodiment of the present invention;
fig. 3 is a schematic signal flow diagram of a modulated reflective wireless optical communication system using RIs enhancement according to an embodiment of the present invention;
fig. 4 is a schematic diagram of a multi-active-node single-reflection-node full duplex wireless optical communication system model according to an embodiment of the present invention;
fig. 5 is a schematic diagram of a peer-to-peer wireless optical communication system model with a reflective node as a receiving node according to an embodiment of the present invention;
fig. 6 is a flowchart of a communication method for improving system robustness by using an RI S module according to an embodiment of the present invention;
fig. 7 is a schematic diagram of a cat-eye retro-modulating reflector MRR of the prior art.
In the drawings, the names of the components represented by the respective marks are as follows:
1. lens, 2, modulating device, 3, RIs active reflection type device.
Detailed Description
The principles and features of the present invention are described below with reference to the drawings, the examples are illustrated for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
As shown in fig. 1, a modulated reflective wireless optical communication system employing RIs enhancement includes an MR modulated reflector disposed at a reflective node and a plurality of active nodes; the MR modulation reflector comprises an RI S active reflection device 3, wherein the RI S active reflection device 3 comprises a plurality of RI S modules which are deployed in different areas, and the active node corresponds to at least one RI S module;
the active node is used for sending the information of the active node to the reflecting node through the corresponding RI S module;
the reflection node is used for sending the active node information to the appointed active node through the corresponding RIS module respectively when the active node information is determined to belong to the type to be forwarded,
when the active node information is determined to belong to a non-forwarding type, corresponding information is input as reflection node information, the reflection node information is sent to a designated active node through a corresponding RIS module, and the designated active node is one or more other active nodes and the active node sending the active node information.
It will be appreciated that the MR modulated reflectors are deployed at the reflective nodes because: in these scenarios, one end of the communication system, such as the ground station, has no strict requirements on the deployment size, weight and power consumption of the communication equipment, and is set as the active node; while the other end, such as a drone or satellite, has high demands on the size, weight and power consumption, complexity of the communication device, they are set as reflecting nodes that deploy RIS-enhanced modulating reflectors (i.e. MR modulating reflectors) to minimize the weight and complexity of the communication device, and the reflecting nodes cannot communicate alone.
It should be understood that, the active node corresponds to at least one RIS module, which means that a spare RIS module may also be disposed in the RIS active reflection device 3, and when a failure occurs in a main RIS module of a certain active node, the main RIS module may be replaced by the spare RIS module, so that the number of RIS modules disposed in the RIS active reflection device is greater than or equal to the number of active nodes.
In the above embodiment, the independent RIS active reflection devices are deployed in different areas to replace the passive plane mirror in the traditional optical MRR, so that the problem that the traditional optical MRR cannot flexibly change the reflection direction of the return signal without changing the internal optical structure of the device can be solved, the application scenario of the MRR optical communication system is expanded, and the coverage area of the communication system is wider;
different active nodes correspond to RIS modules in different areas, so that the reflective node can realize signal receiving and transmitting and can also realize forwarding of other user signals, a full duplex wireless optical communication system model is formed, and the problem that the traditional relay node can only forward other user information and cannot transmit own information in the same frequency and same code when forwarding the information is solved.
As shown in fig. 3, on the basis of the above embodiment, the MR modulation reflector comprises an RIs active reflection device 3, a lens 1 and a modulation device 2; the lens 1 is positioned at the front end of the modulation device 2, and the RI active reflection device 3 is positioned at the rear end of the modulation device 2; the active node comprises an active node transmitting module, an active node circulator, an optical antenna and an active node receiving module; the reflecting node comprises a reflecting node circulator and a reflecting node receiving module;
the active node transmitting module is used for processing the active node information to obtain an active node optical signal, and inputting the active node optical signal into the active node circulator;
the active node circulator is used for isolating and directionally transmitting the active node optical signals to the optical antenna;
the optical antenna for transmitting the active node optical signal into a lens of the MR modulated reflector;
the lens 1 is used for converging the active node optical signals to the modulation device;
the modulating device 2 is configured to modulate the active node optical signal, and transmit the modulated active node optical signal to an RI S module corresponding to the active node;
the RI S module is used for directionally reflecting the modulated active node optical signals to the reflecting node circulator;
the reflection node circulator is used for isolating and directionally transmitting the modulated active node optical signals to the reflection node receiving module;
and the reflection node receiving module is used for processing the modulated active node optical signals to obtain active node information.
It should be appreciated that the MR modulated reflector mentioned in this embodiment may be regarded as an RIs enhanced modulated reflector; the RIs active reflective device 3 can be regarded as a multi-zone reflective active RIs.
The principle of operation of an MR modulated reflector can be understood as: when a part of signals of a plurality of active nodes are used as input to reach the RI S enhanced modulation reflector of the reflection node, the signals are focused by the front lens and then reach the modulation device, the modulation device is positioned in front of the multi-area reflection type active RI S at the focal plane of the lens, the modulation device is used as an optical switch to modulate the reply signals through the electric signal control device, and the modulated reply signals are used as output to reach the receiving modules of the active nodes after being amplified and dynamically reflected by RI S modules of different areas, so that communication is completed.
As shown in fig. 3, the function of the circulator can be understood as: in each node there will be a circulator, taking the reflection node R as an example, in which node there is input information R (dashed line) through the circulator to RI S and output information (solid line) of the active node through RI S, the circulator to the receiving module. The circulator isolates the information of the two links, namely the input information (dotted line) only reaches the RI S area after reaching the circulator; the output information (solid line) only reaches the receiving module after reaching the circulator, and the two links are transmitted according to respective solid line broken lines after being isolated, so that the communication quality is not affected by interference.
The solid line only runs along the direction marked by the solid line, the broken line runs along the direction marked by the broken line, and after the solid line and the broken line reach the circulator simultaneously, the solid line and the broken line do not cross talk due to the isolation effect of the circulator, namely run to the propagation direction of the broken line in advance.
The reflective node acts the same as the circulator of the active node.
RI S active reflective device 3 is improved based on intelligent super Surface (RIs) technology. At present, intelligent super Surface (RIs) attracts extensive attention from academia and industry once it has emerged because of its ability to flexibly manipulate the electromagnetic properties of the channel environment. The intelligent super surface (RI S) is generally formed by arranging a large number of carefully designed electromagnetic units, the electromagnetic properties of the electromagnetic units can be dynamically controlled by applying control signals to adjustable elements on the electromagnetic units, so that the intelligent regulation and control of the space electromagnetic waves in an active mode is realized, an electromagnetic field with controllable amplitude, phase, polarization and frequency is formed, and the RI S is introduced, so that the wireless propagation environment is changed from passive adaptation to active control, and an intelligent wireless environment is constructed. In addition, as two-dimensional implementation of the metamaterial, the intelligent super surface (RI S) has the characteristics of low cost, low complexity and easy deployment, has the opportunity to solve the requirements and challenges facing the development of the future mobile communication network, and has great development prospect.
In the above embodiment, the planar reflector (plane mirror) in the original cat eye backward modulation reflector (MRR) structure is replaced by the multi-region reflective active RIS, that is, the RIS enhanced modulation reflector is composed of a front lens, a rear modulation device and the multi-region reflective active RIS, and compared with the communication system of the original cat eye backward modulation reflector, the system energy can be improved by integrating the reflective active RIS at the rear; the multi-area reflective active RIS is deployed in different areas, so that the reflection directions of a plurality of modulated signals, namely reply signals, can be dynamically controlled simultaneously; the flexibility and the robustness of the system are improved.
On the basis of the above embodiment, the reflection node receiving module is further configured to process the active node information to obtain an active node optical signal when it is determined that the active node information belongs to a type to be forwarded, and input the active node optical signal into the reflection node circulator;
the reflection node circulator is further used for isolating the optical signals of the active nodes and transmitting the optical signals to RIS modules corresponding to the designated active nodes respectively;
the RIS module is used for dynamically and directionally reflecting the optical signals of the active nodes to the optical antennas of the corresponding active nodes.
As shown in fig. 4, in the above embodiment, the reflecting node acts as a relay node, and may be regarded as a multi-active-node single-reflecting-node full duplex wireless optical communication system model in which the reflecting node acts as a relay node. In fig. 4, a solid arrow indicates a slot 1, and a broken arrow indicates a slot 2.
It should be understood that the working flow of the multi-active node single reflection node full duplex wireless optical communication system with the reflection node as the relay node is as follows:
firstly, an active node A, B starts a tracking and aiming device, the tracking and aiming device scans to obtain the specific azimuth of a reflecting node R, and a transmitting module of the active node A, B is aligned with a modulation recovery RIS module of the reflecting node R, so that the smoothness of communication links at two ends is ensured; then, the active node A, B encodes and modulates the data (input information a and b) to be transmitted, and transmits a beam with data through the circulator isolation by the respective optical antennas, the beam reaches the reflective node R through free space wireless transmission, a part of the signal reaching the reflective node R is transmitted in one direction through the circulator isolation and reaches the receiving module, the receiving module demodulates the data transmitted by the active node A, B and controls the reflective node to perform corresponding actions, meanwhile, another part of the signal is converged by the lens and reaches the modulating device, after the reply (input) information R of the upper reflective node is modulated, the reflected signal is amplified by the RI S modules in different areas and is directionally reflected to the active node A, B at the same time after passing through the circulator in the reflective node, and one-time communication is completed.
In the transmitting module, firstly, the information to be transmitted is encoded, modulated signals are generated through modulation, then the bandwidth of signal transmission is widened through a pre-equalization circuit, the attenuation of the high-frequency part of the transmitted signals is improved, finally, the modulated signals are loaded on an optical generator together through direct current bias, and finally, the optical generator generates a beam with data.
In the receiving module, firstly, the photoelectric conversion device converts the received optical signal into an electric signal, and the electric signal is amplified and the direct current component in the electric signal is filtered through the signal processing module to obtain a modulated signal, and then the modulated signal is demodulated and decoded to obtain related information.
On the basis of the embodiment, the reflection node further comprises a reflection node transmitting module;
the reflection node receiving module is further used for sending an input signal to the reflection node transmitting module when the active node information is determined to belong to a non-forwarding type;
the reflection node transmitting module is used for inputting corresponding information according to the input signal, processing the reflection node information as reflection node information to obtain a reflection node optical signal, and inputting the reflection node optical signal into the reflection node circulator;
the reflection node circulator is further used for isolating the reflection node optical signals and transmitting the reflection node optical signals to RI S modules corresponding to the appointed active nodes respectively;
the RI S module is also used for dynamically and directionally reflecting the optical signals of the reflecting nodes to the optical antennas of the corresponding active nodes.
As shown in fig. 5, in the above embodiment, the role of the reflection node as the receiving node may be regarded as a point-to-point wireless optical communication system model in which the reflection node is the receiving node, which is a special case of the model shown in fig. 4.
On the basis of the above embodiments, the MR modulated reflector further comprises an intensity detection means; the intensity detection component is electrically connected with the modulation device;
the intensity detection component is used for detecting the intensity of the active node optical signals converged on the modulation device, and if the detected intensity is smaller than a threshold value, an adjustment instruction is generated and sent to the adjustment device;
the adjusting device is used for acquiring the code of the RI S module to be adjusted from the adjusting instruction, adjusting the angle of the RI S module in the area corresponding to the code, and generating an aiming instruction when the adjustment is completed;
the tracking and aiming device is also used for scanning the azimuth of the reflecting node according to the aiming instruction, aligning the corresponding RI S module, and generating a resending information instruction when the alignment is completed, wherein the resending information instruction is used for enabling the active node transmitting module to resend the active node information to the reflecting node.
As shown in fig. 6, the flow of the communication method for improving system robustness by using the RIs module is as follows:
s101: the flow starts;
s102: the tracking sighting device of the active node scans the MR end (i.e., MR modulated reflector) of the alignment reflection node;
s103: the active node sends data (namely active node information) and processes the data into an active node optical signal;
s104: the active node optical signal passes through the lens;
s105: the active node optical signal passes through the modulation device;
s106: judging whether the received signal strength is weak (i.e., whether the detected strength is less than a threshold), if so, executing S107, if not, executing S108;
s107: generating a signal corresponding to the changed RI S reflection angle (the signal is sent to the adjusting device), generating a signal for rescanning and aligning by the active node (the signal is sent to the receiving module of the active node, and the receiving module sends the signal to the tracking and aiming device), and returning to S102;
s108: the RI S module transmits a reply signal to the active end receiving module in a partitioning way;
s109: whether the communication is completed, if yes, S1010 is executed, if not, S103 is returned;
s1010: the flow ends.
In order to ensure the communication quality of the system, the intensity change of the signal received by the reflecting node is selected as an evaluation index of the deviation degree of the system alignment, taking the case that the communication link between the active node A and the reflecting node is disturbed due to various factors to cause a certain deviation of the system alignment (other same reason), namely when the intensity of the signal transmitted by the active node A received by the reflecting node is weakened to reach the threshold value designed in advance by the system, the reflecting node pauses communication at the moment and transmits information of pausing communication to each active node, then the reflecting node starts to dynamically change the reflection angle of RI S in the corresponding area and transmits a test signal, the active node A transmits a reply signal after receiving the test signal until the intensity of the reply signal transmitted by the active node A received by the reflecting node exceeds the threshold value regulated in advance by the system, and the system resumes communication until the communication task is completed.
In the above embodiment, the intensity detection unit may detect the intensity of the optical signal of the active node focused on the modulation device to adjust the angle of each RI S module, and after adjustment, the tracking sighting device scans the azimuth of the reflecting node and aligns the corresponding RI S module, so that the smoothness of the communication links at both ends of the reflecting node and the active node can be ensured, thereby improving the robustness and flexibility of the communication system.
The embodiment of the invention provides a modulation reflection wireless optical communication method enhanced by RI, which is applied to a modulation reflection wireless optical communication system, wherein the system comprises an MR modulation reflector, a reflection node and a plurality of active nodes, and the MR modulation reflector is arranged at the reflection node; the MR modulation reflector comprises an RI S active reflection device, wherein the RI S active reflection device comprises a plurality of RI S modules which are deployed in different areas, and the active node corresponds to at least one RI S module; the method comprises the following steps:
s1, the active node sends active node information to the reflecting node through an RI S module of a corresponding area;
s2, when the reflection node determines that the active node information belongs to the type to be forwarded, the reflection node sends the active node information to the appointed active node through the corresponding RI S module respectively,
when the active node information is determined to belong to a non-forwarding type, corresponding information is input as reflection node information, the reflection node information is sent to a designated active node through a corresponding RI S module, and the designated active node is one or more other active nodes and the active node sending the active node information.
On the basis of the above, the active node further comprises a tracking and aiming device; the MR modulated reflector further comprises an intensity detection component and an adjustment device; the intensity detection component is electrically connected with the modulation device; the method also comprises the steps of:
the intensity detection component detects the intensity of the active node optical signals converged on the modulation device, and if the detected intensity is smaller than a threshold value, an adjustment instruction is generated;
the adjusting device acquires the code of the RI S module to be adjusted from the adjusting instruction, adjusts the angle of the RI S module in the area corresponding to the code, and generates an aiming instruction when the adjustment is completed;
the tracking and aiming device scans the azimuth of the reflecting node according to the aiming instruction, aims at the corresponding RI S module, and generates a resending information instruction when the aiming is finished, wherein the resending information instruction is used for enabling the active node transmitting module to resend the active node information to the reflecting node.
The invention has the advantages that:
1. a structure and design of an MR modulated reflector with active reflective smart super Surface (RIs) enhancement is presented. In the present invention, compared to the conventional light back-modulating reflector (light MRR), the light MR enhanced by the active reflection type intelligent super surface (RI S) is used, and the return signal is not necessarily returned in the original path, so that the light MRR is a special case of the light MR. Specifically, the independent active reflection RI S is deployed in different areas to replace the passive plane mirror in the traditional optical MRR, so that the problem that the traditional optical MRR cannot flexibly change the reflection direction of the return signal under the condition of not changing the internal optical structure of the device can be solved, the application scene of the MRR optical communication system is expanded, and the coverage range of the communication system is wider.
2. The RI S enhanced Modulation Reflector (MR) is based on to propose a multi-active node (active node: a node capable of realizing signal transmission and reception without modulation and reflection function) and a single-reflective node (reflective node: a node capable of realizing signal transmission and reception and forwarding of other user signals, namely modulating own signals and reflecting signals of other users) full duplex wireless optical communication system model, wherein the reflective node is used as a point-to-point wireless optical communication system model of a receiving node as a special example. The problem that the traditional relay node can only transmit other user information and cannot transmit own information with the same frequency and the same code when transmitting the information is solved by modulating the reply signal through MR; the problem that the traditional optical MRR can only reflect the reply signal back to the active node is solved by dynamically adjusting the reflection direction of the reply signal through the active reflection RI S.
3. Aiming at the problem that when the traditional MRR optical communication system is disturbed, communication is stopped until a tracking system is realigned, and the system robustness is low, when the received signal strength of a reflecting node is weakened to a threshold value preset by the system, the system is realigned by changing the reflecting direction of the corresponding RI S module to recover the signal, so that the system robustness and flexibility are improved.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.
Claims (6)
1. A modulated reflective wireless optical communication system employing RIS enhancement, comprising an MR modulated reflector, a reflective node, and a plurality of active nodes, the MR modulated reflector disposed at the reflective node; the MR modulation reflector comprises an RIS active reflection device, wherein the RIS active reflection device comprises a plurality of RIS modules which are deployed in different areas, and the active node corresponds to at least one RIS module;
the active node is used for sending the information of the active node to the reflecting node through the corresponding RIS module;
the reflection node is used for sending the active node information to the appointed active node through the corresponding RIS module respectively when the active node information is determined to belong to the type to be forwarded,
when the active node information is determined to belong to a non-forwarding type, inputting corresponding information as reflection node information, and sending the reflection node information to a designated active node through a corresponding RIS module, wherein the designated active node is one or more other active nodes and an active node for sending the active node information;
the MR modulated reflector further comprises a lens and a modulating device; the lens is positioned at the front end of the modulation device, and the RIS active reflection device is positioned at the rear end of the modulation device; the active node comprises an active node transmitting module, an active node circulator, an optical antenna and an active node receiving module; the reflecting node comprises a reflecting node circulator and a reflecting node receiving module;
the active node transmitting module is used for processing the active node information to obtain an active node optical signal, and inputting the active node optical signal into the active node circulator;
the active node circulator is used for isolating and directionally transmitting the active node optical signals to the optical antenna;
the optical antenna for transmitting the active node optical signal into a lens of the MR modulated reflector;
the lens is used for converging the optical signals of the active node to the modulation device;
the modulation device is used for modulating the optical signal of the active node and transmitting the modulated optical signal of the active node to the RIS module corresponding to the active node;
the RIS module is used for directionally reflecting the modulated active node optical signals to the reflecting node circulator;
the reflection node circulator is used for isolating and directionally transmitting the modulated active node optical signals to the reflection node receiving module;
and the reflection node receiving module is used for processing the modulated active node optical signals to obtain active node information.
2. The reflection-modulated wireless optical communication system using RIS enhancement according to claim 1, wherein the reflection node receiving module is further configured to process the active node information to obtain an active node optical signal when it is determined that the active node information is of a type to be forwarded, and input the active node optical signal into the reflection node circulator;
the reflection node circulator is further used for isolating the optical signals of the active nodes and respectively transmitting the optical signals to RIS modules corresponding to the designated active nodes in a directional manner;
the RIS module is used for directionally reflecting the optical signals of the active nodes to the optical antennas of the corresponding active nodes.
3. The modulated reflective wireless optical communication system using RIS enhancement of claim 1, wherein the reflective node further comprises a reflective node transmit module;
the reflection node receiving module is further used for transmitting an input signal to the reflection node transmitting module when the active node information is determined to belong to a non-forwarding type;
the reflection node transmitting module is used for inputting corresponding information according to the input signal, processing the reflection node information as reflection node information to obtain a reflection node optical signal, and inputting the reflection node optical signal into the reflection node circulator;
the reflection node circulator is further used for isolating the reflection node optical signals and respectively transmitting the reflection node optical signals to RIS modules corresponding to the designated active nodes in a directional manner;
the RIS module is further configured to directionally reflect the optical signal of the reflective node to the optical antenna of the corresponding active node.
4. The modulated reflective wireless optical communication system employing RIS enhancement according to claim 1, wherein the active node further comprises tracking sighting means; the MR modulated reflector further comprises an intensity detection component and an adjustment device; the intensity detection component is electrically connected with the modulation device;
the intensity detection component is used for detecting the intensity of the active node optical signals converged on the modulation device, and if the detected intensity is smaller than a threshold value, an adjustment instruction is generated and sent to the adjustment device;
the adjusting device is used for acquiring the code of the RIS module to be adjusted from the adjusting instruction, adjusting the angle of the RIS module in the area corresponding to the code, and generating an aiming instruction when the adjustment is completed;
the tracking and aiming device is also used for scanning the azimuth of the reflecting node according to the aiming instruction, aiming at the corresponding RIS module, and generating a resending information instruction when aiming is finished, wherein the resending information instruction is used for enabling the active node transmitting module to resend the active node information to the reflecting node.
5. A modulated reflective wireless optical communication method employing RIS enhancement, applied to the modulated reflective wireless optical communication system of any one of claims 1 to 4, the system comprising an MR modulated reflector, a reflective node and a plurality of active nodes, the MR modulated reflector being disposed at the reflective node; the MR modulation reflector comprises an RIS active reflection device, wherein the RIS active reflection device comprises a plurality of RIS modules which are deployed in different areas, and the active node corresponds to at least one RIS module; the MR modulated reflector further comprises a lens and a modulating device; the lens is positioned at the front end of the modulation device, and the RIS active reflection device is positioned at the rear end of the modulation device; the active node comprises an active node transmitting module, an active node circulator, an optical antenna and an active node receiving module; the reflecting node comprises a reflecting node circulator and a reflecting node receiving module; the method is characterized by comprising the following steps of:
s1, the active node sends active node information to the reflecting node through a corresponding RIS module;
s2, when the reflection node determines that the active node information belongs to the type to be forwarded, the reflection node sends the active node information to the appointed active node through the corresponding RIS module respectively,
when the active node information is determined to belong to a non-forwarding type, corresponding information is input as reflection node information, the reflection node information is sent to a designated active node through a corresponding RIS module, and the designated active node is one or more other active nodes and the active node sending the active node information, specifically:
the active node transmitting module processes the active node information to obtain an active node optical signal, and inputs the active node optical signal into the active node circulator;
the active node circulator isolates and directionally transmits the active node optical signals to the optical antenna;
the optical antenna transmitting the active node optical signal into a lens of the MR modulated reflector;
the lens converges the active node optical signals to the modulation device;
the modulation device modulates the optical signal of the active node and transmits the modulated optical signal of the active node to an RIS module corresponding to the active node;
the RIS module directionally reflects the modulated active node optical signals to the reflecting node circulator;
the reflection node circulator isolates and directionally transmits the modulated active node optical signals to the reflection node receiving module;
and the reflection node receiving module processes the modulated active node optical signals to obtain active node information.
6. The method of modulated reflective wireless optical communication employing RIS enhancement according to claim 5, the active node further comprising a tracking sighting device; the MR modulated reflector further comprises an intensity detection component and an adjustment device; the intensity detection component is electrically connected with the modulation device; the method also comprises the steps of:
the intensity detection component detects the intensity of the active node optical signals converged on the modulation device, and if the detected intensity is smaller than a threshold value, an adjustment instruction is generated;
the adjusting device acquires the code of the RIS module to be adjusted from the adjusting instruction, adjusts the angle of the RIS module in the area corresponding to the code, and generates an aiming instruction when the adjustment is completed;
the tracking and aiming device scans the azimuth of the reflecting node according to the aiming instruction, aims at the corresponding RIS module, and generates a resending information instruction when the alignment is finished, wherein the resending information instruction is used for enabling the active node transmitting module to resend the active node information to the reflecting node.
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