Intelligent metasurface wireless communication system based on radar assistance

Abstract

The utility model discloses an intelligent metasurface wireless communication system based on radar assistance. The intelligent metasurface wireless communication system comprises a radar, a controller, a voltage control module and an intelligent metasurface structure which are connected in sequence. The controller is used for receiving position information detected by the radar and converting the position information into a bias voltage coding sequence; the voltage control module is used for outputting bias voltage to the intelligent metasurface according to the bias voltage coding sequence; the intelligent metasurface comprises a plurality of metasurface units arranged in an array, each metasurface unit comprises a variable capacitance diode, and the variable capacitance diodes are driven by the bias voltage to realize dynamic beam tracking. The wireless communication system provided by the utility model not only can improve the capability and stability of wireless communication between the base station and the target and enlarge the wireless coverage range of the base station, but also can be used in various illumination conditions such as heavy fog, night and the like and various wireless communication scenes such as urban traffic scenes, indoor scenes and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of wireless communication, and in particular to a radar-assisted intelligent metasurface wireless communication system. Background Art

[0002] Reconfigurable Intelligent Surface (RIS) is an array of artificial microstructures that are digital, programmable, and intelligent, controlled by algorithms. Originating from digitally coded and field-programmable metamaterials and information metamaterials that fuse the electromagnetic physical world with the digital world, RIS has evolved into an intelligent information system capable of adaptively sensing, reasoning, and making decisions based on changes in itself or its surroundings. Over the past two years, as research on intelligent metasurfaces has gradually unfolded, academia and industry have discussed and explored their application scenarios, which can be broadly categorized into two types: direct information modulation applications based on intelligent metasurfaces and intelligent wireless environment applications based on intelligent metasurfaces. Using intelligent metasurfaces for wireless communication between vehicles holds enormous potential.

[0003] Existing intelligent metasurface wireless communication systems primarily consist of three hardware components: target detection sensors, metasurfaces, and transmitters. Visual detection is the primary method for target detection, and cameras are often used as sensors. While this solution works well in well-lit environments, such as indoors, it fails in low-light conditions, such as at night or in foggy weather. With the continuous expansion of wireless communication scenarios, leveraging metasurface technology to ensure and enhance wireless communication between objects under test and between objects under test and base stations in urban traffic environments has become a new technical challenge. Utility Model Content

[0004] In order to solve the problems of existing metasurface wireless communication technology solutions, such as the use scenarios of target detection sensors being limited by light intensity and the poor wireless communication effect when the line-of-sight link between the base station and the object to be measured is blocked, the utility model uses radar and metasurface to construct a wireless communication system that can operate in urban traffic scenarios. By constructing a new wireless communication link between the base station and the object to be measured, the wireless communication capability and base station signal coverage range in the entire urban traffic scenario are improved.

[0005] In order to achieve the above-mentioned object, the utility model provides a radar-assisted intelligent metasurface wireless communication system, comprising a radar, a controller, a voltage control module, and an intelligent metasurface structure;

[0006] The controller is used to receive information detected by the radar and convert the information into a bias voltage code sequence;

[0007] The voltage control module is used to output a bias voltage to the smart metasurface according to the bias voltage coding sequence;

[0008] The intelligent metasurface includes a plurality of metasurface units arranged in an array, each of the metasurface units includes a varactor diode, and the varactor diode is driven by the bias voltage to realize dynamic beam tracking.

[0009] Furthermore, the smart metasurface structure comprises, from bottom to top, an X-direction feeding layer, a Y-direction feeding layer, a metal stratum, a substrate and a metasurface array;

[0010] The surfaces of the X-direction feeding layer and the Y-direction feeding layer are further provided with an X-direction feeding line and a Y-direction feeding line respectively;

[0011] The metasurface unit includes a central metal patch, and a varactor diode, a peripheral metal patch, and an inductor that are sequentially arranged around the central metal patch and are electrically conductive;

[0012] The substrate is provided with a central metal via, an X-direction metal via, and a Y-direction metal via that match the metasurface unit; wherein the inductors in the X-direction and Y-direction are connected to the X-direction feed line and the Y-direction feed line respectively through the X-direction metal via and the Y-direction metal via; and the central metal patch is connected to the metal stratum through the central metal via.

[0013] Furthermore, four varactor diodes, peripheral metal patches and inductors are provided in the metasurface unit, and are respectively arranged at 90° around the central metal patch.

[0014] Furthermore, a structure on the substrate that matches a metasurface unit is provided with a central metal via, two X-direction metal vias, and two Y-direction metal vias;

[0015] The central metal via is provided at the center of the central metal patch;

[0016] The X-direction metal via and the Y-direction metal via are arranged at an interval of 90° relative to the center of the central metal patch.

[0017] Furthermore, the thickness of the substrate is 2-5 mm.

[0018] Furthermore, the thickness of the central metal patch and the peripheral metal patch is 0.02-0.05 mm.

[0019] Furthermore, the thickness of the X-direction feeding layer and the Y-direction feeding layer is 0.1-0.5 mm.

[0020] Furthermore, the substrate is made of F4B material.

[0021] Furthermore, the material of the X-direction feeding layer and the Y-direction feeding layer is FR4 material.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The wireless communication system of this utility model obtains the target's location information through radar and converts the location information into a bias voltage sequence for optimal beam pointing. Through this bias voltage sequence, the intelligent metasurface can accurately deflect the wireless signal from the base station toward the target, thereby establishing a new wireless communication link between the base station and the target, improving the ability and stability of wireless communication between the base station and the target, and expanding the wireless coverage range of the base station.

[0024] The wireless communication system of the present invention can work normally under various lighting conditions such as heavy fog and night time, and can be used in various wireless communication scenarios such as urban traffic scenarios and indoor scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0026] Figure 1 A schematic structural diagram of a radar-assisted intelligent metasurface wireless communication system according to Example 1 is shown;

[0027] Figure 2 shows a top view of a single metasurface unit;

[0028] Figure 3 shows a side view of the smart metasurface structure;

[0029] Figure 4 shows a top view of the smart metasurface structure;

[0030] Figure 5 The following is a flowchart showing the radar-assisted intelligent metasurface wireless communication system according to Example 2;

[0031] Description of reference numerals:

[0032] 1. Radar; 2. Controller; 3. Voltage control module; 4. Intelligent metasurface structure; 41. X-direction feed line 41; 42. X-direction feed layer; 43. Y-direction feed line; 44. Y-direction feed layer; 45. Metal layer; 46. Substrate; 461. Central metal via; 462. X-direction metal via; 463. Y-direction metal via; 47. Metasurface array; 48. Metasurface unit; 481. Central metal patch; 482. Varactor diode; 483. Peripheral metal patch; 484. Inductor. DETAILED DESCRIPTION

[0033] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections, electrical connections, or mutual communication; they can refer to direct connections or indirect connections through an intermediate medium; they can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0034] The following will be combined with the specific embodiments of the present invention and the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Example 1

[0036] like Figure 1 As shown, a radar-assisted intelligent metasurface wireless communication system includes a radar 1, a controller 2, a voltage control module 3, and an intelligent metasurface structure 4, which are connected in sequence. Radar 1 detects and tracks moving targets, obtains target location information, and transmits this location information to the connected controller 2. A pre-trained neural network model on controller 2 converts location information into a bias voltage coding sequence and transmits the bias voltage coding sequence to voltage control module 3. Based on the received bias voltage coding sequence, voltage control module 3 outputs a corresponding bias voltage to the intelligent metasurface through a voltage output channel. Intelligent metasurface structure 4 includes a plurality of metasurface units 48 arranged in an array, each of which includes a varactor diode 482. Varactor diode 482 is driven by the bias voltage to achieve dynamic beam tracking.

[0037] In this embodiment, radar 1 uses a millimeter-wave radar model TI AWR1843Boost, and transmits the position information obtained by the millimeter-wave radar to controller 2 through the serial port; controller 2 sends the bias voltage coding sequence to the voltage control module 3 connected to it through the TCP / IP protocol. The voltage control module 3 is connected to the intelligent metasurface structure 4 through the J63A connector, and the bias voltage is applied to each channel.

[0038] In this embodiment, the voltage control module 3 can realize the control of 128 voltage channels, with an output voltage range of 0V-20V, an output voltage accuracy of 0.05V, and a voltage refresh rate of 1.5ms.

[0039] Specifically, if Figure 2 As shown, the smart metasurface structure 4 includes an X-direction feed layer 42, a Y-direction feed layer 44, a metal layer 45, a substrate 46 and a metasurface array 47 from bottom to top; the surfaces of the X-direction feed layer 42 and the Y-direction feed layer 44 are also provided with an X-direction feed line 41 and a Y-direction feed line 43, respectively. Figure 3 and Figure 4 As shown, the metasurface array 47 consists of 16 rows and 16 columns, with a total of 256 metasurface units 48. Each repeated metasurface unit 48 includes a central metal patch 481, and a varactor diode 482, a peripheral metal patch 483, and an inductor 484 that are sequentially arranged around the central metal patch 481 and are electrically conductive. There are four varactor diodes 482, peripheral metal patches 483, and inductors 484 in the metasurface unit 48, which are respectively arranged at 90 degrees around the central metal patch 481; a central metal via 461, an X-direction metal via 462, and a Y-direction metal via 463 that match the metasurface unit 48 are provided on the substrate 46; wherein, the substrate The structure on plate 46, matching a metasurface unit 48, includes a central metal via 461, two X-direction metal vias 462, and two Y-direction metal vias 463. The central metal via 461 is located at the center of a central metal patch 481. The X-direction metal vias 462 and the Y-direction metal vias 463 are spaced 90 degrees apart relative to the center of the central metal patch 481. X-direction and Y-direction inductors 484 are connected to the X-direction feeder 41 and the Y-direction feeder 43, respectively, via the X-direction metal vias 462 and the Y-direction metal vias 463. The central metal patch 481 is connected to the metal ground layer 45 via the central metal vias 461. Each metasurface unit 48 can be independently controlled by the voltage control module 3 and can operate in either X- or Y-polarization states. The intelligent metasurface array 47 employs a dynamically programmable design, enabling adaptive dynamic electromagnetic beam tracking without human intervention.

[0040] In this embodiment, the X-direction feed layer 42 and the Y-direction feed layer 44 are made of FR4 material, both of which are 0.25 mm thick. The substrate 46 is made of F4B material with a thickness of 3 mm. The central metal patch 481 and the peripheral metal patch 483 are made of copper, both of which are 0.035 mm thick. The operating center frequency of the metasurface array 47 is 3.5 GHz. Under the control of the voltage control module 3, it can achieve an angular deflection of the electromagnetic beam of ±50°, with a gain of approximately 10 dB. The varactor diode 482 is SMV2020-079LF. The inductor 484 is MLK1005S82NJT000.

[0041] Example 2

[0042] This embodiment is basically the same as embodiment 1, except that the radar uses the existing millimeter-wave radar of the car, the controller is based on the on-board chip, and the on-board chip is equipped with a pre-trained neural network model.

[0043] like Figure 5 As shown in the figure, the working process of this embodiment is described in detail: the vehicle-mounted millimeter-wave radar first detects moving targets such as vehicles and outputs their position information such as azimuth and pitch angle relative to itself. Then, the position information is input into a pre-trained neural network to obtain a bias voltage coding sequence for precise beam pointing. This coding sequence is sent down by the voltage control module to the intelligent metasurface, ultimately realizing adaptive dynamic beam tracking.

[0044] The results show that the wireless communication system of this embodiment can operate in environments without human intervention, including urban traffic scenarios, indoor scenarios, and various scene conditions such as nighttime, heavy fog, and rainy days.

[0045] Overall, the wireless communication system of this embodiment can operate normally under various lighting conditions, such as heavy fog and at night, and can be used in a variety of wireless communication scenarios, including urban traffic scenes and indoor scenes. Furthermore, the pre-trained neural network model can generate a codebook with more accurate beam pointing, ensuring real-time performance while reducing the memory overhead associated with existing pre-stored codebook solutions. Furthermore, by sharing data from the vehicle's existing millimeter-wave radar and the computing power of the onboard chip, the cost of existing solutions can be reduced, making it easier for the wireless communication system to conform to the vehicle.

[0046] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A radar-assisted intelligent metasurface wireless communication system, characterized in that: It includes a radar, a controller, a voltage control module, and an intelligent metasurface structure connected in sequence; The controller is used to receive the position information detected by the radar and convert the position information into a bias voltage code sequence; The voltage control module is used to output a bias voltage to the smart metasurface according to the bias voltage coding sequence; The intelligent metasurface includes a plurality of metasurface units arranged in an array, each of the metasurface units includes a varactor diode, and the varactor diode is driven by the bias voltage to realize dynamic beam tracking.

2. The wireless communication system according to claim 1, wherein The smart metasurface structure comprises, from bottom to top, an X-direction feeding layer, a Y-direction feeding layer, a metal stratum, a substrate and a metasurface array; The surfaces of the X-direction feeding layer and the Y-direction feeding layer are further provided with an X-direction feeding line and a Y-direction feeding line respectively; The metasurface unit includes a central metal patch, and a varactor diode, a peripheral metal patch, and an inductor that are sequentially arranged around the central metal patch and are electrically conductive; The substrate is provided with a central metal via, an X-direction metal via, and a Y-direction metal via that match the metasurface unit; wherein the inductors in the X-direction and Y-direction are connected to the X-direction feed line and the Y-direction feed line respectively through the X-direction metal via and the Y-direction metal via; and the central metal patch is connected to the metal stratum through the central metal via.

3. The wireless communication system according to claim 2, wherein: The metasurface unit includes four varactor diodes, four peripheral metal patches, and four inductors, which are arranged at 90° around the central metal patch.

4. The wireless communication system according to claim 2, wherein: In the structure on the substrate that matches a metasurface unit, a central metal via, two X-direction metal vias, and two Y-direction metal vias are provided; The central metal via is provided at the center of the central metal patch; The X-direction metal via and the Y-direction metal via are arranged at an interval of 90° relative to the center of the central metal patch.

5. The wireless communication system according to claim 2, wherein: The thickness of the substrate is 2-5 mm.

6. The wireless communication system according to claim 2, wherein: The thickness of the central metal patch and the peripheral metal patch is 0.02-0.05 mm.

7. The wireless communication system according to claim 2, wherein: The thickness of the X-direction feeding layer and the Y-direction feeding layer is 0.1-0.5 mm.

8. The wireless communication system according to claim 2, wherein: The substrate is made of F4B material.

9. The wireless communication system according to claim 2, wherein: The X-direction feeding layer and the Y-direction feeding layer are made of FR4 material.

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