Signal transmission method and device, and storage medium

Abstract

The application discloses a signal transmission method and device and a storage medium, and relates to the technical field of communication. The method is applied to a radar device, and comprises the following steps: acquiring a data symbol to be transmitted; superimposing the data symbol on a first radar signal to obtain a modulated signal, the first radar signal being any radar signal in a plurality of radar signals generated by the radar device, and the modulated signal being a radar signal carrying the data symbol; performing linear frequency modulation on a second radar signal and the modulated signal respectively, the frequency-modulated second radar signal and the frequency-modulated modulated signal being orthogonal, the second radar signal being other radar signals in the plurality of radar signals except the first radar signal; and transmitting the frequency-modulated radar signals and the frequency-modulated modulated signal to a plurality of signal receiving devices. Thus, the fusion of the radar signal and the data signal is realized.

Description

Technical Field

[0001] This application relates to the field of communications, and more particularly to a signal transmission method, apparatus, and storage medium. Background Technology

[0002] With the continuous development of communication technology, 5G technology can bring a better experience to users because it can accommodate a large number of devices and users, and provide faster data rates and lower latency services.

[0003] However, due to the increasing number of devices and the growing demand for services, available communication spectrum resources are becoming increasingly scarce. To reduce spectrum resource utilization, joint radar and communication (JRC) technology can be used to combine radar and communication signals for transmission. However, how to achieve this combination of radar and communication signals remains a pressing technical problem to be solved. Summary of the Invention

[0004] This application provides a signal transmission method, apparatus, and storage medium for fusing radar signals and communication signals.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, a signal transmission method is provided, applied to a radar device. The method includes: acquiring a data symbol to be transmitted; superimposing the data symbol onto a first radar signal to obtain a modulated signal, wherein the first radar signal is any one of a plurality of radar signals generated by the radar device, and the modulated signal is a radar signal carrying the data symbol; performing linear frequency modulation on a second radar signal and the modulated signal respectively, wherein the frequency-modulated second radar signal and the frequency-modulated modulated signal are orthogonal, and the second radar signal is any radar signal other than the first radar signal among the plurality of radar signals; and transmitting the frequency-modulated radar signal and the frequency-modulated modulated signal to a plurality of signal receiving devices, wherein the plurality of signal receiving devices include a first signal receiving device and a second signal receiving device, wherein the first signal receiving device is used to receive the data symbol to be transmitted, and the second signal receiving device is used to receive the radar signal.

[0007] In one possible implementation, the radar device is equipped with a smart metasurface used to modulate the radar signal. The aforementioned "superimposing data symbols onto the first radar signal to obtain a modulated signal" specifically includes: adjusting the impedance coefficient of the smart metasurface to superimpose the data symbols onto the first radar signal to obtain the modulated signal; the impedance coefficient is related to the device parameters of the smart metasurface.

[0008] In one possible implementation, the method further includes: determining a power allocation factor for the plurality of radar signals, the power allocation factor being used to indicate the transmit power of the radar signals. Specifically, the aforementioned "transmitting frequency-modulated radar signals and frequency-modulated modulation signals to multiple signal receiving devices" includes: transmitting frequency-modulated second radar signals and frequency-modulated modulation signals to multiple signal receiving devices according to the power allocation factor.

[0009] In one possible implementation, the above-mentioned "determining the power allocation factor of the plurality of radar signals" specifically includes: determining the detection range of the radar device and the data transmission rate of the data symbols, wherein the data transmission rate is determined based on the signal-to-noise ratio of the radar device; and determining the power allocation factor based on the detection range of the radar device, the data transmission rate of the data symbols, and the signal coefficient of the signal receiving device receiving the radar signals, wherein the signal coefficient is used to characterize the importance of the radar signals to the signal receiving device.

[0010] In one possible implementation, the above-mentioned "determining the detection range of the radar device" specifically includes: determining a first detection range and a second detection range of the radar device, wherein the first detection range is related to the transmission power of the radar device and the configuration parameters of the radar device, and the second detection range is the lower limit of the CRAMER / Rao Boundary (CRB) of the radar device; and determining the minimum value between the first detection range and the second detection range as the detection range of the radar device.

[0011] In one possible implementation, the modulated signal is: in, Let j be a complex number and f represent the first radar signal. c Let represent the carrier frequency of the first radar signal, γ represent the frequency adjustment rate of the first radar signal, n be the index of the first radar signal among the plurality of radar signals, t ∈ [nT1, nT1+T2], T1 represent the pulse repetition interval of the first radar signal, T2 represent the pulse peak interval of the first radar signal, and T1 is greater than T2. The data symbols are modulated. It is determined based on the impedance coefficient of the smart metasurface.

[0012] Secondly, a signal transmission device is provided that can implement the signal transmission methods in the above-mentioned aspects or possible designs. For example, the signal transmission device may have the function of performing the above-mentioned signal transmission methods, which can be implemented by hardware executing corresponding software. The hardware or software includes one or more modules corresponding to the above-mentioned functions. For example, the signal transmission device includes an acquisition unit, a modulation unit, a frequency modulation unit, and a transmission unit.

[0013] The acquisition unit is used to acquire the data symbols to be transmitted.

[0014] The modulation unit is used to superimpose data symbols onto the first radar signal to obtain a modulated signal. The first radar signal is any one of multiple radar signals generated by the radar equipment, and the modulated signal is a radar signal carrying data symbols.

[0015] The frequency modulation unit is used to linearly modulate the second radar signal and the modulation signal respectively. The frequency-modulated second radar signal and the frequency-modulated modulation signal are orthogonal. The second radar signal is one of the radar signals other than the first radar signal among multiple radar signals.

[0016] The transmitting unit is used to transmit frequency-modulated radar signals and frequency-modulated modulation signals to multiple signal receiving devices. The multiple signal receiving devices include a first signal receiving device and a second signal receiving device. The first signal receiving device is used to receive data symbols to be transmitted, and the second signal receiving device is used to receive radar signals.

[0017] In one possible implementation, the radar device is equipped with a smart metasurface used to modulate the radar signal. The modulation unit is specifically used to: superimpose data symbols onto the first radar signal by adjusting the impedance coefficient of the smart metasurface to obtain a modulated signal; the impedance coefficient is related to the device parameters of the smart metasurface.

[0018] In one possible implementation, the apparatus includes a determining unit for determining power allocation factors for multiple radar signals, the power allocation factors indicating the transmit power of the radar signals. A transmitting unit is specifically configured to: transmit a frequency-modulated second radar signal and a frequency-modulated modulation signal to multiple signal receiving devices according to the power allocation factors.

[0019] In one possible implementation, the determining unit is specifically used to: determine the detection range of the radar equipment and the data transmission rate of the data symbols, wherein the data transmission rate is determined based on the signal-to-noise ratio of the radar equipment; and determine a power allocation factor based on the detection range of the radar equipment, the data transmission rate of the data symbols, and the signal coefficient of the signal receiving equipment receiving the radar signal, wherein the signal coefficient is used to characterize the importance of the radar signal to the signal receiving equipment.

[0020] In one possible implementation, the determining unit is specifically used to: determine a first detection range and a second detection range of the radar device, wherein the first detection range is related to the transmit power of the radar device and the configuration parameters of the radar device, and the second detection range is the lower limit of the Cramé-Rao boundary (CRB) of the radar device; and determine the minimum value between the first detection range and the second detection range as the detection range of the radar device.

[0021] In one possible implementation, the modulated signal is: in, Let j be a complex number and f represent the first radar signal. c Let represent the carrier frequency of the first radar signal, γ represent the frequency adjustment rate of the first radar signal, n be the index of the first radar signal among the plurality of radar signals, t ∈ [nT1, nT1+T2], T1 represent the pulse repetition interval of the first radar signal, T2 represent the pulse peak interval of the first radar signal, and T1 is greater than T2. The data symbols are modulated. It is determined based on the impedance coefficient of the smart metasurface.

[0022] The specific implementation of the signal transmission device can be found in the processing methods provided by the first aspect or any possible design of the first aspect, and will not be repeated here. Therefore, the provided signal transmission device can achieve the same beneficial effects as the first aspect or any possible design of the first aspect.

[0023] Thirdly, a signal transmission device is provided. This device can realize the functions performed in the above aspects or possible designs. These functions can be implemented in hardware. For example, in one possible design, the device may include a processor and a communication interface. The processor can be used to support the device in realizing the functions involved in the first aspect or any possible design of the first aspect.

[0024] In another possible design, the device may further include a memory for storing necessary computer execution instructions and data. When the device is in operation, the processor executes the computer execution instructions stored in the memory to cause the device to perform the first aspect or any of the possible signal transmission methods involved in the first aspect.

[0025] Fourthly, a computer-readable storage medium is provided, which may be a readable non-volatile storage medium storing computer instructions or programs that, when executed on a computer, enable the computer to perform the signal transmission methods described in the first aspect or any of the possible methods involved in the above aspects.

[0026] Fifthly, a computer program product containing instructions is provided, which, when run on a computer, enables the computer to perform the signal transmission method involved in the first aspect or any of the above aspects.

[0027] Sixthly, a chip system is provided, including a processor and a communication interface, which can be used to implement the functions performed by the first aspect or any possible determination device of the first aspect. In one possible design, the chip system further includes a memory for storing program instructions and / or data. The chip system may be composed of chips or may include chips and other discrete devices, without limitation.

[0028] The technical effects of any of the design methods in aspects two through six can be found in the technical effects of aspect one mentioned above, and will not be repeated here. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the structure of a radar system provided in an embodiment of this application;

[0030] Figure 2 A schematic diagram of a radar device structure provided in an embodiment of this application;

[0031] Figure 3 A schematic diagram of a pulse signal provided in an embodiment of this application;

[0032] Figure 4 This is a schematic diagram of the structure of a communication device provided in an embodiment of this application;

[0033] Figure 5 A schematic flowchart illustrating a signal transmission method provided in an embodiment of this application;

[0034] Figure 6 A schematic flowchart illustrating another signal transmission method provided in an embodiment of this application;

[0035] Figure 7 A schematic flowchart illustrating another signal transmission method provided in an embodiment of this application;

[0036] Figure 8 This is a schematic diagram of another communication device 80 provided in an embodiment of this application. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solutions of this disclosure, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings.

[0038] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of the embodiments of this application as detailed in the appended claims.

[0039] It should also be understood that the term "comprising" indicates the presence of the described feature, whole, step, operation, element and / or component, but does not exclude the presence or addition of one or more other features, wholes, steps, operations, elements and / or components.

[0040] To achieve seamless integration of radar and communication signals on existing radar or communication equipment, additional algorithms or hardware modifications are typically added. However, there is currently no feasible solution for adding algorithms, and adding hardware is too costly.

[0041] Therefore, this application provides a signal transmission method that modulates radar signals by embedding a low-cost smart metasurface into a radar device, so that the modulated radar signal includes data symbols (or, data information) to be transmitted. The smart metasurface is composed of passive components and can quickly modulate signals. Therefore, it ensures simplicity in encoding and decoding and reduces modification costs. Furthermore, the smart metasurface enables phase modulation algorithms, ensuring communication reliability.

[0042] The method provided in the embodiments of this application will be described below with reference to the accompanying drawings.

[0043] Figure 1 A schematic diagram of a radar communication system provided in an embodiment of this application is shown. The radar communication system may include radar equipment and signal receiving equipment.

[0044] Radar equipment, also known as radar communication integrated equipment or radar transmitter, is used to transmit radar signals. These signals can be frequency-modulated continuous-wave (FMCW) pulse signals.

[0045] For example, such as Figure 1As shown, radar equipment may also include a radar signal transmitter, a power amplifier, a transmitting antenna, and a smart metasurface. The radar signal transmitter, also known as an FMCW carrier transmitter, is used to generate radar signals. The power amplifier is used to adjust the transmission power of the radar signal. The transmitting antenna is used to transmit the radar signal.

[0046] In one example, such as Figure 2 As shown, this is a radar device provided in an embodiment of the present application. This radar device has radar functionality and communication functionality. Figure 2 As shown, the transmitting end of the radar equipment can be equipped with a smart metasurface.

[0047] Among them, smart metasurfaces can also be called programmable smart metasurfaces. Smart metasurfaces can be used to modulate radar signals, superimposing data symbols onto the radar signals to obtain modulated signals. For example, radar equipment can send multiple radar signals to a smart metasurface and, by adjusting the impedance coefficient of the smart metasurface, superimpose data symbols onto the radar signals. The impedance coefficient of the smart metasurface can be determined based on the device parameters of the smart metasurface's unit cell. For details, please refer to the description below.

[0048] It should be noted that, in the embodiments of this application, the smart metasurface may include a transmissive metasurface and a reflective metasurface. When the smart metasurface is a transmissive metasurface, the radar signal can be superimposed with data symbols after passing through the smart metasurface. When the smart metasurface is a reflective metasurface, the radar signal can be superimposed with data symbols after being reflected by the smart metasurface. In this embodiment, a reflective metasurface is used as an example for explanation.

[0049] In one example, such as Figure 3 As shown, a smart metasurface can comprise multiple unit cells (only 20 are shown in the figure). A single unit cell can be composed of multiple passive devices. For example, such as... Figure 3 As shown, these passive components may include varactor diodes, equivalent inductors, equivalent resistors, inductors, and capacitors. The connection method for these passive components can be referred to... Figure 3 As shown, no further details will be provided.

[0050] The size of the varactor diode C can be set as needed and is not limited. Equivalent resistance R T (θ), equivalent inductance L B (θ), Inductance L T (θ), capacitance C T The value of (θ) can be determined based on the geometric parameters of the smart metasurface's unit cell. These parameters can include the unit cell's dimensions (e.g., length and width) and the distance between unit cells. θ represents the angle between the radar signal and the smart metasurface.

[0051] The principle of superimposing data symbols onto radar signals will be explained below.

[0052] In one example, the radar device can periodically transmit multiple FMCW pulse signals with a duration of Tp. For example, the expression for these multiple FMCW pulse signals can be as follows:

[0053]

[0054] Where t∈[nT1, nT1+T2], s n (t) represents n FMCW pulse signals, where n is the number of FMCW pulse signals, T1 represents the pulse repetition interval of the FMCW pulse signals, and T2 represents the pulse peak interval of the FMCW pulse signals. T1 is greater than T2. ​​For example, as... Figure 3 As shown, Figure 3 The diagram shows n FMCW pulse signals and the pulse repetition interval (T1) and pulse peak interval (T2) for each FMCW pulse signal.

[0055] Where j is a complex number, f c γ represents the carrier frequency of the FMCW pulse signal, and γ represents the frequency adjustment rate of the FMCW pulse signal.

[0056] In one example, combining the above expression for the FMCW pulse signal, superimposing the data symbol onto the nth FMCW pulse signal can be achieved by modulating the nth pulse signal among multiple FMCW pulse signals, so that...

[0057] in, Data symbols can be encapsulated using either continuous phase modulation or differential quadrature phase shift keying (QPSK) modulation.

[0058] For example, The reflection coefficient of a unit cell can be determined. The reflection coefficient of a unit cell can be used to describe the proportion of electromagnetic waves reflected by impedance discontinuities in the transmission medium. The expression for the reflection coefficient of a unit cell can be:

[0059] Γ(θ,f,C)=(Z(θ,f,C)-Z0) / (Z(θ,f,C)+Z0).

[0060] in, Z0 is the impedance in free space.

[0061] From the reflection coefficient of the unit cell mentioned above, it can be seen that the expression for the unit cell is in complex form. Therefore... This can refer to the phase of a complex number. For example, the simplified reflection coefficient described above is Γ(θ, f, C) = Aj + B.

[0062] After being modulated by the smart metasurface, the radar equipment can superimpose data symbols onto the radar signal to obtain a modulated signal, and then send the modulated signal to the signal receiving equipment.

[0063] It should be noted that, in this embodiment, the radar device may also be configured with a baseband module, which can be directly connected to the smart metasurface device. Compared to the method using a radio frequency chain, the modulation based on the smart metasurface in this embodiment can be considered as a radio frequency chain-free modulation. Therefore, the radar device based on the smart metasurface reduces hardware cost and complexity.

[0064] Among them, the signal receiving device can be used to receive modulated signals. For example, such as Figure 1 As shown, the signal receiving device may include a receiving antenna, a combiner, a filter, an analog-to-digital converter, and a baseband signal processor.

[0065] The receiver antenna is used to receive modulated signals. The combiner is used to adjust the frequency of the received modulated signal (e.g., converting a high-frequency signal to an intermediate-frequency signal). The filter is used to filter the frequency-adjusted modulated signal, for example, to filter noise signals. The analog-to-digital converter (ADC) is used to convert the analog signal (i.e., the modulated signal) into a digital signal. The baseband signal processor is used to process the digital signal.

[0066] It should be noted that, in the embodiments of this application, the signal receiving device can be a UE, a mobile station (MS), or a mobile terminal (MT), etc. Specifically, the terminal device can be a mobile phone, a tablet computer, or a computer with wireless transceiver capabilities. It can also be a virtual reality (VR) device, an augmented reality (AR) device, a wireless terminal in industrial control, a wireless terminal in autonomous driving, a wireless terminal in telemedicine, a wireless terminal in a smart grid, a wireless terminal in a smart city, a smart home, an in-vehicle terminal, etc.

[0067] The signal receiving device can also be the radar equipment itself. For example, when a radar signal emitted by the radar equipment is reflected back, the radar equipment can also receive the reflected signal. That is, in this case, the signal emitted by the radar equipment is used for measurement.

[0068] The system architecture and business scenarios described in the embodiments of this application are for the purpose of more clearly illustrating the technical solutions of the embodiments of this application, and do not constitute a limitation on the technical solutions provided in the embodiments of this application. As those skilled in the art will know, with the evolution of network architecture and the emergence of new business scenarios, the technical solutions provided in the embodiments of this application are also applicable to similar technical problems.

[0069] In practical implementation, Figure 1 The radar equipment and signal receiving equipment of the system can be adopted Figure 4 The shown composition structure, or including Figure 4 The components shown. Figure 4 This is a schematic diagram illustrating the composition of a communication device 400 provided in an embodiment of this application. The communication device 400 can be a chip or a system-on-a-chip in a signal transmission device. For example... Figure 4 As shown, the communication device 400 includes a processor 401, a communication interface 402, and a communication line 403.

[0070] Furthermore, the signal transmission device 400 may also include a memory 404. The processor 401, memory 404, and communication interface 402 can be connected via a communication line 403.

[0071] The processor 401 can be a CPU, a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. The processor 401 can also be other devices with processing capabilities, such as circuits, devices, or software modules, without limitation.

[0072] Communication interface 402 is used to communicate with other devices or other communication networks. These other communication networks can be Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. Communication interface 402 can be a module, circuit, communication interface, or any device capable of enabling communication.

[0073] Communication line 403 is used to transmit information between the components included in communication device 400.

[0074] Memory 404 is used to store instructions. These instructions can be computer programs.

[0075] The memory 404 can be a read-only memory (ROM) or other type of static storage device that can store static information and / or instructions; it can also be a random access memory (RAM) or other type of dynamic storage device that can store information and / or instructions; it can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, digital universal optical discs, Blu-ray discs, etc.), magnetic disk storage media or other magnetic storage devices, etc., without limitation.

[0076] It should be noted that the memory 404 can exist independently of the processor 401 or can be integrated with the processor 401. The memory 404 can be used to store instructions, program code, or some data, etc. The memory 404 can be located inside or outside the signal transmission device 400, without limitation. The processor 401 is used to execute the instructions stored in the memory 404 to implement the field configuration method provided in the following embodiments of this application.

[0077] In one example, processor 401 may include one or more CPUs, for example, Figure 4 CPU0 and CPU1 in the CPU.

[0078] As an optional implementation, the communication device 400 includes multiple processors, for example, besides Figure 4 In addition to processor 401, it may also include processor 407.

[0079] As an optional implementation, the communication device 400 also includes an output device 405 and an input device 406. For example, the input device 406 is a device such as a keyboard, mouse, microphone, or joystick, and the output device 405 is a device such as a display screen or speaker.

[0080] It should be noted that the communication device 400 can be a chip system or a device with... Figure 2 Equipment with a similar structure. Furthermore... Figure 4 The composition shown does not constitute a basis for the interpretation of this invention. Figure 1 The limitations of each device in the process, except Figure 4 In addition to the components shown, Figure 1 The various devices may include more or fewer components than illustrated, or combine certain components, or have different component arrangements.

[0081] In this embodiment of the application, the chip system may be composed of chips or may include chips and other discrete devices.

[0082] Furthermore, the actions, terms, etc., involved in the various embodiments of this application can be referenced interchangeably without limitation. The message names or parameter names in the messages between the various devices in the embodiments of this application are merely examples, and other names may be used in specific implementations without limitation.

[0083] To facilitate a clear description of the technical solutions in the embodiments of this application, the terms "first" and "second" are used in the embodiments of this application to distinguish identical or similar items with essentially the same function and effect. Those skilled in the art will understand that the terms "first" and "second" do not limit the quantity or execution order, and the terms "first" and "second" are not necessarily different.

[0084] It should be noted that, in this application, the terms "exemplary" or "for example" are used to indicate that something is being described as an example, illustration, or illustration. Any embodiment or design described as "exemplary" or "for example" in this application should not be construed as being more preferred or advantageous than other embodiments or design solutions. Specifically, the use of terms such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0085] In this application, "at least one" means one or more, and "more than one" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can mean: A alone, A and B simultaneously, or B alone, where A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" or similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, or c can mean: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0086] The following is combined with Figure 1 The system shown describes the signal transmission method provided in the embodiments of this application. The actions, terminology, etc., involved in the various embodiments of this application can be referenced interchangeably without limitation. The message names or parameter names in the messages exchanged between devices in the embodiments of this application are merely examples; other names may be used in specific implementations without limitation. The actions involved in the various embodiments of this application are merely examples; other names may be used in specific implementations. For example, "included in" in the embodiments of this application can be replaced with "carried on" or "carried in," etc.

[0087] It should be noted that the executing entity of this application embodiment can be... Figure 1 The radar equipment mentioned can also refer to components within the radar equipment, such as chips or systems-on-a-chip. The following description uses a radar equipment as an example to illustrate the method provided in the embodiments of this application.

[0088] Figure 5 A signal transmission method provided in this application embodiment includes:

[0089] S501, Obtain the data symbol to be transmitted.

[0090] Data symbols can also be called data signals or analog signals. The data symbols to be transmitted can be the data that the signal needs to receive.

[0091] In one example, the radar device may, in response to a request from a signal receiving device, obtain data to be transmitted from a data source and convert that data into data symbols.

[0092] S502. The data symbols are superimposed on the first radar signal to obtain the modulated signal.

[0093] The first radar signal can be any one of multiple radar signals generated by the radar equipment. The modulated signal can be a radar signal carrying data symbols.

[0094] In one possible implementation, the radar signal can be modulated using a smart metasurface to obtain an adjusted signal.

[0095] In one example, the radar device can superimpose data symbols onto a first radar signal by adjusting the impedance system of a smart metasurface. For instance, the radar device can adjust the capacitance of a varactor diode so that the modulated first radar signal is...

[0096] In another example, the radar device can adjust the phase and amplitude of the radar signal by adjusting the bias voltage of the smart metasurface, thereby obtaining the aforementioned... The radar equipment can then superimpose data symbols onto the first radar signal.

[0097] It should be noted that, in this embodiment of the application, when the radar device needs to transmit multiple data symbols (different data symbols correspond to different signal receiving devices), the radar device can superimpose different data symbols onto different radar signals. That is, the number of radar signals generated by the radar device is greater than or equal to the number of data symbols to be transmitted. The radar device can superimpose one data symbol to be transmitted onto one or more radar signals.

[0098] S503 performs linear frequency modulation on the second radar signal and the modulation signal respectively.

[0099] The second radar signal can refer to any radar signal other than the first radar signal among multiple radar signals. The frequency-modulated second radar signal and the frequency-modulated modulation signal are orthogonal.

[0100] In one example, the radar device may also be equipped with multiple chirped filters, all having the same center frequency but opposite polarities. In this way, the radar device can input the second radar signal and the modulation signal into these multiple chirped filters respectively to obtain the frequency-modulated second radar signal and the frequency-modulated modulation signal.

[0101] It should be noted that, in the embodiments of this application, the chirped filter can be a passive chirped filter.

[0102] For example, such as Figure 6 As shown, the radar equipment can frequency modulate the second radar signal using a first chirped filter, and then frequency modulate the modulated signal using a second chirped filter. The first and second chirped filters have the same center frequency but opposite polarities.

[0103] Specifically, the first chirp filter increases the frequency of the second radar signal, while the second chirp filter decreases the frequency of the modulating signal. This ensures that the frequency region of the frequency-modulated second radar signal does not overlap with the frequency region of the frequency-modulated modulating signal. Since signals in non-overlapping frequency regions are orthogonal to each other, interference between the frequency-modulated second radar signal and the frequency-modulated modulating signal can be avoided.

[0104] S504: Send frequency-modulated radar signals and frequency-modulated modulation signals to multiple signal receiving devices.

[0105] The multiple signal receiving devices may include a first signal receiving device and a second signal receiving device. Different signal receiving devices require different signals. For example, the first signal receiving device may be used to receive data symbols to be transmitted, while the second signal receiving device may be used to receive radar signals. For instance, the first signal receiving device may be a communication receiver (such as a mobile device), while the second signal receiving device may be a device detected by radar equipment (which can be simply referred to as a detection device).

[0106] In one possible implementation, the radar device can mix the frequency-modulated radar signal and the frequency-modulated modulation signal, and send the mixed signal to the signal receiving device in the form of electromagnetic waves.

[0107] Correspondingly, after receiving the mixed signal, the signal receiving device can filter the mixed signal to obtain the desired signal.

[0108] In one scenario, a mixed signal propagating in the form of electromagnetic waves transmitted by a radar device is received by a mobile device and reflected by a detection device. The mobile device can filter the mixed signal using a filter to obtain data symbols. The radar signal reflected by the detection device is received by the radar device, passes through a gain antenna and a low-noise amplifier, and is then guided to a down-converter and input to a matched filter. The output of the matched filter is fed to an envelope detector, and then to a threshold detector for processing, thereby solving the problem of mutual interference between the radar function and the communication function of the radar device.

[0109] In one example, such as Figure 6 As shown, the communication receiver may include a first matched filter, a demodulator, and a combiner.

[0110] The first matched filter can filter out the second radar signal from the mixed signal, resulting in the frequency-modulated signal. A demodulator can modulate the signal. Demodulation is performed to obtain the data symbols to be transmitted. The combiner can then process these data symbols to obtain an analog signal.

[0111] In another example, such as Figure 6 As shown, the detection device may include a second matched filter, a threshold detector, and a signal processor.

[0112] The second matched filter can filter out the modulation signal in the mixed signal to obtain the frequency-modulated second radar signal (s). n (t)). The threshold detector can be used to detect whether the frequency of the second radar signal after frequency hopping meets the threshold. If it does not, the frequency of the second radar signal is adjusted so that the frequency of the second radar signal reaches the threshold. The signal processor can process the second radar signal to obtain information about the detection equipment.

[0113] based on Figure 5 In this embodiment of the technical solution, the radar device modulates the radar signal to obtain a radar signal carrying data symbols. Then, the radar device performs linear frequency modulation on both the radar signal and the radar signal carrying data symbols to ensure that the frequency-modulated signals do not interfere with each other. Thus, the radar device can transmit the frequency-modulated radar signal and the radar signal carrying data symbols to the signal receiving device.

[0114] In some embodiments, to balance the radar and communication functions of the radar device, the transmission power of the radar signal and the modulated signal can be modulated separately according to the signal receiving device's requirements for radar functionality. Specifically, for example... Figure 7 As shown, prior to S504, the method provided in this application embodiment may further include S701.

[0115] S701. Determine the power allocation factor for each radar signal.

[0116] The power allocation factor can be used to determine the transmit power of radar signals. For example, the power allocation factor can be the ratio between the transmit power of a radar signal and the total transmit power of the radar equipment. That is, the sum of the power allocation factors of multiple radar signals is less than or equal to 1.

[0117] In one possible implementation, the radar device can determine the power allocation factor of the signal received by the signal receiving device based on the radar device's detection range, the data transmission rate of the data symbols, and the signal system of the signal receiving device.

[0118] The detection range of the radar equipment can be determined based on a first detection range and a second detection range. For example, the detection range of the radar equipment can be the minimum of the first and second detection ranges. The first detection range is related to the radar equipment's transmission power and configuration parameters, while the second detection range is related to the lower limit of the radar equipment's Cramer-Rao bound (CBR).

[0119] For example, based on Friis's theory, the initial detection range of a radar device can be determined. The configuration parameters of a radar device can include its power allocation factor, transmit and receive antenna gains, signal wavelength, bandwidth allocation parameters, and pulse duration. Of course, other parameters can also be included, such as the radar cross-section of the detection device and the magnitude of the noise signal.

[0120] For example, radar equipment can use the lower limit of the CRB of the radar range estimator to obtain the second detection range.

[0121] The data transmission rate of a data symbol can be calculated using the Shannon formula. For example, the data transmission rate of a data symbol can be the ratio between the corresponding transmit power and the signal-to-noise ratio.

[0122] In one example, the number of signal receiving devices is K, where K is a positive integer. The radar equipment can be modeled using a nash bargaining solution (NBS) to obtain a power allocation factor determination model. This power allocation factor determination model can be used to determine the power allocation factor for each radar signal. For example, the power allocation factor model can be:

[0123]

[0124] D i >D th

[0125] stC i >C th

[0126]

[0127] Where, α i D represents the signal coefficient of the i-th signal receiving device. The signal coefficient can be determined by the degree of importance of the radar signal to the signal receiving device. i C represents the detection range of the radar equipment. i ρ represents the data transmission rate of the i-th radar device, where the i-th radar signal is the signal that the i-th signal receiving device needs to receive. i D represents the power allocation factor for the i-th radar signal. th C th This is a preset threshold.

[0128] The signal coefficient of the signal receiving equipment is directly proportional to the importance of the radar signal to the equipment. In other words, the more important the radar signal is to the receiving equipment, the higher the signal coefficient.

[0129] In one example, the signal system of the signal receiving device can be related to the device type. For instance, when the signal receiving device is a mobile device, the signal coefficient of the mobile device can be 0. As another example, when the signal receiving device is a detection device, the signal coefficient of the detection device can be 1. Yet another example, when the signal receiving device needs to receive both data symbols and radar signals, the signal coefficient of the device can be 0.5, 0.6, 0.7, etc., specifically set according to the requirements of the signal receiving device.

[0130] It should be noted that the above D = min{R} max1 ,R max2}, R max1 R represents the first detection range. max2 This indicates the second detection range. As described above, R... max1This is related to the power allocation factor. Simultaneously, the data transmission rate of data symbols is also determined based on the transmit power, which is also related to the power allocation factor. Therefore, radar equipment can adjust the power allocation factor of each radar signal to maximize P. Furthermore, when P is maximized, the adjusted power allocation factor is used as the power allocation factor for that signal.

[0131] The transmission of frequency-modulated radar signals and frequency-modulated modulation signals to multiple signal receiving devices in S504 above may specifically include:

[0132] S702. Based on the power allocation factor, transmit the frequency-modulated second radar signal and the frequency-modulated modulation signal to multiple signal receiving devices.

[0133] Specifically, after determining the power allocation factor for each radar signal, the radar equipment can calculate the transmit power of each radar signal based on the power allocation factor and the total transmit power of the radar equipment. The radar equipment can then use the transmit power of each radar signal to send radar signals to the signal receiving equipment.

[0134] based on Figure 7 The technical solution allows radar equipment to flexibly determine the transmission power of each radar signal based on the power allocation factor of each radar signal, thereby achieving flexible transmission of radar signals.

[0135] The various solutions in the above embodiments of this application can be combined without contradiction.

[0136] This application embodiment can divide the field query device into functional modules or functional units according to the above method example. For example, each function can be divided into a separate functional module or functional unit, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or in software functional modules or functional units. The module or unit division in this application embodiment is illustrative and only represents one logical functional division; other division methods may be used in actual implementation.

[0137] When dividing each function into modules according to its corresponding function. Figure 8 A schematic diagram of a communication device 80 is shown. The communication device 80 can be the aforementioned radar device or a chip applied to the radar device. The communication device 80 can be used to perform the functions of the signal transmission device involved in the above embodiments. Figure 8 The communication device 80 shown may include: an acquisition unit 801, a modulation unit 802, a frequency modulation unit 803, and a transmission unit 804.

[0138] Acquisition unit 801 is used to acquire the data symbols to be transmitted.

[0139] The modulation unit 802 is used to superimpose data symbols onto the first radar signal to obtain a modulated signal. The first radar signal is any one of multiple radar signals generated by the radar equipment, and the modulated signal is a radar signal carrying data symbols.

[0140] The frequency modulation unit 803 is used to linearly modulate the second radar signal and the modulation signal respectively. The frequency-modulated second radar signal and the frequency-modulated modulation signal are orthogonal. The second radar signal is one of the radar signals other than the first radar signal among multiple radar signals.

[0141] The transmitting unit 804 is used to transmit frequency-modulated radar signals and frequency-modulated modulation signals to multiple signal receiving devices. The multiple signal receiving devices include a first signal receiving device and a second signal receiving device. The first signal receiving device is used to receive data symbols to be transmitted, and the second signal receiving device is used to receive radar signals.

[0142] In one possible implementation, the radar device is equipped with a smart metasurface used to modulate the radar signal. The modulation unit 802 is specifically used to: superimpose data symbols onto the first radar signal by adjusting the impedance coefficient of the smart metasurface to obtain a modulated signal; the impedance coefficient is related to the device parameters of the smart metasurface.

[0143] One possible implementation is, such as Figure 8 As shown, the device includes a determining unit 805 for determining power allocation factors for multiple radar signals, the power allocation factors indicating the transmit power of the radar signals. A transmitting unit 804 is specifically used to: transmit a frequency-modulated second radar signal and a frequency-modulated modulation signal to multiple signal receiving devices according to the power allocation factors.

[0144] In one possible implementation, the determining unit 805 is specifically used to: determine the detection range of the radar device and the data transmission rate of the data symbols, wherein the data transmission rate is determined based on the signal-to-noise ratio of the radar device; and determine a power allocation factor based on the detection range of the radar device, the data transmission rate of the data symbols, and the signal coefficient of the signal receiving device receiving the radar signal, wherein the signal coefficient is used to characterize the importance of the radar signal to the signal receiving device.

[0145] In one possible implementation, the determining unit 805 is specifically used to: determine a first detection range and a second detection range of the radar device, wherein the first detection range is related to the transmission power of the radar device and the configuration parameters of the radar device, and the second detection range is the lower limit of the CRAMER / Rao Boundary (CRB) of the radar device; and determine the minimum value between the first detection range and the second detection range as the detection range of the radar device.

[0146] In one possible implementation, the modulated signal is: in, Let j be a complex number and f represent the first radar signal. c Let represent the carrier frequency of the first radar signal, γ represent the frequency adjustment rate of the first radar signal, n be the index of the first radar signal among the plurality of radar signals, t ∈ [nT1, nT1+T2], T1 represent the pulse repetition interval of the first radar signal, T2 represent the pulse peak interval of the first radar signal, and T1 is greater than T2. The data symbols are modulated. It is determined based on the impedance coefficient of the smart metasurface.

[0147] This application also provides a computer-readable storage medium. All or part of the processes in the above method embodiments can be implemented by a computer program instructing related hardware. This program can be stored in the computer-readable storage medium, and when executed, it can include the processes of the above method embodiments. The computer-readable storage medium can be an internal storage unit of the signal transmission device (including a data transmitter and / or a data receiver) of any of the foregoing embodiments, such as the hard disk or memory of the signal transmission device. The computer-readable storage medium can also be an external storage device of the terminal device, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the terminal device. Further, the computer-readable storage medium can include both the internal storage unit of the signal transmission device and an external storage device. The computer-readable storage medium is used to store the computer program and other programs and data required by the signal transmission device. The computer-readable storage medium can also be used to temporarily store data that has been output or will be output.

[0148] It should be noted that the terms "first" and "second," etc., in the specification, claims, and drawings of this application are used to distinguish different objects, not to describe a specific order. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or apparatuses.

[0149] Through the above description of the embodiments, those skilled in the art can clearly understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0150] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the mutual coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between devices or units may be electrical, mechanical, or other forms.

[0151] The units described as separate components may or may not be physically separate. A component shown as a unit can be one or more physical units; that is, it can be located in one place or distributed in multiple different locations. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0152] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0153] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solutions of the embodiments of this application, essentially, or the parts that contribute to the prior art, or all or part of the technical solutions, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0154] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A signal transmission method, characterized in that, The method, applied to radar equipment equipped with a smart metasurface for modulating radar signals, includes: Obtain the data symbols to be transmitted; By adjusting the impedance coefficient of the smart metasurface, the data symbols are superimposed on the first radar signal to obtain a modulated signal; wherein, the impedance coefficient is related to the device parameters of the smart metasurface; the first radar signal is any one of multiple radar signals generated by the radar device, and the modulated signal is a radar signal carrying the data symbols; The second radar signal and the modulation signal are linearly frequency modulated respectively. The frequency-modulated second radar signal and the frequency-modulated modulation signal are orthogonal. The second radar signal is one of the radar signals other than the first radar signal among the plurality of radar signals. The frequency-modulated radar signal and the frequency-modulated modulation signal are transmitted to multiple signal receiving devices, including a first signal receiving device and a second signal receiving device. The first signal receiving device is used to receive the data symbol to be transmitted, and the second signal receiving device is used to receive the radar signal.

2. The method according to claim 1, characterized in that, The method further includes: Determine the power allocation factor for the plurality of radar signals, the power allocation factor being used to indicate the transmit power of the radar signals; The step of sending the frequency-modulated radar signal and the frequency-modulated modulation signal to multiple signal receiving devices includes: According to the power allocation factor, the frequency-modulated second radar signal and the frequency-modulated modulation signal are sent to the plurality of signal receiving devices.

3. The method according to claim 2, characterized in that, Determining the power allocation factor corresponding to the plurality of radar signals includes: The detection range of the radar device and the data transmission rate of the data symbols are determined, wherein the data transmission rate is determined based on the signal-to-noise ratio of the radar device; The power allocation factor is determined based on the detection range of the radar device, the data transmission rate of the data symbols, and the signal coefficient of the signal receiving device that receives the radar signal. The signal coefficient is used to characterize the importance of the radar signal to the signal receiving device.

4. The method according to claim 3, characterized in that, Determining the detection range of the radar device includes: A first detection range and a second detection range of the radar device are determined. The first detection range is related to the transmission power of the radar device and the configuration parameters of the radar device. The second detection range is the lower limit of the Cramé-Rao boundary (CRB) of the radar device. The minimum value between the first detection distance and the second detection distance is determined as the detection range of the radar device.

5. The method according to claim 1, characterized in that, The modulation signal is: ; in, This indicates the first radar signal. It is a complex number. This indicates the carrier frequency of the first radar signal. This represents the frequency adjustment rate of the first radar signal, where n is the sequence number of the first radar signal among the plurality of radar signals. ∈[nT1, nT1+T2], where T1 represents the pulse repetition interval of the first radar signal, T2 represents the pulse peak interval of the first radar signal, and T1 is greater than T2. The data symbols are modulated. It is determined based on the impedance coefficient.

6. A signal transmission device, characterized in that, An apparatus for use in radar equipment, wherein the radar equipment is equipped with a smart metasurface for modulating radar signals, the apparatus comprising: The acquisition unit is used to acquire the data symbols to be transmitted. A modulation unit is used to superimpose the data symbols onto a first radar signal by adjusting the impedance coefficient of the smart metasurface to obtain a modulated signal; wherein the impedance coefficient is related to the device parameters of the smart metasurface; the first radar signal is any one of a plurality of radar signals generated by the radar device, and the modulated signal is a radar signal carrying the data symbols; The frequency modulation unit is used to linearly modulate the second radar signal and the modulation signal respectively. The frequency-modulated second radar signal and the frequency-modulated modulation signal are orthogonal. The second radar signal is a radar signal other than the first radar signal among the plurality of radar signals. The transmitting unit is used to transmit the frequency-modulated radar signal and the frequency-modulated modulation signal to multiple signal receiving devices. The multiple signal receiving devices include a first signal receiving device and a second signal receiving device. The first signal receiving device is used to receive the data symbol to be transmitted, and the second signal receiving device is used to receive the radar signal.

7. The apparatus according to claim 6, characterized in that, The device further includes a determining unit; The determining unit is further configured to determine the power allocation factor of the plurality of radar signals, wherein the power allocation factor is used to indicate the transmit power of the radar signals; The transmitting unit is specifically used to transmit the frequency-modulated second radar signal and the frequency-modulated modulation signal to the plurality of signal receiving devices according to the power allocation factor.

8. The apparatus according to claim 7, characterized in that, The determining unit is specifically used for: The detection range of the radar device and the data transmission rate of the data symbols are determined, wherein the data transmission rate is determined based on the signal-to-noise ratio of the radar device; The power allocation factor is determined based on the detection range of the radar device, the data transmission rate of the data symbols, and the signal coefficient of the signal receiving device that receives the radar signal. The signal coefficient is used to characterize the importance of the radar signal to the signal receiving device.

9. The apparatus according to claim 8, characterized in that, The determining unit is specifically used for: A first detection range and a second detection range of the radar device are determined. The first detection range is related to the transmission power of the radar device and the configuration parameters of the radar device. The second detection range is the lower limit of the Cramé-Rao boundary (CRB) of the radar device. The minimum value between the first detection distance and the second detection distance is determined as the detection range of the radar device.

10. The apparatus according to claim 6, characterized in that, The modulation signal is: ; in, This indicates the first radar signal. It is a complex number. This indicates the carrier frequency of the first radar signal. This represents the frequency adjustment rate of the first radar signal, where n is the sequence number of the first radar signal among the plurality of radar signals. ∈[nT1, nT1+T2], where T1 represents the pulse repetition interval of the first radar signal, T2 represents the pulse peak interval of the first radar signal, and T1 is greater than T2. The data symbols are modulated. It is determined based on the impedance coefficient.

11. A computer-readable storage medium, characterized in that, The readable storage medium stores instructions that, when executed, implement the method as described in any one of claims 1-5.

12. A communication device, characterized in that, include: The processor, memory, and communication interface; wherein the communication interface is used for communication between the communication device and the signal receiving device; The memory is used to store one or more programs, the one or more programs including computer-executable instructions, and when the communication device is running, the processor executes the computer-executable instructions stored in the memory to cause the communication device to perform the method according to any one of claims 1-5.

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