A method and apparatus for transmitting a signal for positioning

Abstract

A method and apparatus for transmitting a signal used for positioning. A first signal is generated, a first rising edge duration of the first signal being less than a first falling edge duration, the first rising edge duration being a duration of a rising edge of a main lobe waveform of the first signal, and the first falling edge duration being a duration of a falling edge of the main lobe waveform of the first signal; and the first signal is transmitted. The main lobe waveform of the signal generated by the embodiment of the application has a short rising time, and the shorter the rising time of the main lobe waveform is, the more conducive it is to distinguishing between two adjacent paths or more conducive to identifying the first-arrival path of the received signal. Therefore, if the first signal provided by the embodiment of the application is used for ranging, the receiving device can distinguish between multiple paths with smaller time delay intervals or more accurately determine the arrival time of the first-arrival path, thereby improving the ranging / positioning accuracy.

Description

[0001] Cross-references to related applications

[0002] This application claims priority to Chinese Patent Application No. 202111100880.6, filed on September 18, 2021, entitled "A Method for Ultra-Wideband Pulse Transmission", the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of communication technology, and in particular to a method and apparatus for transmitting signals for positioning. Background Technology

[0004] Pulse-radio ultra-wideband (IR-UWB) technology can achieve centimeter-level positioning accuracy with low power consumption by transmitting short pulses on the order of nanoseconds (ns). A common ranging method in UWB is for the receiving device to calculate the distance between the transmitting and receiving devices by measuring the first path of the received signal. This requires the receiving device to distinguish the multipath of the received signal to determine the first path. UWB's ability to resolve multipath is related to the width of the main lobe of the transmitted pulse; the narrower the main lobe, the better it is at distinguishing two adjacent paths.

[0005] Current UWB protocols do not specify concrete transmit pulses; they only constrain the cross-correlation between the actual transmit pulse and the root raised cosine (RRC) impulse response to meet certain conditions. Commonly used waveforms in existing technologies are main-lobe symmetrical waveforms in the time domain, such as RRC pulses or Gaussian pulses. In first-path ranging mechanisms based on received signals, the waveforms of existing transmit pulses are insufficient to distinguish multipath paths with small time delay intervals, thus limiting ranging accuracy. Summary of the Invention

[0006] This application provides a communication method and apparatus for improving ranging / positioning accuracy.

[0007] In a first aspect, a method for transmitting a signal for positioning is provided. This method can be executed by a transmitting device, a larger device including the transmitting device, or a chip system or other functional module capable of implementing the functions of the transmitting device. The chip system or functional module is, for example, disposed within the transmitting device. The transmitting device is, for example, a network device (e.g., an access network device or a core network device) or a terminal device. For example, the transmitting device is a device supporting UWB technology. The method includes: a first signal, wherein the duration of a first rising edge of the first signal is less than the duration of a first falling edge, the duration of the first rising edge is the duration of the rising edge of the main lobe waveform of the first signal, and the duration of the first falling edge is the duration of the falling edge of the main lobe waveform of the first signal; and transmitting the first signal.

[0008] In this embodiment, the duration of the first rising edge of the first signal is shorter than the duration of the first falling edge. In other words, the rise time of the main lobe waveform of the signal generated in this embodiment is shorter. A shorter rise time of the main lobe waveform is more conducive to distinguishing two adjacent paths, or to identifying the first path of arrival of the received signal. Therefore, using the first signal provided in this embodiment for ranging enables the receiving device to distinguish multipaths with small time delay intervals, or to more accurately determine the arrival time of the first path of arrival of the signal, thereby improving the accuracy of ranging and / or positioning.

[0009] In one optional implementation, the first rising edge is determined based on the rising edge of the main lobe waveform of the second signal, and the first falling edge is determined based on the falling edge of the main lobe waveform of the third signal, wherein the main lobe waveforms of the second signal and the third signal are different. Since the first waveform is asymmetrical in the time domain, one way for the transmitting device to generate the first signal is to generate both the second and third signals. The time-domain waveforms of the main lobe of the second signal (referred to as the second waveform) and the time-domain waveforms of the main lobe of the third signal (referred to as the third waveform) are both asymmetrical in the time domain. Thus, the first signal can be obtained from the second and third signals; for example, the first waveform can be obtained by concatenating the second and third waveforms. Generating the first signal in this way is relatively simple.

[0010] In one optional implementation, the main lobe waveform of the second signal differs from that of the third signal, including: the pulse duration of the main lobe waveform of the second signal differs from that of the main lobe waveform of the third signal. The main lobe waveforms of the two signals differ, for example, in terms of amplitude and / or duration. In this embodiment, the durations of the two main lobe waveforms can be different, thus allowing for the splicing of an asymmetric first waveform.

[0011] In one optional implementation, both the second signal and the third signal are Gaussian pulse signals; or, both the second signal and the third signal are RRC pulse signals; or, both the second signal and the third signal are triangular pulse signals; or, the second signal is a Gaussian pulse signal and the third signal is an RRC pulse signal; or, the second signal is an RRC pulse signal and the third signal is a Gaussian pulse signal; or, the second signal is a Gaussian pulse signal and the third signal is a triangular pulse signal; or, the second signal is a triangular pulse signal and the third signal is a Gaussian pulse signal; or, the second signal is a triangular pulse signal and the third signal is an RRC pulse signal; or, the second signal is an RRC pulse signal and the third signal is a triangular pulse signal. It can be seen that the second and third signals can be implemented in various ways, providing considerable flexibility. For example, if both the second and third signals are Gaussian pulse signals, the spectral efficiency of the obtained first signal is almost the same as that of existing Gaussian pulse signals. This means that the embodiments of this application can ensure spectral efficiency while improving ranging accuracy. Another example is that if the second signal is a Gaussian pulse signal and the third signal is an RRC pulse signal, the spectral efficiency of the obtained first signal is relatively higher than that of existing Gaussian pulse signals. This means that the embodiments of this application can improve both ranging accuracy and spectral efficiency. Yet another example is that if both the second and third signals are triangular pulse signals, it helps to better distinguish multipath signals.

[0012] In one optional implementation, the ratio between the duration of the first rising edge and the duration of the first falling edge is greater than a first threshold, which is determined based on power spectral density constraints. By ensuring that the ratio between the duration of the first rising edge and the duration of the first falling edge is greater than the first threshold, the first signal satisfies the power spectral density constraints, conforming to existing protocol specifications.

[0013] In one optional implementation, both the second signal and the third signal are Gaussian pulse signals, and the first threshold is... Alternatively, the second signal is a Gaussian pulse signal, the third signal is an RRC pulse signal, and the first threshold is... Alternatively, the second signal is a Gaussian pulse signal, the third signal is a triangular pulse signal, and the first threshold is... Alternatively, the second signal is a triangular pulse signal, the third signal is a Gaussian pulse signal, and the first threshold is... Alternatively, the second signal is a triangular pulse signal, the third signal is an RRC pulse signal, and the first threshold is... Alternatively, both the second signal and the third signal are triangular pulse signals, and the first threshold is... The first threshold may vary depending on the implementation of the second and / or third signals, and the specific first threshold can be determined based on the power spectral density constraint.

[0014] Secondly, a signal transmitting device for positioning is provided. The device can be the transmitting device described in the first aspect. The device possesses the functions of the aforementioned transmitting device. The device is, for example, a transmitting device, or a functional module within a transmitting device, such as a baseband device or a chip system.

[0015] In one optional implementation, the device includes a baseband device and a radio frequency device. The baseband device can perform functions such as signal generation, and the radio frequency device can perform functions such as signal transmission and / or reception.

[0016] In another optional implementation, the device includes a processing unit (sometimes also called a processing module) and a transceiver unit (sometimes also called a transceiver module). For example, the processing unit can implement the functions of a baseband device, and the transceiver unit can implement the functions of a radio frequency device. The transceiver unit can perform both transmitting and receiving functions. When the transceiver unit performs the transmitting function, it can be called a transmitting unit (sometimes also called a transmitting module), and when it performs the receiving function, it can be called a receiving unit (sometimes also called a receiving module). The transmitting unit and the receiving unit can be the same functional module, which is called the transceiver unit and can perform both transmitting and receiving functions; or, the transmitting unit and the receiving unit can be different functional modules, and the transceiver unit is a collective term for these functional modules.

[0017] In another optional implementation, the device further includes a storage unit, and the processing unit is configured to couple with the storage unit and execute programs or instructions in the storage unit to enable the device to perform the functions of the transmitting device described in the first aspect.

[0018] Thirdly, a computer-readable storage medium is provided for storing a computer program or instructions that, when executed, cause the method performed by the transmitting device in the first aspect to be implemented.

[0019] Fourthly, a computer program product containing instructions is provided, which, when run on a computer, enables the implementation of the method described in the first aspect. Attached Figure Description

[0020] Figure 1 A schematic diagram of a pulse sequence transmitted by a transmitting device;

[0021] Figure 2 A schematic diagram of the first path of a received signal;

[0022] Figure 3 A schematic diagram of the time-domain waveform of an RRC pulse;

[0023] Figure 4 A schematic diagram of the power spectral density of an RRC pulse;

[0024] Figure 5 A schematic diagram illustrating how existing transmitted waveforms struggle to distinguish multipath paths with small delay intervals.

[0025] Figure 6 This is a schematic diagram illustrating an application scenario according to an embodiment of this application;

[0026] Figure 7 A flowchart illustrating a method for transmitting a signal for positioning, provided in an embodiment of this application;

[0027] Figure 8 A schematic diagram of a first waveform provided in an embodiment of this application;

[0028] Figure 9 A schematic diagram of the power spectral density of a first signal provided in an embodiment of this application;

[0029] Figure 10 A schematic diagram of a received waveform of a first signal provided in an embodiment of this application;

[0030] Figure 11 A schematic diagram of a first waveform provided in an embodiment of this application;

[0031] Figure 12 A schematic diagram of the power spectral density of a first signal provided in an embodiment of this application;

[0032] Figure 13 A schematic diagram of a received waveform of a first signal provided in an embodiment of this application;

[0033] Figure 14 A schematic diagram of a first waveform provided in an embodiment of this application;

[0034] Figure 15 A schematic diagram of the power spectral density of a first signal provided in an embodiment of this application;

[0035] Figure 16 A schematic diagram of a received waveform of a first signal provided in an embodiment of this application;

[0036] Figure 17 A schematic diagram of a first waveform provided in an embodiment of this application;

[0037] Figure 18 A schematic diagram of the power spectral density of a first signal provided in an embodiment of this application;

[0038] Figure 19 A schematic diagram of a received waveform of a first signal provided in an embodiment of this application;

[0039] Figure 20 A schematic diagram of a first waveform provided in an embodiment of this application;

[0040] Figure 21 A schematic diagram of the power spectral density of a first signal provided in an embodiment of this application;

[0041] Figure 22 A schematic diagram of a received waveform of a first signal provided in an embodiment of this application;

[0042] Figure 23 A schematic diagram of a first waveform provided in an embodiment of this application;

[0043] Figure 24 A schematic diagram of the power spectral density of a first signal provided in an embodiment of this application;

[0044] Figure 25 A schematic diagram of a received waveform of a first signal provided in an embodiment of this application;

[0045] Figure 26 A schematic diagram of an apparatus provided in an embodiment of this application;

[0046] Figure 27 This is a schematic diagram of another device provided in an embodiment of this application. Detailed Implementation

[0047] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the embodiments of this application will be further described in detail below with reference to the accompanying drawings.

[0048] The following explanations of some terms or concepts used in the embodiments of this application are provided to facilitate understanding by those skilled in the art.

[0049] In this embodiment, the communication device is, for example, a terminal device, or a functional module (e.g., a chip system or communication chip) disposed within a terminal device, or a component or assembly having the functions of a terminal device, or a larger device including a terminal device. A terminal device is a device with wireless transceiver capabilities, and can be a fixed device, mobile device, handheld device (e.g., a mobile phone), wearable device, vehicle-mounted device, roadside unit (RSU), or a wireless device (e.g., a communication module, modem, or circuit system, etc.) built into the aforementioned devices. The terminal device is used to connect people, objects, and machines, and can be widely used in various scenarios, including but not limited to the following: cellular communication, device-to-device (D2D) communication, vehicle-to-everything (V2X) communication, machine-to-machine / machine-type communications (M2M / MTC) communication, Internet of Things (IoT), virtual reality (VR), augmented reality (AR), industrial control, self-driving, remote medical, smart grid, smart furniture, smart office, smart wearables, smart transportation, smart city, drones, robots, etc. The terminal device may sometimes be referred to as user equipment (UE), terminal, access station, UE station, remote station, wireless communication equipment, or user device, etc. For ease of description, this application embodiment uses a UE as an example to illustrate the communication device.

[0050] In this embodiment, the communication device can also be a network device, such as an access network device and / or a core network device. The access network device is a device with wireless transceiver capabilities, used to communicate with the terminal device. The access network device includes, but is not limited to, base transceiver stations (BTS), Node Bs, evolved Node Bs (eNodeB / eNB, or gNodeB / gNB), transmission reception points (TRPs), base stations evolved from the 3rd generation partnership project (3GPP), access nodes in wireless fidelity (WiFi) systems, wireless relay nodes, and wireless backhaul nodes. The base station can be a macro base station, a micro base station, a pico base station, a small cell, a relay station, etc. Multiple base stations can support networks using the same access technology mentioned above, or they can support networks using different access technologies mentioned above. A base station can contain one or more co-located or non-co-located transmission and reception points. Network devices can also be radio controllers, centralized units (CUs), and / or distributed units (DUs) in cloud radio access network (CRAN) scenarios. Network devices can also be servers, wearable devices, vehicle-mounted devices, RSUs, etc. The following description of access network devices uses a base station as an example. Multiple network devices in the communication system can be base stations of the same type or different types. Base stations can communicate with terminal devices or through relay stations. Terminal devices can communicate with multiple base stations in different access technologies. The core network devices are used to implement functions such as mobility management, data processing, session management, policy and billing. The names of devices implementing core network functions can differ in systems using different access technologies; this application does not limit this. Taking a 5G system as an example, the core network devices include: access and mobility management function (AMF), session management function (SMF), or user plane function (UPF), etc.

[0051] In this application embodiment, the communication device used to implement the network device function can be a network device itself, or it can be a device capable of supporting the network device in implementing that function, such as a chip system. This device can be installed within the network device. In the technical solutions provided in this application embodiment, the example of a network device being used to implement the network device function is used to describe the technical solutions provided in this application embodiment.

[0052] In this application embodiment, the number of nouns, unless otherwise specified, refers to "singular nouns or plural nouns," that is, "one or more." "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 exists alone, A and B exist simultaneously, or B exists alone, where A and B can be singular or plural. The character " / " generally indicates that the related objects before and after are in an "or" relationship. For example, A / B means: A or B. "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 means: a, b, c, a and b, a and c, b and c, or a and b and c, where a, b, and c can be single or multiple.

[0053] The ordinal numbers such as "first" and "second" mentioned in the embodiments of this application are used to distinguish multiple objects, and are not used to limit the size, content, order, timing, priority, or importance of the multiple objects. For example, the first signal and the second signal can be the same signal or different signals, and such names do not indicate that the resource location, content, priority, or importance of the two signals are different. In addition, the numbering of steps in the various embodiments described in this application is only to distinguish different steps, and is not used to limit the order between steps. For example, step S701 may occur before step S702, or may occur after S702, or may occur simultaneously with S702.

[0054] IR-UWB technology can achieve centimeter-level positioning accuracy with low power consumption by transmitting short pulses on the order of nanoseconds. According to UWB regulations, the power of a UWB device's transmitted signal may vary at different frequencies. At a frequency where the difference between the transmitted signal and the peak power is -10 dB, the signal bandwidth must be at least 500 MHz, and the upper limit of the equivalent isotropic radiated power spectral density (PSD) is -41 dBm / MHz. Given a fixed bandwidth at the aforementioned -10 dB level, higher spectral efficiency allows for higher permissible transmit power.

[0055] In an IR-UWB wireless communication system, the transmitting device can carry the information to be transmitted on pulses. For example, for a pulse p(t) of duration T, in a binary phase shift keying (BPSK) modulation scheme, if the information bit is 1, p(t) can be transmitted; if the information bit is 0, -p(t) can be transmitted. The receiving device can determine the information bit by detecting whether the amplitude of the received waveform is 1 or -1. Assuming the transmitting device needs to transmit an information bit stream of 11010, the transmitted pulse sequence would be as follows: Figure 1 As shown.

[0056] Besides information transmission, IR-UWB wireless systems can also perform positioning, that is, measure the distance between transceiver devices. A common ranging method involves the receiving device calculating the distance between the transceiver devices by measuring the path length of the received signal. For example... Figure 2 As shown in the figure, the upper part is a pulse in the pulse sequence transmitted by the transmitting device, and the lower part is the received waveform after the pulse has passed through multiple paths. If the time difference between the time the transmitting device transmits the pulse and the first path of the received waveform is τ, then the distance between the transmitting and receiving devices is d = τ × c, where c represents the speed of light. UWB's ability to resolve multipath is related to the width of the main lobe of the transmitted pulse in the time domain; the narrower the main lobe, the better it is to distinguish two adjacent paths based on the received waveform.

[0057] In the current UWB protocol, assuming the channel bandwidth is W (where W represents the available frequency width obtained by dividing the physical channel, and is independent of the specific waveform), it is required that at a frequency point where the difference between the peak PSD and the peak PSD is -10dB, the PSD bandwidth of the transmitted signal does not exceed W. -10 =1.3×W, at a frequency point where the difference between the peak PSD and the peak PSD is -18dB, the PSD bandwidth of the transmitted signal does not exceed W. -18 =1.6×W, which is also considered a PSD constraint. Currently, the UWB protocol does not specify the exact waveform of the transmitted pulse, but only constrains the cross-correlation between the actual transmitted pulse p(t) and the RRC impulse response r(t) to meet certain conditions. For example, when the channel bandwidth is 500MHz, the 3dB width of the time-domain waveform envelope of the transmitted pulse satisfying the PSD constraint is approximately 2ns (i.e., the time-domain span of the pulse envelope when the amplitude is greater than or equal to 1 / 2 of the peak amplitude is approximately 2ns). The protocol requires that the main lobe amplitude of the cross-correlation function between p(t) and r(t) with an amplitude greater than 0.8 has a time-domain width of not less than 0.5ns, and the sidelobe amplitude of the cross-correlation function between p(t) and r(t) does not exceed 0.3. When the channel bandwidth is W, the time-domain expression of the RRC pulse satisfying the PSD constraint is as follows:

[0058]

[0059] Where α = 0.5, m represents the amplitude contraction factor, and t represents time. In this embodiment, the unit of time is nanoseconds (ns). The amplitude contraction factor is a factor related to the transmission power. Different transmission powers correspond to different peak amplitudes, which in turn correspond to different amplitude contraction factors (or, different values ​​of the amplitude contraction factor). In various embodiments of this application, "*" can be understood as a multiplication operation; for example, "*" can also be replaced by "×". The time-domain waveform of the RRC pulse is as follows: Figure 3 As shown by the solid line in the image, Figure 3 The vertical axis represents the normalized amplitude. The PSD of the RRC pulse is as follows: Figure 4 As shown by the solid line in the image, Figure 4 The vertical axis represents PSD, with units of dBm / MHz. Figure 4 In the figure, the long dashed line represents the PSD constraint at W = 500MHz. As can be seen from the figure, the RRC pulse waveform is within the PSD constraint, thus satisfying the PSD constraint condition. Assuming the power of the RRC pulse waveform within the -10dB bandwidth is P, the spectral efficiency of the RRC pulse can be defined as:

[0060] P / (-41dBm / MHz*W -10 ) (Formula 2)

[0061] P is the power in the frequency range where the difference between the peak PSD and the peak PSD is greater than or equal to -10 dB. Wherein, PSD(f) is a function of the PSD of the pulse waveform as a function of frequency.

[0062] Under the condition of satisfying the PSD constraint, the higher the spectral efficiency of the transmitted pulse, the higher the allowable transmit power can be, that is, the larger P is, the more beneficial it is to improve coverage. The spectral efficiency of RRC pulses is relatively high, about 72%.

[0063] The hardware implementation of RRC pulses is generally quite complex; in practical systems, Gaussian pulses are commonly used for transmission. The time-domain expression of a Gaussian pulse is:

[0064]

[0065] in, BW -XdB This represents the -XdB bandwidth of the PSD function, that is, the frequency domain width of the PSD function where the difference between the peak value and the peak value is less than or equal to -XdB. m is the amplitude contraction factor, and t is time. The time-domain waveform of a Gaussian pulse is as follows: Figure 3 As shown by the dashed line in the figure, the PSD of the Gaussian pulse is as follows: Figure 4As shown by the short dashed line, the spectral efficiency of a Gaussian pulse is approximately 52%. The time-domain waveform of a Gaussian pulse has no sidelobes, and its spectral sidelobes are also relatively low, which helps reduce interference.

[0066] Current UWB devices primarily employ waveforms with a symmetrical main lobe in the time domain. For example, RRC pulses or Gaussian pulses are examples of symmetrical main lobe waveforms, meaning the rise and fall times of the main lobe are the same. For a specific symmetrical waveform, the signal bandwidth determines the pulse width, which in turn determines the rise time of the main lobe, thus strictly determining the multipath resolution capability. In first-path ranging mechanisms based on the received signal, existing waveforms struggle to distinguish multipath paths with small time delay intervals, limiting ranging accuracy. For example... Figure 5 As shown, assume there are two paths with a time difference of 2 ns, and the first path is 3 dB weaker in energy than the second path. Figure 5 The solid lines in the graph represent the received waveform of the RRC pulse, the dashed lines represent the received waveform of the Gaussian pulse, and the vertical axis represents the amplitude. As can be seen from the graph, the RRC pulse cannot distinguish between two multipath signals, although... Figure 5 The received waveform of the Gaussian pulse in the figure can roughly distinguish the two paths, but the amplitude of the peak of the first path is almost the same as the amplitude of the trough of the second path. Moreover, the waveform in the figure is continuous, while the waveform obtained by the receiving device in actual application may be discrete. Therefore, it is difficult for the receiving device to distinguish the two paths in practical application.

[0067] The inventors of this application have discovered through research that the shorter the duration of the rising edge of the main lobe waveform, the easier it is to distinguish between two adjacent paths. Therefore, this application provides a technical solution based on its embodiments. In this embodiment, the duration of the first rising edge of the first signal is shorter than the duration of the first falling edge. That is, the duration of the rising edge of the main lobe waveform of the signal generated in this embodiment is shorter. The duration of the rising edge of the main lobe waveform is its rise time. A shorter rise time of the main lobe waveform is more conducive to distinguishing between two adjacent paths, or more conducive to identifying the first path of arrival of the received signal. Therefore, if the first signal provided in this embodiment is used for ranging, the receiving device can distinguish multipaths with small delay intervals, or more accurately determine the arrival time of the first path of arrival of the signal, thereby improving ranging / positioning accuracy.

[0068] Please see Figure 6 This is one application scenario of an embodiment of this application. Figure 3The system includes a transmitting device and a receiving device, for example, both of which are UWB devices. The transmitting device can send signals to the receiving device, enabling the receiving device to perform functions such as ranging; alternatively, the receiving device receives a signal from the transmitting device and then sends a signal back to the transmitting device, which then performs functions such as ranging. This application does not limit the specific ranging method. For example, the transmitting device may be a network device and the receiving device may be a terminal device; or, the transmitting device may be a terminal device and the receiving device may be a network device; or, both the transmitting and receiving devices may be network devices; or, both the transmitting and receiving devices may be terminal devices.

[0069] The technical solutions provided by the embodiments of this application are described below with reference to the accompanying drawings.

[0070] This application provides a method for transmitting signals for positioning. Please refer to [link to relevant documentation]. Figure 7 Here is a flowchart of the method. In the following description, this method will be applied to... Figure 6 The network architecture shown is an example. The transmitting device described below is, for example, a... Figure 6 The transmitting device in the network architecture shown below, and the receiving device described below, are, for example, […]. Figure 6 The receiving device in the network architecture shown.

[0071] S701, The transmitting device generates the first signal.

[0072] For example, a transmitting device generates multiple pulses based on the information to be transmitted, where the first signal is, for example, any one of these pulses. The transmitting device modulates these multiple pulses to obtain a pulse sequence (e.g., ...). Figure 1 The image shows one possible pulse sequence. The transmitting device can send this pulse sequence, and the first signal is then transmitted.

[0073] The duration of a pulse (also called pulse duration) is, for example, the duration of the symbols occupied by the pulse. The shorter the duration, the easier it is for the receiving device to distinguish multipath components based on the waveform of the received signal of the pulse, and the higher the ranging accuracy. Therefore, in this embodiment, the duration of the first rising edge of the first signal can be less than the duration of the first falling edge. The duration of the first rising edge refers to the duration of the rising edge of the first waveform, and the duration of the first falling edge refers to the duration of the falling edge of the first waveform. The first waveform is the main lobe waveform of the first signal, for example, the time-domain waveform of the main lobe of the first signal. It can be seen that the first waveform is an asymmetric waveform in the time domain. The use of an asymmetric waveform in this embodiment can reduce the duration of the rising edge, thereby enabling the receiving device to better distinguish multipath components. In one embodiment, the rise time of the main lobe waveform is defined as the time taken for the rising edge of the main lobe waveform to rise from a low amplitude to a high amplitude. The low amplitude can be 10% of the peak amplitude, or any amplitude less than or equal to 20% of the peak amplitude. The high amplitude can be 90% of the peak amplitude, or any amplitude greater than or equal to 80% of the peak amplitude. For example, the duration of the first rising edge refers to the duration of the rising edge of the first waveform from 10% to 90% of the peak amplitude of the first signal. The falling time of the main lobe waveform is defined as the time from 90% to 10% of the peak amplitude of the main lobe waveform. For example, the duration of the first falling edge refers to the duration of the falling edge of the first waveform from 90% to 10% of the peak amplitude of the first signal.

[0074] Optionally, the duration of the first rising edge can be less than the second threshold. The second threshold, for example, is the duration of the rising edge of a symmetrical Gaussian pulse waveform under the same PSD constraint as in the embodiments of this application. For example, the PSD constraint when the channel bandwidth is W is that at a frequency point where the difference between the transmitted signal and the peak PSD is -10 dB, the PSD bandwidth W of the transmitted signal is... -10 For frequencies less than or equal to 1.3 × W = 650 MHz, at a frequency point where the difference between the peak PSD and the peak PSD is -18 dB, the transmitted signal's PSD bandwidth W -18 The frequency is less than or equal to 1.6 × W = 800 MHz. Under this PSD constraint, the rising edge duration of the symmetrical Gaussian pulse waveform is 1.38 ns, so the second threshold can be set to 1.38 ns. That is to say, the first rising edge duration in this embodiment is less than the rising edge duration of the existing symmetrical Gaussian pulse waveform, thereby improving the ranging accuracy.

[0075] However, the shorter the pulse duration, the larger the signal bandwidth, meaning more frequency domain resources are needed. Therefore, in this embodiment, the difference between the sum of the duration of the first rising edge and the duration of the first falling edge and the third threshold is less than or equal to the fourth threshold. The third threshold is twice the second threshold. For example, if the second threshold is the duration of the rising edge of a symmetrical Gaussian pulse waveform under the same PSD constraint as in this embodiment, then the third threshold is the duration of the symmetrical Gaussian pulse waveform under the same PSD constraint as in this embodiment (i.e., the sum of the duration of the rising edge and the duration of the falling edge). The fourth threshold is greater than or equal to 0. In other words, the difference between the duration of the first waveform (or the pulse duration of the first signal, i.e., the sum of the duration of the first rising edge and the duration of the first falling edge) and the duration of the existing transmitted pulse waveform is small. In fact, if the fourth threshold is 0, the duration of the first waveform is equal to the duration of the existing transmitted pulse waveform. This ensures that the duration of the first waveform remains constant relative to the existing transmitted pulse waveform, thereby reducing the occupation of frequency domain resources and saving resources. It should be noted that the actual signal waveform may have a flat region between the rising and falling edges. That is, after the rising edge, the signal enters a flat region where the amplitude is at its peak. The falling edge then enters after the flat region ends. Therefore, the pulse duration of the signal should actually include the duration of the flat region. However, the presence of a flat region is not conducive to improving ranging accuracy. Therefore, in this embodiment, the flat region of the first waveform can be ignored; or, in this embodiment, the flat regions of the second and / or third waveforms can be excluded when splicing the first signal; or, in this embodiment, the flat regions of the second and / or third waveforms can be included when splicing the first signal. That is, the first waveform also has a flat region, but the duration of the first waveform described in this embodiment may not include the duration of the flat region of the first waveform.

[0076] The duration of the first rising edge is reduced compared to the existing rising edge duration, while ensuring that the duration of the first waveform is substantially the same as the duration of the existing transmitted pulse waveform, one possible approach is to increase the duration of the falling edge of the first waveform (e.g., making the duration of the first falling edge greater than a second threshold), thereby ensuring that the duration of the first waveform remains substantially unchanged compared to the duration of the existing transmitted pulse waveform. It is evident that the first waveform in this embodiment is asymmetric in the time domain, meaning that the duration of the first rising edge is not equal to the duration of the first falling edge.

[0077] By adopting the technical solution of this application embodiment, the duration of the rising edge of the transmitted pulse waveform can be reduced without increasing frequency domain resources. This makes the delay between the first path and the adjacent path of the signal smaller, and the receiving device can also distinguish the first path and the adjacent path based on the received waveform, thereby improving the ranging accuracy.

[0078] As mentioned earlier, the first waveform is asymmetrical in the time domain. Therefore, one way for the transmitting device to generate the first signal is to generate a second and a third signal. The time-domain waveforms of the main lobe of the second signal (called the second waveform) and the time-domain waveforms of the main lobe of the third signal (called the third waveform) are both symmetrical in the time domain. Thus, the first signal can be obtained from the second and third signals. For example, a portion of the second waveform and a portion of the third waveform can be spliced ​​together to obtain the first waveform. An optional splicing method is that the rising edge of the first waveform is determined based on the rising edge of the second waveform, and the falling edge of the first waveform is determined based on the falling edge of the second waveform. Here, the first rising edge is the rising edge of the first waveform, and its duration is the same as the first rising edge duration; the first falling edge is the falling edge of the first waveform, and its duration is the same as the first falling edge duration.

[0079] The second and third waveforms differ. These differences include, for example, the duration of the second waveform differs from that of the third waveform, and / or the amplitude of the second waveform differs from that of the third waveform. This paper primarily uses the difference in duration between the second and third waveforms as an example. The duration of the second rising edge and the duration of the second falling edge are both equal to the duration of the first rising edge. The duration of the second rising edge is equal to the duration of the rising edge of the second waveform, and the duration of the second falling edge is equal to the duration of the falling edge of the second waveform. For example, if the second signal is represented as p1(t), and the duration of the second waveform is T1, then the durations of the first rising edge, the second rising edge, and the second falling edge are all T1 / 2. The durations of the third rising edge and the third falling edge are both equal to the duration of the first falling edge. The duration of the third rising edge is equal to the duration of the rising edge of the third waveform, and the duration of the third falling edge is equal to the duration of the falling edge of the third waveform. For example, if the third signal is represented as p2(t), and the duration of the third waveform is T2, then the durations of the first falling edge, the third rising edge, and the third falling edge are all T2 / 2. That is, the second waveform is symmetrical in the time domain, and its overall duration is twice the duration of the first rising edge. The third waveform is also symmetrical in the time domain, and its overall duration is twice the duration of the first falling edge. The first waveform is derived from the second and third waveforms, which is equivalent to using the rising edge of the second waveform and the falling edge of the third waveform. In other words, the rising edge of the second waveform is used as the rising edge of the first waveform, and the falling edge of the third waveform is used as the falling edge of the first waveform. Thus, the duration of the first waveform is T = T1 / 2 + T2 / 2. Clearly, T is greater than T1. Therefore, this makes the rising edge duration T1 / 2 of the first waveform shorter than the rising edge duration T / 2 of a symmetrical waveform with the same bandwidth, which is beneficial for improving the accuracy of the first-pass diameter measurement. When the transmitting device actually transmits the first signal, assuming that the pulse is transmitted from t=0, it can transmit according to the rising edge waveform of p1(t) within the time period from 0 to T1 / 2, and according to the falling edge waveform of p2(t) within the time period from T1 / 2 to T.

[0080] Both the second and third waveforms are symmetrical in the time domain, therefore the second signal can be implemented in multiple ways, and the third signal can also be implemented in multiple ways. For example, the second signal can be any one of a Gaussian pulse signal, an RRC pulse signal, or a triangular pulse signal. The third signal can also be any one of a Gaussian pulse signal, an RRC pulse signal, or a triangular pulse signal. For example, both the second and third signals can be Gaussian pulse signals; or, both the second and third signals can be RRC pulse signals; or, both the second and third signals can be triangular pulse signals; or, the second signal can be a Gaussian pulse signal and the third signal can be an RRC pulse signal; or, the second signal can be an RRC pulse signal and the third signal can be a Gaussian pulse signal; or, the second signal can be a Gaussian pulse signal and the third signal can be a triangular pulse signal; or, the second signal can be a triangular pulse signal and the third signal can be a Gaussian pulse signal; or, the second signal can be an RRC pulse signal and the third signal can be a triangular pulse signal.

[0081] Furthermore, to satisfy the PSD constraint, the ratio between the duration of the rising edge and the duration of the falling edge of the main lobe must meet a certain relationship. For example, the ratio between the duration of the first rising edge and the duration of the first falling edge must be greater than or equal to a first threshold, which is determined based on the PSD constraint. Ensuring that the ratio between the duration of the first rising edge and the duration of the first falling edge is greater than or equal to the first threshold allows the first waveform to satisfy the PSD constraint. The value of the first threshold is related to the implementation methods of the second and third signals.

[0082] The following are examples of several implementation methods for the second and third signals, and the relevant content of the first threshold is also introduced.

[0083] 1. Both the second and third signals are Gaussian pulse signals.

[0084] For example, the second signal is a Gaussian pulse signal with a narrow main lobe, and the third signal is a Gaussian pulse signal with a wide main lobe. The rising edge of the first waveform is the rising edge of the second signal, and the falling edge of the first waveform is the falling edge of the third signal.

[0085] The time-domain expression of the second signal is:

[0086]

[0087] in c1 is the amplitude contraction factor, BW1 -XdB Let represent the -XdB bandwidth of the second signal, and t represent time. The parameter affecting the main lobe width of the second signal is, for example, BW1. -XdB BW1 -XdB The larger the value, the smaller the main lobe width of the second signal. This can be achieved by adjusting BW1.-XdB The width of the main lobe of the second signal can then be adjusted.

[0088] The time-domain expression of the third signal is:

[0089]

[0090] in c2 is the amplitude contraction factor, BW2 -XdB Let represent the -XdB bandwidth of the third signal, and t represent time. The parameter affecting the main lobe width of the third signal is, for example, BW2. -XdB BW2 -XdB The larger the value, the smaller the main lobe width of the third signal. This can be achieved by adjusting BW2. -XdB The width of the main lobe of the third signal can then be adjusted.

[0091] The time-domain expression of the first signal is, for example:

[0092] p(t)=p1(t)| t≤0 +p2(t)| t>0 (Formula 6)

[0093] For example, p1(0) = p2(0).

[0094] By adjusting BW2 -XdB and / or BW1 -XdB This allows the main lobe width of the second signal to be smaller than that of the third signal, meaning the duration of the first rising edge is shorter than the duration of the first falling edge. For example, under a PSD constraint with a 500MHz channel bandwidth, the rising edge duration of a symmetrical Gaussian pulse waveform is 1.38ns, and the second threshold is thus set to 1.38ns. By setting BW1... -XdB This allows the rising edge duration of the main lobe waveform of the second signal to be less than 1.38 ns, by setting BW2. -XdB This allows the duration of the falling edge of the main lobe waveform of the third signal (or the duration of the rising edge; the main lobe waveform of the third signal is a symmetrical waveform, and the duration of the rising edge is equal to the duration of the falling edge, which will not be elaborated further below) to be greater than or equal to 1.38 ns.

[0095] For reference Figure 8 This is a schematic diagram of the first waveform. Figure 8 The curve shown by the solid line is the first waveform. Figure 8 It is also labeled as "Gauss + Gauss". Figure 8 It also includes the dashed waveform, which is the waveform of the Gaussian pulse sent by existing UWB devices, marked with "Gaussian". As can be seen, the rising edge of the first waveform is significantly shorter compared to the existing Gaussian pulse waveform.

[0096] When both the second and third signals are Gaussian pulses, the first threshold is, for example, [missing information]. For example, the duration of the first rising edge is T. u The duration of the first falling edge is represented by T. d If T represents... u :T d =BW2 -XdB :BW1 -XdB ≥1:2. For example, X=18, BW1 -XdB =1200MHz, BW2 -XdB =600MHz, which allows T u :T d Greater than or equal to 1 / 2. Furthermore, in this case, the spectral efficiency of the first signal is 52%, the same as the spectral efficiency of the corresponding Gaussian pulse. In other words, the embodiments of this application can improve ranging accuracy without changing the spectral efficiency. See also... Figure 9 This is a schematic diagram of the power spectral density of the first signal, with the vertical axis representing the power spectral density in dBm / MHz. Figure 9 The solid line curve represents the first signal (labeled "Gaussian + Gaussian"), and the short dashed line curve represents the existing Gaussian pulse signal (labeled "Gaussian"). Additionally... Figure 9 The long dashed line in the image represents the PSD constraint. As you can see, the first waveform is within the range of the PSD constraint.

[0097] For reference Figure 10 The solid curve represents the received waveform of the first signal (labeled "Gaussian + Gaussian"), and the dashed curve represents the received waveform of the Gaussian pulse signal transmitted by existing UWB equipment (labeled "Gaussian"). The vertical axis represents the amplitude. It can be seen that the main lobe rise time of the first pulse (the main lobe rise time is the duration of the rising edge of the main lobe) is 0.94 ns, while the main lobe rise time of the Gaussian pulse is 1.38 ns. The first waveform has a shorter main lobe rise time, which is more advantageous for the receiving equipment to distinguish between two paths with shorter time intervals based on the received waveform. For example, according to... Figure 10 It can be seen that, compared to a Gaussian pulse signal, it is easier to distinguish two paths with an interval of 2 nanoseconds (ns) using the first signal.

[0098] 2. The second signal is a Gaussian pulse signal, and the third signal is an RRC pulse signal.

[0099] For example, the second signal is a Gaussian pulse signal with a narrow main lobe, and the third signal is an RRC pulse signal with a wide main lobe. The rising edge of the first waveform is the rising edge of the second signal, and the falling edge of the first waveform is the falling edge of the third signal.

[0100] The time-domain expression for the second signal can be found in Formula 4.

[0101] The time-domain expression of the third signal is:

[0102]

[0103] Where α = 0.5, T p2 Here, T is the pulse waveform main lobe width adjustment parameter, c2 is the amplitude contraction factor, and t is time. p2 The larger the value, the larger the main lobe width of the third signal. This can be achieved by adjusting T. p2 The width of the main lobe of the third signal can then be adjusted.

[0104] The time-domain expression of the first signal is, for example:

[0105] p(t)=p1(t)| t≤0 +p2(t)| t>0 (Formula 8)

[0106] For example, p1(0) = p2(0).

[0107] By adjusting BW1 of the second signal -XdB And / or adjust the T of the third signal p2 This allows the main lobe width of the second signal to be smaller than that of the third signal, meaning the duration of the first rising edge is shorter than the duration of the first falling edge. For example, under a PSD constraint with a 500MHz channel bandwidth, the rising edge duration of a symmetrical Gaussian pulse waveform is 1.38ns, and the second threshold is thus set to 1.38ns. By setting BW1... -XdB This allows the rising edge duration of the main lobe waveform of the second signal to be less than 1.38 ns, by setting T. p2 This allows the duration of the falling edge of the main lobe waveform of the third signal to be greater than or equal to 1.38 ns.

[0108] For reference Figure 11 This is a schematic diagram of the first waveform. Figure 11 The curve shown by the solid line is the first waveform. Figure 11 It is labeled with "Gauss + RRC". Figure 11 It also includes the dashed waveform, which is the waveform of the Gaussian pulse sent by existing UWB devices, marked with "Gaussian". As can be seen, the rising edge of the first waveform is significantly shorter compared to the existing Gaussian pulse waveform.

[0109] When the second signal is a Gaussian pulse and the third signal is an RRC pulse, the first threshold is, for example, [missing information]. For example, the duration of the first rising edge is T. u The duration of the first falling edge is represented by T. d If T represents...u :T d ≥1:1.5. For example, X=18, BW1 -XdB =1200MHz, T p2 =2.4ns, which makes T u :T d Greater than or equal to 1 / 1.5. Furthermore, in this case, the spectral efficiency of the first signal is 59%, which is higher than the spectral efficiency of the corresponding Gaussian pulse. In other words, the embodiments of this application can improve both ranging accuracy and spectral efficiency. See also... Figure 12 This is a schematic diagram of the power spectral density of the first signal, with the vertical axis representing the power spectral density in dBm / MHz. Figure 12 The solid line curve represents the first signal (labeled "Gaussian + RRC"), and the short dashed line curve represents the existing Gaussian pulse signal (labeled "Gaussian"). Additionally... Figure 12 The long dashed line in the image represents the PSD constraint. As you can see, the first waveform is within the range of the PSD constraint.

[0110] For reference Figure 13 The solid curve represents the received waveform of the first signal (labeled "Gaussian + RRC"), and the dashed curve represents the received waveform of the Gaussian pulse signal transmitted by existing UWB equipment (labeled "Gaussian"). The vertical axis represents the amplitude. It can be seen that the main lobe rise time of the first pulse is 0.94 ns, while the main lobe rise time of the Gaussian pulse is 1.38 ns. The first waveform has a shorter main lobe rise time, which is more advantageous for the receiving equipment to distinguish between two paths with shorter time intervals based on the received waveform. For example, according to... Figure 13 It can be seen that, compared to a Gaussian pulse signal, it is easier to distinguish two paths with a 2ns interval using the first signal.

[0111] 3. The second signal is a Gaussian pulse signal, and the third signal is a triangular pulse signal.

[0112] For example, the second signal is a Gaussian pulse signal with a narrow main lobe, and the third signal is a triangular pulse signal with a wide main lobe. The rising edge of the first waveform is the rising edge of the second signal, and the falling edge of the first waveform is the falling edge of the third signal.

[0113] The time-domain expression for the second signal can be found in Formula 4.

[0114] The time-domain expression of the third signal is:

[0115] p2(t) = a2t + b2 (Formula 9)

[0116] Among them, 0 <t≤-b2 / a2,a2<0,b2> 0. -b2 / a2 can affect the main lobe width of the third signal. The larger -b2 / a2 is, the larger the main lobe width of the third signal. The main lobe width of the third signal can be adjusted by adjusting -b2 / a2.

[0117] The time-domain expression of the first signal is, for example:

[0118] p(t)=p1(t)| t≤0 +p2(t)| t>0 (Formula 10)

[0119] For example, p1(0) = p2(0).

[0120] By adjusting BW1 of the second signal -XdB By adjusting -b2 / a2 of the third signal, the main lobe width of the second signal can be made smaller than that of the third signal, meaning the duration of the first rising edge is shorter than the duration of the first falling edge. For example, under a PSD constraint with a 500MHz channel bandwidth, the rising edge duration of a symmetrical Gaussian pulse waveform is 1.38ns, and the second threshold is thus set to 1.38ns. This is achieved by setting BW1... -XdB This allows the rising edge duration of the main lobe waveform of the second signal to be less than 1.38ns. By setting -b2 / a2, the falling edge duration of the main lobe waveform of the third signal can be greater than or equal to 1.38ns.

[0121] For reference Figure 14 This is a schematic diagram of the first waveform. Figure 14 The curve shown by the solid line is the first waveform. Figure 14 The symbols are marked with "Gaussian + Triangle". Figure 14 It also includes the dashed waveform, which is the waveform of the Gaussian pulse sent by existing UWB devices, marked with "Gaussian". As can be seen, the rising edge of the first waveform is significantly shorter compared to the existing Gaussian pulse waveform.

[0122] When the second signal is a Gaussian pulse and the third signal is a triangular pulse, the first threshold is, for example, [missing information]. For example, the duration of the first rising edge is T. u The duration of the first falling edge is represented by T. d If T represents... u :T d ≥1:2.4. For example, X=18, BW1 -XdB =1200MHz, -b2 / a2=2.8, which allows T to u :T dGreater than or equal to 1 / 2.4. Furthermore, in this case, the spectral efficiency of the first signal is 48%, which is not significantly different from the spectral efficiency of the corresponding Gaussian pulse. In other words, the embodiments of this application can improve ranging accuracy while basically maintaining spectral efficiency. See also... Figure 15 This is a schematic diagram of the power spectral density of the first signal, with the vertical axis representing the power spectral density in dBm / MHz. Figure 15 The solid curve in the diagram represents the first signal (labeled with "Gaussian + Triangle"), and the short dashed curve represents the existing Gaussian pulse signal (labeled with "Gaussian"). Additionally... Figure 15 The long dashed line in the image represents the PSD constraint. As you can see, the first waveform is within the range of the PSD constraint.

[0123] For reference Figure 16 The solid curve represents the received waveform of the first signal (labeled with "Gaussian + triangle"), and the dashed curve represents the received waveform of the Gaussian pulse signal transmitted by existing UWB equipment (labeled with "Gaussian"). The vertical axis represents the amplitude. It can be seen that the main lobe rise time of the first pulse is 0.94 ns, while the main lobe rise time of the Gaussian pulse is 1.38 ns. The first waveform has a shorter main lobe rise time, which is more advantageous for the receiving equipment to distinguish between two paths with shorter time intervals based on the received waveform. For example, according to... Figure 16 It can be seen that, compared to a Gaussian pulse signal, it is easier to distinguish two paths with a 2ns interval using the first signal.

[0124] 4. The second signal is a triangular pulse signal, and the third signal is a Gaussian pulse signal.

[0125] For example, the second signal is a triangular pulse signal with a narrow main lobe, and the third signal is a Gaussian pulse signal with a wide main lobe. The rising edge of the first waveform is the rising edge of the second signal, and the falling edge of the first waveform is the falling edge of the third signal.

[0126] The time-domain expression of the second signal is:

[0127] p1(t)=a1t+b1 (Formula 11)

[0128] Where -b1 / a1≤t≤0, a1>0, b1>0. b1 / a1 can affect the main lobe width of the second signal. The larger b1 / a1 is, the larger the main lobe width of the third signal. The main lobe width of the third signal can be adjusted by adjusting b1 / a1.

[0129] The time-domain expression for the third signal can be found in Formula 5.

[0130] The time-domain expression of the first signal is, for example:

[0131] p(t)=p1(t)| t≤0+p2(t)| t>0 (Formula 12)

[0132] For example, p1(0) = p2(0).

[0133] By adjusting the second signal b1 / a1 and / or adjusting the third signal BW2 -XdB This allows the main lobe width of the second signal to be smaller than that of the third signal, meaning the duration of the first rising edge is shorter than the duration of the first falling edge. For example, under a PSD constraint with a 500MHz channel bandwidth, the rising edge duration of a symmetrical Gaussian pulse waveform is 1.38ns, and the second threshold is thus set to 1.38ns. By setting b1 / a1, the rising edge duration of the main lobe waveform of the second signal can be made less than 1.38ns; by setting BW2... -XdB This allows the duration of the falling edge of the main lobe waveform of the third signal to be greater than or equal to 1.38 ns.

[0134] For reference Figure 17 This is a schematic diagram of the first waveform. Figure 17 The curve shown by the solid line is the first waveform. Figure 17 The symbols are marked with "trigonometric + Gaussian". Figure 17 It also includes the dashed waveform, which is the waveform of the Gaussian pulse sent by existing UWB devices, marked with "Gaussian". As can be seen, the rising edge of the first waveform is significantly shorter compared to the existing Gaussian pulse waveform.

[0135] When the second signal is a triangular pulse and the third signal is a Gaussian pulse, the first threshold is, for example, [missing information]. For example, the duration of the first rising edge is T. u The duration of the first falling edge is represented by T. d If T represents... u :T d ≥1:1.8. For example, b1 / a1=1.3, X=18, BW2 -XdB =600MHz, which allows T u :T d Greater than or equal to 1 / 1.8. Furthermore, in this case, the spectral efficiency of the first signal is 52%, the same as the spectral efficiency of the corresponding Gaussian pulse. In other words, the embodiments of this application can improve ranging accuracy while maintaining spectral efficiency. See also... Figure 18 This is a schematic diagram of the power spectral density of the first signal, with the vertical axis representing the power spectral density in dBm / MHz. Figure 18 The solid curve in the diagram represents the first signal (labeled with "triangle + Gaussian"), and the short dashed curve represents the existing Gaussian pulse signal (labeled with "Gaussian"). Additionally... Figure 18The long dashed line in the image represents the PSD constraint. As you can see, the first waveform is within the range of the PSD constraint.

[0136] For reference Figure 19 The solid curve represents the received waveform of the first signal (labeled with a triangle and a Gaussian line), and the dashed curve represents the received waveform of the Gaussian pulse signal transmitted by existing UWB equipment (labeled with a Gaussian line). The vertical axis represents the amplitude. It can be seen that the main lobe rise time of the first pulse is 1 ns, while the main lobe rise time of the Gaussian pulse is 1.38 ns. The first waveform has a shorter main lobe rise time, which is more advantageous for the receiving equipment to distinguish between two paths with shorter time intervals based on the received waveform. For example, according to... Figure 19 It can be seen that, compared to a Gaussian pulse signal, it is easier to distinguish two paths with a 2ns interval using the first signal.

[0137] 5. The second signal is a triangular pulse signal, and the third signal is an RRC pulse signal.

[0138] For example, the second signal is a triangular pulse signal with a narrow main lobe, and the third signal is an RRC pulse signal with a wide main lobe. The rising edge of the first waveform is the rising edge of the second signal, and the falling edge of the first waveform is the falling edge of the third signal.

[0139] The time-domain expression for the second signal can be found in Formula 11.

[0140] The time-domain expression for the third signal can be found in Formula 7.

[0141] The time-domain expression of the first signal is, for example:

[0142] p(t)=p1(t)| t≤0 +p2(t)| t>0 (Formula 13)

[0143] For example, p1(0) = p2(0).

[0144] By adjusting the second signal b1 / a1 and / or adjusting the third signal T p2 This allows the main lobe width of the second signal to be smaller than that of the third signal, meaning the duration of the first rising edge is shorter than the duration of the first falling edge. For example, under a PSD constraint with a 500MHz channel bandwidth, the rising edge duration of a symmetrical Gaussian pulse waveform is 1.38ns, and the second threshold is thus set to 1.38ns. By setting b1 / a1, the rising edge duration of the main lobe waveform of the second signal can be made less than 1.38ns. By setting T... p2 This allows the duration of the falling edge of the main lobe waveform of the third signal to be greater than or equal to 1.38 ns.

[0145] For reference Figure 20 This is a schematic diagram of the first waveform. Figure 20 The curve shown by the solid line is the first waveform. Figure 17 It is marked with "triangle + RRC". Figure 20 It also includes the dashed waveform, which is the waveform of the Gaussian pulse sent by existing UWB devices, marked with "Gaussian". As can be seen, the rising edge of the first waveform is significantly shorter compared to the existing Gaussian pulse waveform.

[0146] When the second signal is a triangular pulse and the third signal is an RRC pulse, the first threshold is, for example, [missing information]. For example, the duration of the first rising edge is T. u The duration of the first falling edge is represented by T. d If T represents... u :T d ≥1:1.4. For example, b1 / a1=1.3, T p2 =2.4ns, which makes T u :T d Greater than or equal to 1 / 1.4. Furthermore, in this case, the spectral efficiency of the first signal is 59%, which is higher than the spectral efficiency of the corresponding Gaussian pulse. In other words, the embodiments of this application can improve both ranging accuracy and spectral efficiency. See also... Figure 21 This is a schematic diagram of the power spectral density of the first signal, with the vertical axis representing the power spectral density in dBm / MHz. Figure 21 The solid curve in the diagram represents the first signal (marked with "triangle + RRC"), and the short dashed curve represents the existing Gaussian pulse signal (marked with "Gaussian"). Additionally... Figure 21 The long dashed line in the image represents the PSD constraint. As you can see, the first waveform is within the range of the PSD constraint.

[0147] For reference Figure 22 The solid curve represents the received waveform of the first signal (marked with "triangle + RRC"), and the dashed curve represents the received waveform of the Gaussian pulse signal transmitted by existing UWB equipment (marked with "Gauss"). The vertical axis represents the amplitude. It can be seen that the main lobe rise time of the first pulse is 1 ns, while the main lobe rise time of the Gaussian pulse is 1.38 ns. The first waveform has a shorter main lobe rise time, which is more advantageous for the receiving equipment to distinguish between two paths with shorter time intervals based on the received waveform. For example, according to... Figure 22 It can be seen that, compared to a Gaussian pulse signal, it is easier to distinguish two paths with a 2ns interval using the first signal.

[0148] 6. Both the second and third signals are triangular pulse signals.

[0149] For example, the second signal is a triangular pulse signal with a narrow main lobe, and the third signal is a triangular pulse signal with a wide main lobe. The rising edge of the first waveform is the rising edge of the second signal, and the falling edge of the first waveform is the falling edge of the third signal.

[0150] The time-domain expression for the second signal can be found in Formula 11.

[0151] The time-domain expression for the third signal can be found in Formula 9.

[0152] The time-domain expression of the first signal is, for example:

[0153] p(t)=p1(t)| t≤0 +p2(t)| t>0 (Formula 14)

[0154] For example, p1(0) = p2(0).

[0155] By adjusting the second signal b1 / a1 and / or adjusting the third signal -b2 / a2, the main lobe width of the second signal can be made smaller than the main lobe width of the third signal, meaning the duration of the first rising edge is shorter than the duration of the first falling edge. For example, under a PSD constraint with a 500MHz channel bandwidth, the rising edge duration of a symmetrical Gaussian pulse waveform is 1.38ns, and the second threshold is thus set to 1.38ns. By setting b1 / a1, the rising edge duration of the main lobe waveform of the second signal can be made less than 1.38ns; by setting -b2 / a2, the falling edge duration of the main lobe waveform of the third signal can be greater than or equal to 1.38ns.

[0156] For reference Figure 23 This is a schematic diagram of the first waveform. Figure 23 The curve shown by the solid line is the first waveform. Figure 23 It is marked with "triangle + triangle". Figure 23 It also includes the dashed waveform, which is the waveform of the Gaussian pulse sent by existing UWB devices, marked with "Gaussian". As can be seen, the rising edge of the first waveform is significantly shorter compared to the existing Gaussian pulse waveform.

[0157] When both the second and third signals are triangular pulse signals, the first threshold is, for example, [missing information]. For example, the duration of the first rising edge is T. u The duration of the first falling edge is represented by T. d If T represents... u :T d ≥1:2. For example, b1 / a1 = 1.35, -b2 / a2 = 2.7, which makes T... u :T dGreater than or equal to 1 / 2. Furthermore, in this case, the spectral efficiency of the first signal is 49%, which is not significantly different from the spectral efficiency of the corresponding Gaussian pulse. In other words, the embodiments of this application can improve ranging accuracy while essentially maintaining spectral efficiency. See also... Figure 24 This is a schematic diagram of the power spectral density of the first signal, with the vertical axis representing the power spectral density in dBm / MHz. Figure 24 The solid curve in the diagram represents the first signal (marked with "triangle + triangle"), and the short dashed curve represents the existing Gaussian pulse signal (marked with "Gaussian"). Additionally... Figure 24 The long dashed line in the image represents the PSD constraint. As you can see, the first waveform is within the range of the PSD constraint.

[0158] For reference Figure 25 The solid curve represents the received waveform of the first signal (marked with "triangle + triangle"), and the dashed curve represents the received waveform of the Gaussian pulse signal transmitted by existing UWB equipment (marked with "Gauss"). The vertical axis represents the amplitude. It can be seen that the main lobe rise time of the first pulse is 1 ns, while the main lobe rise time of the Gaussian pulse is 1.38 ns. The first waveform has a shorter main lobe rise time, which is more advantageous for the receiving equipment to distinguish between two paths with shorter time intervals based on the received waveform. For example, according to... Figure 25 It can be seen that, compared to a Gaussian pulse signal, it is easier to distinguish two paths with a 2ns interval using the first signal.

[0159] S702, The transmitting device sends a first signal. Correspondingly, the receiving device receives the first signal.

[0160] After receiving the first signal, the receiving device can detect it. For example, if the transmitting device sends a pulse sequence, the receiving device can perform cross-correlation and other operations on the received pulse sequence to determine which pulse sequence it is. The receiving device also obtains the pulses included in the pulse sequence. For example, if the receiving device obtains the first signal, it can determine the first path of the first signal and thus determine the distance between the receiving device and the transmitting end of the first signal (i.e., the transmitting device) based on the first path. This completes the ranging and also enables the positioning of the transmitting device.

[0161] This application embodiment uses a receiving device for ranging as an example. Alternatively, the transmitting device can send a signal to the receiving device, and after receiving the signal, the receiving device can send a signal back to the transmitting device, which then performs ranging based on the received signal. In this case, the signal sent by the receiving device to the transmitting device after receiving the signal can be the first signal, and there are no restrictions on the signal sent by the transmitting device.

[0162] In this embodiment, the duration of the first rising edge of the first signal is shorter than the duration of the first falling edge. That is, the rise time of the main lobe waveform of the signal generated in this embodiment is shorter. A shorter rise time of the main lobe waveform is more conducive to distinguishing two adjacent paths, or more conducive to identifying the first path of arrival of the received signal. Therefore, using the first signal provided in this embodiment for ranging enables the receiving device to distinguish multipaths with small delay intervals, or enables the receiving device to more accurately determine the arrival time of the first path of arrival of the signal, thereby improving the accuracy of ranging and / or positioning. Furthermore, this embodiment strives to ensure that the duration of the first signal remains constant relative to the duration of existing transmitted signals, thereby reducing the occupation of frequency domain resources.

[0163] Figure 26 A schematic diagram of a signal transmitting device for positioning provided in an embodiment of this application is given. The device 2600 can be... Figure 7 The transmitting device or its circuit system described in the illustrated embodiment is used to implement the method corresponding to the transmitting device in the above method embodiments. Specific functions can be found in the descriptions of the above method embodiments. For example, one type of circuit system is a chip system.

[0164] The device 2600 includes at least one processor 2601, a communication line 2602, and at least one communication interface 2604. As an optional implementation, the device 2600 may also include a memory 2603. Because the memory 2603 is not a mandatory functional module but only an optional one, therefore... Figure 26 The dashed box indicates the area.

[0165] Processor 2601 may include a general-purpose central processing unit (CPU), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits for controlling the execution of programs according to the present application.

[0166] Communication line 2602 may include a path for transmitting information between the aforementioned components.

[0167] The communication interface 2604 uses any transceiver-like device for communicating with other devices or communication networks, such as Ethernet, radio access network (RAN), wireless local area network (WLAN), wired access network, etc.

[0168] Memory 2603 may be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions, or electrically erasable programmable read-only memory (EEPROM), 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, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, but not limited thereto. Memory 2603 may exist independently and be connected to processor 2601 via communication line 2602. Alternatively, memory 2603 may be integrated with processor 2601.

[0169] The memory 2603 stores computer execution instructions for implementing the scheme of this application, and its execution is controlled by the processor 2601. The processor 2601 executes the computer execution instructions stored in the memory 2603, thereby implementing the communication method provided in the above embodiments of this application.

[0170] Optionally, the computer execution instructions in the embodiments of this application may also be referred to as application code, and the embodiments of this application do not specifically limit this.

[0171] In a specific implementation, as one example, the processor 2601 may include one or more CPUs, for example... Figure 26 CPU0 and CPU1 in the CPU.

[0172] In a specific implementation, as one example, the communication device 2600 may include multiple processors, such as... Figure 26 The processors 2601 and 708 are mentioned. Each of these processors can be a single-core (single-CPU) processor or a multi-core (multi-CPU) processor. Here, "processor" can refer to one or more devices, circuits, and / or processing cores used to process data (such as computer program instructions).

[0173] when Figure 26When the illustrated device 2600 is a chip, such as a chip for an access network device, a UPF chip, an SMF chip, or a terminal device chip, then the chip includes a processor 2601 (and may also include a processor 2608), a communication line 2602, a memory 2603, and a communication interface 2604. Specifically, the communication interface 2604 may be an input interface, pins, or circuits, etc. The memory 2603 may be a register, cache, etc. The processor 2601 and processor 2608 may be a general-purpose CPU, microprocessor, ASIC, or one or more integrated circuits for controlling the execution of a program that controls the communication method of any of the above embodiments.

[0174] The processor 2601 can be used to generate a first signal (for example, the processor 2601 can execute computer execution instructions stored in the memory 2603 to generate the first signal). The duration of the first rising edge of the first signal is less than the duration of the first falling edge. The duration of the first rising edge is the duration of the rising edge of the main lobe waveform of the first signal, and the duration of the first falling edge is the duration of the falling edge of the main lobe waveform of the first signal. The processor 2601 transmits the first signal to the communication interface 2604 through the communication line 2602. The communication interface 2604 can be used to send the first signal.

[0175] In one alternative implementation, the first rising edge is determined based on the rising edge of the main lobe waveform of the second signal, and the first falling edge is determined based on the falling edge of the main lobe waveform of the third signal, wherein the main lobe waveform of the second signal is different from the main lobe waveform of the third signal.

[0176] In one optional implementation, the main lobe waveform of the second signal is different from that of the third signal, including: the pulse duration of the main lobe waveform of the second signal is different from that of the main lobe waveform of the third signal.

[0177] In one optional implementation, both the second and third signals are Gaussian pulse signals; or, both the second and third signals are root-raised cosine (RRC) pulse signals; or, both the second and third signals are triangular pulse signals; or, the second signal is a Gaussian pulse signal and the third signal is an RRC pulse signal; or, the second signal is an RRC pulse signal and the third signal is a Gaussian pulse signal; or, the second signal is a Gaussian pulse signal and the third signal is a triangular pulse signal; or, the second signal is a triangular pulse signal and the third signal is a Gaussian pulse signal; or, the second signal is a triangular pulse signal and the third signal is an RRC pulse signal; or, the second signal is an RRC pulse signal and the third signal is a triangular pulse signal.

[0178] In one alternative implementation, the ratio between the duration of the first rising edge and the duration of the first falling edge is greater than a first threshold, which is determined based on a power spectral density constraint.

[0179] In one optional implementation, both the second and third signals are Gaussian pulse signals, and the first threshold is... Alternatively, the second signal is a Gaussian pulse signal, the third signal is an RRC pulse signal, and the first threshold is... Alternatively, the second signal is a Gaussian pulse signal, the third signal is a triangular pulse signal, and the first threshold is... Alternatively, the second signal is a triangular pulse signal, the third signal is a Gaussian pulse signal, and the first threshold is... Alternatively, the second signal is a triangular pulse signal, the third signal is an RRC pulse signal, and the first threshold is... Alternatively, both the second and third signals are triangular pulse signals, and the first threshold is...

[0180] In an optional implementation, if the ranging process is completed by a transmitting device, the transmitting device can first send a signal to a receiving device and then receive the first signal from the receiving device. The signal sent by the transmitting device can be generated by a processor 2601. For example, the processor 2601 can call computer execution instructions stored in memory 2603 to generate the signal. After generating the signal, the processor 2601 transmits the signal to a communication interface 2604 via communication line 2602, and the communication interface 2604 sends the signal. The communication interface 2604 is responsible for receiving the first signal from the receiving device. For example, after receiving the first signal, the communication interface 2604 can transmit the first signal to the processor 2601 via communication line 2602, so that the processor 2601 can process the first signal. For example, the processor 2601 can call computer execution instructions stored in memory 2603 to process the first signal to complete the ranging process.

[0181] This application embodiment can divide the device into functional modules according to the above method example. For example, each function can be divided into its own functional modules, or two or more functions can be integrated into one processing module. The integrated modules can be implemented in hardware or as software functional modules. It should be noted that the module division in this application embodiment is illustrative and only represents one logical functional division. In actual implementation, there may be other division methods. For example, when dividing the device into functional modules according to each function, Figure 27 An apparatus 2700 is shown, which may be a transmitting device involved in the various method embodiments described above, or a chip in a transmitting device. The apparatus 2700 includes a transmitting unit 2701, a processing unit 2702, and a receiving unit 2703.

[0182] Optional, Figure 27The functions / implementation processes of the transmitting unit 2701, receiving unit 2703, and processing unit 2702 can be understood through... Figure 26 The processor 2601 in the memory calls computer execution instructions stored in memory 2603 to implement this. Or, Figure 27 The function / implementation process of the processing unit 2702 in the middle can be achieved through Figure 26 The processor 2601 in the memory calls computer execution instructions stored in memory 2603 to implement this. Figure 27 The functions / implementation of the transmitting unit 2701 and the receiving unit 2703 can be understood through... Figure 26 It is implemented using the 2604 communication interface.

[0183] Optionally, when the device 2700 is a chip or circuit, the functions / implementation of the transmitting unit 2701 and the receiving unit 2703 can also be implemented through pins or circuits, etc.

[0184] For example, the processing unit 2702 can be used to generate a first signal, wherein the duration of the first rising edge of the first signal is less than the duration of the first falling edge, the duration of the first rising edge is the duration of the rising edge of the main lobe waveform of the first signal, and the duration of the first falling edge is the duration of the falling edge of the main lobe waveform of the first signal; the transmitting unit 2701 can be used to transmit the first signal.

[0185] It should be understood that the device 2700 can be used to implement the steps performed by the transmitting device in the method of the embodiments of this application, and the relevant features can be referred to the various embodiments above, which will not be repeated here.

[0186] In the above embodiments, implementation can be achieved entirely or partially through software, hardware, firmware, or any combination thereof. When implemented using software, it can be implemented entirely or partially in the form of a computer program product. The computer program product includes one or more computer instructions. When the computer program instructions are loaded and executed on a computer, all or part of the processes or functions described in the embodiments of this application are generated. The computer can be a general-purpose computer, a special-purpose computer, a computer network, or other programmable device. The computer instructions can be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another. For example, the computer instructions can be transmitted from one website, computer, server, or data center to another website, computer, server, or data center via wired (e.g., coaxial cable, fiber optic, digital subscriber line (DSL)) or wireless (e.g., infrared, wireless, microwave, etc.) means. The computer-readable storage medium can be any available medium that a computer can access or a data storage device such as a server or data center that integrates one or more available media. The available medium can be a magnetic medium (e.g., floppy disk, hard disk, magnetic tape), an optical medium (e.g., DVD), or a semiconductor medium (e.g., solid-state disk (SSD)).

[0187] The various illustrative logic units and circuits described in the embodiments of this application can be implemented or operate the described functions using a general-purpose processor, a digital signal processor (DSP), an application-specific integrated circuit (ASIC), a field-programmable gate array (FPGA), or other programmable logic devices, discrete gate or transistor logic, discrete hardware components, or any combination thereof. The general-purpose processor can be a microprocessor; alternatively, it can be any conventional processor, controller, microcontroller, or state machine. The processor can also be implemented using a combination of computing devices, such as a digital signal processor and a microprocessor, multiple microprocessors, one or more microprocessors combined with a digital signal processor core, or any other similar configuration.

[0188] The steps of the methods or algorithms described in the embodiments of this application can be directly embedded in hardware, software units executed by a processor, or a combination of both. The software units can be stored in RAM, flash memory, ROM, EPROM, EEPROM, registers, hard disks, removable disks, CD-ROMs, or any other form of storage medium in the art. Exemplarily, the storage medium can be connected to the processor so that the processor can read information from and write information to the storage medium. Optionally, the storage medium can also be integrated into the processor. The processor and storage medium can be housed in an ASIC, which can be housed in a terminal device. Optionally, the processor and storage medium can also be housed in different components within the terminal device.

[0189] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0190] Although embodiments of this application have been described in conjunction with specific features and examples, it is obvious that various modifications and combinations can be made without departing from the spirit and scope of the embodiments of this application. Accordingly, the embodiments and drawings of this application are merely exemplary illustrations of the embodiments of this application as defined by the appended claims, and are considered to cover any and all modifications, variations, combinations, or equivalents within the scope of the embodiments of this application. Obviously, those skilled in the art can make various modifications and variations to the embodiments of this application without departing from the scope of the embodiments of this application. Thus, if these modifications and variations of the embodiments of this application fall within the scope of the claims of the embodiments of this application and their equivalents, then the embodiments of this application are also intended to include these modifications and variations.

Claims

1. A method for transmitting a signal for positioning, characterized in that, include: A first signal is generated, wherein the duration of the first rising edge of the first signal is less than the duration of the first falling edge, the duration of the first rising edge is equal to the duration of the rising edge of the main lobe waveform of the first signal, the duration of the first falling edge is equal to the duration of the falling edge of the main lobe waveform of the first signal, the first signal is an ultra-wideband (UWB) signal, the first rising edge is determined based on the rising edge of the main lobe waveform of the second signal, the first falling edge is determined based on the falling edge of the main lobe waveform of the third signal, and the main lobe waveform of the second signal is different from the main lobe waveform of the third signal. Send the first signal; Wherein, the ratio between the duration of the first rising edge and the duration of the first falling edge is greater than a first threshold, which is determined based on the power spectral density constraint condition; wherein, Both the second signal and the third signal are Gaussian pulse signals, and the first threshold is... or, The second signal is a Gaussian pulse signal, the third signal is an RRC pulse signal, and the first threshold is... or, The second signal is a Gaussian pulse signal, the third signal is a triangular pulse signal, and the first threshold is... or, The second signal is a triangular pulse signal, the third signal is a Gaussian pulse signal, and the first threshold is... or, The second signal is a triangular pulse signal, the third signal is an RRC pulse signal, and the first threshold is... or, Both the second signal and the third signal are triangular pulse signals, and the first threshold is...

2. The method according to claim 1, characterized in that, The main lobe waveform of the second signal differs from that of the third signal, including: The pulse duration of the main lobe waveform of the second signal is different from the pulse duration of the main lobe waveform of the third signal.

3. The method according to claim 2, characterized in that, Both the second signal and the third signal are Gaussian pulse signals; or, Both the second signal and the third signal are root-raised cosine RRC pulse signals; or, Both the second signal and the third signal are triangular pulse signals; or, The second signal is a Gaussian pulse signal, and the third signal is an RRC pulse signal; or, The second signal is an RRC pulse signal, and the third signal is a Gaussian pulse signal; or, The second signal is a Gaussian pulse signal, and the third signal is a triangular pulse signal; or, The second signal is a triangular pulse signal, and the third signal is a Gaussian pulse signal; or, The second signal is a triangular pulse signal, and the third signal is an RRC pulse signal; or, The second signal is an RRC pulse signal, and the third signal is a triangular pulse signal.

4. A signal transmitting device for positioning, characterized in that, include: A processor is configured to generate a first signal, wherein the duration of a first rising edge of the first signal is less than the duration of a first falling edge, the duration of the first rising edge is equal to the duration of the rising edge of the main lobe waveform of the first signal, the duration of the first falling edge is equal to the duration of the falling edge of the main lobe waveform of the first signal, the first signal is a UWB signal, the first rising edge is determined based on the rising edge of the main lobe waveform of a second signal, the first falling edge is determined based on the falling edge of the main lobe waveform of a third signal, and the main lobe waveform of the second signal is different from the main lobe waveform of the third signal. A transceiver for transmitting the first signal; Wherein, the ratio between the duration of the first rising edge and the duration of the first falling edge is greater than a first threshold, which is determined based on the power spectral density constraint condition; wherein, Both the second signal and the third signal are Gaussian pulse signals, and the first threshold is... or, The second signal is a Gaussian pulse signal, the third signal is an RRC pulse signal, and the first threshold is... or, The second signal is a Gaussian pulse signal, the third signal is a triangular pulse signal, and the first threshold is... or, The second signal is a triangular pulse signal, the third signal is a Gaussian pulse signal, and the first threshold is... or, The second signal is a triangular pulse signal, the third signal is an RRC pulse signal, and the first threshold is... or, Both the second signal and the third signal are triangular pulse signals, and the first threshold is...

5. The apparatus according to claim 4, characterized in that, The main lobe waveform of the second signal differs from that of the third signal, including: The pulse duration of the main lobe waveform of the second signal is different from the pulse duration of the main lobe waveform of the third signal.

6. The apparatus according to claim 5, characterized in that, Both the second signal and the third signal are Gaussian pulse signals; or, Both the second signal and the third signal are root-raised cosine RRC pulse signals; or, Both the second signal and the third signal are triangular pulse signals; or, The second signal is a Gaussian pulse signal, and the third signal is an RRC pulse signal; or, The second signal is an RRC pulse signal, and the third signal is a Gaussian pulse signal; or, The second signal is a Gaussian pulse signal, and the third signal is a triangular pulse signal; or, The second signal is a triangular pulse signal, and the third signal is a Gaussian pulse signal; or, The second signal is a triangular pulse signal, and the third signal is an RRC pulse signal; or, The second signal is an RRC pulse signal, and the third signal is a triangular pulse signal.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium is used to store a computer program that, when run on a computer, causes the computer to perform the method as described in any one of claims 1 to 3.

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