WO2023134530A1

WO2023134530A1 - Pilot frequency pattern mapping method and system for reference signal, and related apparatus

Info

Publication number: WO2023134530A1
Application number: PCT/CN2023/070624
Authority: WO
Inventors: 李成
Original assignee: 华为技术有限公司
Priority date: 2022-01-12
Filing date: 2023-01-05
Publication date: 2023-07-20
Also published as: CN116471156A

Abstract

Provided in the present application are a pilot frequency pattern mapping method and system for a reference signal, and a related apparatus. The method comprises: a first device generating a first reference signal, wherein a first pilot frequency pattern mapping mode used by the first reference signal is generated according to a first pseudo-random sequence, and the first pilot frequency pattern mapping mode indicates a mode in which the first reference signal occupies an OFDM sub-carrier in a frequency domain; and then, the first device sending the first reference signal according to the first pilot frequency pattern mapping mode. By means of the method, sidelobe interference with a first reference signal during a transmission process can be suppressed, thereby improving the precision of time measurement based on the first reference signal, and further improving the positioning precision.

Description

Reference signal pilot pattern mapping method, system and related device

This application claims the priority of the Chinese patent application with the application number 202210033021.8 and the application name "Pilot Pattern Mapping Method, System and Related Devices for Reference Signals" submitted to the China Patent Office on January 12, 2022, the entire content of which is passed References are incorporated in this application.

technical field

The present application relates to the field of communication technologies, and in particular to a pilot pattern mapping method, system and related devices of reference signals.

Background technique

In recent years, with the rapid development of communication technology, how to locate electronic devices has become a topic of increasing concern. Multiple electronic devices can be positioned by sending and receiving reference signals. The reference signals can be positioning reference signals (positioning reference signals, PRS), channel sounding reference signals (sounding reference signals, SRS) channel state information reference signals (CSI reference signals, CSI-RS), sidelink-positioning reference signal (sidelink-positioning reference signal, SL-PRS), or sidelink-sounding reference signal (sidelink-sounding reference signal, SL-SRS), etc. At present, when positioning an electronic device based on a cellular network communication technology, a uniform mapping method is used for a pilot pattern of a reference signal, and the pilot pattern of a reference signal may be implemented as shown in FIG. 1 . Specifically: the reference signal occupies subcarriers at a fixed period in an Orthogonal Frequency Division Multiplexing (OFDM) symbol, and the subcarrier spacing between any two adjacent subcarriers occupied by the reference signal is the same. On an OFDM symbol, the distribution period followed by the subcarriers occupied by the reference signal in the frequency domain is called the comb fraction.

When the reference signal occupies subcarriers with a fixed period in the OFDM symbol, in order to reduce the impact of sidelobe interference, the number of OFDM symbols occupied by the reference signal should be greater than the number of combs. However, since the priority of cellular network communication is higher than that of device-to-device (D2D) communication, in order to avoid impact on the performance of cellular network communication, positioning of electronic devices based on D2D technology , the number of OFDM symbols that can be occupied by the reference signal is limited. At this time, the reference signal occupying subcarriers with a fixed period in the OFDM symbol will cause relatively large sidelobe interference, thereby affecting the accuracy of sending and receiving signals.

Contents of the invention

The reference signal pilot pattern mapping method, system and related devices provided in this application can suppress the sidelobe interference of the reference signal during transmission, improve the time measurement accuracy based on the reference signal, and further improve the positioning accuracy.

In a first aspect, an embodiment of the present application provides a method for mapping a pilot pattern of a reference signal, the method is applied to a first device, and the method for mapping a pilot pattern of a reference signal includes: the first device generates a first reference signal, and the first The first pilot pattern mapping method adopted by the reference signal is generated according to the first pseudo-random sequence, and the first pilot pattern mapping method indicates a method for the first reference signal to occupy OFDM subcarriers in the frequency domain. In some implementation manners, an equivalent description of the manner in which the first reference signal occupies the OFDM subcarrier in the frequency domain may be: the manner in which the first reference signal is mapped to the physical resources in the frequency domain (mapping to the physical resources). Afterwards, the first device sends the first reference signal according to the first pilot pattern mapping manner.

Sidelobe interference suffered by the first reference signal during transmission is related to the number of OFDM symbols occupied by the first reference signal, and the smaller the number of OFDM symbols occupied by the first reference signal, the greater the sidelobe interference. Since the first reference signal occupies subcarriers in a pseudo-random manner within the OFDM symbol, the sidelobe interference suffered by the first reference signal during transmission will be suppressed. Therefore, by implementing the method of the first aspect, the first reference signal can be suppressed The signal is subjected to side lobe interference during transmission, which improves the time measurement accuracy based on the first reference signal and further improves the positioning accuracy.

With reference to the first aspect, in some implementations, the first pseudo-random sequence is an m-sequence or a Gold sequence. In addition, in some other implementation manners, the first pseudo-random sequence may also be an m-sequence or other pseudo-random sequences other than the Gold sequence.

With reference to the first aspect, in some implementations, the first pilot pattern mapping method used by the first reference signal is generated based on the first pseudo-random sequence specifically includes: the first device may, based on a modulation technique, such as a QPSK modulation technique, etc. A pseudo-random sequence is converted into a first reference signal, the first reference signal includes one or more modulation symbols, and is mapped to one or more orthogonal subcarriers for transmission. The first reference signal occupies one or more OFDM symbols, and the interval between the subcarrier occupied by the m modulation symbol of the first reference signal and the subcarrier occupied by the m+1 modulation symbol is p(m), where m is A positive integer, p(m) is generated according to the first pseudo-random sequence.

Through the previous implementation manner, the first device may generate the first reference signal according to the first pseudo-random sequence.

With reference to the first aspect, in some implementations, the first reference signal is determined by the second pseudo-random sequence, and the first pseudo-random sequence and the second pseudo-random sequence are related or identical. The pilot pattern of the first reference signal is used to indicate the frequency domain mapping manner of the first reference signal. Through the above implementation manner, if the first pseudo-random sequence and the second pseudo-random sequence are correlated or identical, when the first device sends the first reference signal, it does not need to additionally send other information for generating the pilot pattern. In this way, the overhead of pilot pattern indication signaling required by the first device to send the first reference signal can be reduced.

With reference to the first aspect, in some implementation manners, the first pilot pattern mapping manner is generated according to the number of OFDM symbols occupied by the first reference signal.

Through the previous implementation, the first device can further thin the frequency domain interval, and can further increase the power of subcarriers occupied by the frequency domain while ensuring the same power in the time domain, improve the signal-to-noise ratio and suppress the impact of noise.

With reference to the first aspect, in some implementations, the first reference signal occupies multiple OFDM symbols in the frequency domain, and positions of start subcarriers of the multiple OFDM symbols occupied by the first reference signal are offset.

With reference to the first aspect, in some implementations, the location of the start subcarriers of the multiple OFDM symbols occupied by the first reference signal is offset includes: the first reference signal occupies N OFDM symbols, and the first reference signal occupies N OFDM symbols. The position of the first subcarrier occupied in the i-th OFDM symbol in the i-th OFDM symbol, and, the position of the first sub-carrier occupied by the first reference signal in the j-th OFDM symbol in the j-th OFDM symbol same or different, i and j are positive integers less than or equal to N and not the same.

Through the previous embodiment, the channel information of different frequency points of the first reference signal can complement each other, reduce frequency domain blanking, improve channel measurement accuracy and randomization of noise interference, and further improve the positioning performance of the positioning system.

With reference to the first aspect, in some implementation manners, the first reference signal occupies a plurality of continuous or discontinuous OFDM symbols in the time domain.

Through the previous implementation manner, the first device will discontinuously send the first reference signal to the second device in the time domain. The first device may perform antenna switching by using the intermittent transmission of the first reference signal, and use different antennas to transmit different OFDM symbols. In this way, the space diversity gain of the system can be improved, and the influence of system hardware factors on the transmission of the first reference signal can be reduced. In addition, different OFDM symbols are sent independently, which can reduce the impact of continuous system errors. The receiving end uses the symbols of each reference signal to independently perform channel measurement, and then combine them to improve system performance.

With reference to the first aspect, in some implementations, the pilot pattern mapping method of the reference signal further includes: the first device generates a second reference signal, and the second pilot pattern mapping method indicates that the second reference signal occupies an OFDM subcarrier in the frequency domain In this manner, the OFDM symbols occupied by the second reference signal in the frequency domain are different from the OFDM symbols occupied by the first reference signal in the frequency domain. The first device sends the second reference signal according to the second pilot pattern mapping manner, the first reference signal and the second reference signal are both sent within a first time period, the first time period is less than a threshold, and the threshold is a smaller value.

Through the above implementation manner, the first device can realize time division multiplexing, improve the capacity of the positioning system, and support more users accessing the network to send and receive reference signals at the same time. If the way of cross-multiplexing is used, the diversity gain of the system can be improved. If continuous symbol multiplexing is used, multi-symbol joint estimation can be enabled to improve correlation gain.

With reference to the first aspect, in some implementations, the first reference signal is used by the second device to receive according to the first pilot pattern mapping manner, and determine the absolute position of the second device according to the relevant information of the first reference signal, or, The position of the second device relative to the first device.

Wherein, the manner in which the second device learns the first pilot pattern mapping method may be any of the following: the manufacturers of the first device and the second device set and store the first pilot pattern mapping method in the first device and the second device. Among the second devices: the first device and the second device jointly determine the first pilot pattern mapping method through negotiation; the first device sends the first pilot pattern mapping method to the second device before sending the first reference signal.

Through the above implementation manner, the first reference signal may be used by the second device to determine the absolute position of the second device, or the position of the second device relative to the first device.

With reference to the first aspect, in some implementations, the relevant information of the first reference signal includes any one or more of the following: the time of sending the first reference signal carried by the first reference signal, the time of receiving the first reference signal, the time of receiving the first reference signal, A field strength of a reference signal, or an incident angle of a first reference signal. The time of sending the first reference signal and the time of receiving the first reference signal carried in the first reference signal may be used to determine the distance between the first device and the second device. The field strength of the first reference signal includes the field strength of the transmitted first reference signal carried by the first reference signal and the field strength of the received first reference signal. The field strength of the first reference signal can be used to determine the first device and The distance between the second device. The angle of incidence of the first reference signal may be used to determine the orientation angle between the first device and the second device.

With reference to the first aspect, in some implementation manners, the first device is a car machine, a mobile phone, or a roadside unit (RSU).

In a second aspect, the embodiment of the present application provides a pilot pattern mapping method of a reference signal, the method is applied to a second device, and the method includes: the second device receives the first reference signal according to the first pilot pattern mapping method, The first pilot pattern mapping method adopted by the first reference signal is generated according to the first pseudo-random sequence, and the first pilot pattern mapping method indicates a method in which the first reference signal occupies the OFDM subcarrier in the frequency domain.

With reference to the second aspect, in some implementations, the first pseudo-random sequence is an m-sequence or a Gold sequence.

With reference to the second aspect, in some implementations, the first pilot pattern mapping method adopted by the first reference signal is generated according to the first pseudo-random sequence, including: the first device may convert the first reference signal into multiple Modulation symbols are modulated onto multiple orthogonal subcarriers for parallel transmission. The first reference signal occupies one or more OFDM symbols, the interval between the subcarrier occupied by the mth modulation symbol of the first reference signal and the subcarrier occupied by the m+1th modulation symbol is p(m), and m is a positive integer , p(m) is generated according to the first pseudo-random sequence.

With reference to the second aspect, in some implementations, the first reference signal is determined by the second pseudo-random sequence, and the first pseudo-random sequence and the second pseudo-random sequence are correlated or identical.

With reference to the second aspect, in some implementation manners, the first pilot pattern mapping manner is generated according to the number of OFDM symbols occupied by the first reference signal.

With reference to the second aspect, in some implementations, the first reference signal occupies multiple OFDM symbols in the frequency domain, and positions of start subcarriers of the multiple OFDM symbols occupied by the first reference signal are offset.

In conjunction with the second aspect, in some implementations, the location of the start subcarriers of the multiple OFDM symbols occupied by the first reference signal is offset includes: the first reference signal occupies N OFDM symbols, and the first reference signal occupies N OFDM symbols, and the first reference signal The position of the first subcarrier occupied in the i-th OFDM symbol in the i-th OFDM symbol, and, the position of the first sub-carrier occupied by the first reference signal in the j-th OFDM symbol in the j-th OFDM symbol same or different, i and j are positive integers less than or equal to N and not the same.

With reference to the second aspect, in some implementation manners, the first reference signal occupies a plurality of continuous or discontinuous OFDM symbols in the time domain.

With reference to the second aspect, in some implementations, the reference signal pilot pattern mapping method further includes: the second device determines the absolute position of the second device according to the relevant information of the first reference signal, or, the second device is relative to the first reference signal. A device location.

With reference to the second aspect, in some implementations, the relevant information of the first reference signal includes any one or more of the following: the time of sending the first reference signal carried by the first reference signal, the time of receiving the first reference signal, the time of receiving the first reference signal, A field strength of a reference signal, or an incident angle of a first reference signal.

With reference to the second aspect, in some implementation manners, the second device includes a car machine and a mobile phone.

In a third aspect, an embodiment of the present application provides an electronic device, the electronic device includes a memory and a processor, the memory is used to store a computer program, and the processor is used to call the computer program, so that the electronic device performs the first aspect or the second aspect The pilot pattern mapping method provided by any one of the implementation manners.

In a fourth aspect, the embodiment of the present application provides a computer program product containing instructions, and when the computer program product is run on an electronic device, the electronic device executes the computer program provided in any one of the implementation manners of the first aspect or the second aspect. The pilot pattern mapping method.

In the fifth aspect, the embodiment of the present application provides a computer-readable storage medium, including instructions. When the instructions are run on the electronic device, the electronic device executes the method provided in any one of the implementation manners of the first aspect or the second aspect. Pilot pattern mapping method.

For the technical effects of the technical solutions provided in the second aspect to the fifth aspect, reference may be made to the related description in the first aspect.

Implementing the technical solution provided by this application can suppress the sidelobe interference of the first reference signal during transmission, improve the time measurement accuracy based on the first reference signal, and further improve the positioning accuracy.

Description of drawings

FIG. 1 is a schematic diagram of a pilot pattern of a reference signal using a uniform mapping method provided by an embodiment of the present application;

2A to 2C are schematic structural diagrams of a communication system 10 provided by an embodiment of the present application;

FIG. 3 is a schematic diagram of a hardware structure of an electronic device 100 provided by an embodiment of the present application;

FIG. 4 is a schematic flowchart of a method for mapping a pilot pattern of a reference signal according to an embodiment of the present application;

5A to 5C are schematic diagrams of pilot patterns of some reference signals provided by the embodiments of the present application;

FIG. 5D(1), FIG. 5D(2), FIG. 5E(1) and FIG. 5E(2) are schematic diagrams of pilot patterns of some reference signals provided by the embodiments of the present application.

Detailed ways

The technical solutions in the embodiments of the present application will be described clearly and in detail below in conjunction with the accompanying drawings. Among them, in the description of the embodiments of this application, unless otherwise specified, "/" means or means, for example, A/B can mean A or B; "and/or" in the text is only a description of associated objects The association relationship indicates that there may be three kinds of relationships, for example, A and/or B, which may indicate: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiment of the present application , "plurality" means two or more than two.

Hereinafter, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as implying or implying relative importance or implicitly specifying the quantity of indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the embodiments of the present application, unless otherwise specified, the "multiple" The meaning is two or more.

Embodiments of the present application provide a reference signal pilot pattern mapping method, system and related devices.

In this method, the first device may generate a first reference signal, and a first pilot pattern mapping method adopted by the first reference signal is generated according to a first pseudo-random sequence, and the first pilot pattern mapping method indicates that the first reference signal is The domain occupies the way of OFDM subcarriers. Afterwards, the first device may send the first reference signal according to the first pilot pattern mapping manner.

Sidelobe interference suffered by the first reference signal during transmission is related to the number of OFDM symbols occupied by the first reference signal, and the smaller the number of OFDM symbols occupied by the first reference signal, the greater the sidelobe interference. Since the first reference signal occupies subcarriers in a pseudo-random manner within the OFDM symbol, the sidelobe interference suffered by the first reference signal during transmission will be suppressed, therefore, by implementing the method of the first aspect, the first reference signal can be suppressed The signal is subjected to side lobe interference during transmission, which improves the time measurement accuracy based on the first reference signal and further improves the positioning accuracy.

In some embodiments, the first pilot pattern mapping manner is generated according to the number of OFDM symbols occupied by the first reference signal.

Through the above method, the sparseness of the frequency domain interval can be realized, and the receiving end performs joint processing based on multiple positioning reference symbols. Under the condition of ensuring the same power in the time domain, the power of the occupied subcarriers in the frequency domain can be further increased, the signal-to-noise ratio can be improved, and the influence of noise can be suppressed. In some embodiments, the first reference signal occupies multiple OFDM symbols in the frequency domain, and positions of start subcarriers of the multiple OFDM symbols occupied by the first reference signal are offset.

If the first reference signal occupies multiple OFDM symbols, and the first reference signal occupies the same subcarriers in multiple OFDM symbols, the second device may lose channels at some frequency points when receiving the first reference signal information. By implementing this method, the channel information of different frequency points can complement each other, reduce the frequency domain blank situation, improve the channel measurement accuracy and the randomization of noise interference, and then improve the positioning performance of the positioning system.

In some embodiments, the first reference signal occupies a plurality of continuous or discontinuous OFDM symbols in the time domain.

To implement the method, when the first reference signal occupies a plurality of OFDM symbols discontinuous in the time domain, the first device will discontinuously send the first reference signal in the time domain. The first device may perform antenna switching by using the intermittent transmission of the first reference signal, and use different antennas to transmit different OFDM symbols. In this way, the space diversity gain of the system can be improved, and the influence of system hardware factors on the transmission of the first reference signal can be reduced. In addition, different OFDM symbols are sent independently, which can reduce the impact of continuous system errors. The receiving end uses the symbols of each reference signal to independently perform channel measurement, and then combine them to improve system performance.

In some embodiments, the first device may send the first reference signal to the second device, and send the second reference signal to the third device, and the OFDM symbol occupied by the second reference signal in the frequency domain is the same as that occupied by the first reference signal in the frequency domain. The OFDM symbols of are different, and both the first reference signal and the second reference signal are sent within a first time period, and the first time period is less than a threshold.

By implementing the method, the first device can implement time-division multiplexing, which increases the capacity of the system and supports more users accessing the network at the same time for mutual positioning. If the way of cross-multiplexing is used, the diversity gain of the system can be improved. If continuous symbol multiplexing is used, multi-symbol joint estimation can be enabled to improve correlation gain.

Firstly, the communication system provided by the embodiment of the present application is introduced.

The communication system provided in this embodiment of the present application may include: an electronic device 100 and an electronic device 200 .

In some embodiments, the electronic device 100 and the electronic device 200 can be realized as a portable electronic device as shown in FIG. Personal digital assistant (personal digital assistant, PDA) and so on. Exemplary embodiments of the electronic device 100 and the electronic device 200 include, but are not limited to, electronic devices running iOS, android, microsoft, or other operating systems.

In some embodiments, the electronic device 100 can be implemented as a portable electronic device as shown in FIG. personal digital assistant, PDA) and so on. Exemplary embodiments of the electronic device 100 include, but are not limited to, electronic devices running iOS, android, microsoft, or other operating systems. The electronic device 200 can be implemented as one or more roadside units (roadside unit, RSU). The RSU is installed on the roadside, has a communication function and continuously detects nearby electronic devices.

In some embodiments, as shown in FIG. 2C , the communication system may include not only the electronic device 100 and the electronic device 200 , but also a base station 300 and a server 400 . The electronic device 100 or the electronic device can communicate with the base station 300 , and the base station 300 can communicate with the server 400 . For the description of the implementation forms of the electronic device 100 and the electronic device 200, reference may be made to the relevant descriptions of the electronic device 100 and the electronic device 200 in FIG. 2A and FIG. 2B above, and details are not repeated here.

The electronic device 100 and the electronic device 200 are electronic devices capable of performing information transmission based on OFDM technology. When the electronic device 100 and the electronic device 200 transmit information based on the OFDM technology, the information to be transmitted can be converted into multiple low-speed sub-data streams, modulated onto multiple orthogonal sub-carriers for parallel transmission. Signals transmitted in parallel on different sub-carriers appear in the time domain and frequency domain, and can present a specific pattern, which is called the pilot pattern of the signal.

Communication between the electronic device 100 and the electronic device 200 may be based on various wireless communication technologies. Exemplarily, D2D communication can be performed between the electronic device 100 and the electronic device 200 . D2D communication is a communication method in which multiple electronic devices within a certain distance directly communicate with each other. D2D communication may also be called Sidelink communication. Multiple electronic devices supporting D2D communication can not only connect and allocate resources under the control of the base station, but also exchange information when there is no network infrastructure. D2D communication may include the following three modes: D2D communication under cellular network coverage, D2D communication under partial cellular network coverage, and D2D communication without cellular network coverage. Wherein: when the electronic device 100 and the electronic device 200 perform D2D communication under the coverage of the cellular network, the establishment of the connection between the electronic device 100 and the electronic device 200 and the determination of the channel resources occupied by the communication are all completed under the control of the base station. When the electronic device 100 and the electronic device 200 perform D2D communication under partial cellular network coverage, the base station only plays an auxiliary control role for the device communication. The base station is responsible for guiding the electronic device 100 and the electronic device 200 to establish a connection, and the channel resources occupied by the communication are determined by The electronic device 100 and the electronic device 200 are selected by themselves. When the electronic device 100 and the electronic device 200 perform D2D communication without cellular network coverage, the base station does not participate in the device communication, the connection establishment between the electronic device 100 and the electronic device 200, and the allocation of channel resources are performed by the electronic device 100 and the electronic device 200 Complete independently.

When communicating based on the D2D technology, the electronic device 100 and the electronic device 200 can use channels that are orthogonal to the communicating cellular users in the cell, or multiplex the same channel with other communicating cellular users. In the case of multiplexing the same channel with other communicating cellular users, the electronic device 100 and the electronic device 200 perform D2D communication, which will cause interference to cellular network communication. Since the priority of the cellular network communication is higher than that of the D2D communication, the time domain resources that can be used by the D2D communication are limited to a certain extent.

In the embodiment of the present application, the D2D communication between the electronic device 100 and the electronic device 200 is the D2D communication under partial cellular network coverage, or the D2D communication under no cellular network coverage, and the electronic device 100 and the electronic device 200 can choose to perform D2D communication. The channel resources occupied during communication, and the pilot pattern of the transmitted signal is determined by itself.

Electronic devices involved in the embodiments of the present application are introduced below.

The hardware structure of the electronic device 100 is introduced below. For the hardware structure of the electronic device 200, reference may be made to the relevant description of the electronic device 100, which will not be repeated here.

FIG. 3 shows a schematic diagram of a hardware structure of an electronic device 100 provided by an embodiment of the present application.

The electronic device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (universal serial bus, USB) interface 130, a charging management module 140, a power management module 141, a battery 142, an antenna 1, and an antenna 2 , mobile communication module 150, wireless communication module 160, audio module 170, speaker 170A, receiver 170B, microphone 170C, earphone jack 170D, sensor module 180, button 190, motor 191, indicator 192, camera 193, display screen 194, and A subscriber identification module (subscriber identification module, SIM) card interface 195 and the like. The sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, bone conduction sensor 180M, etc.

It can be understood that, the structure illustrated in the embodiment of the present application does not constitute a specific limitation on the electronic device 100 . In other embodiments of the present application, the electronic device 100 may include more or fewer components than shown in the figure, or combine certain components, or separate certain components, or arrange different components. The illustrated components can be realized in hardware, software or a combination of software and hardware.

The processor 110 may include one or more processing units, for example: the processor 110 may include an application processor (application processor, AP), a modem processor, a graphics processing unit (graphics processing unit, GPU), an image signal processor (image signal processor, ISP), controller, memory, video codec, digital signal processor (digital signal processor, DSP), baseband processor, and/or neural network processor (neural-network processing unit, NPU) wait. Wherein, different processing units may be independent devices, or may be integrated in one or more processors.

Wherein, the controller may be the nerve center and command center of the electronic device 100 . The controller can generate an operation control signal according to the instruction opcode and timing signal, and complete the control of fetching and executing the instruction.

A memory may also be provided in the processor 110 for storing instructions and data. In some embodiments, the memory in processor 110 is a cache memory. The memory may hold instructions or data that the processor 110 has just used or recycled. If the processor 110 needs to use the instruction or data again, it can be called directly from the memory. Repeated access is avoided, and the waiting time of the processor 110 is reduced, thereby improving the efficiency of the system.

In some embodiments, processor 110 may include one or more interfaces. The interface may include an integrated circuit (inter-integrated circuit, I2C) interface, an integrated circuit built-in audio (inter-integrated circuit sound, I2S) interface, a pulse code modulation (pulse code modulation, PCM) interface, a universal asynchronous transmitter (universal asynchronous receiver/transmitter, UART) interface, mobile industry processor interface (mobile industry processor interface, MIPI), general-purpose input and output (general-purpose input/output, GPIO) interface, subscriber identity module (subscriber identity module, SIM) interface, and /or universal serial bus (universal serial bus, USB) interface, etc.

The wireless communication function of the electronic device 100 can be realized by the antenna 1 , the antenna 2 , the mobile communication module 150 , the wireless communication module 160 , a modem processor, a baseband processor, and the like.

Antenna 1 and Antenna 2 are used to transmit and receive electromagnetic wave signals. Each antenna in electronic device 100 may be used to cover single or multiple communication frequency bands. Different antennas can also be multiplexed to improve the utilization of the antennas. For example: Antenna 1 can be multiplexed as a diversity antenna of a wireless local area network. In other embodiments, the antenna may be used in conjunction with a tuning switch.

The mobile communication module 150 can provide wireless communication solutions including 2G/3G/4G/5G applied on the electronic device 100 . The mobile communication module 150 may include at least one filter, switch, power amplifier, low noise amplifier (low noise amplifier, LNA) and the like. The mobile communication module 150 can receive electromagnetic waves through the antenna 1, filter and amplify the received electromagnetic waves, and send them to the modem processor for demodulation. The mobile communication module 150 can also amplify the signals modulated by the modem processor, and convert them into electromagnetic waves and radiate them through the antenna 1 . In some embodiments, at least part of the functional modules of the mobile communication module 150 may be set in the processor 110 . In some embodiments, at least part of the functional modules of the mobile communication module 150 and at least part of the modules of the processor 110 may be set in the same device.

A modem processor may include a modulator and a demodulator. Wherein, the modulator is used for modulating the low-frequency baseband signal to be transmitted into a medium-high frequency signal. The demodulator is used to demodulate the received electromagnetic wave signal into a low frequency baseband signal. Then the demodulator sends the demodulated low-frequency baseband signal to the baseband processor for processing. The low-frequency baseband signal is passed to the application processor after being processed by the baseband processor. The application processor outputs sound signals through audio equipment (not limited to speaker 170A, receiver 170B, etc.), or displays images or videos through display screen 194 . In some embodiments, the modem processor may be a stand-alone device. In some other embodiments, the modem processor may be independent from the processor 110, and be set in the same device as the mobile communication module 150 or other functional modules.

The wireless communication module 160 can provide D2D communication technology, wireless local area networks (wireless local area networks, WLAN) (such as wireless fidelity (Wi-Fi) network), bluetooth (bluetooth, BT) applied on the electronic device 100. , global navigation satellite system (global navigation satellite system, GNSS), frequency modulation (frequency modulation, FM), near field communication technology (near field communication, NFC), infrared technology (infrared, IR) and other wireless communication solutions. The wireless communication module 160 may be one or more devices integrating at least one communication processing module. The wireless communication module 160 receives electromagnetic waves via the antenna 2 , frequency-modulates and filters the electromagnetic wave signals, and sends the processed signals to the processor 110 . The wireless communication module 160 can also receive the signal to be sent from the processor 110 , frequency-modulate it, amplify it, and convert it into electromagnetic waves through the antenna 2 for radiation.

In some embodiments, the antenna 1 of the electronic device 100 is coupled to the mobile communication module 150, and the antenna 2 is coupled to the wireless communication module 160, so that the electronic device 100 can communicate with the network and other devices through wireless communication technology. The wireless communication technology may include global system for mobile communications (GSM), general packet radio service (general packet radio service, GPRS), code division multiple access (code division multiple access, CDMA), broadband Code division multiple access (wideband code division multiple access, WCDMA), time division code division multiple access (time-division code division multiple access, TD-SCDMA), long term evolution (long term evolution, LTE), BT, GNSS, WLAN, NFC , FM, and/or IR techniques, etc. The GNSS may include a global positioning system (global positioning system, GPS), a global navigation satellite system (global navigation satellite system, GLONASS), a Beidou navigation satellite system (beidou navigation satellite system, BDS), a quasi-zenith satellite system (quasi -zenith satellite system (QZSS) and/or satellite based augmentation systems (SBAS).

In the embodiment of the present application, the electronic device 100 can establish a D2D connection with the outside world through the wireless communication module 160, and perform information transmission based on the D2D connection, so as to support the electronic device 100 to execute the reference signal pilot pattern mapping method provided in the subsequent method embodiments. .

The electronic device 100 realizes the display function through the GPU, the display screen 194 , and the application processor. The GPU is a microprocessor for image processing, and is connected to the display screen 194 and the application processor. GPUs are used to perform mathematical and geometric calculations for graphics rendering. Processor 110 may include one or more GPUs that execute program instructions to generate or change display information.

In the embodiment of the present application, the electronic device 100 may display prompt information through the display screen 194 after the positioning is completed. The prompt information may be used to prompt the absolute position of the electronic device 100 or the position of the electronic device 100 relative to the electronic device 200 .

FIG. 4 exemplarily shows a schematic flow chart of a method for mapping pilot patterns of reference signals provided by an embodiment of the present application.

As shown in FIG. 4, the method may include steps S101-S105. in:

S101. The electronic device 200 establishes a connection with the electronic device 100 .

The electronic device 200 and the electronic device 100 may establish connections based on various wireless communication technologies. Exemplarily, the electronic device 200 and the electronic device 100 may establish a D2D connection.

When the electronic device 200 and the electronic device 100 perform D2D communication under partial cellular network coverage, the base station controls the process of establishing a D2D connection between the two electronic devices. Both the electronic device 200 and the electronic device 100 can act as initiators to initiate a D2D connection. Taking the electronic device 200 as an example to initiate a D2D connection, specifically: the electronic device 200 can send a request signal to the base station, and the request signal is used to request a connection with a nearby device that supports D2D communication. Electronic device pairing. After receiving the above request signal, the base station may send a pairing signal to electronic devices supporting D2D communication near the electronic device 200 , where the pairing signal includes the identification of the electronic device 200 . After receiving the pairing signal, the electronic device 100 may establish a D2D connection with the electronic device 200 based on an IP detection method or a D2D dedicated signaling method.

When the electronic device 200 and the electronic device 100 perform D2D communication without cellular network coverage, the process of establishing a D2D connection is completed independently by the two electronic devices. Both the electronic device 200 and the electronic device 100 can serve as initiators to initiate a D2D connection. Taking the electronic device 200 as an example to initiate a D2D connection, specifically: the electronic device 200 can send a request signal to the outside world. The request signal includes the identification of the electronic device 200, and the request signal Used to request pairing with nearby electronic devices that support D2D communication. After receiving the above request signal, the electronic device 100 may send a return signal to the electronic device 200 , so that the electronic device 200 establishes a D2D connection with the electronic device 100 .

S102. The electronic device 200 sends the pilot pattern mapping manner of the first reference signal to the electronic device 100 .

The pilot pattern mapping manner of the first reference signal sent by the electronic device 200 to the electronic device 100 is generated by the electronic device 100 . The pilot pattern mapping manner of the first reference signal may be represented by a pilot pattern. The pilot pattern is a pattern displayed on a coordinate axis where the abscissa is the time domain and the ordinate is the frequency domain. When the electronic device 200 communicates with the electronic device 100 based on OFDM technology, the electronic device 200 can convert the information to be transmitted to the electronic device 100 into multiple low-speed sub-data streams, modulate them onto multiple orthogonal sub-carriers for parallel transmission, The manner in which the above information occupies subcarriers in the OFDM symbol can be presented through a pilot pattern.

The foregoing pilot pattern indicates that the first reference signal occupies subcarriers in a pseudo-random manner within the OFDM symbol. Pseudorandom is the process of generating sequences with random properties based on a deterministic algorithm. In the embodiment of the present application, the number of OFDM symbols occupied by the first reference signal is determined by the electronic device 200 by itself. Since the first reference signal occupies subcarriers in a pseudo-random manner within the OFDM symbol, the sidelobe interference of the first reference signal during transmission will be suppressed. Therefore, even when the number of OFDM symbols occupied by the first reference signal is small, the electronic device 100 can accurately obtain the relevant information of the first reference signal, and position itself according to the relevant information of the first reference signal .

The electronic device 100 may also know the pilot pattern mapping manner of the first reference signal through other means. In some embodiments, manufacturers of the first device and the second device set and store the first pilot pattern mapping method in the first device and the second device. In some embodiments, the first device and the second device may also jointly determine the first pilot pattern mapping method through negotiation

S103. The electronic device 200 sends the first reference signal to the electronic device 100 .

The first reference signal is a signal generated by the electronic device 200 and sent by the electronic device 200 to the electronic device 100 based on OFDM technology. The process of the electronic device 200 generating the first reference signal includes the electronic device 200 determining the manner in which the first reference signal occupies subcarriers in the OFDM symbol, and the electronic device 200 determining the signal carried by each subcarrier occupied by the first reference signal.

The first reference signal is generated according to a positioning reference sequence, and the positioning reference sequence is a pseudo-random sequence. The method for the electronic device 200 to generate the positioning reference sequence is as follows:

The positioning reference sequence can be generated based on a pseudo-random sequence, such as: m-sequence, gold sequence, etc. Exemplarily, the positioning reference sequence is generated by m-sequence, specifically:

c(n)=(x ₁ (n+N _C )+x ₂ (n+N _C ))mod 2

Wherein, c(n) is a positioning reference sequence, x ₁ (n) and x ₂ (n) are two m-sequences, and N _c is a fixed preset value.

Taking the value of N _c as 31 as an example, for example, the calculation process of x ₁ (n+N _C ) and x ₂ (n+N _C ) is as follows:

x ₁ (n+31)＝(x ₁ (n+3)+x ₁ (n)) mod 2

x ₂ (n+31)＝(x ₂ (n+3)+x ₂ (n+2)+x ₂ (n+1)+x ₂ (n)) mod 2

Exemplarily, the positioning reference sequence in bit sequence form generated according to the above formula is as follows:

c(m)＝[0 0 1 0 0 0 1 1 1 0 1 1 0 1 0 0] (1)

The positioning reference signal can be generated by modulating c(m). For example, take the modulation mode of QPSK as an example:

The r(m) sequence is the first reference signal, the way r(m) is mapped to the physical resource in the frequency domain is the pilot pattern mapping way, and r(m) is the mth modulation symbol in the r(m) sequence. c(2m) and c(2m+1) are positioning reference sequences in the form of binary bit sequences. The sequence length of r(m) is half of the sequence length of c(m). r(m) is the mth modulation symbol in the r(m) sequence.

The information carried by the k(m)th orthogonal subcarrier in the OFDM symbol sent by the electronic device 200 to the electronic device 100 is a _k(m) , and a _k(m) can be generated by the following formula:

a _k(m) = βr(m)

Among them, β is a power scaling factor, and r(m) is a frequency-domain mapping symbol sequence.

In the kth OFDM symbol, the sequence number m of any subcarrier occupied by the first reference signal may correspond to the sequence number k(m) of an orthogonal subcarrier. k(m) indicates the manner in which the first reference signal occupies subcarriers. Since the first reference signal occupies subcarriers in a pseudo-random manner within the OFDM symbol, the sequence number m of the mth symbol of any first reference signal and the sequence number k(m) of the subcarrier of the OFDM symbol it occupies With a pseudo-random mapping relationship, the sequence numbers of subcarriers occupied by the first reference signal in all orthogonal subcarriers K={k(1),k(2),...,k(M)}, 1≤m≤ M, K are pseudo-random sequences. The value of k(1) is set by the electronic device 200 itself, for example, the value of k(1) may be 0.

Since P is a pseudo-random sequence, and the value of k(m) is the sequence number of the orthogonal subcarrier occupied by the m-1th modulation symbol of the first reference signal, and, the m-1th modulation symbol of the first reference signal The sum of the intervals between the sequence numbers of the occupied orthogonal subcarriers and the sequence numbers of the orthogonal subcarriers occupied by the mth modulation symbol of the first reference signal, therefore, K is related to the pseudo-random sequence.

It is easy to understand that if the electronic device 200 determines the subcarrier spacing sequence p(m) in an OFDM symbol, k(m) can be obtained according to the subcarrier spacing sequence p(m), so as to determine the first reference signal in the The method of occupying subcarriers in an OFDM symbol. Wherein, p(m) is the difference between the serial number of the subcarrier occupied by the mth modulation symbol of the first reference signal and the subcarrier occupied by the m+1th modulation symbol. Exemplarily, if p(1)=2 and k(1)=0 in one OFDM symbol, then k(2)=k(1)+p(1)=2.

The subcarrier spacing sequence p(m) having a pseudo-random property can be generated based on a pseudo-random sequence, such as m-sequence, gold sequence, and the like. Exemplarily, the method for the electronic device 200 to generate the subcarrier spacing sequence P is as follows:

p(m)=f _scaler *sum(2*c(2m)+c(2m+1))+d (2)

or

p(m)＝f _scaler *sum(2*c(2m)+c(2m+1)+d)

or

p(m)=f _scaler *sum(2*c(2m+1)+c(2m))+d

or

p(m)=f _scaler *sum(2*c(2m+1)+c(2m)+d)

Wherein, d is a fixed preset value, f _scaler is a scaling factor, f _scaler is a positive integer, and the values of d and f _scaler are set by the electronic device 200 itself.

In the following, the electronic device 200 generates the subcarrier spacing sequence P according to the formula (2) as an example, and specifically introduces the embodiment of the present application.

Since the positioning reference sequence carried by the first reference signal is a pseudo-random sequence, the pseudo-random sequence based on which the subcarrier spacing sequence P is generated may be a positioning reference sequence. The pilot pattern of the first reference signal is used to indicate the frequency domain mapping manner of the first reference signal. Because the pilot pattern of the first reference signal is associated with the positioning reference sequence carried by the first reference signal. Therefore, when the electronic device 200 sends the pilot pattern of the first reference signal to the electronic device 100, it does not need to additionally send other information for generating the pilot pattern to the electronic device 100, reducing the cost of sending the first reference signal by the electronic device 200. The required pilot pattern indicates signaling overhead.

In the following, the embodiment of the present application will be specifically introduced by taking the pseudo-random sequence based on which the subcarrier spacing sequence P is generated is a positioning reference sequence as an example.

In some embodiments, the positioning reference sequence bit sequence is (1), the value of f _scaler is 1, the value of d is 2, and the value of k(0) is 0, and the electronic device 200 generates according to formula (2) The subcarrier spacing sequence P of is as follows:

P＝[2 4 2 5 4 5 3 2]

Afterwards, the electronic device 200 determines according to the subcarrier spacing sequence P as follows:

K=[0,2,6,8,13,17,22,25,27]

Thus, the electronic device 200 determines the manner in which the first reference signal occupies subcarriers in the OFDM symbol. The electronic device 200 can determine the number of OFDM symbols occupied by the first reference signal by itself. Exemplarily, the first reference signal occupies one or four OFDM symbols. FIG. 5A shows that the first reference signal occupies one OFDM symbol, and, the first A pilot pattern of the first reference signal when the reference signal occupies four OFDM symbols.

By implementing the method, since the first reference signal occupies subcarriers in a pseudo-random manner within the OFDM symbol, the sidelobe interference of the first reference signal during transmission will be suppressed. Therefore, even when the number of OFDM symbols occupied by the first reference signal is small, the electronic device 100 can accurately obtain the relevant information of the first reference signal, and position itself according to the relevant information of the first reference signal .

In other embodiments, the positioning reference sequence bit sequence is (1), the value of f _scaler is the number of OFDM symbols occupied by the first reference signal, the value of d is 2, and the value of k(1) is 0. The electronic device 200 can determine the number of OFDM symbols occupied by the first reference signal by itself. For example, when the first reference signal occupies two OFDM symbols, the subcarrier spacing sequence P generated by the electronic device 200 according to formula (2) is as follows:

P＝[2 6 2 8 6 8 4 2]

The K determined by the electronic device 200 according to the subcarrier spacing sequence P is as follows:

K=[0,2,9,11,19,25,33,37,39]

Thus, the electronic device 200 determines the manner in which the first reference signal occupies subcarriers in the OFDM symbol. The electronic device 200 can determine the number of OFDM symbols occupied by the first reference signal by itself. For example, the first reference signal occupies two OFDM symbols. FIG. 5B shows the number of OFDM symbols occupied by the first reference signal when the first reference signal occupies two OFDM symbols. pilot pattern. It is easy to understand that in this pilot pattern, the subcarrier spacing occupied by the first reference signal in the OFDM symbol is related to the number of OFDM symbols occupied by the first reference signal. When the number of OFDM symbols occupied by the first reference signal increases, the OFDM symbol The subcarrier spacing occupied by the first reference signal is also multiplied.

By implementing the method, the interval in the frequency domain can be further thinned, and the receiving end performs joint processing based on multiple positioning reference symbols. Under the condition of ensuring the same power in the time domain, the power of the occupied subcarriers in the frequency domain can be further increased, the signal-to-noise ratio can be improved, and the influence of noise can be suppressed.

In some other embodiments, the first reference signal may occupy multiple OFDM symbols, for example, the first reference signal occupies four OFDM symbols. The positioning reference sequence bit sequence is (1), the value of f _scaler is 1, and the value of d is 2. For different OFDM symbols, the value of k(1) can be different, for example, k(1)={0,2,1,3}, the offset of the first OFDM symbol occupied by the first reference signal is 0 , the offset of the second OFDM symbol occupied by the first reference signal is 2, the offset of the third OFDM symbol occupied by the first reference signal is 1, and the offset of the fourth OFDM symbol occupied by the first reference signal is 3. k(1)=d(i), i is a positive integer, and 1≤i≤4. The subcarrier spacing sequence P generated by the electronic device 200 according to formula (2) is as follows:

P＝[2 4 2 5 4 5 3 2]

The K corresponding to the ith OFDM symbol determined by the electronic device 200 according to the subcarrier spacing sequence P is as follows:

K=[0,2,6,8,13,17,22,25,27]+k(1)

Thus, the electronic device 200 determines the manner in which the first reference signal occupies subcarriers in the OFDM symbol. Fig. 5C shows the pilot pattern of the first reference signal. In the pilot pattern, subcarriers occupied by the first reference signal are offset between different OFDM symbols.

If the first reference signal occupies multiple OFDM symbols, and the first reference signals occupy subcarriers in the same manner in the OFDM symbols, the electronic device 100 may lose channel information of some frequency points when receiving the first reference signal. To implement the method, the position of the first subcarrier occupied by the first reference signal in the i-th OFDM symbol is in the ith OFDM symbol, and the position of the first sub-carrier occupied by the first reference signal in the j-th OFDM symbol is When the positions of subcarriers in the jth OFDM symbol are different, the frequency domain mapping of different OFDM symbols can complement each other, reducing the frequency domain blank situation, improving channel measurement accuracy and randomization of noise interference, and improving system positioning performance .

In some other embodiments, the first reference signal may occupy multiple OFDM symbols, and the multiple OFDM symbols are discontinuous in the time domain. For the process of generating the subcarrier spacing sequence P and the sequence K by the electronic device 200, reference may be made to the relevant descriptions in the foregoing embodiments.

FIG. 5D(1) and FIG. 5D(2) show pilot patterns of the first reference signal when the first reference signal occupies multiple discontinuous OFDM symbols in the time domain. Wherein, in FIG. 5D(1), the first reference signal occupies multiple discontinuous OFDM symbols in the time domain, and the multiple OFDM symbols occupy subcarriers in the same way. In Fig. 5D(2), the first reference signal occupies a plurality of discontinuous OFDM symbols in the time domain, and the subcarriers occupied in each OFDM symbol are offset.

To implement this method, when the first reference signal occupies multiple OFDM symbols that are discontinuous in the time domain, the electronic device 200 will discontinuously send the first reference signal. The electronic device 200 may perform antenna switching between sending the first reference signal, and use different antennas to send different OFDM symbols. In this way, the space diversity gain of the system can be improved, and the influence of system hardware factors on the transmission of the first reference signal can be reduced. In addition, different OFDM symbols are sent independently, which can reduce the impact of continuous system errors. The receiving end uses the symbols of each reference signal to independently perform channel measurement, and then combine them to improve system performance.

In some embodiments, the electronic device 200 can respectively establish a D2D connection with the electronic device 100 and the third device, and time division multiplexing can be implemented between the electronic device 100 and the third device, and the time division multiplexing can be cross multiplexing or continuous Symbol reuse. Wherein, when the time division multiplexing implemented by the electronic device 100 and the third device is cross multiplexing, the electronic device 100 and the third device may take turns occupying one OFDM symbol for information transmission. When the time division multiplexing implemented by the electronic device 100 and the third device is continuous symbol multiplexing, the electronic device 100 and the third device may perform information transmission with the electronic device 200 in sequence. The electronic device 200 may send the pilot pattern of the first reference signal to the electronic device 100, and send the pilot pattern of the second reference signal to the third device. The pilot patterns of the first reference signal and the second reference signal both indicate that the first reference signal occupies subcarriers in a pseudo-random manner within the OFDM symbol, and the OFDM symbols occupied by the first reference signal are different from the OFDM symbols occupied by the second reference signal .

When the pilot pattern of the first reference signal and the pilot pattern of the second reference signal are presented on a time-frequency two-dimensional coordinate axis, they can be realized as the pilot patterns shown in FIG. 5E(1) and FIG. 5E(2).

By implementing this method, time division multiplexing between the electronic device 100 and the third device can be realized, the capacity of the communication system is improved, and more users are supported to simultaneously access the network for mutual positioning. In addition, if the way of cross-multiplexing is used, the diversity gain of the system can be utilized. If continuous symbol multiplexing is used, multi-symbol joint estimation can be enabled to improve correlation gain.

Thus, the electronic device 200 can generate the first reference signal. Afterwards, the electronic device 200 may send the first reference signal to the electronic device 100 based on the D2D connection established between the electronic device 200 and the electronic device 100 .

(Optional step) S104. The electronic device 100 receives the first reference signal sent by the electronic device 200 according to the pilot pattern of the first reference signal, and acquires relevant information of the first reference signal.

The electronic device 100 may receive the first reference signal sent by the electronic device 200 according to the pilot pattern of the first reference signal, and process the first reference signal to obtain related information of the first reference signal. The relevant information of the first reference signal includes any one or more of the following: the time of sending the first reference signal carried by the first reference signal, the time of receiving the first reference signal, the field strength of the first reference signal, or the first reference signal The angle of incidence of the signal.

Wherein: the time of sending the first reference signal carried by the first reference signal and the time of receiving the first reference signal can be used to determine the distance between the electronic device 100 and the electronic device 200 . The distance between the electronic device 100 and the electronic device 200 can be obtained based on the TOA pilot pattern mapping method. Specifically, the time difference between the time of sending the first reference signal carried by the first reference signal and the time of receiving the first reference signal is the propagation time of the first reference signal. The distance between the electronic device 100 and the electronic device 200 is equal to the product of the propagation time of the first reference signal and the speed of light.

The field strength of the first reference signal can be used to determine the distance between the electronic device 100 and the electronic device 200 . The field strength of the first reference signal includes the field strength of the first reference signal sent by the electronic device 200 carried in the first reference signal, and the field strength of the first reference signal received by the electronic device 100 . Specifically, according to the field strength of the first reference signal sent by the electronic device 200 carried by the first reference signal, the field strength of the first reference signal received by the electronic device 100, and the channel fading model, the relationship between the electronic device 100 and the electronic device can be obtained. The distance between 200.

The incident angle of the first reference signal can be used to determine the direction angle of the electronic device 100 relative to the electronic device 200 .

In some embodiments, step S104 is optional.

(Optional step) S105. The electronic device 100 determines the absolute position of the electronic device 100 according to the relevant information of the first reference signal, or the position of the electronic device 100 relative to the electronic device 200 .

The electronic device 100 can determine the absolute position of the electronic device 100 or the position of the electronic device 100 relative to the electronic device 200 according to the relevant information of the first reference signal.

The relative position of the electronic device 100 relative to the electronic device 200 includes the distance between the electronic device 100 and the electronic device 200 , and the direction angle of the electronic device 100 relative to the electronic device 200 . In some embodiments, the electronic device 100 can calculate and obtain the electronic device 100 and electronic The distance between devices 200. The electronic device 100 may determine the direction angle of the electronic device 100 relative to the electronic device 200 according to the incident angle of the first reference signal. Afterwards, the electronic device 100 may determine the relative position of the electronic device 100 relative to the electronic device 200 according to the distance between the electronic device 100 and the electronic device 200 and the direction angle of the electronic device 100 relative to the electronic device 200 .

The electronic device 100 can determine the absolute position of the electronic device 100 according to the relevant information of the first reference signal. In some embodiments, the electronic device 100 may receive the first reference signal sent by the RSU as shown in FIG. 2B , and acquire information about the first reference signal. The electronic device 100 may process information related to the first reference signal to obtain a relative position of the electronic device 100 relative to the RSU. Afterwards, the electronic device 100 can determine the absolute position of the electronic device 100 according to the relative position of the electronic device 100 to the RSU and the absolute position of the RSU. In some other embodiments, the electronic device 100 may receive first reference signals sent by three or more RSUs as shown in FIG. 2B , and acquire information about the first reference signals. The electronic device 100 may process the relevant information of the first reference signal to obtain the distance between the electronic device 100 and each RSU. Afterwards, the electronic device 100 may determine the absolute position of the electronic device 100 according to the distance between the electronic device 100 and each RSU.

In some embodiments, step S105 is optional.

Steps S101 to S105 provide a pilot pattern mapping method for a reference signal. The first device can generate a first reference signal. The first pilot pattern mapping method used by the first reference signal is a pseudo-random method. The first pilot The pattern mapping manner indicates the manner in which the first reference signal occupies the OFDM subcarrier in the frequency domain. The first device may send the first reference signal according to the first pilot pattern mapping manner. By implementing the method, the sidelobe interference received by the first reference signal during transmission can be suppressed, the time measurement accuracy based on the first reference signal can be improved, and the positioning accuracy can be further improved.

As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: it can still understand the foregoing The technical solutions described in each embodiment are modified, or some of the technical features are replaced equivalently; and these modifications or replacements do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the various embodiments of the application.

Claims

A method for mapping a pilot pattern of a reference signal, wherein the method is applied to a first device, and the method includes:

The first device generates a first reference signal, a first pilot pattern mapping method adopted by the first reference signal is generated according to a first pseudo-random sequence, and the first pilot pattern mapping method indicates the first reference signal The way of occupying OFDM subcarriers in the frequency domain;

The first device sends the first reference signal according to the first pilot pattern mapping manner.
The method according to claim 1, wherein the first pseudo-random sequence is an m-sequence or a Gold sequence.
The method according to claim 1 or 2, wherein the first pilot pattern mapping method adopted by the first reference signal is generated according to the first pseudo-random sequence comprising:

The first reference signal occupies one or more OFDM symbols, and the interval between the subcarrier occupied by the mth modulation symbol of the first reference signal and the subcarrier occupied by the m+1th modulation symbol is p(m), The m is a positive integer, and the p(m) is generated according to the first pseudo-random sequence.
The method according to any one of claims 1-3, wherein the first reference signal is determined by a second pseudo-random sequence, and the first pseudo-random sequence is correlated with the second pseudo-random sequence or the same.
The method according to any one of claims 1-4, wherein the first pilot pattern mapping manner is generated according to the number of OFDM symbols occupied by the first reference signal.
The method according to any one of claims 1-5, wherein the first reference signal occupies a plurality of OFDM symbols in the frequency domain, and the starting subcarriers of the plurality of OFDM symbols occupied by the first reference signal There is a bias in the position.
The method according to claim 6, wherein the positions of the starting subcarriers of the plurality of OFDM symbols occupied by the first reference signal are offset comprising:

The first reference signal occupies N OFDM symbols, the position of the first subcarrier occupied by the first reference signal in the ith OFDM symbol in the ith OFDM symbol, and, the first The position of the first subcarrier occupied by the reference signal in the jth OFDM symbol is the same or different in the jth OFDM symbol, and i and j are positive integers less than or equal to N and not the same.
The method according to any one of claims 1-7, wherein the first reference signal occupies a plurality of continuous or discontinuous OFDM symbols in the time domain.
The method according to any one of claims 1-8, wherein the method further comprises:

The first device generates a second reference signal, the second pilot pattern mapping manner indicates the manner in which the second reference signal occupies an OFDM subcarrier in the frequency domain, and the OFDM symbol occupied by the second reference signal in the frequency domain is identical to the OFDM subcarrier occupied by the second reference signal. OFDM symbols occupied by the first reference signal in the frequency domain are different;

The first device sends the second reference signal according to a second pilot pattern mapping manner, the first reference signal and the second reference signal are both sent within a first time period, and the first time period is less than threshold.
The method according to any one of claims 1-9, wherein the first reference signal is used for the second device to receive according to the first pilot pattern mapping manner, and to use the first reference signal according to the first reference The relevant information of the signal determines the absolute position of the second device, or the position of the second device relative to the first device.
The method according to claim 10, wherein the relevant information of the first reference signal includes any one or more of the following: the time of sending the first reference signal carried by the first reference signal, the time of receiving the first reference signal The time of the first reference signal, the field strength of the first reference signal, or the incident angle of the first reference signal.
The method according to any one of claims 1-11, wherein the first device includes a car machine, a mobile phone, and a roadside unit (RSU).
A method for mapping a pilot pattern of a reference signal, wherein the method is applied to a second device, and the method includes:

The second device receives the first reference signal, the first pilot pattern mapping method adopted by the first reference signal is generated according to a first pseudo-random sequence, and the first pilot pattern mapping method indicates the first The manner in which the reference signal occupies OFDM subcarriers in the frequency domain.
The method according to claim 13, wherein the first pseudo-random sequence is an m-sequence or a Gold sequence.
The method according to claim 13 or 14, wherein the first pilot pattern mapping method adopted by the first reference signal is generated according to the first pseudo-random sequence comprising:

The first reference signal occupies one or more OFDM symbols, and the interval between the subcarrier occupied by the mth modulation symbol of the first reference signal and the subcarrier occupied by the m+1th modulation symbol is p(m), The m is a positive integer, and the p(m) is generated according to the first pseudo-random sequence.
The method according to any one of claims 13-15, wherein the first reference signal is determined by a second pseudo-random sequence, and the first pseudo-random sequence is correlated with the second pseudo-random sequence or the same.
The method according to any one of claims 13-16, wherein the first pilot pattern mapping manner is generated according to the number of OFDM symbols occupied by the first reference signal.
The method according to any one of claims 13-17, wherein the first reference signal occupies a plurality of OFDM symbols in the frequency domain, and the starting subcarriers of the plurality of OFDM symbols occupied by the first reference signal There is a bias in the position.
The method according to claim 18, wherein the positions of the starting subcarriers of the plurality of OFDM symbols occupied by the first reference signal are offset comprising:

The first reference signal occupies N OFDM symbols, the position of the first subcarrier occupied by the first reference signal in the ith OFDM symbol in the ith OFDM symbol, and, the first The position of the first subcarrier occupied by the reference signal in the j th OFDM symbol is the same or different in the j th OFDM symbol, and i and j are positive integers less than or equal to N and not the same.
The method according to any one of claims 13-19, wherein the first reference signal occupies a plurality of continuous or discontinuous OFDM symbols in the time domain.
The method according to any one of claims 13-20, wherein the method further comprises:

The second device determines the absolute position of the second device, or the position of the second device relative to the first device, according to the relevant information of the first reference signal.
The method according to claim 21, wherein the relevant information of the first reference signal includes any one or more of the following: the time of sending the first reference signal carried by the first reference signal, the time of receiving the first reference signal The time of the first reference signal, the field strength of the first reference signal, or the incident angle of the first reference signal.
The method according to any one of claims 13-22, wherein the second device includes a car machine or a mobile phone.
An electronic device, characterized in that the electronic device includes a memory and a processor, the memory is used to store a computer program, and the processor is used to call the computer program, so that the electronic device executes claims 1-12, or , the steps performed by the first device or the second device in any one of claims 13-23.
A computer program product containing instructions, characterized in that, when the computer program product runs on an electronic device, the electronic device executes any one of claims 1-12, or any one of claims 13-23. described method.
A computer-readable storage medium, comprising instructions, wherein, when the instructions are run on an electronic device, the electronic device executes any one of claims 1-12, or any one of claims 13-23 the method described.