WO2020238573A1 - Procédé et appareil de traitement de signaux - Google Patents

Procédé et appareil de traitement de signaux Download PDF

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Publication number
WO2020238573A1
WO2020238573A1 PCT/CN2020/088919 CN2020088919W WO2020238573A1 WO 2020238573 A1 WO2020238573 A1 WO 2020238573A1 CN 2020088919 W CN2020088919 W CN 2020088919W WO 2020238573 A1 WO2020238573 A1 WO 2020238573A1
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WIPO (PCT)
Prior art keywords
pilot
indication information
pilot sequence
delay
doppler domain
Prior art date
Application number
PCT/CN2020/088919
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English (en)
Chinese (zh)
Inventor
马千里
陈磊
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华为技术有限公司
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Publication of WO2020238573A1 publication Critical patent/WO2020238573A1/fr

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L23/00—Apparatus or local circuits for systems other than those covered by groups H04L15/00 - H04L21/00
    • H04L23/02—Apparatus or local circuits for systems other than those covered by groups H04L15/00 - H04L21/00 adapted for orthogonal signalling
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2602—Signal structure
    • H04L27/261—Details of reference signals
    • H04L27/2613—Structure of the reference signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H04L27/262—Reduction thereof by selection of pilot symbols

Definitions

  • the embodiments of the present application relate to communication technologies, and in particular, to a signal processing method and device.
  • Orthogonal Time Frequency & Space (OTFS) technology is a new two-dimensional modulation technology. Its main technical feature is to place signals (for example: constellation symbols) in the newly created time delay-Doppler domain. Above, and through the two-dimensional dual Fourier transform and the traditional time-frequency domain equivalent transformation, and finally form the common code division multiple access (CDMA), time division multiple access (time division multiple access, TDMA) or frequency division multiple access (FDMA) waveform for transmission.
  • CDMA common code division multiple access
  • TDMA time division multiple access
  • FDMA frequency division multiple access
  • OTFS technology is especially suitable for high-speed moving scenes due to its newly expanded Doppler domain. For example: a highway scene with a speed of 120km/h, or a high-speed rail scene with a speed of 500km/h, etc.
  • the sending device can perform time delay-Doppler domain signal mapping on the data information and pilot information, map the data information and pilot information to the time delay-Doppler domain, and then perform the OTFS encoding operation to convert the time delay-Doppler domain.
  • the Le domain signal is mapped to the time-frequency domain, and then the dimension change processing is performed to generate the baseband waveform processing flow.
  • the modulated waveform is sent to the receiving device through the power amplifier. That is, OTFS technology moves the digital signal processing to the time delay-Doppler domain.
  • the time delay-Doppler domain is a two-dimensional orthogonal mapping of the time-frequency domain. Through two-dimensional orthogonal mapping, the time-frequency domain changing channel is energy-averaged in the time-delay-Doppler domain. Therefore, the equivalent channel in the delay-Doppler domain has stability, distinguishability and orthogonality of the delay-Doppler information compared with the channel in the time-frequency domain.
  • the sending device performs time-delay-Doppler-domain signal mapping and OTFS encoding operations on the data information and pilot information to obtain the time-domain signal
  • the time-domain signal will have a high impact, resulting in an excessively high peak-to-average value. Ratio, causing signal distortion.
  • the embodiments of the present application provide a signal processing method and device to reduce the peak-to-average ratio in the communication process, reduce signal distortion, and improve communication quality.
  • an embodiment of the present application provides a signal processing method.
  • the method may include: a sending device acquires a pilot sequence, the sending device maps the pilot sequence to a pilot region in the delay-Doppler domain, and the pilot The cyclic prefix of the sequence is mapped to the guard interval in the delay-Doppler domain, the data signal is mapped to the data area in the delay-Doppler domain, and the delay-Doppler domain signal is obtained, where the pilot sequence is located in the pilot For all lines in the frequency region, the sending device sends a transmission signal to the receiving device, and the transmission signal is obtained by processing the delay-Doppler domain signal.
  • the sending device maps the pilot sequence to all rows in the pilot region of the delay-Doppler domain, so that the energy of the pilot sequence is dispersed in the delay domain of the entire pilot region, which can avoid time delay.
  • the Doppler domain signal undergoes an OTFS encoding operation, there is an impact signal with higher energy, which can reduce the peak-to-average ratio during the communication between the sending device and the receiving device, reduce signal distortion, and improve communication quality.
  • the guard interval is the same as the last L row of the pilot area; L is greater than or equal to 1.
  • the delay-Doppler domain includes N*M resource units, where the pilot area may include k*m resource units, and the guard interval is the same as the last L rows and m columns of the pilot area.
  • the pilot sequences are located in the same column or different columns in the pilot area.
  • the pilot sequence may include k*n elements, n takes any value from 2 to m, and the resource unit that carries the k*n elements in the pilot region is located adjacent to or out of phase in the pilot region. In adjacent n columns.
  • the pilot sequence is located in adjacent or non-adjacent n columns of the pilot region, and the n is greater than 1.
  • the delay-Doppler domain may also include a protection area, the protection area is located between the pilot area and the data area, and the signal mapped to the protection area is 0.
  • the pilot area and the data area are separated by the protection area to prevent the pilot sequence of the pilot area from leaking into the data area after passing through the channel, and to eliminate the interference of the pilot sequence leakage in the data signal.
  • the method may further include: the sending device receives at least one of the following information: first indication information, where the first indication information is used to indicate that the pilot area is in the delay-Doppler Position in the domain; second indication information, the second indication information is used to indicate the location of the resource unit that carries the pilot sequence; third indication information, the third indication information is used to indicate the pilot sequence; or, the fourth indication The fourth indication information is used to indicate the position of the protection area in the delay-Doppler domain.
  • the position of the pilot region in the time delay-Doppler domain, the position of the resource unit carrying the pilot sequence, the pilot sequence, and the protection region can be flexibly and dynamically indicated by the above-mentioned at least one kind of indication information.
  • One or more of the positions in the extended-Doppler domain can be flexibly and dynamically indicated by the above-mentioned at least one kind of indication information.
  • the method may further include: the sending device sends at least one of the following information: first indication information, the first indication information is used to indicate that the pilot area is in the delay-Doppler Position in the domain; second indication information, the second indication information is used to indicate the location of the resource unit that carries the pilot sequence; third indication information, the third indication information is used to indicate the pilot sequence; or, fourth Indication information, where the fourth indication information is used to indicate the position of the protection area in the delay-Doppler domain.
  • first indication information the first indication information is used to indicate that the pilot area is in the delay-Doppler Position in the domain
  • second indication information the second indication information is used to indicate the location of the resource unit that carries the pilot sequence
  • third indication information the third indication information is used to indicate the pilot sequence
  • fourth Indication information where the fourth indication information is used to indicate the position of the protection area in the delay-Doppler domain.
  • an embodiment of the present application provides a signal processing method.
  • the method may include: a receiving device receives a transmission signal sent by a sending device, the transmission signal is obtained by processing a delay-Doppler domain signal, and the time
  • the extended-Doppler domain signal includes: a pilot region for mapping a pilot sequence, a guard interval for mapping a cyclic prefix of the pilot sequence, and a data region for mapping a data signal, and the pilot sequence is located in all parts of the pilot region.
  • the receiving device performs channel estimation based on the time delay-Doppler domain signal and the pilot sequence.
  • the guard interval is the same as the last L row of the pilot area; L is greater than or equal to 1.
  • the pilot sequences are located in the same column or different columns in the pilot area.
  • the pilot sequence is located in n adjacent or non-adjacent columns of the pilot area, and n is greater than 1.
  • the time delay-Doppler domain signal further includes a protection area where the mapping signal is 0, and the protection area is located between the pilot area and the data area.
  • the method may further include: the receiving device sends at least one of the following information: first indication information, the first indication information is used to indicate that the pilot area is in the delay-Doppler Position in the domain; second indication information, the second indication information is used to indicate the location of the resource unit that carries the pilot sequence; third indication information, the third indication information is used to indicate the pilot sequence; or, the fourth indication The fourth indication information is used to indicate the position of the protection area in the delay-Doppler domain.
  • the method may further include: the receiving device receives at least one of the following information: first indication information, the first indication information is used to indicate that the pilot area is in the delay-Doppler Position in the domain; second indication information, the second indication information is used to indicate the location of the resource unit that carries the pilot sequence; third indication information, the third indication information is used to indicate the pilot sequence; or, the fourth indication Information, the fourth indication information is used to indicate the position of the protection area in the delay-Doppler domain.
  • first indication information the first indication information is used to indicate that the pilot area is in the delay-Doppler Position in the domain
  • second indication information the second indication information is used to indicate the location of the resource unit that carries the pilot sequence
  • third indication information the third indication information is used to indicate the pilot sequence
  • fourth indication Information the fourth indication information is used to indicate the position of the protection area in the delay-Doppler domain.
  • an embodiment of the present application provides a wireless communication device, which may be a sending device or a chip in the sending device.
  • the device has the function of realizing the transmission equipment involved in the above embodiments. This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units corresponding to the above-mentioned functions.
  • the device when the device is a transmitting device, the device may include a processing module and a transceiver module.
  • the processing module may be a processor, for example, the transceiver module may be a transceiver, and the transceiver may include Radio frequency circuit and baseband circuit.
  • the device may further include a storage unit, and the storage unit may be a memory, for example.
  • the storage unit is used to store computer-executable instructions
  • the processing module is connected to the storage unit, and the processing module executes the computer-executable instructions stored in the storage unit, so that the sending device executes the aforementioned sending device Functional signal processing method.
  • the chip when the device is a chip in a sending device, the chip includes: a processing module and a transceiver module.
  • the processing module may be a processor, for example, and the transceiver module may be an input on the chip. /Output interface, pin or circuit, etc.
  • the apparatus may further include a storage unit, and the processing module can execute computer-executable instructions stored in the storage unit, so that the chip in the sending device executes any of the above-mentioned signal processing methods involving the function of the sending device.
  • the storage unit is a storage unit in the chip, such as a register, a cache, etc.
  • the storage unit may also be a storage unit located outside the chip in the sending device, such as a read-only memory (ROM for short) Or other types of static storage devices that can store static information and instructions, random access memory (RAM for short), etc.
  • ROM read-only memory
  • RAM random access memory
  • the processor mentioned in any of the above can be a general-purpose central processing unit (Central Processing Unit, CPU for short), microprocessor, application-specific integrated circuit (ASIC for short), or one or A plurality of integrated circuits used to control the program execution of the above-mentioned signal processing methods.
  • CPU Central Processing Unit
  • ASIC application-specific integrated circuit
  • this application provides a wireless communication device, which may be a receiving device or a chip in the receiving device.
  • the device has the function of realizing the above-mentioned various aspects related to the embodiments of the receiving device. This function can be realized by hardware, or by hardware executing corresponding software.
  • the hardware or software includes one or more units corresponding to the above-mentioned functions.
  • the device when the device is a receiving device, the device may include: a processing module and a transceiver module.
  • the processing module may be a processor, for example, the transceiver module may be a transceiver, and the transceiver includes The radio frequency circuit, optionally, the device further includes a storage unit, and the storage unit may be a memory, for example.
  • the storage unit is used to store computer-executable instructions
  • the processing module is connected to the storage unit, and the processing module executes the computer-executable instructions stored in the storage unit, so that the device executes any of the above aspects involving receiving The signal processing method of the equipment function.
  • the chip when the device is a chip in a receiving device, the chip includes a processing module and a transceiver module.
  • the processing module may be a processor, for example, and the transceiver module may be on the chip.
  • the processing module can execute the computer-executable instructions stored in the storage unit, so that the chip in the receiving device executes the above-mentioned signal processing methods involving the functions of the receiving device.
  • the storage unit is a storage unit in the chip, such as a register, a cache, etc., and the storage unit may also be a storage unit located outside the chip in the access point, such as a ROM or Other types of static storage devices, RAM, etc. that store static information and instructions.
  • the processor mentioned in any of the foregoing may be a CPU, a microprocessor, an ASIC, or one or more integrated circuits used to control the execution of the program of the foregoing signal processing method.
  • a computer storage medium is provided, and program code is stored in the computer storage medium, and the program code is used to instruct the execution of any one of the first aspect to the second aspect or any possible implementation manner thereof Method of instruction.
  • a processor configured to be coupled with a memory, and configured to execute any one of the foregoing first to second aspects or a method in any possible implementation manner thereof.
  • a computer program product containing instructions which when running on a computer, causes the computer to execute any one of the first to second aspects or the method in any possible implementation manner thereof.
  • a communication system which includes: a sending device in any possible implementation manner of the foregoing third aspect and a receiving device in any possible implementation manner of the fourth aspect.
  • the sending device obtains the pilot sequence
  • the sending device maps the pilot sequence to the pilot region of the delay-Doppler domain, and maps the cyclic prefix of the pilot sequence to the delay-
  • the guard interval of the Doppler domain maps the data signal to the data area of the time delay-Doppler domain to obtain the time delay-Doppler domain signal, where the pilot sequence is located in all rows of the pilot area
  • the sending device sends a transmission signal, which is obtained by processing the delay-Doppler domain signal, and the receiving device performs channel estimation according to the delay-Doppler domain signal and the pilot sequence, thereby realizing the transmission device and the receiver
  • the sending device maps the pilot sequence to all rows in the pilot area of the delay-Doppler domain, so that the energy of the pilot sequence is dispersed in the delay domain of the entire pilot area, which can avoid time delay.
  • FIG. 1 is a schematic diagram of an application scenario of an embodiment of the application
  • FIG. 2 is a schematic diagram of another application scenario of an embodiment of the application.
  • 3 is a schematic diagram of the mapping relationship between time delay-Doppler domain and time-frequency domain according to an embodiment of the application;
  • FIG. 4 is a flowchart of a signal processing method according to an embodiment of the application.
  • FIG. 5 is a schematic diagram of a delay-Doppler domain according to an embodiment of this application.
  • FIG. 6 is a schematic diagram of another delay-Doppler domain according to an embodiment of this application.
  • FIG. 7 is a schematic diagram of another delay-Doppler domain according to an embodiment of this application.
  • FIG. 8 is a schematic diagram of another delay-Doppler domain according to an embodiment of this application.
  • FIG. 9 is a schematic diagram of a pilot sequence placement method according to an embodiment of the application.
  • FIG. 10 is a schematic diagram of another pilot sequence placement method according to an embodiment of the application.
  • FIG. 11 is a schematic diagram of another pilot sequence placement method according to an embodiment of the application.
  • FIG. 12 is a schematic diagram of another pilot sequence placement method according to an embodiment of the application.
  • FIG. 13 is a schematic diagram of another pilot sequence placement method according to an embodiment of the application.
  • FIG. 14 is a schematic diagram of another pilot sequence placement method according to an embodiment of the application.
  • 15 is a schematic diagram of another pilot sequence placement method according to an embodiment of the application.
  • 16 is a schematic diagram of another pilot sequence placement method according to an embodiment of the application.
  • FIG. 17 is a schematic diagram of another pilot sequence placement method according to an embodiment of the application.
  • FIG. 18 is a schematic diagram of a signal processing method of a sending device according to an embodiment of the application.
  • FIG. 19 is a schematic diagram of a signal processing method of a receiving device according to an embodiment of the application.
  • FIG. 21 is a schematic structural diagram of a wireless communication device provided by an embodiment of this application.
  • 22 is a schematic structural diagram of another wireless communication device provided by an embodiment of this application.
  • FIG. 23 is a schematic structural diagram of another wireless communication device provided by an embodiment of this application.
  • FIG. 24 is a schematic structural diagram of another wireless communication device provided by an embodiment of this application.
  • the network equipment involved in this application refers to equipment that can communicate with terminal equipment.
  • the network device can be an access network device, a relay station, or an access point.
  • the network equipment can be a base transceiver station (BTS) in the Global System for Mobile Communications (GSM) or Code Division Multiple Access (CDMA) network, or it can be
  • the base station (NodeB, NB) in the Wideband Code Division Multiple Access (WCDMA) may also be the evolution base station (Evolutional NodeB, eNB or eNodeB) in the Long Term Evolution (LTE).
  • the network device may also be a wireless controller in a cloud radio access network (cloud radio access network, CRAN) scenario.
  • cloud radio access network cloud radio access network, CRAN
  • the network device may also be a network device in a 5G network or a network device in a public land mobile network (Public Land Mobile Network, PLMN) that will evolve in the future.
  • the network device can also be a wearable device or a vehicle-mounted device.
  • the terminal equipment involved in this application refers to a communication device with a communication function.
  • it may be a wireless communication device, an Internet of Things (IoT) device, a wearable device or a vehicle-mounted device, a mobile terminal, a customer premise equipment (Customer Premise Equipment, CPE), etc.
  • the mobile terminal may also be called User Equipment (User Equipment, UE for short), access terminal, user unit, user station, mobile station, mobile station, user terminal, terminal, wireless communication equipment, user agent, or user device.
  • IoT Internet of Things
  • CPE Customer Premise Equipment
  • the mobile terminal may also be called User Equipment (User Equipment, UE for short), access terminal, user unit, user station, mobile station, mobile station, user terminal, terminal, wireless communication equipment, user agent, or user device.
  • User Equipment User Equipment
  • the mobile terminal can be a smart phone, a cellular phone, a cordless phone, a tablet computer, a personal digital assistant (PDA) device, an IoT device with wireless communication function, a computing device, or other processing device connected to a wireless modem , In-vehicle equipment, wearable equipment, terminal equipment in 5G network or terminal equipment in the future evolved PLMN network, etc.
  • PDA personal digital assistant
  • FIG. 1 is a schematic diagram of an application scenario of an embodiment of the application.
  • the application scenario may include a sending device and a receiving device.
  • the sending device may be a terminal device of any form mentioned above, and correspondingly, the receiving device may be a network device of any form mentioned above.
  • the sending device may be a network device in any of the foregoing forms, and correspondingly, the receiving device may be a terminal device in any of the foregoing forms.
  • the sending device sends a transmission signal to the receiving device through the signal processing method of the present application, the transmission signal is obtained by processing the time delay-Doppler domain signal, and the receiving device receives the transmission signal according to the time delay-Doppler signal and
  • the pilot sequence is used for channel estimation, so as to realize the communication between the sending device and the receiving device.
  • the sending device maps the pilot sequence to all rows of the pilot region in the delay-Doppler domain, so that the energy of the pilot sequence is dispersed In the time delay domain of the entire pilot region, it can avoid the presence of high-energy impact signals after the time delay-Doppler domain signal undergoes OTFS encoding operation, which can reduce the peak-to-average ratio in the communication process, reduce signal distortion, and improve communication quality.
  • OTFS encoding operation
  • FIG. 2 is a schematic diagram of another application scenario of an embodiment of the application.
  • the application scenario is illustrated by taking a base station (BS) and three UEs as an example, where: The three UEs are UE0, UE1, and UE2.
  • UE0 can use the DFT-S-OFDM waveform modulation method used for uplink transmission in the LTE system to communicate with the BS.
  • UE0 can be used as a transmitting device, and the BS can be used as a receiving device.
  • the UE1 can use the OFDM waveform modulation method used for downlink transmission in the LTE system to communicate with the BS.
  • the UE1 can be used as a receiving device, and the BS can be used as a transmitting device.
  • UE2 can use the CDMA waveform modulation method to communicate with the BS.
  • the foregoing application scenarios may be high-speed communication scenarios, MTC communication scenarios, high-frequency large-bandwidth communication scenarios, and the like.
  • the waveform between the BS and the UE is only an example, the waveform can also be any other known waveforms, and different waveforms can be selected for different modulations.
  • the sending device of this application generates Delay-Doppler domain signals can be modulated with arbitrary waveforms.
  • the time delay-Doppler domain referred to in this application refers to a two-dimensional domain different from the time-frequency domain.
  • One dimension represents the time delay domain and the other dimension represents the Doppler domain.
  • the The time delay-Doppler domain can be represented by a D matrix of N*M.
  • the delay-Doppler domain may be composed of N*M resource units, and one resource unit occupies one grid of the delay domain and one grid of the Doppler domain.
  • a grid in the delay domain is a unit ⁇ in the delay domain, and ⁇ represents the interval of signals in the delay domain. The unit is seconds.
  • N is the number of grids in the delay domain.
  • ⁇ f is the subcarrier spacing of frequency.
  • the time delay domain grid represents an interval of ⁇ time, sending a message.
  • the time delay domain interval of the two-dimensional channel exhibited in the time delay-Doppler domain is the grid unit ⁇ time to send one message.
  • a grid of the Doppler domain is a Doppler domain unit v
  • v represents the interval of Doppler domain signals
  • the unit is Hz, which characterizes the interval of Doppler domain signals. That is, the Doppler grid represents a frequency interval separated by v, and a message is sent.
  • the Doppler domain interval of the two-dimensional channel exhibited in the time delay-Doppler domain is the grid unit v frequency to send one message.
  • FIG. 3 is a schematic diagram of the mapping relationship between the delay-Doppler domain and the time-frequency domain according to an embodiment of the application.
  • the time The delay domain can be mapped to the frequency domain
  • the Doppler domain can be mapped to the time domain.
  • the time delay-Doppler domain signal in the embodiment of the present application can be converted into a time-frequency domain signal
  • the time-frequency domain signal is also Can be converted into time delay-Doppler domain signal.
  • the physical meaning of a signal at any point (for example, (n, m)) in the time-frequency domain signal is a signal on the nth frequency domain in the mth unit time.
  • M and N can take any values.
  • M can be a multiple of 2
  • N can be a multiple of 14.
  • Fig. 4 is a flowchart of a signal processing method according to an embodiment of the application. As shown in Fig. 4, this embodiment relates to a sending device and a receiving device. The method of this embodiment may include:
  • Step 101 The sending device obtains a pilot sequence.
  • the pilot sequence is used by the receiving device for channel estimation.
  • the pilot sequence may include any one of a ZC sequence, any column vector of a unitary matrix, a pi/2-BPSK sequence or a pi/4-QPSK sequence, and it may also be other sequences, which will not be illustrated here. .
  • the pilot sequence can be preset or configured by network equipment, which can be flexibly set according to requirements.
  • the sending device is a terminal device, and the pilot sequence obtained by the terminal device may be preset or configured by a network device.
  • Step 102 The sending device maps the pilot sequence to the pilot region of the delay-Doppler domain, maps the cyclic prefix of the pilot sequence to the guard interval of the delay-Doppler domain, and maps the data signal to the delay -Doppler domain data area to obtain time delay-Doppler domain signals.
  • the pilot sequence is located in all rows of the pilot region of the time delay-Doppler domain, so that the energy of the pilot sequence can be dispersed in the time delay domain of the entire pilot region.
  • the sending device may map the pilot sequence, the cyclic prefix of the pilot sequence, and the data signal into the time delay-Doppler domain as shown in FIG. 3.
  • This embodiment divides the time delay-Doppler domain into It is the data area, the pilot area and the guard interval, so that the data signal is mapped to the data area, the pilot sequence is mapped to the pilot area, and the cyclic prefix of the pilot sequence is mapped to the guard interval.
  • the time delay-Doppler domain shown in FIG. 3 can be a data area, a guard interval, a pilot area, and a data area from top to bottom.
  • the positions of the data area, pilot frequency area, and guard interval in the delay-Doppler domain can be flexibly set.
  • the guard interval can be set between the data area and the pilot area.
  • the delay-Doppler domain may include N*M resource units.
  • One dimension of the delay-Doppler domain represents time delay, and the other dimension represents Doppler.
  • the Le domain may include the data region, the guard interval, and the pilot region.
  • N and M are positive integers, and the transmitter may map different signals to different regions in the delay-Doppler domain.
  • the pilot area includes K*M resource units, and the sending device may map the pilot sequence to K rows of the pilot area.
  • the pilot sequence may include K elements.
  • the sending device maps the pilot sequence, the cyclic prefix of the pilot sequence, and the data signal into the delay-Doppler domain to obtain the delay-Doppler signal.
  • the sending device is a terminal device, and the terminal device can map the pilot sequence, the cyclic prefix of the pilot sequence, and the data signal into the delay-Doppler domain to obtain the delay-Doppler signal.
  • the sending device is a network device, and the network device can map the pilot sequence, the cyclic prefix of the pilot sequence, and the data signal into the delay-Doppler domain to obtain the delay-Doppler domain signal.
  • Step 103 The sending device sends a transmission signal to the receiving device, where the transmission signal is obtained by processing the delay-Doppler domain signal.
  • the receiving device receives the transmission signal sent by the sending device.
  • the sending device may convert the time delay-Doppler domain signal to convert the time delay-Doppler domain signal into a time-frequency domain signal. Then, the time-frequency domain signal is dimensionally transformed to obtain the time domain signal, and the time domain signal is processed by waveform modulation and other processing to obtain the transmission signal, and send the transmission signal to the receiving device.
  • the receiving device receives the transmission signal, and can obtain the time delay-Doppler domain signal according to the transmission signal. For example, the receiving device may perform processing such as waveform demodulation and time delay-Doppler domain conversion on the received transmission signal to obtain the time delay-Doppler domain signal.
  • Step 104 The receiving device performs channel estimation according to the time delay-Doppler domain signal and the pilot sequence.
  • the pilot sequence used by the receiving device for channel estimation is the same as the pilot sequence used by the sending device for signal processing.
  • the pilot sequence can be preset or configured by the network device, which can be based on requirements Make flexible settings.
  • the receiving device may use the delay-Doppler domain signal and the pilot sequence to perform channel estimation, obtain the equivalent channel in the delay-Doppler domain, and equalize the data signal in the data area according to the equivalent channel , Demodulation and other processing to recover the data signal sent by the sending device.
  • the sending device obtains the pilot sequence
  • the sending device maps the pilot sequence to the pilot region of the delay-Doppler domain, and maps the cyclic prefix of the pilot sequence to the guard interval of the delay-Doppler domain
  • the data signal is mapped to the data area of the time-delay Doppler domain to obtain the time-delay-Doppler domain signal, where the pilot sequence is located in all rows of the pilot area, and the transmitting device sends the transmission signal to the receiving device.
  • the signal is obtained by processing the delay-Doppler domain signal, and the receiving device performs channel estimation according to the delay-Doppler domain signal and the pilot sequence, so as to realize the communication between the sending device and the receiving device.
  • the pilot sequence is mapped to all rows in the pilot area of the delay-Doppler domain, so that the energy of the pilot sequence is dispersed in the delay domain of the entire pilot area, which can avoid the delay-Doppler domain signal passing through After the OTFS encoding operation, there is an impact signal with higher energy, which can reduce the peak-to-average ratio in the communication process, reduce signal distortion, and improve communication quality.
  • the pilot area and guard interval included in the time delay-Doppler domain can be set in different ways.
  • the guard interval is the same as the last L row of the pilot area; L is greater than or equal to 1.
  • the pilot area may include k*m resource units, and the guard interval is the same as the last L rows and m columns of the pilot area.
  • k is greater than L and less than N
  • m is less than or equal to M.
  • L may be greater than or equal to the delay-Doppler domain equivalent channel maximum multipath delay.
  • FIG. 5 is a schematic diagram of a delay-Doppler domain according to an embodiment of the application.
  • the delay-Doppler domain includes N*M resource units, and the pilot area It includes k*M resource units, and the guard interval includes L*M resource units.
  • the delay-Doppler domain consists of data area, guard interval, pilot area, and The number of resource units occupied by the data area, guard interval and pilot area is as described above.
  • the transmitting device can map the pilot sequence to the pilot area as shown in FIG. 5, map the cyclic prefix of the pilot sequence to the guard interval as shown in FIG. 5, and map the data signal to the data area as shown in FIG. 5 .
  • FIG. 6 is a schematic diagram of another delay-Doppler domain according to an embodiment of this application.
  • the delay-Doppler domain includes N*M resource units, where the pilot The area includes k*m resource units, the guard interval includes L*m resource units, and m is less than M.
  • the delay-Doppler domain is data area and guard interval from top to bottom. The number of resource units occupied by the pilot area and the data area, the guard interval and the pilot area is as described above. Since m is less than M, the data area surrounds the guard interval and the pilot area.
  • the sending device can map the pilot sequence to the pilot area as shown in FIG. 6, map the cyclic prefix of the pilot sequence to the guard interval as shown in FIG. 6, and map the data signal to the data area as shown in FIG. 6. .
  • the delay-Doppler domain may also include a protection area, the protection area is located between the pilot area and the data area, and the signals mapped by the protection area are all 0, which can also be understood as the protection area.
  • the signal on the resource unit is empty.
  • FIG. 7 is a schematic diagram of another delay-Doppler domain according to an embodiment of the application.
  • the delay-Doppler domain includes N*M resource units, where the pilot The area includes k*M resource units, the guard interval includes L*M resource units, and the protection area includes d*M resource units.
  • the delay-Doppler domain is sequentially from top to bottom.
  • the transmitting device can map the pilot sequence to the pilot area as shown in FIG. 7, map the cyclic prefix of the pilot sequence to the guard interval as shown in FIG.
  • the protection area separates the pilot area and the data area to prevent the pilot sequence in the pilot area from leaking into the data area after passing through the channel, and eliminate the pilot sequence leakage in the data signal Interference.
  • FIG. 8 is a schematic diagram of another delay-Doppler domain according to an embodiment of the application.
  • the delay-Doppler domain includes N*M resource units, among which, the guide The frequency area includes k*m resource units, the guard interval includes L*m resource units, and the protection area includes d*m resource units, and m is less than M.
  • the delay-Doppler domain From top to bottom, it is data area, guard interval, pilot area, protection area and data area.
  • the number of resource units occupied by guard interval, protection area and pilot area is as described above. Since m is less than M, data area It surrounds the guard interval, pilot area, and guard area.
  • the sending device can map the pilot sequence to the pilot area as shown in FIG. 8, map the cyclic prefix of the pilot sequence to the guard interval as shown in FIG. 8, and map the data signal to the data area as shown in FIG. 8. .
  • the protection area separates the pilot area and the data area to prevent the pilot sequence of the pilot area from leaking into the data area after passing through the channel, and eliminate the leakage of the pilot sequence in the data signal Interference.
  • the setting of the pilot sequence in the pilot region may be implemented in different ways.
  • the pilot sequence may be located in the same column or different columns of the pilot region in the delay-Doppler domain.
  • the pilot sequence may include k elements, and resource units carrying the k elements in the pilot region are located in the same column or different columns.
  • the number of rows of the pilot region in any of the time delay-Doppler domains in Figure 5 to Figure 8 above is k, and each grid of the pilot region carries one element, thereby dispersing the energy of the pilot sequence to On the time delay domain of the entire pilot frequency region.
  • FIG. 9 is a schematic diagram of a pilot sequence placement method according to an embodiment of the application.
  • the time delay-Doppler domain mapping of the pilot sequence may be as shown in FIG. 5.
  • Delay-Doppler domain that is, the delay-Doppler domain includes N*M resource units, where the pilot area includes k*M resource units, and the guard interval includes L*M resource units.
  • the above-mentioned pilot sequence may be mapped to a column of the pilot region, that is, the k elements of the pilot sequence are located in the same column.
  • the column where the pilot sequence shown in FIG. 9 is located is taken as an example. It can be understood that the pilot sequence may also be located in other columns, for example, any one of the first to Mth columns.
  • the cyclic prefix of the pilot sequence is mapped to the guard interval, as shown in Figure 9, the L to kth elements of the pilot sequence are mapped to the guard interval, and the L to kth elements of the pilot sequence in the guard interval
  • the column where the element is located is the same as the column where the pilot sequence of the pilot area is located.
  • FIG. 10 is a schematic diagram of another pilot sequence placement method according to an embodiment of the application.
  • the time delay-Doppler domain mapping of the pilot sequence may be as shown in FIG. 5.
  • Delay-Doppler domain that is, the delay-Doppler domain includes N*M resource units, where the pilot area includes k*M resource units, and the guard interval includes L*M resource units.
  • the example is different from the pilot sequence placement method shown in FIG. 9 in that the k elements of the pilot sequence are located in different columns. Take the pattern shown in FIG. 10 as an example for illustration. The first element is located in the pilot area. The first row, first column, and the second element are located in the second row and eighth column of the pilot area. The positions of other elements are shown in Figure 10. They are not explained here, that is, the k elements of the pilot sequence are distributed in In all rows of the pilot area, but in different columns.
  • FIG. 11 is a schematic diagram of another pilot sequence placement method according to an embodiment of the application.
  • the time delay-Doppler domain mapping of the pilot sequence may be as shown in FIG. 6
  • the time delay-Doppler domain and the immediate delay-Doppler domain include N*M resource units, where the pilot area includes k*m resource units, the guard interval includes L*m resource units, and m is less than M,
  • the above-mentioned pilot sequence can be mapped to a column of the pilot region, that is, the k elements of the pilot sequence are located in the same column.
  • the column where the pilot sequence shown in FIG. 11 is located is taken as an example. It can be understood that the pilot sequence may also be located in other columns, for example, the (Mm)/2th column to the (M+m)/2th column. Any one of the columns.
  • the cyclic prefix of the pilot sequence is mapped to the guard interval, as shown in Figure 11, the L to kth elements of the pilot sequence are mapped to the guard interval, and the L to kth elements of the pilot sequence in the guard interval
  • the column where the element is located is the same as the column where the pilot sequence of the pilot area is located.
  • FIG. 12 is a schematic diagram of another pilot sequence placement method according to an embodiment of the application.
  • the time delay-Doppler domain mapping of the pilot sequence may be as shown in FIG. 6
  • the mapping mode of the pilot sequence in the pilot region and guard interval of the time delay-Doppler domain shown in FIG. 6 is the same as the placement of the pilot sequence shown in FIG. 10, here No longer.
  • FIG. 13 is a schematic diagram of another pilot sequence placement method according to an embodiment of the application.
  • the time delay-Doppler domain mapping of the pilot sequence may be as shown in FIG. 7
  • the mapping mode of the pilot sequence in the pilot region and guard interval of the time delay-Doppler domain shown in Fig. 7 is the same as the placement mode of the pilot sequence shown in Fig. 9. Here No longer.
  • FIG. 14 is a schematic diagram of another pilot sequence placement method according to an embodiment of the application.
  • the time delay-Doppler domain mapping of the pilot sequence may be as shown in FIG. 7.
  • the mapping method of the pilot sequence in the pilot region and guard interval of the time delay-Doppler domain shown in FIG. 7 is the same as the placement of the pilot sequence shown in FIG. 10, here No longer.
  • FIG. 15 is a schematic diagram of another pilot sequence placement method according to an embodiment of the application.
  • the time delay-Doppler domain of the mapped pilot sequence can be set as shown in FIG. 8.
  • the mapping mode of the pilot sequence in the pilot region and guard interval of the time delay-Doppler domain shown in Figure 8 is the same as the placement of the pilot sequence shown in Figure 9. I won't repeat it here.
  • FIG. 16 is a schematic diagram of another pilot sequence placement method according to an embodiment of the application.
  • the time delay-Doppler domain mapping of the pilot sequence may be as shown in FIG. 8.
  • the mapping mode of the pilot sequence in the pilot region and guard interval of the time delay-Doppler domain shown in Fig. 8 is the same as that of the pilot sequence shown in Fig. 10. Here No longer.
  • the pilot sequence may be located in adjacent or different adjacent n columns of the pilot region, where n is greater than 1.
  • the pilot sequence may include k*n elements, n takes any value from 2 to m, and the resource unit carrying the k*n elements in the pilot region is located adjacent to or out of phase in the pilot region. In adjacent n columns.
  • FIG. 17 is another pilot sequence placement according to an embodiment of this application.
  • a schematic diagram of the method, as shown in Fig. 17, the time delay-Doppler domain of the mapping pilot sequence can be mapped to the time delay-Doppler domain shown in Fig. 5, and the k*M elements of the pilot sequence are distributed in In the entire pilot area, the elements in each column of the k*M elements may be the same, so that the pilot sequence is distributed in the entire pilot area.
  • the cyclic prefix of the pilot sequence is mapped to the guard interval, as shown in FIG. 17, the distribution of the cyclic prefix of the pilot sequence in the guard interval is the same as the distribution of the pilot sequence in the Lth to kth rows of the pilot region.
  • the signal processing method of the embodiment of the application maps the data signal and the pilot sequence to the time delay-Doppler domain, and performs equivalent transformation with the traditional time-frequency domain through precoding (for example, two-dimensional dual Fourier transform) , Forming the above arbitrary waveform (for example, TDMA) for transmission.
  • precoding for example, two-dimensional dual Fourier transform
  • TDMA arbitrary waveform
  • FIG. 18 is a schematic diagram of a signal processing method of a transmitting device according to an embodiment of the application.
  • the OTFS preprocessing module in the modem module of the transmitting device according to an embodiment of the application maps the data signal and the pilot sequence
  • the time delay-Doppler domain is obtained, the time delay-Doppler domain signal is coded by OTFS, the time-frequency domain signal is obtained, and the time-frequency domain signal is dimensionally transformed to obtain
  • the time domain signal is transmitted to the modulation module, and the modulation module performs waveform modulation to generate a baseband waveform. After the baseband waveform passes through the power amplifier, it is sent out through the antenna port to realize the transmission of the transmission signal.
  • FIG. 19 is a schematic diagram of a signal processing method of a receiving device according to an embodiment of the application.
  • the receiving device of an embodiment of the application receives a transmission signal through an antenna port, and the demodulation module demodulates the transmission signal.
  • the latter received symbols are passed to the OTFS processing module of the receiving device, and the OTFS performs dimensional transformation on the consecutive M received symbols to generate a two-dimensional equivalent signal with a size of N*M (also referred to as a time-frequency domain signal).
  • N*M also referred to as a time-frequency domain signal
  • OTFS decoding is performed on the time-frequency domain signal, and the decoding and the encoding of the transmitting device are an inverse transformation.
  • a time delay-Doppler domain signal For example, multiplying the conjugate matrix of an orthogonal basis matrix U1 to the left and multiplying the conjugate matrix of the orthogonal basis matrix U2 to the right to obtain a time delay-Doppler domain signal, which is a two-dimensional signal A signal of size N*M.
  • Channel estimation is performed on the equivalent channel in the delay-Doppler domain according to the placement mode of the pilot sequence and the pilot sequence agreed by the sending device and the receiving device.
  • the channel estimation result is used to equalize and demodulate the data signal in the time delay-Doppler domain to restore the data signal of the sending device.
  • the transmitting device selects a pilot sequence of length k, the pilot sequence itself has good autocorrelation properties, and one of the properties is that the pilot sequence is cyclically shifted with different lengths
  • the inner product is 0.
  • the ZC sequence used by the LTE pilot sequence or any column vector of a unitary matrix of k*k dimensions, etc.
  • a can be any value of 1:M. That is, 1 element is placed in each row, and k elements are placed in the pilot area. The energy of the pilot sequence is evenly distributed among the elements. Place the K-L+1:Kth row and ath column of the pilot sequence to the K'-L+1:K'th row and ath column of the guard interval. a can be any value of 1:M. K'is the total number of rows in the guard interval. L needs to meet the maximum multipath delay of the equivalent channel in the Doppler domain with a delay greater than or equal to.
  • the placement of the mapped pilot sequence can be as shown in FIG. 9.
  • the X:Yth row involved in this application specifically refers to the beginning of the Xth row and the end of the Yth row.
  • the pilot sequence is mapped to the 1:k row of the pilot area.
  • the column a specifically refers to mapping the pilot sequence to the 1st row to the kth row of the ath column of the pilot region.
  • the transmitting device After the mapping is completed, the transmitting device performs OTFS encoding on the time delay-Doppler domain signal.
  • a commonly used OTFS encoding representation is U1DU2 to obtain the equivalent signal in the time-frequency domain.
  • D is the time delay-Doppler domain signal.
  • the dimension of the signal is a matrix of N*M
  • U1 is an orthogonal basis matrix with a dimension of N ⁇ N
  • U2 is an orthogonal basis matrix with a dimension of M ⁇ M.
  • Orthogonal basis matrices can be selected arbitrarily, one of the most common orthogonal basis matrices is DFT/IDFT matrix.
  • the effect achieved by the OTFS encoding is to make the OTFS time delay-Doppler domain signal mapped to the time-frequency domain.
  • the transmitting device selects the OTFS-encoded signal for further time-domain signal generation according to the waveform of the transmitting device, and performs processing such as waveform modulation, and transmits the transmission signal through the antenna port. For example, dimensional transformation is performed on the OTFS encoded signal. Specifically, after the OTFS encoding is completed, a two-dimensional time-frequency domain signal with a dimension of N*M will be obtained. The N*M time-frequency domain signal will be The frequency domain signals of each unit time are arranged in sequence to generate the time domain signal before waveform modulation.
  • the modulation module performs waveform modulation to generate a baseband waveform. After the baseband waveform passes through the power amplifier, it is sent out through the antenna port, that is, the transmission of the transmission signal is realized.
  • the receiving device receives the transmission signal and performs processing methods such as demodulation, dimensional transformation, and OTFS decoding on the transmission signal as shown in Figure 19 to obtain a delay-Doppler domain signal based on the pilot frequency agreed upon by the sending device and the receiving device Sequence placement mode and pilot sequence.
  • the pilot sequence in this embodiment has autocorrelation properties (that is, the inner product of the cyclic shift is 0), and the receiving device can multiply the pilot cyclic shift in the time delay-Doppler domain signal.
  • the conjugate transposed matrix of the matrix to obtain the channel estimation result in column a, and use the channel estimation result in column a to equalize and demodulate the data signal in the delay-Doppler domain to restore the data signal of the sending device .
  • the pilot region in the delay-Doppler domain can be equivalent to the pilot sequence and the pilot region in the pilot region.
  • the cyclic convolution of the two-dimensional channel impulse response in the time delay-Doppler domain Take the time delay-Doppler domain 1: K row, the ath column as an example, the mathematical expression is as follows:
  • Is the received vector of the a-th column that is, the a-th column of the aforementioned time delay-Doppler domain signal
  • Is the a-th column in the two-dimensional channel matrix Is the pilot matrix.
  • the receiving vector in the a-th column is only related to the a-th column in the two-dimensional channel matrix. This is because the pilot sequence is only placed in one column.
  • the column vector of each column of the pilot matrix is a cyclic shift in which the column vector of the previous column moves one bit downward. This is due to the effect of placing the cyclic prefix (CP) of the pilot sequence in the guard interval.
  • CP cyclic prefix
  • the received signal can be multiplied by the conjugate transpose matrix of the pilot cyclic shift matrix to the left to obtain the channel estimation of column a, the specific calculation process As follows:
  • mode two this embodiment is different from the above mode one in that the selected pilot sequence is different.
  • the pilot sequence in this embodiment is another sequence that does not have autocorrelation characteristics, for example, the pilot sequence For other pilot sequences with better peak-to-average ratio suppression performance, such as pi/2-BPSK sequence, pi/4-QPSK sequence, etc.
  • the sending device of this embodiment adopts the same delay-Doppler domain mapping processing method as the first method to obtain the delay-Doppler domain signal, and the pilot sequence of the delay-Doppler domain signal can be placed as follows Shown in Figure 9.
  • the sending device of this embodiment can use the same OTFS coding, dimension transformation, waveform modulation and other processing as the above-mentioned method 1, and then send the transmission signal through the antenna port.
  • the receiving device receives the transmission signal and performs processing methods such as demodulation, dimensional transformation, and OTFS decoding on the transmission signal as shown in Figure 19 to obtain a delay-Doppler domain signal based on the pilot frequency agreed upon by the sending device and the receiving device Sequence placement mode and pilot sequence.
  • the pilot sequence of this embodiment does not need to have good autocorrelation properties by itself, and can also obtain channel estimation. It is only necessary that the DFT transform of the pilot sequence does not have a 0 value.
  • the receiving device can obtain the channel estimation result of column a through the following formula (3), and use the channel estimation result of column a to equalize and demodulate the data signal in the delay-Doppler domain, and restore the data signal of the sending device .
  • DFT is performed for the converted Y a
  • Y a is a column vector of the received (i.e., the above-described delay - Doppler domain of a column signal)
  • P a DFT is performed for the conversion, the pilot matrix P a.
  • the pilot region in the time delay-Doppler domain can be equivalent to the pilot sequence and time of the pilot region.
  • Cyclic convolution of the two-dimensional channel impulse response in the extended-Doppler domain Take the time delay-Doppler domain 1: K row, the ath column as an example, the mathematical expression is as follows:
  • the above matrix calculates the least squares estimation of the channel vector, and the DFT estimation of the channel can be obtained:
  • this processing method does not require the pilot sequence itself to have good autocorrelation properties to obtain channel estimation. It is only necessary that the DFT transform of the pilot sequence does not have a 0 value.
  • mode three is different from the above mode two in that the pilot sequence is placed in a different manner.
  • the transmitting device of this embodiment maps the data signal and the pilot sequence to the delay-Doppler domain.
  • the pilot sequence of the time delay-Doppler domain signal can be placed as shown in FIG. 17, that is, in this embodiment, the user-specific pilot sequence is used to occupy all the pilot regions. .
  • the sending device of this embodiment can use the same OTFS coding, dimension transformation, waveform modulation and other processing as the above-mentioned method 1, and then send the transmission signal through the antenna port.
  • the receiving device receives the transmission signal and performs processing methods such as demodulation, dimensional transformation, and OTFS decoding on the transmission signal as shown in Figure 19 to obtain a delay-Doppler domain signal based on the pilot frequency agreed upon by the sending device and the receiving device Sequence placement method and pilot sequence, the receiving device can multiply a matrix by the two ends of the following equation (7) The inverse of can be obtained Each element in. Last right Do IDFT transform, h a may be obtained for the estimate, i.e., a first column to obtain the channel estimation result by the first column of a channel estimation result of the delay - the data signals Doppler domain equalization, demodulation, resume sending The data signal of the device.
  • the pilot region in the time delay-Doppler domain can be equivalent to the pilot sequence and time of the pilot region. Cyclic convolution of the two-dimensional channel impulse response in the extended-Doppler domain. As shown in Figure 17, the pilot sequence of the pilot area is located in any row or column of the pilot area, and the pilot matrix is expressed in the form of a column vector:
  • Each element can be zero or non-zero. Similar to the processing method of the receiving device in the second mode, taking the 1:K row and the ath column of the delay-Doppler domain as an example, the mathematical expression is as follows:
  • the above-mentioned signal processing method in the embodiment of the present application may be applicable to high-speed mobile communication scenarios. For example: a communication scene on a highway with a speed of 120km/h, a communication scene on a high-speed rail with a speed of 500km/h, etc.
  • the above-mentioned signal processing method in the embodiment of the present application can move the digital signal processing to the time delay-Doppler domain.
  • the time delay-Doppler domain and the time-frequency domain construct a bridge through a two-dimensional orthogonal transformation. Therefore, the time delay-Doppler domain is a two-dimensional orthogonal mapping of the time-frequency domain. Through two-dimensional orthogonal mapping, the time-frequency domain changing channel is energy-averaged in the time-delay-Doppler domain.
  • the equivalent channel in the delay-Doppler domain has the following three characteristics compared with the channel in the time-frequency domain: Stability: the channel experienced by each signal in the delay-Doppler domain is almost completely Same; time delay-Doppler information discernibility: that is, in the time delay-Doppler domain, the channel shows a two-dimensional expansion. In the time delay domain, you can see the channel's multipath information. In the Le domain, you can see the Doppler spread of the channel; Orthogonality: Delay-Doppler channels are orthogonal, that is, the information of each path of the channel is not related to the information of other paths.
  • Doppler expansion Due to the distinguishability of Doppler expansion (traditional transmission methods can only show distinguishable multipath information), in high-speed moving scenes, the distinguishable Doppler expansion can be eliminated or reduced as much as possible through equalization methods. Inter-signal interference is suppressed, thereby improving system performance.
  • One or more of the pilot area, the placement mode of the pilot sequence, the pilot sequence, or the protection area involved in the signal processing method of the embodiment of the present application may be preset, which does not require additional signaling, and It may be agreed by the sending device and the receiving device through signaling. This application uses the following embodiments to explain the implementation of the sending device and the receiving device through the signaling agreement.
  • FIG. 20 is a flowchart of another signal processing method according to an embodiment of the application.
  • This embodiment is for uplink transmission, that is, the sending device is a terminal device and the receiving device is a network device.
  • the method of this embodiment can include:
  • Step 201 The network device sends at least one of the first indication information, the second indication information, the third indication information, or the fourth indication information to the terminal device.
  • the terminal device receives at least one of the first instruction information, the second instruction information, the third instruction information, or the fourth instruction information sent by the network device.
  • the first indication information is used to indicate the position of the pilot region in the time delay-Doppler domain.
  • the first indication information may indicate any of the delay-Doppler domains shown in Figs. 5-8.
  • the first indication information may include the number of grids occupied by the pilot area in the delay domain, the starting position in the delay domain, the number of grids occupied in the Doppler domain, and the number of grids in the Doppler domain. The starting position of the Puller field.
  • the second indication information is used to indicate the location of the resource unit carrying the pilot sequence.
  • the second indication information may indicate the pilot sequence setting manner as shown in FIG. 9.
  • the second indication information may include a column index, which is used to indicate which column the terminal device places the pilot sequence on, for example, the a-th column.
  • the second indication information may include an initial pattern value, and the initial pattern value is used to instruct the terminal device to determine the starting position of the pilot sequence pattern according to the initial pattern value.
  • the patterns of the pilot sequence will be orthogonal.
  • the second indication information may indicate the pilot sequence setting mode as shown in FIG. 10, which is presented in the pattern shown in FIG. 10, and the initial pattern value 1 may indicate the pilot sequence pattern as shown in FIG.
  • the initial pattern value of 2 may indicate that the pattern of the pilot sequence shown in FIG. 10 is cyclically shifted to the right by one grid.
  • the third indication information is used to indicate the pilot sequence.
  • the third indication information may indicate a pilot sequence orthogonal to other terminal devices.
  • the third indication information may include an initial value, and the initial value is used to instruct the terminal device to generate a pilot sequence orthogonal to other terminal devices according to the initial value.
  • the fourth indication information is used to indicate the position of the protection area in the delay-Doppler domain.
  • the position of the protected area may be preset or indicated by signaling.
  • the network device may send the fourth indication information to the terminal device.
  • the network device may send at least one of the first indication information, the second indication information, the third indication information, or the fourth indication information to the terminal device through at least one of the following signaling;
  • the signaling may include downlink control information (Downlink Control Information, DCI), radio resource control (Radio Resource Control, RRC), or media access control (Media Access Control, MAC) control element (CE).
  • Step 202 The terminal device maps the pilot sequence to the pilot region of the delay-Doppler domain according to at least one of the first indication information, the second indication information, the third indication information, or the fourth indication information. , Map the cyclic prefix of the pilot sequence to the guard interval of the delay-Doppler domain, map the data signal to the data area of the delay-Doppler domain, and obtain the delay-Doppler domain signal.
  • the position of the pilot area in the delay-Doppler domain, the position of the pilot sequence in the pilot area, the position of the pilot sequence, the guard interval, and the area size can be preset, or can be indicated by the above step 201 Information instructions.
  • the terminal device maps the pilot sequence, the cyclic prefix of the pilot sequence, and the data signal to the corresponding time delay-Doppler domain through step 202 to obtain the time delay-Doppler domain signal.
  • Step 203 The terminal device processes the time delay-Doppler domain signal to obtain a transmission signal.
  • the terminal device can convert the time delay-Doppler domain signal, convert the time delay-Doppler domain signal into a time-frequency domain signal, and then compare the time-frequency domain signal. Transform the dimensionality of the signal in the domain to obtain the time domain signal, and perform processing such as waveform modulation on the time domain signal to obtain the transmission signal,
  • Step 204 The terminal device sends a transmission signal to the network device.
  • the network device receives the transmission signal sent by the terminal device.
  • Step 205 The network equipment processes the transmission signal, obtains the time delay-Doppler domain signal, performs channel estimation according to the time delay-Doppler domain signal and the pilot sequence, and obtains the equivalent channel of the time delay-Doppler domain .
  • Step 206 The network device performs equalization processing on the data signal in the data area according to the equivalent channel.
  • the network device performs processing such as equalization and demodulation on the data signal in the data area according to the equivalent channel to recover the data signal sent by the sending device.
  • the network device sends at least one of the first instruction information, the second instruction information, the third instruction information, or the fourth instruction information to the terminal device, and the terminal device sends the pilot sequence to the terminal device according to the at least one instruction information.
  • Map to the pilot area of the delay-Doppler domain map the cyclic prefix of the pilot sequence to the guard interval of the delay-Doppler domain, and map the data signal to the data area of the delay-Doppler domain
  • the terminal device processes the delay-Doppler domain signal to obtain the transmission signal
  • the terminal device sends the transmission signal to the network device
  • the network device processes the transmission signal to obtain the delay-multiple For Pule domain signals
  • channel estimation is performed based on the delay-Doppler domain signal and pilot sequence to obtain the equivalent channel of the delay-Doppler domain.
  • the network equipment equalizes the data signal in the data area according to the equivalent channel , To recover the data signal of the network device, so as to realize the communication between the sending device and the receiving device.
  • the sending device maps the pilot sequence to all rows in the pilot region of the delay-Doppler domain, so that the energy of the pilot sequence Dispersed in the time delay domain of the entire pilot area, it can avoid the impact signal with higher energy after the delay-Doppler domain signal undergoes the OTFS coding operation, which can reduce the peak-to-average ratio in the communication process and reduce signal distortion. Improve communication quality.
  • the network device can flexibly and dynamically indicate to the terminal device the position of the pilot area in the delay-Doppler domain, the position of the resource unit carrying the pilot sequence, the pilot sequence, and the protection area in the delay-Doppler domain. One or more of the positions in.
  • the sending device is a network device
  • the receiving device is a terminal device. Similar to the uplink transmission in the embodiment described in FIG. 20, the network device can send the first indication information, the second indication information, the third indication information, Or any one or more of the fourth indication information to agree with the terminal equipment that the position of the pilot area in the delay-Doppler domain, the position of the resource unit carrying the pilot sequence, the pilot sequence, and the protection area One or more of the positions in the time delay-Doppler domain.
  • the embodiments of the present application describe in detail the schematic structure of the wireless communication device.
  • FIG. 21 shows a schematic block diagram of a wireless communication device 2100 according to an embodiment of the present application.
  • the apparatus 2100 in the embodiment of the present application may be the sending device in the foregoing method embodiment, or may be one or more chips in the sending device.
  • the apparatus 2100 may be used to perform part or all of the functions of the sending device in the foregoing method embodiment.
  • the device 2100 may include a first transceiver module 2110 and a second processing module 2120.
  • the device 2100 may further include a first storage module 2130.
  • the first transceiver module 2110 can be used to perform the acquisition of the pilot sequence in step S101 in the foregoing method embodiment, send the transmission signal in step 103, or be used to receive the first instruction from the network device in step S201 Information, at least one of the second instruction information, the third instruction information, or the fourth instruction information, the transmission signal in step 204 is sent.
  • the first processing module 2120 may be used to perform step S102 in the foregoing method embodiment, or used to perform step S202 and step 203.
  • the device 2100 may also be configured as a general processing system, such as a chip
  • the first processing module 2120 may include: one or more processors that provide processing functions; the first transceiver module 2110 may be, for example, an input /Output interface, pin or circuit, etc.
  • the input/output interface can be used for the information interaction between this chip system and the outside world. For example, this input/output interface can output the transmission signal of the sending device to other modules outside the chip for processing .
  • the processing module can execute the computer-executable instructions stored in the storage module to implement the function of the sending device in the foregoing method embodiment.
  • the first storage module 2130 optionally included in the apparatus 2100 may be a storage unit in a chip, such as a register, a cache, etc., and the first storage module 2130 may also be a chip located in the sending device.
  • External storage units such as read-only memory (ROM) or other types of static storage devices that can store static information and instructions, random access memory (RAM), etc.
  • FIG. 22 shows a schematic block diagram of another wireless communication device 2200 according to an embodiment of the present application.
  • the apparatus 2200 in the embodiment of the present application may be the sending device in the foregoing method embodiment, and the apparatus 2200 may be used to perform part or all of the functions of the sending device in the foregoing method embodiment.
  • the device 2200 may include a processor 2210, a baseband circuit 2230, a radio frequency circuit 2240, and an antenna 2250.
  • the device 2200 may further include a memory 2220.
  • the various components of the device 2200 are coupled together via a bus 2260.
  • the bus system 2260 also includes a power bus, a control bus, and a status signal bus. However, for clear description, various buses are marked as the bus system 2260 in the figure.
  • the processor 2210 may be used to control the sending device, to execute the processing performed by the sending device in the foregoing embodiment, and to execute the processing procedure related to the sending device in the foregoing method embodiment and/or be used in the technology described in this application. In other processes, you can also run the operating system, manage the bus, and can execute programs or instructions stored in the memory.
  • the baseband circuit 2230, the radio frequency circuit 2240, and the antenna 2250 can be used to support the sending and receiving of information between the sending device and the receiving device involved in the foregoing embodiments, so as to support wireless communication between the sending device and the receiving device.
  • the first indication information sent from the receiving device in the uplink transmission is received via the antenna 2250, filtered, amplified, down-converted, and digitized by the radio frequency circuit 2240, and then decoded by the baseband circuit 2230, and de-encapsulated according to the protocol.
  • the processor 2210 After baseband processing such as data, the processor 2210 performs processing to restore the signaling information sent by the receiving device in the uplink transmission; in another example, the transmission signal of the sending device can be processed by the processor 2210, and the baseband circuit 2230 performs the processing Baseband processing such as protocol encapsulation and encoding is further processed by the radio frequency circuit 2240 such as analog conversion, filtering, amplification, and up-conversion, and then transmitted via the antenna 2250.
  • the radio frequency circuit 2240 such as analog conversion, filtering, amplification, and up-conversion
  • the memory 2220 may be used to store program codes and data of the sending device, and the memory 2220 may be the first storage module 2130 in FIG. 21. It is understandable that the baseband circuit 2230, the radio frequency circuit 2240, and the antenna 2250 may also be used to support the transmitting device to communicate with other network entities, for example, to support the transmitting device to communicate with the network element on the core network side.
  • the memory 2220 in FIG. 22 is shown as being separated from the processor 2210. However, those skilled in the art can easily understand that the memory 2220 or any part thereof may be located outside the wireless communication device 2200.
  • the memory 2220 may include a transmission line and/or a computer product separated from the wireless node, and these media can be accessed by the processor 2210 through the bus interface 2260.
  • the memory 2220 or any part thereof may be integrated into the processor 2210, for example, may be a cache and/or a general register.
  • FIG. 22 only shows a simplified design of the sending device.
  • the sending device may include any number of transmitters, receivers, processors, memories, etc., and all sending devices that can implement the application are within the protection scope of the application.
  • the wireless communication device can also be implemented using one or more field-programmable gate arrays (FPGA), programmable logic devices (PLD), Controllers, state machines, gate logic, discrete hardware components, any other suitable circuits, or any combination of circuits capable of performing the various functions described throughout this application.
  • FPGA field-programmable gate arrays
  • PLD programmable logic devices
  • Controllers state machines
  • gate logic discrete hardware components
  • any other suitable circuits any combination of circuits capable of performing the various functions described throughout this application.
  • an embodiment of the present application further provides a computer storage medium, which can store a program instruction for indicating any of the above methods, so that the processor executes the program instruction to implement the above method embodiment It involves the methods and functions of the sending device.
  • FIG. 23 shows a schematic block diagram of a wireless communication device 2300 according to an embodiment of the present application.
  • the apparatus 2300 in this embodiment of the application may be the receiving device in the foregoing method embodiment, or may be one or more chips in the receiving device.
  • the apparatus 2300 may be used to perform part or all of the functions of the receiving device in the foregoing method embodiment.
  • the device 2300 may include a second processing module 2310 and a second transceiver module 2320.
  • the device 2300 may further include a second storage module 2330.
  • the second transceiver module 2320 may be used to receive the transmission signal of step S103 in the foregoing method embodiment, or used to receive the transmission signal from the sending device in step S204, or used to send the first instruction information of step S201 , At least one of the second indication information, the third indication information, or the fourth indication information;
  • the second processing module 2310 may be used to perform step S104 in the foregoing method embodiment, or used to perform step S205 and step 206;
  • the device 2300 may also be configured as a general-purpose processing system, such as a general-purpose chip.
  • the second processing module 2310 may include: one or more processors that provide processing functions; the second transceiver module may be an input/ Output interface, pin or circuit, etc.
  • the input/output interface can be used for information interaction between the chip system and the outside world. For example, the input/output interface can output the first indication information to other modules outside the chip for processing.
  • the one or more processors can execute computer-executable instructions stored in the storage module to implement the functions of the receiving device in the foregoing method embodiments.
  • the optional second storage module 2330 included in the apparatus 2300 may be a storage unit in the chip, such as a register, a cache, etc., and the storage module 2330 may also be an external storage module in the receiving device.
  • Storage unit such as read-only memory (ROM for short) or other types of static storage devices that can store static information and instructions, random access memory (RAM for short), etc.
  • FIG. 24 shows a schematic block diagram of another wireless communication device 2400 according to an embodiment of the present application.
  • the apparatus 2400 in the embodiment of the present application may be the receiving device in the foregoing method embodiment, and the apparatus 2400 may be used to perform part or all of the functions of the receiving device in the foregoing method embodiment.
  • the device 2400 may include a processor 2410, a baseband circuit 2430, a radio frequency circuit 2440, and an antenna 2450.
  • the device 2400 may further include a memory 2420.
  • the various components of the device 2400 are coupled together via a bus 2460.
  • the bus system 2460 also includes a power bus, a control bus, and a status signal bus. However, for clear description, various buses are marked as the bus system 2460 in the figure.
  • the processor 2410 may be used to control the receiving device, to perform the processing performed by the receiving device in the above-mentioned embodiment, and to perform the processing procedure related to the receiving device in the above-mentioned method embodiment and/or used in the technology described in this application. In other processes, you can also run the operating system, manage the bus, and can execute programs or instructions stored in the memory.
  • the baseband circuit 2430, the radio frequency circuit 2440, and the antenna 2450 may be used to support the sending and receiving of information between the receiving device and the sending device involved in the foregoing embodiment, so as to support wireless communication between the receiving device and the sending device.
  • the transmission signal sent by the sending device for uplink transmission is received by the antenna 2450, filtered, amplified, down-converted, and digitized by the radio frequency circuit, and then decoded by the baseband circuit, and after the baseband processing such as unpacking the data according to the protocol ,
  • the processor 2410 performs processing to restore the service data sent by the sending device; in another example, the first indication information of the receiving device for uplink transmission can be processed by the processor 2410, and encapsulated according to the protocol via the baseband circuit 2430, and encoded
  • the radio frequency circuit 2440 performs analog conversion, filtering, amplification, and up-conversion, and then transmits it through the antenna 2450.
  • the memory 2420 can be used to store the program code and data of the receiving device.
  • the memory 2420 can be shown in Figure 23.
  • the storage module 2330 It can be understood that the baseband circuit 2430, the radio frequency circuit 2440, and the antenna 2450 can also be used to support the receiving device to communicate with other network entities, for example, to support the receiving device to communicate with the core network device.
  • FIG. 24 only shows a simplified design of the receiving device.
  • the receiving device may include any number of transmitters, receivers, processors, memories, etc., and all receiving devices that can implement the application are within the protection scope of the application.
  • the wireless communication device can also be implemented using one or more field-programmable gate arrays (FPGA), programmable logic devices (PLD), Controllers, state machines, gate logic, discrete hardware components, any other suitable circuits, or any combination of circuits capable of performing the various functions described throughout this application.
  • FPGA field-programmable gate arrays
  • PLD programmable logic devices
  • Controllers state machines
  • gate logic discrete hardware components
  • any other suitable circuits any combination of circuits capable of performing the various functions described throughout this application.
  • an embodiment of the present application also provides a computer storage medium, which can store program instructions for indicating any of the above methods, so that the processor executes the program instructions to implement the above method embodiments.
  • the method and function of the receiving device are involved.
  • the processors involved in the foregoing device 2200 and device 2400 may be general-purpose processors, such as general-purpose central processing units (CPU), network processors (Network Processor, NP), microprocessors, etc., or may be application-specific integrated circuits ( application-specific integrated circBIt, ASIC for short), or one or more integrated circuits used to control the execution of the program of this application. It may also be a digital signal processor (Digital Signal Processor, DSP for short), a Field-Programmable Gate Array (FPGA for short) or other programmable logic devices, discrete gates or transistor logic devices, or discrete hardware components.
  • DSP Digital Signal Processor
  • FPGA Field-Programmable Gate Array
  • the controller/processor may also be a combination of computing functions, for example, a combination of one or more microprocessors, a combination of a DSP and a microprocessor, and so on.
  • the processor usually executes logic and arithmetic operations based on program instructions stored in the memory.
  • the memory involved in the foregoing device 2200 and device 2400 may also store an operating system and other application programs.
  • the program may include program code, and the program code includes computer operation instructions.
  • the foregoing memory may be a read-only memory (read-only memory, ROM for short), other types of static storage devices that can store static information and instructions, random access memory (RAM for short), and storage Other types of dynamic storage devices for information and instructions, disk storage, etc.
  • the memory can be a combination of the storage types described above.
  • the foregoing computer-readable storage medium/memory may be in the processor, or external to the processor, or distributed on multiple entities including the processor or processing circuit.
  • the foregoing computer-readable storage medium/memory may be embodied in a computer program product.
  • the computer program product may include a computer-readable medium in packaging materials.
  • the disclosed system, device, and method may be implemented in other ways.
  • the device embodiments described above are only illustrative.
  • the division of the units is only a logical function division, and there may be other divisions in actual implementation, for example, multiple units or components can be combined or It can be integrated into another system, or some features can be ignored or not implemented.
  • the displayed or discussed mutual coupling or direct coupling or communication connection may be indirect coupling or communication connection through some interfaces, devices or units, and may be in electrical, mechanical or other forms.
  • the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.
  • each unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.
  • the above-mentioned integrated unit can be implemented in the form of hardware or software functional unit.
  • the computer program product includes one or more computer instructions.
  • the computer may be a general-purpose computer, a special-purpose computer, a computer network, or other programmable devices.
  • the computer instructions may be stored in a computer-readable storage medium or transmitted from one computer-readable storage medium to another computer-readable storage medium. For example, the computer instructions may be transmitted from a website, computer, server, or data center.
  • the computer-readable storage medium may be any available medium that can be accessed by a computer or a data storage device such as a server or a data center integrated with one or more available media.
  • the usable medium may be a magnetic medium (for example, a floppy disk, a hard disk, and a magnetic tape), an optical medium (for example, a DVD), or a semiconductor medium (for example, a solid state disk).

Abstract

Des modes de réalisation de l'invention concernent un procédé et un appareil de traitement de signaux. Dans le procédé de traitement de signaux selon l'invention, un dispositif d'émission obtient une séquence pilote; le dispositif d'émission mappe la séquence pilote sur une zone pilote d'un domaine à retard Doppler, mappe un préfixe cyclique de la séquence pilote sur un intervalle de garde du domaine à retard Doppler, mappe un signal de données sur une zone de données du domaine à retard Doppler et obtient un signal de domaine à retard Doppler, la séquence pilote étant située dans toutes les rangées de la zone pilote; le dispositif d'émission envoie un signal de transmission à un dispositif de réception, le signal de transmission étant obtenu par traitement du signal de domaine à retard Doppler. Les modes de réalisation de l'invention permettent de réduire le rapport valeur de crête - valeur moyenne dans un processus de communication ainsi que la distorsion de signal, et d'améliorer la qualité de communication.
PCT/CN2020/088919 2019-05-27 2020-05-07 Procédé et appareil de traitement de signaux WO2020238573A1 (fr)

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