WO2021143644A1 - Procédé et appareil de suivi de phase de porteuse - Google Patents

Procédé et appareil de suivi de phase de porteuse Download PDF

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Publication number
WO2021143644A1
WO2021143644A1 PCT/CN2021/071065 CN2021071065W WO2021143644A1 WO 2021143644 A1 WO2021143644 A1 WO 2021143644A1 CN 2021071065 W CN2021071065 W CN 2021071065W WO 2021143644 A1 WO2021143644 A1 WO 2021143644A1
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Prior art keywords
frequency domain
phase
ofdm symbol
phase compensation
domain
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PCT/CN2021/071065
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English (en)
Chinese (zh)
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李刚
任斌
张振宇
达人
孙韶辉
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大唐移动通信设备有限公司
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Publication of WO2021143644A1 publication Critical patent/WO2021143644A1/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
    • H04L27/2647—Arrangements specific to the receiver only
    • H04L27/2655—Synchronisation arrangements
    • H04L27/2668—Details of algorithms
    • H04L27/2669—Details of algorithms characterised by the domain of operation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
    • G01S19/00—Satellite radio beacon positioning systems; Determining position, velocity or attitude using signals transmitted by such systems
    • G01S19/01—Satellite radio beacon positioning systems transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/13—Receivers
    • G01S19/21—Interference related issues ; Issues related to cross-correlation, spoofing or other methods of denial of service
    • 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
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
    • H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
    • H04L27/3863—Compensation for quadrature error in the received signal
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
    • H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
    • H04L27/38—Demodulator circuits; Receiver circuits
    • H04L27/3845—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier
    • H04L27/3854—Demodulator circuits; Receiver circuits using non - coherent demodulation, i.e. not using a phase synchronous carrier using a non - coherent carrier, including systems with baseband correction for phase or frequency offset
    • H04L27/3872—Compensation for phase rotation in the demodulated signal

Definitions

  • This application relates to the field of communication technology, and in particular to a method and device for carrier phase tracking.
  • a variety of user terminal positioning methods have been defined in the 3rd Generation Partnership Project (3GPP), including Observed Time Difference Of Arrival (OTDOA) and Enhanced-Cell ID positioning method (Enhanced-Cell). Identification, E-CID) and Uplink Observed Time Difference Of Arrival (UTDOA) and so on.
  • 3GPP 3rd Generation Partnership Project
  • OTDOA Observed Time Difference Of Arrival
  • Enhanced-Cell ID positioning method Enhanced-Cell ID positioning method
  • Identification E-CID
  • UTDOA Uplink Observed Time Difference Of Arrival
  • the main advantage of these methods is that the terminal position can be determined by measuring the own reference signal of the wireless communication network, rather than based on the external reference signal of the wireless communication network. Since these positioning methods are based on the wireless communication network's own reference signals, these positioning methods can work in environments where external reference signals, such as Global Navigation Satellite System (GNSS) satellite signals, cannot be received.
  • GNSS Global Navigation Satellite System
  • the common problem of these positioning methods
  • the GNSS carrier phase positioning technology is a well-known high-precision positioning technology.
  • the GNSS receiver accurately determines the position of the GNSS receiver by measuring the carrier phase measurement value obtained by measuring the GNSS satellite signal.
  • the high-precision GNSS system uses carrier phase tracking technology.
  • GNSS uses a single carrier
  • its phase tracking technology only uses a single carrier system, which cannot be applied to the complex orthogonal frequency division multiplexing of 5G New Radio (NR).
  • NR New Radio
  • OFDM Orthogonal Frequency Division Multiplexing
  • the embodiments of the present application provide a carrier phase tracking method and device to solve the multi-carrier phase tracking problem of the OFDM system.
  • An embodiment of the present application provides a carrier phase tracking method, including:
  • a time domain phase compensation value is obtained based on the frequency domain phase compensation value, and the time domain OFDM symbol is phase compensated by the time domain phase compensation value.
  • An embodiment of the present application also provides a carrier phase tracking device, including:
  • the first acquisition module is configured to acquire a time-domain orthogonal frequency division multiplexing OFDM symbol, and acquire a positioning reference signal PRS frequency domain signal corresponding to a terminal serving cell based on the time-domain OFDM symbol;
  • the first phase compensation module is configured to obtain a frequency domain phase compensation value based on the PRS frequency domain signal, and perform phase compensation on the PRS frequency domain signal through the frequency domain phase compensation value;
  • the second phase compensation module is configured to obtain a time domain phase compensation value based on the frequency domain phase compensation value, and perform phase compensation on the time domain OFDM symbol through the time domain phase compensation value.
  • An embodiment of the present application also provides an electronic device including a memory, a processor, and a computer program stored in the memory and capable of running on the processor, and the processor implements the carrier phase tracking method when the computer program is executed A step of.
  • the embodiment of the present application also provides a non-transitory computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps of the carrier phase tracking method are realized.
  • the carrier phase tracking method and device provided in the embodiments of the present application obtain the PRS frequency domain signal based on the obtained time domain OFDM symbol, and obtain the frequency domain phase compensation value based on the PRS frequency domain signal, so that the frequency domain phase compensation value is used to compare the PRS frequency Phase compensation is performed on the signal in the frequency domain, and the time domain phase compensation value is obtained based on the frequency domain phase compensation value. Finally, the time domain OFDM symbol is phase compensated by the time domain phase compensation value; this realizes the difference between the PRS frequency domain signal and the time domain phase compensation value.
  • the frequency domain feedback loop is formed between the frequency domain feedback loop, thereby realizing the phase tracking of each sub-carrier level in the frequency domain OFDM symbol, and solving the multi-carrier phase tracking problem of the OFDM system; in addition, the time domain OFDM symbol, the frequency domain phase compensation value and the time domain A time-domain feedback loop is formed between the phase compensation values to realize the phase tracking of each OFDM symbol, thereby improving the tracking speed and tracking accuracy.
  • FIG. 1 is a flowchart of steps of a carrier phase tracking method in an embodiment of this application
  • Figure 2 is a schematic diagram of a carrier phase tracking system in an embodiment of the application
  • Fig. 3 is a block diagram of a carrier phase tracking device in an embodiment of the application.
  • FIG. 4 is a schematic diagram of the structure of an electronic device in an embodiment of the application.
  • FIG. 1 it is a flowchart of the steps of a carrier phase tracking method in an embodiment of the application, and the method includes the following steps:
  • Step 101 Obtain a time domain OFDM symbol, and obtain a PRS frequency domain signal corresponding to a terminal serving cell based on the time domain OFDM symbol.
  • the baseband signal is obtained through down-conversion processing; in addition, the terminal only communicates with the PRS signal of other cells before receiving the PRS signal from other cells.
  • the serving cell maintains a good synchronization relationship. Therefore, when the terminal receives the PRS signal sent by the neighboring cell, in order to track the carrier phase of the PRS signal of the neighboring cell, it first needs to synchronize the time through the PRS signal of the neighboring cell, and obtain the time synchronization. Then, the cyclic prefix (CP) of the OFDM symbol is removed according to the system configuration parameters to obtain the time-domain OFDM symbol in this embodiment.
  • CP cyclic prefix
  • the PRS sequence has good correlation
  • the PRS sequence generated locally by the terminal can be used for sliding correlation with the received baseband signal.
  • the position of the relevant peak can complete the time synchronization work; of course, the specific method of time synchronization is not specifically limited here.
  • FFT Fast Fourier Transform
  • the acquisition and measurement of the carrier phase are based on the PRS signal, and the PRS signals of different cells have different subcarrier distribution positions in the frequency domain, it can be extracted from the frequency domain OFDM symbols according to the system configuration parameters.
  • the frequency domain signal of the PRS signal corresponding to the serving cell of the terminal is output, that is, the PRS frequency domain signal.
  • Step 102 Obtain a frequency domain phase compensation value based on the PRS frequency domain signal, and perform phase compensation on the PRS frequency domain signal through the frequency domain phase compensation value.
  • the frequency domain phase compensation value is obtained based on the PRS frequency domain signal, and the PRS frequency domain signal is phase compensated by the frequency domain phase compensation value, that is, the phase correction is performed, and the PRS frequency domain signal and frequency domain phase are realized
  • a frequency domain feedback loop is formed between the compensation values.
  • the phase change can be tracked in real time, thereby realizing the phase tracking of each subcarrier level in the OFDM symbol and solving the multi-carrier phase tracking problem of the OFDM system.
  • Step 103 Obtain a time domain phase compensation value based on the frequency domain phase compensation value, and perform phase compensation on the time domain OFDM symbol through the time domain phase compensation value.
  • a time domain phase compensation value for phase compensation of the time domain OFDM symbol is obtained, and the time domain phase compensation value is used to phase the time domain OFDM symbol.
  • Compensation that is, phase correction, realizes the formation of a time domain feedback loop between the time domain OFDM symbol, frequency domain phase compensation value, and time domain phase compensation value, and the time domain feedback loop can be based on the frequency domain of the frequency domain feedback loop
  • the phase compensation value obtains the time domain phase compensation value, thereby performing phase compensation on the time domain OFDM symbol.
  • the phase change of the time domain OFDM symbol can be tracked in real time, thereby realizing the phase tracking of each time domain OFDM symbol. Improve the tracking speed and tracking accuracy.
  • the frequency domain phase compensation value is obtained based on the PRS frequency domain signal, and the PRS frequency domain signal is phase compensated based on the frequency domain phase compensation value.
  • the phase compensation value is used to obtain the time domain phase compensation value, and the time domain OFDM symbol is phase compensated by the time domain phase compensation value.
  • the frequency domain feedback loop is formed between the PRS frequency domain signal and the time domain phase compensation value.
  • Time domain OFDM The symbol, the frequency domain phase compensation value and the time domain phase compensation value form a time domain feedback loop, so as to realize the phase tracking of each subcarrier level in the frequency domain OFDM symbol based on the frequency domain feedback loop, which solves the problem of the OFDM system.
  • Multi-carrier phase tracking is a problem, and the phase tracking of each OFDM symbol is realized based on the time-domain feedback loop, thereby improving the tracking speed and tracking accuracy.
  • the phase difference between the PRS frequency domain signal and the pre-acquired base station side PRS frequency domain signal can be obtained, and then the phase difference is obtained based on the phase difference. Frequency domain phase compensation value.
  • the phase difference when acquiring the phase difference between the PRS frequency domain signal and the pre-acquired base station side PRS frequency domain signal, the phase difference can be calculated by the following formula:
  • k represents the number of the subcarrier corresponding to the PRS frequency domain signal
  • k 0 represents the number of the starting subcarrier corresponding to the PRS frequency domain signal
  • the pre-acquired PRS frequency domain signal at the base station The phase of each subcarrier is known.
  • the PRS frequency domain signal The phase of the base station side PRS frequency domain signal , Get the phase difference between the two
  • the frequency domain phase compensation value can be calculated based on the phase difference through the following formula:
  • a f value is related to the time delay experienced by the input signal.
  • this embodiment can obtain the frequency domain phase compensation value corresponding to each subcarrier in the PRS frequency domain signal based on the phase difference between the acquired PRS frequency domain signal and the pre-acquired base station side PRS frequency domain signal, thereby The PRS phase can be corrected, and the phase tracking of the sub-carrier level in the frequency domain OFDM symbol can be realized.
  • the starting subcarrier in the PRS frequency domain signal when performing phase compensation on the PRS frequency domain signal by using the frequency domain phase compensation value, may be based on the frequency domain phase compensation value corresponding to the starting subcarrier. Perform phase compensation for the PRS frequency domain signal corresponding to the starting subcarrier; for the subcarriers in the PRS frequency domain signal except the starting subcarrier, based on the frequency domain phase compensation value corresponding to the adjacent subcarrier before the subcarrier , Perform phase compensation on the PRS frequency domain signal corresponding to the subcarrier.
  • phase compensation value uses the following formula to perform phase compensation on the PRS frequency domain signal corresponding to the subcarrier:
  • k represents the number of the subcarrier corresponding to the PRS frequency domain signal
  • k 0 represents the number of the starting subcarrier
  • C represents the adjacent subcarrier spacing.
  • the phase of the current subcarrier can be compensated based on the frequency domain phase compensation value of the adjacent subcarrier; when the subcarrier number k is the starting subcarrier When the carrier number is k 0 , the phase of the current sub-carrier can be directly compensated based on the frequency-domain phase compensation value of the current sub-carrier, so as to realize the phase tracking of the OFDM in line with the sub-carrier level and solve the multi-carrier phase tracking problem of the OFDM system , And improve the tracking accuracy.
  • the time domain phase compensation value when the time domain phase compensation value is obtained based on the frequency domain phase compensation value, the time domain inter-symbol phase shift may be obtained based on the frequency domain phase compensation value, and the time domain phase may be obtained based on the time domain inter-symbol phase shift. Compensation value.
  • the subcarriers in the PRS frequency domain signal can be fitted based on the frequency domain phase compensation value, and the phase of the first subcarrier after fitting The value is determined as the phase shift between symbols in the time domain.
  • the phases of adjacent sub-carriers are increasing. Theoretically, the phases of all sub-carriers are linear. However, due to the presence of noise, the phases of sub-carriers are dispersed.
  • a polynomial fitting method can be used to obtain a linear polynomial, and the phase value of the first subcarrier after fitting can be obtained as the time domain inter-symbol phase shift of the mth OFDM symbol.
  • the time-domain phase compensation value when the time-domain phase compensation value is obtained based on the time-domain inter-symbol phase shift, the time-domain phase compensation value may be calculated based on the time-domain inter-symbol phase shift through the following formula:
  • M represents the time-domain OFDM symbol time domain phase compensation value
  • m is the number of the time domain OFDM symbol
  • S m denotes a time domain symbol between the m-th time domain OFDM symbol phase shift
  • a t greater than zero and less than the second predetermined factor is equal to 1.
  • a t values can be determined according to the actual situation, which is not specifically defined.
  • the time-domain inter-symbol phase shift of the time-domain OFDM symbol can be directly used as the time-domain phase compensation value; when the number m of the OFDM symbol is greater than At 0, the time domain phase of the mth time domain OFDM symbol is determined by the time domain phase compensation value of the (m-1)th time domain OFDM symbol and the time domain inter-symbol phase shift of the mth time domain OFDM symbol The compensation value, so that the time domain OFDM symbol can be phase compensated through the obtained time domain phase compensation value, thereby realizing the phase tracking of each OFDM symbol.
  • the time domain phase compensation value when used to perform phase compensation on the time domain OFDM symbol, the time domain phase compensation value may be used to perform the phase compensation on the time domain OFDM symbol through the following formula:
  • this embodiment can perform the Update the corresponding time domain phase compensation value, and when the adjacent time domain OFDM symbol has a phase jump, the phase difference of the adjacent time domain OFDM symbol in the time domain OFDM symbol can be compensated.
  • this embodiment further includes the following steps after obtaining the time domain phase compensation value based on the frequency domain phase compensation value:
  • Step A1 Obtain the frequency domain phase measurement value based on the phase difference.
  • the frequency domain phase measurement value may be obtained based on the phase difference between the PRS frequency domain signal and the pre-acquired base station side PRS frequency domain signal.
  • the frequency domain phase measurement value when the frequency domain phase measurement value is obtained based on the phase difference, the frequency domain phase measurement value may be calculated based on the phase difference by the following formula:
  • the frequency domain phase measurement value can track the change of the actual phase in the frequency domain without difference.
  • the frequency domain phase measurement value of all subcarriers in the frequency domain OFDM symbol can also be fitted to obtain the fitted frequency domain OFDM symbol Frequency domain phase measurement values of all sub-carriers within. That is, for the frequency domain phase measurement values of all subcarriers in the m-th frequency domain OFDM symbol, a polynomial fitting method is used to obtain a linear polynomial, and the phase values of all subcarriers after fitting are obtained as the frequency domain phase measurement values.
  • Step A2 Obtain no fixed phase difference in the time domain based on the time domain phase compensation value.
  • the time domain no fixed phase difference is obtained based on the time domain phase compensation value, so that the time domain no fixed phase difference can track the actual phase change in the time domain without difference.
  • the time domain no fixed phase difference can be calculated based on the time domain phase compensation value through the following formula:
  • m represents the number of the time domain OFDM symbol
  • M represents the time-domain OFDM symbol time domain phase compensation value
  • mean (a t * s m ) represents a phase of the average of the previous m-th time domain OFDM symbols in the time domain OFDM symbol
  • s m indicates the frequency domain based on phase compensation time domain symbols worth to the m-th time domain OFDM symbol phase shift
  • a t that is greater than 0 and less than the second predetermined factor is equal to 1.
  • Step A3 Obtain the carrier phase based on the time domain no fixed phase difference and the frequency domain phase measurement value.
  • the carrier phase is obtained based on the time domain non-fixed phase difference and the frequency domain phase measurement value.
  • the actual phase change in the time domain can be tracked without difference
  • the frequency domain phase measurement value can be Tracking the actual phase change in the frequency domain without difference, so that the carrier phase obtained based on the time domain no fixed phase difference and the frequency domain phase measurement value can track the change of the input signal phase without phase difference, avoiding the direct extraction of the time domain feedback loop
  • the carrier phase obtained based on the time domain no fixed phase difference and the frequency domain phase measurement value can track the change of the input signal phase without phase difference, avoiding the direct extraction of the time domain feedback loop
  • the carrier phase when the carrier phase is obtained based on the time domain no fixed phase difference and the frequency domain phase measurement value, the carrier phase can be obtained based on the time domain no fixed phase difference and the frequency domain phase measurement value through the following formula:
  • the carrier phase is obtained by the above formula, which realizes the mixing of no fixed phase difference in the time domain and the measured value of the frequency domain phase, so that the obtained total carrier phase can track the change of the input signal phase without phase difference.
  • the frequency domain feedback loop composed of the frequency domain phase compensation value and the PRS frequency domain signal realizes the phase tracking of each subcarrier level in the OFDM symbol, and the time domain composed of the time domain OFDM symbol and the time domain phase compensation value is used.
  • the feedback loop in the domain realizes the phase tracking of each OFDM symbol, which makes it possible to achieve faster tracking and higher tracking accuracy; in addition, the carrier phase is obtained through the synthesis of no fixed phase difference in the time domain and the frequency domain phase measurement value, which is based on the time There is no fixed phase difference in the domain to track the actual phase change in the time domain without difference, and the frequency domain phase measurement value can track the actual phase change in the frequency domain without difference, so that the total output phase, that is, the carrier phase, can track the change of the input signal without phase difference.
  • the baseband signal is obtained through down-conversion processing.
  • the terminal will only maintain a good synchronization relationship with the serving cell before receiving the PRS signal of other cells. Therefore, when the terminal receives the PRS signal sent by the neighboring cell, in order to track the carrier phase of the PRS signal of the neighboring cell, it must first pass the PRS signal carrier phase.
  • the PRS signal of the neighboring cell is time synchronized. That is, in FIG. 2, the time synchronization module 1 is used to perform time synchronization through the PRS signal sent by the neighboring cell, and output time domain OFDM symbols.
  • FIG. 2 the time synchronization module 1 is used to perform time synchronization through the PRS signal sent by the neighboring cell, and output time domain OFDM symbols.
  • the PRS sequence generated locally by the terminal can be used for sliding correlation with the received baseband signal.
  • the position of the relevant peak can complete the time synchronization work; of course, the specific method of time synchronization is not specifically limited here.
  • the CP removal module 2 can remove the CP of each time domain OFDM symbol according to the system parameter configuration, and output the time domain OFDM symbol after the CP is removed.
  • the time domain correction module 3 obtains the time domain OFDM symbol output by the CP removal module 2 after the CP is removed.
  • the FFT module 4 is used to perform FFT transformation on the time domain OFDM symbols output by the time domain correction module 3 to obtain frequency domain OFDM symbols; that is, the input end of the FFT module 4 is connected to the output end of the time domain correction module 3, and can Perform time-frequency domain transformation on the received time-domain OFDM symbols.
  • the FFT module can convert the sampling points of the time-domain OFDM symbols Transform from time domain to frequency domain to get frequency domain OFDM symbols
  • N represents the total number of sampling points in the OFDM symbol
  • the PRS extraction module 5 is used to extract from the frequency domain OFDM symbols output by the FFT module 4 to obtain the PRS frequency domain signal corresponding to the terminal serving cell. That is, the input end of the PRS extraction module 5 is connected to the output end of the FFT module 4. At this time, because the acquisition and measurement of the carrier phase are based on the PRS signal, and the PRS signals of different cells have different subcarrier distribution positions in the frequency domain, the PRS The extraction module 5 can output the frequency domain OFDM symbols from the FFT module 4 according to the system configuration parameters Extract the frequency domain signal of the PRS signal corresponding to the service cell of the terminal, that is, the PRS frequency domain signal k represents the subcarrier number corresponding to the PRS frequency domain signal.
  • the frequency domain correction module 6 receives the PRS frequency domain signal output by the PRS extraction module 5, and inputs the PRS frequency domain signal to the phase detector module 7.
  • the phase detector module 7 obtains the PRS frequency domain signal and the pre-acquired PRS frequency domain signal.
  • the calculation method of the phase difference can be referred to the above-mentioned embodiment, which will not be repeated here.
  • the phase detector module 7 inputs the obtained phase difference to the frequency domain phase update module 8.
  • the frequency domain phase update module 8 obtains a frequency domain phase compensation value based on the phase difference, wherein the frequency domain phase compensation value is calculated Refer to the foregoing embodiment for the calculation method of, and will not be repeated here.
  • the frequency domain phase update module 8 inputs the calculated frequency domain phase compensation value to the frequency domain correction module 6.
  • the frequency domain correction module 6 performs phase compensation on the PRS frequency domain signal based on the frequency domain phase compensation value, thereby It realizes the phase tracking of the OFDM in line with the sub-carrier level, and solves the multi-carrier phase tracking problem of the OFDM system.
  • the frequency domain phase update module 8 inputs the calculated frequency domain phase compensation value to the inter-symbol phase shift calculation module 9.
  • the inter-symbol phase shift calculation module 9 is based on the frequency domain phase compensation value output by the frequency domain phase update module 8. , Fit the sub-carriers in the PRS frequency domain signal, and determine the phase value of the first sub-carrier after fitting as the inter-symbol phase shift in the time domain, thereby reducing noise interference.
  • the inter-symbol phase shift calculation module 9 inputs the time-domain inter-symbol phase shift to the time-domain phase update module 10.
  • the time-domain phase update module 10 obtains the time-domain phase compensation value based on the time-domain inter-symbol phase shift, where For the specific manner of obtaining the time-domain phase compensation value based on the phase shift between the time-domain symbols, refer to the foregoing embodiment, and will not be repeated here.
  • the time domain phase update module 10 inputs the time domain phase compensation value to the time domain correction module 3.
  • the time domain correction module 3 is based on the time domain phase compensation value for the time domain OFDM symbol output by the time domain phase update module 10,
  • the phase compensation is performed on the acquired time domain OFDM symbols, that is, the phase tracking of each OFDM symbol is realized.
  • the specific manner of performing phase compensation for the time domain OFDM symbol can refer to the above-mentioned embodiment, which will not be repeated here.
  • the phase detector module 7 also inputs the calculated phase difference to the frequency domain phase measurement module 11.
  • the frequency domain phase measurement module 11 obtains the frequency domain phase measurement value based on the phase difference, thereby realizing no The difference tracks the change of the actual phase in the frequency domain; wherein, for the specific manner of obtaining the frequency domain phase measurement value based on the phase difference, refer to the above-mentioned embodiment, which will not be repeated here.
  • the time-domain phase update module 10 also obtains no fixed phase difference in the time domain based on the time-domain phase compensation value, thereby achieving the ability to track the actual phase change in the time domain without difference; wherein the time-domain phase compensation value is based on the time domain phase compensation value. For the specific manner, refer to the above-mentioned embodiment, which will not be repeated here.
  • the time domain phase update module 10 inputs the obtained time domain no fixed phase difference to the carrier phase synthesis module 12, and the frequency domain phase measurement module 11 inputs the frequency domain phase measurement value to the carrier phase synthesis module 12; at this time, the carrier phase
  • the synthesis module 12 obtains the carrier phase based on the time domain non-fixed phase difference output by the time domain phase updating module 10 and the frequency domain phase measurement value output by the frequency domain phase measurement module 11.
  • the actual phase change in the time domain can be tracked without difference, and the frequency-domain phase measurement value output by the frequency-domain phase measurement module 11 can track the actual phase change in the frequency domain without difference, thereby Therefore, the carrier phase obtained by the carrier phase synthesis module 12 can track the change of the input signal phase without phase difference.
  • the carrier phase obtained by the carrier phase synthesis module 12 can track the change of the input signal phase without phase difference.
  • this is a block diagram of a carrier phase tracking device in an embodiment of the application, and the device includes:
  • the first obtaining module 301 is configured to obtain a time domain orthogonal frequency division multiplexing OFDM symbol, and obtain a positioning reference signal PRS frequency domain signal corresponding to a terminal serving cell based on the time domain OFDM symbol;
  • the first phase compensation module 302 is configured to obtain a frequency domain phase compensation value based on the PRS frequency domain signal, and perform phase compensation on the PRS frequency domain signal through the frequency domain phase compensation value;
  • the second phase compensation module 303 is configured to obtain a time domain phase compensation value based on the frequency domain phase compensation value, and perform phase compensation on the time domain OFDM symbol through the time domain phase compensation value.
  • the device in this embodiment can implement all the method steps of the above method embodiment and can achieve the same beneficial effects.
  • the same steps and beneficial effects in the device and the method embodiments will not be performed here. Go into details.
  • the electronic device may include: a processor 410, a communication interface 420, a memory (memory) 430, and a communication interface.
  • the bus 440 wherein the processor 410, the communication interface 420, and the memory 430 communicate with each other through the communication bus 440.
  • the processor 410 may call a computer program stored on the memory 430 and run on the processor 410 to perform the following steps: obtain a time-domain orthogonal frequency division multiplexing OFDM symbol, and obtain a terminal serving cell based on the time-domain OFDM symbol Corresponding positioning reference signal PRS frequency domain signal; obtain a frequency domain phase compensation value based on the PRS frequency domain signal, and perform phase compensation on the PRS frequency domain signal through the frequency domain phase compensation value; based on the frequency domain phase compensation Value to obtain a time-domain phase compensation value, and perform phase compensation on the time-domain OFDM symbol through the time-domain phase compensation value.
  • the obtaining a frequency domain phase compensation value based on a PRS frequency domain signal includes: obtaining a phase difference between the PRS frequency domain signal and a pre-acquired base station side PRS frequency domain signal; and obtaining based on the phase difference The frequency domain phase compensation value.
  • the acquiring the phase difference between the PRS frequency domain signal and the pre-acquired base station-side PRS frequency domain signal includes: calculating the phase difference through the following formula:
  • k represents the number of the subcarrier corresponding to the PRS frequency domain signal
  • k 0 represents the number of the starting subcarrier corresponding to the PRS frequency domain signal
  • the obtaining the frequency domain phase compensation value based on the phase difference includes: calculating the frequency domain phase compensation value based on the phase difference through the following formula:
  • the performing phase compensation on the PRS frequency domain signal by using the frequency domain phase compensation value includes: for the starting subcarrier in the PRS frequency domain signal, based on the corresponding starting subcarrier The frequency domain phase compensation value of the PRS frequency domain signal corresponding to the starting subcarrier is phase compensated; for the subcarriers in the PRS frequency domain signal other than the starting subcarrier, based on the previous subcarrier The frequency domain phase compensation value corresponding to the adjacent sub-carrier is phase compensation for the PRS frequency domain signal corresponding to the sub-carrier.
  • the obtaining a time-domain phase compensation value based on the frequency-domain phase compensation value includes: obtaining a time-domain inter-symbol phase shift based on the frequency-domain phase compensation value; obtaining a time-domain inter-symbol phase shift based on the time-domain inter-symbol phase shift The time domain phase compensation value.
  • the obtaining a time-domain inter-symbol phase shift based on the frequency-domain phase compensation value includes: fitting subcarriers in the PRS frequency-domain signal based on the frequency-domain phase compensation value, and combining the simulation The phase value of the first subcarrier after the combination is determined as the inter-symbol phase shift in the time domain.
  • the obtaining the time domain phase compensation value based on the time domain inter-symbol phase shift includes: calculating the time domain phase compensation value based on the time domain inter-symbol phase shift through the following formula :
  • M represents the time-domain OFDM symbol time domain phase compensation value
  • m is the number of the time domain OFDM symbol
  • S m denotes a time domain symbol between the m-th time domain OFDM symbol phase shift
  • a t greater than zero and less than the second predetermined factor is equal to 1.
  • the performing phase compensation on the time domain OFDM symbol using the time domain phase compensation value includes: performing phase compensation on the time domain OFDM symbol using the time domain phase compensation value and the following formula compensate:
  • the electronic device in this embodiment can implement all the method steps of the above method embodiment and can achieve the same beneficial effects.
  • the same steps and benefits in the electronic device as in the method embodiment are no longer provided here. The effect will be described in detail.
  • the aforementioned logic instructions in the memory 430 may be implemented in the form of software functional units and when sold or used as independent products, they may be stored in a computer readable storage medium.
  • the technical solution of the present application essentially or the part that contributes to the existing technology or the part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including several
  • the instructions are used to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute all or part of the steps of the methods described in the various embodiments of the present application.
  • the aforementioned storage media include: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disks or optical disks and other media that can store program codes. .
  • the embodiments of the present application also provide a non-transitory computer-readable storage medium on which a computer program is stored, and when the computer program is executed by a processor, the steps provided in the foregoing embodiments are implemented.
  • the device embodiments described above are merely illustrative.
  • 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 it can be distributed to multiple network units.
  • Some or all of the modules can be selected according to actual needs to achieve the objectives of the solutions of the embodiments. Those of ordinary skill in the art can understand and implement it without creative work.
  • each implementation manner can be implemented by software plus a necessary general hardware platform, and of course, it can also be implemented by hardware.
  • the above technical solution essentially or the part that contributes to the existing technology can be embodied in the form of a computer software product, which can be stored in a computer-readable storage medium, such as ROM/RAM, A magnetic disk, an optical disk, etc., include several instructions to make a computer device (which may be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiment.

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  • Signal Processing (AREA)
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Abstract

L'invention concerne un procédé et un appareil de suivi de phase de porteuse. Le procédé consiste à : acquérir un symbole de multiplexage par répartition orthogonale de la fréquence (OFDM) de domaine temporel et acquérir, sur la base du symbole OFDM de domaine temporel, un signal de domaine fréquentiel de signal de référence de positionnement (PRS) correspondant à une cellule de service de terminal ; acquérir une valeur de compensation de phase de domaine fréquentiel sur la base du signal de domaine fréquentiel PRS, et exécuter une compensation de phase sur le signal de domaine fréquentiel PRS par le biais de la valeur de compensation de phase de domaine fréquentiel ; et obtenir une valeur de compensation de phase de domaine temporel sur la base de la valeur de compensation de phase de domaine fréquentiel, et exécuter une compensation de phase sur le symbole OFDM de domaine temporel par le biais de la valeur de compensation de phase de domaine temporel. Les modes de réalisation de la présente invention résolvent le problème de suivi de phase de porteuses multiples d'un système OFDM.
PCT/CN2021/071065 2020-01-16 2021-01-11 Procédé et appareil de suivi de phase de porteuse WO2021143644A1 (fr)

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