WO2015139590A1 - Procédé et dispositif d'estimation et de compensation de décalage de fréquence - Google Patents

Procédé et dispositif d'estimation et de compensation de décalage de fréquence Download PDF

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Publication number
WO2015139590A1
WO2015139590A1 PCT/CN2015/074292 CN2015074292W WO2015139590A1 WO 2015139590 A1 WO2015139590 A1 WO 2015139590A1 CN 2015074292 W CN2015074292 W CN 2015074292W WO 2015139590 A1 WO2015139590 A1 WO 2015139590A1
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Prior art keywords
frequency offset
signal
pilot
offset estimation
estimation
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PCT/CN2015/074292
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English (en)
Chinese (zh)
Inventor
张亚文
刘龙
李琼
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电信科学技术研究院
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Publication of WO2015139590A1 publication Critical patent/WO2015139590A1/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
    • H04L27/2689—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation
    • H04L27/2695—Link with other circuits, i.e. special connections between synchronisation arrangements and other circuits for achieving synchronisation with channel estimation, e.g. determination of delay spread, derivative or peak tracking
    • 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
    • H04L27/2657—Carrier synchronisation
    • 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
    • H04L27/2681—Details of algorithms characterised by constraints
    • H04L27/2682—Precision
    • 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
    • H04L27/2681—Details of algorithms characterised by constraints
    • H04L27/2686—Range of frequencies or delays tested

Definitions

  • the present invention relates to the field of wireless communication technologies, and in particular, to a method and apparatus for frequency offset estimation and compensation.
  • the high-speed railway currently operates at a speed of 300 kilometers per hour (km/h) and may develop to 500km/h in the future.
  • High-speed railway has obvious characteristics: high train running speed, long running distance and complicated geographical environment.
  • existing cellular mobile communication technologies will be limited, the quality of voice communication services will be greatly reduced, and even information islands in high-speed railway environments will emerge.
  • OFDM Orthogonal Frequency Division Multiplexing
  • the existing frequency offset estimation method is to perform frequency offset estimation by frequency domain pilot channel estimation correlation.
  • the pilot signal interval of two time slots in the same subframe is 0.5 ms.
  • the pilot channel estimation difference for each time slot is only caused by the Doppler frequency offset.
  • the frequency offset estimation can be performed by the difference of the pilot channel estimates of the two slots.
  • the formula for the frequency offset estimation is as follows:
  • H 1 represents a frequency domain pilot channel estimate of a previous time slot in the subframe
  • H 2 represents a frequency domain pilot channel estimate of a subsequent time slot in the subframe
  • N sc represents a length of the pilot channel estimation sequence
  • ⁇ t represents the time interval of the pilot signals of two time slots
  • the value of ⁇ t is 0.5 ms.
  • the phase difference of the pilot signals representing the two slots, and angle(*) is a function of the phase.
  • the calculated phase difference ⁇ can only be distinguished within the range of 2 ⁇ .
  • the range of values of ⁇ is limited to (- ⁇ , ⁇ ), and the phase difference exceeding this range is estimated to be a corresponding value of the periodic cycle in the range of (- ⁇ , ⁇ ). Therefore, according to the formula
  • the calculated frequency offset estimation result f d can only be distinguished within the range of 2000 Hz. Taking the value range of ⁇ (- ⁇ , ⁇ ) as an example, the frequency offset estimation range is (-1000Hz, 1000Hz). When the Doppler frequency offset exceeds this range, it is limited by the phase difference period cycle and cannot be accurate. Estimate the correct frequency offset result.
  • the existing frequency offset estimation method is not suitable for a high speed railway environment.
  • a method of frequency offset estimation and compensation comprising:
  • the first frequency offset estimation can obtain a larger frequency offset range.
  • a second frequency offset estimation is then performed by pilot channel estimation of the pilot symbols of the two slots to compensate for the results of the first frequency offset estimation.
  • the signal is obtained from a timing position of at least one OFDM symbol in the subframe in which the received signal is located and a predetermined offset before the timing position, and the first frequency offset estimation is performed by using the acquired signal, specifically by the following manner achieve:
  • the first frequency offset estimation is performed according to the phase difference.
  • the signal is obtained from a timing position of at least one OFDM symbol in the subframe in which the signal is received and a predetermined offset before the timing position, and the first frequency offset estimation is performed by using the acquired signal, specifically
  • the first frequency offset estimation is performed based on the phase difference.
  • pilot channel estimation is performed on the received signal, and a second frequency offset estimation is performed according to the pilot channel estimation result, and the first frequency offset estimation is performed by using the second frequency offset estimation.
  • the result is compensated, one of the implementations can be:
  • the sum of the first frequency offset estimation result and the second frequency offset estimation result is used as the final frequency offset estimation result.
  • the pilot signal is estimated on the received signal, and the second frequency offset estimation is performed according to the pilot channel estimation result, and the result of the first frequency offset estimation is compensated by the second frequency offset estimation, and the other One implementation can be:
  • the second frequency offset estimation is performed according to the phase difference in which the value range is determined, and the second frequency offset estimation result is finally used.
  • the frequency offset estimation results are obtained.
  • pilot channel estimation is performed on the received signal, and a second frequency offset estimation is performed according to the pilot channel estimation result, and the result of the first frequency offset estimation is compensated by the second frequency offset estimation, where
  • One implementation can be:
  • the frequency offset compensation is performed by an interpolation method according to the pilot channel estimation result of the pilot signal of one slot and the compensated pilot channel estimation result of the pilot signal of another slot.
  • an embodiment of the present invention provides a device for estimating and compensating frequency offset, including:
  • a first frequency offset estimation module configured to acquire a signal from a timing position of at least one OFDM symbol in a subframe in which the received signal is located and a predetermined offset before the timing position, and perform the first frequency offset estimation by using the acquired signal
  • the length of the predetermined offset is less than the cyclic prefix length of the received signal
  • a second frequency offset estimation module configured to perform pilot channel estimation on the received signal, perform a second frequency offset estimation according to the pilot channel estimation result, and perform a first frequency offset estimation result by using the second frequency offset estimation make up.
  • the first frequency offset estimation can obtain a larger frequency offset range.
  • a second frequency offset estimation is then performed by pilot channel estimation of the pilot symbols of the two slots to compensate for the results of the first frequency offset estimation.
  • the first frequency offset estimation module is used to:
  • the first frequency offset estimation is performed based on the phase difference.
  • the first frequency offset estimation module is used to:
  • the first frequency offset estimation is performed based on the phase difference.
  • the second frequency offset estimation module is specifically configured to:
  • the sum of the first frequency offset estimation result and the second frequency offset estimation result is used as the final frequency offset estimation result.
  • the second frequency offset estimation module is specifically configured to:
  • the second frequency offset estimation is performed according to the phase difference in which the value range is determined, and the second frequency offset estimation result is used as the final frequency offset estimation result.
  • the second frequency offset estimation module is specifically configured to:
  • the frequency offset compensation is performed by an interpolation method according to the pilot channel estimation result of the pilot signal of one slot and the compensated pilot channel estimation result of the pilot signal of another slot.
  • the embodiment of the present invention provides another apparatus for frequency offset estimation and compensation, including:
  • a processor configured to execute a computer program that acquires a signal from a timing position of at least one OFDM symbol in a subframe in which the received signal is located and a predetermined offset before the timing position, and utilizes the acquired
  • the signal performs a first frequency offset estimation, the length of the predetermined offset is not greater than the cyclic prefix length of the received signal; the pilot channel is estimated for the received signal, and the second frequency offset estimation is performed according to the pilot channel estimation result,
  • the secondary frequency offset estimation compensates for the result of the first frequency offset estimation;
  • a memory configured to hold code of the above computer program.
  • the first frequency offset estimation can obtain a larger frequency offset range.
  • a second frequency offset estimation is then performed by pilot channel estimation of the pilot symbols of the two slots to compensate for the results of the first frequency offset estimation.
  • FIG. 1 is a flowchart of a method according to an embodiment of the present invention
  • FIG. 2 is a schematic diagram of a device according to an embodiment of the present invention.
  • FIG. 3 is a schematic diagram of another apparatus provided by the implementation of the present invention.
  • GSM Global System of Mobile communication
  • CDMA Code Division Multiple Access
  • WCDMA Wideband Code Division Multiple Access
  • GPRS General Packet Radio Service
  • LTE Long Term Evolution
  • LTE-A Advanced Long Term Evolution
  • UMTS Universal Mobile Telecommunication System
  • the user equipment includes but is not limited to a mobile station (Mobile Station, MS), a mobile terminal (Mobile Terminal), a mobile phone (Mobile Telephone), a mobile phone (handset). And portable devices, etc., the user equipment can communicate with one or more core networks via a Radio Access Network (RAN), for example, the user equipment can be a mobile phone (or "cellular"
  • RAN Radio Access Network
  • the user equipment can be a mobile phone (or "cellular"
  • the telephone device, the computer with wireless communication function, etc., the user equipment can also be a mobile device that is portable, pocket-sized, handheld, built-in, or in-vehicle.
  • a base station may refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface.
  • the base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network.
  • IP Internet Protocol
  • the base station can also coordinate attribute management of the air interface.
  • the base station may be a Base Transceiver Station (BTS) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station in LTE (NodeB or eNB or e-NodeB, evolutional Node B), the invention is not limited.
  • BTS Base Transceiver Station
  • NodeB base station
  • NodeB evolved base station
  • LTE Long Term Evolutional Node B
  • Embodiments of the present invention provide an implementation scheme of frequency offset estimation and compensation with a larger estimation range.
  • the frequency offset is first estimated by the received signal including the cyclic prefix (CP), and in the channel estimation phase, two time slots are reused. Pilot channel estimation, second estimation or compensation of the frequency offset.
  • CP cyclic prefix
  • the frequency offset estimation and compensation method provided by the embodiment of the present invention is as shown in FIG. 1 , and specifically includes the following operations:
  • Step 100 Acquire a signal from a timing position of at least one OFDM symbol in a subframe in which the signal is received and a predetermined offset before the timing position, and perform first frequency offset estimation using the acquired signal, and the predetermined offset
  • the length is not greater than the CP length of the received signal.
  • Step 110 Perform pilot channel estimation on the received signal, perform a second frequency offset estimation according to the pilot channel estimation result, and compensate the first frequency offset estimation result by using the second frequency offset estimation.
  • the first frequency offset estimation can obtain a larger frequency offset range.
  • a second frequency offset estimation is then performed by pilot channel estimation of the pilot symbols of the two slots to compensate for the results of the first frequency offset estimation.
  • step 100 there are various implementations of step 100 in the embodiment of the present invention, and two preferred implementations are exemplified below.
  • step 100 A preferred implementation of step 100 is as follows:
  • the specific implementation manner of acquiring the frequency domain received signal may be: acquiring an OFDM symbol from a timing position of the OFDM symbol where the at least one pilot signal in the subframe is located and a predetermined offset before the timing position; The OFDM symbol is subjected to FFT transform to obtain a frequency domain signal; and the frequency domain received signal (ie, the signal transmitted by the transmitting end) is obtained from the acquired frequency domain signal according to the frequency domain resource position occupied by the transmitting end of the received signal.
  • the frequency domain receiving signal is obtained from the obtained frequency domain signal, specifically: in the frequency domain signal, the signal of the remaining position except the frequency domain resource position occupied by the receiving signal receiving end is set to zero, and the frequency domain receiving signal is obtained.
  • the length of ⁇ n is greater than 0, and is not greater than the length of the CP of the received signal.
  • the specific value may be determined according to actual conditions, and it is required to ensure that the intercepted OFDM symbol does not include the delayed signal of the previous OFDM symbol.
  • the signal of the remaining frequency position other than the frequency domain resource position of the receiving signal in the obtained frequency domain signal S is zeroed to obtain the frequency domain receiving signal.
  • the obtained frequency domain signal S f2 is zeroed at a signal other than the frequency domain resource position of the receiving signal receiving end, and the frequency domain receiving signal is obtained.
  • Ts 1 / frequency domain sampling interval * N FFT .
  • N FFT is the sequence length for performing FFT transform.
  • the first frequency offset estimation is performed based on the OFDM symbol in which the two pilot signals are located on the single antenna
  • the first frequency offset estimation is performed based on the OFDM symbol in which the single pilot signal is located on the multiple antennas, or based on the two antennas on the multiple antennas
  • the OFDM symbol in which the frequency signal is located performs the first frequency offset estimation, and may refer to the processing procedure of the OFDM symbol in which the pilot signal of the single antenna is located. But in calculating the phase difference When the phase difference obtained on each antenna and each OFDM symbol is averaged, the phase difference used for the first frequency offset estimation is obtained.
  • the frequency domain received signals obtained by the timing positions of the antennas and the OFDM symbols may be averaged, and the frequency domain received signals acquired at the ⁇ n point before the timing positions of the antennas and the OFDM symbols are averaged, and the phase is calculated using the average result. difference Other ways to determine the phase difference The invention is not limited thereto.
  • step 100 The preferred implementation of step 100 is as follows:
  • the specific implementation manner of acquiring the time domain received signal may be: acquiring an OFDM symbol from a timing position of at least one OFDM symbol in the subframe and a predetermined offset before the timing position; performing FFT transformation on the acquired OFDM symbol Obtaining a frequency domain signal, and obtaining, according to the frequency domain resource position occupied by the transmitting end of the receiving signal, a signal transmitted by the transmitting end from a frequency domain signal obtained by the timing position of the OFDM symbol and a predetermined offset before the timing position; The timing position of the OFDM symbol and the signal transmitted by the transmitting end at a predetermined offset before the timing position are converted into a time domain signal.
  • the signal of the remaining position other than the frequency domain resource position of the receiving signal receiving end of the received frequency domain signal S f1 is zeroed to obtain the frequency domain receiving signal.
  • the obtained frequency domain signal S f2 is zeroed at a signal other than the frequency domain resource position of the signal receiving end of the receiving signal to obtain a frequency domain receiving signal.
  • Ts 1 / frequency domain sampling interval * N FFT .
  • the first frequency offset estimation is performed based on the OFDM symbol in which the two pilot signals are located on the single antenna
  • the first frequency offset estimation is performed based on the OFDM symbol in which the single pilot signal is located on the multiple antennas, or based on the two antennas on the multiple antennas
  • the OFDM symbol in which the frequency signal is located performs the first frequency offset estimation, and may refer to the processing procedure of the OFDM symbol in which the pilot signal of the single antenna is located. But in calculating the phase difference When the phase difference obtained on each antenna and each OFDM symbol is averaged, the phase difference used for the first frequency offset estimation is obtained.
  • the frequency domain received signals obtained by the timing positions of the antennas and the OFDM symbols may be averaged, and the frequency domain received signals acquired at the ⁇ n point before the timing positions of the antennas and the OFDM symbols are averaged, and the phase is calculated using the average result. difference Other ways to determine the phase difference The invention is not limited thereto.
  • step 110 in the embodiment of the present invention is various, and two preferred implementations are exemplified below.
  • step 110 is as follows:
  • pilot channel estimation on the pilot signals of the two slots in the foregoing subframe using the result of the first frequency offset estimation to compensate the pilot channel estimation result of the pilot signal of one of the slots; according to a time slot
  • the pilot channel estimation result of the pilot signal and the compensated pilot channel estimation result of the pilot signal of another time slot perform a second frequency offset estimation; the first frequency offset estimation result and the second frequency offset
  • the sum of the estimated results is used as the final frequency offset estimation result.
  • pilot channel of the two slots of the foregoing subframe is subjected to pilot channel estimation, that is, pilot channel estimation is performed on the received signal.
  • the result of the first frequency offset estimation is corrected by the second frequency offset estimation, and the final frequency offset estimation result is obtained, that is, the second frequency offset estimation result is summed with the first frequency offset estimation result, and the And the result as the final frequency offset Estimated results.
  • f d,h is the second frequency offset estimation result
  • ⁇ t is the time interval of the pilot signals of two time slots, the specific value is 0.5 milliseconds
  • N sc is the length of the pilot channel estimation sequence
  • H slot1 ( n) the nth element of the pilot channel estimation result (sequence) H slot1 of the pilot signal of the previous time slot of the above subframe
  • H slot 2 (n) is the nth element of the pilot channel estimation result (sequence) H slot 2 of the pilot signal of the subsequent slot of the above subframe
  • Indicates that the first frequency offset estimation result f d is used, and CP compensates H slot 2 (n).
  • the above formula illustrates the use of the first frequency offset estimation result to compensate the pilot channel estimation result of the pilot signal of the subsequent time slot of the foregoing subframe as an example. It should be noted that the first frequency offset may also be used.
  • the estimation result compensates for the pilot channel estimation result of the pilot signal of the previous slot of the above subframe.
  • the second frequency offset estimation result is averaged, and then the averaged result is compared with the first frequency offset estimation result. As a result of the final frequency offset estimation.
  • step 110 is as follows:
  • pilot channel estimation on the pilot signals of the two slots in the foregoing subframe using the result of the first frequency offset estimation to compensate the pilot channel estimation result of the pilot signal of one of the slots; according to a time slot
  • the pilot channel estimation result of the pilot signal and the compensated pilot channel estimation result of the pilot signal of another time slot are subjected to frequency offset compensation by an interpolation method.
  • Pilot channel estimation is performed on pilot signals of two slots in the above subframe; using the result f d of the first frequency offset estimation , the CP compensates the pilot channel estimation result of the pilot signal of one of the slots. For example, the pilot channel estimation result H slot2 of the latter time slot is compensated for the frequency offset f d, CP , and the compensated channel estimation result is obtained.
  • the channel estimation result on all OFDM symbols in the latter slot is inversely compensated for the frequency offset f d, CP , Get the final channel estimate It includes further estimates and compensation for the Doppler shift.
  • the Doppler frequency offset to be compensated is f d, CP .
  • the CP determines the range of the phase difference of the pilot signals of the two time slots; performs the second frequency offset estimation according to the phase difference of the determined value range, and uses the second frequency offset estimation result as the final frequency offset estimation result.
  • the pilot channel estimation is performed on the pilot signals of the two slots in the foregoing subframe, and the principle of determining the phase difference of the pilot signals of the two slots according to the pilot channel estimation result is as follows:
  • ⁇ is the phase difference of the pilot signals of two time slots, and other parameters are explained by referring to the foregoing formula.
  • the phase difference of the pilot signals of the two time slots may be determined according to the pilot channel estimation result, and then the range of the phase difference is determined, and the phase difference is corrected according to the determined value range, and the phase difference is performed according to the corrected phase difference.
  • the phase difference of the pilot signals of the two time slots may be determined according to the result of the first frequency offset estimation, and then the phase difference is determined according to the value range and the pilot channel estimation result, according to the determined phase difference. Perform a second frequency offset estimation. For example, if the first frequency offset estimation result is 1350 Hz, and the determined phase difference has a value range of ⁇ 2 ⁇ , then the phase difference is determined to be 1.2 ⁇ .
  • the embodiment of the present invention provides a device for estimating and compensating for frequency offset, as shown in FIG. 2, including:
  • the first frequency offset estimation module 201 is configured to acquire a signal from a timing position of the at least one OFDM symbol in the subframe where the received signal is located and a predetermined offset before the timing position, and perform the first frequency offset by using the acquired signal. Estimating that the length of the predetermined offset is less than the cyclic prefix length of the received signal;
  • the second frequency offset estimation module 202 is configured to perform pilot channel estimation on the received signal, and estimate the junction according to the pilot channel. If the second frequency offset estimation is performed, the result of the first frequency offset estimation is compensated by the second frequency offset estimation.
  • the first frequency offset estimation can obtain a larger frequency offset range.
  • a second frequency offset estimation is then performed by pilot channel estimation of the pilot symbols of the two slots to compensate for the results of the first frequency offset estimation.
  • the first frequency offset estimation module 201 is configured to:
  • the first frequency offset estimation is performed based on the phase difference.
  • the first frequency offset estimation module 201 is configured to:
  • the first frequency offset estimation is performed based on the phase difference.
  • the second frequency offset estimation module 202 is specifically configured to:
  • the sum of the first frequency offset estimation result and the second frequency offset estimation result is used as the final frequency offset estimation result.
  • the second frequency offset estimation module 202 is specifically configured to:
  • the second frequency offset estimation is performed according to the phase difference in which the value range is determined, and the second frequency offset estimation result is used as the final frequency offset estimation result.
  • the second frequency offset estimation module 202 is specifically configured to:
  • the frequency offset compensation is performed by an interpolation method according to the pilot channel estimation result of the pilot signal of one slot and the compensated pilot channel estimation result of the pilot signal of another slot.
  • the embodiment of the present invention provides another device for frequency offset estimation and compensation, as shown in FIG. 3, including:
  • the processor 301 is configured to execute a computer program having the following functions: acquiring a signal from a timing position of at least one OFDM symbol in a subframe in which the signal is received and a predetermined offset before the timing position, and utilizing The acquired signal performs a first frequency offset estimation, the length of the predetermined offset is smaller than the cyclic prefix length of the received signal; the pilot channel is estimated for the received signal, and the second frequency offset estimation is performed according to the pilot channel estimation result, The second frequency offset estimation compensates for the result of the first frequency offset estimation;
  • Memory 302 which is configured to hold the code of the above computer program.
  • the first frequency offset estimation can obtain a larger frequency offset range.
  • a second frequency offset estimation is then performed by pilot channel estimation of the pilot symbols of the two slots to compensate for the results of the first frequency offset estimation.
  • embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.
  • computer-usable storage media including but not limited to disk storage, CD-ROM, optical storage, etc.
  • These computer program instructions can also be stored in a particular computer capable of booting a computer or other programmable data processing device In a computer readable memory that operates in a computer readable memory, causing instructions stored in the computer readable memory to produce an article of manufacture comprising instruction means implemented in a block or in a flow or a flow diagram and/or block diagram of the flowchart The functions specified in the boxes.
  • These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device.
  • the instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Synchronisation In Digital Transmission Systems (AREA)

Abstract

L'invention concerne un procédé et un dispositif d'estimation et de compensation de décalage de fréquence. Le procédé consiste à : obtenir des signaux, d'une position de synchronisation d'au moins un symbole OFDM (multiplexage par répartition orthogonale de la fréquence), et d'une position de décalage prédéfinie précédant la position de synchronisation dans une sous-trame de signaux reçus ; utiliser les signaux obtenus pour exécuter une première estimation de décalage de fréquence, la longueur du décalage prédéterminé n'étant pas supérieure à la longueur de préfixe cyclique des signaux reçus ; exécuter une estimation de canal pilote sur les signaux reçus ; d'après le résultat de l'évaluation du canal pilote, exécuter une seconde estimation de décalage de fréquence ; et compenser le résultat de la première estimation de décalage de fréquence par la seconde estimation de décalage de fréquence. La solution technique fournie dans un mode de réalisation de la présente invention permet d'estimer avec une meilleure précision un décalage de fréquence. Elle est adaptée à un usage sur des autoroutes et des voies ferrées à grande vitesse.
PCT/CN2015/074292 2014-03-21 2015-03-16 Procédé et dispositif d'estimation et de compensation de décalage de fréquence WO2015139590A1 (fr)

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CN109274619B (zh) * 2017-07-18 2020-10-20 电信科学技术研究院 一种频率偏移确定方法及装置
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