WO2014187231A1 - 一种信号解调方法及装置 - Google Patents

一种信号解调方法及装置 Download PDF

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Publication number
WO2014187231A1
WO2014187231A1 PCT/CN2014/076514 CN2014076514W WO2014187231A1 WO 2014187231 A1 WO2014187231 A1 WO 2014187231A1 CN 2014076514 W CN2014076514 W CN 2014076514W WO 2014187231 A1 WO2014187231 A1 WO 2014187231A1
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WO
WIPO (PCT)
Prior art keywords
frequency offset
offset value
mobile terminal
clock signal
doppler frequency
Prior art date
Application number
PCT/CN2014/076514
Other languages
English (en)
French (fr)
Inventor
王向东
吴正海
郭峰
Original Assignee
小米科技有限责任公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 小米科技有限责任公司 filed Critical 小米科技有限责任公司
Priority to BR112015014184A priority Critical patent/BR112015014184A2/pt
Priority to EP14800268.6A priority patent/EP3001621B1/en
Priority to JP2015543307A priority patent/JP6096919B2/ja
Priority to RU2015128654A priority patent/RU2607638C1/ru
Priority to KR1020157013497A priority patent/KR101715799B1/ko
Priority to IN4051DEN2015 priority patent/IN2015DN04051A/en
Priority to MX2015007308A priority patent/MX346064B/es
Publication of WO2014187231A1 publication Critical patent/WO2014187231A1/zh
Priority to US14/946,987 priority patent/US9712974B2/en

Links

Classifications

    • 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
    • G01S11/00—Systems for determining distance or velocity not using reflection or reradiation
    • G01S11/02—Systems for determining distance or velocity not using reflection or reradiation using radio waves
    • G01S11/10—Systems for determining distance or velocity not using reflection or reradiation using radio waves using Doppler effect
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/025—Services making use of location information using location based information parameters
    • H04W4/027—Services making use of location information using location based information parameters using movement velocity, acceleration information
    • 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
    • G01S19/38—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system
    • G01S19/39—Determining a navigation solution using signals transmitted by a satellite radio beacon positioning system the satellite radio beacon positioning system transmitting time-stamped messages, e.g. GPS [Global Positioning System], GLONASS [Global Orbiting Navigation Satellite System] or GALILEO
    • G01S19/52—Determining velocity
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W56/00—Synchronisation arrangements
    • H04W56/0035—Synchronisation arrangements detecting errors in frequency or phase
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0024—Carrier regulation at the receiver end
    • H04L2027/0026—Correction of carrier offset
    • H04L2027/0036—Correction of carrier offset using a recovered symbol clock
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0044—Control loops for carrier regulation
    • H04L2027/0046—Open loops
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/0014—Carrier regulation
    • H04L2027/0083—Signalling arrangements

Definitions

  • the present disclosure relates to mobile terminal development technologies, and in particular, to a signal demodulation method and apparatus. Background technique
  • the communication rate has always been highly valued by the user.
  • a Doppler shift occurs.
  • the mobile speed of the user is fast, the mobile terminal has a large Doppler shift when receiving the signal sent by the base station, that is, the difference between the frequency of the received signal and the frequency of the signal actually transmitted by the base station. That is, the Doppler frequency offset value is large, which affects the accuracy of the radio frequency demodulation of the communication system, and affects the data throughput rate of the base station communication. This results in a slower communication rate.
  • the circuit diagrams of the Global Positioning System (GPS) and WCDMA demodulation devices of the mobile terminal are shown in Figure 1, GPS and WCDMA.
  • the signal processing module is provided by a transceiver to provide radio frequency demodulation, and the baseband signal is sent to a baseband processor for processing, and then the baseband processor informs the application (application process, AP) / Central Processing Unit (CPU).
  • the transiver in Figure 1 requires a reference clock signal for demodulation during demodulation.
  • the reference clock signal is supplied by a Power Supply Management Unit (PMU), which transduces WCDMA or other RF signals based on the reference clock signal.
  • PMU Power Supply Management Unit
  • the value of the reference clock signal determines the demodulation accuracy of the transiver.
  • the demodulation accuracy is high, and the throughput of the mobile terminal and the base station is also high, and the communication rate of the corresponding communication system is also large.
  • the RF signal is demodulated according to the reference clock signal provided by the PMU without considering the influence of the Doppler shift on the RF demodulation. When the moving speed is fast, the accuracy of the radio frequency demodulation is low, which may cause the communication speed to be too slow.
  • Embodiments of the present disclosure provide a signal demodulation method and apparatus to solve the problem that a communication rate is too slow when there is a Doppler shift.
  • a signal demodulation method including:
  • Determining a moving speed of the mobile terminal and determining, according to the moving speed, a Doppler frequency offset value generated when the mobile terminal receives the radio frequency signal transmitted by the base station;
  • a signal demodulating apparatus including:
  • An acquiring unit configured to acquire a reference clock signal provided by the PMU in the mobile terminal
  • a determining unit configured to determine a moving speed of the mobile terminal, and determine, according to the moving speed, a Doppler frequency offset value generated when the mobile terminal receives the radio frequency signal transmitted by the base station;
  • a demodulation unit configured to demodulate the radio frequency signal sent by the received base station according to the reference clock signal and the Doppler frequency offset value.
  • a signal demodulating apparatus including:
  • PMU used to provide a reference clock signal
  • a CA module connected to the PMU, configured to determine a moving speed of the mobile terminal, and determine, according to the moving speed, a Doppler frequency offset value generated when the mobile terminal receives the radio frequency signal transmitted by the base station, and according to the Doppler frequency offset value And a reference clock signal provided by the PMU to determine a demodulation clock signal;
  • the receiver connected to the CA module is configured to obtain a radio frequency signal sent by the base station and a demodulation clock signal determined by the CA module, and demodulate the radio frequency signal sent by the base station according to the demodulation clock signal.
  • a signal demodulating apparatus including:
  • PMU used to provide a reference clock signal
  • a processing unit configured to determine, according to a moving speed determined by the receiver, a Doppler frequency offset value generated when the mobile terminal receives the radio frequency signal transmitted by the base station;
  • a receiver connected to the PMU and the processing unit, configured to determine a moving speed of the mobile terminal, and obtain a radio frequency signal sent by the base station, a reference clock signal provided by the PMU, and a Doppler frequency offset value determined by the processing unit, and according to the reference clock signal
  • the Doppler frequency offset value demodulates the radio frequency signal transmitted by the base station.
  • Embodiments of the present disclosure provide a signal demodulation method and apparatus to reduce the influence of Doppler shift on a communication rate. After demodulating the radio frequency signal sent by the received base station, after acquiring the reference clock signal provided by the PMU, it is also required to determine the moving speed of the mobile terminal, and determine, according to the moving speed, the mobile terminal receives the radio frequency signal transmitted by the base station.
  • the Doppler frequency offset value is used to demodulate the received RF signal transmitted by the base station according to the reference clock signal and the Doppler frequency offset value. Because the effect of Doppler frequency offset is considered when demodulating the RF signal transmitted by the base station, the demodulation precision is high, thereby avoiding the modulation accuracy being lowered and the communication rate being too slow when there is Doppler frequency shift. The problem.
  • FIG. 1 is a schematic structural diagram of a GPS and WCDMA demodulation apparatus according to an exemplary embodiment
  • FIG. 2 is a flowchart of a signal demodulation method according to an exemplary embodiment
  • FIG. 3 is a flowchart of a method for determining a Doppler shift according to an exemplary embodiment.
  • FIG. 4 is a flowchart of a method for determining a Doppler shift according to an exemplary embodiment.
  • FIG. 5 is a flowchart of a method for demodulating according to a reference clock signal and a Doppler frequency offset value according to an exemplary embodiment;
  • FIG. 6 is a flowchart of a preferred demodulation method according to an exemplary embodiment
  • FIG. 7 is a schematic structural diagram of a signal demodulating apparatus according to an exemplary embodiment
  • FIG. 8a is a schematic structural diagram of a determining unit according to an exemplary embodiment
  • FIG. 8b is a second schematic structural diagram of a determining unit according to an exemplary embodiment
  • FIG. 9 is a schematic structural diagram of a demodulation unit according to an exemplary embodiment.
  • FIG. 10 is a second schematic structural diagram of a signal demodulating apparatus according to an exemplary embodiment
  • FIG. 11 is a third schematic structural diagram of a signal demodulating apparatus according to an exemplary embodiment. detailed description
  • Embodiments of the present disclosure provide a signal demodulation method and apparatus to reduce the influence of Doppler shift on a communication rate. After demodulating the radio frequency signal sent by the received base station, after acquiring the reference clock signal provided by the PMU, it is also required to determine the moving speed of the mobile terminal, and determine, according to the moving speed, the mobile terminal receives the radio frequency signal transmitted by the base station.
  • the Doppler frequency offset value is used to demodulate the received RF signal transmitted by the base station according to the reference clock signal and the Doppler frequency offset value.
  • the demodulation precision is high, thereby avoiding the modulation precision being lowered and the communication rate being too slow when there is Doppler frequency shift. problem.
  • an embodiment of the present disclosure provides a signal demodulation method, including:
  • S203 Demodulate the radio frequency signal sent by the received base station according to the reference clock signal and the Doppler frequency offset value. Before demodulating the radio frequency signal sent by the received base station, acquiring a reference clock signal provided by the PMU, determining a moving speed of the mobile terminal, and determining a Doppler generated when the mobile terminal receives the radio frequency signal transmitted by the base station according to the moving speed.
  • the frequency offset value is used to demodulate the radio frequency signal sent by the base station according to the reference clock signal and the Doppler frequency offset value provided by the PMU, thereby avoiding the Doppler frequency shift. This leads to a problem that the signal demodulation accuracy is lowered and the communication rate is too slow.
  • the embodiment of the present disclosure provides two methods for determining the Doppler frequency offset value according to the moving speed. method.
  • the first type is determined according to the moving speed, when the mobile terminal receives the radio frequency signal transmitted by the base station.
  • the Doppler frequency offset method includes:
  • the two time points set therein can be set by a person skilled in the art.
  • the setting time of the reference clock signal provided by the PMU can be set.
  • two time points can be set as two set reference.
  • the acquisition time of the clock signal, wherein the two set reference clock signals may be two reference clock signals whose acquisition time is closest to the current time.
  • the accuracy of the Doppler frequency offset determined by this method is high, and the accuracy of decoding the radio frequency signal transmitted by the base station according to the Doppler frequency offset value and the reference clock signal is high. Thereby a higher communication rate is obtained.
  • the second method for determining the Doppler frequency offset value according to the moving speed is:
  • S401 Determine, by using a global positioning system (GPS), a speed vector of the mobile terminal at two set time points;
  • GPS global positioning system
  • S402. Determine a modulus value of the difference between the set speed vectors at two time points
  • the modulus value of the difference between the speed vector of the mobile terminal acquired by the GPS at the two time points and the speed vector direction of the mobile terminal acquired by the GPS at the two time points may be determined.
  • the mapping relationship of the range of the angles of the angles, the accuracy of the mapping relationship can be set by the person skilled in the art as needed.
  • Presetting the mapping relationship between the difference between the speed vector of the mobile terminal acquired by the GPS and the speed vector of the mobile terminal acquired by the GPS and setting the angle of the angle between the speed vector directions of the two time points When it is necessary to determine the Doppler frequency offset value, it is only necessary to determine the modulus value of the difference between the speed vector of the mobile terminal acquired by the GPS at two time points and the speed of the mobile terminal acquired by the GPS at two time points.
  • the angle of the vector direction corresponds to the Doppler frequency offset value in the mapping relationship, and the processing amount of the mobile terminal is low.
  • An embodiment of the present disclosure provides a specific method for demodulating a radio frequency signal transmitted by a received base station according to a reference clock signal and a Doppler frequency offset value. As shown in FIG. 5, the method includes:
  • the Doppler frequency offset value may be superimposed with the reference clock signal to determine the demodulation clock signal, and then the RF signal sent by the received base station according to the demodulation clock signal. Demodulation is performed to avoid the low frequency modulation accuracy of the communication system due to the presence of Doppler frequency offset, and the communication rate is too slow.
  • the embodiment of the present disclosure provides a demodulation method. As shown in FIG. 6, the method includes:
  • the Doppler frequency offset value Fd
  • * COS o ⁇ is used to determine a Doppler frequency offset value Fd generated when the mobile terminal receives the radio frequency signal transmitted by the base station, where ⁇ is a radio wavelength;
  • an embodiment of the present disclosure provides a signal demodulating apparatus, including:
  • the obtaining unit 701 is configured to obtain a reference clock signal provided by the PMU in the mobile terminal.
  • the determining unit 702 is configured to determine a moving speed of the mobile terminal, and determine, according to the moving speed, a Doppler frequency offset value generated when the mobile terminal receives the radio frequency signal transmitted by the base station;
  • the demodulation unit 703 is configured to demodulate the radio frequency signal sent by the received base station according to the reference clock signal and the Doppler frequency offset value.
  • the acquiring unit 501 acquires the reference clock signal provided by the PMU, and the determining unit 502 determines the moving speed of the mobile terminal, and determines, according to the moving speed, the mobile terminal receives the transmitting by the base station.
  • the Doppler frequency offset generated by the radio frequency signal is used by the demodulation unit 503 to perform the radio frequency signal transmitted by the base station according to the reference clock signal and the Doppler frequency offset value provided by the PMU when demodulating the radio frequency signal transmitted by the base station.
  • Demodulation avoids the problem that the accuracy of signal demodulation is lowered due to the presence of Doppler shift, and the communication rate is too slow.
  • the embodiment of the present disclosure provides two ways to implement the Doppler frequency offset value according to the moving speed.
  • the first method for determining the Doppler frequency offset value based on the moving speed is:
  • the determining unit 702 includes:
  • a first determining module 801 configured to determine, by using a GPS, a speed vector of the mobile terminal at two set time points;
  • a second determining module 802 configured to determine a modulus value of a difference of the speed vectors of the set two time points
  • a third determining module 803, configured to determine an angle ⁇ of a direction of a velocity vector of the set two time points
  • the two time points set therein can be set by a person skilled in the art.
  • the setting time of the reference clock signal provided by the PMU can be set.
  • two time points can be set as two set reference.
  • the acquisition time of the clock signal, wherein the two set reference clock signals may be two reference clock signals whose acquisition time is closest to the current time.
  • the accuracy of the Doppler frequency offset determined by this method is high, and the Doppler frequency offset value and the reference clock signal can be guaranteed.
  • the accuracy of decoding the radio frequency signal transmitted by the base station is high. Thereby a higher communication rate is obtained.
  • the second method for determining the Doppler frequency offset value according to the moving speed is:
  • the determining unit 702 includes:
  • a first determining module 801 configured to determine, by using a GPS, a speed vector of the mobile terminal at two set time points;
  • a second determining module 802 configured to determine a modulus value of a difference of the speed vectors of the set two time points
  • a third determining module 803, configured to determine an angle ⁇ of a direction of a velocity vector of the set two time points
  • the searching module 805 is configured to search for a Doppler frequency offset value corresponding to the determined
  • the modulus value of the difference between the speed vector of the mobile terminal acquired by the GPS at the two time points and the speed vector direction of the mobile terminal acquired by the GPS at the two time points may be determined.
  • the mapping relationship of the range of the angles of the angles, the accuracy of the mapping relationship can be set by the person skilled in the art as needed.
  • Presetting the mapping relationship between the difference between the speed vector of the mobile terminal acquired by the GPS and the speed vector of the mobile terminal acquired by the GPS and setting the angle of the angle between the speed vector directions of the two time points When it is necessary to determine the Doppler frequency offset value, it is only necessary to determine the modulus value of the difference between the speed vector of the mobile terminal acquired by the GPS at two time points and the speed of the mobile terminal acquired by the GPS at two time points.
  • the angle of the vector direction corresponds to the Doppler frequency offset value in the mapping relationship, and the processing amount of the mobile terminal is low.
  • the demodulation unit 703 includes a superposition module 901, configured to superimpose a reference clock signal and a Doppler frequency offset value to determine a demodulation clock.
  • the signal demodulation module 902 is configured to demodulate the radio frequency signal sent by the received base station according to the demodulation clock signal.
  • the Doppler frequency offset value may be superimposed with the reference clock signal to determine the demodulation clock signal, and then the RF signal sent by the received base station according to the demodulation clock signal.
  • Demodulation is performed to avoid the low frequency modulation accuracy of the communication system due to the presence of Doppler frequency offset, and the communication rate is too slow.
  • an embodiment of the present disclosure provides a signal demodulating apparatus, including:
  • PMU1001 for providing a reference clock signal
  • the CA module 1002 connected to the PMU 1001 is configured to determine a moving speed of the mobile terminal, and determine, according to the moving speed, a Doppler frequency offset value generated when the mobile terminal receives the radio frequency signal transmitted by the base station, and according to the Doppler frequency offset value and The reference clock signal provided by the PMU determines the demodulation clock signal;
  • the receiver 1003 connected to the CA module is configured to obtain a radio frequency signal sent by the base station and a demodulation clock signal determined by the CA module 1002, and demodulate the radio frequency signal sent by the base station according to the demodulation clock signal.
  • the receiver 1003 Before demodulating the radio frequency signal sent by the received base station, the receiver 1003 acquires a reference clock signal provided by the PMU 1001, and determines, by the CA module 1002, the moving speed of the mobile terminal, and determines, according to the moving speed, the mobile terminal receives the base station to transmit.
  • the Doppler shift value generated when the RF signal is generated, and the demodulation clock signal is determined according to the Doppler shift value and the reference clock signal provided by the PMU 1001.
  • the receiver 1003 demodulates the radio frequency signal sent by the base station according to the demodulation clock signal, thereby avoiding the degradation of the signal demodulation due to the presence of the Doppler shift, and the communication rate. The problem is too slow.
  • the disclosed embodiment provides a method.
  • the CA module 1002 determines the Doppler frequency offset value according to the moving speed, which is:
  • ⁇ A ⁇ R a can be determined by GPS.
  • the two time points set therein can be set by the person skilled in the art according to experience.
  • the setting time of the reference clock signal provided by the PMU can be set.
  • two time points can be set for two settings.
  • the acquisition time of the reference clock signal, wherein the two set reference clock signals may be two reference clock signals whose acquisition time is closest to the current time.
  • the accuracy of the Doppler frequency offset determined by this method is high, and the accuracy of decoding the radio frequency signal transmitted by the base station according to the Doppler frequency offset value and the reference clock signal is high. Thereby a higher communication rate is obtained.
  • CA module 1002 can implement the CA module 1002 to determine the Doppler frequency offset value according to the moving speed in other feasible manners.
  • an implementation manner is provided, which will not be described one by one.
  • the CA module 1002 may superimpose the Doppler frequency offset value with the reference clock signal, determine the demodulation clock signal, and send the demodulated clock signal to the received base station according to the demodulation clock signal.
  • the radio frequency signal is demodulated, thereby avoiding the Doppler frequency offset, and the radio frequency modulation precision of the communication system is low, and the communication rate is too slow.
  • the CA module 1002 includes a direct digital frequency synthesizer DDS for superimposing the reference clock signal and the Doppler frequency offset value;
  • the CA module 1002 determines the demodulation clock signal according to the Doppler frequency offset value and the reference clock signal, and is configured to: determine the demodulation clock signal by the DDS superimposed reference clock signal and the Doppler frequency offset value.
  • the GPS-acquired radio frequency signal embodying the moving speed may be coupled to the CA module.
  • the demodulation device provided by the embodiment of the present disclosure further includes: a coupling module connected to the CA module 1002, configured to couple the GPS-acquired radio frequency signal embodying the moving speed into the CA module 1002.
  • an embodiment of the present disclosure further provides a signal demodulating apparatus, including:
  • the PMU 1001 is configured to provide a reference clock signal
  • the processing unit 1004 is configured to determine, according to the moving speed determined by the receiver, a Doppler frequency offset value generated when the mobile terminal receives the radio frequency signal transmitted by the base station;
  • the receiver 1003 connected to the PMU 1001 and the processing unit 1004 is configured to determine a moving speed of the mobile terminal, and acquire a radio frequency signal sent by the base station, the PMU 1001 provides a reference clock signal, and the Doppler determined by the processing unit 1004.
  • the frequency offset value is used to demodulate the radio frequency signal transmitted by the base station according to the reference clock signal, that is, the Doppler frequency offset value.
  • the receiver 1003 Before demodulating the radio frequency signal transmitted by the received base station, the receiver 1003 acquires the reference clock signal provided by the PMU 1001, and determines the moving speed of the mobile terminal by the receiver 1003, and determines, by the processing unit 1004, the mobile terminal to receive according to the moving speed.
  • the problem that the accuracy of signal demodulation is lowered due to the presence of Doppler shift and the communication rate is too slow is avoided.
  • the processing unit 1004 can be:
  • CPU Central Processing Unit
  • two devices that can be used as the processing unit 1004 are provided, and will not be described one by one.
  • the receiver 1003 Before demodulating the radio frequency signal sent by the received base station, the receiver 1003 acquires the reference clock signal provided by the PMU 1001, and determines the moving speed of the mobile terminal by using the GPS, and then the processing unit 1004 determines the Dopping according to the moving speed determined by the GPS.
  • the frequency offset value the receiver 1003 can demodulate the radio frequency signal sent by the base station according to the Doppler frequency offset value and the reference clock signal provided by the PMU 1001, and the accuracy of the moving speed determined by the GPS is high, so that the motion speed is determined according to the moving speed.
  • the accuracy of the Doppler frequency offset value is high, and the modulation accuracy of the RF signal transmitted by the base station is also high according to the reference clock signal and the Doppler frequency offset value, thereby avoiding the communication rate when the Doppler frequency shift is present. Slow question.
  • the processing unit 1004 determines the Doppler frequency offset value according to the moving speed.
  • the method for implementing the processing unit 1004 to determine the Doppler frequency offset value according to the moving speed is:
  • the modulus value of the difference between the speed vector of the mobile terminal acquired by the GPS at the two time points and the speed vector direction of the mobile terminal acquired by the GPS at the two time points may be determined.
  • the mapping relationship of the range of the angles of the angles, the accuracy of the mapping relationship can be set by the person skilled in the art as needed.
  • Presetting the mapping relationship between the difference between the speed vector of the mobile terminal acquired by the GPS and the speed vector of the mobile terminal acquired by the GPS and setting the angle of the angle between the speed vector directions of the two time points When it is necessary to determine the Doppler frequency offset value, it is only necessary to determine the modulus value of the difference between the speed vector of the mobile terminal acquired by the GPS at two time points and the speed of the mobile terminal acquired by the GPS at two time points.
  • the angle of the vector direction corresponds to the Doppler frequency offset value in the mapping relationship, and the processing amount of the mobile terminal is low.
  • the receiver 1003 may superimpose the Doppler frequency offset value and the reference clock signal to determine a demodulation clock signal, and then demodulate the received radio frequency signal according to the demodulation clock signal, thereby avoiding Due to the Doppler frequency offset, the radio frequency modulation accuracy of the communication system is low, and the communication rate is too slow.
  • the receiver 1003 can use other feasible methods to implement the demodulation of the RF signal sent by the received base station according to the Doppler frequency offset value and the reference clock signal, which will not be described herein.
  • Embodiments of the present disclosure provide a signal demodulation method and apparatus to reduce the influence of Doppler shift on a communication rate. After demodulating the radio frequency signal sent by the received base station, after acquiring the reference clock signal provided by the PMU, it is also required to determine the moving speed, and determine the Doppler generated when the mobile terminal receives the radio frequency signal transmitted by the base station according to the moving speed.
  • the frequency offset value is used to demodulate the received RF signal transmitted by the base station according to the reference clock signal and the Doppler frequency offset value. Since the influence of the Doppler shift is considered in demodulating the RF signal transmitted by the base station, the demodulation accuracy is high, thereby avoiding the problem that the communication rate is too slow when there is a Doppler shift.
  • embodiments of the present disclosure can be provided as a method, system, or computer program product. Accordingly, the present disclosure may take the form of an entirely hardware embodiment, an entirely software embodiment, or a combination of software and hardware. Moreover, the present disclosure may 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.
  • the present disclosure is directed to flowcharts and methods of a method, apparatus (system), and computer program product according to embodiments of the present disclosure.
  • the computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device.
  • the apparatus implements the functions specified in one or more flows of the flowchart or a block or blocks of the I or block diagram.
  • 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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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Radar, Positioning & Navigation (AREA)
  • Remote Sensing (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Position Fixing By Use Of Radio Waves (AREA)
  • Mobile Radio Communication Systems (AREA)
  • Power Engineering (AREA)
  • Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
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Abstract

本公开实施例提供一种信号解调方法及装置，以减小多普勒频移对通信速率的影响。在对接收到的基站发送的射频信号进行解调时，获取PMU提供的参考时钟信号后，还需要确定移动终端的移动速度，并根据移动速度确定移动终端接收基站所发射的射频信号时产生的多普勒频偏值，再根据参考时钟信号和多普勒频偏值对接收到的基站发送的射频信号进行解调。因为在对基站发送的射频信号进行解调时，考虑了多普勒频偏的影响，因此解调精度较高，从而避免了当存在多普勒频移时，通信速率过慢的问题。

Description

一种信号解调方法及装置 本申请基于申请号为 201310195569.3、 申请日为 2013/5/23的中国专利申请提出， 并 要求该中国专利申请的优先权， 该中国专利申请的全部内容在此引入本申请作为参考。 技术领域
本公开涉及移动终端开发技术， 尤其涉及一种信号解调方法及装置。 背景技术
通信速率一直很受用户的重视，然而当用户处于移动状态时，由于多普勒效应的存在， 就会产生多普勒频移。 当用户的移动速度较快时， 移动终端在接收基站发送的信号时会存 在较大的多普勒频移， 即接收到的信号的频率与基站实际发送的信号的频率之间的差值， 即多普勒频偏值较大，从而影响通信系统射频解调的精度，影响和基站通信的数据吞吐率。 导致通信速率较慢。
以宽带码分多址移动通信系统 （Wideband Code Division Multiple Access, WCDMA) 为例， 移动终端的全球定位系统 （Global Positioning System, GPS)和 WCDMA的解调装 置电路图如图 1所示， GPS和 WCDMA的信号处理模块均是由收发器（transiver)提供射 频解调的功能， 并将基带信号送到基带 （baseband) 处理器进行处理， 然后由 baseband处 理器将数据告知应用程序（application process, AP) /中央处理器（Central Processing Unit, CPU) 。 图 1中的 transiver在解调时需要一个参考时钟信号进行解调， 参考时钟信号由电 源管理单元（Pressure Measuring Unit, PMU)供给， transiver根据参考时钟信号对 WCDMA 或者其他射频信号做解调。 因此参考时钟信号的值决定了 transiver的解调精度。解调精度 较高， 移动终端与及基站通信的吞吐率也较高， 对应通信系统的通信速率也较大。 然而依 据 PMU 提供的参考时钟信号对射频信号进行解调没有考虑多普勒偏移对射频解调的影 响。 当移动速度较快时， 射频解调的精度较低， 会导致通信速度过慢。 发明内容
本公开实施例提供一种信号解调方法及装置， 以解决当存在多普勒频移时， 通信速率 过慢的问题。
根据本公开实施例的第一方面， 提供一种信号解调方法， 包括：
获取移动终端内 PMU提供的参考时钟信号；
确定所述移动终端的移动速度，并根据移动速度确定所述移动终端接收基站所发射的 射频信号时产生的多普勒频偏值；
根据参考时钟信号及多普勒频偏值， 对接收到的基站发送的射频信号进行解调。 根据本公开实施例的第二方面， 提供一种信号解调装置， 包括：
获取单元， 用于获取移动终端内 PMU提供的参考时钟信号；
确定单元， 用于确定移动终端的移动速度， 并根据移动速度确定所述移动终端接收基 站所发射的射频信号时产生的多普勒频偏值；
解调单元， 用于根据参考时钟信号及多普勒频偏值， 对接收到的基站发送的射频信号 进行解调。
根据本公开实施例的第三方面， 提供一种信号解调装置， 包括：
PMU， 用于提供参考时钟信号；
与 PMU相连的 CA模块， 用于确定移动终端的移动速度， 并根据移动速度确定所述 移动终端接收基站所发射的射频信号时产生的多普勒频偏值， 以及根据多普勒频偏值及 PMU提供的参考时钟信号确定解调时钟信号；
与 CA模块相连的接收器， 用于获取基站发送的射频信号及 CA模块确定的解调时钟 信号， 并根据解调时钟信号对基站发送的射频信号进行解调。
根据本公开实施例的第四方面， 提供一种信号解调装置， 包括：
PMU， 用于提供参考时钟信号；
处理单元，用于根据接收器确定的移动速度确定移动终端接收基站所发射的射频信号 时产生的多普勒频偏值；
与 PMU及处理单元相连的接收器， 用于确定移动终端的移动速度， 并获取基站发送 的射频信号、 PMU 提供参考时钟信号及处理单元确定的多普勒频偏值， 并根据参考时钟 信号即多普勒频偏值对基站发送的射频信号进行解调。
本公开的实施例提供的技术方案可以包括以下有益效果：
本公开实施例提供一种信号解调方法及装置， 以减小多普勒频移对通信速率的影响。 在对接收到的基站发送的射频信号进行解调时， 获取 PMU提供的参考时钟信号后， 还需 要确定移动终端的移动速度，并根据移动速度确定移动终端接收基站所发射的射频信号时 产生的多普勒频偏值，再根据参考时钟信号和多普勒频偏值对接收到的基站发送的射频信 号进行解调。 因为在对基站发送的射频信号进行解调时， 考虑了多普勒频偏的影响， 因此 解调精度较高， 从而避免了当存在多普勒频移时， 调制精度降低， 通信速率过慢的问题。
应当理解的是， 以上的一般描述和后文的细节描述仅是示例性和解释性的， 并不能限 制本发明。 附图说明
此处的附图被并入说明书中并构成本说明书的一部分， 示出了符合本发明的实施例， 并与说明书一起用于解释本发明的原理。
图 1是根据一示例性实施例示出的一种 GPS和 WCDMA解调装置结构示意图之一； 图 2是根据一示例性实施例示出的一种信号解调方法流程图；
图 3是根据一示例性实施例示出的一种确定多普勒频移的方法流程图之一； 图 4是根据一示例性实施例示出的一种确定多普勒频移的方法流程图之二； 图 5 是根据一示例性实施例示出的一种根据参考时钟信号及多普勒频偏值解调的方 法流程图；
图 6是根据一示例性实施例示出的一种较佳的解调方法流程图；
图 7是根据一示例性实施例示出的一种信号解调装置结构示意图之一；
图 8a是根据一示例性实施例示出的一种确定单元的结构示意图之一；
图 8b是根据一示例性实施例示出的一种确定单元的结构示意图之二；
图 9是根据一示例性实施例示出的一种解调单元结构示意图；
图 10是根据一示例性实施例示出的一种信号解调装置结构示意图之二；
图 11是根据一示例性实施例示出的一种信号解调装置结构示意图之三。 具体实施方式
本公开实施例提供一种信号解调方法及装置， 以减小多普勒频移对通信速率的影响。 在对接收到的基站发送的射频信号进行解调时， 获取 PMU提供的参考时钟信号后， 还需 要确定移动终端的移动速度，并根据移动速度确定移动终端接收基站所发射的射频信号时 产生的多普勒频偏值，再根据参考时钟信号和多普勒频偏值对接收到的基站发送的射频信 号进行解调。 因为在对基站发送的射频信号进行解调时考虑了多普勒频偏的影响， 因此解 调精度较高， 从而避免了当存在多普勒频移时， 调制精度降低， 通信速率过慢的问题。
如图 2所示， 本公开实施例提供一种信号解调方法， 包括：
5201、 获取移动终端内 PMU提供的参考时钟信号；
5202、确定移动终端的移动速度， 并根据移动速度确定移动终端接收基站所发射的射 频信号时产生的多普勒频偏值；
S203、根据参考时钟信号及多普勒频偏值，对接收到的基站发送的射频信号进行解调。 在对接收到的基站发送的射频信号进行解调之前， 获取 PMU提供的参考时钟信号， 并确定移动终端的移动速度，根据移动速度确定移动终端接收基站所发射的射频信号时产 生的多普勒频偏值， 在对基站发送的射频信号进行解调时， 根据 PMU提供的参考时钟信 号和多普勒频偏值对基站发送的射频信号进行解调，避免了由于存在多普勒频移而导致信 号解调精度降低， 通信速率过慢的问题。
其中， S202 中根据移动速度确定移动终端接收基站所发射的射频信号时产生的多普 勒频偏值的实现方法有很多，本公开实施例提供两种根据移动速度确定多普勒频偏值的方 法。
如图 3所示，第一种根据移动速度确定移动终端接收基站所发射的射频信号时产生的 多普勒频偏值的方法包括：
5301、 通过 GPS确定移动终端在设定的两个时间点的速度矢量；
5302、 确定设定的两个时间点的速度矢量的差的模值 |Δν|;
5303、 确定设定的两个时间点的速度矢量的方向的夹角 α;
S304、根据多普勒频偏值计算公式 Fd=|AV|*COSo^确定移动终端接收基站所发射的射 频信号时产生的多普勒频偏值 Fd， 其中 λ为无线电波长。
|Δν|及 α均可通过 GPS确定。其中设定的两个时间点可以由本领域技术人员自行设定， 例如， 可以根据 PMU提供的参考时钟信号的获取时间进行设定， 例如， 可以设定两个时 间点为两个设定的参考时钟信号的获取时间， 其中， 两个设定的参考时钟信号可以为获取 时间与当前时间最接近的两个参考时钟信号。
这种方法确定的多普勒频偏值精度较高，能够保证根据多普勒频偏值及参考时钟信号 对基站发送的射频信号进行解码的精度较高。 从而获得较高的通信速率。
如图 4所示， 第二种根据移动速度确定多普勒频偏值的方法为：
S401、 通过全球定位系统 GPS确定移动终端在设定的两个时间点的速度矢量； S402、 确定设定的两个时间点的速度矢量的差的模值 |Δν|;
5403、 确定设定的两个时间点的速度矢量的方向的夹角 α;
5404、 在预先设定的 |Δν|及 a的取值范围与多普勒频偏值的映射关系中査找得到所确 定的 |Δν|及 α对应的多普勒频偏值。
例如， 可以根据 Fd=|AV|*cosaA， 确定 GPS获取的移动终端在设定两个时间点的速度 矢量的差的模值及 GPS 获取的移动终端在设定两个时间点的速度矢量方向的夹角的取值 范围的映射关系， 该映射关系的精度可以由本领域技术人员根据需要自行设定。
预先设定 GPS获取的移动终端在设定两个时间点的速度矢量的差的模值及 GPS获取 的移动终端在设定两个时间点的速度矢量方向的夹角的取值范围的映射关系，在需要确定 多普勒频偏值时， 只需确定 GPS 获取的移动终端在设定两个时间点的速度矢量的差的模 值及 GPS 获取的移动终端在设定两个时间点的速度矢量方向的夹角在映射关系中对应的 多普勒频偏值， 移动终端的处理量较低。
当然， 本领域的技术人员可以采用其他可行方式实现根据移动速度确定多普勒频偏 值， 此处仅提供两种实现方式作为例子示出， 不再一一叙述。
本公开实施例提供一种根据参考时钟信号及多普勒频偏值，对接收到的基站发送的射 频信号进行解调的具体方法， 如图 5所示， 该方法包括-
5501、 叠加参考时钟信号与多普勒频偏值以确定解调时钟信号；
5502、 根据解调时钟信号对接收到的基站发送的射频信号进行解调。
实际应用中，在确定多普勒频偏值之后，可以将多普勒频偏值与参考时钟信号相叠加， 确定解调时钟信号， 再根据解调时钟信号对接收到的基站发送的射频信号进行解调， 从而 避免了由于存在多普勒频偏， 而导致通信系统射频调制精度较低， 通信速率过慢。 本公开实施例提供一种解调方法， 如图 6所示， 该方法包括：
5601、 获取移动终端内 PMU提供的参考时钟信号；
5602、 通过 GPS确定移动终端在设定的两个时间点的速度矢量；
S603、 确定设定的两个时间点的速度矢量的差的模值 |Δν|；
S604、 确定设定的两个时间点的速度矢量的方向的夹角 α;
5605、根据多普勒频偏值计算公式 Fd=|AV|*COSo^确定移动终端接收基站所发射的射 频信号时产生的多普勒频偏值 Fd， 其中 λ为无线电波长；
5606、 叠加参考时钟信号与多普勒频偏值以确定解调时钟信号；
5607、 根据解调时钟信号对接收到的基站发送的射频信号进行解调。
如图 7所示， 本公开实施例提供一种信号解调装置， 包括：
获取单元 701， 用于获取移动终端内 PMU提供的参考时钟信号；
确定单元 702， 用于确定移动终端的移动速度， 并根据移动速度确定移动终端接收基 站所发射的射频信号时产生的多普勒频偏值；
解调单元 703， 用于根据参考时钟信号及多普勒频偏值， 对接收到的基站发送的射频 信号进行解调。
在对接收到的基站发送的射频信号进行解调之前， 由获取单元 501获取 PMU提供的 参考时钟信号， 并由确定单元 502确定移动终端的移动速度， 根据移动速度确定移动终端 接收基站所发射的射频信号时产生的多普勒频偏值， 在对基站发送的射频信号进行解调 时， 由解调单元 503根据 PMU提供的参考时钟信号和多普勒频偏值对基站发送的射频信 号进行解调， 避免了由于存在多普勒频移而导致信号解调的精度降低， 通信速率过慢的问 题。
其中， 确定单元 702根据移动速度确定多普勒频偏值的实现方式有很多， 本公开实施 例提供两种实现根据移动速度确定多普勒频偏值的方式。
第一种实现根据移动速度确定多普勒频偏值的方法为：
如图 8a所示， 确定单元 702包括：
第一确定模块 801， 用于通过 GPS确定移动终端在设定的两个时间点的速度矢量； 第二确定模块 802， 用于确定设定的两个时间点的速度矢量的差的模值 |Δν|;
第三确定模块 803， 用于确定设定的两个时间点的速度矢量的方向的夹角 α;
第四确定模块 804， 用于根据多普勒频偏值计算公式 Fd=|AV|*COSo^确定移动终端接 收基站所发射的射频信号时产生的多普勒频偏值 Fd， 其中 λ为无线电波长。
|Δν|及 α均可通过 GPS确定。其中设定的两个时间点可以由本领域技术人员自行设定， 例如， 可以根据 PMU提供的参考时钟信号的获取时间进行设定， 例如， 可以设定两个时 间点为两个设定的参考时钟信号的获取时间， 其中， 两个设定的参考时钟信号可以为获取 时间与当前时间最接近的两个参考时钟信号。
这种方法确定的多普勒频偏值精度较高，能够保证根据多普勒频偏值及参考时钟信号 对基站发送的射频信号进行解码的精度较高。 从而获得较高的通信速率。
第二种实现根据移动速度确定多普勒频偏值的方法为：
如图 8b所示， 确定单元 702包括：
第一确定模块 801， 用于通过 GPS确定移动终端在设定的两个时间点的速度矢量； 第二确定模块 802， 用于确定设定的两个时间点的速度矢量的差的模值 |Δν|;
第三确定模块 803， 用于确定设定的两个时间点的速度矢量的方向的夹角 α;
査找模块 805， 用于在预先设定的 |Δν|及 α的取值范围与多普勒频偏值的映射关系中 査找得到所确定的 |Δν|及 α对应的多普勒频偏值。
例如， 可以根据 Fd=|AV|*cosaA， 确定 GPS获取的移动终端在设定两个时间点的速度 矢量的差的模值及 GPS 获取的移动终端在设定两个时间点的速度矢量方向的夹角的取值 范围的映射关系， 该映射关系的精度可以由本领域技术人员根据需要自行设定。
预先设定 GPS获取的移动终端在设定两个时间点的速度矢量的差的模值及 GPS获取 的移动终端在设定两个时间点的速度矢量方向的夹角的取值范围的映射关系，在需要确定 多普勒频偏值时， 只需确定 GPS 获取的移动终端在设定两个时间点的速度矢量的差的模 值及 GPS 获取的移动终端在设定两个时间点的速度矢量方向的夹角在映射关系中对应的 多普勒频偏值， 移动终端的处理量较低。
本公开实施例提供一种解调单元 703的具体实现方式， 如图 9所示， 解调单元 703包 括- 叠加模块 901， 用于叠加参考时钟信号与多普勒频偏值以确定解调时钟信号； 解调模块 902， 用于根据解调时钟信号对接收到的基站发送的射频信号进行解调。 实际应用中，在确定多普勒频偏值之后，可以将多普勒频偏值与参考时钟信号相叠加， 确定解调时钟信号， 再根据解调时钟信号对接收到的基站发送的射频信号进行解调， 从而 避免了由于存在多普勒频偏， 而导致通信系统射频调制精度较低， 通信速率过慢。
如图 10所示， 本公开实施例提供一种信号解调装置， 包括：
PMU1001,用于提供参考时钟信号；
与 PMU1001相连的 CA模块 1002， 用于确定移动终端的移动速度， 并根据移动速度 确定移动终端接收基站所发射的射频信号时产生的多普勒频偏值， 以及根据多普勒频偏值 及 PMU提供的参考时钟信号确定解调时钟信号；
与 CA模块相连的接收器 1003， 用于获取基站发送的射频信号及 CA模块 1002确定 的解调时钟信号， 并根据解调时钟信号对基站发送的射频信号进行解调。
在对接收到的基站发送的射频信号进行解调之前，接收器 1003获取 PMU1001提供的 参考时钟信号， 并由 CA模块 1002确定移动终端的移动速度， 并根据移动速度确定移动 终端接收基站所发射的射频信号时产生的多普勒频偏值， 根据多普勒频偏值及 PMU1001 提供的参考时钟信号确定解调时钟信号。 再由接收器 1003根据解调时钟信号对基站发送 的射频信号进行解调， 避免了由于存在多普勒频移而导致信号解调的精度降低， 通信速率 过慢的问题。
其中， CA模块 1002中根据移动速度确定多普勒频偏值的实现方式有很多，本公开实 施例提供一种
CA模块 1002根据移动速度确定多普勒频偏值的方法， 为：
通过全球定位系统 GPS确定移动终端在设定的两个时间点的速度矢量；
确定设定的两个时间点的速度矢量的差的模值 |Δν|；
确定设定的两个时间点的速度矢量的方向的夹角 α;
根据多普勒频偏值计算公式 Fd=|AV|*COSo^确定移动终端接收基站所发射的射频信号 时产生的多普勒频偏值 Fd， 其中 λ为无线电波长。
\A\\R a均可通过 GPS确定。其中设定的两个时间点可以由本领域技术人员根据经验 自行设定， 例如， 可以根据 PMU提供的参考时钟信号的获取时间进行设定， 例如， 可以 设定两个时间点为两个设定的参考时钟信号的获取时间， 其中， 两个设定的参考时钟信号 可以为获取时间与当前时间最接近的两个参考时钟信号。
这种方法确定的多普勒频偏值精度较高，能够保证根据多普勒频偏值及参考时钟信号 对基站发送的射频信号进行解码的精度较高。 从而获得较高的通信速率。
当然， 本领域的技术人员可以采用其他可行方式实现 CA模块 1002根据移动速度确 定多普勒频偏值， 此处提供一种实现方式， 不再一一叙述。
实际应用中， CA模块 1002在确定多普勒频偏值之后， 可以将多普勒频偏值与参考时 钟信号相叠加， 确定解调时钟信号， 再根据解调时钟信号对接收到的基站发送的射频信号 进行解调， 从而避免了由于存在多普勒频偏， 而导致通信系统射频调制精度较低， 通信速 率过慢。 即 CA模块 1002包括用于叠加参考时钟信号及多普勒频偏值的直接数字式频率 合成器 DDS ;
CA模块 1002根据多普勒频偏值及参考时钟信号确定解调时钟信号， 用于： 通过 DDS叠加参考时钟信号及多普勒频偏值确定解调时钟信号。
进一步， 为了防止 CA模块 1002根据 GPS确定移动速度时， 影响到移动终端中的其 他需要使用 GPS获取的体现移动速度的射频信号的模块， 可以将 GPS获取的体现移动速 度的射频信号耦合到 CA模块 1002中， 则较佳的， 本公开实施例提供的解调装置还包括: 与 CA模块 1002相连的耦合模块， 用于将 GPS获取的体现移动速度的射频信号耦合 到 CA模块 1002中。
如图 11所示， 本公开实施例还提供一种信号解调装置， 包括：
PMU1001用于提供参考时钟信号；
处理单元 1004， 用于根据接收器确定的移动速度确定移动终端接收基站所发射的射 频信号时产生的多普勒频偏值；
与 PMU1001及处理单元 1004相连的接收器 1003， 用于确定移动终端的移动速度， 并获取基站发送的射频信号、 PMU1001提供参考时钟信号及处理单元 1004确定的多普勒 频偏值， 并根据参考时钟信号即多普勒频偏值对基站发送的射频信号进行解调。
在对接收到的基站发送的射频信号进行解调之前，接收器 1003获取 PMU1001提供的 参考时钟信号， 并由接收器 1003确定移动终端的移动速度， 由处理单元 1004并根据移动 速度确定移动终端接收基站所发射的射频信号时产生的多普勒频偏值， 再由接收器 1003 根据参考时钟信号即多普勒频偏值对基站发送的射频信号进行解调对基站发送的射频信 号进行解调， 避免了由于存在多普勒频移而导致信号解调的精度降低， 通信速率过慢的问 题。
其中处理单元 1004可以为：
应用处理器 ( application processer, AP) ； 或者
中央处理器 （Central Processing Unit, CPU) 。
当然， 本领域的技术人员可以采用其他可用装置作为处理单元 1004， 此处只是提供 两种可作为处理单元 1004的装置， 不再一一叙述。
在对接收到的基站发送的射频信号进行解调之前，接收器 1003获取 PMU1001提供的 参考时钟信号， 并通过 GPS确定移动终端的移动速度， 再由处理单元 1004根据 GPS 确 定的移动速度确定多普勒频偏值，接收器 1003可以根据多普勒频偏值及 PMU1001提供的 参考时钟信号对基站发送的射频信号进行解调， 通过 GPS 确定的移动速度的精度很高， 使根据移动速度确定的多普勒频偏值的精度较高，根据参考时钟信号及多普勒频偏值对基 站发送的射频信号的调制精度也较高， 从而避免了当存在多普勒频移时， 通信速率过慢的 问题。
其中， 处理单元 1004根据移动速度确定多普勒频偏值的实现方式有很多， 本公开实 施例提供一种实现处理单元 1004根据移动速度确定多普勒频偏值的方法为：
通过全球定位系统 GPS确定移动终端在设定的两个时间点的速度矢量；
确定设定的两个时间点的速度矢量的差的模值 |Δν|；
确定设定的两个时间点的速度矢量的方向的夹角 α;
在预先设定的 |Δν|及 α 的取值范围与多普勒频偏值的映射关系中査找得到所确定的
|Δν|及 α对应的多普勒频偏值。
例如， 可以根据 Fd=|AV|*cosaA， 确定 GPS获取的移动终端在设定两个时间点的速度 矢量的差的模值及 GPS 获取的移动终端在设定两个时间点的速度矢量方向的夹角的取值 范围的映射关系， 该映射关系的精度可以由本领域技术人员根据需要自行设定。
预先设定 GPS获取的移动终端在设定两个时间点的速度矢量的差的模值及 GPS获取 的移动终端在设定两个时间点的速度矢量方向的夹角的取值范围的映射关系，在需要确定 多普勒频偏值时， 只需确定 GPS 获取的移动终端在设定两个时间点的速度矢量的差的模 值及 GPS 获取的移动终端在设定两个时间点的速度矢量方向的夹角在映射关系中对应的 多普勒频偏值， 移动终端的处理量较低。
当然， 本领域的技术人员可以采用其他可行方式实现处理单元 1004根据移动速度确 定多普勒频偏值， 此处仅提供一种实现方式， 不再一一叙述。
实际应用中， 接收器 1003可以将多普勒频偏值与参考时钟信号相叠加， 确定解调时 钟信号， 再根据解调时钟信号对接收到的基站发送的射频信号进行解调， 从而避免了由于 存在多普勒频偏， 而导致通信系统射频调制精度较低， 通信速率过慢。
当然， 本领域的技术人员可以采用其他可行方式实现接收器 1003 根据多普勒频偏值与 参考时钟信号对接收到的基站发送的射频信号进行解调， 此处不再一一叙述。
本公开实施例提供一种信号解调方法及装置， 以减小多普勒频移对通信速率的影响。 在 对接收到的基站发送的射频信号进行解调时， 获取 PMU提供的参考时钟信号后， 还需要 定移动速度，并根据移动速度确定移动终端接收基站所发射的射频信号时产生的多普勒频 偏值， 再根据参考时钟信号和多普勒频偏值对接收到的基站发送的射频信号进行解调。 因 为在对基站发送的射频信号进行解调时， 考虑了多普勒频偏的影响， 因此解调精度较高， 从而避免了当存在多普勒频移时， 通信速率过慢的问题。
本领域内的技术人员应明白，本公开的实施例可提供为方法、系统、或计算机程序产品。 因此， 本公开可采用完全硬件实施例、 完全软件实施例、 或结合软件和硬件方面的实施例 的形式。而且， 本公开可采用在一个或多个其中包含有计算机可用程序代码的计算机可用 存储介质 （包括但不限于磁盘存储器、 CD-ROM、 光学存储器等）上实施的计算机程序产 品的形式。
本公开是参照根据本公开实施例的方法、 设备 （系统） 、 和计算机程序产品的流程图和
I或方框图来描述的。应理解可由计算机程序指令实现流程图和 I或方框图中的每一流程 和 I或方框、 以及流程图和 I或方框图中的流程和 I或方框的结合。 可提供这些计算机程 序指令到通用计算机、 专用计算机、 嵌入式处理机或其他可编程数据处理设备的处理器以 产生一个机器，使得通过计算机或其他可编程数据处理设备的处理器执行的指令产生用于 实现在流程图一个流程或多个流程和 /或方框图一个方框或多个方框中指定的功能的装 置。
这些计算机程序指令也可存储在能引导计算机或其他可编程数据处理设备以特定方式 工作的计算机可读存储器中，使得存储在该计算机可读存储器中的指令产生包括指令装置 的制造品，该指令装置实现在流程图一个流程或多个流程和 I或方框图一个方框或多个方 框中指定的功能。
这些计算机程序指令也可装载到计算机或其他可编程数据处理设备上， 使得在计算机或 其他可编程设备上执行一系列操作步骤以产生计算机实现的处理，从而在计算机或其他可 编程设备上执行的指令提供用于实现在流程图一个流程或多个流程和 /或方框图一个方 框或多个方框中指定的功能的步骤。
尽管已描述了本公开的优选实施例， 但本领域内的技术人员一旦得知了基本创造性概 念， 则可对这些实施例作出另外的变更和修改。 所以， 所附权利要求意欲解释为包括优选 实施例以及落入本公开范围的所有变更和修改。 显然， 本领域的技术人员可以对本公开进行各种改动和变型而不脱离本公开的精神和范 围。 这样， 倘若本公开的这些修改和变型属于本公开权利要求及其等同技术的范围之内， 则本公开也意图包含这些改动和变型在内。

Claims

权利要求
1、 一种信号解调方法， 其特征在于， 所述方法包括：
获取移动终端内电源管理单元 PMU提供的参考时钟信号；
确定所述移动终端的移动速度，并根据所述移动速度确定所述移动终端接收基站所 发射的射频信号时产生的多普勒频偏值；
根据所述参考时钟信号及所述多普勒频偏值，对接收到的所述基站发送的射频信号 进行解调。
2、 如权利要求 1所述的方法， 其特征在于， 所述确定所述移动终端的移动速度， 并根据所述移动速度确定所述移动终端接收基站所发射的射频信号时产生的多普勒频 偏值， 包括：
通过全球定位系统 GPS确定所述移动终端在设定的两个时间点的速度矢量； 确定所述设定的两个时间点的速度矢量的差的模值 |Δν|;
确定所述设定的两个时间点的速度矢量的方向的夹角 α;
根据多普勒频偏值计算公式 Fd=|AV|*COSo^确定所述移动终端接收基站所发射的 射频信号时产生的多普勒频偏值 Fd， 其中 λ为无线电波长。
3、 如权利要求 1所述的方法， 其特征在于， 所述确定移动终端的移动速度， 并根 据所述移动速度确定所述移动终端接收基站所发射的射频信号时产生的多普勒频偏值， 包括：
通过全球定位系统 GPS确定所述移动终端在设定的两个时间点的速度矢量； 确定所述设定的两个时间点的速度矢量的差的模值 |Δν|;
确定所述设定的两个时间点的速度矢量的方向的夹角 α;
在预先设定的 |Δν|及 α的取值范围与多普勒频偏值的映射关系中査找得到所确定的 |Δν|及 α对应的多普勒频偏值。
4、 如权利要求 1所述的方法， 其特征在于， 所述根据所述参考时钟信号及所述多 普勒频偏值， 对接收到的所述基站发送的射频信号进行解调， 包括：
叠加所述参考时钟信号与所述多普勒频偏值以确定解调时钟信号；
根据所述解调时钟信号对接收到的所述基站发送的射频信号进行解调。
5、 一种信号解调装置， 其特征在于， 所述装置包括：
获取单元， 用于获取移动终端内电源管理单元 PMU提供的参考时钟信号； 确定单元， 用于确定所述移动终端的移动速度， 并根据所述移动速度确定所述移动 终端接收基站所发射的射频信号时产生的多普勒频偏值；
解调单元， 用于根据所述参考时钟信号及所述多普勒频偏值， 对接收到的所述基站 发送的射频信号进行解调。
6、 如权利要求 5所述的装置， 其特征在于， 所述确定单元， 包括：
第一确定模块， 用于通过全球定位系统 GPS确定所述移动终端在设定的两个时间 点的速度矢量；
第二确定模块， 用于确定所述设定的两个时间点的速度矢量的差的模值 |Δν|; 第三确定模块， 用于确定所述设定的两个时间点的速度矢量的方向的夹角 α; 第四确定模块，用于根据多普勒频偏值计算公式 Fd=|AV|*COSo^确定所述移动终端 接收基站所发射的射频信号时产生的多普勒频偏值 Fd， 其中 λ为无线电波长。
7、 如权利要求 5所述的装置， 其特征在于， 所述确定单元， 包括：
第一确定模块， 用于通过全球定位系统 GPS确定所述移动终端在设定的两个时间 点的速度矢量；
第二确定模块， 用于确定所述设定的两个时间点的速度矢量的差的模值 |Δν|; 第三确定模块， 用于确定所述设定的两个时间点的速度矢量的方向的夹角 α; 査找模块， 用于在预先设定的 |Δν|及 α的取值范围与多普勒频偏值的映射关系中査 找得到所确定的 |Δν|及 α对应的多普勒频偏值。
8、 如权利要求 5所述的装置， 其特征在于， 所述解调单元包括：
叠加模块， 用于叠加所述参考时钟信号与所述多普勒频偏值以确定解调时钟信号； 解调模块，用于根据所述解调时钟信号对接收到的所述基站发送的射频信号进行解 调。
9、 一种信号解调装置， 其特征在于， 所述装置包括：
电源管理单元 PMU， 用于提供参考时钟信号；
与所述 PMU相连的 CA模块， 用于确定移动终端的移动速度， 并根据所述移动速 度确定所述移动终端接收基站所发射的射频信号时产生的多普勒频偏值，以及根据所述 多普勒频偏值及 PMU提供的参考时钟信号确定解调时钟信号；
与所述 CA模块相连的接收器， 用于获取基站发送的射频信号及所述 CA模块确定 的解调时钟信号， 并根据所述解调时钟信号对所述基站发送的射频信号进行解调。
10、 如权利要求 9所述的装置， 其特征在于， 所述 CA模块包括用于叠加所述参 考时钟信号及所述多普勒频偏值的直接数字式频率合成器 DDS;
所述 CA模块根据所述多普勒频偏值及参考时钟信号确定解调时钟信号， 用于： 通过 DDS叠加所述参考时钟信号及所述多普勒频偏值确定解调时钟信号。
11、 如权利要求 9所述的装置， 其特征在于， 还包括：
与所述 CA模块相连的耦合模块， 用于将所述 GPS获取的体现移动速度的射频信 号耦合到所述 CA模块中。
12、 一种信号解调装置， 其特征在于， 所述装置包括：
电源管理单元 PMU， 用于提供参考时钟信号；
处理单元，用于根据接收器确定的移动速度确定移动终端接收基站所发射的射频信 号时产生的多普勒频偏值；
与所述 PMU及所述处理单元相连的接收器， 用于确定移动终端的移动速度， 并获 取所述基站发送的射频信号、 PMU提供参考时钟信号及所述处理单元确定的多普勒频 偏值，并根据所述参考时钟信号及所述多普勒频偏值对所述基站发送的射频信号进行解 调。
13、 如权利要求 12所述的装置， 其特征在于， 所述处理单元为：
应用处理器 AP; 或者
中央处理器 CPU。
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