WO2015135427A1 - 功率控制方法及装置 - Google Patents

功率控制方法及装置 Download PDF

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Publication number
WO2015135427A1
WO2015135427A1 PCT/CN2015/073478 CN2015073478W WO2015135427A1 WO 2015135427 A1 WO2015135427 A1 WO 2015135427A1 CN 2015073478 W CN2015073478 W CN 2015073478W WO 2015135427 A1 WO2015135427 A1 WO 2015135427A1
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Prior art keywords
signal
power
papr
parameter
terminals
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PCT/CN2015/073478
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English (en)
French (fr)
Inventor
邹志强
柴洪林
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华为技术有限公司
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Application filed by 华为技术有限公司 filed Critical 华为技术有限公司
Priority to EP15761004.9A priority Critical patent/EP3107336B1/en
Publication of WO2015135427A1 publication Critical patent/WO2015135427A1/zh
Priority to US15/264,163 priority patent/US9961652B2/en

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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/52—TPC using AGC [Automatic Gain Control] circuits or amplifiers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L43/00—Arrangements for monitoring or testing data switching networks
    • H04L43/02—Capturing of monitoring data
    • H04L43/028—Capturing of monitoring data by filtering
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L7/00—Arrangements for synchronising receiver with transmitter
    • H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
    • H04L7/007—Detection of the synchronisation error by features other than the received signal transition detection of error based on maximum signal power, e.g. peak value, maximizing autocorrelation
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W24/00—Supervisory, monitoring or testing arrangements
    • H04W24/02—Arrangements for optimising operational condition
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/02—Power saving arrangements
    • H04W52/0209—Power saving arrangements in terminal devices
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
    • H04W52/04—TPC
    • H04W52/30—TPC using constraints in the total amount of available transmission power
    • H04W52/34—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading
    • H04W52/346—TPC management, i.e. sharing limited amount of power among users or channels or data types, e.g. cell loading distributing total power among users or channels
    • 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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
    • H04W88/12—Access point controller devices
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00—Reducing energy consumption in communication networks
    • Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks

Definitions

  • the present invention relates to the field of communications technologies, and in particular, to a power control method and apparatus.
  • Orthogonal Frequency Division Multiplexing (OFDM) technology is widely used in the current technology.
  • LTE Long Term Evolution
  • OFDM technology divides the channel into channels. With several orthogonal subchannels, the data is modulated to be transmitted on each subchannel.
  • the orthogonal signals can be separated by using correlation techniques at the receiving end, which can reduce mutual interference between subchannels and make reception simpler.
  • the OFDM signal is added by multiple independent modulated subcarrier signals, such a composite signal may be relatively large.
  • the peak power that is, the Peak to Averge Power Ratio (PAPR)
  • PAPR Peak to Averge Power Ratio
  • EVM Error Vector Magnitude
  • the existing power control method performs the same processing on the signals of the entire frequency band, since the entire frequency band may contain modulated signals of different orders (ie, signals of different users), and different orders
  • the modulation signal has different requirements on modulation accuracy.
  • the existing power control processing method cannot handle different orders of signals differently to meet different requirements, and the high-order (ie, near-end users) often has poor precision. It is impossible to balance the different users in the distance, and the overall performance of the OFDM system is limited.
  • the present invention provides a power control method and apparatus for performing different processing on signals of different terminals, taking into account the balance between total power, EVM, and power amplifier efficiency of the OFDM system, and improving system performance of the OFDM system.
  • a first aspect of the present invention provides a power control method, where the power control method includes:
  • the base station determines an error vector magnitude EVM index adjustment parameter of the n terminals according to the terminal type of the currently scheduled n terminals, where n is a positive integer, and the EVM indicator adjustment parameter includes at least one of the following: a power control parameter, The peak-to-peak ratio PAPR parameter, the terminal type includes: a near-end user, a mid-end user, or a remote user;
  • the base station adjusts parameters according to the EVM indicators of the n terminals, processes the signals to be transmitted of the n terminals to obtain an output signal, and determines a total power change of the output signal with respect to the to-be-transmitted signal;
  • the base station dynamically controls the power supply voltage of the power amplifier according to the total power variation of the output signal with respect to the signal to be transmitted.
  • the base station dynamically controls a power supply voltage of the power amplifier according to a total power change of the output signal with respect to the to-be-transmitted signal, including: The total power of the output signal relative to the signal to be transmitted becomes larger, increasing the power supply voltage of the power amplifier, or if the total power of the output signal relative to the signal to be transmitted becomes smaller, reducing the power amplifier voltage.
  • the base station determines, according to the type of the n terminals that are currently scheduled, the n terminals Error vector magnitude EVM indicator adjustment parameters, including:
  • the base station adjusts the power control parameter to reduce the power of the terminal whose terminal type is a near-end user;
  • the base station adjusts the power control parameter to increase the power of the terminal type of the terminal end user or the remote user terminal.
  • the base station adjusts a parameter according to the EVM indicator, and processes a signal to be processed to obtain an output signal. ,Specifically:
  • the base station adjusts a first parameter value in the to-be-transmitted signal according to the power control parameter to obtain the output signal, where the first parameter value is used to indicate a power adjustment value of a carrier, thereby controlling the The transmit power of n terminals.
  • the base station adjusts a parameter according to the EVM indicator, and processes the signal to be processed to obtain an output signal. ,Specifically:
  • the base station uses the signal to be transmitted as an input signal for PAPR reduction processing
  • the base station performs a PAPR process of dividing the frequency of the PAPR-processed input signal according to the power control parameter to obtain the output signal.
  • the base station performs the PAPR process of the frequency-divided point on the input signal of the PPR-reduced process to obtain the output signal according to the PPR-reduced parameter, and specifically includes:
  • the reduced PAPR processing signal is used as the output signal; or the SPR processing signal is used as an input signal for the next round-down PAPR processing, and S1-S4 is repeatedly performed until the falling PAPR processing signal.
  • the amplitude is less than the preset threshold T or the number of executions reaches a preset number of executions, and the falling PAPR processed signal is used as the output signal.
  • the present invention further provides a power control device, where the power control device includes: an upper layer control module, a processing module, and a power amplifier control module;
  • the upper layer control module is configured to determine an error vector magnitude EVM index adjustment parameter of the n terminals according to a currently scheduled terminal type of the n terminals, where n is a positive integer, and the EVM indicator adjustment parameter is at least
  • the method includes the following: a power control parameter, a peak-to-peak ratio PAPR parameter, and the terminal type includes: a near-end user, a mid-end user, or a remote user;
  • the processing module is configured to process, according to the EVM index adjustment parameters of the n terminals configured by the upper layer control module, the signals to be transmitted of the n terminals to obtain an output signal;
  • the power amplifier control module is configured to determine a total power change of the output signal processed by the processing module relative to the signal to be transmitted, and according to a total power change of the output signal relative to the signal to be transmitted Dynamically control the power supply voltage of the power amplifier.
  • the power amplifier control module is specifically configured to: if the total power of the output signal relative to the signal to be transmitted becomes larger, increase the power amplifier The power supply voltage, or if the total power of the output signal relative to the signal to be transmitted becomes smaller, reduces the power supply voltage of the power amplifier.
  • the upper layer control module is specifically configured to adjust the power control parameter to reduce the power of the terminal type of the terminal user;
  • the power control parameters are adjusted to increase the power of the terminal type of the terminal user or the terminal of the remote user.
  • the processing module includes:
  • a user power configuration module configured to adjust, according to the power control parameter, a first parameter value in the to-be-transmitted signal to obtain the output signal, where the first parameter value is used to indicate a power adjustment value of a carrier, Thereby controlling the transmission power of the n terminals.
  • the processing module includes:
  • the PAPR module is configured to perform a PAPR process on the PPR-reduced input signal according to the PPR-reduced PAPR parameter to obtain the output signal, where the input signal of the PPR-reduced process is the to-be-transmitted signal.
  • the down PAPR module is specifically configured to perform the following steps:
  • the reduced PAPR processing signal is used as the output signal; or the SPR processing signal is used as an input signal for the next round-down PAPR processing, and S1-S4 is repeatedly performed until the falling PAPR processing signal.
  • the amplitude is less than the preset threshold T or the number of executions reaches a preset number of executions, and the falling PAPR processed signal is used as the output signal.
  • the power control device is a radio base station NodeB or an evolved base station eNodeB or a radio network controller RNC.
  • the power control method and device provided by the present invention configure different user powers for different terminals, perform different processing, and simultaneously balance the total power of the OFDM system, EVM, power amplifier efficiency, etc., and improve system performance of the OFDM system. .
  • FIG. 1 is a flowchart of a power control method according to an embodiment of the present invention
  • FIG. 2 is a flowchart of a process for reducing a PAPR according to an embodiment of the present invention
  • FIG. 3 is a schematic structural diagram of a power control apparatus according to an embodiment of the present invention.
  • FIG. 4 is a schematic diagram of a PAPR-lowering module according to an embodiment of the present invention.
  • FIG. 5 is a schematic structural diagram of a power control apparatus according to an embodiment of the present invention.
  • the power control method and device provided by the embodiments of the present invention are applicable to a communication system using OFDM technology, such as a communication system such as LTE, and is particularly suitable for a communication system having high requirements on efficiency and accuracy of power control.
  • the power control method provided by the embodiment of the present invention may be implemented in a device such as a radio base station NodeB or an evolved base station eNodeB or a radio network controller RNC, and the power control device may be a NodeB or an eNodeB or an RNC.
  • the power control method of the present invention includes:
  • the base station determines, according to the currently scheduled terminal types of the n terminals, the EVM index adjustment parameters of the n terminals, where n is a positive integer.
  • the types of the terminals include: a near-end user, a mid-end user, or a remote user.
  • the base station may determine the type of the terminal according to a Signal to Interference and Noise Ratio (SINR) of the terminal.
  • SINR Signal to Interference and Noise Ratio
  • a general base station can obtain a SINR by using a channel quality indicator (CQI) reported by a terminal, and distinguish the terminal into a remote user or a near-end user, for example, marking a user with a SINR ⁇ 5 dB (Decibel) as a remote user.
  • CQI channel quality indicator
  • a user with a SINR>20 dB is marked as a near-end user
  • a user with 5 dB ⁇ SINR ⁇ 20 dB is marked as a mid-end user.
  • the EVM indicator adjustment parameter includes at least one of the following: a power control parameter and a falling PAPR parameter.
  • the base station adjusts parameters according to the EVM indicators of the n terminals, and processes the signals to be transmitted of the n terminals to obtain an output signal.
  • the EVM indicator adjustment parameter includes a power control parameter.
  • the base station adjusts the power control parameter to reduce the power of the terminal type of the terminal user.
  • the base station adjusts the power control parameter to increase the power of the terminal type of the terminal end user or the remote user terminal.
  • PA is a dB value of ⁇ a
  • ⁇ a represents a ratio of the power of each resource element (Resource Element, RE) of the column of the pilot-free symbol to the power of the pilot signal
  • PB indicates the pilot power boost information, the value A linear value, which also indicates the value of ⁇ b/ ⁇ a, where ⁇ b represents the ratio of the power of the pilot symbol-containing RE to the pilot signal power, respectively.
  • the power control parameter of the user is adjusted to reduce the power of the user, for example, the PA and PB values are adjusted from (-3, 1) to (-4.77, 2). . If the type of the currently scheduled terminal is a remote user, the power control parameter of the user is adjusted to increase the power of the user, for example, the PA and PB values are adjusted from (-3, 1) to (0, 0).
  • the PA value of the user is reduced from the original 0 to -3.
  • the total transmit power of the entire cell can be reduced, and the current user's EVM becomes smaller (that is, the difference between the current user's signal and the ideal signal becomes smaller) while maintaining the entire PAPR parameter unchanged, which is equivalent to promotion.
  • Signal-to-noise ratio which improves the throughput of current users.
  • the PA value of the user is increased, for example, the PA value is changed from the original -3 to 0, and the remote user is maintained while maintaining the entire PAPR parameter unchanged.
  • the EVM is degraded, but the user's power is raised, and because QPSK's tolerance to EVM is relatively high, the overall performance of the user is improved.
  • the parameter is adjusted according to the EVM index, and the signal to be transmitted is processed to obtain an output signal.
  • the base station processes the signal to be transmitted according to the power control parameter to obtain an output signal.
  • the base station controls the power of the terminal through the power control parameter.
  • the base station processes the signal to be transmitted according to the power control parameter, and specifically includes: determining, by the base station, the first parameter value in the to-be-transmitted signal according to the power control parameter
  • the output signal is used to indicate a power adjustment value of one carrier, thereby controlling transmission power of the n terminals. For different terminals, the transmission power of the terminal is controlled by adjusting the first parameter value in the signal to be transmitted.
  • the parameter is adjusted according to the EVM index, and the signal to be transmitted is processed to obtain an output signal.
  • the base station processes the signal to be transmitted according to the PAPR parameter to obtain an output signal.
  • the base station processes the signal to be transmitted according to the PAPR parameter to obtain an output signal, where the base station uses the signal to be transmitted as an input signal for the PAPR reduction process; and the base station processes the PAPR according to the PAPR parameter.
  • the input signal is subjected to a falling PAPR process of a frequency division point to obtain the output signal.
  • the specific includes:
  • S201 Perform peak clipping processing on the input signal of the down PAPR processing according to a preset threshold T to obtain a peak clipping signal.
  • a position in the input signal S whose amplitude exceeds the preset threshold T is first found, and then a peak clipping signal S' is generated at the found position.
  • the peak clipping signal S' is filtered by the filter f0.
  • the signal to be transmitted S is added to the signals obtained in steps S2022 and S2024.
  • the signal obtained by the S204 is used as the output signal, or the SPR-processed signal is used as the input signal of the next round-down PAPR processing, and S201-S204 are repeatedly executed until the amplitude of the signal is less than the preset threshold T. Or the number of iterations reaches a maximum number of iterations, and the down PAPR processed signal is used as the output signal.
  • the process of descending PAPR may introduce EVM degradation.
  • the smaller the EVM the better the performance.
  • the EVM is usually introduced when performing the PAPR reduction process, resulting in a decrease in overall system performance.
  • Different modulation modes can tolerate different EVMs, and the higher the modulation mode, the smaller the tolerance.
  • the indicators of the QPSK, 16QAM, and 64QAM modulation modes given by the standard 3GPP TS36104-b40 are 17.5%, 12.5%, and 8%, respectively.
  • different modulation modes are adopted for different terminals, and different PAPR processing can be performed, so that the PAPR processing by the frequency division point can effectively balance the EVM and power amplifier efficiency in the OFDM system. Balance and improve system performance of OFDM systems.
  • the current bandwidth is allocated to two users, one of which is a remote user (using QPSK modulation) and the other is a near-end user (using 64QAM modulation), respectively occupying The front and rear half bandwidth (10M each).
  • the threshold T of the falling PAPR is also unchanged, and the following processing is performed on the superimposed noise processing: assuming C0 is 1, the noise of the far-end user's frequency band is increased (for example, C1 is set) 0.5), the noise of the near-end user's frequency band is reduced (for example, C2 is set to -0.5), so that the EVM ratio of the near-end user The EVM without the above processing is small, and the far-end user is opposite. The performance of the near-end is improved. Because the tolerance of the QPSK to the EVM is relatively high, the performance of the remote user may not necessarily decrease.
  • the to-be-transmitted signal may be processed only in the method of the first scenario, thereby performing user-level power configuration to control the total transmit power of the entire cell, and improving system performance of the OFDM system.
  • the signal to be transmitted may be processed by using only the method of the second case, that is, when the power control parameters of the current terminal are unchanged, different EVM indicator parameters may be adjusted according to the type of the terminal, thereby
  • the PAPR process is performed to perform different processing on terminals at different far and near points, to improve the efficiency of the power amplifier, and to meet different requirements.
  • the signals to be transmitted may also be processed in a combination of two methods, for example,
  • the PAPR parameter (Ci) can be adjusted so that the terminal can add more noise, and conversely, the noise can be reduced.
  • the power control method provided by the present invention can perform different processing on signals of different terminals, taking into account the balance between total power, EVM, and power amplifier efficiency of the OFDM system, and improving system performance of the OFDM system.
  • the current bandwidth is allocated to two terminals, one of which uses QPSK modulation for the far-end user and the other uses 64QAM modulation for the near-end user, occupying the front and the back respectively.
  • Half bandwidth (10M each).
  • the upper layer increases the power control parameters for the remote user, such as increasing the PA value of the user, for example, from the original -1 to 1, and assuming that the threshold T of the falling PAPR is unchanged, the following PAPR processing is performed as follows: Processing: Assume that C0 is 1, the noise on the frequency band of the remote user is increased.
  • setting C1 to 0.5 reduces the noise on the frequency band of the near-end user, for example, setting C2 to -0.5, so that the near-end user
  • the EVM is smaller than the EVM without the above processing.
  • the performance of the near end is improved. Because the QPSK has a relatively high tolerance to the EVM, the performance of the remote user may not necessarily decrease.
  • the base station determines a total power variation of the output signal relative to the signal to be transmitted.
  • the processing result of the base station according to the methods S101 to S102 (may include: only after the first case The processing or the processing of only the second case or the combination of the two cases) determines the total power change of the last output signal relative to the signal to be transmitted.
  • the base station dynamically controls a power supply voltage of the power amplifier according to a total power variation of the output signal with respect to the signal to be transmitted.
  • the upper layer lowers the power control parameters of all current (or part) terminals, that is, the power output of the power amplifier becomes smaller, and the power supply voltage of the power amplifier is lowered; on the contrary, if the upper layer increases the current The power of all (or part of) the user, the power supply voltage of the amplifier is turned up. This matches the power supply voltage of the amplifier to the actual output power.
  • the power control method provided by the embodiment of the present invention controls the power of different terminals by using power control parameters, and adopts different PAPR processing for different near and far terminals, so that different terminals can have different scheduling strategies, and simultaneously consider the total power of the OFDM system.
  • the balance between EVM, power amplifier efficiency, etc. improves the overall performance of the OFDM system.
  • FIG. 3 is a schematic diagram of a power control apparatus according to the embodiment.
  • the power control apparatus of the present invention includes an upper layer control module 301, a processing module 302, and a power amplifier control module 303.
  • the upper layer control module 301 is configured to determine EVM index adjustment parameters of the n terminals according to the currently scheduled terminal types of the n terminals, where n is a positive integer.
  • the types of the terminals include: a near-end user, a mid-end user, or a remote user.
  • the base station may determine the type of the terminal according to the SINR of the terminal.
  • the SeNB can obtain the SINR through the CQI reported by the terminal, and distinguish the terminal into remote users and near-end users. For example, the user with the SINR ⁇ 5dB (Decibel) is marked as the remote user, and the user with the SINR>20dB is marked as For near-end users, users with 5dB ⁇ SINR ⁇ 20dB are marked as mid-end users.
  • the EVM indicator adjustment parameter configured by the upper layer control module 301 includes at least one of the following: a power control parameter and a down PAPR parameter.
  • the EVM index adjustment parameter configured by the upper layer control module 301 includes a power control parameter.
  • the upper layer control module 301 is specifically configured to adjust the power control parameter to reduce the power of the terminal type of the terminal user.
  • the upper layer control module 301 is specifically configured to adjust the power control parameter to increase the power of the terminal type of the terminal end user or the remote user terminal.
  • the base station controls the power of the terminal through the power control parameter.
  • the processing module 302 is configured to process the signal to be transmitted according to the EVM index adjustment parameter configured by the upper layer control module 301 to obtain an output signal.
  • the processing module 302 includes a user power configuration module 3021 and/or a drop PAPR module 3022.
  • the user power configuration module 3021 is configured to adjust, according to the power control parameter, a first parameter value in the to-be-transmitted signal to obtain the output signal, where the first parameter value is used to indicate a power adjustment value of a carrier, Thereby controlling the transmission power of the n terminals.
  • the falling PAPR module 3022 is configured to perform, according to the falling PAPR parameter, a PAPR process of a frequency division point of the PAPR-processed input signal to obtain the output signal, where the input signal of the PAPR-reduced signal is the to-be-transmitted signal or user The signal output by the power configuration module 3021.
  • the PAPR module 3022 specifically includes a first determining unit 401, a second determining unit 402, a peak clipping unit 403, a plurality of filters 404, a plurality of multipliers 405, and an adder 406, specifically for performing steps. as shown in picture 2.
  • the first determining unit 401 is configured to determine whether the number of iterations is less than the maximum number of iterations M. If yes, the process proceeds to the second determining unit 402, and otherwise ends.
  • the second determining unit 402 is configured to determine whether the amplitude of the signal S to be transmitted exceeds the preset threshold T, and if yes, enter the peak clipping unit 403 to generate a peak clipping signal S', otherwise it ends.
  • the execution step of the PAPR module 3022 can be as shown in FIG. 2.
  • the power amplifier control module 303 is configured to determine a total power variation of the output signal after the signal to be transmitted is processed by the processing module 302, and dynamically control the power voltage of the power amplifier according to the total power variation of the output signal.
  • the power amplifier control module 303 increases the power supply voltage of the power amplifier. If the total power of the output signal becomes smaller, the power amplifier control module 303 reduces the power supply voltage of the power amplifier.
  • the power control method and device provided by the present invention control the power of different terminals through power control parameters, and adopt different PAPR processing for different near and far terminals, so that different terminals can have different scheduling strategies while taking into account the total power of the OFDM system.
  • the balance between EVM, power amplifier efficiency, etc. improves the overall performance of the OFDM system.
  • FIG. 5 is a schematic structural diagram of a power control apparatus according to an embodiment of the present invention. As shown in FIG. 5, the power control apparatus includes: a processor 501, a transceiver 502, and a memory 503.
  • the processor 501 may be a single-core or multi-core central processing unit (CPU), or an application specific integrated circuit (Application Specific Integrated Circuit, ASIC), or one or more integrated circuits configured to implement embodiments of the present invention.
  • CPU central processing unit
  • ASIC Application Specific Integrated Circuit
  • the transceiver 502 is configured to interact with a user equipment.
  • the memory 503 is used to store programs.
  • the processor 501 calls the program stored in the memory 503 for execution:
  • an error vector magnitude EVM index adjustment parameter of the n terminals Determining an error vector magnitude EVM index adjustment parameter of the n terminals according to the currently scheduled terminal types of the n terminals, where n is a positive integer, and the EVM index adjustment parameter includes at least one of the following: a power control parameter, Peak-to-peak PAPR parameters, the terminal types include: a near-end user, a mid-end user, or a remote user;
  • the power supply voltage of the power amplifier is dynamically controlled according to a total power variation of the output signal with respect to the signal to be transmitted.
  • the processor 501 is specifically configured to increase a power supply voltage of the power amplifier if the total power of the output signal is larger than the total power of the signal to be transmitted, or if the output signal is relative to the signal to be transmitted. The total power becomes smaller, reducing the power supply voltage of the power amplifier.
  • the processor 501 is specifically configured to adjust the power control parameter to reduce the power of the terminal type of the terminal user; or adjust the power control parameter to make the terminal type a mid-end user or a remote user. The power of the terminal is increased.
  • the processor 501 is specifically configured to adjust, according to the power control parameter, a first parameter value in the to-be-transmitted signal to obtain the output signal, where the first parameter value is used to indicate power adjustment of a carrier. a value, thereby controlling the transmission power of the n terminals.
  • the processor 501 is specifically configured to: use the to-be-transmitted signal as an input signal for the PAPR-reduced process; and perform a PAPR-down process on the PPR-reduced input signal according to the PPR-reduced parameter to obtain the output signal.
  • the power control device performs the power control method in FIG. 1 to FIG. 2 according to the instruction, and details are not described herein.
  • the steps of a method or algorithm described in connection with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both.
  • the software module can be placed in random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or technical field. Any other form of storage medium known.

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Abstract

本发明涉及一种功率控制方法及装置，所述方法包括：基站根据当前调度的n个终端的终端类型，分别确定所述n个终端的误差向量幅度EVM指标调整参数；根据所述n个终端的EVM指标调整参数，对所述n个终端的待传输信号进行处理得到输出信号，并确定所述输出信号相对于所述待传输信号的总功率变化；根据所述输出信号相对于所述待传输信号的总功率变化，动态控制功放的电源电压。本发明实施例提供的功率控制方法及装置，针对不同的终端的信号进行不同的处理，兼顾OFDM***的总功率、EVM、功放效率之间的平衡，提升OFDM***的***性能。

Description

功率控制方法及装置
本申请要求于2014年03月14日提交中国专利局、申请号为201410097526.6、发明名称为“功率控制方法及装置”的中国专利申请的优先权，其全部内容通过引用结合在本申请中。
技术领域
本发明涉及通信技术领域，尤其涉及一种功率控制方法及装置。
背景技术
正交频分复用(Orthogonal Frequency Division Multiplexing，OFDM)技术是当前广泛被采用的技术，其中当前最热门的通信标准长期演进(Long Term Evolution，LTE)采用的就是OFDM技术，OFDM技术将信道分成若干正交子信道，数据被调制到在每个子信道上进行传输。正交信号可以通过在接收端采用相关技术来分开，这样可以减少子信道间相互干扰，同时使得接收更加简单。
尽管OFDM技术具有很多优点，比如抗衰落能力强、频率利用率高等，但由于OFDM信号是由多个独立的经过调制的子载波信号相加而成的，这样的合成信号就有可能产生比较大的峰值功率，也就是峰平比(Peak to Averge Power Ratio，PAPR)很高，导致功放的效率降低。为了改善OFDM***的性能，基站一般需要通过降PAPR、控制用户的误差向量幅度(Error Vector Magnitude，EVM)等功率控制方法对信号进行处理。
然而，现有的功率控制方法，对整个频带的信号均作同样的处理，由于整个频带可能包含不同阶次的调制信号(即不同用户的信号)，而不同阶次 的调制信号对调制精度的要求是不同的，现有的功率控制处理方法无法做到对不同阶次的信号做不同处理以满足不同的需求，高阶(即近端用户)的精度往往比较差，无法兼顾到远近不同的用户，使OFDM***的整体性能受到限制。
发明内容
本发明提供一种功率控制方法及装置，针对不同的终端的信号进行不同的处理，兼顾OFDM***的总功率、EVM、功放效率之间的平衡，提升OFDM***的***性能。
本发明第一方面提供了一种功率控制方法，所述功率控制方法包括：
基站根据当前调度的n个终端的终端类型，分别确定所述n个终端的误差向量幅度EVM指标调整参数，其中n为正整数，所述EVM指标调整参数至少包括以下一种：功率控制参数，降峰平比PAPR参数，所述终端类型包括：近端用户、中端用户或远端用户；
所述基站根据所述n个终端的EVM指标调整参数，对所述n个终端的待传输信号进行处理得到输出信号，并确定所述输出信号相对于所述待传输信号的总功率变化；
所述基站根据所述输出信号相对于所述待传输信号的总功率变化，动态控制功放的电源电压。
结合第一方面，在第一方面的第一种可能的实施方式中，所述基站根据所述输出信号相对于所述待传输信号的总功率变化，动态控制功放的电源电压，包括：如果所述输出信号相对于所述待传输信号的总功率变大，增加所述功放的电源电压，或者，如果所述输出信号相对于所述待传输信号的总功率变小，减小所述功放的电源电压。
结合第一方面的第一种可能的实施方式，在第一方面的第二种可能的实施方式中，所述基站根据当前调度的n个终端的类型，确定所述n个终端的 误差向量幅度EVM指标调整参数，具体包括：
所述基站调整所述功率控制参数以使终端类型为近端用户的终端的功率减小；或者，
所述基站调整所述功率控制参数以使终端类型为中端用户或远端用户的终端的功率增大。
结合第一方面的第一种或第二种可能的实施方式，在第一方面的第三种可能的实施方式中，所述基站根据所述EVM指标调整参数，对待传输信号进行处理得到输出信号，具体为：
所述基站根据所述功率控制参数，对所述待传输信号中的第一参数值进行调整得到所述输出信号，所述第一参数值用于指示一个载波的功率调整值，从而控制所述n个终端的发射功率。
结合第一方面的第一种或第二种可能的实施方式，在第一方面的第四种可能的实施方式中，所述基站根据所述EVM指标调整参数，对待传输信号进行处理得到输出信号，具体为：
所述基站将所述待传输信号作为降PAPR处理的输入信号；
所述基站根据所述功率控制参数，对所述降PAPR处理的输入信号进行分频点的降PAPR处理得到所述输出信号。
结合第一方面的第四种可能的实施方式，在第一方面的第五种可能的实施方式中，所述降PAPR参数至少包括所述n个终端使用的频点Fi(i＝1,2,…,n)、所述n个终端使用的带宽Bi(i＝1,2,…,n)、参数Ci(i＝1,2,…,n)；
所述基站根据所述降PAPR参数，对所述降PAPR处理的输入信号进行分频点的降PAPR处理得到所述输出信号，具体包括：
S1、根据预设门限T对所述降PAPR处理的输入信号进行削峰处理得到削峰信号；
S2、将所述削峰信号分别经过n+1个滤波器fi(i＝0,1,2，…,n)进行 滤波处理得到n+1个滤波信号，其中,滤波器fi(i＝1,2，…,n)根据第i个终端使用的频点Fi和第i个终端使用的带宽Bi生成；
S3、将所述n+1个滤波信号分别乘以参数Ci(i＝0,1,2，…,n)得到n+1个调整信号；
S4、将所述n+1个调整信号与所述降PAPR处理的输入信号相加得到降PAPR处理信号；
S5、将所述降PAPR处理信号作为所述输出信号；或者，将所述将PAPR处理信号作为下一轮降PAPR处理的输入信号，重复执行S1-S4，直至所述所述降PAPR处理信号的幅度小于预设门限T或者执行次数达到预设执行次数，将所述降PAPR处理信号作为所述输出信号。
第二方面，本发明还提供了一种功率控制装置，所述功率控制装置包括：上层控制模块、处理模块和功放控制模块；
所述上层控制模块，用于根据当前调度的n个终端的终端类型，分别确定所述n个所述终端的误差向量幅度EVM指标调整参数，其中n为正整数，所述EVM指标调整参数至少包括以下一种：功率控制参数，降峰平比PAPR参数，所述终端类型包括：近端用户、中端用户或远端用户；
所述处理模块，用于根据所述上层控制模块配置的所述n个终端的EVM指标调整参数，对所述n个终端的待传输信号进行处理得到输出信号；
所述功放控制模块，用于确定经过所述处理模块处理后的所述输出信号相对于所述待传输信号的总功率变化，并根据所述输出信号相对于所述待传输信号的总功率变化，动态控制功放的电源电压。
结合第二方面，在第二方面的第一种可能的实施方式中，所述功放控制模块具体用于如果所述输出信号相对于所述待传输信号的总功率变大，增加所述功放的电源电压，或者，如果所述输出信号相对于所述待传输信号的总功率变小，减小所述功放的电源电压。
结合第二方面的第一种可能的实施方式，在第二方面的第二种可能的实 施方式中，所述上层控制模块具体用于调整所述功率控制参数以使终端类型为近端用户的终端的功率减小；或者，
调整所述功率控制参数以使终端类型为中端用户或远端用户的终端的功率增大。
结合第二方面的第一种或第二种可能的实施方式，在第二方面的第三种可能的实施方式中，所述处理模块包括：
用户功率配置模块，用于根据所述功率控制参数，对所述待传输信号中的第一参数值进行调整得到所述输出信号，所述第一参数值用于指示一个载波的功率调整值，从而控制所述n个终端的发射功率。
结合第二方面的第一种或第二种可能的实施方式，在第二方面的第四种可能的实施方式中，所述处理模块包括：
降PAPR模块，用于根据所述降PAPR参数，对降PAPR处理的输入信号进行分频点的降PAPR处理得到所述输出信号，所述降PAPR处理的输入信号为所述待传输信号。
结合第二方面的第四种可能的实施方式，在第二方面的第五种可能的实施方式中，所述上层控制模块配置的所述降PAPR参数至少包括所述n个终端使用的频点Fi(i＝1,2,…,n)、所述n个终端使用的带宽Bi(i＝1,2,…,n)、参数Ci(i＝1,2,…,n)；
所述降PAPR模块具体用于执行以下步骤：
S1、根据预设门限T对所述降PAPR处理的输入信号进行削峰处理得到削峰信号；
S2、将所述削峰信号分别经过n+1个滤波器fi(i＝0,1,2，…,n)进行滤波处理得到n+1个滤波信号，其中,滤波器fi(i＝1,2，…,n)根据第i个终端使用的频点Fi和第i个终端使用的带宽Bi生成；
S3、将所述n+1个滤波信号分别乘以参数Ci(i＝0,1,2，…,n)得到n+1个调整信号；
S4、将所述n+1个调整信号与所述降PAPR处理的输入信号相加得到降PAPR处理信号；
S5、将所述降PAPR处理信号作为所述输出信号；或者，将所述将PAPR处理信号作为下一轮降PAPR处理的输入信号，重复执行S1-S4，直至所述所述降PAPR处理信号的幅度小于预设门限T或者执行次数达到预设执行次数，将所述降PAPR处理信号作为所述输出信号。
结合第二方面，在第二方面的第六种可能的实施方式中，所述功率控制装置为无线基站NodeB或演进型基站eNodeB或无线网络控制器RNC。
本发明提供的功率控制方法及装置，针对不同的终端配置不同的用户功率，进行不同的处理，可以同时兼顾OFDM***的总功率、EVM、功放效率等之间的平衡，提升OFDM***的***性能。
附图说明
为了更清楚地说明本发明实施例中的技术方案，下面将对实施例描述中所需要使用的附图作简单地介绍，显而易见地，下面描述中的附图仅仅是本发明的一些实施例，对于本领域普通技术人员来讲，在不付出创造性劳动性的前提下，还可以根据这些附图获得其他的附图。
图1为本发明实施例提供的功率控制方法流程图；
图2为本发明实施例提供的降PAPR的处理流程图；
图3为本发明实施例提供的功率控制装置结构示意图；
图4为本发明实施例提供的降PAPR模块示意图；
图5为本发明实施例提供的功率控制装置的组成结构示意图。
具体实施方式
为使得本发明的发明目的、特征、优点能够更加的明显和易懂，下面将结合本发明实施例中的附图，对本发明实施例中的技术方案进行描述，显然， 所描述的实施例仅仅是本发明一部分实施例，而非全部实施例。基于本发明中的实施例，本领域普通技术人员在没有做出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
本发明实施例提供的功率控制方法及装置，适用于采用OFDM技术的通信***，如LTE等通信***，尤其适用于对功率控制的效率和精度有较高要求的通信***。本发明实施例提供的功率控制方法可在无线基站NodeB或演进型基站eNodeB或无线网络控制器RNC等设备中实现，功率控制装置可以为NodeB或eNodeB或RNC等设备。
图1是本实施例提供的功率控制方法流程图，如图1所示，本发明的功率控制方法包括：
S101、基站根据当前调度的n个终端的终端类型，分别确定所述n个终端的EVM指标调整参数，其中n为正整数。
所述终端的类型包括：近端用户、中端用户或远端用户。具体地，基站可以根据终端的信干噪比(Signal to Interference and Noise Ratio，SINR)，确定所述终端的类型。一般基站可以通过终端上报的信道质量指示(Channel Quality Indicator，CQI)折算得到SINR，将终端进行区分，分成远端用户、近端用户,比如将SINR<5dB(Decibel)的用户标记为远端用户、将SINR>20dB的用户标记为近端用户，将5dB<SINR<20dB的用户标记为中端用户。
所述EVM指标调整参数至少包括以下一种：功率控制参数、降PAPR参数。
S102、基站根据所述n个终端的EVM指标调整参数，对所述n个终端的待传输信号进行处理得到输出信号。
第一种情形：所述EVM指标调整参数包括功率控制参数。
所述基站根据当前调度的n个终端的类型，确定所述n个终端的误差向量幅度EVM指标调整参数，具体包括：
所述基站调整所述功率控制参数以使终端类型为近端用户的终端的功率减小。
或者，所述基站调整所述功率控制参数以使终端类型为中端用户或远端用户的终端的功率增大。
所述功率控制参数主要包括PA值和PB值(请参见3GPP协议中36213-b40的5.2中的定义)，通常(PA，PB)＝(-3,1)。其中，PA是ρa的一个dB值，ρa表示不含导频的那列符号每个资源单元(Resource Element，RE)的功率与导频信号功率的比值；PB指示导频功率boost信息，该值为线性值，同时指示了ρb/ρa的值，其中，ρb分别表示含导频符号的RE的功率与导频信号功率的比值。
如果当前调度的终端的类型为近端用户，则调整该用户的功率控制参数以减小该用户的功率，例如PA、PB值由原来的(-3,1)调整为(-4.77,2)。如果当前调度的终端的类型为远端用户，则调整该用户的功率控制参数以增大该用户的功率，例如PA、PB值由原来的(-3,1)调整为(0,0)。
例如，在LTE***中，如果当前调度的终端的类型是近端用户，则该用户的PA值由原来的0降为-3。这样，可以降低整个小区的发射总功率，在保持整个降PAPR参数不变的情况下，当前用户的EVM变小(也就是说当前用户的信号与理想信号的差异变小)，等效于提升信噪比，从而提升当前用户的吞吐量。如果当前调度的终端的类型为远端用户，则将该用户的PA值增大，例如PA值由原来的-3变为0，在保持整个降PAPR参数不变的情况下，远端用户的EVM变差，但该用户的功率被抬高，同时由于QPSK对EVM的容忍度相对较高，所以该用户的总体性能得到提升。
则S102中根据所述EVM指标调整参数，对待传输信号进行处理得到输出信号，具体为：基站根据所述功率控制参数，对待传输信号进行处理得到输出信号。
基站通过所述功率控制参数控制所述终端的功率。
基站根据所述功率控制参数，对待传输信号进行处理，具体包括：基站根据所述功率控制参数，对所述待传输信号中的第一参数值进行调整得到所 述输出信号，所述第一参数值用于指示一个载波的功率调整值，从而控制所述n个终端的发射功率。针对不同远近的终端，通过调整待传输信号中的第一参数值控制所述终端的发射功率。
第二种情形：所述EVM指标调整参数包括降PAPR参数。
具体地，所述降PAPR参数可以包括预设门限T、最大迭代次数、所述n个终端使用的频点Fi(i＝1,2,…,n)、所述n个终端使用的带宽Bi(i＝1,2,…,n)、参数Ci(i＝1,2,…,n)。
则S102中根据所述EVM指标调整参数，对待传输信号进行处理得到输出信号，具体为：基站根据所述降PAPR参数，对待传输信号进行处理得到输出信号。
基站根据所述降PAPR参数，对待传输信号进行处理得到输出信号，具体为：基站将所述待传输信号作为降PAPR处理的输入信号；基站根据所述降PAPR参数，对所述降PAPR处理的输入信号进行分频点的降PAPR处理得到所述输出信号。如图2所示，具体包括：
S201、根据预设门限T对所述降PAPR处理的输入信号进行削峰处理得到削峰信号。
具体地，先找出输入信号S中幅度超过所述预设门限T的位置，然后在所找出的位置上生成削峰信号S’。
S202、将所述削峰信号分别经过n+1个滤波器fi(i＝0,1,2，…,n)进行滤波处理得到n+1个滤波信号，其中,滤波器fi(i＝1,2，…,n)根据第i个终端使用的频点Fi和第i个终端使用的带宽Bi生成。具体包括：
S2021、将所述削峰信号S’经过滤波器f0进行滤波处理。
S2022、将经过所述滤波器f0得到的信号乘以参数C0。
S2023、根据上层指示的频点Fi和带宽Bi信息生成n个滤波器fi(i＝1,2,…,n)。
S2024、将所述削峰信号S’经过所述n个滤波器fi(i＝1,2,…,n)进行 滤波处理得到滤波信号。
S203、将所述n+1个滤波信号分别乘以参数Ci(i＝0,1,2，…,n)得到n+1个调整信号。
S204、将所述n+1个调整信号与所述降PAPR处理的输入信号相加得到降PAPR处理信号。
将所述待传输信号S与步骤S2022和步骤S2024得到的信号相加。
S205、将所述降PAPR处理信号作为所述输出信号。
对所述S204得到的信号作为所述输出信号，或者，将所述将PAPR处理信号作为下一轮降PAPR处理的输入信号，重复执行S201～S204，直到所述信号的幅度小于预设门限T或者迭代次数达到最大迭代次数，将所述降PAPR处理信号作为所述输出信号。
降PAPR的处理过程有可能会引入EVM恶化，由于降PAPR参数中的门限T越大，EVM越小，反之则相反。EVM越小，性能越好。现有技术中对终端进行相同的降PAPR处理，不区分远近用户，因而，在进行降PAPR处理时通常会引入EVM，造成***整体性能下降。不同调制方式可以容忍的EVM不同，调制方式越高，容忍度越小。比如标准3GPPTS36104-b40给出的QPSK、16QAM、64QAM调制方式的指标分别为17.5％、12.5％、8％。在本发明实施例中，针对远近不同的终端采用不同的调制方式，可以进行不同的降PAPR处理，这样通过分频点的降PAPR处理，可以有效地兼顾OFDM***中EVM、功放效率之间的平衡，提升OFDM***的***性能。
例如，在LTE***中，如果当前的带宽是20M，当前的带宽被分配给2个用户，其中一个为远端用户(采用QPSK调制)，另一个为近端用户(采用64QAM调制)，分别占用了前、后半带宽(各10M)。假设上层配置的功率控制参数不变，降PAPR的门限T也不变，在后面的叠加噪声处理上作如下处理：假设C0为1，将远端用户的频带上噪声加大(比如将C1设成0.5)，将近端用户的频带上噪声减小(比如将C2设成-0.5)，这样使得近端用户的EVM比 没有上述处理的EVM小，远端用户的则相反，近端的性能得到提升，由于QPSK对EVM的容忍度相对较高，远端用户的性能也不一定会下降。
需要说明的是，在本发明实施例中，可以仅第一种情形的方法对所述待传输信号进行处理，从而进行用户级功率配置以控制整个小区的发射总功率，提升OFDM***的***性能，也可以仅采用第二种情形的方法对所述待传输信号进行处理，即在当前终端的功率控制参数不变的情况下，可以根据终端的类型，进行不同的EVM指标参数的调整，从而进行降PAPR处理以对不同远近点的终端进行不同的处理，提高功放的效率，满足不同的需求，同时，也可以采用两种情形的方法相结合的方式对所述待传输信号进行处理，例如，在当前终端增加功率控制参数的情况下，可以调整降PAPR参数(Ci)使得该终端可以增加更多的噪声，相反地，则可以减少噪声。
这样，本发明提供的功率控制方法可以针对不同的终端的信号进行不同的处理，兼顾OFDM***的总功率、EVM、功放效率之间的平衡，提升OFDM***的***性能。
例如，在LTE***中，如果当前的带宽是20M，当前的带宽被分配给2个终端，其中一个为远端用户采用QPSK调制，另一个为近端用户采用64QAM调制，分别占用了前、后半带宽(各10M)。假设上层给远端用户提高功率控制参数，比如将该用户的PA值加大，比如由原来的-1变成1，同时假设降PAPR的门限T不变，在后面的降PAPR处理上作如下处理：假设C0为1，将远端用户的频带上噪声加大，比如将C1设成0.5，将近端用户的频带上噪声减小，比如将C2设成-0.5，这样使得近端用户的EVM比没有上述处理的EVM小，远端用户的则相反，近端的性能得到提升，由于QPSK对EVM的容忍度相对较高，远端用户的性能也不一定会下降。
继续参见图1，S103、基站确定所述输出信号相对于所述待传输信号的总功率变化。
基站根据S101～S102方法的处理结果(可以包括：仅经过第一种情形的 处理或者仅经过第二种情形的处理或者经过两种情形结合的处理)，确定最后的输出信号相对于所述待传输信号的总功率变化。
S104、基站根据所述输出信号相对于所述待传输信号的总功率变化，动态控制功放的电源电压。
如果所述输出信号相对于所述待传输信号的总功率变大，增加所述功放的电源电压，如果所述输出信号相对于所述待传输信号的总功率变小，减小所述功放的电源电压。
例如，在LTE***中，假设上层降低了当前所有(或部分)终端的功率控制参数，也就是说功放输出的功率变小，这时将功放的电源电压调低；相反，如果上层增加了当前所有(或部分)用户的功率，将功放的电源电压调高。这样使得功放的电源电压与实际的输出功率相匹配。
本发明实施例提供的功率控制方法，通过功率控制参数控制不同终端的功率，针对不同远近的终端采用不同的降PAPR处理，使得不同的终端可以有不同的调度策略，同时兼顾OFDM***的总功率、EVM、功放效率等之间的平衡，提升OFDM***的整体性能。
图3是本实施例提供的功率控制装置示意图，如图3所示，本发明的功率控制装置包括：上层控制模块301、处理模块302和功放控制模块303。
上层控制模块301用于根据当前调度的n个终端的终端类型，分别确定所述n个终端的EVM指标调整参数，其中n为正整数。
所述终端的类型包括：近端用户、中端用户或远端用户。具体地，基站可以根据终端的SINR，确定所述终端的类型。一般基站可以通过终端上报的CQI折算得到SINR，将终端进行区分，分成远端用户、近端用户,比如将SINR<5dB(Decibel)的用户标记为远端用户、将SINR>20dB的用户标记为近端用户，将5dB<SINR<20dB的用户标记为中端用户。
上层控制模块301配置的EVM指标调整参数至少包括以下一种：功率控制参数、降PAPR参数。
第一种情形：上层控制模块301配置的EVM指标调整参数包括功率控制参数。
上层控制模块301具体用于调整所述功率控制参数以使终端类型为近端用户的终端的功率减小。或者，上层控制模块301具体用于调整所述功率控制参数以使终端类型为中端用户或远端用户的终端的功率增大。基站通过所述功率控制参数控制所述终端的功率。
所述功率控制参数包括PA值和PB值，通常(PA，PB)＝(-3,1)。如果当前调度的终端的类型为近端用户，上层控制模块301则调整该用户的功率控制参数以减小该用户的功率，例如PA、PB值由原来的(-3,1)调整为(-4.77,2)。如果当前调度的终端的类型为远端用户，上层控制模块301则调整该用户的功率控制参数以增大该用户的功率，例如PA、PB值由原来的(-3,1)调整为(0,0)。
第二种情形：上层控制模块301配置的EVM指标调整参数包括降PAPR参数。
上层控制模块301配置的所述降PAPR参数可以包括预设门限T、最大迭代次数、所述n个终端使用的频点Fi(i＝1,2,…,n)、所述n个终端使用的带宽Bi(i＝1,2,…,n)、参数Ci(i＝1,2,…,n)。
处理模块302用于根据上层控制模块301配置的所述EVM指标调整参数，对待传输信号进行处理得到输出信号。
处理模块302包括用户功率配置模块3021和/或降PAPR模块3022。
用户功率配置模块3021用于根据所述功率控制参数，对所述待传输信号中的第一参数值进行调整得到所述输出信号，所述第一参数值用于指示一个载波的功率调整值，从而控制所述n个终端的发射功率。
降PAPR模块3022用于根据所述降PAPR参数，对降PAPR处理的输入信号进行分频点的降PAPR处理得到所述输出信号，所述降PAPR处理的输入信号为所述待传输信号或用户功率配置模块3021输出的信号。
如图4所示，降PAPR模块3022具体包括第一判断单元401、第二判断单元402、削峰单元403、多个滤波器404、多个乘法器405、加法器406，具体用于执行步骤如图2所示。
第一判断单元401用于判断迭代次数是否小于最大迭代次数M，如果是，则进入第二判断单元402，否则结束。
第二判断单元402用于判断待传输信号S的幅度是否超过所述预设门限T，如果是，则进入削峰单元403，产生削峰信号S’，否则结束。
削峰单元403产生的削峰信号S’分别进入多个滤波器404和乘法器405，最后，通过加法器406将经过各个乘法器405得到的信号相加，返回到第一判断单元401进行重复迭代。其中，滤波器fi(i＝1,2,…,n)分别有不同的频点Fi和带宽Bi。
具体地，降PAPR模块3022的执行步骤可以如图2所示。
功放控制模块303用于确定所述待传输信号经过处理模块302处理后的输出信号的总功率变化，并根据所述输出信号的总功率变化，动态控制功放的电源电压。
如果所述输出信号的总功率变大，功放控制模块303增加所述功放的电源电压。如果所述输出信号的总功率变小，功放控制模块303减小所述功放的电源电压。
本发明提供的功率控制方法及装置，通过功率控制参数控制不同终端的功率，针对不同远近的终端采用不同的降PAPR处理，使得不同的终端可以有不同的调度策略，同时兼顾OFDM***的总功率、EVM、功放效率等之间的平衡，提升OFDM***的整体性能。
图5为本发明实施例提供的功率控制装置的组成结构示意图，如图5所示，所述功率控制装置包括：处理器501、收发器502和存储器503。
处理器501可能为单核或多核中央处理单元(Central Processing Unit，CPU)，或者为特定集成电路(Application Specific Integrated Circuit， ASIC)，或者为被配置成实施本发明实施例的一个或多个集成电路。
收发器502用于与用户设备进行交互。
存储器503用于存储程序。
处理器501调用存储器503存储的所述程序，用于执行：
根据当前调度的n个终端的终端类型，分别确定所述n个终端的误差向量幅度EVM指标调整参数，其中n为正整数，所述EVM指标调整参数至少包括以下一种：功率控制参数，降峰平比PAPR参数，所述终端类型包括：近端用户、中端用户或远端用户；
根据所述n个终端的EVM指标调整参数，对所述n个终端的待传输信号进行处理得到输出信号，并确定所述输出信号相对于所述待传输信号的总功率变化；
根据所述输出信号相对于所述待传输信号的总功率变化，动态控制功放的电源电压。
进一步的，处理器501具体用于如果所述输出信号相对于所述待传输信号的总功率变大，增加所述功放的电源电压，或者，如果所述输出信号相对于所述待传输信号的总功率变小，减小所述功放的电源电压。
进一步的，处理器501具体用于调整所述功率控制参数以使终端类型为近端用户的终端的功率减小；或者，调整所述功率控制参数以使终端类型为中端用户或远端用户的终端的功率增大。
进一步的，处理器501具体用于根据所述功率控制参数，对所述待传输信号中的第一参数值进行调整得到所述输出信号，所述第一参数值用于指示一个载波的功率调整值，从而控制所述n个终端的发射功率。
进一步的，处理器501具体用于将所述待传输信号作为降PAPR处理的输入信号；根据所述降PAPR参数，对所述降PAPR处理的输入信号进行分频点的降PAPR处理得到所述输出信号。
进一步的，所述降PAPR参数至少包括所述n个终端使用的频点 Fi(i＝1,2,…,n)、所述n个终端使用的带宽Bi(i＝1,2,…,n)、参数Ci(i＝1,2,…,n)。
具体地，功率控制装置还根据所述指令执行图1～图2中的功率控制方法，具体在此不再赘述。
专业人员应该还可以进一步意识到，结合本文中所公开的实施例描述的各示例的单元及算法步骤，能够以电子硬件、计算机软件或者二者的结合来实现，为了清楚地说明硬件和软件的可互换性，在上述说明中已经按照功能一般性地描述了各示例的组成及步骤。这些功能究竟以硬件还是软件方式来执行，取决于技术方案的特定应用和设计约束条件。专业技术人员可以对每个特定的应用来使用不同方法来实现所描述的功能，但是这种实现不应认为超出本发明的范围。
结合本文中所公开的实施例描述的方法或算法的步骤可以用硬件、处理器执行的软件模块，或者二者的结合来实施。软件模块可以置于随机存储器(RAM)、内存、只读存储器(ROM)、电可编程ROM、电可擦除可编程ROM、寄存器、硬盘、可移动磁盘、CD-ROM、或技术领域内所公知的任意其它形式的存储介质中。
以上所述的具体实施方式，对本发明的目的、技术方案和有益效果进行了进一步详细说明，所应理解的是，以上所述仅为本发明的具体实施方式而已，并不用于限定本发明的保护范围，凡在本发明的精神和原则之内，所做的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (13)

  1. 一种功率控制方法，其特征在于，所述方法包括：
    基站根据当前调度的n个终端的终端类型，分别确定所述n个终端的误差向量幅度EVM指标调整参数，其中n为正整数，所述EVM指标调整参数至少包括以下一种：功率控制参数，降峰平比PAPR参数，所述终端类型包括：近端用户、中端用户或远端用户；
    所述基站根据所述n个终端的EVM指标调整参数，对所述n个终端的待传输信号进行处理得到输出信号，并确定所述输出信号相对于所述待传输信号的总功率变化；
    所述基站根据所述输出信号相对于所述待传输信号的总功率变化，动态控制功放的电源电压。
  2. 根据权利要求1所述的方法，所述基站根据所述输出信号相对于所述待传输信号的总功率变化，动态控制功放的电源电压，包括：如果所述输出信号相对于所述待传输信号的总功率变大，增加所述功放的电源电压，或者，如果所述输出信号相对于所述待传输信号的总功率变小，减小所述功放的电源电压。
  3. 根据权利要求2所述的方法，其特征在于，所述基站根据当前调度的n个终端的类型，确定所述n个终端的误差向量幅度EVM指标调整参数，具体包括：
    所述基站调整所述功率控制参数以使终端类型为近端用户的终端的功率减小；或者，
    所述基站调整所述功率控制参数以使终端类型为中端用户或远端用户的终端的功率增大。
  4. 根据权利要求2～3任一项所述的方法，其特征在于，所述基站根据所述EVM指标调整参数，对待传输信号进行处理得到输出信号，具体为：
    所述基站根据所述功率控制参数，对所述待传输信号中的第一参数值进 行调整得到所述输出信号，所述第一参数值用于指示一个载波的功率调整值，从而控制所述n个终端的发射功率。
  5. 根据权利要求2～3任一项所述的方法，其特征在于，所述基站根据所述EVM指标调整参数，对待传输信号进行处理得到输出信号，具体为：
    所述基站将所述待传输信号作为降PAPR处理的输入信号；
    所述基站根据所述降PAPR参数，对所述降PAPR处理的输入信号进行分频点的降PAPR处理得到所述输出信号。
  6. 根据权利要求5所述的方法，其特征在于，所述降PAPR参数至少包括所述n个终端使用的频点Fi(i＝1,2,…,n)、所述n个终端使用的带宽Bi(i＝1,2,…,n)、参数Ci(i＝1,2,…,n)；
    所述基站根据所述降PAPR参数，对所述降PAPR处理的输入信号进行分频点的降PAPR处理得到所述输出信号，具体包括：
    S1、根据预设门限T对所述降PAPR处理的输入信号进行削峰处理得到削峰信号；
    S2、将所述削峰信号分别经过n+1个滤波器fi(i＝0,1,2，…,n)进行滤波处理得到n+1个滤波信号，其中,滤波器fi(i＝1,2，…,n)根据第i个终端使用的频点Fi和第i个终端使用的带宽Bi生成；
    S3、将所述n+1个滤波信号分别乘以参数Ci(i＝0,1,2，…,n)得到n+1个调整信号；
    S4、将所述n+1个调整信号与所述降PAPR处理的输入信号相加得到降PAPR处理信号；
    S5、将所述降PAPR处理信号作为所述输出信号；或者，将所述将PAPR处理信号作为下一轮降PAPR处理的输入信号，重复执行S1-S4，直至所述所述降PAPR处理信号的幅度小于预设门限T或者执行次数达到预设执行次数，将所述降PAPR处理信号作为所述输出信号。
  7. 一种功率控制装置，其特征在于，所述装置包括：上层控制模块、处 理模块和功放控制模块；
    所述上层控制模块，用于根据当前调度的n个终端的终端类型，分别确定所述n个终端的误差向量幅度EVM指标调整参数，其中n为正整数，所述EVM指标调整参数至少包括以下一种：功率控制参数，降峰平比PAPR参数，所述终端类型包括：近端用户、中端用户或远端用户；
    所述处理模块，用于根据所述上层控制模块配置的所述n个终端的EVM指标调整参数，对所述n个终端的待传输信号进行处理得到输出信号；
    所述功放控制模块，用于确定经过所述处理模块处理后的所述输出信号相对于所述待传输信号的总功率变化，并根据所述输出信号相对于所述待传输信号的总功率变化，动态控制功放的电源电压。
  8. 根据权利要求7所述的装置，其特征在于，所述功放控制模块具体用于如果所述输出信号相对于所述待传输信号的总功率变大，增加所述功放的电源电压，或者，如果所述输出信号相对于所述待传输信号的总功率变小，减小所述功放的电源电压。
  9. 根据权利要求8所述的装置，其特征在于，所述上层控制模块具体用于调整所述功率控制参数以使终端类型为近端用户的终端的功率减小；或者，
    调整所述功率控制参数以使终端类型为中端用户或远端用户的终端的功率增大。
  10. 根据权利要求8～9任一项所述的装置，其特征在于，所述处理模块包括：
    用户功率配置模块，用于根据所述功率控制参数，对所述待传输信号中的第一参数值进行调整得到所述输出信号，所述第一参数值用于指示一个载波的功率调整值，从而控制所述n个终端的发射功率。
  11. 根据权利要求8～9任一项所述的装置，其特征在于，所述处理模块包括：
    降PAPR模块，用于根据所述降PAPR参数，对降PAPR处理的输入信号进 行分频点的降PAPR处理得到所述输出信号，所述降PAPR处理的输入信号为所述待传输信号。
  12. 根据权利要求11所述的装置，其特征在于，所述上层控制模块配置的所述降PAPR参数至少包括所述n个终端使用的频点Fi(i＝1,2,…,n)、所述n个终端使用的带宽Bi(i＝1,2,…,n)、参数Ci(i＝1,2,…,n)；
    所述降PAPR模块具体用于执行以下步骤：
    S1、根据预设门限T对所述降PAPR处理的输入信号进行削峰处理得到削峰信号；
    S2、将所述削峰信号分别经过n+1个滤波器fi(i＝0,1,2，…,n)进行滤波处理得到n+1个滤波信号，其中,滤波器fi(i＝1,2，…,n)根据第i个终端使用的频点Fi和第i个终端使用的带宽Bi生成；
    S3、将所述n+1个滤波信号分别乘以参数Ci(i＝0,1,2，…,n)得到n+1个调整信号；
    S4、将所述n+1个调整信号与所述降PAPR处理的输入信号相加得到降PAPR处理信号；
    S5、将所述降PAPR处理信号作为所述输出信号；或者，将所述将PAPR处理信号作为下一轮降PAPR处理的输入信号，重复执行S1-S4，直至所述所述降PAPR处理信号的幅度小于预设门限T或者执行次数达到预设执行次数，将所述降PAPR处理信号作为所述输出信号。
  13. 根据权利要求7所述的装置，其特征在于，所述功率控制装置为无线基站NodeB或演进型基站eNodeB或无线网络控制器RNC。
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