WO2017005161A1 - Procédé et dispositif d'attribution de puissance - Google Patents

Procédé et dispositif d'attribution de puissance Download PDF

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Publication number
WO2017005161A1
WO2017005161A1 PCT/CN2016/088515 CN2016088515W WO2017005161A1 WO 2017005161 A1 WO2017005161 A1 WO 2017005161A1 CN 2016088515 W CN2016088515 W CN 2016088515W WO 2017005161 A1 WO2017005161 A1 WO 2017005161A1
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Prior art keywords
value
power allocation
subcarrier
signal
power
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PCT/CN2016/088515
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English (en)
Chinese (zh)
Inventor
梅林�
孙文彬
沙学军
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华为技术有限公司
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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
    • H04W52/30—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
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/003—Arrangements for allocating sub-channels of the transmission path
    • H04L5/0044—Arrangements for allocating sub-channels of the transmission path allocation of payload
    • 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

Definitions

  • Embodiments of the present invention relate to communication technologies, and in particular, to a power allocation method and apparatus.
  • the capacity of the communication system is related to the signal-to-noise power ratio.
  • the capacity of the communication system is related to the signal-to-noise power ratio.
  • the selective fading channel since each sub-channel experiences different fading, how to allocate the appropriate sub-channel power so that the capacity of the channel reaches or approaches the maximum value. It has become a very important issue.
  • the uplink uses Single-Carrier Frequency-Division Multiple Access (SC-FDMA) technology, and the downlink is used.
  • SC-FDMA Single-Carrier Frequency-Division Multiple Access
  • OFDMA Orthogonal Frequency Division Multiplexing Access
  • SC-FDE single-carrier frequency domain equalization
  • Embodiments of the present invention provide a power allocation method and apparatus, which are capable of performing power allocation for a hybrid carrier system, thereby improving communication performance of the system.
  • an embodiment of the present invention provides a power allocation method, including:
  • the first weight value is used to represent a proportion of the first power allocation value in the hybrid carrier system
  • the second weight value is used to represent the second power allocation value a proportion of the hybrid carrier system that is a system of the SC-FDE system and the OFDM system
  • the first power allocation value, the second power allocation value, and the first weight value and the second weight determines a third power allocation value of each subcarrier in the hybrid carrier system, including:
  • the determining, by the fading value of each subcarrier, determining a single carrier frequency domain equalization SC-FDE includes:
  • the maximum value of the channel capacity is obtained by an optimization algorithm, and the maximum value of the channel capacity is used as the first power allocation value.
  • the determining the single carrier frequency domain equalization SC-FDE according to the fading value of each subcarrier includes:
  • N represents the length of the discrete Fourier transform DFT
  • h i represents the fading value of the i-th frequency point on the channel.
  • the determining, according to the fading value of each subcarrier, the second power allocation value of each subcarrier in the OFDM system including:
  • the maximum value of the channel capacity is obtained by an optimization algorithm, and the maximum value of the channel capacity is used as the second power allocation value.
  • the fading according to each subcarrier And determining a second power allocation value of each subcarrier in the orthogonal frequency division multiplexing OFDM system including:
  • ⁇ represents the signal-to-noise ratio
  • E b represents the energy per bit signal
  • N 0 represents the noise power spectral density
  • a seventh possible implementation manner of the first aspect after performing power allocation on the first frequency domain signal according to the third power allocation value ,Also includes:
  • the processed signal is subjected to digital-to-analog conversion to obtain a converted signal, and the converted signal is transmitted to a receiving side device.
  • the method further includes:
  • the equalized signal is extracted by power, and the equalized signal after the extracted power is subjected to WFRFT processing of ⁇ -1 order to obtain the input signal.
  • indication information is used to indicate whether to use the third power allocation value to perform power allocation on an input signal on each subcarrier in the hybrid carrier system.
  • an embodiment of the present invention provides a power distribution apparatus, including:
  • a determining module configured to determine, according to a fading value of each subcarrier, a first power allocation value of each subcarrier in a single carrier frequency domain equalization SC-FDE system and a second power of each subcarrier in an orthogonal frequency division multiplexing OFDM system Assignment value
  • the determining module is further configured to determine a first weight value of the SC-FDE system and a second weight value of the OFDM system according to a preset parameter; the first weight value is used to indicate the first power allocation a proportion of the value in the hybrid carrier system, the second weight value is used to indicate a proportion of the second power allocation value in the hybrid carrier system, and the hybrid carrier system is the SC a system comprising a FDE system and said OFDM system;
  • the determining module is further configured to determine, according to the first power allocation value, the second power allocation value, and the first weight value and the second weight value, a third power of each subcarrier in the hybrid carrier system. Assignment value
  • An allocating module configured to perform, according to the third power allocation value, each of the hybrid carrier systems
  • the input signal on the subcarrier is used for power distribution.
  • the determining module is configured to allocate a value to the first power according to the first weight value and the second weight value And linearly weighting the second power allocation value to obtain the third power allocation value.
  • the determining module is specifically configured to:
  • the maximum value of the channel capacity is obtained by an optimization algorithm, and the maximum value of the channel capacity is used as the first power allocation value.
  • the determining module is specifically configured to:
  • N represents the length of the discrete Fourier transform DFT
  • h i represents the fading value of the i-th frequency point on the channel.
  • the determining module is specifically used to :
  • the maximum value of the channel capacity is obtained by an optimization algorithm, and the maximum value of the channel capacity is used as the second power allocation value.
  • the determining module is specifically used According to the formula Determining a second power allocation value p ofdm,i of the i-th subcarrier in the OFDM system;
  • ⁇ represents the signal-to-noise ratio
  • E b represents the energy per bit signal
  • N 0 represents the noise power spectral density
  • a converting unit configured to perform serial/parallel conversion and - ⁇ +1 order weighted fractional Fourier transform WFRFT transform on the input signal to obtain a first frequency domain signal
  • an allocating unit configured to perform power allocation on the first frequency domain signal on each subcarrier according to the third power allocation value.
  • the device further includes:
  • a processing module configured to sequentially perform N-point discrete Fourier transform IDFT, parallel/serial conversion, and add cyclic prefix processing on the first frequency domain signal to obtain a processing signal;
  • a conversion module configured to perform digital/analog conversion on the processed signal to obtain a converted signal
  • a sending module configured to send the conversion signal to the receiving side device.
  • the converting module is further configured to perform analog/digital conversion on the converted signal, and remove the Cyclic prefix, serial/parallel conversion, and N-point DFT transform to obtain a second frequency domain signal;
  • the processing module is further configured to perform frequency domain zero-forcing equalization ZF processing on the second frequency domain signal according to the equalization matrix to obtain an equalized signal;
  • the processing module is further configured to perform power extraction on the equalized signal, and perform WFRFT processing of ⁇ -1 order on the equalized signal after extracting power to obtain the input signal.
  • the method is further configured to send indication information to the receiving side device, where the indication information is used to indicate whether to use the third power allocation value to perform power allocation on an input signal on each subcarrier in the hybrid carrier system.
  • the power allocation method and apparatus determine the first power allocation value and the orthogonal frequency division multiplexing OFDM of each subcarrier in the single carrier frequency domain equalized SC-FDE system according to the fading value of each subcarrier. a second power allocation value of each subcarrier in the system, and determining a first weight value of the SC-FDE system and a second weight value of the OFDM system according to the preset parameter, according to the first power allocation value, the second power allocation value, and the A weight value and a second weight value determine a third power allocation value of each subcarrier in the hybrid carrier system, and perform power allocation on the input signals on each subcarrier in the hybrid carrier system according to the third power allocation value. Since the power allocation modes of the SC-FDE system and the OFDM system are comprehensively considered, the power distribution of the hybrid carrier system is performed, thereby improving the communication performance of the system.
  • FIG. 1 is a schematic flowchart diagram of Embodiment 1 of a power distribution method according to the present invention
  • Embodiment 2 is a schematic flowchart of Embodiment 2 of a power distribution method according to the present invention
  • Embodiment 3 is a schematic flowchart of Embodiment 3 of a power distribution method according to the present invention.
  • Embodiment 4 is a schematic flowchart of Embodiment 4 of a power distribution method according to the present invention.
  • FIG. 5 is a schematic flowchart of Embodiment 5 of a power allocation method according to the present invention.
  • Embodiment 6 is a signaling diagram of Embodiment 6 of a power allocation method according to the present invention.
  • FIG. 7 is a schematic structural diagram of Embodiment 1 of a power distribution device according to the present invention.
  • Embodiment 8 is a schematic structural diagram of Embodiment 2 of a power distribution device according to the present invention.
  • Embodiment 9 is a schematic structural diagram of Embodiment 3 of a power distribution device according to the present invention.
  • Embodiment 4 of a power distribution device according to the present invention.
  • Embodiment 5 of a power distribution device according to the present invention.
  • Embodiment 1 of a transmitting device according to the present invention.
  • FIG. 13 is a schematic structural diagram of Embodiment 1 of a receiving device according to the present invention.
  • the embodiment of the present invention is applicable to a hybrid carrier system, and is specifically applicable to a scenario in which a weighted-type fractional Fourier transform (WFRFT) signal is used for power allocation in a hybrid carrier system, and the hybrid carrier system utilizes
  • WFRFT weighted-type fractional Fourier transform
  • WFRFT WFRFT
  • ⁇ is the order WFRFT transform
  • X 0 is an arbitrary complex sequence
  • ⁇ X 0, X 1, X 2, X 3 ⁇ are X 0 ⁇ 3 times normalized dispersion 0 fourier Leaf transformation
  • the definition of the normalized discrete Fourier transform is: Where j denotes an imaginary unit, n denotes the sequence number of each element in the X 1 sequence, N denotes the length of the discrete Fourier transform DFT, k denotes the sequence number of each element in the X 0 sequence, w 0 , w 1 in the formula (1), w 2 and w 3 are weighting coefficients, respectively, which can be calculated according to formula (2):
  • m k and n k are preset parameters, and the values may be set according to experience or actual conditions.
  • the specific values of m k and n k are not limited in this embodiment.
  • the parameter defined by formula (1)(2) is single parameter WFRFT, and when V ⁇ 0, it is called multi-parameter WFRFT.
  • the single-parameter WFRFT is controlled by the parameter ⁇ and has the same cycle characteristic as the Fourier transform, usually ⁇ takes a real number in the interval [-2, 2] or [0, 4], and this interval is called ⁇ . Main (full) cycle.
  • X 0 can be calculated by applying WFRFT with order [- ⁇ , V] for S 0 (n), which is calculated as:
  • the following is a method for realizing the power allocation by using the WFRFT to unify the OFDMA system and the SC-FDE system, and the WFRFT conversion of the signal and the power extraction of the signal after the power distribution of the transmitting end, and then performing WFRFT on the signal.
  • the process of inverse transformation is described in detail.
  • Embodiment 1 is a schematic flowchart of a power distribution method according to Embodiment 1 of the present invention.
  • the embodiment of the present invention provides a power allocation method, which may be performed by any device that performs a power allocation method, and the device may be implemented by software and/or Or hardware implementation.
  • the device may be integrated in the transmitting side device or the receiving side device.
  • the method in this embodiment may include:
  • Step 101 Determine, according to a fading value of each subcarrier, a first power allocation value of each subcarrier in the SC-FDE system and a second power allocation value of each subcarrier in the OFDM system.
  • an existing channel estimation algorithm may be used to estimate the fading value of each center frequency point on each subcarrier, and according to each calculated central frequency.
  • the fading value of the point respectively calculates a first power allocation value of each subcarrier in the SC-FDE system and a second power allocation value of each subcarrier in the OFDM system.
  • Step 102 Determine a first weight value of the SC-FDE system and a second weight value of the OFDM system according to the preset parameter; the first weight value is used to indicate a proportion of the first power allocation value in the hybrid carrier system, and second The weight value is used to represent the proportion of the second power allocation value in the hybrid carrier system, which is a system composed of an SC-FDE system and an OFDM system.
  • the hybrid carrier system is a system obtained by transforming the SC-FDE system and the OFDM system according to the WFRFT transform.
  • the weighting coefficients w 0 , w 1 , w 2 and w 3 are calculated, and according to the formula (4) and the formula (5), the SC can be determined.
  • the first weight value represents the proportion of the first power allocation value in the hybrid carrier system
  • the second weight value represents the proportion of the second power allocation value in the hybrid carrier system
  • Step 103 Determine, according to the first power allocation value, the second power allocation value, and the first weight value and the second weight value, a third power allocation value of each subcarrier in the hybrid carrier system, and mix the carrier according to the third power allocation value.
  • the input signals on each subcarrier in the system are allocated power.
  • the first power allocation value of each subcarrier in the SC-FDE system and the second power allocation value of each subcarrier in the OFDM system are determined, and the first weight value of the SC-FDE system and the OFDM are calculated.
  • the third power allocation value of each subcarrier in the hybrid carrier system may be determined, and the input signal of each subcarrier is used for power allocation by using the third power allocation value, wherein the input signal may be Is an arbitrary complex sequence signal.
  • the power allocation method provided by the embodiment of the present invention determines the first power allocation value of each subcarrier in the single carrier frequency domain equalization SC-FDE system and the orthogonal frequency division multiplexing OFDM system according to the fading value of each subcarrier. a second power allocation value of each subcarrier, and determining a first weight value of the SC-FDE system and a second weight value of the OFDM system according to the preset parameter, according to the first power allocation value, the second power allocation value, and the first weight
  • the value and the second weight value determine a third power allocation value of each subcarrier in the hybrid carrier system, and perform power allocation on the input signal on each subcarrier in the hybrid carrier system according to the third power allocation value. Since the power allocation modes of the SC-FDE system and the OFDM system are comprehensively considered, the power distribution of the hybrid carrier system is performed, thereby improving the communication performance of the system.
  • FIG. 2 is a schematic flowchart diagram of Embodiment 2 of a power distribution method according to the present invention.
  • the method in this embodiment may include:
  • Step 201 according to the formula Determining a first power allocation value p sc,i of the i-th subcarrier in the SC-FDE system.
  • Step 202 according to the formula Determining a second power allocation value p ofdm,i of the ith subcarrier in the OFDM system.
  • the power on each subcarrier needs to be greater than zero.
  • the second power allocation value of the second subcarrier in the OFDM system is set to 0, in the SC-FDE system.
  • the first power allocation value of the second subcarrier is not calculated, and is directly set to 0, thereby ensuring the SC-FDE system and the OFDM system.
  • the carrier is the same.
  • Step 203 Determine a first weight value of the SC-FDE system and a second weight value of the OFDM system according to the preset parameter.
  • Step 203 is similar to step 102, and details are not described herein again.
  • Step 204 Perform linear weighting on the first power allocation value and the second power allocation value according to the first weight value and the second weight value to obtain a third power allocation value.
  • the first power allocation value of each subcarrier in the SC-FDE system and the second power allocation value of each subcarrier in the OFDM system are performed.
  • the third power allocation value p wfrft,i of the i-th sub-carrier in the hybrid carrier system can be calculated according to formula (6):
  • the transmitting-side device needs to send the third power allocation value to the receiving-side device, so that the two parties allocate according to the same third power.
  • the value is processed by the signal.
  • Step 205 Perform serial/parallel conversion of the input signal and weighted fractional Fourier transform WFRFT transform of - ⁇ +1 order to obtain a first frequency domain signal.
  • the input signal is converted into parallel processing, and the obtained conversion result of the M path is respectively subjected to WFRFT conversion of - ⁇ +1 order of N points to obtain a first frequency domain signal.
  • WFRFT transformation is as shown in formula (1).
  • the WFRFT domain of the ⁇ -order refers to the domain to which the input signal is transformed by the ⁇ -order WFRFT.
  • the fractional domain and the time domain and the frequency domain of the ⁇ -order are not isolated, and any signal exists in the time domain and the frequency domain.
  • Step 206 Perform power allocation on the first frequency domain signal according to the third power allocation value.
  • the transmitting device performs power on the first frequency domain signal D after performing WFRFT conversion of - ⁇ +1 order of N points according to the third power allocation value of each subcarrier in the determined hybrid carrier system. distribution.
  • Step 207 Perform N-point discrete Fourier transform (IDFT), parallel/serial conversion, and add cyclic prefix processing on the first frequency domain signal in sequence to obtain a processed signal.
  • IDFT N-point discrete Fourier transform
  • Parallel/serial conversion parallel/serial conversion
  • cyclic prefix processing on the first frequency domain signal in sequence to obtain a processed signal.
  • the first frequency domain signal D is transformed into a time domain by an inverse discrete Fourier transform (IDFT) of an N point.
  • IDFT inverse discrete Fourier transform
  • the signal S (s 1 , s 2 , . . . , s N ) T , and then perform parallel/serial conversion on the time domain signal S. After obtaining one converted signal, in order to suppress interference between symbols, it is necessary to obtain the obtained way.
  • the conversion signal adds a cyclic prefix.
  • Step 208 Perform digital/analog conversion on the processed signal to obtain a converted signal, and send the converted signal to the receiving side device.
  • the processed signal after adding the cyclic prefix is subjected to digital-to-analog conversion to obtain a converted signal, and the obtained converted signal is transmitted through a frequency selective fading channel for transmission to the receiving side device.
  • a power allocation method provided by an embodiment of the present invention where a transmitting side device passes each subcarrier according to each The fading value determines the first power allocation value of each subcarrier in the single carrier frequency domain equalization SC-FDE system and the second power allocation value of each subcarrier in the orthogonal frequency division multiplexing OFDM system, respectively, according to preset parameters Determining a first weight value of the SC-FDE system and a second weight value of the OFDM system, and determining, according to the first power allocation value, the second power allocation value, and the first weight value and the second weight value, each subcarrier in the hybrid carrier system And a third power allocation value, and performing power allocation on the input signals on each subcarrier in the hybrid carrier system according to the third power allocation value.
  • the power distribution of the hybrid carrier system is performed, thereby improving the communication performance of the system.
  • the third power value is calculated by linearly weighting the first power value and the second power value, thereby reducing the error rate of the system.
  • FIG. 3 is a schematic flowchart diagram of Embodiment 3 of a power distribution method according to the present invention.
  • the method in this embodiment may include:
  • Step 301 Establish an optimization equation targeting the maximum channel capacity according to the fading value of each subcarrier and the equalization algorithm of the channel.
  • Step 302 Obtain a maximum value of the channel capacity by using an optimization algorithm, and use a maximum value of the channel capacity as the first power allocation value.
  • Step 303 Establish an optimization equation targeting the maximum channel capacity according to the fading value of each subcarrier and the equalization algorithm of the channel.
  • Step 304 Obtain a maximum value of the channel capacity by using an optimization algorithm, and use a maximum value of the channel capacity as the second power allocation value.
  • the channel equalization algorithm may include a zero-forcing equalization algorithm, a minimum mean square error algorithm, etc., for different equalization algorithms, according to the fading value of the channel, to maximize The channel capacity is the optimization equation of the target.
  • the maximum value of the channel capacity can be obtained according to the optimization method, and the maximum value is the first power allocation value of each subcarrier in the SC-FDE system.
  • the optimization method may include a Lagrangian extreme value algorithm, a greedy algorithm, and the like.
  • the manner of determining the second power allocation value is similar to the manner of determining the first power allocation value, and details are not described herein again.
  • Step 305 Determine a first weight value of the SC-FDE system and a second weight value of the OFDM system according to the preset parameters.
  • Step 305 is similar to step 102, and details are not described herein again.
  • Step 306 Perform linear weighting on the first power allocation value and the second power allocation value according to the first weight value and the second weight value to obtain a third power allocation value.
  • the first power allocation value of each subcarrier in the SC-FDE system and the second power allocation value of each subcarrier in the OFDM system are performed.
  • the third power allocation value p wfrft,i of the i-th sub-carrier in the hybrid carrier system can be calculated according to formula (6):
  • the transmitting-side device needs to send the third power allocation value to the receiving-side device, so that the two parties allocate according to the same third power.
  • the value is processed by the signal.
  • steps 207 to 210 in the embodiment shown in FIG. 2 will be performed, and details are not described herein again.
  • the transmitting side device determines the first power allocation value of each subcarrier in the SC-FDE system and the second power allocation of each subcarrier in the OFDM system according to the fading value of each subcarrier. And determining a first weight value of the SC-FDE system and a second weight value of the OFDM system according to the preset parameter, and determining the hybrid according to the first power allocation value, the second power allocation value, and the first weight value and the second weight value a third power allocation value of each subcarrier in the carrier system, and performing power allocation on the input signals on each subcarrier in the hybrid carrier system according to the third power allocation value.
  • the power distribution of the hybrid carrier system is performed, thereby improving the communication performance of the system.
  • the third power value is calculated by linearly weighting the first power value and the second power value, thereby reducing the error rate of the system.
  • the sending side device may send indication information to the receiving side device, where the indication information is used to indicate whether to use the third power allocation value to perform power allocation on the input signals on each subcarrier in the hybrid carrier system.
  • the transmitting device may send, to the receiving device, at least one bit of indication information, where the indication information is used to indicate whether the third power allocation value is used on each subcarrier in the hybrid carrier system during the current signal transmission.
  • the input signal is used for power distribution. For example, if the indication information is 1, the transmitting device notifies the receiving device to perform power allocation on the input signals on each subcarrier in the hybrid carrier system by using the third power allocation value, and it is worth noting that when the third power allocation is confirmed For the value, it is necessary to further determine which known power allocation mode is adopted for each of the OFDM system and the SC-FDE system. If there are N possible power allocation modes, at least log 2 N bits are required in the indication information to represent the allocation mode. If the indication information is 0, the transmitting device notifies the receiving device not to use the third power allocation value to perform power allocation on the input signals on each subcarrier in the hybrid carrier system.
  • FIG. 4 is a schematic flowchart diagram of Embodiment 4 of a power distribution method according to the present invention.
  • the method in this embodiment may include:
  • Step 401 according to the formula Determining a first power allocation value p sc,i of the i-th subcarrier in the SC-FDE system.
  • Step 402 according to the formula Determining a second power allocation value p ofdm,i of the ith subcarrier in the OFDM system.
  • Step 403 Determine a first weight value of the SC-FDE system and a second weight value of the OFDM system according to the preset parameter.
  • Step 404 Perform linear weighting on the first power allocation value and the second power allocation value according to the first weight value and the second weight value to obtain a third power allocation value.
  • Steps 401 to 404 are similar to steps 201 to 204, and are not described herein again.
  • the receiving-side device needs to send the third power allocation value to the sending-side device, so that the two parties allocate according to the same third power.
  • the value is processed by the signal.
  • Step 405 sequentially perform analog/digital conversion, remove cyclic prefix, serial/parallel conversion, and N-point DFT transform on the processed signal to obtain a second frequency domain signal.
  • the receiving device after the transmitting device transmits the processing signal to the receiving device, the receiving device first performs analog/digital conversion on the processed signal to convert the analog signal into a digital signal, and then loops the digital signal.
  • Step 406 Perform frequency domain zero-forcing equalization ZF processing on the second frequency domain signal according to the equalization matrix to obtain an equalized signal.
  • ZF Zero-Forcing
  • the algorithm performs frequency domain linear equalization processing on the second frequency domain signal R to obtain an equalized signal.
  • Step 407 Perform power extraction on the equalized signal, and perform WFRFT processing of ⁇ -1 order on the equalized signal after the extracted power to obtain the input signal.
  • the transmitting device and the receiving device use a unified power allocation policy, after the receiving device obtains the equalization signal, the power allocation policy corresponding to the transmitting device is used to extract the allocation of the device on the transmitting device.
  • Power in the specific implementation process, can be extracted according to the following ways: among them, As an inverse matrix of P wfrft , it can be seen that power distribution of the signal in the frequency domain can reduce the influence of noise on signal transmission in the frequency domain.
  • the receiving side device determines the first power allocation value and orthogonal frequency division multiplexing of each subcarrier in the single carrier frequency domain equalized SC-FDE system according to the fading value of each subcarrier. a second power allocation value of each subcarrier in the OFDM system, and determining a first weight value of the SC-FDE system and a second weight value of the OFDM system according to the preset parameter, according to the first power allocation value, the second power allocation value, and The first weight value and the second weight value determine a third power allocation value of each subcarrier in the hybrid carrier system, and perform power allocation on the input signals on each subcarrier in the hybrid carrier system according to the third power allocation value.
  • the work is performed on the hybrid carrier system. Rate allocation, which improves the communication performance of the system.
  • the third power value is calculated by linearly weighting the first power value and the second power value, thereby reducing the error rate of the system.
  • FIG. 5 is a schematic flowchart diagram of Embodiment 5 of a power allocation method according to the present invention.
  • the method in this embodiment may include:
  • Step 501 Establish an optimization equation targeting the maximum channel capacity according to the fading value of each subcarrier and the equalization algorithm of the channel.
  • Step 502 Obtain a maximum value of the channel capacity by using an optimization algorithm, and use a maximum value of the channel capacity as the first power allocation value.
  • Step 503 Establish an optimization equation targeting the maximum channel capacity according to the fading value of each subcarrier and the equalization algorithm of the channel.
  • Step 504 Obtain a maximum value of the channel capacity by using an optimization algorithm, and use a maximum value of the channel capacity as the second power allocation value.
  • the channel equalization algorithm may include a zero-forcing equalization algorithm, a minimum mean square error algorithm, etc., for different equalization algorithms, according to the fading value of the channel, to maximize The channel capacity is the optimization equation of the target.
  • the maximum value of the channel capacity can be obtained according to the optimization method, and the maximum value is the first power allocation value of each subcarrier in the SC-FDE system.
  • the optimization method may include a Lagrangian extreme value algorithm, a greedy algorithm, and the like.
  • the manner of determining the second power allocation value is similar to the manner of determining the first power allocation value, and details are not described herein again.
  • Step 505 Determine a first weight value of the SC-FDE system and a second weight value of the OFDM system according to the preset parameters.
  • Step 506 Perform linear weighting on the first power allocation value and the second power allocation value according to the first weight value and the second weight value to obtain a third power allocation value.
  • Step 501 - Step 506 is similar to steps 301-306, and details are not described herein again.
  • steps 205 to 407 in the embodiment shown in FIG. 4 will be performed, and details are not described herein again.
  • the receiving side device determines the first power allocation value and OFDM of each subcarrier in the SC-FDE system according to the fading value of each subcarrier. a second power allocation value of each subcarrier in the system, and determining a first weight value of the SC-FDE system and a second weight value of the OFDM system according to the preset parameter, according to the first power allocation value, the second power allocation value, and the A weight value and a second weight value determine a third power allocation value of each subcarrier in the hybrid carrier system, and perform power allocation on the input signals on each subcarrier in the hybrid carrier system according to the third power allocation value.
  • the power distribution of the hybrid carrier system is performed, thereby improving the communication performance of the system.
  • the third power value is calculated by linearly weighting the first power value and the second power value, thereby reducing the error rate of the system.
  • FIG. 6 is a signaling diagram of Embodiment 6 of a power allocation method according to the present invention.
  • the technical solution of the present invention is described in detail by taking the third power allocation value as determined by the transmitting device.
  • the method in this embodiment may include:
  • Step 601 The transmitting device periodically weights the first power allocation value and the second power allocation value according to the first weight value and the second weight value to obtain a third power allocation value.
  • the transmitting device needs to first determine the first power allocation value and the second power allocation value, and the first weight value and the second weight value, and then linearize the determined first power allocation value and the second power allocation value. Weighting to obtain a third power allocation value.
  • Step 602 The transmitting device sends the third power allocation value to the receiving device.
  • Step 603 The transmitting side device performs serial/parallel conversion on the input signal, and performs WFRFT conversion of - ⁇ +1 order to obtain the first frequency domain signal.
  • the transmitting side device performs serial/parallel conversion on the input signal to obtain a conversion signal of the M channel, where M is a positive integer, and after obtaining the conversion signal of the M channel, performing WFRFT conversion of - ⁇ +1 order, The first frequency domain signal.
  • Step 604 The transmitting device performs power allocation on the first frequency domain signal according to the third power allocation value.
  • Step 605 The sending side device sends the first frequency domain signal to the receiving side device.
  • the transmitting side device needs to perform N-point IDFT transform on the first frequency domain signal to obtain an IDFT transformed signal, and then perform parallel/serial conversion on the IDFT transformed signal. Obtaining a conversion signal, adding a cyclic prefix to the one conversion signal, obtaining a processing signal, and finally performing digital/analog conversion on the processing signal to obtain a conversion signal, and transmitting the obtained conversion signal to the receiving side device.
  • Step 606 The receiving device extracts power of the converted signal to obtain an equalized signal after the extracted power.
  • the receiving side device sequentially performs analog/digital conversion, remove cyclic prefix operation, serial/parallel conversion, and N-point DFT transform on the converted signal to obtain a second frequency domain signal, which is obtained in the pair.
  • the second frequency domain signal performs frequency domain zero-forcing equalization ZF processing to obtain an equalized signal, and finally extracts power of the equalized signal to obtain an equalized signal after extracting power.
  • Step 607 The receiving side device performs WFRFT processing of ⁇ -1 order on the equalized signal after the extracted power, to obtain an input signal.
  • the power allocation method provided by the embodiment of the present invention determines the first power allocation value of each subcarrier in the single carrier frequency domain equalization SC-FDE system and the orthogonal frequency division multiplexing OFDM system according to the fading value of each subcarrier. a second power allocation value of each subcarrier, and determining a first weight value of the SC-FDE system and a second weight value of the OFDM system according to the preset parameter, according to the first power allocation value, the second power allocation value, and the first weight
  • the value and the second weight value determine a third power allocation value of each subcarrier in the hybrid carrier system, and perform power allocation on the input signal on each subcarrier in the hybrid carrier system according to the third power allocation value. Since the power allocation modes of the SC-FDE system and the OFDM system are comprehensively considered, the power distribution of the hybrid carrier system is performed, thereby improving the communication performance of the system.
  • step 401-step 403 can also be performed by the receiving device, and the execution process and principle are similar to the execution process and principle of the transmitting device, and details are not described herein again.
  • FIG. 7 is a schematic structural diagram of Embodiment 1 of a power distribution apparatus according to the present invention.
  • the power distribution apparatus provided by the embodiment of the present invention includes a determining module 11 and an allocating module 12.
  • the determining module 11 is configured to determine, according to the fading value of each subcarrier, a first power allocation value of each subcarrier in the single carrier frequency domain equalization SC-FDE system and a first subcarrier of the orthogonal frequency division multiplexing OFDM system.
  • the determining module 11 is further configured to determine a first weight value of the SC-FDE system and a second weight value of the OFDM system according to a preset parameter; the first weight value is used to indicate Deriving a proportion of a first power allocation value in the hybrid carrier system, where the second weight value is used to indicate a proportion of the second power allocation value in the hybrid carrier system, the hybrid carrier
  • the system is the SC-FDE system and the OFDM system a system comprising a system; the determining module 11 is further configured to determine each child in the hybrid carrier system according to the first power allocation value, the second power allocation value, and the first weight value and the second weight value a third power allocation value of the carrier; the allocating module 12 is configured to perform power allocation on the input signals on each subcarrier in the hybrid carrier system according to the third power allocation value.
  • the power distribution apparatus determines the first power allocation value of each subcarrier in the single carrier frequency domain equalization SC-FDE system and the orthogonal frequency division multiplexing OFDM system according to the fading value of each subcarrier. a second power allocation value of each subcarrier, and determining a first weight value of the SC-FDE system and a second weight value of the OFDM system according to the preset parameter, according to the first power allocation value, the second power allocation value, and the first weight The value and the second weight value determine a third power allocation value of each subcarrier in the hybrid carrier system, and perform power allocation on the input signal on each subcarrier in the hybrid carrier system according to the third power allocation value. Since the power allocation modes of the SC-FDE system and the OFDM system are comprehensively considered, the power distribution of the hybrid carrier system is performed, thereby improving the communication performance of the system.
  • the determining module 11 is configured to perform linear weighting on the first power allocation value and the second power allocation value according to the first weight value and the second weight value, to obtain the The third power allocation value.
  • the determining module 11 is specifically configured to establish, according to the fading value of each subcarrier and an equalization algorithm of the channel, an optimization equation that targets a maximum channel capacity;
  • the maximum value of the channel capacity is obtained by an optimization algorithm, and the maximum value of the channel capacity is used as the first power allocation value.
  • the determining module 11 is specifically configured according to a formula Determining a first power allocation value p sc,i of the i-th subcarrier in the SC-FDE system;
  • N represents the length of the discrete Fourier transform DFT
  • h i represents the fading value of the i-th frequency point on the channel.
  • the determining module 11 is specifically configured to:
  • the determining module 11 is specifically configured according to a formula
  • ⁇ represents the signal-to-noise ratio
  • E b represents the energy per bit signal
  • N 0 represents the noise power spectral density
  • FIG. 8 is a schematic structural diagram of a second embodiment of a power distribution apparatus according to the present invention. As shown in FIG. 8, the present embodiment is based on the embodiment shown in FIG.
  • the converting unit 121 is configured to perform serial/parallel conversion and - ⁇ +1 order weighted fractional Fourier transform WFRFT transform on the input signal to obtain a first frequency domain signal;
  • the allocating unit 122 is configured to perform power allocation on the first frequency domain signal according to the third power allocation value.
  • the power distribution device of this embodiment may be used to implement the technical solution of the power distribution method provided by any embodiment of the present invention, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • FIG. 9 is a schematic structural diagram of Embodiment 3 of a power distribution apparatus according to the present invention. As shown in FIG. 9, the present embodiment further includes: a processing module 13, a conversion module 14, and a sending module 15 on the basis of the foregoing embodiments. .
  • the processing module 13 is configured to sequentially perform an N-point discrete Fourier transform IDFT, a parallel/serial conversion, and a cyclic prefix process on the first frequency domain signal to obtain a processing signal.
  • the conversion module 14 is configured to perform digital/analog conversion on the processed signal to obtain a converted signal
  • the transmitting module 15 is configured to send the conversion signal to the receiving side device.
  • the sending module 15 is further configured to send indication information to the receiving side device, where the indication information is used to indicate whether to use the third power allocation value to perform power on an input signal on each subcarrier in the hybrid carrier system. distribution.
  • the power distribution device of this embodiment may be used to implement the technical solution of the power distribution method provided by any embodiment of the present invention, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • FIG. 10 is a schematic structural diagram of Embodiment 4 of a power distribution device according to the present invention, as shown in FIG.
  • the power distribution device provided by the embodiment of the present invention includes a determining module 21 and an allocating module 22.
  • the determining module 21 is configured to determine, according to the fading value of each subcarrier, a first power allocation value of each subcarrier in the single carrier frequency domain equalization SC-FDE system and a first subcarrier of the orthogonal frequency division multiplexing OFDM system.
  • the determining module 21 is further configured to determine a first weight value of the SC-FDE system and a second weight value of the OFDM system according to a preset parameter; the first weight value is used to indicate Calculating a proportion of the first power allocation value in the hybrid carrier system, where the second weight value is used to indicate a proportion of the second power allocation value in the hybrid carrier system; 21 is further configured to determine, according to the first power allocation value, the second power allocation value, and the first weight value and the second weight value, a third power allocation value of each subcarrier in the hybrid carrier system; The module 22 is configured to perform power allocation on the input signals on each subcarrier in the hybrid carrier system according to the third power allocation value.
  • the power distribution apparatus determines the first power allocation value of each subcarrier in the single carrier frequency domain equalization SC-FDE system and the orthogonal frequency division multiplexing OFDM system according to the fading value of each subcarrier. a second power allocation value of each subcarrier, and determining a first weight value of the SC-FDE system and a second weight value of the OFDM system according to the preset parameter, according to the first power allocation value, the second power allocation value, and the first weight The value and the second weight value determine a third power allocation value of each subcarrier in the hybrid carrier system, and perform power allocation on the input signal on each subcarrier in the hybrid carrier system according to the third power allocation value. Since the power allocation modes of the SC-FDE system and the OFDM system are comprehensively considered, the power distribution of the hybrid carrier system is performed, thereby improving the communication performance of the system.
  • the determining module 21 is configured to perform linear weighting on the first power allocation value and the second power allocation value according to the first weight value and the second weight value, to obtain the The third power allocation value.
  • the determining module 21 is specifically configured according to a formula Determining a first power allocation value p sc,i of the i-th subcarrier in the SC-FDE system;
  • N represents the length of the discrete Fourier transform DFT
  • h i represents the fading value of the i-th frequency point on the channel.
  • the determining module 21 is specifically configured according to a formula
  • E b represents the energy per bit signal
  • N 0 represents the noise power spectral density
  • FIG. 11 is a schematic structural diagram of Embodiment 5 of a power distribution apparatus according to the present invention. As shown in FIG. 11, this embodiment is based on the embodiment shown in FIG. 10, and the apparatus further includes: a conversion module 23, a processing module 24, and a sending Module 25.
  • the conversion module 23 is further configured to sequentially perform analog/digital conversion on the converted signal, remove the cyclic prefix, serial/parallel conversion, and N-point DFT transform to obtain a second frequency domain signal.
  • the processing module 24 is further configured to perform frequency domain zero-forcing equalization ZF processing on the second frequency domain signal according to the equalization matrix to obtain an equalized signal;
  • the processing module 24 is further configured to perform power extraction on the equalized signal, and perform WFRFT processing of ⁇ -1 order on the equalized signal after the extracted power to obtain the input signal.
  • the power distribution device of this embodiment may be used to implement the technical solution of the power distribution method provided by any embodiment of the present invention, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • FIG. 12 is a schematic structural diagram of Embodiment 1 of a transmitting device according to the present invention.
  • the transmitting side device 110 provided in this embodiment includes a processor 1101 and a memory 1102.
  • the transmitting side device may further include a transmitter 1103.
  • the transmitter 1103 is connected to the processor 1101.
  • the memory 1102 stores execution instructions.
  • the processor 1101 communicates with the memory 1102, and the processor 1101 calls an execution instruction in the memory 1102 to perform the following operations:
  • the first weight value is used to indicate that the first power allocation value is in the hybrid carrier system a proportion of the second weight value used to represent the proportion of the second power allocation value in the hybrid carrier system, the hybrid carrier system being the SC-FDE system and the OFDM system System of components;
  • the device on the transmitting side provided by this embodiment may be used to implement the technical solution of the power allocation method provided by any embodiment of the present invention.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • the processor 1101 is further configured to perform linear weighting on the first power allocation value and the second power allocation value according to the first weight value and the second weight value, to obtain the The third power allocation value.
  • the processor 1101 is further configured to establish, according to the fading value of each subcarrier and an equalization algorithm of the channel, an optimization equation that targets a maximum channel capacity;
  • the maximum value of the channel capacity is obtained by an optimization algorithm, and the maximum value of the channel capacity is used as the first power allocation value.
  • the processor 1101 is further configured to Determining a first power allocation value p sc,i of the i-th subcarrier in the SC-FDE system;
  • N represents the length of the discrete Fourier transform DFT
  • h i represents the fading value of the i-th frequency point on the channel.
  • the processor 1101 is further configured to establish, according to the fading value of each subcarrier and an equalization algorithm of the channel, an optimization equation that targets a maximum channel capacity;
  • the maximum value of the channel capacity is obtained by an optimization algorithm, and the maximum value of the channel capacity is used as the second power allocation value.
  • the processor 1101 is further configured to
  • ⁇ represents the signal-to-noise ratio
  • E b represents the energy per bit signal
  • N 0 represents the noise power spectral density
  • the processor 1101 is further configured to perform serial/parallel conversion and - ⁇ +1 order weighted fractional Fourier transform WFRFT transform on the input signal to obtain a first frequency domain signal;
  • the processor 1101 is further configured to sequentially perform an N-point discrete Fourier transform IDFT, a parallel/serial conversion, and a cyclic prefix process on the first frequency domain signal to obtain a processing signal.
  • the transmitter 1103 is further configured to send the conversion signal to a receiving side device.
  • the transmitter 1103 is further configured to send indication information to the receiving side device, where the indication information is used to indicate whether the third power allocation value is used to input signals on each subcarrier in the hybrid carrier system. Perform power distribution.
  • the device on the transmitting side provided by this embodiment may be used to implement the technical solution of the power allocation method provided by any embodiment of the present invention.
  • the implementation principle and technical effects are similar, and details are not described herein again.
  • FIG. 13 is a schematic structural diagram of Embodiment 1 of a receiving device according to the present invention.
  • the receiving side device 120 provided in this embodiment includes a processor 1201 and a memory 1202.
  • the receiving side device may further include a receiver 1203.
  • the receiver 1203 is connected to the processor 1201.
  • the receiver 1203 is configured to receive a conversion signal sent by the transmitting device, the memory 1202 stores an execution instruction, and when the receiving device operates, the processor 1201 communicates with the memory 1202, and the processor 1201 invokes the execution instruction in the memory 1202. Used to do the following:
  • the equalized signal is extracted by power, and the equalized signal after the extracted power is subjected to WFRFT processing of ⁇ -1 order to obtain the input signal.
  • the receiving side device provided by this embodiment may be used to implement the technical solution of the power allocation method provided by any embodiment of the present invention, and the implementation principle and technical effects thereof are similar, and details are not described herein again.
  • the sub-steps can be accomplished by hardware associated with the program instructions.
  • the aforementioned program can be stored in a computer readable storage medium.
  • the program when executed, performs the steps including the foregoing method embodiments; and the foregoing storage medium includes various media that can store program codes, such as a ROM, a RAM, a magnetic disk, or an optical disk.

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Abstract

L'invention concerne, dans des modes de réalisation, un procédé et un dispositif d'attribution de puissance, le procédé comprenant les étapes suivantes : la détermination d'une première valeur d'attribution de puissance de chaque sous-porteuse dans un système d'égalisation de domaine de fréquence à porteuse unique (SC-FDE) et d'une deuxième valeur d'attribution de puissance de chaque sous-porteuse dans un système de multiplexage par répartition orthogonale de la fréquence (OFDM) selon une valeur d'évanouissement de chacune des sous-porteuses ; la détermination d'une première valeur de pondération du système SC-FDE et d'une seconde valeur de pondération du système OFDM selon des paramètres prédéfinis ; et la détermination d'une troisième valeur d'attribution de puissance de chaque sous-porteuse dans un système de porteuse hybride selon la première valeur d'attribution de puissance, la deuxième valeur d'attribution de puissance, la première valeur de pondération et la seconde valeur de pondération et l'attribution de puissance pour des signaux d'entrée sur chacune des sous-porteuses dans le système de porteuse hybride selon la troisième valeur d'attribution de puissance. Le procédé et le dispositif d'attribution de puissance prévus dans les modes de réalisation de l'invention peuvent améliorer la performance de communication du système.
PCT/CN2016/088515 2015-07-06 2016-07-05 Procédé et dispositif d'attribution de puissance WO2017005161A1 (fr)

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