WO2014180128A1 - Procédé et dispositif d'accès pour réduire le facteur de crête maximum dans un système de multiplexage par répartition orthogonale de la fréquence - Google Patents

Procédé et dispositif d'accès pour réduire le facteur de crête maximum dans un système de multiplexage par répartition orthogonale de la fréquence Download PDF

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WO2014180128A1
WO2014180128A1 PCT/CN2013/088742 CN2013088742W WO2014180128A1 WO 2014180128 A1 WO2014180128 A1 WO 2014180128A1 CN 2013088742 W CN2013088742 W CN 2013088742W WO 2014180128 A1 WO2014180128 A1 WO 2014180128A1
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time domain
signal
domain signal
time
frequency domain
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PCT/CN2013/088742
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English (en)
Chinese (zh)
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王力
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华为技术有限公司
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L27/00—Modulated-carrier systems
    • H04L27/26—Systems using multi-frequency codes
    • H04L27/2601—Multicarrier modulation systems
    • H04L27/2614—Peak power aspects
    • H04L27/2618—Reduction thereof using auxiliary subcarriers

Definitions

  • the present application claims to be submitted to the Chinese Patent Office on May 09, 2013, the application number is 201310169155.3, and the invention name is "an orthogonal frequency division"
  • TECHNICAL FIELD The present invention relates to the field of wireless communication technologies, and in particular, to a method and an access device for reducing a peak-to-average ratio in an orthogonal frequency division multiplexing system.
  • Wireless Local Area Network technology has the advantages of high rate access and is widely used in the field of mobile network access.
  • OFDM Orthogonal Frequency Division Multiplexing
  • PAPR peak-to-average power ratio
  • PA power amplifier
  • one method of reducing PAPR is to use a method of remapping.
  • An exhaustive search is performed by any combination of bits corresponding to each symbol in the transmitted signal, in which a bit combination of the smallest PAPR is found. Therefore, in order to exhaust each bit combination, a large system power consumption is required, and only the best bit combination is searched for each symbol, and only the indication information of each symbol needs to be transmitted to enable the receiving end to correctly decode. This also increases the consumption of resources.
  • Another method for reducing the PAPR is to adjust the amplitude and angle of different pilot signals, and each pilot signal after adjustment is subjected to IFFT transformation to obtain a time domain signal set.
  • Each time domain signal in the time domain signal set is added to the time domain signal after the IFFT transform of the transmission signal, and the corresponding PAPR is obtained, and the peak value of the smallest PAPR is selected in the time domain signal set to be compared with the corresponding pilot signal. Data is sent.
  • the disadvantage of this scheme is that, due to the large number of pilot candidate combinations, it is necessary to traverse all the pilot signals in the set, and the calculation amount is large.
  • Embodiments of the present invention provide a method for reducing a peak-to-peak ratio in an orthogonal frequency division multiplexing system, so as to reduce a peak-to-average ratio of a modulated signal in an OFDM system with a lower power consumption and an amount of computation.
  • a first aspect of the embodiments of the present invention provides a method for reducing a peak-to-average ratio in an orthogonal frequency division multiplexing system, where the method includes:
  • Step 1 performing an inverse fast Fourier transform on the frequency domain symbol signal to be transmitted, and obtaining a first time domain signal sequence
  • Step 2 searching, in the first time domain signal sequence, a time domain signal exceeding a power threshold and a time domain position of the time domain signal;
  • Step 3 Send a frequency domain auxiliary signal in the first subcarrier, and adjust the frequency domain auxiliary signal, so that the frequency domain auxiliary signal time-frequency transformed second time domain signal is in the first time domain signal.
  • the time domain location power is the largest and the direction is opposite, and the first time domain signal is a time domain signal with the highest power in the time domain signal;
  • Step 4 adding the second time domain signal of the adjusted auxiliary signal to the first time domain signal sequence to reduce a peak-to-average ratio of the first time domain signal sequence.
  • the method further includes:
  • Step 5 detecting whether the peak-to-average ratio after the reduction meets the set threshold, and does not satisfy In the case of setting the threshold, another frequency domain auxiliary signal is used, and steps 3 to 5 are performed until the peak-to-average ratio satisfies the set threshold or no frequency domain auxiliary signal is available.
  • the frequency domain auxiliary signal is a pilot signal or a signal sent on an idle subcarrier for reducing a peak-to-average ratio.
  • the frequency domain auxiliary signal is adjusted, including the frequency Domain adjustment, wherein the frequency domain signal of the subcarrier of the frequency domain auxiliary signal is multiplied by exp (-j*2pi*K/Nc*T), where K is the subcarrier position, T is the time domain position of the first time domain signal in the time domain maximum power.
  • the frequency domain auxiliary signal is adjusted, including time domain adjustment, and the adjusting method is In order to convert the time domain signal corresponding to the inverse frequency inverse Fourier transform signal to the right in the time domain position T according to the first time domain signal in the order from left to right. T.
  • the time domain signal exceeding the power threshold is specifically the time domain signal with the highest power in the first time domain signal sequence.
  • the time domain signal exceeding the power threshold is specifically the time domain signal with the largest real part in the first time domain signal sequence.
  • the time domain signal exceeding the power threshold is specifically the imaginary part of the first time domain signal sequence The largest time domain signal.
  • an embodiment of the present invention provides an access device in a wireless local area network, where the access device includes:
  • a transform unit configured to perform fast Fourier transform on the frequency domain symbol signal to be transmitted, to obtain a first time domain signal sequence set
  • a searching unit configured to search for a time domain signal exceeding a power threshold and a time domain position of the time domain signal in the first time domain signal sequence
  • the frequency domain auxiliary signal is sent in the first subcarrier, and the frequency domain auxiliary signal is adjusted, so that the frequency domain auxiliary signal time-frequency transformed second time domain signal is in the first time domain signal
  • the time domain location power is the largest and the direction is opposite, and the first time domain signal is a time domain signal with the highest power in the time domain signal;
  • an operation unit configured to add the second time domain signal of the adjusted auxiliary signal to the first time domain signal sequence to reduce a peak-to-average ratio of the first time domain signal sequence.
  • the method further includes an execution unit, detecting whether the reduced peak-to-average ratio satisfies a set threshold, and controlling the processing unit if the set threshold is not met Repeatedly with the arithmetic unit, another frequency domain auxiliary signal is used until the peak-to-peak ratio satisfies the set threshold or no frequency domain auxiliary signal is available.
  • the frequency domain auxiliary signal is a pilot or a signal sent on an idle subcarrier for reducing a peak-to-average ratio.
  • the processing unit enters the frequency domain auxiliary signal
  • the line adjustment includes frequency domain adjustment, where the frequency domain signal of the subcarrier of the auxiliary signal is multiplied by exp ( -j*2pi*K/Nc*T ), where K is the subcarrier Position, the T is a position of the first time domain signal in the time domain maximum power.
  • the processing unit adjusts the frequency domain auxiliary signal, specifically, frequency domain adjustment
  • the adjusting method is that, according to the order from left to right, the time domain signal of the auxiliary signal after the inverse fast Fourier transform is performed according to the position T of the first time domain signal in the time domain maximum power. Shift T to the right.
  • the time domain signal exceeding the power threshold is specifically the time domain signal with the highest power in the first time domain signal sequence.
  • the time domain signal exceeding the power threshold is specifically the time domain signal with the largest real part in the first time domain signal sequence.
  • the time domain signal exceeding the power threshold is specifically the time domain signal with the largest imaginary part in the first time domain signal sequence.
  • Embodiments of the present invention provide a method for reducing a peak-to-average ratio in an orthogonal frequency division multiplexing system, by transmitting a reference signal as an auxiliary signal in an idle subcarrier with poor signal to noise ratio or in the case where channel estimation is not required.
  • a reference signal as an auxiliary signal
  • the inverse maximum value of the auxiliary signal and the maximum time domain of the modulated signal to be transmitted.
  • the signal superposition, the method of neutralizing the time domain power of the modulated signal reduces the peak-to-average ratio of the adjusted signal in the OFDM system, and can also reduce the computational complexity and improve the signal processing efficiency.
  • FIG. 1 is a flowchart of a method for reducing a peak-to-average ratio in an orthogonal frequency division multiplexing system according to an embodiment of the present invention
  • FIG. 2 is a structural diagram of an embodiment of an access device in a wireless local area network according to an embodiment of the present invention
  • FIG. 3 is a structural diagram of another embodiment of an access device in a wireless local area network according to an embodiment of the present invention.
  • an embodiment of the present invention provides a method for reducing a peak-to-average ratio in an orthogonal frequency division multiplexing system according to a first aspect of the present invention. It is an access point (AP) for a user equipment in a wireless local area network, or a handheld terminal that can access a wireless local area network in a wireless local area network, and the method includes the following steps: Step 1: For a frequency domain symbol to be transmitted Performing a fast Fourier transform on the signal to obtain a first time domain signal sequence;
  • the access point or the access terminal in the OFDM system it is required to perform modulation in the frequency domain, and then perform inverse fast Fourier transform (IFFT) after modulation to obtain a modulated signal.
  • IFFT inverse fast Fourier transform
  • the domain signal because the adjustment signals are respectively carried on different data subcarriers, the frequency domain signal sequence of the defect is transformed by the IFFT transform to obtain the time domain signal sequence of the points, and the time domain signal sequences form a OFDM symbol.
  • Step 2 searching, in the first time domain signal sequence, a time domain signal exceeding a power threshold and a time domain position of the time domain signal;
  • time domain signal sequence of the modulated signal after determining the time domain signal sequence of the modulated signal, selecting several time domain signals with high power and the positions of the time domain signals, several time domain signals whose power exceeds the set threshold may also be selected. And determining the time domain position and the complex value when the power takes the maximum value;
  • the power of the time domain signal can be determined by the square sum of the real part and the imaginary part of the complex value in the time domain, and the real part and the imaginary part of the time domain signal can be respectively compared, and the absolute value of the real part is the largest, or the imaginary part is selected.
  • the time domain signal with the largest absolute value can be determined by the square sum of the real part and the imaginary part of the complex value in the time domain, and the real part and the imaginary part of the time domain signal can be respectively compared, and the absolute value of the real part is the largest, or the imaginary part is selected.
  • Step 3 Send a frequency domain auxiliary signal in the first subcarrier, and adjust the frequency domain auxiliary signal, so that the frequency domain auxiliary signal time-frequency transformed second time domain signal is in the first time domain signal.
  • the time domain location power is the largest and the direction is opposite, and the first time domain signal is a time domain signal with the highest power in the time domain signal;
  • a separate frequency domain auxiliary signal may be sent in the idle subcarrier, or the pilot is used as a frequency domain auxiliary signal to reduce the peak-to-average ratio when channel estimation is not needed, but for these frequency domain auxiliary signals,
  • the phase is adjusted such that the position with the largest inverse amplitude after the frequency domain to the time domain change is the same as the position of the first time domain signal.
  • Step 4 adding the second time domain signal of the adjusted auxiliary signal to the first time domain signal sequence to reduce a peak-to-average ratio of the first time domain signal sequence.
  • the complex value of the time domain signal of the adjusted frequency domain auxiliary signal in the time domain is added to the complex value of the first time domain signal, and the time domain is the same, but the phase is opposite, thereby reducing the adjustment signal.
  • Amplitude since the peak-to-average ratio is proportional to the maximum power value of the modulated signal, the effect of reducing the peak-to-average ratio is achieved.
  • the peak-to-average ratio of the frequency domain auxiliary signal in one subcarrier and the time domain signal in the time domain signal in the frequency domain signal is not necessarily able to satisfy the set peak-to-average ratio gate P ⁇ . Value, so after the step 4, the system detects whether the peak-to-average ratio after the reduction meets the set threshold.
  • step 3 to step 4 by selecting another frequency domain auxiliary signal.
  • select the next time domain signal with the highest power, and adopt another The frequency domain auxiliary signal on the subcarrier performs the operation of decreasing the peak-to-average ratio; if the peak-to-average ratio still does not satisfy the set threshold after re-execution, step 3 to step 4 may be selected again until the time domain of the set threshold is not met.
  • the signal or no frequency domain auxiliary signal is available.
  • the reference signal is transmitted as an auxiliary signal in the idle subcarrier with poor signal to noise ratio or the pilot signal is used as the auxiliary signal without channel estimation, and the phase of the auxiliary signal is adjusted, and the auxiliary signal is used.
  • the inverse maximum value is superimposed with the maximum time domain signal in the modulated signal to be transmitted, and the method of neutralizing the time domain power of the modulated signal is used to reduce the peak-to-average ratio of the adjusted signal in the OFDM system, which can degrade the computational complexity and improve the signal processing efficiency.
  • the transmitting end can transmit the auxiliary signal in the subcarrier with poor signal to noise, and the effect of reducing the PAPR can be achieved.
  • the 802.11 ah system in the 2MHz bandwidth, there are 52 data subcarriers per OFDM symbol in the data domain. It is assumed that only 40 subcarriers with the best performance are selected for data transmission under the frequency selective channel, then 12 data are idle.
  • the subcarriers can be used to reduce the PAPR, assuming that the data to be transmitted is modulated with BPSK.
  • the domain position and the complex value and select a set of idle subcarriers, and adjust the phase of the symbol on the idle subcarrier according to the time domain position of the maximum value of the data subcarrier power, the positive and negative of the real imaginary part, and the position of the idle subcarrier, so that the idle subcarrier
  • the carrier takes the opposite sign at the position of the maximum value of the data subcarrier power, and then calculates the IFFT of the set of idle subcarriers, and recalculates whether the maximum value of the time domain signal after the data superimposed idle subcarrier satisfies the set peak-to-average ratio P ⁇ requirement If not, gradually increase the number of idle subcarriers until the preset PAPR threshold is met or the number of idle subcarriers is full.
  • the method of adjusting the phase of the idle subcarrier so that the reverse maximum value is the same as the position of the data domain signal with the largest power may be frequency domain adjustment, that is:
  • the free subcarrier position K and the data time domain maximum position are T
  • Nc is the total number of subcarriers
  • pi is the pi
  • exp ( ) is the exponential operator of the natural number e
  • the idle subcarrier frequency domain signal is multiplied by exp ( -j*2pi*K/Nc*T ), and select positive and negative signs according to the principle that the complex values of the data maximum are added to the minimum.
  • the time domain first, calculate the IFFT time domain signal of a set of idle subcarriers, and then, according to the data time domain maximum position T, perform a rightward shift of the IFFT of the group according to the order from left to right. Bit T.
  • the positive and negative signs are selected according to the principle that the complex value of the maximum value of the data is added to the minimum.
  • the same idle subcarriers may be selected to perform peak neutralization on the data subcarriers with larger powers until the peak-to-average ratio satisfies the set requirement, or is not satisfied. Set the data subcarrier of the power condition.
  • the channel time-varying period is long, and thus the channel time change is slow, so the pilot in the data domain does not need to perform channel estimation, so the pilot used for channel estimation can be compared with the above embodiment.
  • the pilot in the data domain does not need to perform channel estimation, so the pilot used for channel estimation can be compared with the above embodiment.
  • the idle subcarriers in the middle as a lower peak-to-average ratio
  • the frequency domain auxiliary signal the process is similar to the previous embodiment, and will not be described again.
  • the reference signal is transmitted as an auxiliary signal in the idle subcarrier with poor signal to noise ratio or the pilot signal is used as the auxiliary signal without channel estimation, and the phase of the auxiliary signal is adjusted, and the auxiliary signal is used.
  • the inverse maximum value is superimposed with the maximum time domain signal in the modulated signal to be transmitted, and the method of neutralizing the time domain power of the modulated signal is reduced.
  • Adjusting the peak-to-average ratio of the signal in the OFDM system can reduce the computational complexity and improve the signal processing efficiency.
  • an embodiment of the present invention provides an access device in a wireless local area network, where the device may be a handheld terminal or an access point (AP) in a WLAN system.
  • the device includes:
  • a transform unit 201 configured to perform an inverse fast Fourier transform on the frequency domain symbol signal that needs to be transmitted, to obtain a first time domain signal sequence
  • the searching unit 202 is configured to search, in the first time domain signal sequence, a time domain signal that exceeds a power threshold and a time domain location of the time domain signal;
  • the processing unit 203 is configured to send a frequency domain auxiliary signal in the first subcarrier, and adjust the frequency domain auxiliary signal, so that the frequency domain auxiliary signal time-frequency transformed second time domain signal is in the first time domain signal.
  • the time domain location power is the largest and the direction is opposite, and the first time domain signal is a time domain signal with the highest power in the time domain signal;
  • the operation unit 204 is configured to add the second time domain signal of the adjusted auxiliary signal to the first time domain signal sequence to reduce a peak-to-average ratio of the first time domain signal sequence.
  • the frequency domain auxiliary signal is a pilot signal or a reference signal transmitted on an idle subcarrier for reducing a peak-to-average ratio.
  • the apparatus further includes an executing unit, configured to detect whether the peak-to-average ratio of the reduced operation unit 204 meets a set threshold, and is not satisfied In the case where the threshold is set, the processing unit 203 and the arithmetic unit 204 are repeatedly executed until there is no available subcarrier or a time domain signal that does not exceed the power threshold.
  • the processing unit 203 adjusts the auxiliary signal, specifically frequency domain adjustment, by multiplying the frequency domain signal of the subcarrier of the auxiliary signal by exp (-j*). 2 pi * K / Nc * T ), where K is the subcarrier position, and the T is a position of the first time domain signal in the time domain maximum power.
  • An embodiment of the present invention provides an access device in a wireless local area network, which uses a reference signal as an auxiliary signal in an idle subcarrier with poor signal to noise ratio or a pilot signal as an auxiliary signal if channel estimation is not required. And adjusting the phase of the auxiliary signal, superimposing the inverse maximum value of the auxiliary signal with the maximum time domain signal of the modulated signal to be transmitted, neutralizing the time domain power of the modulated signal, and reducing the peak-to-average ratio of the adjusted signal in the OFDM system, You can downgrade the computational complexity and improve signal processing efficiency.
  • an embodiment of the present invention further provides an access device for a wireless local area network, where the device 30 can be an access point or a handheld terminal, and the like, and the device 30 can include the device.
  • the system bus 34 is used to connect the network interface 31, the processor 32, and the memory 33.
  • the network interface 31 is for communicating with an external device.
  • the memory 33 may be a permanent memory such as a hard disk drive and a flash memory, in the memory 33 Has software modules and device drivers.
  • the software modules are capable of performing the various functional modules of the above described method of the present invention; the device drivers can be network and interface drivers.
  • Step 1 Perform fast inverse Fourier transform on the modulated frequency domain symbol signal that needs to be transmitted, to obtain a first time domain signal sequence set;
  • Step 2 searching, in the first time domain signal sequence, a time domain signal exceeding a power threshold and a time domain position of the time domain signal;
  • Step 3 Send a frequency domain auxiliary signal in the first subcarrier, and adjust the frequency domain auxiliary signal, so that the frequency domain auxiliary signal time-frequency transformed second time domain signal is in the first time domain signal.
  • the time domain location power is the largest and the direction is opposite, and the first time domain signal is a time domain signal with the highest power in the time domain signal;
  • Step 4 adding the second time domain signal of the adjusted auxiliary signal to the first time domain signal sequence to reduce a peak-to-average ratio of the first time domain signal sequence.
  • Embodiments of the present invention provide a device for reducing a peak-to-average ratio in an orthogonal frequency division multiplexing system, by transmitting a reference signal as an auxiliary signal in an idle subcarrier with poor signal to noise ratio or in the case where channel estimation is not required.
  • a reference signal as an auxiliary signal
  • adjusting the phase of the auxiliary signal superimposing the inverse maximum value of the auxiliary signal with the maximum time domain signal of the modulated signal to be transmitted, and neutralizing the time domain power of the modulated signal, reducing the OFDM system
  • the computational complexity can be degraded and the signal processing efficiency can be improved.
  • 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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  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
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Abstract

L'invention concerne un procédé adapté pour réduire le facteur de crête maximum dans un système OFDM. Le procédé comprend les étapes suivantes : étape 1, par une transformée de Fourier inverse rapide, transformer un signal de modulation devant être transmis, et acquérir une première série de signaux dans le domaine temporel ; étape 2, dans la première série de signaux dans le domaine temporel, rechercher une pluralité de signaux de puissance dans le domaine temporel qui satisfont un seuil et des positions dans le domaine temporel des signaux dans le domaine temporel quand la puissance est à son maximum ; étape 3, transmettre un signal auxiliaire dans le domaine fréquentiel, dans une sous-porteuse déterminée, et ajuster inversement des seconds signaux dans le domaine temporel du signal auxiliaire aux positions dans le domaine temporel de premiers signaux dans le domaine temporel quand la puissance est à son maximum, les premiers signaux dans le domaine temporel étant les signaux dans le domaine temporel de la puissance maximale parmi la pluralité de signaux dans le domaine temporel ; et, étape 4, ajouter les seconds signaux dans le domaine temporel ajustés du signal auxiliaire, à la pluralité de premiers signaux dans le domaine temporel afin de réduire le facteur de crête maximum du signal de modulation. Le procédé permet d'exécuter une réduction du facteur de crête maximum du signal de modulation dans le système OFDM, ainsi qu'une réduction de la consommation de puissance et de la quantité de calculs.
PCT/CN2013/088742 2013-05-09 2013-12-06 Procédé et dispositif d'accès pour réduire le facteur de crête maximum dans un système de multiplexage par répartition orthogonale de la fréquence WO2014180128A1 (fr)

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US10187239B2 (en) * 2015-11-05 2019-01-22 Huawei Technologies Co., Ltd. Systems and methods to reduce the peak-to-average power ratio (PAPR) of signals in channel bonding
CN108282435B (zh) * 2017-01-06 2022-06-17 中兴通讯股份有限公司 一种信号传输方法及装置
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