WO2011088680A1 - Procédé et dispositif destinés à déterminer la métrique cubique et la réduction maximale de puissance - Google Patents

Procédé et dispositif destinés à déterminer la métrique cubique et la réduction maximale de puissance Download PDF

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Publication number
WO2011088680A1
WO2011088680A1 PCT/CN2010/076613 CN2010076613W WO2011088680A1 WO 2011088680 A1 WO2011088680 A1 WO 2011088680A1 CN 2010076613 W CN2010076613 W CN 2010076613W WO 2011088680 A1 WO2011088680 A1 WO 2011088680A1
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WIPO (PCT)
Prior art keywords
cubic metric
value
metric value
initial
cubic
Prior art date
Application number
PCT/CN2010/076613
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English (en)
Chinese (zh)
Inventor
郭阳
禹忠
Original Assignee
中兴通讯股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Application filed by 中兴通讯股份有限公司 filed Critical 中兴通讯股份有限公司
Publication of WO2011088680A1 publication Critical patent/WO2011088680A1/fr

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Classifications

    • 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

Definitions

  • the present invention relates to the field of radio frequency testing technologies for wireless communication products, and in particular, to a method and apparatus for determining a cubic metric and a maximum backoff power suitable for an LTE (Long Term Evolution) system.
  • LTE Long Term Evolution
  • PAPR Peak to Average Power Ratio
  • CM Cubic Metric
  • the power backoff method is to compress the output power of the power amplifier from the ldB compression point (the amplifier has a linear dynamic range. In this range, the output power of the amplifier increases linearly with the input power. As the input power continues to increase, the amplifier gradually enters. In the saturation region, the power gain begins to decrease. Usually, the output power value when the gain is reduced to ldB lower than the linear gain is defined as the ldB compression point of the output power, expressed by PldB.) Backward 6-10 decibels, working far away Below the level of the ldB compression point, the power amplifier is moved away from the saturation region into the linear operating region, thereby improving the third-order intermodulation coefficient of the power amplifier. In general, when the fundamental power is reduced by ldB, the third-order intermodulation distortion is improved by 2 dB.
  • the power backoff is to take the output power of the power amplifier from the reference point (the reference point should be the maximum transmit power, because each family does not strictly use the ldB compression point as the maximum transmit power.)
  • Backward retreat Decibels. The amount of backlash is closely related to the size of the CM value.
  • the power back-off method is simple and easy to implement, and does not require any additional equipment. It is an effective way to improve the linearity of the amplifier. However, when the power falls back to a certain extent, when the third-order intermodulation is reached Continuing the retraction below -50dBc will no longer improve the linearity of the amplifier, so it is necessary to determine the appropriate back-off power.
  • MPR Maximum Power Reduction
  • the size of the MPR depends on the value of the CM, and how the MPR is obtained by the CM is not yet determined in the prior art.
  • the present invention provides a method and apparatus for determining a cubic measure and a maximum back-off power.
  • the present invention provides a method for determining a cubic metric, comprising: obtaining an initial cubic metric value according to the following equation, and outputting the initial cubic metric value as a cubic metric:
  • CM denotes the initial cubic metric value
  • K is a constant
  • x' denotes the conjugate transpose of the vector
  • O is the input signal of the power amplifier, ref dB - vref ',
  • K can be 1.56; for wideband code division multiple access systems, K can be 1.85.
  • the method of the present invention may further comprise:
  • the initial cubic metric value is added to the bandwidth compensation factor to obtain the corrected cubic metric value, and the corrected cubic metric value is output as the cubic metric, that is: CA ⁇ CM + C where the corrected cubic metric value is the bandwidth Compensation factor.
  • the present invention also provides a method for determining a maximum back-off power, comprising: determining a maximum back-off power as a cubic metric and a constant A when the difference between the cubic metric and a constant A is not less than 0 after determining the cubic metric according to the method of the present invention.
  • the difference when the difference between the cubic metric and the constant A is less than 0, determines that the maximum back-off power is 0, where A is a constant and 0 ⁇ A ⁇ 5.
  • A can be 1 or 1.2.
  • the present invention also provides a cubic metric determining apparatus, the apparatus comprising an initial calculating unit configured to obtain an initial cubic metric value by outputting the initial cubic metric value as a cubic metric:
  • ⁇ rms(v(t)) ⁇ ' denotes the conjugate transpose of vector x
  • N denotes the length of vector X
  • N l
  • II denotes the absolute value
  • ) is the input signal to the power amplifier
  • re 20log w ⁇ rm S (vref orm (t)) ⁇ ,
  • K can be 1.56; for wideband code division multiple access systems, K can be 1.85.
  • the apparatus of the present invention may further include: a correction unit connected to the initial calculation unit and configured to add the initial cubic metric value and the bandwidth compensation factor to obtain a corrected cubic metric value, and the obtained corrected cubic metric value is used as a cube
  • the measurement output namely: G ⁇ GM + C ⁇ where CM is the corrected cubic metric value and is the bandwidth compensation factor.
  • the apparatus may further include: a rounding unit, the rounding unit is connected to the initial calculating unit and/or the correcting unit, and is configured to perform the following processing on the initial cubic metric value CM or the corrected cubic metric value to obtain a rounded cubic metric value CM, , will take the cube value CM.
  • CM flnal CEIL ⁇ CM , G ⁇ CEIL ⁇ CM
  • CM is the integer cubic metric value
  • G is the unit of the upward carry
  • CEIL operation is G The operation of the unit up value.
  • the apparatus of the present invention may further include: a rounding unit, the rounding unit is connected to the initial calculating unit, and is configured to perform the following processing on the initial cubic metric value to obtain a rounding metric value CM ⁇ , which will take the whole cubic metric value CM ⁇
  • CM flna i CEIL ⁇ CM, GY, where CM is the integer cubic metric value, G is the unit of the upward carry, and CEIL operation is the upward value of G.
  • the present invention also provides a maximum back-off power determining device, where the device includes a cubic metric determining module and a maximum back-off power determining module, where
  • the cubic metric determination module is configured to determine a cubic metric according to the method of the present invention.
  • the maximum back-off power determining module is connected to the cubic metric determining module, and is configured to determine a maximum back-off power by: subtracting a cubic metric from a constant A to obtain a difference, when the difference is not less than 0
  • the maximum back-off power is determined as the difference between the cubic metric and the constant A.
  • the maximum back-off power is determined to be 0, where 0 ⁇ A ⁇ 5.
  • A can be 1 or 1.2.
  • the present invention provides a method and apparatus for determining a cubic metric and determining a maximum back-off power based on a cubic metric, capable of determining a maximum back-off power and improving power amplifier efficiency.
  • FIG. 1 is a flowchart of a method for calculating an MPR according to an embodiment of the present invention
  • FIG. 2 is a block diagram of a cubic metric determining apparatus according to an embodiment of the present invention.
  • FIG. 3 is a block diagram of a maximum back-off power determining apparatus according to an embodiment of the present invention.
  • the present invention provides a method for determining a cubic measure, and is specifically referred to the first method to the fourth method of the embodiment.
  • method one Calculate the initial cubic metric value according to the following formula, and use the initial cubic metric value as the cubic metric:
  • x' denotes the conjugate transpose of vector x
  • N denotes the length of vector x
  • N l in this method
  • II denotes absolute value
  • 0 is the input signal of power amplifier
  • m ⁇ (t) denotes reference signal of power amplifier ;
  • the preferred values given by the present invention are: For LTE systems, the preferred value for ⁇ is 1.56; for W-CDMA systems, the preferred value for ⁇ is 1.85.
  • the initial cubic metric value can be corrected by modifying the CM for the different bandwidths that are applied to obtain the corrected cubic metric value and outputting the corrected cubic metric value as a cubic metric:
  • the preferred value is 0, the preferred value for the 3.84 MHz bandwidth is 0; the preferred value for the 4.51 MHz bandwidth is 0.77; other values are also within the scope of the present invention.
  • G is the unit of the upward carry.
  • the preferred value of G is 0.5; 0.1; 0.2; 0.3; 0.4.
  • the CEIL operation takes the value up in G.
  • CM is [0, 0.3, 0.6, 0.9, 1.2, 1.5, 1.8, ..., xia], where CM is the maximum value that CM can take, and the value of CM is to be determined.
  • CM 1.0.
  • CM 1.2.
  • method 4 can be obtained. As shown in the following formula, the corrected cubic metric value is rounded to obtain a rounded cubic metric value, and the rounded cubic metric value is used as a cubic metric value.
  • the parameters in each expression have the same meaning, and the preferred values are the same, and can be applied to each other.
  • the present invention also provides a method for determining MPR. After determining CM according to method one, two, three or four, when the difference between CM and a constant A is not less than 0, the maximum back-off power is the difference between CM and constant A. When the difference between CM and constant A is less than 0, the maximum back-off power is 0, where A is a constant and 0 ⁇ A ⁇ 5.
  • MPR MAX(CM-A, 0), that is, when CM-A is not less than 0, CM-A is output as the maximum back-off power, and when CM-A is less than 0, output 0 is the maximum back-off. power.
  • A is a constant, 0 ⁇ A ⁇ 5, and a preferred value of A is 1 or 1.2.
  • Step 110 first calculating the initial cubic metric, as follows
  • Step 120 correcting the initial cubic metric, and obtaining Step 130, rounding CM 2 to obtain
  • the present invention also provides a cubic metric determining device, as shown in FIG. 2, comprising an initial calculating unit, a correcting unit and a rounding unit, wherein:
  • the initial calculation unit is configured to obtain an initial cubic metric value according to the following formula, and output the initial cubic metric value as a cubic metric:
  • K is 1.56; for wideband code division multiple access systems, K is 1.85.
  • the correction unit is connected to the initial calculation unit, and is configured to add the initial cubic metric value and the bandwidth compensation factor to obtain a corrected cubic metric value, and output the corrected cubic metric value as a cubic metric:
  • CM new CM + C dB ;
  • CM is the corrected cubic metric value and is the bandwidth compensation factor.
  • the rounding unit is connected to the initial calculating unit and/or the correcting unit, and is configured to perform the following processing on the initial cubic metric value CM or the modified cubic metric value 1 to obtain a rounded cubic metric value CM ⁇ Describe the whole cubic metric value CM as the cubic metric output:
  • CM flnal CEIL ⁇ CM, G] or CEIL ⁇ CM new , G];
  • CM ⁇ is the value of the whole cubic metric
  • G is the unit of the upward carry
  • CEIL operation takes the value of G upward.
  • the cubic metric determining means may include only the initial calculating unit, or only the initial calculating unit and the correcting unit; or only the initial calculating unit and the rounding unit.
  • the present invention further provides a maximum back-off power determining device, as shown in FIG. 3, including a cubic metric determining module and a maximum back-off power determining module, where
  • the cubic metric determination module is configured to determine a metric according to the method described in the method embodiment of the present invention.
  • the maximum back-off power determination module is connected to the cubic metric determination module, and is configured to: subtract the cubic metric from a constant A to obtain a difference, and when the difference is not less than 0, determine the maximum back-off power as a cubic metric and a constant The difference between A, when the difference is less than 0, it is determined that the maximum back-off power is 0, wherein 0 ⁇ A ⁇ 5.
  • the A is 1 or 1.2.
  • the present invention can determine the maximum back-off power and improve the efficiency of the power amplifier.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Amplifiers (AREA)

Abstract

La présente invention concerne un procédé de détermination d'une métrique cubique. Le procédé comprend les étapes suivantes : obtenir la valeur d'une métrique cubique initiale à l'aide de l'équation suivante : (I), et délivrer en sortie la métrique cubique initiale comme métrique cubique, où CM représente la métrique cubique initiale, K est une constante, avec K > 0, (II), (III), x' représente la transposition conjuguée du vecteur, la longueur de étant N = 1, v(t) est le signal d'entrée de l'amplificateur de puissance, (IV), (V), où vref(t) représente le signal de référence de l'amplificateur de puissance. La présente invention concerne également un procédé de détermination de la réduction maximale de puissance.
PCT/CN2010/076613 2010-01-21 2010-09-03 Procédé et dispositif destinés à déterminer la métrique cubique et la réduction maximale de puissance WO2011088680A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN201010001081.9 2010-01-21
CN2010100010819A CN102136856A (zh) 2010-01-21 2010-01-21 一种确定立方量度和最大回退功率的方法和装置

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CN106971366B (zh) * 2017-02-08 2020-09-11 北京印刷学院 一种在音频信号中加入及提取水印的方法

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WO2008130693A2 (fr) * 2007-04-20 2008-10-30 Interdigital Technology Corporation Dispositif et procédé pour calculer une réduction de puissance maximum d'un signal umts
CN101515809A (zh) * 2009-03-17 2009-08-26 中兴通讯股份有限公司 载波聚合场景中降低参考信号cm的方法和装置
WO2009153138A1 (fr) * 2008-06-19 2009-12-23 Icera Inc Estimation de caractéristiques de signal

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CN101227735B (zh) * 2008-01-30 2012-11-28 中兴通讯股份有限公司 随机接入信道的zc序列排序方法和装置
JP5169256B2 (ja) * 2008-01-30 2013-03-27 富士通株式会社 Ｍｉｍｏ通信システムおよび送信局

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WO2008130693A2 (fr) * 2007-04-20 2008-10-30 Interdigital Technology Corporation Dispositif et procédé pour calculer une réduction de puissance maximum d'un signal umts
WO2009153138A1 (fr) * 2008-06-19 2009-12-23 Icera Inc Estimation de caractéristiques de signal
CN101515809A (zh) * 2009-03-17 2009-08-26 中兴通讯股份有限公司 载波聚合场景中降低参考信号cm的方法和装置

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