WO2012174947A1 - Procédé de commande de gain et unité radio distante - Google Patents

Procédé de commande de gain et unité radio distante Download PDF

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Publication number
WO2012174947A1
WO2012174947A1 PCT/CN2012/074900 CN2012074900W WO2012174947A1 WO 2012174947 A1 WO2012174947 A1 WO 2012174947A1 CN 2012074900 W CN2012074900 W CN 2012074900W WO 2012174947 A1 WO2012174947 A1 WO 2012174947A1
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WO
WIPO (PCT)
Prior art keywords
gain
att
vga
power threshold
power
Prior art date
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Ceased
Application number
PCT/CN2012/074900
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English (en)
Chinese (zh)
Inventor
黄国明
杜菊
陈军政
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ZTE Corp
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ZTE Corp
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Publication date
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Publication of WO2012174947A1 publication Critical patent/WO2012174947A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03G—CONTROL OF AMPLIFICATION
    • H03G3/00—Gain control in amplifiers or frequency changers
    • H03G3/20—Automatic control
    • H03G3/30—Automatic control in amplifiers having semiconductor devices
    • H03G3/3052—Automatic control in amplifiers having semiconductor devices in bandpass amplifiers (H.F. or I.F.) or in frequency-changers used in a (super)heterodyne receiver
    • H03G3/3073—Circuits generating control signals when no carrier is present, or in SSB, CW or pulse receivers

Definitions

  • the present invention relates to mobile communication technologies, and in particular, to a gain control method and a radio remote unit. Background technique
  • the Global System for Mobile Communications (GSM) base station is mainly composed of a baseband unit (BBU) and a radio remote unit (RRU).
  • BBU baseband unit
  • RRU radio remote unit
  • the main work of the RRU is to receive the signal from the user equipment, and after processing, send the signal to the BBU for demodulation.
  • the signal power received by the RRU from the antenna port is generally small.
  • the RRU filters the signal, low noise amplification, and radio frequency mixing in the uplink processing.
  • the digital signal is processed after the analog-to-digital conversion.
  • the signal-to-noise ratio of the signal in the link processing is inherently deteriorating, and the low-noise amplifier may also cause signal saturation distortion.
  • the gain of the IF gain block (VGA) and the RF gain block (ATT) in the uplink is usually adjusted by an appropriate method.
  • the signal can work in a more ideal state to meet the receiver's uplink specification requirements, that is, to meet the sensitivity specified by the protocol; to meet the protocol's requirements for multiple out-of-band interference; when the reverse link is flooded with an abnormally large signal, the protection RF link requirements.
  • time division multiple access systems is a strategy called fast control to improve the uplink signal. Its core idea is: The instantaneous power of the analog-to-digital converter (ADC) is sampled. When the signal is abnormal, the intermediate frequency and the RF gain are adjusted immediately to prevent signal overflow and protect the RF link. .
  • ADC analog-to-digital converter
  • the embodiment of the invention provides a gain control method and a radio remote unit to solve the problem that the signal to noise ratio is reduced due to the inaccuracy of the existing fast control strategy.
  • Embodiments of the present invention provide a gain control method applied to a global mobile communication system including an automatic gain control module, an analog-to-digital converter (ADC), an intermediate frequency gain module (VGA), and an RF gain module (ATT).
  • ADC analog-to-digital converter
  • VGA intermediate frequency gain module
  • ATT RF gain module
  • the method includes:
  • the automatic gain control module is configured to perform the first time period of a current time slot of a current frame
  • the instantaneous power of the ADC signal is detected, and according to the detection result, it is determined whether the gain of the VGA and/or the ATT is attenuated, and if the attenuation is performed, the attenuated gain is allocated to the module that needs to be attenuated;
  • the automatic gain control module detects an average power of the ADC signal in a second time period of a current time slot of a current frame, and gains the VGA and/or the ATT according to the detection result and a preset power threshold. The adjustment is made and the adjusted gain is configured to the module requiring adjustment in the corresponding time slot of the next frame. Attenuation, including:
  • the automatic gain control module when the instantaneous power of the detected signal exceeds the first power threshold reaches a preset threshold, respectively, gains the gain of the VGA by a first step and the gain of the ATT by a second step Attenuating is performed; when the number of times does not reach the preset threshold, the VGA and the ATT are not attenuated.
  • the preset power threshold includes a second power threshold
  • the automatic gain control module adjusts the gain of the VGA and/or the ATT according to the detection result and the preset power threshold, including:
  • the automatic gain control module sequentially steps the gain of the ATT by a third step and the gain of the VGA by a fourth step. Attenuating alternately or simultaneously; wherein the third step and the fourth step are both smaller than the first step and the second step.
  • the preset power threshold includes a third power threshold
  • the automatic gain control module After the automatic gain control module performs attenuation, the automatic gain control module first performs the gain of the ATT when the average power of the detected signal is less than the third power threshold according to the detection node.
  • the callback is used to call back the gain of the VGA after the gain of the ATT is adjusted back to the gain threshold.
  • the preset power threshold further includes a third power threshold
  • the automatic gain control module After the automatic gain control module performs attenuation, the automatic gain control module first performs the gain of the ATT when the average power of the detected signal is less than the third power threshold according to the detection node.
  • the callback is used to call back the gain of the VGA after the gain of the ATT is adjusted back to the gain threshold; wherein the second power threshold is greater than the third power threshold.
  • the second power threshold is smaller than the first power threshold.
  • the invention also provides a radio remote unit (RRU) comprising an automatic gain control module, an analog to digital converter (ADC), an intermediate frequency gain module (VGA) and an RF gain module (ATT), wherein:
  • RRU radio remote unit
  • ADC analog to digital converter
  • VGA intermediate frequency gain module
  • ATT RF gain module
  • the automatic gain control module is configured to: detect an instantaneous power of the ADC signal in a first time period of a current time slot of a current frame, and determine whether to gain the VGA and/or the ATT according to the detection result. Performing attenuation, if attenuation is performed, configuring the attenuated gain to the module requiring attenuation; detecting the average power of the ADC signal in the second time period of the current time slot of the current frame, according to the detection result and the preset The power threshold adjusts the gain of the VGA and/or the ATT, and configures the adjusted gain to the module that needs to be adjusted in the corresponding time slot of the next frame.
  • the automatic gain control module is further configured to: when the instantaneous power of the detected signal exceeds the first power threshold reaches a preset threshold, respectively, the gain of the VGA is in a first step and The gain of the ATT is attenuated in a second step; the preset gate is not reached at the number of times For a limited time, the VGA and the ATT are not attenuated.
  • the preset power threshold includes a second power threshold
  • the automatic gain control module is further configured to: when the average power of the detected signal exceeds the second power threshold, sequentially step the gain of the ATT by a third step and the gain of the VGA by a fourth step Attenuating alternately or simultaneously; wherein the third step and the fourth step are both smaller than the first step and the second step.
  • the preset power threshold includes a third power threshold
  • the automatic gain control module is further configured to: when the average power of the detected signal is less than the third power threshold, first perform a callback on the gain of the ATT, and wait for the gain of the ATT to be adjusted back to the gain threshold The gain of the VGA is called back.
  • the preset power threshold further includes a third power threshold
  • the automatic gain control module is further configured to: when the average power of the detected signal is less than the third power threshold, first perform a callback on the gain of the ATT, and wait for the gain of the ATT to be adjusted back to the gain threshold The gain of the VGA is called back; wherein the second power threshold is greater than the third power threshold.
  • the second power threshold is smaller than the first power threshold.
  • the above gain control method and the radio remote unit use a control method combining time slot and instantaneous power detection and average power detection to effectively improve the signal to noise ratio of the uplink signal.
  • FIG. 1 is a schematic diagram of a control time period of each time slot according to an embodiment of the present invention
  • FIG. 2 is a schematic structural diagram of a RRU link according to an embodiment of the present invention.
  • FIG. 3 is a flow chart of an embodiment of a gain control method of the present invention.
  • Embodiments of the present invention are directed to a GSM system that uses a combination of time-slotted and instantaneous power sampling and average power sampling to ensure the signal-to-noise ratio of the uplink signal, and the combination of instantaneous power sampling and average power sampling.
  • the method is also called a combination of fast control and slow control.
  • Embodiments of the present invention provide a gain control method applied to a global mobile communication system including an automatic gain control module, an analog-to-digital converter (ADC), an intermediate frequency gain module (VGA), and an RF gain module (ATT).
  • ADC analog-to-digital converter
  • VGA intermediate frequency gain module
  • ATT RF gain module
  • the method includes:
  • the automatic gain control module detects the instantaneous power of the ADC signal in a first time period of the current time slot of the current frame, and determines whether to attenuate the gain of the VGA and/or the ATT according to the detection result, If attenuation is performed, the attenuated gain is configured to the module requiring attenuation;
  • the automatic gain control module detects an average power of the ADC signal in a second time period of a current time slot of a current frame, and gains the VGA and/or the ATT according to the detection result and a preset power threshold. The adjustment is made and the adjusted gain is configured to the module requiring adjustment in the corresponding time slot of the next frame.
  • FIG. 1 it is a schematic diagram of a control time period of each time slot of the present invention, and each time slot includes two time periods T1 and T2, and the embodiment of the present invention applies a gain control for each time slot of GSM.
  • the method is: fast control in the T1 time period, slow control in the T2 time period, whether it is fast control or slow control, the adjusted result is buffered to the status register in the automatic gain control module, as the next adjustment Benchmark.
  • the time period of T1 in Fig. 1 is very short.
  • the power may have relatively large fluctuations, and a fast control is performed, mainly by performing a general estimation of the current slot signal power by the peak data at the beginning of the sampling slot, thereby setting a damping value for the current slot.
  • the general tone is performed, mainly by performing a general estimation of the current slot signal power by the peak data at the beginning of the sampling slot, thereby setting a damping value for the current slot.
  • the general tone The general tone.
  • the power is relatively stable and the time is relatively long, which is the T2 time period in Figure 1.
  • the average power of the time slot is detected, and the gain control value of the time slot of the next frame is calculated according to the average power, and the speed control is actually for the next time slot.
  • a strategy for row control If it is detected that the attenuation in T1 is too large, the power will be adjusted back to ensure the signal-to-noise ratio of the signal.
  • the quality of the uplink signal is very important to the receiver.
  • the gain of the signal is adjusted back by the slow control, and the signal is well guaranteed.
  • the noise ratio and the performance of the uplink are guaranteed to make up for the shortcomings of the existing strategy.
  • the position of the automatic gain control module in the RRU link is as shown in FIG. Its main function is to ensure the quality of the uplink signal by detecting the power of the input signal of the analog-to-digital converter (ADC) and adjusting the VGA and ATT according to the threshold parameters, so that the signal passing through the RF link satisfies the receiver's uplink indicator.
  • ADC analog-to-digital converter
  • the above gain control method uses a combination of fast control and slow control to ensure the signal-to-noise ratio of the uplink signal, where:
  • the steps for quick control include:
  • the automatic gain control module first detects the peak value of the signal during the T1 time period, that is, modulates the signal after the ADC sample, and determines that the single point modulus is greater than the first power. Threshold, that is, a peak is detected;
  • the slow control uses the mean detection and starts at the beginning of the corresponding time slot of the next frame. Slow control is divided into three steps:
  • step 2) Perform ATT/VGA parameter adjustment in the current time slot; Compared to fast control, only ATT and / or VGA are attenuated. Slow control needs to include two processes of attenuation and callback. Because, in step 2) of the fast control, if the peak exceeding the threshold number is not detected during the T1 period, the attenuation will not be performed, so the slow control needs to include the attenuation-processshot
  • the slow control when the detected average power is greater than the expected power range (ie, greater than the second power threshold), the slow control attenuates the ATT and the VGA in small steps respectively; when the detected average power is less than the desired power range (ie, when it is less than the third power threshold), the Manchester speed control performs a callback on the ATT and the VGA, wherein the second power threshold is greater than the third power threshold.
  • the slow control attenuation can use the ATT and VGA alternate attenuation or simultaneous attenuation.
  • the process of alternating attenuation is as follows:
  • the attenuation amplitude of ATT and VGA there are corresponding requirements for the attenuation amplitude of ATT and VGA.
  • the configuration parameters of ATT or VGA can only be attenuated to the maximum amplitude at most. Once one of the parameters reaches the maximum attenuation amplitude, only the other one is adjusted. Parameter; When both parameters reach the maximum attenuation amplitude, the ATT/VGA is no longer attenuated regardless of whether the received average power is still greater than the high threshold.
  • the slow control callback uses the ATT priority callback. Assuming that the average power detected by the current time slot is less than the third power threshold, the ATT is first called back, and after the ATT is adjusted back to the maximum gain, the VGA is called back.
  • step of attenuation in the slow control attenuation process is smaller than the step of attenuation in the fast process, and the small step attenuation in the slow control attenuation process and the large step attenuation in the fast control attenuation process are performed again.
  • the purpose of the gain callback is the same, both to improve the signal-to-noise ratio.
  • the threshold of the fast control is higher than the threshold of the slow control, that is, the first power threshold is greater than the second power threshold, because the fast control has another function, that is, the link is protected, when connected When the power of the receiving link suddenly becomes large, the fast control will be quickly turned on, and the link gain is attenuated by a large step, thereby protecting the link.
  • Step 301 An automatic gain control module performs statistics on an instantaneous power of an ADC signal exceeding a first power threshold;
  • Step 302 performing an overflow judgment, that is, determining whether the number exceeds a preset threshold, and if so, executing step 303, otherwise, proceeding to step 306;
  • Step 303 Whether the maximum attenuation amplitude is reached, if not, executing step 304; if yes, keeping ATT and / or VGA unchanged; ending;
  • Step 304 attenuating ATT and / or VGA
  • Step 305 hardware delay
  • the purpose of the hardware delay here is to adjust the decay time, because it takes a certain time to adjust the ATT or VGA;
  • Step 306 the automatic gain control module detects the average power of the ADC signal; Step 307, performing an overflow judgment, that is, determining whether the average power exceeds the second power threshold, and if so, executing step 308, otherwise, performing step 313;
  • Step 308 Whether the maximum attenuation amplitude is reached, if yes, go to step 309; otherwise, perform the step
  • Step 309 keeping ATT and / or VGA unchanged; ending;
  • Step 310 The control word is saved; the result of the adjusted ATT or VGA is saved to the corresponding status register as a reference for the next adjustment;
  • the adjustment in the step is attenuation, and if it is from step 314 to the step, the adjustment in the step is a callback;
  • Step 311 Wait for the start time of the next time slot to adjust ATT/VGA;
  • Step 312 hardware delay; end;
  • Step 313 the callback judgment, that is, determining whether the average power is less than the third power threshold, and if yes, executing step 314, otherwise, ending; Step 314, whether the minimum attenuation amplitude is reached, if yes, go to step 309, otherwise, go to step 310.
  • the above gain control method uses a method of combining time slots and combining instantaneous power detection and average power detection to improve the signal to noise ratio of the uplink signal.
  • the embodiment of the invention further provides a radio remote unit (RRU), which comprises an automatic gain control module, an analog-to-digital converter (ADC), an intermediate frequency gain module (VGA) and an RF gain module (ATT), wherein:
  • RRU radio remote unit
  • ADC analog-to-digital converter
  • VGA intermediate frequency gain module
  • ATT RF gain module
  • the automatic gain control module is configured to detect an instantaneous power of the ADC signal in a first time period of a current time slot of a current frame, and determine whether to gain the VGA and/or the ATT according to the detection result. Performing attenuation, if attenuation is performed, configuring the attenuated gain to the module requiring attenuation; detecting the average power of the ADC signal in the second time period of the current time slot of the current frame, according to the detection result and the preset The power threshold adjusts the gain of the VGA and/or the ATT, and configures the adjusted gain to the module that needs to be adjusted in the corresponding time slot of the next frame.
  • the automatic gain control module determines whether to attenuate the gain of the VGA and/or the ATT according to the detection result, and is used to: preset the number of times the instantaneous power of the detected signal exceeds the first power threshold reaches a preset a threshold, wherein the gain of the VGA is respectively attenuated by a first step and a gain of the ATT in a second step; when the number of times does not reach the preset threshold, the VGA and the ATT does not decay.
  • the automatic gain control module is configured to first call back the gain of the ATT when the average power of the detected signal is less than the third power threshold, and wait for the ATT The gain of the VGA is recalled after the gain is adjusted back to the gain threshold.
  • the automatic gain control module is configured to: when the average power of the detected signal exceeds the second power threshold, sequentially obtain the gain of the ATT in a third step And attenuating the gain of the VGA in a fourth step alternately or simultaneously; wherein the third step and the fourth step are both smaller than the first step and the second step.
  • the automatic gain control module is further configured to: when the average power of the detected signal is less than the third power threshold, first perform a callback on the gain of the ATT, and wait for a gain callback of the ATT Retrieving the gain of the VGA after reaching a gain threshold; wherein the second power threshold is greater than the third power threshold. Further, in order to protect the link, the second power threshold is smaller than the first power threshold.
  • the above RRU uses a method of combining time slots and combining instantaneous power detection and average power detection to improve the signal to noise ratio of the uplink signal.
  • the above gain control method and the radio remote unit use a control method combining time slot and instantaneous power detection and average power detection to effectively improve the signal to noise ratio of the uplink signal.

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  • Mobile Radio Communication Systems (AREA)
  • Control Of Amplification And Gain Control (AREA)

Abstract

L'invention porte sur un procédé de commande de gain. Le procédé comprend les opérations suivantes : un module de commande automatique de gain détecte la puissance instantanée d'un signal de convertisseur analogique-numérique (ADC) dans une première période de temps d'un créneau temporel courant d'une trame courante, détermine d'effectuer ou non une atténuation sur le gain d'un module de gain de fréquence intermédiaire (VGA) et/ou d'un module de gain radiofréquence (ATT) conformément au résultat de détection, et si l'atténuation doit être effectuée, configure le gain atténué sur le module qui nécessite une atténuation ; et le module de commande automatique de gain détecte la puissance moyenne du signal ADC dans une seconde période de temps du créneau temporel courant de la trame courante, et ajuste le gain du VGA et/ou de l'ATT conformément au résultat de détection et à un seuil de puissance préréglé, et configure le gain ajusté sur le module qui requiert un ajustement dans le créneau temporel correspondant d'une trame suivante. Le procédé de commande de gain et l'unité radio distante selon la présente invention améliorent efficacement le rapport signal sur bruit d'un signal de liaison montante.
PCT/CN2012/074900 2011-06-22 2012-04-28 Procédé de commande de gain et unité radio distante Ceased WO2012174947A1 (fr)

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CN201110169362.XA CN102231906B (zh) 2011-06-22 2011-06-22 一种增益控制方法及射频拉远单元
CN201110169362.X 2011-06-22

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