CN102064770B - Remote radio unit and method for regulating drain voltage thereof - Google Patents
Remote radio unit and method for regulating drain voltage thereof Download PDFInfo
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- CN102064770B CN102064770B CN 201010530842 CN201010530842A CN102064770B CN 102064770 B CN102064770 B CN 102064770B CN 201010530842 CN201010530842 CN 201010530842 CN 201010530842 A CN201010530842 A CN 201010530842A CN 102064770 B CN102064770 B CN 102064770B
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Abstract
The invention provides a Remote Radio Unit (RRU) and a method for regulating drain voltage of the RRU, wherein the RRU comprises a feedback path, a calculation judgment unit, a power supply module and a power amplifier, wherein the feedback path is used for acquiring an output signal of the power amplifier and transmitting the output signal to the calculation judgment unit; the calculation judgment unit is used for calculating an Adjacent Channel Power Ratio (ACPR) of the output signal and raising the voltage of the power supply module according to a set stepping configuration if judging that the ACPR is larger than a target value and the absolute value of the difference between the ACPR and the target value is larger than a preset value, wherein if judging that the absolute value of the difference between the ACPR and the target value is smaller than or equal to the preset value, the voltage of the power supply module is not regulated; the power supply module is used for supplying power to the power amplifier according to the voltage configured by the calculation judgment unit; and the power amplifier is used for signal amplification and signal output based on the power supply of the power supply module. According to the proposal of the invention, energy consumption can be lowered.
Description
Technical field
The present invention relates to mobile communication technology, the method that relates in particular to Remote Radio Unit (RRU, Radio Remote Unit) and the RRU drain voltage is adjusted.
Background technology
In order to satisfy the demand of energy-saving and emission-reduction and environmental protection, the efficient of optimizing the RRU power amplification is one of main factor of considering.It is main power save mode that RRU can adjust its drain voltage according to load condition, RRU receives radio network controller (RNC, Radio Network Controller) information of Fa Songing, power amplifier by self carries out power amplification, filter by self carries out filtering then, afterwards information is exported to terminal.When power amplifier was output as maximum power, its efficient (PAE, Power Amplifier Efficiency) maximum had only 30～40%; If power output reduces, then the PAE value is lower.Therefore, the mode that adopts electric power source pair of module power amplifier drain voltage to adjust with the just bias state of holding power amplifier, reduces the electric energy that power amplifier consumes, to reach energy saving purposes.
Referring to Fig. 1, be the structural representation of RRU in the prior art, it comprises field programmable gate array (FPGA, Field-Programmable Gate Array), control and signal processor, power module and power amplifier;
After the information that control and signal processor send RNC is carried out respective handling by FPGA, digital to analog converter (DAC, Digital to Analog Converter), quadrature modulator, transmitter unit etc., send power amplifier to; And control and signal processor also according to the characteristic of the information that is sent by radio network controller (RNC, Radio Network Controller), are adjusted the voltage of power module, and described characteristic comprises type of message, size of message etc.;
Power module is used for carrying out the voltage adjustment under the control of control and signal processor, with the voltage after adjusting the drain electrode of power amplifier is powered;
Power amplifier carries out the amplification output of signal according to the power supply of power module.
In specific implementation, the structure of FPGA can comprise digital up converter, crest factor attenuator and digital predistorter, and at this moment, control and signal processor are also controlled the crest factor attenuator.
RRU can also comprise feedback network, is used for the output signal of received power amplifier, carries out sending FPGA to after the respective handling, and the digital predistorter among the FPGA carries out Distortion Analysis to output signal to be handled.Simultaneously, power module is also powered to feedback circuit.Can specifically comprise analog to digital converter (ADC, Analog to Digital Converter), amplifilter, low-converter and controllable attenuator etc. in the feedback circuit.
Further, this RRU can also comprise filter, is used for the output signal of power amplifier is carried out sending to terminal after filtering is handled.
Referring to Fig. 2, be the method flow diagram of in the prior art RRU drain voltage being adjusted, this method arranges Electrically Erasable Read Only Memory (EEPROM in advance in RRU, Electrically Erasable Programmable Read Only Memory), corresponding relation between EEPROM preservation peak power output and supply voltage, this corresponding relation example is as shown in table 1:
| Power dBm | Supply voltage (V) |
| 43≤Pout | 29～30.5 |
| 40≤Pout | 28 |
| 38≤Pout | 26 |
| 36≤Pout | 24 |
| 34≤Pout | 22 |
| Pout＜32 | 20 |
Corresponding relation between table 1 peak power output and the supply voltage
The method of Fig. 2 may further comprise the steps:
RRU sends to terminal after the information that is sent by RNC is carried out respective handling, and described characteristic comprises type of message, size of message etc.This peak power output of determining is for antenna that need be by RRU sends to the peak power output of terminal, the just peak power output of RRU intermediate power amplifier with message.
The definite of peak power output can periodically carry out.
The magnitude of voltage of power module particularly, is the magnitude of voltage of the DAC in the power module.
Vc can calculate by following formula: Vc=(Vout-20)/10.5 * 1024.
Afterwards, after amplifying signal carried out filtering and handle through filter, send to terminal.
Existing scheme is according to the characteristic of the information that is sent by RNC that receives, periodically the RRU drain voltage is adjusted, find in the practice, the feature of the information that sends by RNC is adjusted the RRU drain voltage, there is bigger error, and the characteristic of the information that RNC sends not is to adjust unique factor of RRU drain voltage, and this causes and can not accurately adjust the RRU drain voltage, can not further reduce energy loss.
Summary of the invention
The invention provides a kind of RRU, this RRU can further reduce energy loss.
The present invention also provides the method that the RRU drain voltage is adjusted, and this method can further reduce energy loss.
A kind of RRU, this RRU comprise feedback network, calculate judging unit, power module and power amplifier;
Described feedback network, the output signal that is used for gathering power amplifier sends described calculating judging unit to;
Described calculating judging unit, be used for calculating the neighboring trace leakage power of described output signal than (ACPR, Adjacent Channel Leakage Power Ratio), judge described ACPR greater than the absolute value of the difference of desired value and described ACPR and desired value greater than preset value, then according to setting the voltage that the stepping configuration increases described power module; Be less than or equal to preset value if judge the absolute value of the difference of described ACPR and desired value, then the voltage of power module do not adjusted;
Described power module is used for according to the voltage of described calculating judging unit configuration described power amplifier being powered;
Described power amplifier is used for carrying out according to the power supply of power module the amplification output of signal.
A kind of RRU is drained put a method of compressing into the row adjustment, and this method comprises:
Feedback network is gathered the output signal of power amplifier;
Calculate the ACPR that judging unit calculates described output signal;
Calculate judgment unit judges go out described ACPR greater than the absolute value of the difference of desired value and described ACPR and desired value greater than preset value, then according to setting the voltage that the stepping configuration increases power module, return the step that described feedback network is gathered the output signal of power amplifier; Be less than or equal to preset value if judge the absolute value of the difference of described ACPR and desired value, then the voltage of power module do not adjusted;
The voltage of power amplifier after according to the power module adjustment carries out the amplification output of signal.
From such scheme as can be seen, among the present invention, RRU adjusts the drain voltage of power amplifier in real time according to the output signal of power amplifier, so that the ACPR of output signal is near desired value, the energy loss that shows output signal near desired value is less, thereby, reached the technique effect of further reduction energy loss.And the present invention program need not to increase extra EEPROM storage peak power output and the corresponding relation between the supply voltage, just can realize the RRU drain voltage is adjusted based on the RRU self structure, thereby reduce cost.
Description of drawings
Fig. 1 is the schematic diagram of RRU structure in the prior art;
The method flow diagram of Fig. 2 in the prior art RRU drain voltage being adjusted;
Fig. 3 is the structural representation of RRU of the present invention;
The method indicative flowchart that Fig. 4 adjusts the RRU drain voltage for the present invention;
The method flow diagram example that Fig. 5 adjusts the RRU drain voltage for the present invention.
Embodiment
For making the purpose, technical solutions and advantages of the present invention clearer, below in conjunction with embodiment and accompanying drawing, the present invention is described in more detail.
ACPR is that the main channel signal of weighing the RRU output signal causes the index of disturbing and setting to contiguous frequency signal, also is an important indicator weighing RRU output signal nonlinear distortion degree.The RRU output signal is after just being amplified by power amplifier, by the signal of filter output.ACPR can measure by the output signal to power amplifier.
The ACPR of output signal has reacted the efficient that power amplifier carries out power amplification, if the main channel signal is little to the interference that contiguous frequency signal causes, RRU output signal nonlinear distortion is little, efficient height then, if the main channel signal is big to the interference that contiguous frequency signal causes, RRU output signal nonlinear distortion is big, and then efficient is low; Efficient has embodied energy loss, if the efficient height, then energy loss is little, if efficient is low, then energy loss is big.Just, just can know RRU energy loss situation by ACPR; When the ACPR that records near desired value, then the state of output signal is preferable, this moment power amplifier be in the just bias state, the energy loss under this state is less.
Among the present invention, RRU adjusts the drain voltage of power amplifier in real time according to the output signal of power amplifier, forms a closed loop adjustment, makes the ACPR value of output signal near desired value, thereby reaches the effect of further reduction energy loss.
Below by Fig. 3 RRU structure provided by the invention is described, the present invention program can realize by existing RRU structure, FPGA and control and signal processor is collectively referred to as the calculating judging unit here.The structure of Fig. 3 comprises feedback network, calculates judging unit, power module and power amplifier;
Described feedback network, the output signal that is used for gathering power amplifier sends described calculating judging unit to;
Described calculating judging unit is used for calculating the ACPR of described output signal, judge described ACPR greater than the absolute value of the difference of desired value and described ACPR and desired value greater than preset value, then according to the voltage of setting the described power module of stepping configuration increase; Be less than or equal to preset value if judge the absolute value of the difference of described ACPR and desired value, then the voltage of power module do not adjusted;
Described power module is used for according to the voltage of described calculating judging unit configuration described power amplifier being powered;
Described power amplifier is used for carrying out according to the power supply of power module the amplification output of signal.
Alternatively, described calculating judging unit comprises FPGA and control and signal processor;
Described FPGA is used for calculating the ACPR of described output signal, judge described ACPR greater than the absolute value of the difference of desired value and described ACPR and desired value greater than preset value, then send to adjust to described control and signal processor and instruct;
Described control and signal processor are used for after receiving the adjustment instruction, according to setting the voltage that the stepping configuration increases described power module.
Alternatively, described calculating judging unit comprises FPGA and control and signal processor;
Described FPGA is used for receiving the output signal that described feedback circuit transmits, and sends described control and signal processor to;
Described control and signal processor are used for calculating the ACPR of described output signal, judge described ACPR greater than the absolute value of the difference of desired value and described ACPR and desired value greater than preset value, then according to the voltage of setting the described power module of stepping configuration increase.
Alternatively, described calculating judging unit be further used for judge ACPR less than the absolute value of the difference of desired value and described ACPR and desired value greater than preset value, then according to setting the value that the stepping configuration reduces described power module.
Ground same as the prior art, FPGA can specifically comprise digital up converter, crest factor attenuator and digital predistorter, at this moment, control and signal processor are also controlled the crest factor attenuator.Feedback path also is used for the output signal of received power amplifier, carries out sending FPGA to after the respective handling, and the digital predistorter among the FPGA carries out Distortion Analysis to output signal to be handled.Simultaneously, power module is also powered to feedback circuit.Can specifically comprise ADC, amplifilter, low-converter and controllable attenuator in the feedback circuit.And, after the information that control and signal processor send RNC is carried out respective handling by FPGA, DAC, quadrature modulator, transmitter unit etc., send power amplifier to.
Further, this RRU can also comprise filter, is used for the output signal of power amplifier is carried out sending to terminal after filtering is handled.
Referring to Fig. 4, be the method indicative flowchart that the present invention adjusts the RRU drain voltage, this method is carried out based on the structure of Fig. 3, and it may further comprise the steps:
Step 401, feedback network is gathered the output signal of power amplifier.
Step 402 is calculated the ACPR that judging unit calculates the output signal of step 401 collection.
ACPR can calculate by FPGA or control and signal processor, particularly, for example can be calculated by the digital predistorter among the FPGA.
ACPR can adopt existing mode to calculate, computational methods comprise: the output signal of gathering is carried out Fourier transform, calculate available signal power P1 and P2 in the output signal, calculate neighboring trace signal power P3 and P4 in the output signal, calculate two ACPR values by formula ACPR_H=20log10 (P3/P1) and ACPR_L=20log10 (P4/P2).Carry out simple declaration below by two examples.
Insert (TD-SCDMA to calculate Time Division-Synchronous Code Division Multiple Access, Time Division-Synchronous Code Division Multiple Access) ACPR of system is that example is specifically described, and carries out Fourier transform by 8192 points of feedback network collection; Available signal power is calculated in configuration according to carrier wave, specifically comprise: the power to 1.28Mhz in the useful signal medium-high frequency point bandwidth of output signal carries out addition, obtain P1, the power of 1.28Mhz in the useful signal medium and low frequency point bandwidth of output signal is carried out addition, obtain P2; Calculate adjacent-channel power again, specifically comprise: the power to 1.28Mhz in the neighboring trace bandwidth of the useful signal medium-high frequency point of output signal carries out addition, obtain P3, the power of 1.28Mhz in the neighboring trace bandwidth of the useful signal medium and low frequency point of output signal is carried out addition, obtain P4; Calculate two ACPR values by formula ACPR_H=20log10 (P3/P1) and ACPR_L=20log10 (P4/P2) at last.
Describe with the ACPR that calculates Long Term Evolution (LTE, Long Term Evolution) system again, carry out Fourier transform by 8192 of feedback circuit collections; At first calculate the available signal power of output signal, signal power in each 9MHz bandwidth of center frequency point both sides is superposeed as available signal power P1, for LTE, each carrier wave stack, has only a carrier wave point, cause P1=P2, calculate adjacent-channel power again, the left side neighboring trace obtains P4 with the power addition in the bandwidth, the interior power addition of 9MHz bandwidth that the right side neighboring trace departs from main signal obtains P3, obtains two ACPR values by formula ACPR_H=20log10 (P3/P1) and formula ACPR_L=20log10 (P4/P2)=20log10 (P4/P1) at last.
About the prior art that is calculated as of ACPR, exceed here and give unnecessary details.
Step 403, calculate judgment unit judges go out described ACPR greater than the absolute value of the difference of desired value and described ACPR and desired value greater than preset value, then according to the voltage of setting stepping configuration increase power module, return step 401, and execution in step 404; Be less than or equal to preset value if judge the absolute value of the difference of described ACPR and desired value, then the voltage of power module do not adjusted.
If setting stepping is X, this step is described to be comprised according to the voltage of setting stepping configuration increase power module: with current voltage and the X addition of power module, upgrade the current voltage of power module with addition result.
Because the ACPR value that calculates is two, correspondingly, judges described ACPR in this step and greater than desired value be: judge that any one thinks then that greater than desired value ACPR is greater than desired value among the ACPR_H that calculates and the ACPR_L; The absolute value of judging the difference of ACPR and desired value described in this step greater than preset value is: judge among the ACPR_H that calculates and the ACPR_L absolute value of difference of any one and desired value greater than preset value, think that then the absolute value of difference of ACPR and desired value is greater than preset value.Need to prove that two ACPR that calculate are very approaching, in the actual conditions, one of them ACPR generally can not occur greater than desired value, and another ACPR is less than the situation of desired value.
Usually, can desired value be set to-40dB.The present invention also provides a kind of and uses the scheme of different target value according to different temperatures, is specially: be made as under the normal temperature-45dB, be made as-43dB under high temperature and the low temperature.
Described preset value can arrange as required, for example can be set to 3dB or 2dB.
In order to reduce energy loss, the present invention is primarily aimed at ACPR and adjusts greater than the situation of preset value greater than the absolute value of the difference of desired value and described ACPR and desired value.In the step 403, when judging ACPR less than the absolute value of the difference of desired value and described ACPR and desired value during greater than preset value, can process ends.Further, in order to improve the efficient of power amplifier output signal, during greater than preset value, also can adjust the voltage of power module less than the absolute value of the difference of desired value and described ACPR and desired value when judging ACPR, be specially:
If judge ACPR less than the absolute value of the difference of desired value and described ACPR and desired value greater than preset value, then according to setting the voltage that the stepping configuration reduces power module, return step 401.If setting stepping is X, describedly comprise according to setting the voltage that the stepping configuration reduces power module: current voltage and the X of power module are subtracted each other, use and subtract each other the result and upgrade the current voltage of power module.Because the ACPR value that calculates is two, i.e. ACPR_H and ACPR_L, the described ACPR of judging less than desired value is: judge the ACPR_H that calculates and ACPR_L all less than desired value, think that then ACPR is less than desired value; The absolute value of the difference of the described ACPR of judging and desired value greater than preset value is: judge the absolute value of difference of the ACPR_H that calculates and ACPR_L and desired value all greater than preset value, think that then the absolute value of difference of ACPR and desired value is greater than preset value.
Referring to Fig. 5, the method flow diagram example for the present invention adjusts the RRU drain voltage in the present embodiment, calculates ACPR by control and signal processor, and this flow process may further comprise the steps:
In order further to reduce energy loss, this step can be set to voltage minimum by the voltage initial value, and in this case, the RRU drain voltage is adjusted toward high from low.Natch, also can be set to voltage max by the voltage initial value, in this case, the RRU drain voltage is adjusted toward low from high.
This step is the general step that carries out before the RRU drain voltage is adjusted, and for example, can also comprise processing such as setting up the residential quarter or carry out that cell re-configuration is put.
This step can periodically be carried out.
ACPR can adopt existing mode to calculate.
The present invention adjusts the drain voltage of power amplifier in real time according to the output signal of power amplifier, forms the adjustment of a closed loop, makes the ACPR of output signal near desired value, thereby reaches the effect of further reduction energy loss.And the present invention program need not to increase extra EEPROM with the corresponding relation between storage peak power output and the supply voltage, just can realize adjustment to drain voltage based on the RRU self structure, thereby reduce cost; Correspondingly, do not need to extract the corresponding relation between peak power output and the supply voltage, saved workload.Moreover, directly the drain voltage of power amplifier is adjusted according to the output voltage of power amplifier, its precision height, and by measuring ACPR, can also carry out the fault detect of passage,
The present invention program is applicable to single pass RRU and multichannel RRU, and can be applied to multiple systems, inserts (WCDMA, Wideband Code Division Multiple Access) system etc. as TD-SCDMA system, LTE system or Wideband Code Division Multiple Access (WCDMA).
The above only is preferred embodiment of the present invention, and is in order to limit the present invention, within the spirit and principles in the present invention not all, any modification of making, is equal to replacement, improvement etc., all should be included within the scope of protection of the invention.
Claims (8)
1. a radio frequency remote unit RRU is characterized in that, this RRU comprises feedback network, calculates judging unit, power module and power amplifier;
Described feedback network, the output signal that is used for gathering power amplifier sends described calculating judging unit to;
Described calculating judging unit, compare ACPR for the neighboring trace leakage power that calculates described output signal, judge described ACPR greater than the absolute value of the difference of desired value and described ACPR and desired value greater than preset value, then according to setting the voltage that the stepping configuration increases described power module; Be less than or equal to preset value if judge the absolute value of the difference of described ACPR and desired value, then the voltage of power module do not adjusted;
Described power module is used for according to the voltage of described calculating judging unit configuration described power amplifier being powered;
Described power amplifier is used for carrying out according to the power supply of power module the amplification output of signal.
2. RRU as claimed in claim 1 is characterized in that, described calculating judging unit comprises on-site programmable gate array FPGA and control and signal processor;
Described FPGA is used for calculating the ACPR of described output signal, judge described ACPR greater than the absolute value of the difference of desired value and described ACPR and desired value greater than preset value, then send to adjust to described control and signal processor and instruct;
Described control and signal processor are used for after receiving the adjustment instruction, according to setting the voltage that the stepping configuration increases described power module.
3. RRU as claimed in claim 1 is characterized in that, described calculating judging unit comprises FPGA and control and signal processor;
Described FPGA is used for receiving the output signal that described feedback network transmits, and sends described control and signal processor to;
Described control and signal processor are used for calculating the ACPR of described output signal, judge described ACPR greater than the absolute value of the difference of desired value and described ACPR and desired value greater than preset value, then according to the voltage of setting the described power module of stepping configuration increase.
4. as claim 1,2 or 3 described RRU, it is characterized in that, described calculating judging unit be further used for judge ACPR less than the absolute value of the difference of desired value and described ACPR and desired value greater than preset value, then according to setting the voltage that the stepping configuration reduces described power module.
5. the method that the radio frequency remote unit RRU drain voltage is adjusted is characterized in that, this method comprises:
Feedback network is gathered the output signal of power amplifier;
The neighboring trace leakage power that the calculating judging unit calculates described output signal compares ACPR;
Calculate judgment unit judges go out described ACPR greater than the absolute value of the difference of desired value and described ACPR and desired value greater than preset value, then according to setting the voltage that the stepping configuration increases power module, return the step that described feedback network is gathered the output signal of power amplifier; Be less than or equal to preset value if judge the absolute value of the difference of described ACPR and desired value, then the voltage of power module do not adjusted;
The voltage of power amplifier after according to the power module adjustment carries out the amplification output of signal.
6. method as claimed in claim 5 is characterized in that, the described ACPR that calculates described output signal comprises:
The output signal of gathering is carried out Fourier transform;
Calculate available signal power P1 and P2 in the output signal;
Calculate neighboring trace signal power P3 and P4 in the output signal;
Calculate two ACPR values by formula ACPR_H=20log10 (P3/P1) and ACPR_L=20log10 (P4/P2);
Describedly judge described ACPR and greater than desired value be: judge that any one thinks then that greater than desired value ACPR is greater than desired value among the ACPR_H that calculates and the ACPR_L.
7. method as claimed in claim 5 is characterized in that, this method also comprises:
If calculate judgment unit judges go out ACPR less than the absolute value of the difference of desired value and described ACPR and desired value greater than preset value, then dispose the voltage that reduces power module according to setting stepping, return the step of the output signal of described collection power amplifier.
8. as each described method in the claim 5 to 7, it is characterized in that described desired value is set to-40dB, perhaps described desired value is set to: under the normal temperature for being-43dB under-45dB, high temperature and the low temperature.
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| CN102724740B (en) * | 2012-05-30 | 2018-03-23 | 中兴通讯股份有限公司 | A kind of method and system for controlling power consumption of radio frequency remote unit |
| CN103650600B (en) * | 2013-07-08 | 2018-06-05 | 华为技术有限公司 | Remote Radio Unit and relevant device |
| CN107222888A (en) * | 2016-03-22 | 2017-09-29 | 大唐移动通信设备有限公司 | A kind of RRU antiblockings implementation method and device, RRU |
| CN108366419A (en) * | 2018-01-05 | 2018-08-03 | 京信通信系统（中国）有限公司 | A kind of output power control method, controller and output power regulator |
| CN113872629B (en) * | 2020-06-12 | 2023-04-18 | 华为技术有限公司 | Information transmission method, device and storage medium |
| CN114826436A (en) * | 2022-04-06 | 2022-07-29 | Oppo广东移动通信有限公司 | Detection method, detection device, electronic equipment and computer readable medium |
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| CN101567667A (en) * | 2009-04-24 | 2009-10-28 | 福建三元达通讯股份有限公司 | Enhancement type analog predistortion linear power amplifier |
| CN101720528A (en) * | 2007-04-23 | 2010-06-02 | 大力系统有限公司 | Digital hybrid mode power amplifier system |
| CN101729029A (en) * | 2008-10-30 | 2010-06-09 | 苹果公司 | Electronic devices with calibrated radio frequency communications circuitry |
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| JP2007312118A (en) * | 2006-05-18 | 2007-11-29 | Toshiba Corp | Power amplifier and adjusting method thereof |
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|---|---|---|---|---|
| CN101720528A (en) * | 2007-04-23 | 2010-06-02 | 大力系统有限公司 | Digital hybrid mode power amplifier system |
| CN101729029A (en) * | 2008-10-30 | 2010-06-09 | 苹果公司 | Electronic devices with calibrated radio frequency communications circuitry |
| CN101567667A (en) * | 2009-04-24 | 2009-10-28 | 福建三元达通讯股份有限公司 | Enhancement type analog predistortion linear power amplifier |
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