CN102111195A - Overpower protection method for power amplifiers of remote radio unit (RRU) system - Google Patents
Overpower protection method for power amplifiers of remote radio unit (RRU) system Download PDFInfo
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- CN102111195A CN102111195A CN2010106115119A CN201010611511A CN102111195A CN 102111195 A CN102111195 A CN 102111195A CN 2010106115119 A CN2010106115119 A CN 2010106115119A CN 201010611511 A CN201010611511 A CN 201010611511A CN 102111195 A CN102111195 A CN 102111195A
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- 230000033228 biological regulation Effects 0.000 claims description 6
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- 230000002452 interceptive effect Effects 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 3
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- 230000006870 function Effects 0.000 description 7
- 238000007796 conventional method Methods 0.000 description 3
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Abstract
本发明公开了一种远端射频单元系统功放过功率保护方法，涉及一种远端射频单元系统。本发明区别于只能保护一定范围大信号的传统方法，提供了一种可以完全抑制大信号输入的方法，该方法是在数字域实现，其对所需抑制的大信号可以灵活定义，例如功率和时长，这可以使其对不同特性的功放进行不同的保护策略，对于规定门限之上的大信号可以达到完全屏蔽的效果，而且该方法无需增加额外的器件电路，只需作为一个功能模块在RRU中的现场可编程门阵列（FPGA）器件集成即可。本发明适用于信号允许有适当延时，功放需要保护的信号发射系统。
The invention discloses a remote radio frequency unit system power amplifier overpower protection method, which relates to a remote radio frequency unit system. The present invention is different from the traditional method that can only protect a certain range of large signals, and provides a method that can completely suppress the input of large signals. This method is implemented in the digital domain, and it can flexibly define the large signals that need to be suppressed, such as power and duration, which can make different protection strategies for power amplifiers with different characteristics, and can achieve a complete shielding effect for large signals above the specified threshold, and this method does not need to add additional device circuits, only as a functional module in the The field programmable gate array (FPGA) device in the RRU can be integrated. The invention is suitable for signal transmission systems where appropriate delay is allowed for signals and power amplifiers need to be protected.
Description
Technical field
The present invention relates to a kind of remote radio unit (RRU) system, relate in particular to a kind of remote radio unit (RRU) system power amplifier overpower protection method.
Background technology
Remote radio unit (RRU) (RRU) is a part important in the 3G communication system, for being attached to a communication module of base station (NODE B).The RRU major function is to finish the blind area to cover, and reduces base station number, and this module can be delivered to the upper-level BTS that is depended on data by optical fiber.
RRU has the radio frequency transmit and receive function, and the realization of emission function depends on power amplifier module, and the quality of power amplifier module is determining radio-frequency (RF) index quality and the covering power of RRU.RRU has very high requirement to the Overall Power Consumption index simultaneously, and the power consumption of RRU depends on the efficient of power amplifier module to a great extent, therefore all can improve the efficient of power amplifier in design as far as possible, allows power amplifier work in the scope of its limit.The drawback of bringing like this is exactly that power amplifier is very fragile, and instantaneous big slightly signal input just might be burnt power amplifier.And might occur unusually owing to link in the course of work that is created in RRU of large-signal.
Therefore how power amplifier effectively being protected is major issue in the RRU system.Conventional method is to add the simulation protective circuit in power amplifier, and this method has improved the manufacturing cost of power amplifier on the one hand, has increased the volume of power amplifier; It also is limited to the protection of large-signal input on the other hand, and the large-signal that surpasses certain power bracket can make power amplifier burn equally.
Summary of the invention
The objective of the invention is in order to overcome the defective that above-mentioned conventional method exists, a kind of remote radio unit (RRU) system power amplifier overpower protection method is provided.
The object of the present invention is achieved like this:
The present invention is different from the conventional method that can only protect the certain limit large-signal; a kind of method that can suppress the large-signal input fully is provided; this method is to realize at numeric field; its large-signal to required inhibition can define flexibly; for example power and duration; this can make its power amplifier to different qualities carry out different protection strategies; can reach the effect of shielding fully for the large-signal on the specified thresholds; and this method need not to increase extra device circuitry, only needs as field programmable gate array (FPGA) device integrated get final product of a functional module in RRU.
Specifically, this method is that the tail end of the field programmable gate array (FPGA) in the remote radio unit (RRU) system is provided with power amplifier overpower protection module;
Power amplifier overpower protection module comprises can join time delay module, can join power meter module and gate controlled switch module;
Its interactive relation is:
Can join time delay module to the input signal output of delaying time, delay value can dispose, and its role is to the signal of regulation duration is carried out buffer memory, for power statistic provides the time, guarantees that large-signal can actual transmission not go out in the power statistic process;
Can join the power meter module signal of regulation duration is carried out the realtime power statistics, duration can dispose arbitrarily, and numerical value is provided with identical with the delay value that can join time delay module usually;
The gate controlled switch module is controlled by single control line, and two states is arranged, straight-through and output zero; In the time can joining power meter module output statistics power greater than appointed threshold, just represent input signal power excessive, can turn-off output, be output as zero; When input power during less than appointed threshold, the output of gate controlled switch module is communicated with input.
Operation principle of the present invention is: in the RRU system, a spot of several microsecond time-delay is an acceptable, the present invention is according to this characteristic, carry out suitable time-delay to transmitting, and in this section time-delay process, the time delayed signal realtime power is added up, in case find the excessive situation of power, gate controlled switch will turn-off, have only after the power of input signal is normal, gate controlled switch just reopens.
The present invention has following advantage and good effect:
1. realizing simply need not to increase additional devices and circuit, is a kind of pure software implementation method;
2. user flexibility definition large signal characteristic is realized fully accurately intercepting to the large-signal under its definition;
3. be applicable to that signal allows suitable time-delay, the signal transmitting system that power amplifier needs protection.
Description of drawings
Fig. 1 is the structured flowchart of native system;
Fig. 2 is the structured flowchart of RRU down link;
Fig. 3 is the structured flowchart that is provided with the RRU down link of power amplifier overpower protection module;
Fig. 4 is the structured flowchart of power amplifier overpower protection module.
Wherein:
100-remote radio unit (RRU),
110-at a high speed string and modular converters; 120---the Digital Up Convert module;
130-peak-clipping module; 140-digital pre-distortion module;
150-power amplifier overpower protection module,
151-can join time delay module, 152-the power meter module can be joined, 153-gate controlled switch module.
160-Digital To Analog Convert; 170---analog inverter;
180-power amplifier.
200-base station.
300-mobile phone.
X-field programmable logic array.
Embodiment
Describe in detail below in conjunction with drawings and Examples:
One, legacy system
As Fig. 1, legacy system comprises base station 200, remote radio unit (RRU) 100 and the mobile phone 200 that is communicated with successively.
As Fig. 2, the down link of existing remote radio unit (RRU) 100 comprises field programmable logic array X, Digital To Analog Convert 160, analog inverter 170 and the power amplifier 180 that connects successively.
Field programmable logic array X is the hardware programmable chip, can be by hardware description language to the function of its various customization of realization of programming, in remote radio unit (RRU) 100, the software function of its realization comprises successively the high speed string that is communicated with and modular converter 110, Digital Up Convert module 120, peak-clipping module (CFR) 130, digital pre-distortion module (DPD) 140.
Two, native system
As Fig. 3, native system is on the basis of legacy system, is provided with power amplifier overpower protection module 150 after digital pre-distortion module 140.
In order to improve power amplification efficiency and radio-frequency (RF) index performance, the employing of peak clipping (CFR) and digital pre-distortion technology such as (DPD) has all become main flow.And as the height of system integrated and design flexibility, these functions all are integrated among the FPGA as module.Native system also is based on the RRU design platform of this main flow and realizes, has added the RRU downlink system of attacking and defending overpower protection function exactly.Power amplifier overpower protection module 150 is to be different from legacy system and newly-increased functional module, and it is positioned at the least significant end of all Digital Signal Processing, before digital to analog converter, can suppress the unusual large-signal of numeric field.
As Fig. 4, power amplifier overpower protection module 150 comprises can join time delay module 151, can join power meter module 152 and gate controlled switch module 153.
Three, the workflow of power amplifier overpower protection module 150
The workflow of power amplifier overpower protection module 150 comprises the following steps:
1. data enter and can join time delay module 151, just can export through the delay data of regulation;
2. the while data enter and can join power meter module 152, and power meter can calculate in real time be buffered in the signal power that can join in the time delay module 151;
3. when the signal power of step in 2. during greater than the overpower thresholding, 153 pairs of output signals of gate controlled switch module are turn-offed processing, are cached in the externally output of overpower danger signal that can join in the time delay module 151 this moment;
4. when the signal power of step in 2. during less than the overpower thresholding, gate controlled switch module 153 allows the output signal that can join time delay module 151 normally pass through.
Key point of the present invention is that the digital signal of final stage output is carried out caching process, the degree of depth of buffer memory can be configured according to real system, be described by " signal duration " and " overpower thresholding " two parameters for being defined in this module of overpower signal, " signal duration " is presented as the time delay of " can join time delay module " and " can join power meter " in module, " overpower thresholding " is presented as that in module the switch in " gate controlled switch " switches foundation.
In the real system, different power amplifier characteristics and different large-signals can be described by two top parameters, and concrete numerical value also can be different variant because of system.
As long as have this digitized processing process in the system, and allow under the situation of suitable time-delay, this module can be suitable for.The special analog-to-digital conversion that adopts in order to adopt this module to carry out the power amplifier overpower protection in addition, and then to carry out digital-to-analogue conversion also be a kind of special case that this module is used.
Claims (2)
1. remote radio unit (RRU) system power amplifier overpower protection method, the system that its workbench is made up of the base station (200), remote radio unit (RRU) (100) and the mobile phone (200) that are communicated with successively; Remote radio unit (RRU) (100) comprise successively connect based on field programmable logic array (X), Digital To Analog Convert (160), analog inverter (170) and power amplifier (180); Field programmable logic array (X) comprises successively the high speed string that is communicated with and modular converter (110), Digital Up Convert module (120), peak-clipping module (130), digital pre-distortion module (140);
It is characterized in that:
After digital pre-distortion module (140), be provided with power amplifier overpower protection module (150);
Power amplifier overpower protection module (150) comprises can join time delay module (151), can join power meter module (152) and gate controlled switch module (153);
Its interactive relation is:
Can join time delay module to the input signal output of delaying time, delay value can dispose, and its role is to the signal of regulation duration is carried out buffer memory, for power statistic provides the time, guarantees that large-signal can actual transmission not go out in the power statistic process;
Can join the power meter module signal of regulation duration is carried out the realtime power statistics, duration can dispose arbitrarily, and numerical value is provided with identical with the delay value that can join time delay module usually;
The gate controlled switch module is controlled by single control line, and two states is arranged, straight-through and output zero; In the time can joining power meter module output statistics power greater than appointed threshold, just represent input signal power excessive, can turn-off output, be output as zero; When input power during less than appointed threshold, the output of gate controlled switch module is communicated with input.
2. by the described power amplifier overpower protection of claim method, it is characterized in that the workflow of power amplifier overpower protection module (150) comprises the following steps:
1. data enter and can join time delay module (151), just can export through the delay data of regulation;
2. the while data enter and can join power meter module (152), and power meter can calculate in real time be buffered in the signal power that can join in the time delay module (151);
3. when the signal power of step in 2. during greater than the overpower thresholding, gate controlled switch module (153) is turn-offed processing to output signal, is cached in the externally output of overpower danger signal that can join in the time delay module (151) this moment;
4. when the signal power of step in 2. during less than the overpower thresholding, gate controlled switch module (153) allows the output signal that can join time delay module (151) normally pass through.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010106115119A CN102111195B (en) | 2010-12-29 | 2010-12-29 | Overpower protection method for power amplifiers of remote radio unit (RRU) system |
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| CN2010106115119A CN102111195B (en) | 2010-12-29 | 2010-12-29 | Overpower protection method for power amplifiers of remote radio unit (RRU) system |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102780460A (en) * | 2012-07-06 | 2012-11-14 | 大唐移动通信设备有限公司 | PA (power amplifier) overpower protecting method and device |
| CN102938658A (en) * | 2012-11-23 | 2013-02-20 | 中国人民解放军国防科学技术大学 | Radio-frequency front end protecting unit |
| CN102984740A (en) * | 2012-08-17 | 2013-03-20 | 大唐移动通信设备有限公司 | Ratio frequency remote unit power protective method and ratio frequency remote unit power protective system |
| CN103187934A (en) * | 2011-12-30 | 2013-07-03 | 中兴通讯股份有限公司 | Protection method for radio frequency power amplifier and RRU (remote RF (radio frequency) unit) |
| WO2013097355A1 (en) * | 2011-12-30 | 2013-07-04 | 中兴通讯股份有限公司 | Method and device for power amplifier protection in digital predistortion |
| WO2013097713A1 (en) * | 2011-12-26 | 2013-07-04 | 华为技术有限公司 | Remote radio unit and power consumption limiting method therefor, and base station controller |
| WO2014110899A1 (en) * | 2013-01-16 | 2014-07-24 | 华为技术有限公司 | Method, device and base station system for transceiving and processing radio frequency signal |
| CN105024657A (en) * | 2014-04-30 | 2015-11-04 | 京信通信系统（中国）有限公司 | Power amplifier protection method and system |
| US9432063B2 (en) | 2013-01-16 | 2016-08-30 | Huawei Technologies Co., Ltd. | Radio frequency signal transceiving and processing method, device, and base station system |
| WO2019080566A1 (en) * | 2017-10-26 | 2019-05-02 | 京信通信系统（中国）有限公司 | Power amplifier protection method and device |
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2010
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013097713A1 (en) * | 2011-12-26 | 2013-07-04 | 华为技术有限公司 | Remote radio unit and power consumption limiting method therefor, and base station controller |
| CN103187934A (en) * | 2011-12-30 | 2013-07-03 | 中兴通讯股份有限公司 | Protection method for radio frequency power amplifier and RRU (remote RF (radio frequency) unit) |
| WO2013097355A1 (en) * | 2011-12-30 | 2013-07-04 | 中兴通讯股份有限公司 | Method and device for power amplifier protection in digital predistortion |
| CN102780460A (en) * | 2012-07-06 | 2012-11-14 | 大唐移动通信设备有限公司 | PA (power amplifier) overpower protecting method and device |
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| CN102984740A (en) * | 2012-08-17 | 2013-03-20 | 大唐移动通信设备有限公司 | Ratio frequency remote unit power protective method and ratio frequency remote unit power protective system |
| CN102984740B (en) * | 2012-08-17 | 2015-09-09 | 大唐移动通信设备有限公司 | A kind of Remote Radio Unit power guard method and system |
| CN102938658A (en) * | 2012-11-23 | 2013-02-20 | 中国人民解放军国防科学技术大学 | Radio-frequency front end protecting unit |
| WO2014110899A1 (en) * | 2013-01-16 | 2014-07-24 | 华为技术有限公司 | Method, device and base station system for transceiving and processing radio frequency signal |
| US9432063B2 (en) | 2013-01-16 | 2016-08-30 | Huawei Technologies Co., Ltd. | Radio frequency signal transceiving and processing method, device, and base station system |
| CN105024657A (en) * | 2014-04-30 | 2015-11-04 | 京信通信系统（中国）有限公司 | Power amplifier protection method and system |
| WO2019080566A1 (en) * | 2017-10-26 | 2019-05-02 | 京信通信系统（中国）有限公司 | Power amplifier protection method and device |
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| CN102111195B (en) | 2013-07-31 |
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