CN113726397B - Anti-interference self-adaptive trunk amplifier, system and signal processing system - Google Patents
Anti-interference self-adaptive trunk amplifier, system and signal processing systemDownload PDFInfo
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- CN113726397B CN113726397BCN202110977141.9ACN202110977141ACN113726397BCN 113726397 BCN113726397 BCN 113726397BCN 202110977141 ACN202110977141 ACN 202110977141ACN 113726397 BCN113726397 BCN 113726397B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15507—Relay station based processing for cell extension or control of coverage area
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15535—Control of relay amplifier gain
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/14—Relay systems
- H04B7/15—Active relay systems
- H04B7/155—Ground-based stations
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15542—Selecting at relay station its transmit and receive resources
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- Y02D—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
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- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
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Abstract
Translated fromChinese
Description
Translated fromChinese技术领域technical field
本发明涉及通信领域，具体地，涉及一种抗干扰自适应干线放大器及系统，更为具体的，本发明涉及一种医院内抗干扰自适应干线放大器、信号处理系统及抗干扰自适应系统。The invention relates to the field of communications, in particular, to an anti-interference adaptive trunk amplifier and system, and more specifically, to an anti-interference adaptive trunk amplifier, a signal processing system and an anti-interference adaptive system in a hospital.
背景技术Background technique
电子病历作为医疗临床信息化的核心已经发展了15年，与电子病历相配套的移动查房和床边护理也已成为医院最重要的无线移动应用。护士在日常护理工作中，需要使用PDA来查看和执行医嘱，进行三查七对工作。由于护士一直是在移动中执行医嘱，因此对无线网络的稳定性要求很高。传统WiFi无线网络的覆盖方式是采用多AP方式，但这种方式会导致PDA在移动中出现带宽不稳定、虚连接和丢包等不稳定现象。为了提高WiFi无线网络的稳定性，医院改用室分系统覆盖方式，将基站装在病区弱电间内，从原理性上去除了上述的不稳定因素。由于病区的结构复杂，大多病房在走道侧又卫生间，不利于无线信号的传输，尤其是5GHz频段的WiFi信号，因此要求室分系统的天线进入每间病房。As the core of medical clinical informatization, electronic medical records have been developed for 15 years, and mobile ward rounds and bedside care supporting electronic medical records have also become the most important wireless mobile applications in hospitals. In daily nursing work, nurses need to use PDA to view and execute doctor's orders, and conduct three checks and seven pairs of work. Since nurses are always on the move, they have high demands on the stability of the wireless network. The coverage method of traditional WiFi wireless network is to use multi-AP method, but this method will lead to unstable bandwidth, virtual connection and packet loss of the PDA while moving. In order to improve the stability of the WiFi wireless network, the hospital switched to the coverage of the room division system, and installed the base station in the weak current room of the ward, which eliminated the above-mentioned unstable factors in principle. Due to the complex structure of the ward, most of the wards have toilets on the side of the aisle, which is not conducive to the transmission of wireless signals, especially the WiFi signals in the 5GHz frequency band. Therefore, the antenna of the room sub-system is required to enter each ward.
室分系统在不受外界干扰的情况下，自身具有稳定性、可靠性、安全性和可维护性高等优点，但由于其天线覆盖面积广，受外部其他干扰源的影响也更大，尤其是在2.4GHz频段，医院存在大量无序干扰源，如第三方WiFi AP、微波炉、微波治疗仪、工作在2.4GHz频段的蓝牙和Zigbee信号、私有2.4GHz信号、运营商4G/5G边带(2390MHz和2515MHz)杂散等干扰信号，不同医院、不同病区、不同时间段的干扰频段、干扰强度都可能不同，因此需要多种一个自适应的抗干扰自适应技术方案来化解应对这些挑战，保证无线网络系统在不同的干扰环境中，都能够调整到最佳的状态。The indoor sub-system has the advantages of high stability, reliability, safety and maintainability without external interference, but due to its wide antenna coverage, it is also more affected by other external interference sources, especially In the 2.4GHz frequency band, there are a large number of disordered interference sources in the hospital, such as third-party WiFi APs, microwave ovens, microwave therapy devices, Bluetooth and Zigbee signals working in the 2.4GHz frequency band, private 2.4GHz signals, and operators’ 4G/5G sidebands (2390MHz). and 2515MHz) stray and other interference signals, the interference frequency band and interference intensity may be different in different hospitals, different wards, and different time periods. The wireless network system can be adjusted to the best state in different interference environments.
普通2.4GHz频段的干放上行端是宽频的，容易受强干扰而出现射频开关反转甚至自激等不稳定现象，如果在干放输出端加WiFi信道滤波器，则可以降低带外干扰，改善干放的稳定性，但解决不了带内干扰问题。由于干扰不稳定，当强干扰进入正在工作的WiFi信道的带内，这时唯一可做的就是改变WiFi基站的工作信道，可是由于干放输出端有对应信道的WiFi信道滤波器，因此要换WiFi基站的工作信道就要同时将干放输出端的信道滤波器一起换掉，换成对应新信道的WiFi信道滤波器，这就非常麻烦，需要施工队协助，很不灵活。The upstream end of the ordinary 2.4GHz frequency band is wide-band, and it is easy to be affected by strong interference, resulting in unstable phenomena such as RF switch reversal or even self-excitation. If a WiFi channel filter is added to the output of the dry amplifier, out-of-band interference can be reduced. Improve the stability of dry discharge, but can not solve the problem of in-band interference. Due to the unstable interference, when the strong interference enters the band of the working WiFi channel, the only thing that can be done is to change the working channel of the WiFi base station. The working channel of the WiFi base station needs to replace the channel filter at the output end of the dry amplifier at the same time, and replace it with the WiFi channel filter corresponding to the new channel, which is very troublesome, requires the assistance of the construction team, and is very inflexible.
专利文献为CN201238301Y的实用新型专利公开了一种WLAN干线放大器,用于室内覆盖系统的干线信号放大,其包括射频放大模块和同步控制模块,所述射频放大模块采用时分复用模式,对上行链路的输入信号进行低噪放大处理,对下行链路的输入信号进行功率放大处理,所述射频放大模块包括上行低噪链路和下行功放链路,所述同步控制模块包括耦合器,检波器,比较放大器,反相器。本实用新型WLAN干线放大器的上、下行链路能实现自动切换和自动电平控制,稳定输出功率,便于工程的应用和维护；本WLAN干线放大器还能实现增益调节。但是上述方案无法解决强干扰对功放稳定性造成的影响问题。The patent document is a utility model patent of CN201238301Y, which discloses a WLAN trunk line amplifier, which is used for the trunk line signal amplification of an indoor coverage system, which includes a radio frequency amplifying module and a synchronization control module. The input signal of the channel is subjected to low-noise amplification processing, and the input signal of the downlink is subjected to power amplification processing. The radio frequency amplification module includes an uplink low-noise link and a downlink power amplifier link, and the synchronization control module includes a coupler and a detector. , Comparing amplifiers, inverters. The uplink and downlink of the WLAN trunk amplifier of the utility model can realize automatic switching and automatic level control, stabilize the output power, and facilitate engineering application and maintenance; the WLAN trunk amplifier can also realize gain adjustment. However, the above solutions cannot solve the problem of the influence of strong interference on the stability of the power amplifier.
发明内容SUMMARY OF THE INVENTION
针对现有技术中的缺陷，本发明的目的是提供一种2.4GHzWiFi干线放大器及系统。In view of the defects in the prior art, the purpose of the present invention is to provide a 2.4GHz WiFi trunk amplifier and system.
根据本发明提供的一种抗干扰自适应干线放大器，包括第一功率分配器、第一射频开关、控制电路、第一检波器、第一比较电路、开关控制信号、下行放大链路以及第二射频开关，所述下行放大链路包括第一可变衰减器、功率放大器以及运算放大器，其中：An anti-interference adaptive trunk amplifier provided according to the present invention includes a first power divider, a first radio frequency switch, a control circuit, a first detector, a first comparison circuit, a switch control signal, a downlink amplification link and a second A radio frequency switch, the downlink amplification chain includes a first variable attenuator, a power amplifier and an operational amplifier, wherein:
下行信号依次通过第一功率分配器、第一射频开关、下行放大链路、第二射频开关后输出；The downlink signal is output after passing through the first power divider, the first radio frequency switch, the downlink amplifying link, and the second radio frequency switch in sequence;
第一功率分配器与第一检波器电连接；the first power divider is electrically connected to the first detector;
第一比较电路判断第一检波器的输出电平和第一参考电平，并输出结果至开关控制信号，开关控制信号控制第一射频开关和第二射频开关并反馈至控制电路；The first comparison circuit judges the output level of the first detector and the first reference level, and outputs the result to a switch control signal, and the switch control signal controls the first radio frequency switch and the second radio frequency switch and feeds it back to the control circuit;
控制电路根据第一检波器接收的基站信标信号强度，自适应设定第一参考电平；The control circuit adaptively sets the first reference level according to the signal strength of the base station beacon received by the first detector;
控制电路控制第一可变衰减器和开关控制信号。The control circuit controls the first variable attenuator and the switch control signal.
优选地，还包括第二检波器、第二比较电路以及上行放大链路，所述上行放大链路包括低噪放、第二功率分配器、第二可变衰减器以及推动级放大器，其中：Preferably, it also includes a second detector, a second comparison circuit and an uplink amplifier chain, the uplink amplifier chain includes a low noise amplifier, a second power divider, a second variable attenuator and a booster amplifier, wherein:
所述第二射频开关电连接开关控制信号、功率放大器；the second radio frequency switch is electrically connected to the switch control signal and the power amplifier;
第二射频开关、低噪放、第二功率分配器、第二检波器、第二比较电路以及控制电路依次连接；The second radio frequency switch, the low noise amplifier, the second power divider, the second detector, the second comparison circuit and the control circuit are connected in sequence;
第二功率分配器、第二可变衰减器、推动级放大器以及第一射频开关依次连接；The second power divider, the second variable attenuator, the booster stage amplifier and the first radio frequency switch are connected in sequence;
控制电路控制所述第二可变衰减器和第二参考电平。A control circuit controls the second variable attenuator and the second reference level.
优选地，所述第二比较电路比较第二参考电平和第二检波器的输出电平，若第二检波器的输出电平大于第二参考电平，则触发控制电路中断，控制电路控制第二可变衰减器信号衰减；若第二检波器的输出电平不大于第二参考电平，则不执行操作；在第二射频开关处于上行状态时，测量第二检波器的输出电平值，当所述输出电平值持续一段时间T均低于第二参考电平减去一个固定差值时，如果第二衰减器的衰减值大于零，则调低一个单位，直至零为止。Preferably, the second comparison circuit compares the second reference level with the output level of the second detector, and if the output level of the second detector is greater than the second reference level, the control circuit is triggered to interrupt, and the control circuit controls the first detector. Two variable attenuators signal attenuation; if the output level of the second detector is not greater than the second reference level, no operation is performed; when the second radio frequency switch is in the upstream state, the output level value of the second detector is measured , when the output level value is lower than the second reference level minus a fixed difference for a period of time T, if the attenuation value of the second attenuator is greater than zero, it is adjusted down by one unit until it is zero.
优选地，第二参考电平与第一参考电平之间的差值是一个预设的固定值。Preferably, the difference between the second reference level and the first reference level is a preset fixed value.
优选地，当下行放大链路、上行放大链路的射频增益达到设定增益值时，第一功率分配器采用耦合器或者功分器；Preferably, when the radio frequency gain of the downlink amplification link and the uplink amplification link reaches the set gain value, the first power divider adopts a coupler or a power divider;
当下行放大链路、上行放大链路的射频增益未达到设定增益值时，第一功率分配器采用耦合器。When the radio frequency gain of the downlink amplification link and the uplink amplification link does not reach the set gain value, the first power divider adopts a coupler.
优选地，下行放大链路、上行放大链路的射频增益达到设定增益值，第一功率分配器采用耦合器时，耦合器的直通端连接第一检波器，耦合器的耦合端连接第一射频开关；Preferably, the radio frequency gain of the downlink amplification link and the uplink amplification link reaches the set gain value. When the first power divider adopts a coupler, the straight end of the coupler is connected to the first detector, and the coupling end of the coupler is connected to the first detector. RF switch;
下行放大链路、上行放大链路的射频增益未达到设定增益值，第一功率分配器采用耦合器时，耦合器的耦合端连接第一检波器，耦合器的直通端连接第一射频开关。The RF gain of the downlink amplification link and the uplink amplification link does not reach the set gain value. When the first power divider adopts a coupler, the coupling end of the coupler is connected to the first detector, and the straight end of the coupler is connected to the first RF switch. .
根据本发明提供的一种信号处理系统，包括合路器和上述的抗干扰自适应干线放大器，所述抗干扰自适应干线放大器和合路器电性连接。A signal processing system provided according to the present invention includes a combiner and the above-mentioned anti-interference adaptive trunk amplifier, wherein the anti-interference adaptive trunk amplifier and the combiner are electrically connected.
优选地，所述合路器包括2.4GHz频段输入端口和5GHz频段输入端口，所述2.4GHz频段输入端口为抗干扰保护的2.4GHz频段输入端口。Preferably, the combiner includes a 2.4GHz frequency band input port and a 5GHz frequency band input port, and the 2.4GHz frequency band input port is an anti-interference protected 2.4GHz frequency band input port.
根据本发明提供的一种抗干扰自适应系统，包括WIFI基站、射频功率分配系统、室分系统、WIFI信道自适应控制器、WIFI信道自适应评估终端以及上述的信号处理系统，其中：An anti-interference adaptive system provided according to the present invention includes a WIFI base station, a radio frequency power distribution system, a room division system, a WIFI channel adaptive controller, a WIFI channel adaptive evaluation terminal and the above-mentioned signal processing system, wherein:
WIFI信道自适应控制器通过医院内部局域网、楼层交换机与WIFI基站通信连接；The WIFI channel adaptive controller communicates with the WIFI base station through the hospital's internal LAN and floor switches;
WIFI信道自适应评估终端与室分系统通信连接；The WIFI channel self-adaptive evaluation terminal communicates with the room sub-system;
WIFI基站、射频功率分配系统、抗干扰自适应干线放大器、合路器以及室分系统依次连接。The WIFI base station, the radio frequency power distribution system, the anti-interference adaptive trunk amplifier, the combiner and the room distribution system are connected in sequence.
优选地，所述室分系统通过信号处理系统连接抗干扰自适应干线放大器的第二射频开关；Preferably, the room sub-system is connected to the second radio frequency switch of the anti-interference adaptive trunk amplifier through a signal processing system;
所述WIFI基站通过射频功率分配系统连接抗干扰自适应干线放大器的第一功率分配器。The WIFI base station is connected to the first power distributor of the anti-interference adaptive trunk amplifier through a radio frequency power distribution system.
与现有技术相比，本发明具有如下的有益效果：Compared with the prior art, the present invention has the following beneficial effects:
1、本发明通过设置抗干扰自适应干线放大器，实现了2.4GHz频段的抗干扰功能。1. The present invention realizes the anti-jamming function of the 2.4GHz frequency band by setting the anti-jamming adaptive trunk amplifier.
2、本发明通过干放在启动阶段探测基站信标信号强度，自适应设定第一参考电平，从而使得干线放大器能够自适应与基站间链路衰减的不确定性。2. The present invention detects the signal strength of the base station beacon during the start-up phase, and adaptively sets the first reference level, so that the trunk amplifier can adapt to the uncertainty of link attenuation between the base station.
3、本发明通过控制逻辑和控制电路，动态设置参考电平，控制可变衰减器，有效的避免了上行信号造成的开关翻转，进而影响通信。3. The present invention dynamically sets the reference level and controls the variable attenuator through the control logic and the control circuit, which effectively avoids the switch overturn caused by the uplink signal, thereby affecting the communication.
4、本发明进一步设置有下行放大链路，通过下行放大链路配合上行放大链路实现下行输出电平的动态自动控制功能。4. The present invention is further provided with a downlink amplifying link, and the dynamic automatic control function of the downlink output level is realized through the downlink amplifying link and the uplink amplifying link.
5、本发明通过WIFI信道自适应控制器与WIFI信道自适应评估终端，实现了最优的信道选择。5. The present invention realizes optimal channel selection through the WIFI channel adaptive controller and the WIFI channel adaptive evaluation terminal.
附图说明Description of drawings
通过阅读参照以下附图对非限制性实施例所作的详细描述，本发明的其它特征、目的和优点将会变得更明显：Other features, objects and advantages of the present invention will become more apparent by reading the detailed description of non-limiting embodiments with reference to the following drawings:
图1为医院内超宽频室内信号分布系统示意图。Figure 1 is a schematic diagram of an ultra-wideband indoor signal distribution system in a hospital.
图2为超宽频室内信号分布系统的医院病区覆盖图例。Figure 2 shows an example of hospital ward coverage of an ultra-wideband indoor signal distribution system.
图3为2.4GHzWiFi抗干扰自适应系统示意图。Figure 3 is a schematic diagram of the 2.4GHz WiFi anti-jamming adaptive system.
图4为2.4GHzWiFi干线放大器示意图。Figure 4 is a schematic diagram of a 2.4GHz WiFi trunk amplifier.
具体实施方式Detailed ways
下面结合具体实施例对本发明进行详细说明。以下实施例将有助于本领域的技术人员进一步理解本发明，但不以任何形式限制本发明。应当指出的是，对本领域的普通技术人员来说，在不脱离本发明构思的前提下，还可以做出若干变化和改进。这些都属于本发明的保护范围。The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but do not limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the inventive concept. These all belong to the protection scope of the present invention.
如图1至图4所示，根据本发明提供的一种2.4GHzWiFi抗干扰自适应干线放大器，包括第一功率分配器、第一射频开关、控制电路、第一检波器、第一比较电路、开关控制信号、下行放大链路、第二射频开关、第二检波器、第二比较电路以及上行放大链路，所述下行放大链路包括第一可变衰减器、功率放大器以及运算放大器，下行信号依次通过第一功率分配器、第一射频开关、下行放大链路、第二射频开关后输出；第一功率分配器与第一检波器电连接；第一比较电路判断第一检波器的输出电平和第一参考电平，并输出结果至开关控制信号，开关控制信号控制第一射频开关和第二射频开关并反馈至控制电路；第一参考电平为自适应设置值；控制电路控制第一可变衰减器和开关控制信号。上行放大链路包括低噪放、第二功率分配器、第二可变衰减器以及推动级放大器，其中：第二射频开关电连接开关控制信号、功率放大器；第二射频开关、低噪放、第二功率分配器、第二检波器、第二比较电路以及控制电路依次连接；第二功率分配器、第二可变衰减器、推动级放大器以及第一射频开关依次连接；控制电路控制所述第二可变衰减器。第二比较电路比较第二参考电平和第二检波器的输出电平，若第二检波器的输出电平大于第二参考电平，则触发控制电路中断。第二参考电平与第一参考电平之间的差值是一个预设的固定值。As shown in FIGS. 1 to 4 , a 2.4GHz WiFi anti-interference adaptive trunk amplifier provided by the present invention includes a first power divider, a first radio frequency switch, a control circuit, a first detector, a first comparison circuit, a switch control signal, a downlink amplifying chain, a second radio frequency switch, a second detector, a second comparison circuit, and an uplink amplifying chain, the downlink amplifying chain includes a first variable attenuator, a power amplifier and an operational amplifier, and the downlink amplifying chain includes a first variable attenuator, a power amplifier and an operational amplifier. The signal is output after passing through the first power divider, the first radio frequency switch, the down-amplifying link and the second radio frequency switch in sequence; the first power divider is electrically connected with the first detector; the first comparison circuit judges the output of the first detector level and the first reference level, and output the result to the switch control signal, the switch control signal controls the first radio frequency switch and the second radio frequency switch and feeds back to the control circuit; the first reference level is an adaptive setting value; the control circuit controls the first radio frequency switch and the second radio frequency switch. A variable attenuator and switch control signal. The uplink amplifying chain includes a low noise amplifier, a second power divider, a second variable attenuator and a booster stage amplifier, wherein: the second radio frequency switch is electrically connected to the switch control signal and the power amplifier; the second radio frequency switch, the low noise amplifier, The second power divider, the second detector, the second comparison circuit and the control circuit are connected in sequence; the second power divider, the second variable attenuator, the booster amplifier and the first radio frequency switch are connected in sequence; the control circuit controls the The second variable attenuator. The second comparison circuit compares the second reference level with the output level of the second detector, and if the output level of the second detector is greater than the second reference level, the control circuit is triggered to interrupt. The difference between the second reference level and the first reference level is a preset fixed value.
进一步地，第一功率分配器包括功分器或者耦合器。当下行放大链路、上行放大链路的射频增益达到设定增益值时，第一功率分配器采用耦合器或者功分器；当下行放大链路、上行放大链路的射频增益未达到设定增益值时，第一功率分配器采用耦合器。下行放大链路、上行放大链路的射频增益达到设定增益值，第一功率分配器采用耦合器时，耦合器的直通端连接第一检波器，耦合器的耦合端连接第一射频开关；下行放大链路、上行放大链路的射频增益未达到设定增益值，第一功率分配器采用耦合器时，耦合器的耦合端连接第一检波器，耦合器的直通端连接第一射频开关。Further, the first power divider includes a power divider or a coupler. When the radio frequency gains of the downlink and uplink amplifier links reach the set gain value, the first power divider adopts a coupler or a power divider; when the radio frequency gains of the downlink and uplink amplifier links do not reach the set value At the gain value, the first power divider adopts a coupler. The radio frequency gain of the downlink amplification link and the uplink amplification link reaches the set gain value. When the first power divider adopts a coupler, the straight-through end of the coupler is connected to the first detector, and the coupling end of the coupler is connected to the first radio frequency switch; The RF gain of the downlink amplification link and the uplink amplification link does not reach the set gain value. When the first power divider adopts a coupler, the coupling end of the coupler is connected to the first detector, and the straight end of the coupler is connected to the first RF switch. .
本发明的控制系统为MCU，能够实现控制功能，包括数模转换、模数转换、中断程序、发送指令等功能。而具体的MCU的型号在此处不予限定。The control system of the present invention is an MCU, which can realize control functions, including functions such as digital-to-analog conversion, analog-to-digital conversion, interrupt program, and sending instructions. The specific MCU model is not limited here.
本发明提供了一种信号处理系统，包括合路器和上述的2.4GHzWiFi干线放大器，所述2.4GHzWiFi干线放大器和合路器电性连接。合路器包括2.4GHz频段输入端口和5GHz频段输入端口，所述2.4GHz频段输入端口为抗干扰保护的2.4GHz频段输入端口。The present invention provides a signal processing system, comprising a combiner and the above-mentioned 2.4GHz WiFi trunk amplifier, wherein the 2.4GHz WiFi trunk amplifier and the combiner are electrically connected. The combiner includes a 2.4GHz frequency band input port and a 5GHz frequency band input port, and the 2.4GHz frequency band input port is an anti-interference protected 2.4GHz frequency band input port.
本发明提供的一种2.4GHzWiFi抗干扰自适应系统，包括WIFI基站、射频功率分配系统、信号处理系统、室分系统以及如上述的2.4GHzWiFi抗干扰自适应干线放大器，其中：WIFI基站、射频功率分配系统、2.4GHzWiFi抗干扰自适应干线放大器、信号处理系统以及室分系统依次连接。室分系统通过信号处理系统连接2.4GHzWiFi抗干扰自适应干线放大器的第二射频开关；WIFI基站通过射频功率分配系统连接2.4GHzWiFi抗干扰自适应干线放大器的第一功率分配器。A 2.4GHz WiFi anti-interference adaptive system provided by the present invention includes a WIFI base station, a radio frequency power distribution system, a signal processing system, a room division system and the above-mentioned 2.4 GHz WiFi anti-interference adaptive trunk amplifier, wherein: the WIFI base station, the radio frequency power The distribution system, the 2.4GHz WiFi anti-jamming adaptive trunk amplifier, the signal processing system and the room distribution system are connected in sequence. The room sub-system is connected to the second radio frequency switch of the 2.4GHz WiFi anti-interference adaptive trunk amplifier through the signal processing system; the WIFI base station is connected to the first power divider of the 2.4GHz WiFi anti-interference adaptive trunk amplifier through the radio frequency power distribution system.
本发明公开了一种含2.4GHz频段(例如指2400-2483MHz，下同)带外抑制的合路器，用于将放大后的WiFi 5GHz和2.4GHz频段的信号合路输出，其中2.4GHz频段输入端口应带有一定的带外信号抑制能力，为2.4GHz干放提供一定的抗干扰保护作用，以免因2.4GHz频段带外强干扰导致2.4GHz干放出现不稳定现象，因为2.4GHz干放的上行链路是宽频的，通常用于放大处理2.4GHz频段内的一个WiFi信道(一个2.4GHz WiFi信道的频宽一般为20MHz)信号。本发明公开了一种2.4GHzWiFi抗干扰自适应干放，主要解决干放能够自适应干扰强弱不同的环境，以及在强干扰的环境下，能够保持自身稳定的问题，不会因为在2400-2483MHz频段间部分频段有强干扰而出现射频开关反转、自激或失真饱和等问题。本发明公开了一种WiFi信道自适应系统，主要解决自动评估并引导WiFi基站选择最佳工作信道这个问题，从而自动适应干扰的变化，因为2.4GHz干扰在不同医院、不同病区、不同时间段，干扰的频段区间会有所不同。The invention discloses a combiner with out-of-band suppression in a 2.4GHz frequency band (for example, 2400-2483MHz, the same below), which is used to combine the amplified WiFi 5GHz and 2.4GHz frequency band signals for output, wherein the 2.4GHz frequency band The input port should have a certain out-of-band signal suppression capability to provide a certain anti-interference protection for the 2.4GHz dry amplifier, so as to avoid the instability of the 2.4GHz dry amplifier due to strong out-of-band interference in the 2.4GHz frequency band. The uplink is broadband and is usually used to amplify and process a WiFi channel in the 2.4GHz frequency band (the bandwidth of a 2.4GHz WiFi channel is generally 20MHz). The invention discloses a 2.4GHz WiFi anti-interference self-adaptive dry amplifier, which mainly solves the problem that the dry amplifier can adapt itself to environments with different interference strengths, and can maintain its own stability in a strong interference environment, and will not Some frequency bands between the 2483MHz frequency bands have strong interference and problems such as RF switch inversion, self-excitation or distortion saturation appear. The invention discloses a WiFi channel adaptive system, which mainly solves the problem of automatically evaluating and guiding the WiFi base station to select the best working channel, so as to automatically adapt to the change of interference, because 2.4GHz interference occurs in different hospitals, different wards and different time periods. , the frequency range of the interference will be different.
含2.4GHz频段带外抑制的合路器有两个输入端口和一个合路输出端口，其中一个输入端口的通带区间是5150-5850MHz，另一个输入端口的通带区间是2400-2483MHz，两个输入端口间相互隔离度越大越好，不过大于80dB应该是够了，其中2.4GHz频段输入端口在小于2390MHz和大于2515MHz的带外区间的抑制应大于20dB，以尽可能地保护2.4GHz干放不受2.4GHz WiFi频段带外的信号干扰影响。The combiner with out-of-band rejection in the 2.4GHz band has two input ports and one combined output port. The passband range of one input port is 5150-5850MHz, and the passband range of the other input port is 2400-2483MHz. The greater the mutual isolation between the two input ports, the better, but more than 80dB should be enough. The 2.4GHz frequency band input port should have a suppression of more than 20dB in the out-of-band range less than 2390MHz and greater than 2515MHz, so as to protect the 2.4GHz dry amplifier as much as possible. Unaffected by out-of-band signal interference in the 2.4GHz WiFi band.
自适应干放的默认工作模式是支持弱干扰环境的，这种情况下干放应该拥有较低的噪声系数和较高的上行增益，这样可以提高对上行弱信号的接收能力。同时干放的下行信号线性度也会保持在较高的水平，以满足下行高带宽的要求。本发明在干扰较强的情况下，干线放大器要自动下调上行增益以避免触发开关反转或信号饱和，同时可以也适当提高下行信号输出功率，适度下调下行信号的线性度，因为在强干扰的环境里，较高的线性度不如较高较强的有效信号功率管用。采用上述措施，目的是为了降低，较强的下行信号会改善下行信噪比，改善ping包延时，避免丢包或降低丢包率。如果干扰减退或消失，干放就要恢复到默认的上行增益和下行信号强度+线性度设置，保证在正常的工作环境中，获得最优带宽数据要逐步恢复到默认工作模式。The default working mode of the adaptive dry amplifier is to support the weak interference environment. In this case, the dry amplifier should have a lower noise figure and a higher uplink gain, which can improve the ability to receive weak uplink signals. At the same time, the linearity of the downlink signal of the dry release will also be kept at a high level to meet the requirement of high downlink bandwidth. In the present invention, in the case of strong interference, the trunk amplifier should automatically adjust the uplink gain to avoid trigger switch reversal or signal saturation, and at the same time, the output power of the downlink signal can also be appropriately increased, and the linearity of the downlink signal can be appropriately adjusted. In the environment, higher linearity is not as effective as higher and stronger effective signal power. The purpose of adopting the above measures is to reduce the strong downlink signal to improve the downlink signal-to-noise ratio, improve the ping packet delay, avoid packet loss or reduce the packet loss rate. If the interference decreases or disappears, the dry amplifier should return to the default uplink gain and downlink signal strength + linearity settings to ensure that in a normal working environment, the optimal bandwidth data should be gradually restored to the default working mode.
进一步说明：下行放大电路输出信号强度的自动控制如下：WiFi基站周期性地发射信标信号，信标信号的信号强度最强，且稳定，可以作为参考值来调整下行增益，保证下行输出信号的线性度。通常干放下行输出信号的线性度越高，输出功率越低，输出功率低又会影响信号的传输距离，因此需要找到一个平衡，这个平衡通常通过测试，作为输出控制电平预设参考值保存下来，用于实时比对。当干放在正常下行工作模式时，MCU通过运算放大器周期性地采样功率放大器的输出电平值，通过捕捉最大电平值与预设的电平参考值进行对比，如果超出，则加大第一可变衰减器的衰减值一个步进单位，反之，则减少一个步进单位，最终使得下行增益趋于稳定。Further description: The automatic control of the output signal strength of the downlink amplifier circuit is as follows: the WiFi base station periodically transmits the beacon signal, the signal strength of the beacon signal is the strongest and stable, and can be used as a reference value to adjust the downlink gain to ensure the downlink output signal. Linearity. Usually, the higher the linearity of the downstream output signal of the dry-down, the lower the output power, and the low output power will affect the transmission distance of the signal. Therefore, a balance needs to be found. This balance is usually tested and saved as the preset reference value of the output control level. down for real-time comparison. When it is in the normal downlink working mode, the MCU periodically samples the output level value of the power amplifier through the operational amplifier, and compares the maximum level value with the preset level reference value by capturing the maximum level value. The attenuation value of a variable attenuator is one step unit, otherwise, it is reduced by one step unit, and finally the downlink gain tends to be stable.
本发明提高了第一功率分配器的隔离度，提高干放稳定性，第一比较电路控制着射频开关的翻转，干线放大器抗干扰设计的重点就是防止上行信号造成开关翻转。如果第一检波器输出电平>第一参考电平，射频开关下行导通，上行关断。如果是下行信号触发了这个条件，则一切正常，如果是上行信号触发开关翻转成下行，则影响通信。因此在上下行链路射频增益足够的情况下，第一功率分配器可以采用耦合器，直通端连第一检波器，耦合端连射频开关，同时耦合器的反向隔离度设计值要尽可能高，这样才能最大限度地利用第一功率分配器来限制上行信号触发翻转射频开关。第一功率分配器也可以采用功分器结构。如果上下行链路射频增益不够高，第一功率分配器还是可以采用耦合器，但直通端应该连接射频开关，耦合端连接第一检波器。The invention improves the isolation degree of the first power divider and improves the stability of the dry discharge. The first comparison circuit controls the inversion of the radio frequency switch. If the output level of the first detector is greater than the first reference level, the radio frequency switch is turned on in the downward direction and turned off in the upward direction. If it is the downlink signal that triggers this condition, everything is normal, and if it is the uplink signal that triggers the switch to flip to downlink, it will affect the communication. Therefore, when the RF gain of the uplink and downlink is sufficient, the first power divider can use a coupler, the straight end is connected to the first detector, the coupling end is connected to the RF switch, and the design value of the reverse isolation of the coupler should be as far as possible. high, so as to maximize the use of the first power divider to limit the upstream signal from triggering the flipping of the RF switch. The first power divider may also adopt a power divider structure. If the radio frequency gain of the uplink and downlink is not high enough, the first power divider can still use a coupler, but the straight end should be connected to the radio frequency switch, and the coupling end should be connected to the first detector.
本发明动态设置下行开关翻转第一参考电平，保证干放能够正常工作实际使用中，WiFi信源的发射功率可能不同，干线放大器与WiFi信源之间的射频链路长短不一，衰减不同，因此到达干线放大器的输入端口的下行信号强度随实际部署情况而变，这导致第一参考电平的值比较难以选择，设置高了，则干线放大器拉远时可能无法触发。设置低了，则上行干扰就更容易造成射频开关翻转。解决这个问题的方法是利用WiFi信标信号在链路衰减固定的情况下，信号强度稳定，且是下行信号中的最强信号这个特点，在出厂前在没有干扰的环境里，在干线放大器满足最佳WiFi通信要求的情况下(即能够测得最佳无线数据带宽速率的情况下)，采集WiFi下行信标信号的第一检波器的输出值与最高第一参考电平之间的差值，并将该差值作为预设值保存作为后续参考。实际上电使用干线放大器时，干线放大器将在最初一段时间(自行定义，只要在这段时间里，能够开始接收WiFi信源信号)强制将射频开关置成下行，暂时关闭上行信号，捕捉并测量WiFi信标信号强度，减去预设的差值，作为第一参考电平的设置值即可。The present invention dynamically sets the downlink switch to flip the first reference level to ensure that the dry amplifier can work normally. In actual use, the transmit power of the WiFi signal source may be different, the length of the radio frequency link between the trunk amplifier and the WiFi signal source is different, and the attenuation is different , so the strength of the downlink signal reaching the input port of the trunk amplifier varies with the actual deployment situation, which makes it difficult to select the value of the first reference level. If it is set high, the trunk amplifier may not be triggered when it is extended. If the setting is low, the uplink interference is more likely to cause the RF switch to flip. The solution to this problem is to use the characteristics of the WiFi beacon signal that the signal strength is stable and the strongest signal in the downlink signal when the link attenuation is fixed. The difference between the output value of the first detector that collects the WiFi downlink beacon signal and the highest first reference level when the best WiFi communication requirements (that is, when the best wireless data bandwidth rate can be measured) , and save the difference as a preset value for subsequent reference. In fact, when the mains amplifier is used, the mains amplifier will force the RF switch to the downlink for the first period of time (defined by itself, as long as it can start to receive the WiFi source signal during this period of time), temporarily turn off the uplink signal, capture and measure The signal strength of the WiFi beacon, minus the preset difference, can be used as the setting value of the first reference level.
本发明动态设置第二参考电平，尽可能确保下行开关不会误翻转。上行信号经过第二检波器与第二参考电平对比，如果第二检波器输出电平>第二参考电平,触发MCU中断，MCU通过GPIO控制第二可变衰减器，增加一个单位的衰减值，直至达到最大衰减极限。第二参考电平与第一参考电平之间的差值是一个预设的固定值，这个差值在出厂前测量并保存。出厂前测量方法如下：屏蔽干线放大器输入端，在干线放大器输出端加载一个2.4GHz频段的上行参考信号，第二参考电平取一个很大的数值，保证上行信号不会触发中断，第一参考电平取一个正常值(只要能够保证WiFi正常通信)，加大上行参考信号功率，直至射频开关翻转，降低上行参考信号功率使它略低于造成射频开关翻转所需的上行信号功率，这时开始调低第二参考电平的数值，直到能够触发中断为止，将这时的第二参考电平-第一参考电平的差值最为预设的固定值加以保存，用于动态根据第一参考电平的值设置第二参考电平。The present invention dynamically sets the second reference level to ensure that the downlink switch does not turn over by mistake as much as possible. The uplink signal is compared with the second reference level through the second detector. If the output level of the second detector is greater than the second reference level, the MCU interrupt is triggered, and the MCU controls the second variable attenuator through GPIO to increase the attenuation by one unit. value until the maximum attenuation limit is reached. The difference between the second reference level and the first reference level is a preset fixed value, and the difference is measured and saved before leaving the factory. The measurement method before leaving the factory is as follows: shield the input end of the trunk amplifier, load an uplink reference signal in the 2.4GHz frequency band at the output end of the trunk amplifier, and take a large value for the second reference level to ensure that the uplink signal will not trigger interruption. Take a normal value (as long as the normal WiFi communication can be guaranteed), increase the power of the uplink reference signal until the RF switch flips, reduce the power of the uplink reference signal to make it slightly lower than the uplink signal power required to cause the flip of the radio frequency switch, and then start to adjust the power of the uplink reference signal. Lower the value of the second reference level until the interrupt can be triggered, and save the difference between the second reference level and the first reference level at the preset fixed value for dynamically according to the first reference level. A flat value sets the second reference level.
本发明适应不同干扰环境，为了尽可能不要因为强干扰而导致干放上行链路饱和，低噪放应尽可能选取1dB压缩点高，增益较小，噪声系数也较小的低噪放。推动级可以选择增益大、1dB压缩点高的芯片。这样可以使得干放可以同时适应强弱不同的干扰环境。The invention adapts to different interference environments. In order not to cause the dry amplifier uplink to be saturated due to strong interference as much as possible, the low noise amplifier should be selected as much as possible with a high 1dB compression point, a low gain and a low noise figure. The boost stage can choose a chip with large gain and a high 1dB compression point. In this way, the dry amplifier can adapt to different interference environments with different strengths at the same time.
本发明在必要时调整下行信号强度，当上行链路衰减器已经推到最大值时，可以适当调高下行自电平控制值，提高下行信号强度，牺牲一点线性度，因为在强干扰环境下，下行信号的强度比线性度更有用。The present invention adjusts the downlink signal strength when necessary. When the uplink attenuator has been pushed to the maximum value, the downlink self-level control value can be appropriately adjusted to improve the downlink signal strength and sacrifice a little linearity, because in the strong interference environment , the strength of the downstream signal is more useful than the linearity.
干扰消失，逐步恢复默认工作模式，在开关处于上行状态时，测量第二检波器的输出电平值，如果持续一段时间T均低于第二参考电平减去一个固定差值时，如果衰减器2的衰减值大于零，则调低一个单位，直至零为止。这种延时退出机制，能够让干放更好地适应干扰不稳定的环境，避免过度频繁操作衰减器而导致额外的信号干扰。The interference disappears, and the default working mode is gradually restored. When the switch is in the upstream state, the output level of the second detector is measured. If T is lower than the second reference level minus a fixed difference for a period of time, if the attenuation is If the attenuation value of device 2 is greater than zero, reduce it by one unit until it reaches zero. This delay exit mechanism can make the dry amplifier better adapt to the environment with unstable interference, and avoid excessive signal interference caused by excessive and frequent operation of the attenuator.
本发明还设置有WiFi信道自适应系统，2.4GHz WiFi在中国的工作频率区间为2400-2483MHz，共13个信道。室内信号分布系统在2.4GHz频段有强干扰的情况下，2.4GHzWiFi抗干扰自适应干线放大器虽然能够正常工作，但如果强干扰正好在WiFi基站的工作信道上，基站还是会受到很大的影响。由于日常2.4GHz干扰波动较大，且具体干扰的信道也会发生变化，基站虽然有一定干扰分析能力，但一般只是在开机时才会评估，且由于有前置2.4GHz干放，干扰分析会受到的存在，一定的程度上影响，造成了基站对干扰的分，判断容易出现错误，无法正确选择最佳信道，因此需要一个外部信道评估和选择的辅助系统。The present invention is also provided with a WiFi channel adaptive system, and the working frequency range of 2.4GHz WiFi in China is 2400-2483MHz, with a total of 13 channels. When the indoor signal distribution system has strong interference in the 2.4GHz frequency band, although the 2.4GHz WiFi anti-interference adaptive trunk amplifier can work normally, if the strong interference happens to be on the working channel of the WiFi base station, the base station will still be greatly affected. Since the daily 2.4GHz interference fluctuates greatly, and the specific interference channel will also change, although the base station has certain interference analysis capabilities, it is generally only evaluated when it is turned on. The existence of the interference, to a certain extent, has caused the base station to judge the interference, and the judgment is prone to errors, and it is impossible to correctly select the best channel. Therefore, an auxiliary system for external channel evaluation and selection is needed.
本WiFi信道自适应系统由主要两个部分组成，包括WiFi信道自适应评估终端(简称评估终端)和WiFi信道自适应控制器(简称控制器)。评估终端是一种带WiFi网卡的计算设备，可以是一台笔记本电脑、台式机、手机，或是一个定制化的嵌入式设备。在这个计算设备上运行一个定制化软件，周期性地执行下述WiFi信道扫描、评估和后端动态选择最佳WiFi信道的任务。控制器是一个服务端软件，可以独立运行在一台服务器上，或与其他系统共享服务器硬件设备。该服务端软件的功能包括配合评估终端的带宽测试指令，根据评估终端的指令，切换WiFi基站的2.4GHz工作信道，以及跟踪记录这些自适应信道调整。控制器与WiFi基站和评估终端间的连接必须遵循医院的安全策略。The WiFi channel adaptive system consists of two main parts, including a WiFi channel adaptive evaluation terminal (referred to as evaluation terminal) and a WiFi channel adaptive controller (referred to as a controller). The evaluation terminal is a computing device with a WiFi network card, which can be a laptop, desktop, mobile phone, or a customized embedded device. A custom software running on this computing device periodically performs the following tasks of WiFi channel scanning, evaluation, and dynamic selection of the best WiFi channel by the backend. The controller is a server-side software that can run independently on a server or share server hardware with other systems. The functions of the server software include cooperating with the bandwidth test command of the evaluation terminal, switching the 2.4GHz working channel of the WiFi base station according to the command of the evaluation terminal, and tracking and recording these adaptive channel adjustments. The connection between the controller and the WiFi base station and evaluation terminal must follow the hospital's security policy.
评估终端安装在室内信号分布系统所覆盖的区域的某个位置，通过2.4GHz WiFi工作信道经过正常认证连接上基站，与后端控制器建立安全的通信链接，用于评估WiFi链路通信质量。评估方法可以采用简单ping包或其他方式，根据预设的时间周期、ping包大小和个数，周期性地采集ping包平均延时和丢包率。后端控制器可以根据前端的指令切换基站的工作信道。前端评估终端将周期性测得的ping包平均延时和丢包率与预设的阈值进行比较，看是否需要触发新一轮13个信道的轮询评估过程，该轮询评估过程由评估终端控制，要求后端控制器逐一切换基站信道，逐一评估WiFi链路通信质量，根据评估结果，通知后端控制器将对应的WiFi基站的2.4GHz工作信道切换到最佳的信道上去。The evaluation terminal is installed at a certain position in the area covered by the indoor signal distribution system. It connects to the base station through the 2.4GHz WiFi working channel after normal authentication, and establishes a secure communication link with the back-end controller to evaluate the communication quality of the WiFi link. The evaluation method can use simple ping packets or other methods, and periodically collect the average delay and packet loss rate of ping packets according to the preset time period, size and number of ping packets. The back-end controller can switch the working channel of the base station according to the instruction of the front-end. The front-end evaluation terminal compares the periodically measured average delay and packet loss rate of ping packets with the preset thresholds to see if a new round of 13-channel polling evaluation process needs to be triggered. This polling evaluation process is performed by the evaluation terminal. Control requires the back-end controller to switch the base station channels one by one, evaluate the communication quality of the WiFi link one by one, and notify the back-end controller to switch the 2.4GHz working channel of the corresponding WiFi base station to the best channel according to the evaluation result.
以上对本发明的具体实施例进行了描述。需要理解的是，本发明并不局限于上述特定实施方式，本领域技术人员可以在权利要求的范围内做出各种变化或修改，这并不影响本发明的实质内容。在不冲突的情况下，本申请的实施例和实施例中的特征可以任意相互组合。Specific embodiments of the present invention have been described above. It should be understood that the present invention is not limited to the above-mentioned specific embodiments, and those skilled in the art can make various changes or modifications within the scope of the claims, which do not affect the essential content of the present invention. The embodiments of the present application and features in the embodiments may be combined with each other arbitrarily, provided that there is no conflict.
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