CN113726397A - Anti-interference self-adaptive trunk amplifier, system and signal processing system - Google Patents
Anti-interference self-adaptive trunk amplifier, system and signal processing system Download PDFInfo
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- CN113726397A CN113726397A CN202110977141.9A CN202110977141A CN113726397A CN 113726397 A CN113726397 A CN 113726397A CN 202110977141 A CN202110977141 A CN 202110977141A CN 113726397 A CN113726397 A CN 113726397A
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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
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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
- H04B7/15528—Control of operation parameters of a relay station to exploit the physical medium
- H04B7/15535—Control of relay amplifier gain
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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
- H04B7/15528—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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
- Y02D30/00—Reducing energy consumption in communication networks
- Y02D30/70—Reducing energy consumption in communication networks in wireless communication networks
Abstract
The invention provides an anti-interference self-adaptive trunk amplifier, a system and a signal processing system.A downlink amplification link comprises a first variable attenuator, a power amplifier and an operational amplifier, and a downlink signal is output after passing through a first power divider, a first radio frequency switch, the downlink amplification link and a second radio frequency switch in sequence; the first power divider is electrically connected with the first detector; the first comparison circuit judges the output level of the first detector and the first reference level and outputs a result to the switch control signal, and the switch control signal controls the first radio frequency switch and the second radio frequency switch and feeds back the first radio frequency switch and the second radio frequency switch to the control circuit; the control circuit adaptively sets a first reference level according to the strength of the base station beacon signal received by the first detector; the control circuit controls the first variable attenuator and the switch control signal. The invention realizes the anti-interference function. Switch turnover caused by uplink signals is avoided, and the automatic level control function is realized through the cooperation of the uplink amplification link and the downlink amplification link.
Description
Technical Field
The invention relates to the field of communication, in particular to an anti-interference self-adaptive trunk amplifier and an anti-interference self-adaptive trunk amplifier system, and more particularly to an anti-interference self-adaptive trunk amplifier, a signal processing system and an anti-interference self-adaptive system in a hospital.
Background
Electronic medical records have been developed for 15 years as the core of medical clinical informatization, and mobile ward-round and bedside care matched with the electronic medical records also become the most important wireless mobile application of hospitals. Nurses need to use the PDA to view and execute medical orders and perform the task of three-check seven pairs in daily nursing work. Since nurses are always performing orders on the move, the stability requirements on the wireless network are high. The coverage mode of the traditional WiFi wireless network is a multi-AP mode, but the mode can cause unstable phenomena such as bandwidth instability, virtual connection, packet loss and the like of the PDA in the moving process. In order to improve the stability of the WiFi wireless network, a hospital changes an indoor distribution system coverage mode, a base station is installed in a weak electricity room of a ward, and the unstable factors are removed from the principle. Due to the complex structure of ward areas, most of ward rooms are at the side of the walkway and in the washroom, which is not beneficial to the transmission of wireless signals, especially WiFi signals in the frequency band of 5GHz, so that the antennas of the indoor distribution system are required to enter each ward.
Under the condition that the indoor subsystem is not interfered by the outside, the indoor subsystem has the advantages of high stability, reliability, safety, maintainability and the like, but because the antenna coverage area is wide, the influence of other external interference sources is larger, especially in a 2.4GHz frequency band, a large number of disordered interference sources exist in hospitals, such as stray interference signals of a third party WiFi AP, a microwave oven, a microwave therapeutic apparatus, Bluetooth and Zigbee signals working in the 2.4GHz frequency band, private 2.4GHz signals and 4G/5G sideband (2390MHz and 2515MHz) of an operator, and the like, interference frequency bands and interference intensities of different hospitals, different disease areas and different time periods are possibly different, so that a plurality of self-adaptive technical schemes are needed to solve the challenges, and the wireless network system can be adjusted to the optimal state in different interference environments.
The common 2.4GHz frequency band dry amplifier uplink end is broadband and is easy to be interfered by strong force to cause unstable phenomena such as radio frequency switch reversal and even self-excitation, if a WiFi channel filter is added at the output end of the dry amplifier, the out-of-band interference can be reduced, the stability of the dry amplifier is improved, but the problem of in-band interference cannot be solved. Because the interference is unstable, when strong interference enters the in-band of the working WiFi channel, the only thing that can be done at this time is to change the working channel of the WiFi base station, however, because the dry amplifier output end has the WiFi channel filter of the corresponding channel, so to change the working channel of the WiFi base station will change the channel filter of the dry amplifier output end together at the same time, change into the WiFi channel filter of the corresponding new channel, this is very troublesome, need construction team to assist, very inflexible.
The utility model discloses a patent document is CN 201238301Y's utility model patent discloses a WLAN trunk amplifier for indoor coverage system's trunk signal is enlargied, and it includes radio frequency amplification module and synchronous control module, the radio frequency amplification module adopts time division multiplex mode, carries out low noise amplification to the input signal of uplink and handles, carries out power amplification to the input signal of downlink and handles, the radio frequency amplification module includes uplink low noise link and downlink power amplifier link, the synchronous control module includes coupler, the wave detector, comparison amplifier, the phase inverter. The utility model discloses the upper and lower chain circuit of WLAN trunk amplifier can realize automatic switch-over and automatic level control, and stable output power is convenient for engineering application and maintenance; the present WLAN trunk amplifier also enables gain adjustment. But the above scheme can not solve the problem of influence of strong interference on the stability of the power amplifier.
Disclosure of Invention
In view of the defects in the prior art, the present invention aims to provide a 2.4ghz wifi trunk amplifier and system.
The invention provides an anti-interference self-adaptive trunk amplifier, which comprises 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 radio frequency switch, wherein the downlink amplification link comprises a first variable attenuator, a power amplifier and an operational amplifier, and the anti-interference self-adaptive trunk amplifier comprises:
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;
the first power divider is electrically connected with the first detector;
the first comparison circuit judges the output level of the first detector and the first reference level and outputs a result to the switch control signal, and the switch control signal controls the first radio frequency switch and the second radio frequency switch and feeds back the first radio frequency switch and the second radio frequency switch to the control circuit;
the control circuit adaptively sets a first reference level according to the strength of the base station beacon signal received by the first detector;
the control circuit controls the first variable attenuator and the switch control signal.
Preferably, the apparatus further comprises a second detector, a second comparing circuit, and an uplink amplifying chain comprising a low noise amplifier, a second power splitter, a second variable attenuator, and a push stage amplifier, wherein:
the second radio frequency switch is electrically connected with 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 sequentially connected;
the second power divider, the second variable attenuator, the push stage amplifier and the first radio frequency switch are sequentially connected;
a control circuit controls the second variable attenuator and a second reference level.
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 signal attenuation of the second variable attenuator; if the output level of the second detector is not greater than the second reference level, the operation is not executed; and when the second radio frequency switch is in an uplink state, measuring the output level value of the second detector, and when the output level value is lower than the second reference level minus a fixed difference value for a period of time T, if the attenuation value of the second attenuator is greater than zero, reducing by one unit until zero.
Preferably, the difference between the second reference level and the first reference level is a predetermined fixed value.
Preferably, when the radio frequency gain of the downlink amplification link and the uplink amplification link reaches a set gain value, the first power divider adopts a coupler or a power divider;
and when the radio frequency gains of the downlink amplifying link and the uplink amplifying link do not reach the set gain value, the first power divider adopts a coupler.
Preferably, when the radio frequency gains of the downlink amplification link and the uplink amplification link reach a set gain value, and the first power divider adopts a coupler, the direct connection end of the coupler is connected with the first detector, and the coupling end of the coupler is connected with the first radio frequency switch;
when the radio frequency gains of the downlink amplification link and the uplink amplification link do not reach the set gain value, and the first power divider adopts the coupler, the coupling end of the coupler is connected with the first detector, and the straight-through end of the coupler is connected with the first radio frequency switch.
The signal processing system provided by the invention comprises a combiner and the anti-interference self-adaptive trunk amplifier, wherein the anti-interference self-adaptive trunk amplifier is electrically connected with the combiner.
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.
The anti-interference self-adaptive system provided by the invention comprises a WIFI base station, a radio frequency power distribution system, an indoor distribution system, a WIFI channel self-adaptive controller, a WIFI channel self-adaptive evaluation terminal and the signal processing system, wherein the signal processing system comprises:
the WIFI channel self-adaptive controller is in communication connection with the WIFI base station through a local area network and a floor switch in the hospital;
the WIFI channel self-adaptive evaluation terminal is in communication connection with the indoor distribution system;
the WIFI base station, the radio frequency power distribution system, the anti-interference self-adaptive trunk amplifier, the combiner and the indoor distribution system are sequentially connected.
Preferably, the indoor subsystem is connected with a second radio frequency switch of the anti-interference self-adaptive trunk amplifier through a signal processing system;
the WIFI base station is connected with a first power distributor of the anti-interference self-adaptive trunk amplifier through a radio frequency power distribution system.
Compared with the prior art, the invention has the following beneficial effects:
1. the anti-interference self-adaptive trunk amplifier is arranged, so that the anti-interference function of the 2.4GHz frequency band is realized.
2. The invention detects the beacon signal intensity of the base station in the starting stage through the trunk amplifier, and adaptively sets the first reference level, so that the trunk amplifier can adaptively adjust the uncertainty of the link attenuation between the trunk amplifier and the base station.
3. The invention dynamically sets the reference level and controls the variable attenuator through the control logic and the control circuit, thereby effectively avoiding the switch turnover caused by the uplink signal and further influencing the communication.
4. The invention is further provided with a downlink amplifying link, and the downlink amplifying link is matched with the uplink amplifying link to realize the function of dynamically and automatically controlling the downlink output level.
5. According to the invention, the optimal channel selection is realized through the WIFI channel self-adaptive controller and the WIFI channel self-adaptive evaluation terminal.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
fig. 1 is a schematic diagram of an ultra-wideband indoor signal distribution system in a hospital.
Fig. 2 is a hospital ward coverage illustration of an ultra-wideband indoor signal distribution system.
Fig. 3 is a schematic diagram of a 2.4ghz wifi anti-interference adaptive system.
Fig. 4 is a schematic diagram of a 2.4ghz wifi trunk amplifier.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that it would be obvious to those skilled in the art that various changes and modifications can be made without departing from the spirit of the invention. All falling within the scope of the present invention.
As shown in fig. 1 to 4, the 2.4ghz wifi anti-interference adaptive trunk amplifier provided in 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, a second radio frequency switch, a second detector, a second comparison circuit, and an uplink amplification link, where the downlink amplification link includes a first variable attenuator, a power amplifier, and an operational amplifier, and a downlink signal is output after passing through the first power divider, the first radio frequency switch, the downlink amplification 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 level of the first detector and the first reference level and outputs a result to the switch control signal, and the switch control signal controls the first radio frequency switch and the second radio frequency switch and feeds back the first radio frequency switch and the second radio frequency switch to the control circuit; the first reference level is an adaptive setting value; the control circuit controls the first variable attenuator and the switch control signal. The uplink amplification chain comprises a low noise amplifier, a second power divider, a second variable attenuator and a push-stage amplifier, wherein: the second radio frequency switch is electrically connected with 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 sequentially connected; the second power divider, the second variable attenuator, the push stage amplifier and the first radio frequency switch are sequentially connected; a control circuit controls the second variable attenuator. The second comparison circuit compares the second reference level with the output level of the second detector, and triggers the control circuit to interrupt if the output level of the second detector is greater than the second reference level. The difference between the second reference level and the first reference level is a predetermined fixed value.
Further, the first power divider includes a power divider or a coupler. When the radio frequency gain of the downlink amplification link and the radio frequency gain of the uplink amplification link reach a set gain value, the first power divider adopts a coupler or a power divider; and when the radio frequency gains of the downlink amplifying link and the uplink amplifying link do not reach the set gain value, the first power divider adopts a coupler. When the radio frequency gains of the downlink amplification link and the uplink amplification link reach a set gain value, when the first power divider adopts a coupler, the straight-through end of the coupler is connected with the first detector, and the coupling end of the coupler is connected with the first radio frequency switch; when the radio frequency gains of the downlink amplification link and the uplink amplification link do not reach the set gain value, and the first power divider adopts the coupler, the coupling end of the coupler is connected with the first detector, and the straight-through end of the coupler is connected with the first radio frequency switch.
The control system of the invention is an MCU, and can realize control functions, including functions of digital-to-analog conversion, analog-to-digital conversion, program interruption, instruction sending and the like. The specific MCU type is not limited herein.
The invention provides a signal processing system which comprises a combiner and the 2.4GHz WiFi trunk amplifier, wherein the 2.4GHz WiFi trunk amplifier is electrically connected with the combiner. The combiner comprises a 2.4GHz frequency band input port and a 5GHz frequency band input port, wherein the 2.4GHz frequency band input port is an anti-interference protected 2.4GHz frequency band input port.
The invention provides a 2.4GHzWiFi anti-interference self-adaptive system, which comprises a WIFI base station, a radio frequency power distribution system, a signal processing system, an indoor distribution system and the 2.4GHzWiFi anti-interference self-adaptive trunk amplifier, wherein: the WIFI base station, the radio frequency power distribution system, the 2.4GHzWiFi anti-interference self-adaptive trunk amplifier, the signal processing system and the indoor distribution system are sequentially connected. The indoor distribution system is connected with a second radio frequency switch of the 2.4GHzWiFi anti-interference self-adaptive trunk amplifier through the signal processing system; the WIFI base station is connected with a first power distributor of the 2.4GHzWiFi anti-interference self-adaptive trunk amplifier through a radio frequency power distribution system.
The invention discloses a combiner with 2.4GHz band (such as 2400 plus 2483MHz, the same below) out-of-band rejection, which is used for combining and outputting signals of amplified WiFi 5GHz and 2.4GHz bands, wherein an input port of the 2.4GHz band is required to have certain out-of-band signal rejection capability, so that a certain anti-interference protection effect is provided for 2.4GHz dry amplification, and the phenomenon of instability of 2.4GHz dry amplification caused by strong interference of the 2.4GHz band out-of-band is avoided, because an uplink of the 2.4GHz dry amplification is broadband, the combiner is usually used for amplifying and processing a WiFi channel (the bandwidth of a 2.4GHz WiFi channel is generally 20MHz) signal in the 2.4GHz band. The invention discloses a 2.4GHzWiFi anti-interference self-adaptive dry amplifier, which mainly solves the problems that the dry amplifier can self-adapt to environments with different interference strengths and can keep self stability in a strong interference environment, and the problems of radio frequency switch reversal, self excitation or distortion saturation and the like caused by strong interference in a frequency division section in the 2400 + 2483MHz frequency section can be solved. The invention discloses a WiFi channel self-adaptive system, which mainly solves the problem of automatically evaluating and guiding a WiFi base station to select an optimal working channel, thereby automatically adapting to the change of interference, because 2.4GHz interference is in different hospitals, different ward areas and different time periods, the frequency band interval of the interference is different.
The combiner with the 2.4GHz out-of-band rejection has two input ports and a combining output port, wherein the pass band interval of one input port is 5150 + 5850MHz, the pass band interval of the other input port is 2400 + 2483MHz, the larger the mutual isolation degree between the two input ports is, the better, but more than 80dB is enough, wherein the rejection of the 2.4GHz input port in the out-of-band interval smaller than 2390MHz and larger than 2515MHz is more than 20dB, so as to protect the 2.4GHz dry amplification from the influence of the out-of-band signal interference of the 2.4GHz WiFi band as much as possible.
The default working mode of the adaptive dry amplification is to support a weak interference environment, in which case the dry amplification should have a lower noise figure and a higher uplink gain, so that the receiving capability of the uplink weak signal can be improved. Meanwhile, the linearity of the downlink signal subjected to dry amplification can be kept at a higher level so as to meet the requirement of high downlink bandwidth. Under the condition of strong interference, the trunk amplifier automatically reduces the uplink gain to avoid the inversion of a trigger switch or signal saturation, and simultaneously can also properly improve the output power of downlink signals and properly reduce the linearity of the downlink signals, because the higher linearity is not used as the higher and stronger effective signal power in the environment of strong interference. The measures are adopted for reducing the problem that a stronger downlink signal can improve the downlink signal-to-noise ratio, improve the ping packet delay and avoid packet loss or reduce the packet loss rate. If the interference is reduced or disappeared, the dry amplification is required to be restored to the default uplink gain and downlink signal strength + linearity setting, and the optimal bandwidth data is required to be gradually restored to the default working mode in the normal working environment.
Further explanation is as follows: the automatic control of the output signal intensity of the downlink amplifying circuit is as follows: the WiFi base station periodically transmits beacon signals, the signal strength of the beacon signals is strongest and stable, downlink gain can be adjusted by using the beacon signals as reference values, and the linearity of downlink output signals is guaranteed. Generally, the higher the linearity of the output signal of the downlink is, the lower the output power is, and the lower the output power will affect the transmission distance of the signal, so a balance needs to be found, and the balance is usually tested and stored as a preset reference value of the output control level for real-time comparison. When the dry amplifier is in a normal downlink working mode, the MCU periodically samples the output level value of the power amplifier through the operational amplifier, compares the output level value with a preset level reference value by capturing the maximum level value, increases the attenuation value of the first variable attenuator by one step unit if the maximum level value exceeds the preset level reference value, and decreases the attenuation value by one step unit if the maximum level value exceeds the preset level reference value, so that the downlink gain tends to be stable finally.
The isolation degree of the first power divider is improved, the dry amplifier stability is improved, the first comparison circuit controls the turning of the radio frequency switch, and the anti-interference design of the main amplifier is mainly used for preventing the turning of the switch caused by an uplink signal. And if the output level of the first detector is greater than the first reference level, the radio frequency switch is turned on in a downlink mode and turned off in an uplink mode. If the downlink signal triggers the condition, all is normal, and if the uplink signal triggers the switch to be turned into downlink, the communication is influenced. Therefore, under the condition that the radio frequency gains of the uplink and the downlink are enough, the first power divider can adopt a coupler, the straight-through end is connected with the first detector, the coupling end is connected with the radio frequency switch, and meanwhile, the design value of the reverse isolation degree of the coupler is as high as possible, so that the first power divider can be utilized to limit the uplink signal to trigger and turn over the radio frequency switch to the maximum extent. The first power divider may also adopt a power divider structure. If the radio frequency gain of the uplink and the downlink is not high enough, the first power divider can still adopt a coupler, but the straight-through end is connected with the radio frequency switch, and the coupling end is connected with the first detector.
The downlink switch is dynamically set to turn over the first reference level, so that the fact that the trunk amplifier can normally work and is actually used is guaranteed, the transmitting power of WiFi information sources is possibly different, the radio frequency links between the trunk amplifier and the WiFi information sources are different in length and different in attenuation, the strength of downlink signals reaching the input port of the trunk amplifier is changed along with the actual deployment condition, the value of the first reference level is difficult to select, and if the setting is high, the trunk amplifier cannot be triggered when being pulled far. If the setting is low, the radio frequency switch is more easily turned over by uplink interference. The method for solving the problem is to utilize the characteristics that the WiFi beacon signal has stable signal strength and is the strongest signal in the downlink signal under the condition that the attenuation of a link is fixed, collect the difference value between the output value of the first detector of the WiFi downlink beacon signal and the highest first reference level in the non-interference environment before delivery under the condition that a trunk amplifier meets the optimal WiFi communication requirement (namely, under the condition that the optimal wireless data bandwidth rate can be measured), and store the difference value as a preset value as a subsequent reference. When the trunk amplifier is actually used electrically, the trunk amplifier forces the rf switch to be set to downlink for an initial period of time (which is self-defined as long as the WiFi source signal can start to be received during the period of time), temporarily turns off the uplink signal, captures and measures the WiFi beacon signal strength, and subtracts a preset difference value to be used as a setting value of the first reference level.
The invention dynamically sets the second reference level to ensure that the downlink switch cannot be turned over by mistake as far as possible. And the uplink signal is compared with a second reference level through a second detector, if the output level of the second detector is greater than the second reference level, the MCU is triggered to interrupt, and the MCU controls a second variable attenuator through the GPIO to increase the attenuation value of one unit 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 stored before leaving the factory. The pre-shipment measurement method comprises the following steps: shielding the input end of a trunk amplifier, loading an uplink reference signal of a 2.4GHz frequency band at the output end of the trunk amplifier, enabling a second reference level to take a large value to ensure that the uplink signal cannot trigger interruption, enabling a first reference level to take a normal value (as long as WiFi normal communication can be ensured), increasing the power of the uplink reference signal until a radio frequency switch is turned over, reducing the power of the uplink reference signal to be slightly lower than the power of the uplink signal required for turning over the radio frequency switch, starting to reduce the value of the second reference level until interruption can be triggered, and storing the difference value between the second reference level and the first reference level as a preset fixed value for dynamically setting the second reference level according to the value of the first reference level.
The invention is suitable for different interference environments, and in order to avoid uplink saturation of the dry amplifier caused by strong interference as far as possible, the low-noise amplifier which has the advantages of high compression point of 1dB, small gain and small noise coefficient is selected as far as possible. The boost stage may select a chip with a large gain and a high 1dB compression point. This makes it possible to adapt the dry amplification to interference environments with different strengths.
The 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 properly increased, the downlink signal strength is improved, and a little linearity is sacrificed, because the downlink signal strength is more useful than the linearity under the environment of strong interference.
And when the interference disappears, gradually recovering the default working mode, measuring the output level value of the second detector when the switch is in an uplink state, and if the attenuation value of the attenuator 2 is larger than zero and is reduced by one unit until the attenuation value is zero when the output level value is lower than the second reference level minus a fixed difference value for a period of time T. The time delay exit mechanism can enable the dry amplifier to better adapt to an environment with unstable interference, and avoids extra signal interference caused by excessively and frequently operating the attenuator.
The invention is also provided with a WiFi channel self-adaptive system, the 2.4GHz WiFi has working frequency interval of 2400 plus materials 2483MHz in China, and 13 channels are used in total. Under the condition that an indoor signal distribution system has strong interference in a 2.4GHz frequency band, although the 2.4GHz WiFi anti-interference self-adaptive trunk amplifier can normally work, if the strong interference is right on a working channel of a WiFi base station, the base station still can be greatly influenced. Because daily 2.4GHz interference has large fluctuation and a specific interference channel also changes, although a base station has certain interference analysis capability, the base station is generally evaluated only when the base station is started, and because the preposed 2.4GHz interference amplification exists, the interference analysis can be influenced to a certain extent, the interference is divided by the base station, errors easily occur in judgment, the optimal channel cannot be correctly selected, and therefore an auxiliary system for evaluating and selecting an external channel is needed.
The WiFi channel self-adaptive system is composed of two main parts, namely a WiFi channel self-adaptive evaluation terminal (evaluation terminal for short) and a WiFi channel self-adaptive controller (controller for short). The evaluation terminal is a computing device with a WiFi network card, and can be a notebook computer, a desktop computer, a mobile phone or a customized embedded device. A custom software is run on this computing device that periodically performs the tasks of WiFi channel scanning, evaluation, and back-end dynamic selection of the best WiFi channel as described below. The controller is server software, and can independently run on a server or share server hardware equipment with other systems. The function of the server software comprises the steps of matching with a bandwidth test instruction of the evaluation terminal, switching a 2.4GHz working channel of the WiFi base station according to the instruction of the evaluation terminal, and tracking and recording the adjustment of the self-adaptive channels. The connection between the controller and the WiFi base station and the evaluation terminal must follow the hospital's security policy.
The evaluation terminal is installed at a certain position of an area covered by the indoor signal distribution system, is connected with the base station through a 2.4GHz WiFi working channel after normal authentication, establishes a safe communication link with the rear-end controller and is used for evaluating the communication quality of the WiFi link. The evaluation method can adopt a simple ping packet or other modes, and periodically acquires the average ping packet delay and the packet loss rate according to a preset time period, the size and the number of the 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 ping packet delay and packet loss rate with preset threshold values to see whether a new round of polling evaluation process of 13 channels needs to be triggered, the polling evaluation process is controlled by the evaluation terminal, the back-end controller is required to switch base station channels one by one to evaluate the communication quality of the WiFi link one by one, and the back-end controller is informed to switch the 2.4GHz working channel of the corresponding WiFi base station to the optimal channel according to the evaluation result.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention. The embodiments and features of the embodiments of the present application may be combined with each other arbitrarily without conflict.
Claims (10)
1. An anti-interference adaptive trunk amplifier, comprising 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 radio frequency switch, wherein the downlink amplification link comprises a first variable attenuator, a power amplifier and an operational amplifier, wherein:
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;
the first power divider is electrically connected with the first detector;
the first comparison circuit judges the output level of the first detector and the first reference level and outputs a result to the switch control signal, and the switch control signal controls the first radio frequency switch and the second radio frequency switch and feeds back the first radio frequency switch and the second radio frequency switch to the control circuit;
the control circuit adaptively sets a first reference level according to the strength of the base station beacon signal received by the first detector;
the control circuit controls the first variable attenuator and the switch control signal.
2. The interference rejection adaptive trunk amplifier of claim 1, further comprising a second detector, a second comparison circuit, and an uplink amplification chain comprising a low noise amplifier, a second power splitter, a second variable attenuator, and a push stage amplifier, wherein:
the second radio frequency switch is electrically connected with 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 sequentially connected;
the second power divider, the second variable attenuator, the push stage amplifier and the first radio frequency switch are sequentially connected;
a control circuit controls the second variable attenuator and a second reference level.
3. The interference rejection adaptive trunk amplifier of claim 2, wherein said second comparator circuit compares a second reference level with the output level of said second detector, and if the output level of said second detector is greater than said second reference level, said second comparator circuit triggers said control circuit to interrupt, said control circuit controlling the attenuation of said second variable attenuator signal; if the output level of the second detector is not greater than the second reference level, the operation is not executed;
and when the second radio frequency switch is in an uplink state, measuring the output level value of the second detector, and when the output level value is lower than the second reference level minus a fixed difference value for a period of time T, if the attenuation value of the second attenuator is greater than zero, reducing by one unit until zero.
4. The interference rejection adaptive trunk amplifier of claim 3, wherein the difference between the second reference level and the first reference level is a predetermined fixed value.
5. The interference rejection adaptive trunk amplifier of claim 2,
when the radio frequency gain of the downlink amplification link and the radio frequency gain of the uplink amplification link reach a set gain value, the first power divider adopts a coupler or a power divider;
and when the radio frequency gains of the downlink amplifying link and the uplink amplifying link do not reach the set gain value, the first power divider adopts a coupler.
6. The interference rejection adaptive trunk amplifier of claim 5,
when the radio frequency gains of the downlink amplification link and the uplink amplification link reach a set gain value, when the first power divider adopts a coupler, the straight-through end of the coupler is connected with the first detector, and the coupling end of the coupler is connected with the first radio frequency switch;
when the radio frequency gains of the downlink amplification link and the uplink amplification link do not reach the set gain value, and the first power divider adopts the coupler, the coupling end of the coupler is connected with the first detector, and the straight-through end of the coupler is connected with the first radio frequency switch.
7. A signal processing system comprising a combiner and the tamper resistant adaptive trunk amplifier of any of claims 1-6, the tamper resistant adaptive trunk amplifier and the combiner being electrically connected.
8. The signal processing system of claim 7, wherein the combiner includes a 2.4GHz band input port and a 5GHz band input port, the 2.4GHz band input port being an anti-interference protected 2.4GHz band input port.
9. An anti-interference adaptive system, comprising a WIFI base station, a radio frequency power distribution system, an indoor distribution system, a WIFI channel adaptive controller, a WIFI channel adaptive evaluation terminal and the signal processing system of claim 7, wherein:
the WIFI channel self-adaptive controller is in communication connection with the WIFI base station through a local area network and a floor switch in the hospital;
the WIFI channel self-adaptive evaluation terminal is in communication connection with the indoor distribution system;
the WIFI base station, the radio frequency power distribution system, the anti-interference self-adaptive trunk amplifier, the combiner and the indoor distribution system are sequentially connected;
the WIFI channel self-adaptive evaluation terminal dynamically evaluates and selects a working channel;
and the WIFI channel self-adaptive controller switches the working channel according to the instruction of the WIFI channel self-adaptive evaluation terminal.
10. The adaptive immunity to interference adaptive adaptation system of claim 9,
the indoor distribution system is connected with a second radio frequency switch of the anti-interference self-adaptive trunk amplifier through the signal processing system;
the WIFI base station is connected with a first power distributor of the anti-interference self-adaptive trunk amplifier through a radio frequency power distribution system.
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