CN117833950B - A multi-frequency multi-channel communication system, alarm processing method and device - Google Patents
A multi-frequency multi-channel communication system, alarm processing method and device Download PDFInfo
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- CN117833950B CN117833950B CN202311874214.7A CN202311874214A CN117833950B CN 117833950 B CN117833950 B CN 117833950B CN 202311874214 A CN202311874214 A CN 202311874214A CN 117833950 B CN117833950 B CN 117833950B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
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Abstract
本发明公开了一种多频多路通信系统、告警处理方法及装置，所述多频多路通信系统包括：用于收发信号的天线、用于对不同频段的上行信号进行合路处理的上行模组以及用于对不同频段的下行信号进行合路处理的下行模组。本发明的上行模组与下行模组设有频段合路器，通过频段合路器可以根据不同运营商的网络频段分配，切换所需的通信频段切，换实现多频多路通信系统电路通道频段选择性、通道独立控制。
The present invention discloses a multi-frequency multi-channel communication system, an alarm processing method and a device, wherein the multi-frequency multi-channel communication system comprises: an antenna for transmitting and receiving signals, an uplink module for combining uplink signals of different frequency bands, and a downlink module for combining downlink signals of different frequency bands. The uplink module and the downlink module of the present invention are provided with a frequency band combiner, through which the required communication frequency band can be switched according to the network frequency band allocation of different operators, so as to realize the frequency band selectivity and channel independent control of the circuit channel of the multi-frequency multi-channel communication system.
Description
Technical Field
The present invention relates to the field of communications systems, and in particular, to a multi-frequency multi-path communications system, and an alarm processing method and apparatus.
Background
Along with development of science and technology, intelligent terminals and intelligent devices are gradually popularized, and the intelligent terminals can realize different application functions through interaction with a communication base station or a communication system, so that convenience is brought to life of people.
In order to make full use of communication channels, expand communication capacity, and reduce communication costs, many communication systems employ multiplexing, i.e., transmitting multiple pieces of information simultaneously on the same transmission path. The multiplexing is divided into frequency division, time division and code division multiplexing. In analog communication systems, the divided available frequency bands are allocated to individual information to share a common transmission medium, known as frequency division multiplexing. In a digital communication system, each message is assigned a time slot (short period of time) and each channel in turn occupies a time slot in turn, known as time division multiplexing. The code division multiplexing is to multiply each input signal with a certain code sequence waveform generated by an orthogonal code waveform generator at the transmitting end, and then add the multiplied signals to obtain a multi-channel signal.
The multiplexing communication system is characterized in that the operator builds different frequency band network coverage according to the network allocation frequency band, equipment with corresponding different frequency bands is needed, construction difficulty and construction cost are increased, and along with the increase of the frequency bands, a plurality of different antennas are needed to receive signals with different frequency bands, so that the whole communication system and a signal processing circuit are complex in structure, and meanwhile, the signals with different frequency bands are processed, interference is easy to generate, and further, the stability of communication is reduced.
Disclosure of Invention
The invention provides a multi-frequency multi-path communication system, an alarm processing method and a device, and the system can solve one or more technical problems.
The first aspect of the embodiment of the invention provides a multi-frequency multi-path communication system, which comprises an antenna for receiving and transmitting signals, an uplink module for carrying out combining processing on uplink signals of different frequency bands and a downlink module for carrying out combining processing on downlink signals of different frequency bands;
The uplink module comprises a plurality of uplink combining units, an uplink channel combiner, a first uplink attenuator, a first uplink radio frequency band amplifier and a first uplink frequency band combiner, wherein each uplink combining unit is respectively connected with the uplink channel combiner, and the uplink channel combiner, the first uplink attenuator, the first uplink radio frequency band amplifier and the first uplink frequency band combiner are sequentially connected;
The downlink module comprises a first downlink frequency band combiner, a downlink frequency band filter, a first downlink radio frequency band amplifier, a first downlink attenuator, a downlink channel combiner and a plurality of downlink combining units, wherein the first downlink frequency band combiner, the downlink frequency band filter, the first downlink radio frequency band amplifier, the first downlink attenuator and the downlink channel combiner are sequentially connected, and the downlink channel combiner is respectively connected with each downlink combining unit.
In a possible implementation manner of the first aspect, the uplink combining unit includes a second uplink frequency band combiner, an uplink frequency band filter, a second uplink radio frequency band amplifier and a second uplink attenuator, which are sequentially connected.
In a possible implementation manner of the first aspect, the uplink module further includes an uplink input detector and an uplink output detector;
The uplink input detector is connected with the second uplink radio frequency band amplifier;
the uplink output detector is connected with the first uplink radio frequency band amplifier.
In a possible implementation manner of the first aspect, the downlink combining unit includes a second downlink attenuator and a second downlink radio frequency band amplifier that are sequentially connected.
In a possible implementation manner of the first aspect, the downlink module further includes a downlink input detector and a downlink output detector;
The downlink input detector is connected with the first downlink radio frequency band amplifier;
The downlink output detector is connected with the second downlink radio frequency band amplifier.
In a possible implementation manner of the first aspect, the downlink module further includes a fault processing circuit and an alarm output circuit that are connected in sequence;
The fault processing circuit is connected with the downlink output detector.
A second aspect of an embodiment of the present invention provides an alarm processing method based on, for example, a multi-frequency multi-path communication system, the method including:
Before transmitting a downlink signal, acquiring a signal power value of the downlink signal;
If the signal power value is smaller than a first preset power threshold value, amplifying the downlink signal, and detecting the corresponding amplified power value after signal amplification;
And if the amplification power value is smaller than a second preset power threshold value, triggering alarm processing, wherein the first preset power threshold value and the second preset power threshold value are set according to the area of the area where the multi-frequency multi-channel communication system is located, and the first preset power threshold value is smaller than or equal to the second preset power threshold value.
A third aspect of an embodiment of the present invention provides an alarm processing apparatus based on a multi-frequency and multi-path communication system, the apparatus including:
The power acquisition module is used for acquiring a signal power value of a downlink signal before the downlink signal is transmitted;
the signal amplifying module is used for amplifying the downlink signal if the signal power value is smaller than a first preset power threshold value and detecting the corresponding amplified power value after the signal is amplified;
And the alarm processing module is used for triggering alarm processing if the amplification power value is smaller than a second preset power threshold, wherein the first preset power threshold and the second preset power threshold are set according to the area of the area where the multi-frequency and multi-channel communication system is located, and the first preset power threshold is smaller than or equal to the second preset power threshold.
Compared with the prior art, the multi-frequency multi-path communication system, the alarm processing method and the alarm processing device have the beneficial effects that the frequency band combiner is arranged on the uplink module and the downlink module, the required communication frequency band switching can be switched according to network frequency band distribution of different operators through the frequency band combiner, the channel frequency band selectivity and the channel independent control of the multi-frequency multi-path communication system are realized through switching, the signal power value of the downlink signal can be obtained before the downlink signal is sent, and if the signal is amplified, the signal power value is still smaller than the power threshold value, the alarm processing is triggered. The invention can prompt the user to process the area through the alarm processing so as to increase the communication base station and improve the stability of communication.
Drawings
Fig. 1 is a schematic structural diagram of a multi-frequency multi-path communication system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an uplink module according to an embodiment of the present invention;
Fig. 3 is a schematic structural diagram of an uplink combining unit according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a downlink module according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a downlink combining unit according to an embodiment of the present invention;
FIG. 6 is a flow chart of an alarm processing method based on a multi-frequency multi-path communication system according to an embodiment of the present invention;
Fig. 7 is a schematic structural diagram of an alarm processing device based on a multi-frequency multi-path communication system according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to solve the above problems, a multi-frequency and multi-channel communication system according to the embodiments of the present application will be described and illustrated in detail by the following specific examples.
Referring to fig. 1, a schematic structural diagram of a multi-frequency multi-path communication system according to an embodiment of the present invention is shown.
Wherein, as an example, the multi-frequency multi-path communication system may include:
The antenna is used for receiving and transmitting signals, the uplink module is used for carrying out combining processing on uplink signals of different frequency bands, and the downlink module is used for carrying out combining processing on downlink signals of different frequency bands.
Specifically, the antenna can be used for receiving and transmitting signals, and can specifically receive air interface signals, and is connected with an input port of the circuit device of the multi-frequency multi-channel communication system through a coaxial cable.
The uplink module can receive signals of the terminal in the coverage area, amplify the signals through a required frequency band, and finally send the signals to the base station through an antenna of an air interface of the equipment. The downlink module can be used for receiving air interface signals through the antenna, amplifying the signals through a required frequency band, and sending the signals to a coverage area through a coverage antenna of the equipment, and has the functions of automatic level control and gain self-adaptive control.
Referring to fig. 2-3, a schematic structural diagram of an uplink module according to an embodiment of the present invention and a schematic structural diagram of an uplink combining unit according to an embodiment of the present invention are shown respectively.
In an embodiment, the uplink module comprises a plurality of uplink combining units, an uplink channel combiner, a first uplink attenuator, a first uplink radio frequency band amplifier and a first uplink frequency band combiner, wherein each uplink combining unit is respectively connected with the uplink channel combiner, and the uplink channel combiner, the first uplink attenuator, the first uplink radio frequency band amplifier and the first uplink frequency band combiner are sequentially connected.
Referring to fig. 2-3, the uplink combining unit includes a second uplink frequency band combiner, an uplink frequency band filter, a second uplink radio frequency band amplifier, and a second uplink attenuator, which are sequentially connected.
Optionally, the uplink module further comprises an uplink input detector and an uplink output detector;
The uplink input detector is connected with the second uplink radio frequency band amplifier;
the uplink output detector is connected with the first uplink radio frequency band amplifier.
The uplink module can receive signals of the terminal of the coverage area, the radio frequency band filter amplifies the signals through a required frequency band and sends the signals to the base station through an air interface antenna of the equipment, and meanwhile, the uplink module also has automatic level control and does not influence the base station noise.
In addition, the band-pass filter passes through the required frequency band, is amplified by an amplifier, and outputs a detection signal by a detector, and is connected with a shunt control circuit. Each branching radio frequency channel is connected with an uplink public radio frequency channel through a combiner, signals are output through a public amplifier and a final amplifier, and a final detector outputs detection signals.
Referring to fig. 4-5, a schematic structural diagram of a downlink module according to an embodiment of the present invention and a schematic structural diagram of a downlink combining unit according to an embodiment of the present invention are shown respectively.
In an embodiment, the downlink module comprises a first downlink frequency band combiner, a downlink frequency band filter, a first downlink radio frequency band amplifier, a first downlink attenuator, a downlink channel combiner and a plurality of downlink combining units, wherein the first downlink frequency band combiner, the downlink frequency band filter, the first downlink radio frequency band amplifier, the first downlink attenuator and the downlink channel combiner are sequentially connected, and the downlink channel combiner is respectively connected with each downlink combining unit.
Referring to fig. 2-3, the downstream combining unit includes a second downstream attenuator and a second downstream radio frequency band amplifier connected in sequence.
Optionally, the downlink module further comprises a downlink input detector and a downlink output detector;
The downlink input detector is connected with the first downlink radio frequency band amplifier;
The downlink output detector is connected with the second downlink radio frequency band amplifier.
Optionally, the downlink module further comprises a fault processing circuit and an alarm output circuit which are connected in sequence;
The fault processing circuit is connected with the downlink output detector.
The downlink module receives the air interface signal, amplifies the signal through the required frequency band, sends the signal to the coverage area through the coverage antenna of the equipment, has the functions of automatic level control and gain self-adaptive control, can detect the power of the radio frequency signal through the power detection circuit, detects and amplifies the power to obtain the voltage quantity corresponding to the power level, and sends the voltage quantity to the monitoring circuit for processing, so that the repeater can output with rated power, and the equipment is protected from overheating and overload.
The invention also automatically adjusts the uplink and downlink gains of the repeater according to different application scenes, and adjusts the output noise level of the repeater to prevent interference to the base station and noise balance when the repeater is connected in series and parallel.
The band-pass filter of the downlink module is amplified by the amplifier through the required frequency band, and the public detector outputs a detection signal which is connected with the public control circuit. The downlink public radio frequency channel is connected with each branching radio frequency channel through a branching device, signals are output through each branching amplifier and a final amplifier, and the final detector outputs detection signals and is connected with the monitoring processing circuit and the alarm output circuit.
When a strong signal exists, power information is detected, corresponding voltage is output and sent to monitoring processing, the MCU obtains a corresponding power value according to the voltage information, and the link is adjusted according to the design requirement of the link, so that the power reaches the expected power of the link. When the installation isolation of the coverage system is insufficient, the equipment can give an alarm and turn off signals. And through the circuit, according to the network frequency band allocation of different operators, the required communication frequency band is switched, and the channel frequency band selectivity and the channel independent control of the multi-frequency multi-channel communication system are realized through the switching.
In addition, the uplink and the downlink of each channel of the whole system can also control the switching of different frequency bands, and each channel can be independently controlled to be opened or closed.
In the wireless coverage scene of offices, underground parking lots and the like, the public input port of the expansion unit is connected with the output port of the circuit equipment of the multi-frequency multi-channel communication system through the coaxial cable, and the plurality of remote coverage devices are connected with the branch output port of the expansion unit through the coaxial cable.
The access antenna is used as a signal source for wireless access of the system. The coverage antenna receives the equipment transmitting signal of the coverage area terminal, carries out equipment uplink frequency selection and amplification, and transmits the signal to the base station through the access antenna so as to realize interaction between the base station and the terminal.
In the embodiment of the invention, the uplink module and the downlink module are provided with the frequency band combiner, and the frequency band combiner can switch required communication frequency bands according to network frequency band allocation of different operators, so that the channel frequency band selectivity and the channel independent control of the multi-frequency multi-channel communication system are realized.
Referring to fig. 6, a flow chart of an alarm processing method based on a multi-frequency and multi-channel communication system according to an embodiment of the present invention is shown.
In an embodiment, the alarm processing method based on the multi-frequency multi-path communication system is applicable to the multi-frequency multi-path communication system described in the above embodiment.
The alarm processing method based on the multi-frequency multi-path communication system may include:
s11, before the downlink signal is sent, acquiring a signal power value of the downlink signal.
In one embodiment, an uplink signal may be received by an access antenna of a multi-frequency, multi-channel communication system, and after processing, may be converted into a downlink signal.
In order to ensure that the signal can be successfully received by the terminal and avoid communication interruption with the terminal, in one embodiment, before the downlink signal is sent, the power value of the downlink signal to be sent is obtained, and the signal power value is obtained.
And S12, if the signal power value is smaller than a first preset power threshold, amplifying the downlink signal, and detecting the corresponding amplified power value after signal amplification.
It may be determined whether the signal power value is smaller than a first preset power threshold, and if the signal power value is smaller than the first preset power threshold, it indicates that the signal power value is lower, the signal is worse, and communication of the terminal to be connected may be interrupted.
The signal amplification processing can be carried out on the downlink signal by utilizing the radio frequency band amplifier of the downlink module of the multi-frequency multi-path communication system, so that the power of the signal is improved.
In order to determine whether the amplified signal meets the communication requirement, a power value of the amplified signal may be obtained to obtain an amplified power value.
And S13, triggering alarm processing if the amplification power value is smaller than a second preset power threshold, wherein the first preset power threshold and the second preset power threshold are set according to the area of the area where the multi-frequency multi-channel communication system is located, and the first preset power threshold is smaller than or equal to the second preset power threshold.
In an embodiment, it may be determined whether the amplified power value is less than a second preset power threshold, and if the amplified power value is less than the second preset power threshold, indicating that the amplified signal is still unable to meet the communication requirement, an alarm circuit of the multi-frequency and multi-channel communication system may be invoked to trigger an alarm process, and in particular, may send an alarm signal or react to a communication interrupt process to the background.
Optionally, the alarm processing may also be information prompt processing, so as to promote the user to increase the communication base station in the area to meet the communication requirement, or adjust the power of the system, so that the signal meets the communication requirement.
In an embodiment, the first preset power threshold is less than or equal to the second preset power threshold.
The first preset power threshold and the second preset power threshold may be set according to an area of an area where the multi-frequency multi-path communication system is located.
In an embodiment, the multi-frequency multi-channel communication system may be provided with an ultrasonic sensor, and the ultrasonic sensor may send a detection pulse signal to the periphery, then receive a feedback pulse signal returned, and then detect the distance between the multi-frequency multi-channel communication system and the peripheral wall through the feedback pulse signal, so as to determine the area of the area where the multi-frequency multi-channel communication system is located according to the detected distance. And finally, setting a first preset power threshold value and a second preset power threshold value according to the area of the region.
In one implementation, the operation of detecting the distance may include the steps of:
Firstly, after obtaining a pulse signal to be sent, encoding the pulse signal to be sent into an encoding signal group according to a preset sequence.
And secondly, sending the coding signal group to the peripheral object by taking the multi-frequency multi-path communication system as the center, and obtaining the rebound signal group of the peripheral object after receiving the coding signal group.
And thirdly, determining the distance between the multi-frequency multi-path communication system and the surrounding objects based on the rebound signal group.
For the first step, the pulse signal is an ultrasonic signal transmitted by an ultrasonic sensor. The ultrasonic signals are edited in sequence, so that the ultrasonic signals can be distinguished from other signals, and the situation that other interference signals are adopted in subsequent detection is avoided, so that the distinguishing and anti-interference effects are realized.
Since the sensor may transmit pulse signals of various different frequencies to detect distances of different objects, in order to improve the processing efficiency of the multi-frequency signal, the following operations may be performed:
S21, dividing a pulse signal to be transmitted into a plurality of frequency division signals by using a preset frequency divider, wherein the frequencies of the plurality of frequency division signals are the same or different from one another.
Specifically, a pulse signal transmitted by the ultrasonic sensor may be acquired, the pulse signal may include a plurality of frequencies, the pulse signal may be sent to a frequency divider, and the pulse signal is divided into a plurality of divided signals by the frequency divider according to the size of the frequencies, and each divided signal corresponds to one frequency.
For example, divided into 5 divided signals, each divided signal being 100kHz, 200kHz, 300kHz, 400kHz and 500kHz, respectively.
S22, each frequency division signal is respectively encoded into a baseband code element with a preset sequence by adopting a preset FSK modulator, and a plurality of baseband code elements are obtained.
In actual operation, each frequency division signal can be input to the FSK modulator, the FSK modulator modulates each frequency division signal, and finally the FSK modulator can output corresponding baseband symbols according to the frequency of the frequency division signal, thereby obtaining a plurality of baseband symbols.
S23, combining a plurality of baseband code elements to form a coding signal group.
Then, several baseband symbols can be spliced and combined, and the spliced baseband symbols are added into the pulse signals to form corresponding coding signal groups.
For the second step, a bounces signal group is received. The ultrasonic sensor may be controlled to transmit the coded signal group to a surrounding object centered on the car.
In actual operation, it may be sent at intervals.
After receiving the coded signal group, the surrounding objects can reflect the coded signal group due to the own substance attribute, thereby forming a rebound signal.
Since the encoded signal constellation contains signals of a plurality of different frequencies, the different frequencies can be used to detect different objects. In actual operation, a plurality of different objects can rebound simultaneously after receiving signals with different frequencies, so that rebound signal groups can be formed. And the ultrasonic sensor can receive the rebound signal group of the rebound of the surrounding object.
For the third step, the distance between the multi-frequency multi-path communication system and the surrounding object is determined based on the rebound signal group.
The distance between the multi-frequency multi-path communication system and the surrounding object can be calculated by utilizing the rebound signal group so as to determine the distance between the multi-frequency multi-path communication system and the surrounding object, thereby determining the area of the area where the multi-frequency multi-path communication system is located.
In order to calculate the distance accurately, in an embodiment, the third step may comprise the sub-steps of:
s31, acquiring the sending time and the receiving time of the pulse.
In particular, the time of emission may be recorded when the encoded signal group is transmitted, and the time of reception may be recorded when the rebound signal group is acquired.
S32, calculating the distance between the multi-frequency multi-channel communication system and the surrounding object according to the sending time and the receiving time based on the TOF principle.
And calculating the distance between the multi-frequency and multi-channel communication system and the surrounding objects according to the sending time and the receiving time by using an ultrasonic flight time TOF calculation method.
After calculation, a plurality of distances can be obtained, the distance with the largest value can be selected from the plurality of distances, and then a circle area is calculated by taking the multi-frequency multi-path communication system as the circle center and taking the distance with the largest value as the radius, so as to obtain the area of the area.
And then setting a first preset power threshold value and a second preset power threshold value according to the size of the area.
The specific setting may be a proportional manner, for example, y=ax—x.
Where Y is the power threshold, A is a set constant, and X is the area of the region.
In this embodiment, the embodiment of the invention provides an alarm processing method based on a multi-frequency and multi-channel communication system, which has the beneficial effects that before a downlink signal is sent, a signal power value of the downlink signal is obtained, and if the signal is still smaller than a power threshold after being amplified, alarm processing is triggered. The invention can prompt the user to process the area through the alarm processing so as to increase the communication base station and improve the stability of communication.
The embodiment of the invention also provides an alarm processing device based on the multi-frequency and multi-channel communication system, and referring to fig. 7, a schematic structural diagram of the alarm processing device based on the multi-frequency and multi-channel communication system is shown.
Among them, as an example, the alarm processing apparatus based on the multi-frequency and multi-path communication system may include:
An acquisition power module 201, configured to acquire a signal power value of a downlink signal before transmitting the downlink signal;
A signal amplifying module 202, configured to amplify the downlink signal if the signal power value is less than a first preset power threshold, and detect an amplified power value corresponding to the amplified signal;
And the alarm processing module 203 is configured to trigger alarm processing if the amplification power value is smaller than a second preset power threshold, where the first preset power threshold and the second preset power threshold are set according to an area of an area where the multi-frequency and multi-channel communication system is located, and the first preset power threshold is smaller than or equal to the second preset power threshold.
It will be clearly understood by those skilled in the art that, for convenience and brevity, the specific working process of the apparatus described above may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
Further, the embodiment of the application also provides electronic equipment, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, wherein the processor realizes the alarm processing method based on the multi-frequency and multi-channel communication system according to the embodiment when executing the program.
Further, an embodiment of the present application also provides a computer-readable storage medium storing computer-executable instructions for causing a computer to perform the alarm processing method based on the multi-frequency and multi-channel communication system according to the above embodiment.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that changes and modifications may be made without departing from the principles of the invention, such changes and modifications are also intended to be within the scope of the invention.
Claims (9)
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| CN101583210A (en) * | 2009-04-08 | 2009-11-18 | 深圳市信特科技有限公司 | Multi-frequency band self-excited interference elimination repeater |
| CN106357310B (en) * | 2016-09-14 | 2023-05-12 | 京信网络系统股份有限公司 | Multiple input multiple output signal transmission method and system |
| CN214154455U (en) * | 2020-12-29 | 2021-09-07 | 西安西域美唐电竞科技有限公司 | Multi-frequency combiner |
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| CN202261182U (en) * | 2011-09-06 | 2012-05-30 | 武汉凡谷电子技术股份有限公司 | RF AGC circuit |
| CN109274381A (en) * | 2018-11-12 | 2019-01-25 | 北京航天控制仪器研究所 | A kind of multi-frequency band mobile communication radio frequency transceiver |
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