CN104301020A - Microwave self-adaptation communication device - Google Patents
Microwave self-adaptation communication device Download PDFInfo
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- CN104301020A CN104301020A CN201410572927.2A CN201410572927A CN104301020A CN 104301020 A CN104301020 A CN 104301020A CN 201410572927 A CN201410572927 A CN 201410572927A CN 104301020 A CN104301020 A CN 104301020A
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- 238000004891 communication Methods 0.000 title claims abstract description 14
- 230000005540 biological transmission Effects 0.000 claims description 29
- 230000008878 coupling Effects 0.000 claims description 27
- 238000010168 coupling process Methods 0.000 claims description 27
- 238000005859 coupling reaction Methods 0.000 claims description 27
- 238000005562 fading Methods 0.000 claims description 22
- 230000003044 adaptive effect Effects 0.000 claims description 4
- 238000001514 detection method Methods 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000010276 construction Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000001914 filtration Methods 0.000 description 3
- 238000010295 mobile communication Methods 0.000 description 3
- 230000008054 signal transmission Effects 0.000 description 3
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/0004—Modulated-carrier systems using wavelets
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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
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Abstract
The invention relates to a microwave self-adaptation communication device. The device can be arranged flexibly, cannot be limited by regions and environments and can effectively extend the coverage distance of a base station under the condition that normal operation of the base station is not affected. The microwave self-adaption communication device has excellent coverage capacity, signals can be transmitted stably, the device cannot be affected by interference easily, and the communication reliability is high.
Description
Technical Field
The invention relates to the field of microwave communication, in particular to a microwave self-adaptive communication device.
Background
In recent years, the mobile communication business has been rapidly developed in China, and mobile communication networks have basically covered the whole country. However, in order to construct a high-quality mobile communication coverage network, coverage of a base station shadow area needs to be performed. The repeater device is good equipment for covering blind areas due to small investment, stable performance, high station building speed, low requirement on environment and simple and convenient installation and maintenance.
In the past, including base station and repeater construction, transmission modes include optical fibers, coaxial lines and the like, but when the transmission modes face to preferential transmission resources which are in short supply in certain areas, the flexibility of repeater networking is limited, and the defects of high equipment cost, complex engineering construction, high property coordination difficulty and the like exist. Microwave has been widely used in large network construction as a transmission mode with relatively low cost and easy station construction.
However, the current microwave communication is greatly influenced by environment and transmission distance, and the device performance, capacity, compatibility and coverage are not high, so that a more efficient microwave repeater needs to be designed.
Disclosure of Invention
The purpose of the invention is realized by the following technical scheme.
According to an embodiment of the present invention, a microwave adaptive communication apparatus is provided, the apparatus including:
the system comprises a microwave transmission unit, a channel fading loss compensation unit, a first forwarding coupling component unit, a first forwarding microwave modulation and demodulation unit, a first forwarding intermediate frequency unit, a first forwarding power source unit, a first forwarding control unit, a covering antenna, a second forwarding intermediate frequency unit, a second forwarding microwave modulation and demodulation unit, a second forwarding coupling component unit, a second forwarding power source unit and a second forwarding control unit; wherein,
the microwave transmission unit is connected with the covering antenna sequentially through the channel fading loss compensation unit, the first transmitting coupling component unit, the first transmitting microwave modulation and demodulation unit, the first transmitting intermediate frequency unit and the first transmitting frequency unit; the microwave transmission unit is used for sending or receiving the microwave signals and performing spatial transmission of the microwave signals, the channel fading loss compensation unit is used for simultaneously receiving the microwave signals forwarded by the plurality of microwave forwarding units and simultaneously performing multi-path processing to realize compensation of multi-path channel fading loss, and the first forwarding microwave modulation and demodulation unit is used for combining forward data signals and clock signals received from the base station into forwarding service information or performing reverse shunt processing; the first transmitting microwave modulation and demodulation unit is used for converting microwave signals and intermediate frequency signals, the first transmitting intermediate frequency unit is used for converting radio frequency and intermediate frequency, and the first transmitting frequency unit is used for covering radio frequency signals;
the first transmitting and receiving power source unit is respectively connected with the microwave transmission unit, the channel fading loss compensation unit, the first transmitting and coupling component unit, the first transmitting microwave modulation and demodulation unit, the first transmitting intermediate frequency unit and the first transmitting and receiving frequency unit and is used for supplying power to the units;
the first forwarding control unit is respectively connected with the microwave transmission unit, the channel fading loss compensation unit, the first forwarding coupling component unit, the first forwarding microwave modulation and demodulation unit, the first forwarding intermediate frequency unit and the first forwarding frequency unit, and is configured to control the units;
the second forwarding intermediate frequency unit is connected with the second forwarding coupling component unit through the second forwarding microwave modem unit, the second forwarding intermediate frequency unit is used for receiving the radio frequency signal sent by the first forwarding intermediate frequency unit and performing radio frequency and intermediate frequency conversion, the second forwarding microwave modem unit is used for converting the microwave signal and the intermediate frequency signal, and the second forwarding coupling component unit is used for combining a reverse data signal and a clock signal received from a terminal into forwarding service information or executing forward shunt processing;
the second forwarding power supply unit is respectively connected with the second forwarding intermediate frequency unit, the second forwarding microwave modulation and demodulation unit and the second forwarding coupling component unit and is used for supplying power to the units;
the second forwarding control unit is respectively connected with the second forwarding intermediate frequency unit, the second forwarding microwave modulation and demodulation unit and the second forwarding coupling component unit, and is used for controlling the units.
According to an embodiment of the present invention, the microwave transmission unit includes an analog-to-digital/digital-to-analog converter, an automatic gain amplifier, and a digital microwave transceiving unit, the analog-to-digital/digital-to-analog converter converts an analog microwave signal to be transmitted into a digital microwave signal or converts a received digital microwave signal into an analog microwave signal, the automatic gain amplifier is configured to gain-amplify the digital microwave signal to be transmitted, and the digital microwave transceiving unit is configured to transceive the digital microwave signal.
According to a preferred embodiment of the present invention, the channel fading loss compensation unit specifically includes a first mixer, a first interpolation unit, a first digitally controlled oscillator, a first secondary phase-locked loop unit, a second digitally controlled oscillator, a filter, a timing offset obtaining unit, a multiplexing unit, a second mixer, a second interpolation unit, a third digitally controlled oscillator, a second secondary phase-locked loop unit, a first frequency adjustor and a second frequency adjustor;
a first input port of the first frequency mixer is connected with an external first multi-path branch, and a second output port of the first frequency mixer is respectively connected with a first input port of the first interpolation unit and a first input port of the first secondary phase-locked loop unit; the second output port of the first secondary phase-locked loop unit is connected with the third input port of the first numerical control oscillator; a first output port and a second output port of the first numerically controlled oscillator are respectively connected with a third input port and a fourth input port of the first mixer one by one; a first input port of the second frequency mixer is connected with an external second multi-path branch, and a second output port of the second frequency mixer is respectively connected with a first input port of the second interpolation unit and a first input port of the second secondary phase-locked loop unit; a second output port of the second secondary phase-locked loop unit is connected with a third input port of a third numerically controlled oscillator; a first output port and a second output port of the third numerically controlled oscillator are respectively connected with a third input port and a fourth input port of the second mixer one by one; the second output port of the first interpolation unit is connected with the first input port of the first frequency regulator; a second output port of the first frequency regulator is connected with a first input port of the timing deviation acquisition unit; a second output port of the second interpolation unit is connected with a first input port of the second frequency regulator; a second output port of the second frequency regulator is connected with a second input port of the timing deviation acquisition unit; a third output port of the timing deviation acquisition unit is connected with a second input port of the filter; the first output port of the filter is connected with the third input port of the second numerically controlled oscillator; a first output port of the second numerically controlled oscillator is connected with a third input port of the first interpolation unit; a second output port of the second numerically controlled oscillator is connected with a third input port of the second interpolation unit; a third output port of the first frequency regulator is connected with a first input port of the multi-path merging unit; a third output port of the second frequency regulator is connected with a second input port of the multi-path merging unit; and a third output port of the multi-path merging unit is connected with an external detection signal output.
The microwave self-adaptive communication device can be flexibly arranged, is not limited by regions and environments, can effectively extend the coverage distance of the base station under the condition of ensuring that the normal work of the base station is not influenced, has excellent coverage capability, can stably transmit signals, is not easily influenced by interference, and has high communication reliability.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
FIG. 1 is a schematic diagram of a microwave adaptive communication device according to an embodiment of the present invention;
fig. 2 is a schematic structural view illustrating a microwave transmission unit according to an embodiment of the present invention;
fig. 3 is a schematic diagram illustrating a channel fading loss compensation unit according to an embodiment of the present invention;
FIG. 4 shows a schematic diagram of a first frequency adjustor, according to an embodiment of the invention;
fig. 5 shows a schematic diagram of an automatic gain amplifier according to an embodiment of the invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
According to an embodiment of the present invention, a microwave adaptive communication apparatus is provided, as shown in fig. 1, the apparatus includes: the system comprises a microwave transmission unit, a channel fading loss compensation unit, a first forwarding coupling component unit, a first forwarding microwave modulation and demodulation unit, a first forwarding intermediate frequency unit, a first forwarding power source unit, a first forwarding control unit, a covering antenna, a second forwarding intermediate frequency unit, a second forwarding microwave modulation and demodulation unit, a second forwarding coupling component unit, a second forwarding power source unit and a second forwarding control unit; wherein,
the microwave transmission unit is connected with the covering antenna sequentially through the channel fading loss compensation unit, the first transmitting coupling component unit, the first transmitting microwave modulation and demodulation unit, the first transmitting intermediate frequency unit and the first transmitting frequency unit; the microwave transmission unit is used for sending or receiving the microwave signals and performing spatial transmission of the microwave signals, the channel fading loss compensation unit is used for simultaneously receiving the microwave signals forwarded by the plurality of microwave forwarding units and simultaneously performing multi-path processing to realize compensation of multi-path channel fading loss, and the first forwarding microwave modulation and demodulation unit is used for combining forward data signals and clock signals received from the base station into forwarding service information or performing reverse shunt processing; the first transmitting microwave modulation and demodulation unit is used for converting microwave signals and intermediate frequency signals, the first transmitting intermediate frequency unit is used for converting radio frequency and intermediate frequency, and the first transmitting frequency unit is used for covering radio frequency signals;
the first transmitting and receiving power source unit is respectively connected with the microwave transmission unit, the channel fading loss compensation unit, the first transmitting and coupling component unit, the first transmitting microwave modulation and demodulation unit, the first transmitting intermediate frequency unit and the first transmitting and receiving frequency unit and is used for supplying power to the units;
the first forwarding control unit is respectively connected with the microwave transmission unit, the channel fading loss compensation unit, the first forwarding coupling component unit, the first forwarding microwave modulation and demodulation unit, the first forwarding intermediate frequency unit and the first forwarding frequency unit, and is configured to control the units;
the second forwarding intermediate frequency unit is connected with the second forwarding coupling component unit through the second forwarding microwave modem unit, the second forwarding intermediate frequency unit is used for receiving the radio frequency signal sent by the first forwarding intermediate frequency unit and performing radio frequency and intermediate frequency conversion, the second forwarding microwave modem unit is used for converting the microwave signal and the intermediate frequency signal, and the second forwarding coupling component unit is used for combining a reverse data signal and a clock signal received from a terminal into forwarding service information or executing forward shunt processing;
the second forwarding power supply unit is respectively connected with the second forwarding intermediate frequency unit, the second forwarding microwave modulation and demodulation unit and the second forwarding coupling component unit and is used for supplying power to the units;
the second forwarding control unit is respectively connected with the second forwarding intermediate frequency unit, the second forwarding microwave modulation and demodulation unit and the second forwarding coupling component unit, and is used for controlling the units.
According to an embodiment of the present invention, as shown in fig. 2, the microwave transmission unit includes an analog-to-digital/digital-to-analog converter, an automatic gain amplifier, and a digital microwave transceiving unit, wherein the analog-to-digital-to-analog converter converts an analog microwave signal to be transmitted into a digital microwave signal or converts a received digital microwave signal into an analog microwave signal, the automatic gain amplifier is configured to gain-amplify the digital microwave signal to be transmitted, and the digital microwave transceiving unit is configured to transceive the digital microwave signal. Different from the analog microwave signal transmission in the prior art, the microwave transmission unit of the invention adopts digital microwave signal transmission, thereby greatly reducing the defect that the analog signal transmission is greatly influenced by the environment, and the microwave signal transmitted is stronger through the design of the automatic gain amplifier, thereby obviously improving the capacity and the coverage distance of the device.
According to a preferred embodiment of the present invention, as shown in fig. 3, the channel fading loss compensation unit specifically includes a first mixer, a first interpolation unit, a first numerically controlled oscillator, a first secondary phase-locked loop unit, a second numerically controlled oscillator, a filter, a timing offset obtaining unit, a multiplexing combining unit, a second mixer, a second interpolation unit, a third numerically controlled oscillator, a second secondary phase-locked loop unit, a first frequency adjustor and a second frequency adjustor;
as an example, the present invention selects two multi-path branches, which correspond to the branches transmitted by two microwave forwarding units, respectively, but those skilled in the art will understand that the present invention is not limited to two branches;
a first input port of the first frequency mixer is connected with an external first multi-path branch, and a second output port of the first frequency mixer is respectively connected with a first input port of the first interpolation unit and a first input port of the first secondary phase-locked loop unit; the second output port of the first secondary phase-locked loop unit is connected with the third input port of the first numerical control oscillator; a first output port and a second output port of the first numerically controlled oscillator are respectively connected with a third input port and a fourth input port of the first mixer one by one; a first input port of the second frequency mixer is connected with an external second multi-path branch, and a second output port of the second frequency mixer is respectively connected with a first input port of the second interpolation unit and a first input port of the second secondary phase-locked loop unit; a second output port of the second secondary phase-locked loop unit is connected with a third input port of a third numerically controlled oscillator; a first output port and a second output port of the third numerically controlled oscillator are respectively connected with a third input port and a fourth input port of the second mixer one by one; the second output port of the first interpolation unit is connected with the first input port of the first frequency regulator; a second output port of the first frequency regulator is connected with a first input port of the timing deviation acquisition unit; a second output port of the second interpolation unit is connected with a first input port of the second frequency regulator; a second output port of the second frequency regulator is connected with a second input port of the timing deviation acquisition unit; a third output port of the timing deviation acquisition unit is connected with a second input port of the filter; the first output port of the filter is connected with the third input port of the second numerically controlled oscillator; a first output port of the second numerically controlled oscillator is connected with a third input port of the first interpolation unit; a second output port of the second numerically controlled oscillator is connected with a third input port of the second interpolation unit; a third output port of the first frequency regulator is connected with a first input port of the multi-path merging unit; a third output port of the second frequency regulator is connected with a second input port of the multi-path merging unit; and a third output port of the multi-path merging unit is connected with an external detection signal output.
As shown in fig. 4, the first frequency adjuster (the second frequency adjuster has the same structure) is composed of a feed-forward filter, a tap weighting module, an adder, a quantizer, a subtracter, a feedback tap module, a feedback filter and a decision output module; wherein the second output port of the interpolator is connected to the first input port of the feedforward filter; the second output port of the feedforward filter is connected with the first input port of the adder; a third output port of the feedforward filter is connected with a first input port of the tap weighting module; a fourth input port of the feedforward filter is connected with a second output port of the tap weighting module; a third input port of the tap weighting module is connected with a first output port of the subtracter; a third input port of the adder is connected with a third output port of the feedback filter; the second output port of the adder is connected with the first input port of the quantizer; the second output port of the quantizer is connected with the first input port of the judgment output module; the second input port of the subtracter is connected with the second output port of the quantizer; the third input port of the subtracter is connected with the second output port of the adder; a first output port of the feedback tap module is connected with a first input port of the feedback filter; a second input port of the feedback tap module is connected with a second output port of the feedback filter; a third input port of the feedback tap module is connected with a first output port of the subtracter; a fourth input port of the feedback filter is connected with a second output port of the quantizer; and a second output port of the judgment output module is connected with an input port of the multi-path merging unit.
According to a preferred embodiment of the present invention, as shown in fig. 5, the automatic gain amplifier of the microwave transmission unit specifically includes: the device comprises a primary intermediate frequency filter, a primary variable gain amplifier, a secondary intermediate frequency filter, a secondary mixer unit, a low-pass filter and a secondary variable gain amplifier; the first-stage intermediate frequency filter performs band-pass filtering processing on the high-intermediate frequency signal sent by the first-stage mixer unit, and sends the processed signal to the first-stage variable gain amplifier; the first-stage variable gain amplifier is used for carrying out power amplification processing on the signal sent by the first-stage intermediate frequency filter, and the amplified signal is sent to the second-stage intermediate frequency filter; the second-stage intermediate frequency filter performs band-pass filtering processing on the signal sent by the first-stage variable gain amplifier, and sends the processed signal to a second-stage mixer unit; the secondary mixer unit mixes the signal filtered by the secondary intermediate frequency filter with an intermediate frequency local oscillator signal to obtain a low intermediate frequency signal and sends the low intermediate frequency signal to a low-pass filter; the low-pass filter performs low-pass filtering processing on the low-intermediate frequency signal sent by the secondary mixer unit, and sends the processed signal to a secondary variable gain amplifier; the signal from the low-pass filter is amplified by the second-stage variable gain amplifier and then sent to the outside for further processing, wherein the signal output by the second-stage variable gain amplifier can be detected by the power of the signal, and the signal obtained by detection is fed back to the gain control ports of the second-stage variable gain amplifier and the first-stage variable gain amplifier, so that the two-stage variable gain amplifier and the first-stage variable gain amplifier have variable gains according to the magnitude of the intermediate frequency signal.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A microwave adaptive communication device, the device comprising: the system comprises a microwave transmission unit, a channel fading loss compensation unit, a first forwarding coupling component unit, a first forwarding microwave modulation and demodulation unit, a first forwarding intermediate frequency unit, a first forwarding power source unit, a first forwarding control unit, a covering antenna, a second forwarding intermediate frequency unit, a second forwarding microwave modulation and demodulation unit, a second forwarding coupling component unit, a second forwarding power source unit and a second forwarding control unit; wherein,
the microwave transmission unit is connected with the covering antenna sequentially through the channel fading loss compensation unit, the first transmitting coupling component unit, the first transmitting microwave modulation and demodulation unit, the first transmitting intermediate frequency unit and the first transmitting frequency unit; the microwave transmission unit is used for sending or receiving the microwave signals and performing spatial transmission of the microwave signals, the channel fading loss compensation unit is used for simultaneously receiving the microwave signals forwarded by the plurality of microwave forwarding units and simultaneously performing multi-path processing to realize compensation of multi-path channel fading loss, and the first forwarding microwave modulation and demodulation unit is used for combining forward data signals and clock signals received from the base station into forwarding service information or performing reverse shunt processing; the first transmitting microwave modulation and demodulation unit is used for converting microwave signals and intermediate frequency signals, the first transmitting intermediate frequency unit is used for converting radio frequency and intermediate frequency, and the first transmitting frequency unit is used for covering radio frequency signals;
the first transmitting and receiving power source unit is respectively connected with the microwave transmission unit, the channel fading loss compensation unit, the first transmitting and coupling component unit, the first transmitting microwave modulation and demodulation unit, the first transmitting intermediate frequency unit and the first transmitting and receiving frequency unit and is used for supplying power to the units;
the first forwarding control unit is respectively connected with the microwave transmission unit, the channel fading loss compensation unit, the first forwarding coupling component unit, the first forwarding microwave modulation and demodulation unit, the first forwarding intermediate frequency unit and the first forwarding frequency unit, and is configured to control the units;
the second forwarding intermediate frequency unit is connected with the second forwarding coupling component unit through the second forwarding microwave modem unit, the second forwarding intermediate frequency unit is used for receiving the radio frequency signal sent by the first forwarding intermediate frequency unit and performing radio frequency and intermediate frequency conversion, the second forwarding microwave modem unit is used for converting the microwave signal and the intermediate frequency signal, and the second forwarding coupling component unit is used for combining a reverse data signal and a clock signal received from a terminal into forwarding service information or executing forward shunt processing;
the second forwarding power supply unit is respectively connected with the second forwarding intermediate frequency unit, the second forwarding microwave modulation and demodulation unit and the second forwarding coupling component unit and is used for supplying power to the units;
the second forwarding control unit is respectively connected with the second forwarding intermediate frequency unit, the second forwarding microwave modulation and demodulation unit and the second forwarding coupling component unit, and is used for controlling the units.
2. The apparatus according to claim 1, wherein the microwave transmission unit comprises an analog-to-digital/analog converter, an automatic gain amplifier and a digital microwave transceiving unit, the analog-to-digital/analog converter converts an analog microwave signal to be transmitted into a digital microwave signal or converts a received digital microwave signal into an analog microwave signal, the automatic gain amplifier is used for gain amplifying the digital microwave signal to be transmitted, and the digital microwave transceiving unit is used for transceiving the digital microwave signal.
3. The apparatus of claim 1, wherein the channel fading loss compensation unit specifically comprises a first mixer, a first interpolation unit, a first numerically controlled oscillator, a first quadratic phase-locked loop unit, a second numerically controlled oscillator, a filter, a timing offset obtaining unit, a multiplexing and combining unit, a second mixer, a second interpolation unit, a third numerically controlled oscillator, a second quadratic phase-locked loop unit, a first frequency adjustor, and a second frequency adjustor;
a first input port of the first frequency mixer is connected with an external first multi-path branch, and a second output port of the first frequency mixer is respectively connected with a first input port of the first interpolation unit and a first input port of the first secondary phase-locked loop unit; the second output port of the first secondary phase-locked loop unit is connected with the third input port of the first numerical control oscillator; a first output port and a second output port of the first numerically controlled oscillator are respectively connected with a third input port and a fourth input port of the first mixer one by one; a first input port of the second frequency mixer is connected with an external second multi-path branch, and a second output port of the second frequency mixer is respectively connected with a first input port of the second interpolation unit and a first input port of the second secondary phase-locked loop unit; a second output port of the second secondary phase-locked loop unit is connected with a third input port of a third numerically controlled oscillator; a first output port and a second output port of the third numerically controlled oscillator are respectively connected with a third input port and a fourth input port of the second mixer one by one; the second output port of the first interpolation unit is connected with the first input port of the first frequency regulator; a second output port of the first frequency regulator is connected with a first input port of the timing deviation acquisition unit; a second output port of the second interpolation unit is connected with a first input port of the second frequency regulator; a second output port of the second frequency regulator is connected with a second input port of the timing deviation acquisition unit; a third output port of the timing deviation acquisition unit is connected with a second input port of the filter; the first output port of the filter is connected with the third input port of the second numerically controlled oscillator; a first output port of the second numerically controlled oscillator is connected with a third input port of the first interpolation unit; a second output port of the second numerically controlled oscillator is connected with a third input port of the second interpolation unit; a third output port of the first frequency regulator is connected with a first input port of the multi-path merging unit; a third output port of the second frequency regulator is connected with a second input port of the multi-path merging unit; and a third output port of the multi-path merging unit is connected with an external detection signal output.
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| US5812933A (en) * | 1992-12-30 | 1998-09-22 | Radio Communication Systems Ltd. | Duplex RF repeater for personal communications system |
| CN2216702Y (en) * | 1995-06-16 | 1996-01-03 | 北京理工大学 | Microwave monitoring apparatus for communication monitoring control |
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