CN106953677B - Repeater station - Google Patents
Repeater station Download PDFInfo
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- CN106953677B CN106953677B CN201710161020.0A CN201710161020A CN106953677B CN 106953677 B CN106953677 B CN 106953677B CN 201710161020 A CN201710161020 A CN 201710161020A CN 106953677 B CN106953677 B CN 106953677B
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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
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2575—Radio-over-fibre, e.g. radio frequency signal modulated onto an optical carrier
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/29—Repeaters
- H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
- H04B10/293—Signal power control
- H04B10/2931—Signal power control using AGC
-
- 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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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Radio Relay Systems (AREA)
Abstract
The invention is suitable for the communication field, has provided a repeater, comprising: the controller acquires the first signal output power of the first low-noise amplifier and the second signal output power of the uplink signal processor, and respectively adjusts the power of the uplink signals of the first low-noise amplifier and the uplink signal processor according to the first signal output power and the second signal output power so that the total noise coefficient and the output power of an uplink signal chain of the repeater meet requirements, meanwhile, the second low-noise amplifier is arranged between the combiner and the transceiver module, and performs low-noise amplification on the third uplink signal according to the power of the first downlink signal so that the power of the first downlink signal is balanced with that of the third uplink signal, thereby realizing the reduction of the superposed noise of the uplink signals, and the ground coverage of high-quality signals of the base station can be realized.
Description
Technical Field
The invention belongs to the field of communication, and particularly relates to a repeater.
Background
In the current wireless system, large professional radio communication interphone systems are built in general large enterprises and public institutions, government departments and public security systems, and radio frequency resources are more and more in tension along with the development of social economy and the expansion of cities and enterprises. Radio signal blind areas such as dense buildings, traffic tunnels, basements and shielded buildings in cities and enterprises cannot be covered by radio base stations, so that excessive radio base station equipment is built, not only occupies too much radio frequency resources, but also cannot cover radio signals, and is also wasted in economic investment.
In some cities and enterprises, when there are dense buildings, traffic tunnels, basements and other radio signal blind areas, the prior art adopts an optical fiber repeater mode to supplement and cover the blind areas, but the number of the parallel access repeaters under a single base station is too large, uplink signal noise will be superposed, and the ground coverage of base station signals is seriously influenced, so the existing optical fiber repeater can not meet the wireless communication coverage requirement of wireless communication system users.
Disclosure of Invention
The embodiment of the invention provides a repeater, aiming at solving the problems that the number of repeaters parallelly accessed by the repeater under a single base station is too large, the noise of an uplink signal cannot be reduced, and the ground coverage of a base station signal is influenced in serious cases.
The invention is realized in this way, a repeater, comprising: the device comprises a controller, a first low-noise amplifier, a next-stage light receiving and transmitting module, an uplink signal processor, a combiner, a current-stage light receiving and transmitting module, a high-power amplifier and a second low-noise amplifier;
the controller is configured to obtain a first signal output power of the first low-noise amplifier and a second signal output power of the uplink signal processor, and generate a first control signal according to the first signal output power and a second control signal according to the second signal output power;
the first low-noise amplifier is used for receiving the first control signal, performing low-noise amplification on a first uplink signal received by the current-stage remote terminal according to the first control signal, and sending the first uplink signal subjected to the low-noise amplification to the combiner;
the next-stage transceiver optical module is used for converting an optical signal sent by the next-stage remote terminal into a second uplink signal;
the uplink signal processor is used for receiving a first control signal, processing the second uplink signal according to the first control signal and sending the processed second uplink signal to the combiner;
the combiner is used for combining the first uplink signal after low-noise amplification and the second uplink signal after processing to obtain a third uplink signal and sending the third uplink signal to the second low-noise amplifier;
the local-stage transceiver optical module is connected with the upper-stage repeater and is used for converting an optical signal sent by the upper-stage repeater into a first downlink signal;
and the second low-noise amplifier is configured to perform low-noise amplification on the third uplink signal according to the output power of the first downlink signal, and send the third uplink signal after the low-noise amplification to the local-stage transceiver module.
In the repeater provided by the embodiment of the invention, the controller is used for acquiring the first signal output power of the first low-noise amplifier and the second signal output power of the uplink signal processor, and respectively carrying out power adjustment on the uplink signals of the first low-noise amplifier and the uplink signal processor according to the first signal output power and the second signal output power, so that the total noise coefficient and the output power of an uplink signal chain of the repeater meet requirements, meanwhile, the second low-noise amplifier is arranged between the combiner and the transceiver module, and carries out low-noise amplification on the third uplink signal according to the power of the first downlink signal, so that the power of the first downlink signal and the power of the third uplink signal are balanced, thereby reducing the superposed noise of the uplink signal and realizing the ground coverage of high-quality signals of a base station.
Drawings
FIG. 1 is a diagram of an embodiment of a repeater according to the present invention;
FIG. 2 is a structural diagram of a repeater according to an embodiment of the present invention;
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In the repeater provided by the embodiment of the invention, the controller is used for acquiring the first signal output power of the first low-noise amplifier and the second signal output power of the uplink signal processor, and respectively carrying out power adjustment on the uplink signals of the first low-noise amplifier and the uplink signal processor according to the first signal output power and the second signal output power, so that the total noise coefficient and the output power of an uplink signal chain of the repeater meet requirements, meanwhile, the second low-noise amplifier is arranged between the combiner and the transceiver module, and the second low-noise amplifier carries out low-noise amplification on the third uplink signal according to the first downlink signal power, so that the power of the first downlink signal and the power of the third uplink signal are balanced, the superimposed noise of the uplink signal can be reduced, and the ground coverage of high-quality signals of a base station can be realized.
Example (b):
FIG. 1 is a diagram illustrating an embodiment of a repeater according to the present invention, which is mainly used in a cascade mode, the cascade mode comprises a chain cascade mode, a star cascade mode and a mixed cascade mode, wherein the chain cascade mode adopts a mode of a first-stage band and a first-stage band, extends radio signals to a far distance all the time and is suitable for covering wide-range strip-shaped blind areas of highways, railways, oil fields and the like, the star cascade mode is formed by cascading more than 2 second-stage remote terminals at a first-stage remote terminal and is suitable for covering the blind areas in star-shaped landforms or buildings, the mixed cascade mode is used by combining the chain cascade mode and the star cascade mode, and the mode is more flexible in design and application, it is especially suitable for covering blind areas such as cities, enterprises and the like with high landforms and building (structure) complexity.
Taking the star cascade mode as an example, as shown in fig. 1, the star cascade mode includes a base station 1, a near-end unit 2, a primary remote unit 3, a first secondary remote unit 4, and a second secondary remote unit 5.
In the embodiment of the invention, the first secondary remote machine 4 and the second secondary remote machine 5 process the uplink signal and transmit the signal to the cascaded first-stage remote machine 3, the number of the secondary remote machines is generally more than 2, the device is suitable for the coverage of the terrain in star arrangement or the blind areas in buildings (structures), through the connection of the hand-in-hand mode of the plurality of optical fiber repeaters, each stage of repeater processes the uplink signal of the next stage of repeater, so that the noise of the uplink signal to the next stage of remote terminal is far lower than that of the uplink signal of the present stage of remote terminal, the uplink signal power of the next-stage remote machine meets the uplink signal power requirement of the current stage, and simultaneously the downlink signal of the current-stage remote machine is coupled and processed to be balanced with the uplink signal of the next-stage remote machine, then the signal is sent to the next-stage remote machine, so that the noise of the uplink signal is reduced, and the stable coverage of the ground signal can be realized.
FIG. 2 shows a schematic structural diagram of a repeater provided by the present invention, the repeater includes: the device comprises a controller 20, a first low noise amplifier 14, a next-stage transceiver optical module 18, an uplink signal processor 17, a combiner 15, a current-stage transceiver optical module 6, a high-power amplifier 7 and a second low noise amplifier 16.
After acquiring the first signal output power of the first low noise amplifier 14 and the second signal output power of the uplink signal processor 17, the controller 20 generates a first control signal according to the first signal output power and a second control signal according to the second signal output power, and then sends the first control signal to the first low noise amplifier and the second control signal to the uplink signal processor 17. The first low noise amplifier 14 receives the first control signal and performs low noise amplification on the first uplink signal received by the present-stage remote terminal according to the first control signal, then sends the first uplink signal after low noise amplification to the combiner 15, the next-stage transceiver module 18 converts the optical signal sent by the next-stage remote terminal into a second uplink signal, the second uplink signal passes through the uplink signal processor 17, the uplink signal processor 17 receives the second control signal and processes the second uplink signal according to the second control signal, and sends the processed second uplink signal to the combiner 15, the combiner 15 combines the first uplink signal after low noise amplification and the processed second uplink signal to obtain a combined third uplink signal, and sends the third uplink signal to the second low noise amplifier 16, the present-stage transceiver module 6 is connected with the previous stage, the optical signal sent by the upper-stage repeater is converted into a first downlink signal, the third uplink signal is subjected to low-noise amplification through the second low-noise amplifier 16 according to the output power of the first downlink signal, and the third uplink signal subjected to low-noise amplification is sent to the local-stage transceiver module 6.
In the embodiment of the present invention, there may be a plurality of lower transceiver modules 18, and it can be understood that, in this case, one lower transceiver module corresponds to one uplink signal processor and one downlink signal processor.
In the embodiment of the present invention, the first output power and the second output power may be obtained according to a mathematical model in the controller or may be set according to specific requirements. For example, the data model in the controller 20 calculates the sum of the signal-to-noise ratio, the noise coefficient, and the input signal power according to the input signal power and the noise coefficient of the first low noise amplifier 14 and each uplink signal processor 17, calculates the optimal output power value of the first low noise amplifier 14 and each uplink signal processor according to the signal-to-noise ratio when the noise coefficient chain meets the requirement of the noise system of the present apparatus, and controls each module to adjust through the interface according to the calculated output power value by the controller 20. In the practical engineering use process, the total noise coefficient in the processing module noise coefficient chain of the device must be less than or equal to 6dB, under the condition that the input signal is too small or the signal-to-noise ratio is very low due to the influence of a space electromagnetic environment or factors such as optical cable transmission loss and the like, the mathematical model cannot adjust the output power of each module through calculation, the optical fiber repeater has an alarm indication, data is read out through the controller 20 interface, the time can be greatly saved, and the reduction of uplink signal noise is realized.
As an embodiment of the present invention, the repeater further includes a high power amplifier 7, configured to receive the first downlink signal and amplify the downlink signal to a preset power. In some embodiments, the preset power may be set through the RE232 interface, so as to amplify the downlink signal to the power of the coverage area required by the remote terminal according to the requirement, thereby making the coverage area of the signal wider and ensuring the ground coverage of the base station signal.
As an embodiment of the present invention, the repeater is further provided with an isolator 8, the isolator 8 is connected to the high power amplifier 7, and the isolator 8 can eliminate the transmission interference of the first downlink signal amplified by the high power amplifier 7, thereby improving the ground coverage stability of the first downlink signal and further ensuring the signal quality.
As an embodiment of the present invention, the repeater is further provided with a coupler 9 and a downlink signal processor 19, the high power amplifier 7, the isolator 8 and the coupler 9 are sequentially connected on a transmission path of the first downlink signal, the first downlink signal is coupled into the present-stage downlink signal and the next-stage downlink signal through the coupler 9, and the next-stage downlink signal is sent to the downlink signal processor 19, which provides a basis for balancing the power of the uplink signal and the downlink signal of the next-stage transceiver module 18, so that the signal of the repeater is more stable, and the stability of the ground signal coverage is further improved.
As an embodiment of the present invention, the controller 20 feeds back the second uplink signal to the downlink signal processor 19, and the downlink signal processor 19 performs power processing on the downlink signal of the next stage, so that the power of the second uplink signal is balanced with that of the downlink signal of the next stage, thereby making the signal transmitted by the repeater more stable and further making the signal covered on the ground more stable.
As an embodiment of the present invention, the repeater is further provided with a downlink bandpass filter 10, preferably, the downlink bandpass filter is a multi-cavity bandpass filter, the downlink bandpass filter 10 is connected to the coupler 9, the downlink bandpass filter 10 receives the downlink signal of the current stage and performs filtering processing on the downlink signal of the current stage, so as to isolate an interference signal, the signal is processed by filtering so that the signal quality covered on the ground is higher, and the effect of covering the downlink signal is further improved.
As an embodiment of the present invention, the repeater is further provided with an uplink bandpass filter 13, preferably, the uplink bandpass filter 13 is a multi-cavity bandpass filter, the uplink bandpass filter 13 is connected to the first low noise amplifier 14 and the circulator 12, the uplink bandpass filter 13 receives the uplink signal of the current stage and performs filtering processing on the uplink signal of the current stage to obtain the first uplink signal, the signal quality received by the repeater is higher through the filtering processing signal, the signal quality of the next repeater is further improved, and thus the stability of the connection system signal of the whole repeater is improved.
As an embodiment of the present invention, the repeater further includes a circulator 12, where the circulator 12 is respectively connected to the downlink bandpass filter 10 and the uplink bandpass filter 13, the antenna 11 transmits the current-stage downlink signal, and the antenna 11 receives the current-stage uplink signal, the downlink bandpass filter 10 receives the first frequency transmitted by the controller 20, and controls the filtering processing of the current-stage downlink signal according to the first frequency, the uplink bandpass filter 13 receives the second frequency transmitted by the controller 20, and controls the filtering processing of the current-stage uplink signal according to the second frequency, and through the processing of the current-stage signal, the interference of the repeater system transmission signal is reduced, so that the quality of the signal is higher, and the signal coverage on the ground is strengthened, and the effect is better.
In an embodiment of the present invention, the controller 20 may communicate with the above modules, such as the first low noise amplifier, the uplink signal processor, and the like, through the RS232 interface, for example, send a first control signal to the first low noise amplifier through the RS232 interface.
In the embodiment of the invention, the controller is used for obtaining the first signal output power of the first low-noise amplifier and the second signal output power of the uplink signal processor, respectively carrying out power adjustment on the uplink signals of the first low-noise amplifier and the uplink signal processor according to the first signal output power and the second signal output power, so that the total noise coefficient and the output power of an uplink signal chain of the repeater station meet requirements, meanwhile, the second low-noise amplifier is arranged between the combiner and the transceiver module, and the second low-noise amplifier is used for carrying out low-noise amplification on the third uplink signal according to the power of the first downlink signal, so that the power of the first downlink signal and the power of the third uplink signal are balanced, the noise of uplink signal superposition can be reduced, and the stable coverage of high-quality signals of a base station on the ground can be realized.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (9)
1. A repeater, comprising: the device comprises a controller, a first low-noise amplifier, a next-stage light receiving and transmitting module, an uplink signal processor, a combiner, a current-stage light receiving and transmitting module, a high-power amplifier and a second low-noise amplifier;
the controller is configured to obtain a first signal output power of the first low-noise amplifier and a second signal output power of the uplink signal processor, and generate a first control signal according to the first signal output power and a second control signal according to the second signal output power;
the first low-noise amplifier is used for receiving the first control signal, performing low-noise amplification on a first uplink signal received by the current-stage remote terminal according to the first control signal, and sending the first uplink signal subjected to the low-noise amplification to the combiner;
the next-stage transceiver optical module is used for converting an optical signal sent by the next-stage remote terminal into a second uplink signal;
the uplink signal processor is configured to receive a second control signal, process the second uplink signal according to the second control signal, and send the processed second uplink signal to the combiner;
the combiner is used for combining the first uplink signal after low-noise amplification and the second uplink signal after processing to obtain a third uplink signal and sending the third uplink signal to the second low-noise amplifier;
the local-stage transceiver optical module is connected with the upper-stage repeater and is used for converting an optical signal sent by the upper-stage repeater into a first downlink signal;
the high-power amplifier is used for receiving the first downlink signal and amplifying the first downlink signal to preset power;
and the second low-noise amplifier is configured to perform low-noise amplification on the third uplink signal according to the output power of the first downlink signal, and send the third uplink signal after the low-noise amplification to the local-stage transceiver module.
2. The repeater according to claim 1, further comprising an isolator, wherein the isolator is connected to the high power amplifier for eliminating transmission interference of the first downlink signal amplified by the high power amplifier.
3. The repeater according to claim 2, further comprising a coupler and a downlink signal processor, wherein the high power amplifier, the isolator and the coupler are sequentially connected on a transmission path of the first downlink signal, and the coupler is configured to couple the first downlink signal into a present-stage downlink signal and a next-stage downlink signal and send the next-stage downlink signal to the downlink signal processor.
4. The repeater as claimed in claim 3, wherein the downlink signal processor is further configured to perform power processing on the next stage downlink signal according to the second uplink signal, so that the second uplink signal is power balanced with the next stage downlink signal.
5. The repeater as claimed in claim 3, further comprising a downlink band-pass filter, wherein the downlink band-pass filter is connected to the coupler and configured to receive the current-stage downlink signal and filter the current-stage downlink signal to isolate an interference signal.
6. The repeater as claimed in claim 5, further comprising a circulator, said circulator connecting said downstream band-pass filter and said upstream band-pass filter respectively, for transmitting said present-stage downstream signal through an antenna and receiving said present-stage upstream signal through an antenna.
7. The repeater as claimed in claim 6, further comprising an uplink band-pass filter, wherein the uplink band-pass filter is connected to the first low noise amplifier and the circulator, and is configured to receive the current-stage uplink signal and perform filtering processing on the current-stage uplink signal to obtain the first uplink signal.
8. The repeater as claimed in claim 5, wherein the downlink band pass filter is specifically configured to: and receiving the first frequency sent by the controller, and controlling the filtering processing of the downlink signal of the current stage according to the first frequency.
9. The repeater as recited in claim 7, wherein the upstream bandpass filter is specifically configured to:
and receiving a second frequency sent by the controller, and controlling the filtering processing of the current-stage uplink signal according to the second frequency.
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| CN201710161020.0A CN106953677B (en) | 2017-03-17 | 2017-03-17 | Repeater station |
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| CN201710161020.0A CN106953677B (en) | 2017-03-17 | 2017-03-17 | Repeater station |
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| CN106953677B true CN106953677B (en) | 2020-08-11 |
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| CN110392451B (en) * | 2018-04-18 | 2022-07-12 | 京信网络系统股份有限公司 | Base station system |
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| US8634766B2 (en) * | 2010-02-16 | 2014-01-21 | Andrew Llc | Gain measurement and monitoring for wireless communication systems |
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