CN108390702A - A kind of distributing antenna system far-end unit and implementation method for supporting full frequency band - Google Patents
A kind of distributing antenna system far-end unit and implementation method for supporting full frequency band Download PDFInfo
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- CN108390702A CN108390702A CN201711458070.1A CN201711458070A CN108390702A CN 108390702 A CN108390702 A CN 108390702A CN 201711458070 A CN201711458070 A CN 201711458070A CN 108390702 A CN108390702 A CN 108390702A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/022—Site diversity; Macro-diversity
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0413—MIMO systems
- H04B7/0426—Power distribution
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W52/00—Power management, e.g. TPC [Transmission Power Control], power saving or power classes
- H04W52/04—TPC
- H04W52/52—TPC using AGC [Automatic Gain Control] circuits or amplifiers
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W88/00—Devices specially adapted for wireless communication networks, e.g. terminals, base stations or access point devices
- H04W88/08—Access point devices
- H04W88/10—Access point devices adapted for operation in multiple networks, e.g. multi-mode access points
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- Computer Networks & Wireless Communication (AREA)
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Abstract
The present invention provides a kind of distributing antenna system far-end unit and implementation method for supporting full frequency band comprising：Programmable Logical processing unit FPGA, programmable radio frequency transmitting link, programmable radio frequency receives link and dual-mode antenna.By in programmable radio-frequency transmissions link setting monitor channel a and programmable radio frequency reception link setting monitor channel b, realize monitoring, adaptively adjusting for the isolation of dual-mode antenna, to, under the premise of need not replace hardware system, all 2G/3G/4G frequency ranges can be only supported by software configuration, and support smooth upgrade to 5G, easy to use, system overall cost is substantially reduced compared with existing product.
Description
Technical field
The present invention relates to wireless communication technology field more particularly to a kind of distributing antenna system distal ends for supporting full frequency band
Unit and implementation method.
Background technology
Currently, distributing antenna system system is mainly used for solving the problems, such as the indoor coverage of signal of building, such as (quotient
Field, gymnasium, large-scale office building etc.).With the promotion of indoor portfolio, distributing antenna system system need constantly upgrading and
Dilatation, to meet the needs of newly-increased；Meanwhile 5G i.e. will be commercial, existing distributing antenna system system, which needs to be transformed again, to be come
Realize the support to 5G frequency ranges.
Existing distributing antenna system far-end unit is the system customized based on frequency, as shown in Figure 1, existing distribution
There are the filter of fixed frequency and duplexers in formula antenna system receiving-transmitting chain, can only support specific frequency range.It is being
During system upgrading or dilatation, different frequency ranges or newly-increased frequency range are supported if necessary, can only pass through the side of more exchange device
Formula carries out.For example, 5G mobile communication indoors covering generally use 3.5GHz frequency ranges, and existing 2G/3G/4G concentrate on 700M~
2700MHz frequency ranges are upgraded to and support 5G that must replace hardware system, thus cause the overlapping investment of equipment, replace simultaneously
Hardware needs a large amount of human cost, system overall cost high.
If distributing antenna system equipment will support all radio frequency bands, cannot be penetrated on radio-frequency receiving-transmitting chain
All devices of the frequency components such as frequency filter, duplexer and chain road need to support whole frequency range.Currently, has chip factory
Quotient, which releases, supports 0 radio-frequency devices for arriving 6GHz whole frequency ranges, designs the distributing antenna system Systems Theory of whole frequency range
On it is feasible.But due to there is no radio-frequency filter piece on receiving-transmitting chain, transmission channel to the interference problem of receiving channel not
It can ignore, systemic breakdown is resulted even in when serious.Transmission channel comes from 2 aspects to the interference of receiving channel：On the one hand
It is that transmitting signal is received antenna reception, causes the device of receives link to be saturated, generate serious non-linear；On the other hand, it sends out
Penetrate the signal intermodulation component of link power amplifier generation, it is possible to fall in upstream frequency range, influence quality of uplink signal.
Under normal circumstances, ensure that downlink signal does not interfere uplink by the space isolation of dual-mode antenna, but since equipment or antenna are attached
Close electromagnetic environment changes, such as space increases metal plate washer newly, and the isolation of dual-mode antenna is caused to change, may cause be
System penalty, or even can not work.
Invention content
Existing insufficient in view of the above technology, the present invention proposes a kind of distributing antenna system distal end for supporting full frequency band
Unit and implementation method, wherein a kind of distributing antenna system far-end unit for supporting full frequency band includes mainly：It is programmable
Logical processing unit FPGA, programmable radio frequency transmitting link, programmable radio frequency receives link and dual-mode antenna.
Wherein, the function of the programmable logic processing unit FPGA, (1) for realizing with distributing antenna system proximal end
The communication of machine receives downlink signal and uplink signal is sent to near-end machine；(2) it is used to receive from distributing antenna system proximal end
The digital signal that machine comes carries out digital filtering and Digital Up Convert and digital pre-distortion DPD, quadrature modulator correction QMC etc.
Processing is sent to the programmable radio frequency transmitting link；(3) it is used to receive to come from the programmable radio frequency receives link
Digital signal carries out Digital Down Convert and digital filtering, is sent to distributing antenna system near-end machine；(4) it is used for and may be programmed
Radio frequency link cooperation realize the dual-mode antenna isolation monitoring, and distributing antenna system is adaptively adjusted
It is whole.
The programmable radio-frequency transmissions link includes mainly digital analog converter, programmable local oscillator generator, orthogonal modulation
Device, variable gain amplifier, high power amplifier, monitor channel a.
The programmable radio-frequency transmissions link, the digital signal for receiving the programmable logic processing unit FPGA,
Analog signal S1 is obtained after carrying out digital-to-analogue conversion, according to the software configuration of local oscillation signal, signal S1 is modulated to what needs emitted
Rf frequency is amplified by variable gain amplifier and high power gain amplifier.The variable gain amplifier is used
The automatic adjustment of system when output power is adjusted and the isolation of dual-mode antenna changes.
The monitor channel a of the programmable radio-frequency transmissions link includes mainly that RF coupler, down-conversion mixer and modulus turn
Parallel operation obtains the signal intermodulation component of the programmable radio-frequency transmissions link for programmable logic processing unit FPGA, and
The feedback link of digital pre-distortion DPD and quadrature modulator correction QMC.
The programmable radio frequency reception link includes mainly adjustable attenuator, low-noise amplifier, programmable local oscillator hair
Raw device, quadrature demodulator, programming speeder, variable gain amplifier, analog-digital converter and monitor channel b.
The programmable radio frequency reception link, for receiving the uplink signal come from antenna, after amplification, according to local oscillator
Specific rf frequency solution is transferred to base band by the software configuration of signal, then after low-pass filtering and analog-digital converter sampling,
It is sent to programmable logic processing unit FPGA.
Adjustable attenuator and variable gain amplifier in the programmable radio frequency reception link become for isolation of system degree
Link gain distribution is adjusted when change.
The monitor channel b of the receives link includes mainly RF coupler, local oscillator generator, down-conversion mixer, may be programmed
Low-pass filter and power-sensing circuit, for measuring the power transmitted signals to up to the programmable radio frequency reception link,
Calculate the isolation between dual-mode antenna.
The present invention also provides a kind of implementation methods for the distributing antenna system far-end unit for supporting full frequency band, by described
Method can realize monitoring, adaptively adjusting for the isolation of the dual-mode antenna.
Wherein, the isolation computational methods between the dual-mode antenna include：
Step (1)：The output power Pout of the programmable transmitting link is obtained by the monitor channel a.Assuming that
The gain of monitor channel a is Ct, the monitor channel a output powers that the programmable logic processing unit FPGA is detected are Pt,
Pout=Pt|Ct。
Step (2), the bandwidth of the local oscillator generator and programming speeder of configuration monitoring channel b, makes transmitting signal
Frequency spectrum be in the passband of programming speeder, the output power P of power-sensing circuitrFor the transmitting work(received
Rate.Assuming that the gain of reception antenna mouth to monitor channel b power-sensing circuits is Gr, correspond to the power P of reception antenna mouthin,
Pin=Pr+Gr。
Isolation G, G=P between the dual-mode antennain-Pout。
The self-adapting regulation method of the distributing antenna system, including：
If the power P that monitor channel b is detectedinThe maximum input that can be born more than the programmable radio frequency receives link
Power threshold Pthd, by adjusting the value of the adjustable attenuator in the programmable radio frequency receives link, make to compile into described
The power of LNA in the radio frequency reception link of journey is no more than Pthd.By increase in the programmable radio frequency receives link can
The gain of variable-gain amplifier maintains the gain of the programmable radio frequency receives link constant.
Lead to becoming larger for the isolation between transmitting and receiving antenna when external environment changes, if the power P that monitor channel b is detectedin
The maximal input thresholding P that can be born less than the programmable radio frequency receives linkthd, then adjust automatically adjustable attenuator
With the value of variable gain amplifier, the noise coefficient for improving the programmable radio frequency receives link.
The self-adapting regulation method of the distributing antenna system further includes：
Programmable logic processing unit FPGA is filtered the monitor channel a signals received using digital filter, obtains
The intermodulation component of transmitting signal is taken to be located at the power P received in frequency rangeIMD, the power P of intermodulation component arrival reception antennaimband=
PIMD|G.Define the programmable radio frequency receives link interference signal allow highest thresholding beIfThen output work is reduced by reducing the variable gain amplifier of the programmable radio frequency transmitting link
Rate, to avoid interference uplink signal.The isolation between transmitting and receiving antenna is caused to increase when external environment changes,
The gain for then emitting the variable gain amplifier of link by increasing the programmable radio frequency, to ensure the strong of transmitting signal
Degree.
Beneficial effects of the present invention：Under the premise of need not replace hardware system, it can only be supported by software configuration
All 2G/3G/4G frequency ranges, and support the smooth upgrade to 5G, easy to use, system overall cost drops significantly compared with existing product
It is low.
Description of the drawings
Fig. 1 is traditional distributing antenna system far-end unit schematic diagram；
Fig. 2 is the distributing antenna system far-end unit schematic diagram of the present invention；
Fig. 3 is the flow chart of the self-adapting regulation method 1 of distributing antenna system of the present invention；
Fig. 4 is the flow chart of the self-adapting regulation method 2 of distributing antenna system of the present invention.
Specific implementation mode
The embodiment of the present invention is further elaborated below in conjunction with attached drawing.
If shown in Fig. 1, traditional distributing antenna system far-end unit, radio-frequency receiving-transmitting chain generally comprises rf filtering
The frequencies such as device, duplexer customize device, can not support the application of full frequency band.
Fig. 2 is the distributing antenna system far-end unit of invention, and programmable radio frequency transmitting link mainly wraps
Include the digital analog converter being linked in sequence, local oscillator generator, quadrature modulator, variable gain amplifier, high power gain amplifier,
Monitor channel a realizes the emission function of downlink signal.
Wherein, radio-frequency modulations use zero intermediate frequency modulation scheme, are generated outside band to avoid the mirror image and local-oscillator leakage of modulator
It is spuious.Because emitting the presence of link monitor channel a, programmable logic processing unit FPGA can pass through real-time orthogonal modulation
Device correction QMC algorithms are corrected quadrature modulator.It is industry general-purpose algorithm that quadrature modulator, which corrects QMC algorithms, herein not
It repeats again.
As shown in Fig. 2, the variable gain amplifier in programmable radio frequency transmitting link can be used for dynamic regulation output work
Rate can be used for adaptively adjusting system gain when isolation between transmitting and receiving antenna changes, and see below described.
As shown in Fig. 2, monitor channel a is from coupled RF signal after high power gain amplifier, after down coversion, by mould
Number converter samples, and it is single that the digital signal after sampling is sent to programmable logic processing.Monitor channel a has 3 effects：When
The observation channel of QMC is corrected as digital pre-distortion DPD and quadrature modulator, second is that obtaining the output of high power gain amplifier
Power, third, the intermodulation component of extraction transmitting signal, for weighing whether the intermodulation can have interference to uplink signal.
As shown in Fig. 2, programmable radio frequency receives link includes mainly adjustable attenuator, the low noise amplification being linked in sequence
Device, local oscillator generator, quadrature demodulator, programming speeder, variable gain amplifier, analog-digital converter, monitor channel
B realizes the receive capabilities of radiofrequency signal.
Wherein, adjustable attenuator and variable gain amplifier can dynamically adjust the gain distribution of link, for receiving and dispatching
Isolation between antennas adaptively adjusts system gain when changing, and sees below described.
As shown in Fig. 2, monitor channel b coupled signals after low-noise amplifier, filtered by programmable filter after down coversion
Except unwanted frequency component, subsequently into power-sensing circuit.The performance number of detection is sent to programmable logic processing unit
FPGA is used for the isolation of computing system dual-mode antenna.
As shown in Fig. 2, programmable logic processing unit FPGA, is mainly used for realizing and distributing antenna system near-end machine
Communication and digital signal processing function, including it is digital filtering, Digital Up Convert, Digital Down Convert, digital pre-distortion DPD, orthogonal
Modulator corrects QMC etc..Meanwhile programmable logic processing unit FPGA is used to monitor the isolation between dual-mode antenna, and root
It, can steady operation according to the gain of the variation self-adapted adjustment system of isolation.
According to described above, programmable radio frequency emit the interference of link pair programmable radio frequency receives link essentially from
In 2 aspects.Wherein, transmitting signal is directly received antenna reception, if isolation is too poor, may lead to programmable radio frequency
The saturation of receives link.
Isolation computational methods between dual-mode antenna are as follows：
First, the output power P of transmitting link is obtained by monitor channel aout.Assuming that the gain of monitor channel a is Gt,
The monitor channel a output powers that programmable logic processing unit FPGA is detected are Pt, then Pout=Pt|Gr。
The bandwidth of the local oscillator and programming speeder of configuration monitoring channel b makes the frequency spectrum of transmitting signal be in low pass
In the passband of filter, the output power P of wave detector at this timerFor the transmission power received.Assuming that reception antenna mouth to monitoring
The gain of channel b wave detectors is Cr, then the power for corresponding to reception antenna mouth is Pin=Pr|Gr.Therefore deduce that transmitting-receiving day
Isolation G between line is：
G=Pin-Pout
According to described above, programmable radio frequency emit the interference of link pair programmable radio frequency receives link essentially from
In 2 aspects.Wherein, transmitting signal is directly received antenna reception, if isolation is too poor, may lead to programmable radio frequency
The saturation of receives link.It is as follows for the self-adapting regulation method of the situation：
If the power P that monitor channel b is detectedinThe maximal input thresholding P that can be born more than receiverthd, then
The value for adjusting the adjustable attenuator before low-noise amplifier makes the power into low-noise amplifier be no more than Pthd.Meanwhile it should
Interference signal can be low pass filtering device and filter out, it is possible to the gain for increasing the variable gain amplifier after filter, to maintain
The gain of entire receiver is constant.Isolation between transmitting and receiving antenna is caused to become larger when external environment changes, Pin＜ Pthd, then adjust automatically
The value of adjustable attenuator and variable gain amplifier, to improve the noise coefficient of receiver.The adjustment flow is as shown in Figure 3.
According to described above, since programmable radio frequency emits the signal intermodulation component of the non-linear generation of link device,
Uplink signal may be interfered.For example, 3GPP Band3, downstream frequency range is 1805MHz to 1880MHz, on
Line frequency ranging from 1710MHz to 1785MHz.Due to uplink and downlink frequency interval very little, the positive benefit of intermodulation component of downlink signal
In in uplink band, if the receive-transmit isolation of antenna is smaller, uplink signal may be caused to block.For the situation
Method of adjustment is as follows：
First, the isolation G of dual-mode antenna is calculated according to method as described above.Then, programmable logic processing unit
FPGA is filtered the monitor channel a signals received using digital filter, and the intermodulation component of acquisition transmitting signal, which is located at, to be connect
Receive the power P in frequency rangeIMD.It is possible thereby to calculate the power P that the intermodulation component reaches reception antennamband-PIMD|G.Definition connects
The highest thresholding that the interference signal of programmable radio frequency receives link allows isIfIt then needs to lead to
The variable gain amplifier of adjustment programmable radio frequency transmitting link is crossed to reduce output power of transmitter, to avoid interference uplink
Signal.Isolation between transmitting and receiving antenna is caused to increase when external environment changes,Then it is automatically increased variable gain amplification
The gain of device, to ensure the intensity of transmitting signal.The adjustment flow is as shown in Figure 4.
According to described above, after isolation between transmitting and receiving antenna is deteriorated, distributing antenna system can be stablized by adjust automatically
Work.But due to gain distribution or the output power of transmitter for having adjusted receiver, can cause upstream noise coefficient increase or
Down output power reduces, and can reduce the coverage area of distributing antenna system accordingly.Therefore, system is in the same of adjust automatically
When, user's alarm signal is also generated, to prompt network maintenance staff to check equipment periphery electromagnetic environment.Wait for that network maintenance staff disappears
After leading to the factor that antenna receive-transmit isolation is deteriorated, system can automatically restore to optimum Working.
From the foregoing, it will be observed that the present invention provides a kind of distributing antenna system far-end unit for supporting full frequency band, software can be passed through
Arbitrary 2G/3G/4G frequency ranges are supported in configuration, and support the smooth evolution to 5G, and nothing needs to change any hardware device.
Finally, it should be noted that above example is only used to illustrate the technical scheme of the present invention, rather than its limitations.This
Equivalent replacement of the related technical personnel in field according to this programme to the modification of above example or to partial function unit,
Protection scope of the present invention is not departed from.
Claims (7)
1. a kind of distributing antenna system far-end unit for supporting full frequency band, far-end unit include：Programmable logical process list
First FPGA, programmable radio frequency transmitting link, programmable radio frequency receives link and dual-mode antenna, the programmable radio frequency hair
It includes digital analog converter, programmable local oscillator generator, quadrature modulator, variable gain amplifier, high power amplification to penetrate link
Device, the programmable radio frequency reception link includes adjustable attenuator, low-noise amplifier, programmable local oscillator generator, orthogonal
Demodulator, programmable low-pass filter, variable gain amplifier, analog-digital converter, which is characterized in that the programmable radio frequency
Emit link setting monitor channel a, the programmable radio frequency reception link setting monitor channel b.
2. it is according to claim 1 support full frequency band distributing antenna system far-end unit, which is characterized in that it is described can
Program radio-frequency transmissions link monitor channel a, include mainly：RF coupler, down-conversion mixer and analog-digital converter, for obtaining
The output power and signal intermodulation component of the programmable radio-frequency transmissions link.
3. it is according to claim 1 support full frequency band distributing antenna system far-end unit, which is characterized in that it is described can
Program radio frequency reception link monitor channel b, include mainly：It is RF coupler, local oscillator generator, down-conversion mixer, programmable
Low-pass filter and power-sensing circuit, for measuring the power transmitted signals to up to the programmable radio frequency reception link,
Calculate the isolation between the dual-mode antenna.
4. a kind of implementation method for the distributing antenna system far-end unit for supporting full frequency band, which is characterized in that the method can
Realize monitoring, adaptively adjusting for the isolation of the dual-mode antenna.
5. the implementation method of the distributing antenna system far-end unit of support full frequency band according to claim 4, feature
It is, the isolation computational methods between the dual-mode antenna include：
Step (1)：The output power P of the programmable transmitting link is obtained by the monitor channel aout；Assuming that monitoring is logical
The gain of road a is Gt, and the monitor channel a output powers that the programmable logic processing unit FPGA is detected are Pt, Pout-Pt+
Gt；
Step (2), the bandwidth of the local oscillator generator and programming speeder of configuration monitoring channel b, makes the frequency of transmitting signal
In passband of the spectrum in programming speeder, the output power P of power-sensing circuitrFor the transmission power received；It is false
If the gain of reception antenna mouth to monitor channel b power-sensing circuits is Gr, correspond to the power P of reception antenna mouthin, Pin-Pr|
Gr；
Isolation G, G=P between the dual-mode antennain Pout。
6. the implementation method of the distributing antenna system far-end unit of support full frequency band according to claim 4, feature
It is, the self-adapting regulation method of the distributing antenna system, including：
If the power P that monitor channel b is detectedinThe maximal input that can be born more than the programmable radio frequency receives link
Thresholding Pthd, by adjusting the value of the adjustable attenuator in the programmable radio frequency receives link, make to enter described programmable
The power of LNA in radio frequency reception link is no more than Pthd；By increasing the variable increasing in the programmable radio frequency receives link
The gain of beneficial amplifier maintains the gain of the programmable radio frequency receives link constant；
Lead to becoming larger for the isolation between transmitting and receiving antenna when external environment changes, if the power P that monitor channel b is detectedinIt is less than
The maximal input thresholding P that the programmable radio frequency receives link can be bornthd, then adjust automatically adjustable attenuator and can
The value of variable-gain amplifier, the noise coefficient for improving the programmable radio frequency receives link.
7. the implementation method of the distributing antenna system far-end unit of support full frequency band according to claim 4, feature
It is, the self-adapting regulation method of the distributing antenna system further includes：Programmable logic processing unit FPGA is using number
Filter is filtered the monitor channel a signals received, and the intermodulation component for obtaining transmitting signal is located at the work(received in frequency range
Rate PIMD, the power P of intermodulation component arrival reception antennainband=PIMD|G；Define the dry of the programmable radio frequency receives link
The highest thresholding for disturbing signal permission is P 'thdIf Pinband＞ P 'thd, then emit link by reducing the programmable radio frequency
Variable gain amplifier reduces output power, to avoid interference uplink signal；When external environment variation leads to the transmitting-receiving day
Line isolation increases, Pinband＜ P 'thd, then emit the variable gain amplifier of link by the increase programmable radio frequency
Gain, to ensure the intensity of transmitting signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711458070.1A CN108390702A (en) | 2017-12-28 | 2017-12-28 | A kind of distributing antenna system far-end unit and implementation method for supporting full frequency band |
| PCT/CN2018/075964 WO2019127859A1 (en) | 2017-12-28 | 2018-02-09 | Remote unit of distributed antenna system supporting full frequency band and implementation method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711458070.1A CN108390702A (en) | 2017-12-28 | 2017-12-28 | A kind of distributing antenna system far-end unit and implementation method for supporting full frequency band |
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| Publication Number | Publication Date |
|---|---|
| CN108390702A true CN108390702A (en) | 2018-08-10 |
Family
ID=63076667
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|---|---|---|---|
| CN201711458070.1A Pending CN108390702A (en) | 2017-12-28 | 2017-12-28 | A kind of distributing antenna system far-end unit and implementation method for supporting full frequency band |
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| Country | Link |
|---|---|
| CN (1) | CN108390702A (en) |
| WO (1) | WO2019127859A1 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109462420A (en) * | 2018-12-28 | 2019-03-12 | 西安烽火电子科技有限责任公司 | A kind of ultrashort wave radio transmitting device |
| CN110708082A (en) * | 2019-10-10 | 2020-01-17 | 中科睿微(宁波)电子技术有限公司 | Wireless communication transmitter and transmitting method |
| US10887017B2 (en) | 2019-02-23 | 2021-01-05 | Zinwave, Ltd. | Multi-range communication system |
| WO2022218030A1 (en) * | 2021-04-16 | 2022-10-20 | 罗森伯格技术有限公司 | Remote device and 5g distributed system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI753437B (en) * | 2020-05-22 | 2022-01-21 | 四零四科技股份有限公司 | Receiving device and method for dynamically adjusting the attenuation of the receiving signal |
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| CN201039169Y (en) * | 2007-04-24 | 2008-03-19 | 福建三元达通讯有限公司 | A multi-channel radio repeater |
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| WO2022218030A1 (en) * | 2021-04-16 | 2022-10-20 | 罗森伯格技术有限公司 | Remote device and 5g distributed system |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2019127859A1 (en) | 2019-07-04 |
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Application publication date: 20180810 |
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