CN108011641A - A kind of aerial retransmission unit of LTE base station - Google Patents
A kind of aerial retransmission unit of LTE base station Download PDFInfo
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- CN108011641A CN108011641A CN201711285653.9A CN201711285653A CN108011641A CN 108011641 A CN108011641 A CN 108011641A CN 201711285653 A CN201711285653 A CN 201711285653A CN 108011641 A CN108011641 A CN 108011641A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/38—Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
- H04B1/40—Circuits
- H04B1/44—Transmit/receive switching
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/005—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges
- H04B1/0067—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission adapting radio receivers, transmitters andtransceivers for operation on two or more bands, i.e. frequency ranges with one or more circuit blocks in common for different bands
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B1/00—Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
- H04B1/02—Transmitters
- H04B1/04—Circuits
- H04B2001/0491—Circuits with frequency synthesizers, frequency converters or modulators
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- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
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Abstract
The invention discloses a kind of aerial retransmission unit of LTE base station, including retransmission unit, radio-frequency front-end and transmitting reception antenna, the mode of received spectrum reduction is carried out by being forwarded after signal is carried out undistorted frequency spectrum shift amplification in the air, then on ground, realizes the forwarding of LTE signals.And system has that cost is low, set up simple, maintenanceability is strong, low-power consumption, high reliability, and aerial retransmission unit decorating position flexibility is big, solves blind area covering and part remote districts and the few area of user, to set up the problem of base station cost is too high；And it is internally integrated the variable gain amplifier of Larger Dynamic scope, it is possible to achieve at a distance with closely covering；And automatic realize receives and dispatches time slot switching, switching time can be ignored, and be not in since handoff delay causes loss of data phenomenon；And internal system each several part changeable frequency scope is wider, is convenient for changing frequency range and is forwarded to, wave filter frequency range need to only be corresponded to and changed, can expanded stronger with versatility.
Description
Technical field
The present invention relates to a kind of aerial retransmission unit of LTE base station in the communications field, suitable for field of microwave communication
In TDD-LTE communication systems, poor signal quality, or coverage hole are covered, and extreme terrain is inconvenient to set up the logical of base station
Letter system.
Background technology
Good wireless coverage is to ensure the premise of communication network quality and index.Due to terrain environment, watt level
Influence, radio broadcasting signal overlay area can there are weak signal area or blind area.As city building stand in great numbers, there are large number of ground letter
Number weak area and blind area；Furthermore some remote districts and the few area of user, it is too high will to set up base station cost.Digital transponder can
Transmitting signal first to be received, it is demodulated, then re-modulates and launch again, it is possible to achieve the remote of signal is covered
Lid, and blind area covering, but this mode has higher sampling rate and larger bandwidth of operation, FPGA to ADC, DAC device
Performance also to get well, this mode cost is too high, and complexity is too high, is not easy to repair；The radio frequency of existing TD-LTE is directly put
Stand, it is necessary first to solve design frame synchronization algorithm, design vertical sync circuit, otherwise can not normally be cut in the transmitting-receiving of uplink and downlink
Change；Existing frequency-shift repeater, is to add a near-end machine that signal is moved other frequency ranges in base station end, and a distal end is added at terminal end
Machine becomes communications band again again, if having mountain or other buildings to block between two places, causes remote termination can not receive near-end machine letter
Number when, still can not realize base station terminal communicate；Existing common-frequency repeater, since the transmitting-receiving frequency of forwarding is identical, it is necessary to set
The very high receive-transmit isolation of meter, is otherwise easy to produce self-excitation., so designed that this is low, and it is simple in structure, it is easy to set up, is easy to
Open-minded, forwarding module for ease of maintenaince is current communication problem to be solved.
The content of the invention
The technical problems to be solved by the invention are to design a kind of aerial retransmission unit of LTE base station, in circuit of the present invention
A kind of switching construction is employed, can effectively switch reiving/transmitting state, it is not necessary to considers that base station or the existing state of terminal are
Transmission time slot still receives time slot, it is possible to achieve 0 delay of state switching；Larger Dynamic simulation agc circuit is employed in circuit, can be with
Auto-adjusting circuit gain, transmission power so that retransmission unit can be adapted to the signal of far and near different distance to forward；Due to module
Forwarding module in free, can place a certain position between a base station and a terminal by forwarding module, makes in the case where blocking
Forwarding module and base station and between terminal it is all unobstructed, realize reliable communication, flexibility is stronger.And device volume ratio
It is smaller, convenient fixed erection.Effectively solve communication overlay distance problem, coverage hole, and outlying communication, it has not been convenient to assuming that base
The problem of station etc..
The technical solution adopted by the present invention is：
A kind of aerial retransmission unit for LTE, including retransmission unit 1, for the first antenna launching and receive to
Six antenna 4-9, the first radio-frequency front-end 2 and the second radio-frequency front-end 3；
Base station send, terminal recipient to：
Uplink, the rf modulated signal of LTE base station output are sent into the first radio-frequency front-end 2, are launched by third antenna 6
Go out；Aerial parts, first antenna 4 receive rf modulated signal into retransmission unit 1, and retransmission unit 1 is by rf modulated signal
Alien frequencies modulated signal is converted into, is sent by the second antenna 5；Downlink, the 6th antenna 9 receive alien frequencies modulated signal
Enter the second radio-frequency front-end 3, alien frequencies modulation signal transitions are sent into terminal by the second radio-frequency front-end 3 into LTE frequency signals；
Terminal is sent, and base station receives direction：
Uplink, the rf modulated signal of terminal output are sent into the second radio-frequency front-end 3, are launched by the 5th antenna 8
Go；Aerial parts, first antenna 4, which receives rf modulated signal, turns rf modulated signal into retransmission unit 1, retransmission unit 1
Change alien frequencies modulated signal into, sent by the second antenna 5；Downlink, the 4th antenna 7 by alien frequencies modulated signal receive into
Alien frequencies modulation signal transitions are sent into LTE base station by the first radio-frequency front-end 2, the first radio-frequency front-end 2 into LTE frequency signals.
Wherein, the retransmission unit 1 includes the first wave filter 10, the first amplifier 11, the mixing of the second wave filter 12, first
Device 13, the 3rd wave filter 14, the first variable gain amplifier 15, the second variable gain amplifier 16, the 4th wave filter 17, coupling
Device 18, power amplifier 19, detecting circuit 20, control circuit 21, the first digital circuit 22, first frequency source 23 and second are amplified
Device 24；The rf modulated signal that first antenna 4 exports passes through the first wave filter 10, the first amplifier 11 and the second wave filter successively
Exported after 12 to the first frequency mixer 13；First digital circuit 22 control first frequency source 23 produces required local oscillation signal, local oscillator
Signal is exported to the first frequency mixer 13 after the amplification of the second amplifier 24；First frequency mixer 13 will amplification, filtered radio frequency tune
Output alien frequencies signal to the 3rd wave filter 14 is filtered after signal processed is mixed with amplified local oscillation signal；It is filtered
Alien frequencies signal carries out gain amplification by the first variable gain amplifier 15 and the second variable gain amplifier 16 successively；First can
15 and second variable gain amplifier 16 of variable-gain amplifier respectively increases alien frequencies signal under the control of control circuit 21
Benefit amplification, the amplified alien frequencies signal output of gain to the 4th wave filter 17；4th wave filter 17 is by the amplified alien frequencies of gain
Signal is exported to power amplifier 19 after being filtered through coupler 18；Power amplifier 19 is by the amplified alien frequencies signal of gain
Carry out power amplification and launched by the second antenna 5；Coupler 18 exports the small-signal being coupled out to detecting circuit 20；Inspection
Wave circuit 20 detects the voltage of small-signal, and magnitude of voltage is exported to control circuit 21；Control circuit 21 is according to magnitude of voltage control the
The gain of one variable gain amplifier 15 and the second variable gain amplifier 16.
Wherein, first radio-frequency front-end 2 is identical with 3 structure of the second radio-frequency front-end, includes：First annular device 25,
Three amplifiers 26, the 5th wave filter 27, the second frequency mixer 28, the 4th amplifier 29, the 6th wave filter 30, the second circulator 31,
Second digital circuit 32,33 and the 5th amplifier 34 of second frequency source；
Rf modulated signal is exported through first annular 25 and second circulator 31 of device successively；Alien frequencies modulated signal is successively through
Exported after second ring device 31, the 6th wave filter 30 and the 4th amplifier 29 to the second frequency mixer 28；Second digital circuit 32 controls
Second frequency source 33 produces required local oscillation signal, and local oscillation signal is exported to the second frequency mixer after the amplification of the 5th amplifier 34
28；It is transformed into after second frequency mixer 28 will amplify, filtered alien frequencies modulated signal is mixed with amplified local oscillation signal
LTE frequency signals are exported to the 5th wave filter 27；5th wave filter 27 passes through LTE frequency signals after the 3rd amplifier 26 amplifies
First annular device 25 exports.
The present invention has the following advantages that compared to background technology：
1. the ADC of high speed, DAC circuit is not required in circuit part of the present invention, it is not required that powerful FPGA, numerical portion is only
A piece of common microcontroller is needed, realizes SPI and the monitoring to AD detection values, link state monitoring.
2. the retransmission unit of the present invention, employs the mode of alien frequencies forwarding, by using high degree of suppression wave filter and height
The box body structure design of isolation, can be very good to be forwarded to signal with receiving signal isolation.So that each other will not between passage
Interfere with each other, realize high performance communication capacity.
3rd, retransmission unit part of the invention adds the amplifier of two-stage variable gain, by detecting circuit, is connect
Signal level is received, so that the gain of amplifier is controlled, and very short, the us orders of magnitude of fixing time to signal level gain control lockmaking, protect
The each transmission time slot signal transmission power of LTE signals is demonstrate,proved, realizes under different communication distance, ensures identical emissivities.
4. aerial forwarding module, can set up optional position between a base station and a terminal, it is simple to set up the selection of website, right
Environmental suitability is stronger, more flexibly.
5th, each mould local oscillation signal frequency in the block in the present invention, it is controllable by MCU, it can in a wide range change and turn
Frequency is sent out, mixing device is also Larger Dynamic scope, and working frequency is wider, therefore the present invention can extend to different frequencies, only
Mould wave filter in the block need to be changed and forward frequency to corresponding.
6. the RF front-end part of the present invention employs a kind of circulator structure so that transmitting-receiving handoff delay can neglect substantially
Slightly, it is ensured that when LTE signals carry out transmitting-receiving time slot switching, retransmission unit will not cause signal section to be lost because of handover delay
Lose.
7. the present invention is divided into several independent modules, stable and reliable for performance, maintains easily and debug, frame low with cost
The advantages that if simple, maintenanceability is strong, low-power consumption, and reliability is high, and function is complete.
Brief description of the drawings
Fig. 1 is implementation principle block diagram of the present invention.
Fig. 2 is the hardware realization block diagram of retransmission unit in the present invention.
Fig. 3 is the hardware realization block diagram of radio-frequency front-end in the present invention.
Embodiment
With reference to Fig. 1, the present invention connects by retransmission unit 1, the first radio-frequency front-end 2, the second radio-frequency front-end 3, and for launching
First to the 6th antenna 4,5,6,7 of receipts, 8,9 compositions.Fig. 1 is the implementation principle block diagram of the present invention.
Base station send, terminal recipient to：
Uplink, the rf modulated signal of LTE base station output are sent into the first radio-frequency front-end 2, are launched by third antenna 6
Go out；Aerial parts, first antenna 4 receive rf modulated signal into retransmission unit 1, and retransmission unit 1 is by rf modulated signal
Alien frequencies modulated signal is converted into, is sent by the second antenna 5；Downlink, the 6th antenna 9 receive alien frequencies modulated signal
Enter the second radio-frequency front-end 3, alien frequencies modulation signal transitions are sent into terminal by the second radio-frequency front-end 3 into LTE frequency signals；
Terminal is sent, and base station receives direction：
Uplink, the rf modulated signal of terminal output are sent into the second radio-frequency front-end 3, are launched by the 5th antenna 8
Go；Aerial parts, first antenna 4, which receives rf modulated signal, turns rf modulated signal into retransmission unit 1, retransmission unit 1
Change alien frequencies modulated signal into, sent by the second antenna 5；Downlink, the 4th antenna 7 by alien frequencies modulated signal receive into
Alien frequencies modulation signal transitions are sent into LTE base station by the first radio-frequency front-end 2, the first radio-frequency front-end 2 into LTE frequency signals.
1 major function of retransmission unit of the present invention is the transmitting signal by base station or terminal, is received by antenna into module
Afterwards, be filtered, be mixed, and AGC, power amplification so that signal spectrum is undistorted move another frequency range after, with fixation
Power emission is gone out, and the receiving circuit in retransmission unit 1 uses high-isolation circuit, the filtering device of high degree of suppression so that day
The transmitting-receiving of line 45 will not interfere with each other.As shown in Fig. 2, the retransmission unit 1 includes the first wave filter 10, the first amplifier 11, the
Two wave filters 12, the first frequency mixer 13, the 3rd wave filter 14, the first variable gain amplifier 15, the second variable gain amplifier
16th, the 4th wave filter 17, coupler 18, power amplifier 19, detecting circuit 20, control circuit 21, the first digital circuit 22,
One frequency source 23 and the second amplifier 24；The rf modulated signal that first antenna 4 exports passes through the first wave filter 10, first successively
Exported after 11 and second wave filter 12 of amplifier to the first frequency mixer 13；First digital circuit 22 control first frequency source 23 produces
Required local oscillation signal, local oscillation signal are exported to the first frequency mixer 13 after the amplification of the second amplifier 24；First frequency mixer 13 will
Amplification, filtered rf modulated signal export alien frequencies signal to the 3rd wave filter after being mixed with amplified local oscillation signal
14 are filtered；Filtered alien frequencies signal passes through the first variable gain amplifier 15 and the second variable gain amplifier 16 successively
Carry out gain amplification；First variable gain amplifier 15 and the second variable gain amplifier 16 are respectively in the control of control circuit 21
Under to alien frequencies signal carry out gain amplification, the amplified alien frequencies signal output of gain to the 4th wave filter 17；4th wave filter 17
Exported after the amplified alien frequencies signal of gain is filtered through coupler 18 to power amplifier 19；Power amplifier 19 will increase
The amplified alien frequencies signal of benefit carries out power amplification and is launched by the second antenna 5；The small-signal that coupler 18 will be coupled out
Export to detecting circuit 20；Detecting circuit 20 detects the voltage of small-signal, and magnitude of voltage is exported to control circuit 21；Control circuit
21 control the gain of the first variable gain amplifier 15 and the second variable gain amplifier 16 according to magnitude of voltage.
Received in this unit and use domestic dielectric filter into port filter, there is relatively low Insertion Loss, and preferable rectangle
Coefficient, after ensureing the signal transmitting after forwarding, will not enter receiving channel and produce interference, or self-excitation, and be added in link
The AD8313 of wave detector ADI companies, can monitor the signal power received in real time, while add two-stage variable gain amplification
Device, is also the AD8368 of ADI companies, is ensured under different input power>50dB dynamic ranges, ensure identical forwarding output work
Rate, local oscillator generation is using highly integrated phase discriminator and the chip SI4133 of VCO, and controllable frequency scope is very wide, gain control chain circuit
Proportional integral circuit has been used, by adjusting feedback link capacitance, locking time has been can conveniently adjust, meets communication requirement.
The first and second radio-frequency front-ends 2 of the present invention, 3 part major functions are, when base station or terminal are in hair-like state,
The undistorted transparent emission of signal is gone out, when base station or terminal are in reception state, is first received the signal forwarded in the air
Into module, then, undistorted move to base station of signal frequency is either then fed into base station or end at the receives frequency of terminal
End, carries out reception processing, circuit uses the circuit of highly integrated local vibration source, and frequency can pass through programming Control.Such as Fig. 3 institutes
Show, the first radio-frequency front-end 2 is identical with 3 structure of the second radio-frequency front-end, includes：First annular device 25, the 3rd amplifier the 26, the 5th
Wave filter 27, the second frequency mixer 28, the 4th amplifier 29, the 6th wave filter 30, the second circulator 31, the second digital circuit 32,
33 and the 5th amplifier 34 of second frequency source；
Rf modulated signal is exported through first annular 25 and second circulator 31 of device successively；Alien frequencies modulated signal is successively through
Exported after second ring device 31, the 6th wave filter 30 and the 4th amplifier 29 to the second frequency mixer 28；Second digital circuit 32 controls
Second frequency source 33 produces required local oscillation signal, and local oscillation signal is exported to the second frequency mixer after the amplification of the 5th amplifier 34
28；It is transformed into after second frequency mixer 28 will amplify, filtered alien frequencies modulated signal is mixed with amplified local oscillation signal
LTE frequency signals are exported to the 5th wave filter 27；5th wave filter 27 passes through LTE frequency signals after the 3rd amplifier 26 amplifies
First annular device 25 exports.Local oscillator generation uses highly integrated phase discriminator and the chip SI4133 of VCO, controllable frequency in this unit
Scope is very wide, and receives and dispatches handoff links and do not use switching, but uses circulator to replace switch, can the sound without time delay
Answer the transmitting-receiving time slot of system to switch, be not in because link switching delay causes dropout phenomenon.
Operation principle of the present invention is as follows：
After when either terminal is in emission state for base station, base station or terminal emit signal, into before radio frequency
End module, as shown in figure 3, RF front-end module by signal after circulator, into cross one section of microstrip line after, from another annular
Device exports, and is launched by antenna, aerial retransmission unit, after the signal that radio-frequency front-end is sent is received by antenna, such as Fig. 2
It is shown, after first the signal received is filtered, into low noise amplification, it is amplified, then after secondary filtering, into mixed
Frequency device, moves another frequency range by signal frequency is undistorted, then controls electricity by two-stage variable gain amplifier and detection
After the composition AGC of road, the signal received is amplified to fixed output power 0.5W, is retransmited away through antenna 5, receiving terminal radio frequency
Front-end module, by antenna receive aerial forwarding come signal after, as shown in Figure 3 by circulator, into radio-frequency front-end
Receiving channel, after signal first is filtered amplification, LTE base station or terminal are moved by signal is undistorted by frequency mixer again
Receives frequency.Signal reception is carried out by entering terminal or base station after circulator.
The present invention during realization, mainly using it is following some realize signal blind zone cover, and low cost, low complexity
Degree, convenient maintenance is with setting up function：1st, the method that uses separate module, each module can be tested individually, be debugged, convenient dimension
Repair；2nd, the chip that module uses all is ripe volume production chip, and not as the higher chip of the cost of FPGA etc., the plate of module are equal
The most common FR4 plates used, two-tier circuit plate, cost are relatively low.3rd, RF front-end modules and retransmission unit volume compared with
Small, radio frequency front-end unit volume is 144*119*15mm, and retransmission unit volume is：178.5*110.5*13mm, it is small, use
When above ground portion, it is only necessary to the antenna opening of base station or terminal is connected to the radiofrequency signal input interface of RF front-end module, is penetrated
Frequency front end output interface connects two omnidirectional antennas, and aerial forwarding part only needs to place it in base station between terminal
One position, all the visual field is opposite open between base station and terminal, without substantially blocking, is easily set up due to small.
4th, in the present invention, the amplifier of two-stage gain controllable has been used inside aerial forwarding module, can be very good to realize closely
Be not in that either the too low base station of signal amplitude or terminal can not for signal saturation distortion with covering 100m-10Km at a distance
The phenomenon of reception.5, the power supply of each module is 5V, and electric current very little, retransmission unit are no more than 1.2A, RF front-end part
No more than 0.5A, during use power supply only need to connect upper rechargeable battery or mobile power and can work.Antenna terminal is
SMA-K, convenient installation and dismounting, and after powering up, you can be ready to work, it is not necessary to cumbersome link parameter configuration, 6, every
In a unit module, stateful detection local oscillator locks, and the function such as power detection, can facilitate monitoring link status, Yi Jijin
Row module maintenance etc..
Claims (3)
1. a kind of aerial retransmission unit of LTE base station, including retransmission unit (1) and the first antenna for launching and receiving are to
Six antennas (4-9)；It is characterized in that：Further include the first radio-frequency front-end (2) and the second radio-frequency front-end (3)；
Base station send, terminal recipient to：
Uplink, the rf modulated signal of LTE base station output are sent into the first radio-frequency front-end (2), are launched by third antenna (6)
Go out；Aerial parts, first antenna (4) receive rf modulated signal into retransmission unit (1), and retransmission unit (1) is by radio frequency tune
Signal processed is converted into alien frequencies modulated signal, is sent by the second antenna (5)；Downlink, the 6th antenna (9) is by alien frequencies tune
Signal processed, which is received, send alien frequencies modulation signal transitions into LTE frequency signals into the second radio-frequency front-end (3), the second radio-frequency front-end (3)
Enter terminal；
Terminal is sent, and base station receives direction：
Uplink, the rf modulated signal of terminal output are sent into the second radio-frequency front-end (3), are launched by the 5th antenna (8)
Go；Aerial parts, first antenna (4) receive rf modulated signal into retransmission unit (1), and retransmission unit (1) is by radio-frequency modulations
Signal is converted into alien frequencies modulated signal, is sent by the second antenna (5)；Downlink, the 4th antenna (7) modulate alien frequencies
Signal, which is received, is sent into alien frequencies modulation signal transitions into LTE frequency signals into the first radio-frequency front-end (2), the first radio-frequency front-end (2)
LTE base station.
A kind of 2. aerial retransmission unit of LTE base station according to claim 1, it is characterised in that：The retransmission unit (1)
Including the first wave filter (10), the first amplifier (11), the second wave filter (12), the first frequency mixer (13), the 3rd wave filter
(14), the first variable gain amplifier (15), the second variable gain amplifier (16), the 4th wave filter (17), coupler (18),
Power amplifier (19), detecting circuit (20), control circuit (21), the first digital circuit (22), first frequency source (23) and
Two amplifiers (24)；The rf modulated signal that first antenna (4) receives is successively by the first wave filter (10), the first amplification
Device (11) and the second wave filter (12) are exported to the first frequency mixer (13) afterwards；First digital circuit (22) control first frequency source
(23) local oscillation signal needed for producing, local oscillation signal are exported to the first frequency mixer (13) after the second amplifier (24) amplification；The
Alien frequencies letter is exported after one frequency mixer (13) will amplify, filtered rf modulated signal is mixed with amplified local oscillation signal
Number it is filtered to the 3rd wave filter (14)；Filtered alien frequencies signal is successively by the first variable gain amplifier (15) and the
Two variable gain amplifiers (16) carry out gain amplification；First variable gain amplifier (15) and the second variable gain amplifier
(16) gain amplification, the amplified alien frequencies signal output of gain are carried out to alien frequencies signal under the control of control circuit (21) respectively
To the 4th wave filter (17)；4th wave filter (17) is defeated through coupler (18) after the amplified alien frequencies signal of gain is filtered
Go out to power amplifier (19)；The amplified alien frequencies signal of gain is carried out power amplification and by second day by power amplifier (19)
Line (5) is launched；Coupler (18) exports the small-signal being coupled out to detecting circuit (20)；Detecting circuit (20) detection is small
The voltage of signal, magnitude of voltage is exported to control circuit (21)；Control circuit (21) controls first variable respectively according to magnitude of voltage
The gain of gain amplifier (15) and the second variable gain amplifier (16).
A kind of 3. aerial retransmission unit of LTE base station according to claim 1, it is characterised in that：Before first radio frequency
Hold (2) identical with the second radio-frequency front-end (3) structure, include：First annular device (25), the 3rd amplifier (26), the 5th filtering
Device (27), the second frequency mixer (28), the 4th amplifier (29), the 6th wave filter (30), the second circulator (31), the second numeral electricity
Road (32), second frequency source (33) and the 5th amplifier (34)；
The modulated signal of base station or terminal transmission is exported through first annular device (25) and the second circulator (31) successively；6th day
The alien frequencies modulated signal that line (9) receives is successively after the second circulator (31), the 6th wave filter (30) and the 4th amplifier (29)
Export to the second frequency mixer (28)；Second digital circuit (32) control second frequency source (33) produces required local oscillation signal, this
The signal that shakes is exported to the second frequency mixer (28) after the amplification of the 5th amplifier (34)；Second frequency mixer (28) will amplify, after filtering
Alien frequencies modulated signal and amplified local oscillation signal be mixed after be transformed into LTE frequency signals and export to the 5th wave filter
(27)；5th wave filter (27) exports LTE frequency signals after the amplification of the 3rd amplifier (26) through first annular device (25).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711285653.9A CN108011641B (en) | 2017-12-07 | 2017-12-07 | Aerial forwarding device of LTE base station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711285653.9A CN108011641B (en) | 2017-12-07 | 2017-12-07 | Aerial forwarding device of LTE base station |
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| CN108011641A true CN108011641A (en) | 2018-05-08 |
| CN108011641B CN108011641B (en) | 2019-12-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711285653.9A Active CN108011641B (en) | 2017-12-07 | 2017-12-07 | Aerial forwarding device of LTE base station |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108847877A (en) * | 2018-08-02 | 2018-11-20 | 西安安源智造机电设备有限公司 | Wireless communication is the same as frequency repeater system |
| CN109618352A (en) * | 2019-01-14 | 2019-04-12 | 普兴移动通讯设备有限公司 | A kind of non line of sight relay communications system based on LTE |
| CN111431555A (en) * | 2020-03-30 | 2020-07-17 | 中国电子科技集团公司第三十六研究所 | Method for receiving radio frequency forwarding between mobile forwarding station and ground station |
| CN112770333A (en) * | 2020-12-11 | 2021-05-07 | 武汉虹信科技发展有限责任公司 | 5G NR wireless distributed frequency shift system and frequency shift method |
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| CN201294515Y (en) * | 2008-09-23 | 2009-08-19 | 王水平 | System for forwarding radiofrequency signal of mobile terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108847877A (en) * | 2018-08-02 | 2018-11-20 | 西安安源智造机电设备有限公司 | Wireless communication is the same as frequency repeater system |
| CN109618352A (en) * | 2019-01-14 | 2019-04-12 | 普兴移动通讯设备有限公司 | A kind of non line of sight relay communications system based on LTE |
| CN111431555A (en) * | 2020-03-30 | 2020-07-17 | 中国电子科技集团公司第三十六研究所 | Method for receiving radio frequency forwarding between mobile forwarding station and ground station |
| CN111431555B (en) * | 2020-03-30 | 2021-08-03 | 中国电子科技集团公司第三十六研究所 | Method for receiving radio frequency forwarding between mobile forwarding station and ground station |
| CN112770333A (en) * | 2020-12-11 | 2021-05-07 | 武汉虹信科技发展有限责任公司 | 5G NR wireless distributed frequency shift system and frequency shift method |
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