CN1635717A - Frequency shift wireless forwarding point-to-multipoint signal distribution system for mobile communication - Google Patents
Frequency shift wireless forwarding point-to-multipoint signal distribution system for mobile communication Download PDFInfo
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- CN1635717A CN1635717A CN 200310117671 CN200310117671A CN1635717A CN 1635717 A CN1635717 A CN 1635717A CN 200310117671 CN200310117671 CN 200310117671 CN 200310117671 A CN200310117671 A CN 200310117671A CN 1635717 A CN1635717 A CN 1635717A
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Abstract
This invention discloses one point to multi-point signal distribution system of frequency shift wireless transmission in mobile communication, which contains frequency shift near end and far end machine, the base station transmitted down signal received and frequency shifted by frequency shift near end machine and then transmitted to frequency shift far end machine which restoring the signal then transmitting to moveable station, the moveable station transmitted upper signal received and frequency shifted by far end machine then transmitted to frequency shift near end machine which then restoring and transmitting said signal to base station. Said invention also discloses a frequency shift wireless transmission method of mobile communication, frequency shift near end and far end machine.
Description
Technical field
The present invention relates to mobile communication technology, relate in particular to the wireless forwarding of a kind of mobile communication shift frequency a bit to the multi-point signal compartment system.
Background technology
Since this century the eighties, GSM900MHz, GSM1800MHz mobile communication system are in extensive use all over the world, and China user has reached 300,000,000 families at present.Develop rapidly along with China's mobile communication cause, and it is more and more higher to its performance requirement, though the base station capacity of gsm system is very big, but its signal covering radius is limited, and in mobile communications network, cell mobile communication systems usually because of landform, transmission conditions restriction, the blind area that some base station signals do not cover occurs inevitably, often adopt intra-frequency repeater in the ordinary course of things, the regional directed radiation that needs are covered is with dead zone-eliminating or extend the service range of base station.Because technology, there is following problem in intra-frequency repeater commonly used:
Adopting when frequently transmitting the repeater, is homogenous frequency signal because sending and receiving antenna (being donor antenna and user antenna) transmits, in order to guarantee the quality of signal transmission, requires isolation (I) between the two greater than opening maximum gain (G
Max) more than the 10dB, i.e. I＞G
Max+ 10dB.General wireless intra-frequency repeater gain＞90dB, so the general requirement＞100dB of isolation (I), this is to be difficult to realize., be to realize when needing with bar installation dual-mode antenna particularly as highway, residential quarters at level terrain at all.
Intra-frequency repeater commonly used needs the directed plate antenna that employing separates with main frame, volume is bigger, different in order to satisfy the insulated degree requirement between the sending and receiving antenna, and this will have a strong impact on the attractive in appearance of installation environment, and particularly noble residential quarters are unallowed.
Intra-frequency repeater can only realize that generally point-to-point signal covers, and is difficult to realize that some signal to the multiple spot zone covers.
Summary of the invention
At the shortcoming of prior art, the invention provides the wireless forwarding of a kind of mobile communication shift frequency a bit to multi-point signal compartment system and method.
The wireless forwarding of mobile communication shift frequency of the present invention a bit comprises shift frequency near-end machine, shift frequency remote termination to the multi-point signal compartment system; The downstream signal of base station is received also by described shift frequency near-end machine and is emitted to described shift frequency remote termination behind the shift frequency, and the signal that the shift frequency remote termination receives the emission of shift frequency near-end machine also is emitted to travelling carriage behind the frequency recovery with this signal; The upward signal of travelling carriage emission is received also by the shift frequency remote termination and is emitted to shift frequency near-end machine behind the shift frequency, is emitted to the base station behind the signal of shift frequency near-end machine reception shift frequency remote termination emission and the frequency recovery with this signal.
In said system:
The frequency range of the downstream signal of described base station is 930～960MHz, and the frequency range of the downstream signal behind the shift frequency is 1805～1880MHz; The frequency range of the upward signal of described travelling carriage emission is 885～915MHz, and the frequency range of the upward signal behind the shift frequency is 1710～1785MHz.
Corresponding many shift frequency remote terminations of shift frequency near-end machine.
The wireless retransmission method of mobile communication shift frequency of the present invention is: at the down direction of signal, launch behind the base station signal shift frequency that the near-end machine is received, restore ability through remote termination again and received by travelling carriage; At the up direction of signal, launch after making the signal shift frequency of the travelling carriage that remote termination receives, restore just through the near-end machine again and receive by the base station.
Shift frequency near-end machine of the present invention comprises donor antenna, first duplexer, the first descending low noise amplifier, the first down frequency selection shift frequency unit, first downlink power amplifier, the first up low noise amplifier, the first up frequency-selecting shift frequency unit, the first ascending power amplifier, second duplexer, first link antennas; Down direction at signal, receive the downstream signal of base station by donor antenna, this downstream signal enters through the first duplexer filtering and is divided into two-way after the first descending low noise amplifier amplifies, carry out entering after carrier wave frequency-selecting and the frequency translation first downlink power amplifier by the first down frequency selection shift frequency unit respectively again and carry out independent power and amplify, two paths of signals closes the road after second duplexer is launched by first link antennas; Up direction at signal, receive the upward signal of shift frequency remote termination emission by first link antennas and amplify back branch two-way after enter the first up low noise amplifier after the second duplexer filtering, carry out entering after carrier wave frequency-selecting and the frequency recovery the first ascending power amplifier by the first up frequency-selecting shift frequency unit respectively again and carry out independent power and amplify, two paths of signals closes the road after first duplexer is launched by donor antenna.
Shift frequency remote termination of the present invention comprises second link antennas, the 3rd duplexer, the second descending low noise amplifier, the second down frequency selection shift frequency unit, second downlink power amplifier, the second up low noise amplifier, the second up frequency-selecting shift frequency unit, the second ascending power amplifier, the 4th duplexer, user antenna; Down direction at signal, receive the downstream signal of shift frequency near-end machine emission by second link antennas, this downstream signal enters through the 3rd duplexer filtering and is divided into two-way after the second descending low noise amplifier amplifies, carry out entering after carrier wave frequency-selecting and the frequency recovery second downlink power amplifier by the second down frequency selection shift frequency unit respectively again and carry out independent power and amplify, two paths of signals closes the road after the 4th duplexer is launched by user antenna; Up direction at signal, upward signal by the emission of user antenna receiving mobile amplifies back branch two-way after enter the second up low noise amplifier after the 4th duplexer filtering, carry out entering after carrier wave frequency-selecting and the frequency translation the second ascending power amplifier by the second up frequency-selecting shift frequency unit respectively again and carry out independent power and amplify, two paths of signals closes the road after the 3rd duplexer is launched by second link antennas.
Frequency-selecting shift frequency of the present invention unit is connected in sequence by first band pass filter, first frequency mixer, first intermediate-frequency filter, second frequency mixer and second band pass filter; First band pass filter is used to allow the first carrier signal to pass through, it is intermediate-freuqncy signal that first frequency mixer is used for first carrier signal transformation, first intermediate-frequency filter is used to choose required carrier channel, second frequency mixer is used for described intermediate-freuqncy signal is transformed to the first shift frequency carrier signal, and second band pass filter is used to allow the first shift frequency carrier signal to pass through.
In above-mentioned frequency-selecting shift frequency unit:
Between first frequency mixer and first intermediate-frequency filter, be connected with first intermediate frequency amplifier, between first intermediate-frequency filter and second frequency mixer, be connected with second intermediate frequency amplifier, second intermediate-frequency filter and the 3rd intermediate frequency amplifier in turn; First, second and the 3rd intermediate frequency amplifier are used for the compensation power loss.
First intermediate-frequency filter and second intermediate-frequency filter serial connection are to improve the outer inhibition degree of band.
First, second intermediate-frequency filter is a SAW (Surface Acoustic Wave) filter.
The centre frequency of first, second intermediate-frequency filter is 140MHz, and bandwidth of operation is 200kHz.
The local vibration source of first and second frequency mixers adopts constant-temperature crystal oscillator.
The frequency of described constant-temperature crystal oscillator is 10MHz, frequency stability≤± 0.02ppm.
The present invention adopts the shift frequency pass-through mode, i.e. different frequency range is adopted in sending and receiving, so just greatly reduces the insulated degree requirement between the sending and receiving antenna, realizes installing with bar.The sending and receiving antenna volume is little, and simple structure can be integrated with the main frame casing, realizes integratedly, is convenient to install, and beautifies the environment.Can realize simultaneously any signal distributions, realize that the signal of extensive area covers, reduce cost multiple spot.Referring to Fig. 1, the present invention is specially adapted to the information source complexity, switches regional coverings such as frequent, that co-channel interference is serious, as highway, and intensive residential quarters etc.
Description of drawings
Fig. 1 is a system applies schematic diagram of the present invention;
Fig. 2 is a system principle block diagram of the present invention;
Fig. 3 is down frequency selection shift frequency of the present invention unit (06 among Fig. 2, a 07) functional-block diagram.
Embodiment
The present invention is described in further detail below in conjunction with accompanying drawing.
As shown in Figure 2, a bit to the functional-block diagram of multi-point signal compartment system, its basic comprising and operation principle are the wireless forwarding of shift frequency of the present invention:
1) down link
(930～960MHz) enter shift frequency near-end machine 03 to receive the downstream signal of GSM900MHz base station 01 from the space by donor antenna 02, enter downstream branch through 04 filtering of 900MHz duplexer, at first amplify and shunt through the descending low noise amplifier 05 of 900MHz, again by down frequency selection shift frequency unit 06,07 carries out carrier wave frequency-selecting and frequency translation (F1 → F2), and 1800MHz downlink power amplifier 08,09 carries out power amplification respectively, two carrier signals close the road after 1800MHz duplexer 10, (1805～1880MHz) launch with the downstream signal behind the shift frequency by 1800MHz link antennas 11, enter shift frequency remote termination 13 by the space transmission by 12 receptions of 1800MHz link antennas, enter downstream branch through 14 filtering of 1800MHz duplexer, at first amplify and shunt through the descending low noise amplifier 15 of 1800MHz, again by down frequency selection shift frequency unit 16,17 carry out carrier wave frequency-selecting and frequency recovery (behind the F2 → F1), by 900MHz downlink power amplifier 18,19 carry out power amplification respectively, after two carrier signals are closed the road, (930～960MHz) through 900MHz duplexer 20, is emitted to travelling carriage 22 by user antenna 21 for the downstream signal that restores.
2) up link
(885～915MHz) are received from the space by user antenna 21 and to enter shift frequency remote termination 13 upward signal of travelling carriage 22 emission, enter up branch road through 20 filtering of 900MHz duplexer, at first amplify and shunt through the up low noise amplifier 23 of 900MHz, again by up frequency-selecting shift frequency unit 24,25 carry out carrier wave frequency-selecting and frequency translation (f1 → f2), and 1800MHz ascending power amplifier 26,27 carry out power amplification respectively, after two carrier waves close the road, through 1800MHz duplexer 14, (1710～1785MHz) through spatial emission with the upward signal behind the shift frequency by 1800MHz link antennas 12, after the reception of space, enter shift frequency near-end machine 03 by 1800MHz link antennas 11, after 10 filtering of 1800MHz duplexer, enter the ascending branch road, at first amplify and shunt through the up low noise amplifier 28 of 1800MHz, again by up frequency-selecting shift frequency unit 29,30 carry out carrier wave frequency-selecting and frequency recovery (behind the f2 → f1), by 900MHz ascending power amplifier 31,32 carry out power amplification respectively, after two carrier signals are closed the road, (885～915MHz) through 900MHz duplexer 04, sends back base station 01 by donor antenna 02 through spatial emission for the upward signal that restores.
The coupled modes of above-mentioned shift frequency near-end machine 03 and base station 01 information source be by donor antenna 02 through space coupling base station signal, except that these coupled modes, can also be by coupler through the coaxial cable base station signal that directly is coupled.
Uplink and downlink frequency-selecting shift frequency unit is an important component part of the present invention.With Fig. 3 is example: down frequency selection shift frequency unit 06,07 is made up of 900MHz band pass filter 37, frequency mixer 38, intermediate frequency amplifier (39,41,43), intermediate-frequency filter (40,42), frequency mixer 44 and 1800MHz band pass filter 45.The working band of 900MHz band pass filter is 930～960MHz, allows the downlink working frequency band to pass through, and stops the outer unwanted signal of band to pass through.Frequency mixer 38 is transformed to intermediate frequency with required descending carrier signal F1 earlier, choose through intermediate-frequency filter 40,42, after intermediate frequency amplifier 39,41,43 amplified, entering frequency mixer 44 was required shift frequency carrier signal F2 with medium-frequency transformation, chooses through 1800MHz band pass filter 45.The centre frequency of intermediate-frequency filter is 140MHz, and width is 200kHz, just in time chooses a carrier channel.The effect of intermediate frequency amplifier 39,41,43 is compensating band bandpass filter 37 and intermediate-frequency filter 40,42 power losss of being brought, and intermediate frequency amplifier 41 can also be as the impedance matching that improves two intermediate-frequency filters 40,42.The effect of frequency mixer 38 is downstream signal F1 and the local oscillator L with input
O1Be transformed to intermediate-freuqncy signal after the mixing, choose required carrier channel, local oscillator L through intermediate-frequency filter
O1The carrier channel chosen according to downstream signal F1 needs of frequency carry out conversion.The effect of frequency mixer 44 is with intermediate-freuqncy signal and local oscillator L
O2Be shift frequency carrier signal F2 with medium-frequency transformation after the mixing, local oscillator L
O2Frequency according to the F2 needs move to carrier channel carry out conversion.Thereby finish the frequency-selecting and the shift frequency work of carrier signal.
Composition, the operation principle of down frequency selection shift frequency unit 16,17 and up frequency-selecting shift frequency unit 24,25,29,30 and above-mentioned down frequency selection shift frequency unit 06,07 are basic identical, and just the working frequency range of the signal of handling is inequality, is not repeated in this description herein.
Local oscillator L in above-mentioned uplink and downlink frequency-selecting shift frequency unit
O1And L
O2Frequency stability necessary≤± 0.02ppm; Band behind the intermediate-frequency filter two-stage series connection outward degree of inhibition must guarantee 〉=more than the 76dB.Local vibration source adopts the 10MHz constant-temperature crystal oscillator, in the scope of ambient temperature-30 ℃～+ 70 ℃, frequency stability≤± 0.02ppm, intermediate-frequency filter adopts SAW (Surface Acoustic Wave) filter, band with 38dB (representative value) is degree of inhibition outward, and the band behind the two-stage series connection is degree of inhibition 〉=76dB outward.
Donor antenna 02 among the present invention, link antennas 11,12 and user antenna 21 adopt integral antenna on structural design, antenna and main frame casing are combined as an integral body, realize " antenna is built-in ", and make the equipment good looking appearance, simple installation beautifies installation environment.
Claims (14)
1, the wireless forwarding of a kind of mobile communication shift frequency is characterized in that a bit to the multi-point signal compartment system this system comprises shift frequency near-end machine and shift frequency remote termination; The downstream signal of base station is received also by described shift frequency near-end machine and is emitted to described shift frequency remote termination behind the shift frequency, and the signal that the shift frequency remote termination receives the emission of shift frequency near-end machine also is emitted to travelling carriage behind the frequency recovery with this signal; The upward signal of travelling carriage emission is received also by the shift frequency remote termination and is emitted to shift frequency near-end machine behind the shift frequency, is emitted to the base station behind the signal of shift frequency near-end machine reception shift frequency remote termination emission and the frequency recovery with this signal.
2, the wireless forwarding of mobile communication shift frequency as claimed in claim 1 is a bit to the multi-point signal compartment system, it is characterized in that, the frequency range of the downstream signal of described base station is 930～960MHz, and the frequency range of the downstream signal behind the shift frequency is 1805～1880MHz; The frequency range of the upward signal of described travelling carriage emission is 885～915MHz, and the frequency range of the upward signal behind the shift frequency is 1710～1785MHz.
3, the wireless forwarding of mobile communication shift frequency as claimed in claim 1 is characterized in that a bit to the multi-point signal compartment system, corresponding many shift frequency remote terminations of shift frequency near-end machine.
4, the wireless forwarding of mobile communication shift frequency as claimed in claim 1 is a bit to the multi-point signal compartment system, it is characterized in that, donor antenna, link antennas and user antenna adopt integral antenna on structural design, antenna and main frame casing are combined into an integral body.
5, the wireless retransmission method of a kind of mobile communication shift frequency is characterized in that, at the down direction of signal, launches behind the base station signal shift frequency that shift frequency near-end machine is received, and restores just through the shift frequency remote termination to be received by travelling carriage again; At the up direction of signal, launch after making the signal shift frequency of the travelling carriage that the shift frequency remote termination receives, restore just through shift frequency near-end machine again and receive by the base station.
6, a kind of shift frequency near-end machine, it is characterized in that, comprise donor antenna, first duplexer, the first descending low noise amplifier, the first down frequency selection shift frequency unit, first downlink power amplifier, the first up low noise amplifier, the first up frequency-selecting shift frequency unit, the first ascending power amplifier, second duplexer, first link antennas; Down direction at signal, receive the downstream signal of base station by donor antenna, this downstream signal enters through the first duplexer filtering and is divided into two-way after the first descending low noise amplifier amplifies, carry out entering after carrier wave frequency-selecting and the frequency translation first downlink power amplifier by the first down frequency selection shift frequency unit respectively again and carry out independent power and amplify, two paths of signals closes the road after second duplexer is launched by first link antennas; Up direction at signal, receive the upward signal of shift frequency remote termination emission by first link antennas and amplify back branch two-way after enter the first up low noise amplifier after the second duplexer filtering, carry out entering after carrier wave frequency-selecting and the frequency recovery the first ascending power amplifier by the first up frequency-selecting shift frequency unit respectively again and carry out independent power and amplify, two paths of signals closes the road after first duplexer is launched by donor antenna.
7, a kind of shift frequency remote termination, it is characterized in that, comprise second link antennas, the 3rd duplexer, the second descending low noise amplifier, the second down frequency selection shift frequency unit, second downlink power amplifier, the second up low noise amplifier, the second up frequency-selecting shift frequency unit, the second ascending power amplifier, the 4th duplexer, user antenna; Down direction at signal, receive the downstream signal of shift frequency near-end machine emission by second link antennas, this downstream signal enters through the 3rd duplexer filtering and is divided into two-way after the second descending low noise amplifier amplifies, carry out entering after carrier wave frequency-selecting and the frequency recovery second downlink power amplifier by the second down frequency selection shift frequency unit respectively again and carry out independent power and amplify, two paths of signals closes the road after the 4th duplexer is launched by user antenna; Up direction at signal, upward signal by the emission of user antenna receiving mobile amplifies back branch two-way after enter the second up low noise amplifier after the 4th duplexer filtering, carry out entering after carrier wave frequency-selecting and the frequency translation the second ascending power amplifier by the second up frequency-selecting shift frequency unit respectively again and carry out independent power and amplify, two paths of signals closes the road after the 3rd duplexer is launched by second link antennas.
8, a kind of frequency-selecting shift frequency unit is characterized in that, is connected in sequence by first band pass filter, first frequency mixer, first intermediate-frequency filter, second frequency mixer and second band pass filter; First band pass filter is used to allow the first carrier signal to pass through, it is intermediate-freuqncy signal that first frequency mixer is used for first carrier signal transformation, first intermediate-frequency filter is used to choose required carrier channel, second frequency mixer is used for described intermediate-freuqncy signal is transformed to the first shift frequency carrier signal, and second band pass filter is used to allow the first shift frequency carrier signal to pass through.
9, frequency-selecting shift frequency as claimed in claim 8 unit, it is characterized in that, between first frequency mixer and first intermediate-frequency filter, be connected with first intermediate frequency amplifier, between first intermediate-frequency filter and second frequency mixer, be connected with second intermediate frequency amplifier, second intermediate-frequency filter and the 3rd intermediate frequency amplifier in turn; First, second and the 3rd intermediate frequency amplifier are used for the compensation power loss.
10, frequency-selecting shift frequency as claimed in claim 9 unit is characterized in that, first intermediate-frequency filter and second intermediate-frequency filter serial connection are to improve the outer inhibition degree of band.
11, as claim 8,9 or 10 described frequency-selecting shift frequency unit, it is characterized in that first, second intermediate-frequency filter is a SAW (Surface Acoustic Wave) filter.
12, as claim 8,9 or 10 described frequency-selecting shift frequency unit, it is characterized in that the centre frequency of first, second intermediate-frequency filter is 140MHz, bandwidth of operation is 200kHz.
13, frequency-selecting shift frequency as claimed in claim 8 unit is characterized in that, the local vibration source of first and second frequency mixers adopts constant-temperature crystal oscillator.
14, frequency-selecting shift frequency as claimed in claim 13 unit is characterized in that the frequency of described constant-temperature crystal oscillator is 10MHz, frequency stability≤± 0.02ppm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310117671 CN1635717A (en) | 2003-12-31 | 2003-12-31 | Frequency shift wireless forwarding point-to-multipoint signal distribution system for mobile communication |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200310117671 CN1635717A (en) | 2003-12-31 | 2003-12-31 | Frequency shift wireless forwarding point-to-multipoint signal distribution system for mobile communication |
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| CN1635717A true CN1635717A (en) | 2005-07-06 |
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| CN 200310117671 Pending CN1635717A (en) | 2003-12-31 | 2003-12-31 | Frequency shift wireless forwarding point-to-multipoint signal distribution system for mobile communication |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101436869B (en) * | 2008-11-27 | 2012-07-04 | 华为技术有限公司 | Equivalent radio frequency belt defect wave filter circuit, radio frequency chip and receiver |
| CN108092724A (en) * | 2016-11-17 | 2018-05-29 | 翌勤通讯股份有限公司 | Symmetric repeater and method for measuring antenna isolation thereof |
| CN111464194A (en) * | 2020-04-10 | 2020-07-28 | 纳瓦电子（上海）有限公司 | Wireless signal transfer system and wireless signal transfer method |
| CN111866900A (en) * | 2020-06-28 | 2020-10-30 | 四川省大见通信技术有限公司 | Frequency shift mobile communication indoor microdistribution system, method and application |
| 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 |
-
2003
- 2003-12-31 CN CN 200310117671 patent/CN1635717A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101436869B (en) * | 2008-11-27 | 2012-07-04 | 华为技术有限公司 | Equivalent radio frequency belt defect wave filter circuit, radio frequency chip and receiver |
| US8385873B2 (en) | 2008-11-27 | 2013-02-26 | Huawei Technologies Co., Ltd. | Equivalent radio frequency notch filter, radio frequency chip, and receiver |
| CN108092724A (en) * | 2016-11-17 | 2018-05-29 | 翌勤通讯股份有限公司 | Symmetric repeater and method for measuring antenna isolation thereof |
| CN111464194A (en) * | 2020-04-10 | 2020-07-28 | 纳瓦电子（上海）有限公司 | Wireless signal transfer system and wireless signal transfer method |
| CN111866900A (en) * | 2020-06-28 | 2020-10-30 | 四川省大见通信技术有限公司 | Frequency shift mobile communication indoor microdistribution system, method and application |
| 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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