CN201479134U - GSM wireless repeater station with ascending noise inhibition function - Google Patents
GSM wireless repeater station with ascending noise inhibition function Download PDFInfo
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- CN201479134U CN201479134U CN2009201387637U CN200920138763U CN201479134U CN 201479134 U CN201479134 U CN 201479134U CN 2009201387637 U CN2009201387637 U CN 2009201387637U CN 200920138763 U CN200920138763 U CN 200920138763U CN 201479134 U CN201479134 U CN 201479134U
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Abstract
The utility model relates to a GSM wireless repeater station with ascending noise inhibition function. The GSM wireless repeater station comprises a donor antenna BS and a retransmission antenna MS, and is characterized in that the donor antenna BS is connected with a duplexer [a], the down-link output end of the duplexer [a] is connected with a descending low noise amplifier, the output end of the descending low noise amplifier is connected with a digital processing module through a down converter of a frequency conversion module [1], the output end of the digital processing module is connected with the input end of the descending low noise amplifier through an up converter of a frequency conversion module [2], and the output end of the descending low noise amplifier is connected with a duplexer [b]. The GSM wireless repeater station greatly improves the connection sensitiveness of an up-link of a base station, more GSM wireless repeater stations can be simultaneously used in the same district of the base station, the efficiency of the network utilization in the base station is improved, the cost of network construction is greatly reduced, and the GSM wireless repeater station has wide development prospects on the covering market of GSM communication network.
Description
Technical field
The utility model relates to a kind of Mobile communication direct base station, particularly relates to a kind of gsm wireless repeater that possesses the upstream noise inhibit feature.
Background technology
In today that mobile communication develops rapidly; no matter the overlay area of which kind of radio communication is because blocking of radio frequency signal propagation characteristics and artificial or natural forms; blind area, weak signal area appear through regular meeting; these zones occur easily that call completing rate is low, roaming is smooth, call drop even do not receive phenomenon such as signal, make troubles for the GSM mobile handset user.And the gsm wireless repeater can effectively solve this type of problem, the gsm wireless repeater possesses that volume is little, cost is low, easy for installation, be convenient to advantages such as maintenance, become extremely important network optimization means, to improve communication quality, solve the problems such as call drop of weak signal area and blind area, bring great convenience for the networking of GSM.
The gsm wireless repeater is generally traditional simulation gsm wireless repeater, its principle is fairly simple, uplink downlink is made up of active radiofrequency signal amplification module and passive filtering module, in the middle of practical application, can't avoid raising the back noise level of base station uplink receiver, the major defect that is brought is like this: when the application scenarios of many gsm wireless repeaters of needs use in parallel, the up back noise level in base station superposes, can obviously raise the back noise level of base station uplink receiver, influence the sensitivity of base station uplink receiver, also just limited under same sub-district the quantity of using the gsm wireless repeater, this just requires to possess the equipment of the gsm wireless repeater of upstream noise inhibit feature.
Summary of the invention
The purpose of this utility model provides a kind of gsm wireless repeater that possesses the upstream noise inhibit feature, and it can improve the receiving sensitivity of base station uplink.
The utility model is to realize like this, a kind of gsm wireless repeater that possesses the upstream noise inhibit feature, comprise donor antenna BS and retransmitting antenna MS, it is characterized in that: described donor antenna BS links to each other with duplexer [a], the down link output of described duplexer [a] is connected with descending LNA, the output of described descending LNA is connected with digital signal processing module through the down-conversion of frequency-variable module [1], the output of described digital signal processing module is connected with the input of descending power amplifier through the up-conversion of frequency-variable module [2], and the output of described descending power amplifier links to each other with duplexer [b];
Described retransmitting antenna MS links to each other with duplexer [b], the up link output of described duplexer [b] is connected with up LNA, the output of described up LNA is connected with digital signal processing module through the down-conversion of frequency-variable module [2], the output of described digital signal processing module is connected with the input of descending power amplifier through the up-conversion of frequency-variable module [1], and the output of described descending power amplifier links to each other with duplexer [a].
The utility model adopts software and radio technique, the GSM up time-domain signal of the powerful FPGA device of language function after to digitlization handled, because the gsm system air interface adopts the TDMA multiplex mode, each carrier wave of GSM carrier wave can provide eight access slots, each time slot all can carry a designated user, certain assigned timeslot that is each carrier wave only has user's access, therefore in same sub-district, use under the situation of many gsm wireless repeaters simultaneously, make each equipment that in same sub-district, uses all possess the upstream noise inhibit feature by software and radio technique, this technology is tapped into and uplink synchronous when utilizing the gsm system user, power detection techniques effectively suppresses each vacant working time slot noise level, can guarantee on the time slot in office former base station only to be introduced the upstream noise level of an equipment and do not had many noise storages phenomenon, arbitrary equipment can not cause noise rise to miscellaneous equipment in the system, can efficiently solve the serious problem of the many noise storages of same sub-district active equipment.
Description of drawings
Fig. 1 is the gsm wireless repeater networking work schematic diagram that possesses the upstream noise inhibit feature.
Fig. 2 is connection and the principle general diagram that possesses the gsm wireless repeater of upstream noise inhibit feature.
Fig. 3 is the digital signal processing module principle schematic.
Fig. 4 is a frequency-variable module work schematic diagram.
Embodiment
Below in conjunction with drawings and Examples the utility model is described further.
As shown in Figure 2, the utility model provides a kind of gsm wireless repeater that possesses the upstream noise inhibit feature, comprise donor antenna BS and retransmitting antenna MS, it is characterized in that: described donor antenna BS links to each other with duplexer [a], the down link output of described duplexer [a] is connected with descending LNA, the output of described descending LNA is connected with digital signal processing module through the down-conversion of frequency-variable module [1], the output of described digital signal processing module is connected with the input of descending power amplifier through the up-conversion of frequency-variable module [2], and the output of described descending power amplifier links to each other with duplexer [b];
Described retransmitting antenna MS links to each other with duplexer [b], the up link output of described duplexer [b] is connected with up LNA, the output of described up LNA is connected with digital signal processing module through the down-conversion of frequency-variable module [2], the output of described digital signal processing module is connected with the input of descending power amplifier through the up-conversion of frequency-variable module [1], and the output of described descending power amplifier links to each other with duplexer [a].
See also Fig. 1, Fig. 1 is the gsm wireless repeater networking work schematic diagram that possesses the upstream noise inhibit feature, GSM (BTS) base station is transmitted into the overlay area by antenna with this sector base stations signal, to reach weak signal area and signal blind zone are carried out high-quality signal covering, lay in the boder district of base station coverage cell (being the weak signal zone) possess the upstream noise inhibit feature the gsm wireless repeater to strengthen the signal strength signal intensity of former base station, thereby enlarge the area coverage of base station signal, because possessing each gsm wireless repeater of upstream noise inhibit feature controls the time slot upstream noise of institute overlay area separately, therefore under the situation of many gsm wireless repeaters of same cell base station use in parallel, can guarantee on the time slot in office former base station only to be introduced the upstream noise level of an equipment and do not had many noise storages phenomenon, arbitrary equipment can not cause noise rise to base station (BTS) in the system, eliminate the influence of upstream noise fully to the base station, the gsm wireless repeater quantity of same sub-district information source base station parallel connection with unrestricted, is greatly promoted the efficient that base station network utilizes.
Please continue to consult Fig. 2, the down link that possesses the gsm wireless direct discharging station active channel of upstream noise inhibit feature is: downstream signal carries out Filtering Processing by duplexer to descending RF radio frequency unwanted signal through donor antenna, the down-conversion of amplifying with frequency-variable module 1 through low noise amplifier fades to intermediate-freuqncy signal with under it, but by digital signal processing module intermediate-freuqncy signal is carried out the AD bandpass sampling then and reach opereating specification, intermediate-freuqncy signal after using FPGA to digitlization is again carried out Digital Down Convert (DDC) and Digital Up Convert (DUC) and is carried out multistage low-pass filtering treatment, by D/A it is reverted to intermediate-freuqncy signal again, fade to radiofrequency signal through the up-conversion of frequency-variable module 2 on it again, last radiofrequency signal is amplified through linear power amplifier and is emitted to the overlay area through duplexer filtering from retransmitting antenna again;
Up link is: upward signal is by after the duplexer Filtering Processing, the down-conversion of amplifying with frequency-variable module 2 through low noise amplifier changes to intermediate-freuqncy signal with under it, by digital signal processing module it is carried out the AD bandpass sampling then, intermediate-freuqncy signal after FPGA is to digitlization is carried out noise suppressing function processing and multistage low-pass filtering treatment again, by D/A it is reverted to intermediate-freuqncy signal again, become on through the up-conversion of frequency-variable module 1 again and return to radiofrequency signal, amplify through linear power amplifier at last and through duplexer filtering the GSM upward signal is emitted to base station upward signal receiving terminal from donor antenna again it.
In the utility model preferred embodiment, digital signal processing module as shown in Figure 3, the downstream signal link is: the intermediate-freuqncy signal after the front end frequency conversion is through behind the bandpass sampling of AD, by fpga chip the digital signal after the AD sampling is carried out the envelope detection of power, obtain the synchronizing clock signals of former base station, finish Digital Down Convert and up-conversion simultaneously and carry out multistage low-pass filtering treatment, by DA signal is reduced to intermediate-freuqncy signal at last;
The upward signal link is: the intermediate-freuqncy signal that the GSM upward signal obtains behind LNA and analog frequency mixing is through the bandpass sampling of AD, fpga chip utilizes the descending former base station synchronizing signal that obtains as the up time division signal of GSM is carried out synchronously then, and the power of each data feedback channel detected respectively in real time, when surpassing the reference thresholds that is provided with, signal power then immediately this passage is carried out passage unlatching processing when detecting during current time slots, otherwise this passage remains closed condition, fpga chip is finished Digital Down Convert and up-conversion and is carried out multistage low-pass filtering treatment simultaneously, by DA the signal of handling is reduced to intermediate-freuqncy signal at last;
Wherein, clock generating and distribution module are responsible for providing reference clock to modules such as up-downgoing AD, DA and FPGA, and MCU is responsible for each functional unit is carried out data configuration and effective monitoring.
As shown in Figure 4, described frequency-variable module 1: down link RF signal is come in the back by after the dielectric filter filtering, earlier be down-converted to intermediate-freuqncy signal IF through high linear mixer, intermediate-freuqncy signal is carried out intermediate frequency filtering through the intermediate frequency Surface Acoustic Wave Filter again and is handled output intermediate-freuqncy signal after amplifying again after intermediate frequency amplifies.
Up link: intermediate-freuqncy signal IF carries out intermediate frequency filtering through the intermediate frequency Surface Acoustic Wave Filter earlier to be handled, upconvert to the RF signal through high linear mixer again after the amplification, amplify through dielectric filter filtering and signal again after the mixing, at last again through one-level dielectric filter filtering output RF signal.
Wherein phase-locked loop adopts the LMX2531 chip, is the integrated chip of a VCO+PLL, and independent volume is little respectively than in the past VCO+PLL, the clock that its reference clock must adopt digital signal processing module to provide, and to guarantee signal Synchronization, CPU is responsible for it is carried out phase-locked control.Otherwise frequency-variable module 2 up-downgoing frequency conversion links are through similar step.
The above only is preferred embodiment of the present utility model, and all equalizations of being done according to the utility model claim change and modify, and all should belong to covering scope of the present utility model.
Claims (8)
1. gsm wireless repeater that possesses the upstream noise inhibit feature, comprise donor antenna BS and retransmitting antenna MS, it is characterized in that: described donor antenna BS links to each other with duplexer a, the down link output of described duplexer a is connected with descending LNA, the output of described descending LNA is connected with digital signal processing module through the down-conversion of frequency-variable module [1], the output of described digital signal processing module is connected with the input of descending power amplifier through the up-conversion of frequency-variable module [2], and the output of described descending power amplifier links to each other with duplexer b;
Described retransmitting antenna MS links to each other with duplexer b, the up link output of described duplexer b is connected with up LNA, the output of described up LNA is connected with digital signal processing module through the down-conversion of frequency-variable module [2], the output of described digital signal processing module is connected with the input of descending power amplifier through the up-conversion of frequency-variable module [1], and the output of described descending power amplifier links to each other with duplexer a.
2. the gsm wireless repeater that possesses the upstream noise inhibit feature according to claim 1, it is characterized in that: described digital signal processing module comprises A/D converter, D/A converter, clock generating and distribution module, fpga chip; Described frequency conversion, the intermediate-freuqncy signal of the down-conversion output of module [1,2] is respectively after the logical collection of A/D converter band, give fpga chip, described fpga chip output connects D/A converter, and described clock generating and distribution module provide clock pulse for system.
3. the gsm wireless repeater that possesses the upstream noise inhibit feature according to claim 2, it is characterized in that: described digital signal processing module further comprises the MCU controller, is responsible for each functional unit is carried out data configuration and effective monitoring.
4. the gsm wireless repeater that possesses the upstream noise inhibit feature according to claim 1 is characterized in that: the down-conversion of described frequency-variable module [1,2] is connected to form successively by dielectric filter [3], frequency mixer [4], intermediate frequency amplifier [5], intermediate frequency Surface Acoustic Wave Filter [6], intermediate frequency amplifier [7].
5. the gsm wireless repeater that possesses the upstream noise inhibit feature according to claim 4 is characterized in that the input of described frequency mixer [4] is provided with phase-locked loop, and described phase-locked loop carries out phase-locked control by CPU.
6. the gsm wireless repeater that possesses the upstream noise inhibit feature according to claim 1 is characterized in that: the up-conversion of described frequency-variable module [1,2] is connected to form successively by intermediate frequency Surface Acoustic Wave Filter [8], intermediate frequency amplifier [9], frequency mixer [10], dielectric filter [11], signal amplifier [12], dielectric filter [13].
7. the gsm wireless repeater that possesses the upstream noise inhibit feature according to claim 6 is characterized in that the input of described frequency mixer [10] is provided with phase-locked loop, and described phase-locked loop carries out phase-locked control by CPU.
8. according to claim 5 or the 7 described gsm wireless repeaters that possess the upstream noise inhibit feature, it is characterized in that: described phase-locked loop adopts the LMX2531 chip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009201387637U CN201479134U (en) | 2009-06-11 | 2009-06-11 | GSM wireless repeater station with ascending noise inhibition function |
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| CN2009201387637U CN201479134U (en) | 2009-06-11 | 2009-06-11 | GSM wireless repeater station with ascending noise inhibition function |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102469469A (en) * | 2010-11-17 | 2012-05-23 | 深圳国人通信有限公司 | Vehicle-mounted double-channel correcting repeater |
| CN102545976A (en) * | 2010-12-29 | 2012-07-04 | 深圳国人通信有限公司 | MODEM-based double-channel vehicle-mounted deviation rectification repeater for GSM (Global System for Mobile Communications) |
| CN104080203A (en) * | 2013-03-26 | 2014-10-01 | 阳光凯讯(北京)科技有限公司 | Tetra and GSM (Global System for Mobile Communication) common base station platform based on software radio |
-
2009
- 2009-06-11 CN CN2009201387637U patent/CN201479134U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102469469A (en) * | 2010-11-17 | 2012-05-23 | 深圳国人通信有限公司 | Vehicle-mounted double-channel correcting repeater |
| CN102545976A (en) * | 2010-12-29 | 2012-07-04 | 深圳国人通信有限公司 | MODEM-based double-channel vehicle-mounted deviation rectification repeater for GSM (Global System for Mobile Communications) |
| CN104080203A (en) * | 2013-03-26 | 2014-10-01 | 阳光凯讯(北京)科技有限公司 | Tetra and GSM (Global System for Mobile Communication) common base station platform based on software radio |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20100519 Termination date: 20130611 |