CN204349987U - The simulation repeater that a kind of bandwidth chahnel can be joined - Google Patents
The simulation repeater that a kind of bandwidth chahnel can be joined Download PDFInfo
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- CN204349987U CN204349987U CN201420856749.1U CN201420856749U CN204349987U CN 204349987 U CN204349987 U CN 204349987U CN 201420856749 U CN201420856749 U CN 201420856749U CN 204349987 U CN204349987 U CN 204349987U
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- frequency mixer
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Abstract
The utility model relates to the simulation repeater that a kind of bandwidth chahnel can be joined, and the filter unit of the uplink downlink of described simulation repeater is made up of level Four frequency mixer and two-stage intermediate frequency Surface Acoustic Wave Filter, and first order frequency mixer and second level frequency mixer share a local oscillator LO
1, three-mixer and fourth stage frequency mixer share a local oscillator LO
2; Input radio frequency signal RF
1first undertaken being mixed down IF by first order frequency mixer
1, after the filtering of first order intermediate frequency sound table, by same local oscillator LO
1second level frequency mixer carry out being mixed down RF
2=RF
1, RF
2again by new local oscillator LO
2three-mixer carry out being mixed down IF
2, after the intermediate frequency sound table filtering of the second level, then by same local oscillator LO
2fourth stage frequency mixer carry out being mixed down RF
3=RF
2=RF
1, finally amplify output.The beneficial effects of the utility model are: the maximum filtering bandwidth of the passage in this simulation repeater is determined by intermediate frequency Surface Acoustic Wave Filter, by the initial frequency F of configuration change radio frequency
startand by frequency F
stop, the filtering channel bandwidth of equipment can be changed, without the need to changing hardware.
Description
Technical field
The utility model belongs to mobile communications network soverlay technique field, particularly relates to the simulation repeater that a kind of bandwidth chahnel can be joined.
Background technology
Radio Spectrum Resource is not inexhaustible, nexhaustible public resource, and its finiteness highlights day by day.There is clear and definite division in nothing committee of country to the frequency of utilization of operator and can upgrades, such as the Band3 of corresponding 3GPP, and original China Mobile is assigned with 15M bandwidth, expands to 25M afterwards, up 1710 ~ 1735MHz, descending 1805 ~ 1830MHz; CHINAUNICOM was originally assigned with 10M, expanded to 20M afterwards, up 1735 ~ 1755MHz, descending 1830 ~ 1850MHz.
Traditional simulation repeater, according to band bandwidth fixed filters, just needs the hardware circuit in adjustment System when appearance will change band bandwidth.So equipment manufacturer needs to prepare different products in order to the different market demands, easily occur that certain product is dull.Simultaneously as fruit product runs in a network, not band support expansion, needs the product more renewed, or equipment of pulling down beams back producer's transformation of the way, and cost is higher.
Summary of the invention
The purpose of this utility model is the deficiency overcoming prior art existence, and the simulation repeater providing a kind of bandwidth chahnel to join.
The purpose of this utility model has been come by following technical solution.The simulation repeater that this bandwidth chahnel can be joined, the filter unit of the uplink downlink of described simulation repeater is made up of level Four frequency mixer and two-stage intermediate frequency Surface Acoustic Wave Filter, and first order frequency mixer and second level frequency mixer share a local oscillator LO
1, three-mixer and fourth stage frequency mixer share a local oscillator LO
2; Input radio frequency signal RF
1first undertaken being mixed down IF by first order frequency mixer
1, after the filtering of first order intermediate frequency sound table, by same local oscillator LO
1second level frequency mixer carry out being mixed down RF
2=RF
1, RF
2again by new local oscillator LO
2three-mixer carry out being mixed down IF
2, after the intermediate frequency sound table filtering of the second level, then by same local oscillator LO
2fourth stage frequency mixer carry out being mixed down RF
3=RF
2=RF
1, finally amplify output.
As preferably, described two-stage intermediate frequency Surface Acoustic Wave Filter adopts same model filter, the centre frequency F of this model filter
c, bandwidth B; Described local oscillator LO
1lO is set
1=F
start-F
c+ B/2, local oscillator LO
2lO is set
2=F
stop-F
c-B/2, namely can realize bandwidth chahnel is F
stop-F
startfiltering, by change F
startor F
stopvalue namely can be real-time change filtering channel bandwidth.
The beneficial effects of the utility model are: the maximum filtering bandwidth of the passage in this simulation repeater is determined by intermediate frequency Surface Acoustic Wave Filter, by the initial frequency F of configuration change radio frequency
startand by frequency F
stop, the filtering channel bandwidth of equipment can be changed, without the need to changing hardware.
Accompanying drawing explanation
Fig. 1 is simulation repeater of the present utility model filter unit structural representation.
Fig. 2 is the spectrum diagram after first frequency mixer of the present utility model.
Fig. 3 is the spectrum diagram after the 3rd frequency mixer of the present utility model.
Embodiment
Below in conjunction with accompanying drawing, detailed introduction is done to the utility model: as shown in Figure 1, the filter unit of the uplink downlink of simulation repeater of the present utility model is made up of level Four frequency mixer and two-stage intermediate frequency Surface Acoustic Wave Filter, wherein, described intermediate frequency Surface Acoustic Wave Filter adopts same model (centre frequency F
c, bandwidth B); First and second grades of frequency mixers share a local oscillator LO
1, third and fourth grade of frequency mixer shares a local oscillator LO
2.
Described input radio frequency signal RF
1first IF is mixed down
1, after the filtering of first order intermediate frequency sound table, by same local oscillator LO
1carry out being mixed down RF
2=RF
1, RF
2again by new local oscillator LO
2be mixed down IF
2, after the intermediate frequency sound table filtering of the second level, then by same local oscillator LO
2be mixed down RF
3=RF
2=RF
1, finally amplify output.
Described local oscillator LO
1lO is set
1=F
start-F
c+ B/2, local oscillator LO
2lO is set
2=F
stop-F
c-B/2, can realize bandwidth chahnel is F
stop-F
startfiltering, by change F
startor F
stopvalue can real-time change filtering channel bandwidth and do not need change hardware, maximum configurable filtering channel bandwidth is the filtering bandwidth B of intermediate frequency sound table.
Be described below in conjunction with concrete instance, for China Mobile DCS, downlink radio-frequency signal initial frequency is 1805MHz, and cut-off frequency is 1830MHz.Now select or customize the intermediate frequency Surface Acoustic Wave Filter of a excellent performance, its centre frequency is 140MHz, and filtering bandwidth is 40MHz.
Arranging initial frequency by operation interface is 1805MHz, and cut-off frequency is 1830MHz.Bottom software is by the LO of formulae discovery acquisition above
1and LO
2after PLL be set export corresponding local frequency.
Spectrum diagram is as shown in Figure 2 after first order frequency mixer for signal, dash area is the passband (120 ~ 160MHz) of intermediate frequency Surface Acoustic Wave Filter, intermediate-freuqncy signal after filtered is through second level frequency mixer mixing, again move back to original radio frequency band, now the signal of 1805 ~ 1845MHz by leaching out.
Spectrum diagram is as shown in Figure 3 after third level frequency mixer for filtered signal, dash area is the passband (120 ~ 160MHz) of intermediate frequency Surface Acoustic Wave Filter, by filtered intermediate-freuqncy signal again through the mixing of fourth stage frequency mixer, again move back to original radio frequency band, now the signal of 1790 ~ 1830MHz by leaching out.
The actual filtering bandwidth of system is the lap of two filtered signals, i.e. 1805 ~ 1830MHz.
The utility model is not limited to above-mentioned execution mode; no matter do any change on its shape or material are formed; every employing structural design provided by the utility model, is all one distortion of the present utility model, all should thinks within the utility model protection range.
Claims (2)
1. the simulation repeater that can join of bandwidth chahnel, is characterized in that: the filter unit of the uplink downlink of described simulation repeater is made up of level Four frequency mixer and two-stage intermediate frequency Surface Acoustic Wave Filter, and first order frequency mixer and second level frequency mixer share a local oscillator LO
1, three-mixer and fourth stage frequency mixer share a local oscillator LO
2; Input radio frequency signal RF
1first undertaken being mixed down IF by first order frequency mixer
1, after the filtering of first order intermediate frequency sound table, by same local oscillator LO
1second level frequency mixer carry out being mixed down RF
2=RF
1, RF
2again by new local oscillator LO
2three-mixer carry out being mixed down IF
2, after the intermediate frequency sound table filtering of the second level, then by same local oscillator LO
2fourth stage frequency mixer carry out being mixed down RF
3=RF
2=RF
1, finally amplify output.
2. the simulation repeater that can join of bandwidth chahnel according to claim 1, is characterized in that: described two-stage intermediate frequency Surface Acoustic Wave Filter adopts same model filter, the centre frequency F of this model filter
c, bandwidth B; Described local oscillator LO
1lO is set
1=F
start-F
c+ B/2, local oscillator LO
2lO is set
2=F
stop-F
c-B/2, namely can realize bandwidth chahnel is F
stop-F
startfiltering, by change F
startor F
stopvalue namely can be real-time change filtering channel bandwidth.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420856749.1U CN204349987U (en) | 2014-12-30 | 2014-12-30 | The simulation repeater that a kind of bandwidth chahnel can be joined |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420856749.1U CN204349987U (en) | 2014-12-30 | 2014-12-30 | The simulation repeater that a kind of bandwidth chahnel can be joined |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN204349987U true CN204349987U (en) | 2015-05-20 |
Family
ID=53233224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420856749.1U Active CN204349987U (en) | 2014-12-30 | 2014-12-30 | The simulation repeater that a kind of bandwidth chahnel can be joined |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN204349987U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108323227A (en) * | 2017-03-02 | 2018-07-24 | 深圳市台电实业有限公司 | A kind of infrared receiving set and infrared simultaneous interpretation system |
-
2014
- 2014-12-30 CN CN201420856749.1U patent/CN204349987U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108323227A (en) * | 2017-03-02 | 2018-07-24 | 深圳市台电实业有限公司 | A kind of infrared receiving set and infrared simultaneous interpretation system |
| CN108323227B (en) * | 2017-03-02 | 2021-07-06 | 深圳市泰德创新科技有限公司 | Infrared receiver and infrared simultaneous interpretation system |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |