CN201054589Y - A radio frequency-selective repeater - Google Patents
A radio frequency-selective repeater Download PDFInfo
- Publication number
- CN201054589Y CN201054589Y CNU2007200033829U CN200720003382U CN201054589Y CN 201054589 Y CN201054589 Y CN 201054589Y CN U2007200033829 U CNU2007200033829 U CN U2007200033829U CN 200720003382 U CN200720003382 U CN 200720003382U CN 201054589 Y CN201054589 Y CN 201054589Y
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- frequency
- selecting
- module
- selecting module
- frequency selecting
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Abstract
The utility model relates to a wireless frequency selecting repeater station, which includes a sponsor antenna, an user antenna, a duplexer, a downlink low-noise magnifier, a downlink power magnifier, a bridge, an uplink low-noise magnifier, an uplink power magnifier, a power source module and a frequency selecting module; wherein, the frequency selecting module consists of an uplink frequency selecting module and a downlink frequency selecting module. Both the uplink frequency selecting module and the downlink frequency selecting module adopt the carrier wave frequency selecting method to select the frequency. Each frequency selecting consists of a band-pass filter, a frequency mixer, an intermediate frequency amplifier and an intermediate frequency. The utility model is applicable for the signal coverage of CDMA 800 MHz mobile communication system, no harmful interference is caused to the previously built and operated GSM 900MHz and DCS1800MHz systems.
Description
Technical field
The utility model relates to a kind of Wireless Telecom Equipment that is used for CDMA mobile communication system uplink and downlink signal is carried out two-way frequency-selecting, power amplification, same frequency forwarding.
Background technology
Since this century the eighties, GSM900MHz, DCS1800MHz mobile communication system are in extensive use all over the world, and China user has reached 1.5 hundred million families at present.Along with the develop rapidly of mobile communication technology and the growth of traffic carrying capacity, a kind of new mobile communications network CDMA800MHz mobile radio communication begins to occur, the CDMA800MHz mobile communication system is to be shared the multi-address connecting mode of carrier frequency channel by a plurality of Code Channels, compares CDMA frequency efficiency height with DCS with GSM, required base station number is few, transmitting power is little, and speech quality is good, strong security, coverage effect is good, thereby cdma network has good market prospects.
But, because China's mobile communication is that many nets are laid equal stress on, how tame operator and the system of depositing, how solving crosstalking mutually between the signal becomes technical barrier.As shown in Figure 1 be CDMA, GSM, the shared working frequency range of DCS three big mobile communication system.As can be seen from Figure 1, CDMA800MHz system descending frequency range is 870-880MHz, and GSM900MHz system uplink frequency range is 885-915MHz, has only 5MHz protection frequency band therebetween.Present wireless frequency selecting repeater reckoned without afterwards when design will build the CDMA net, therefore at that time to the inhibition degree requirement with outer unwanted signal, can not effectively prevent the interference of CDMA800MHz system unwanted signal.And the selectivity of frequency selection method is relatively poor, can not prevent the interference of CDMA signal to GSM, DCS system effectively.Therefore newly-built cdma network comprises base station and repeater, must adopt the otherwise effective technique measure, prevents the interference of its unwanted signal to GSM, DCS system.
The utility model content
The purpose of this utility model provides a kind of CDMA signal of can effectively eliminating to the GSM900MHz system that builds up operation and the wireless frequency selecting repeater of DCS1800MHz system interference.
The technical solution of the utility model is achieved in that wireless frequency selecting repeater, comprise donor antenna, user antenna, duplexer, descending low noise amplifier, downlink power amplifier, electric bridge, up low noise amplifier, ascending power amplifier, power module and frequency-selecting module, described frequency-selecting module comprises up frequency-selecting module and down frequency selection module, and described up frequency-selecting module and down frequency selection module adopt the frequency-selecting of carrier wave frequency selection method.Described frequency-selecting module is by band pass filter, frequency mixer, and intermediate frequency amplifier and intermediate-frequency filter are formed.
As to further improvement of the utility model, the bandwidth of operation of described band pass filter is 870-880MHz, and the centre frequency of intermediate-frequency filter is 114.99MHz, and width is 1.23MHz.
Include mixing, filter circuit in down frequency selection module in the frequency-selecting module and the up frequency-selecting module.Frequency mixer carries out frequency translation according to required frequency, and filter is selected useful signal, suppresses unwanted signal, adopts the filter serial arrangement, and band is outer to be suppressed more than the Du Keda 60dB.
As to further improvement of the utility model, described frequency-selecting module can be connected in series by two-stage or multistage identical carrier wave frequency selection circuit.Adopt multistage carrier wave frequency selection circuit, can more effectively suppress unwanted signal, reach the inhibition degree higher unwanted signal.
The signal that the utility model is used for the CDMA800MHz mobile communication system covers, and can not produce any harmful interference to GSM900MHz, the DCS1800MHz system that builds up operation before.
Description of drawings
Fig. 1 CDMA800MHz, GSMMHz, DCS1800MHz mobile communication system working frequency range
Fig. 2 the utility model functional-block diagram
Fig. 3 the utility model down frequency selection module (05) functional-block diagram
Embodiment
As shown in Figure 2, the functional-block diagram of wireless frequency selecting repeater, its basic functional principle is: base station (01) downstream signal (870-880MHz) that is received from the space by donor antenna (02) enters downstream branch through duplexer (03) high pass, at first pass through descending low noise amplifier (04) amplification and shunt, carry out carrier wave frequency-selecting and downlink power amplifier (06) power amplification by down frequency selection module (05) again, close road and duplexer (08) high pass through 3dB electric bridge (07) two carrier frequency, be emitted to travelling carriage (10) by user antenna (09) at last.In like manner, the upward signal (825-835MHz) of travelling carriage (10) emission, receive from the space by user antenna (09), after duplexer (08) low pass, amplify, along separate routes by up low noise amplifier (11), again by up frequency-selecting module (12) carry out carrier wave frequency-selecting and ascending power amplifier (13) power amplification, two carrier waves close the road, through duplexer (03) low pass, send back base station (01) through the space by donor antenna (02) at last.
First order carrier circuit is by band pass filter (15,20), frequency mixer (16), and intermediate frequency amplifier (17,19) and intermediate-frequency filter (18) are formed.The bandwidth of operation of band pass filter (15,20) is 870-880MHz, just in time allows the downlink working frequency band to pass through, and stops the outer unwanted signal of band to pass through.Frequency mixer (16) is transformed to intermediate frequency earlier according to the required carrier channel of choosing, and restores into the primary carrier channel frequency after intermediate-frequency filter (18) is chosen.The centre frequency of intermediate-frequency filter is 114.99MHz, and width is 1.23MHz, just in time chooses a carrier channel.The effect of intermediate frequency amplifier (17,19) is the power loss that compensating band bandpass filter (15,20) and intermediate-frequency filter (18) are brought.
The carrier to second order frequency selection circuit and the first order are identical, no longer are repeated in this description.
Evidence adopts the wireless frequency selecting repeater of present embodiment can not cause harmful interference to GSM900MHz system and the DCS1800MHz system that has built up operation before, is with outer spurious emissions level must satisfy the limit value requirement of state administration authorities regulation.
The technical scheme that present embodiment adopts simultaneously also has: donor antenna (02) adopt minor beam (30-60 °), high-gain (＞18dBi), high before and after than (＞25dB) directed plate antenna; Downlink power amplifier (06) adopts the feedforward intermodulation to offset mode, realizes high power, low distortion.Adopt output level automatic control technology (ALC) simultaneously, prevent that the power output overrate from causing the serious distortion of signal.
Claims (4)
1. wireless frequency selecting repeater, comprise: donor antenna (02), user antenna (09), duplexer (03,08), descending low noise amplifier (04), downlink power amplifier (06), electric bridge (07), up low noise amplifier (11), ascending power amplifier (13), power module (14) and frequency-selecting module, it is characterized in that: described frequency-selecting module comprises up frequency-selecting module (12) and down frequency selection module (05), and described up frequency-selecting module (12) and down frequency selection module (05) adopt the frequency-selecting of carrier wave frequency selection method.
2. wireless frequency selecting repeater according to claim 1, it is characterized in that, described frequency-selecting module is by band pass filter (15,20), frequency mixer (16), intermediate frequency amplifier (17,19) and intermediate-frequency filter (18) are formed, the bandwidth of operation of band pass filter (15,20) is 870-880MHz, and the centre frequency of intermediate-frequency filter is 114.99MHz, and width is 1.23MHz.
3. wireless frequency selecting repeater according to claim 1 is characterized in that: described frequency-selecting module is connected in series by two-stage or multistage identical carrier wave frequency selection circuit.
4. wireless frequency selecting repeater according to claim 1 is characterized in that, described donor antenna (02) is directed plate antenna, adopts 30-60 ° of wave beam, gains greater than 18dBi, front and back ratio greater than 25dB.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200033829U CN201054589Y (en) | 2007-02-08 | 2007-02-08 | A radio frequency-selective repeater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2007200033829U CN201054589Y (en) | 2007-02-08 | 2007-02-08 | A radio frequency-selective repeater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201054589Y true CN201054589Y (en) | 2008-04-30 |
Family
ID=39394247
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2007200033829U Expired - Fee Related CN201054589Y (en) | 2007-02-08 | 2007-02-08 | A radio frequency-selective repeater |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201054589Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684733A (en) * | 2012-05-04 | 2012-09-19 | 西安亿力通微波科技有限公司 | Dual-network bidirectional orthogonal power synthesis system |
-
2007
- 2007-02-08 CN CNU2007200033829U patent/CN201054589Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102684733A (en) * | 2012-05-04 | 2012-09-19 | 西安亿力通微波科技有限公司 | Dual-network bidirectional orthogonal power synthesis system |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| 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: 20080430 Termination date: 20110208 |