CN202009494U - Digital enclave system compatible with CDMA network - Google Patents
Digital enclave system compatible with CDMA network Download PDFInfo
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- CN202009494U CN202009494U CN2011200074806U CN201120007480U CN202009494U CN 202009494 U CN202009494 U CN 202009494U CN 2011200074806 U CN2011200074806 U CN 2011200074806U CN 201120007480 U CN201120007480 U CN 201120007480U CN 202009494 U CN202009494 U CN 202009494U
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- enclave system
- base station
- digital
- digital enclave
- end machine
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Abstract
The utility model discloses a digital enclave system compatible with CDMA network, comprising a near-end machine, a remote terminal and a CDMA base station, wherein the near-end machine is connected with the remote terminal via wireless signals, and the near-end machine comprises two duplexers, two low-noise amplifiers, a forward intermediate frequency frequency shift unit, a combiner, a forward power amplifier and a reverse intermediate frequency frequency shift unit. In the digital enclave system, digital technology is adopted from duplex filtering to power amplifier output, thus, conversation quality is improved, and noise suppression capability of the system is improved. The CDMA base station is connected with a down duplex of the digital enclave system via a coupler, also the CDMA base station can be connected with the down duplex through a wireless channel, being compatible with the CDMA network.
Description
Technical field
The utility model relates to a kind of digital communication system, relates in particular to a kind of digital enclave system of compatible cdma network.
Background technology
The enclave system, it is a kind of system that carries out long-distance transmissions in the narrower low frequency frequency range of frequency band that the bigger signal of communication of occupied bandwidth is compressed to, the compression of employing near-end, far-end connects the mode that expands reduction, carry out covering behind the linear amplification, be mainly used in the signal problem in the areas such as mountain village, factories and miness or one-shot job district that intercept away from cities and towns, by mountain.But existing enclave system exists a lot of not enough:
1. speech quality is poor, and the duplexing filtering of traditional enclave system is all adopted analogue technique to power amplifier output, is uneven square wave after the filtering, causes the signal noise height, the problem of area of coverage speech quality difference;
2. frequency-selecting weak effect, traditional enclave system adopts the simulation frequency-selective system, just must increase a large amount of hardware in order to realize multichannel, and the consistency of sound table device is difficult to guarantee;
3. the system noise sound pitch is difficult to realize that one drags susceptible condition, because of traditional enclave system adopts analog form, thereby, cause the noise of equipment height from the filter that shift frequency all adopts the rectangle difference that extracts of signal, multiple devices stack back noise is big, and one of serious limiting device drags use more;
4. network compatibility is poor, and traditional enclave system can not good compatible cdma network.
Summary of the invention
At the problem that above-mentioned prior art exists, the purpose of this utility model just is to provide a kind of speech quality height, and frequency-selecting is effective, can be used for the digital enclave system of the compatible cdma network of cdma network.
To achieve these goals, the technical solution adopted in the utility model is: a kind of digital enclave system of compatible cdma network, comprise near-end machine, remote termination, described near-end machine and remote termination pass through communicating wireless signals, also comprise cdma base station, described near-end machine comprises two duplexers, two low noise amplifiers, forward direction intermediate frequency shift frequency unit, mixer, forward direction power amplifier and reverse intermediate frequency shift frequency unit;
Connect by the uplink and downlink link between described two duplexers, down link by low noise amplifier, forward direction intermediate frequency shift frequency unit, mixer, forward direction power amplifier by side signal transmission to being connected in sequence, up link by low noise amplifier, oppositely intermediate frequency shift frequency unit by side signal transmission to being connected in sequence.
Described cdma base station is connected by the descending duplexer of coupler with digital enclave system.
As preferably: described cdma base station replaces the two to pass through the coupler ways of connecting by the descending duplexer ways of connecting of wireless channel and digital enclave system.
As preferably: also comprise power module, described power module provides electric energy for each unit.
Compared with prior art, advantage of the present utility model is: duplexing filtering is to the full digital technology that adopts of power amplifier output, improved speech quality, improved the noise inhibiting ability of system, cdma base station is connected by the descending duplexer of coupler with digital enclave system; Cdma base station can also be connected with descending duplexer by wireless channel, can compatible cdma network.
Description of drawings
Fig. 1 is a kind of structural representation of the present utility model;
Fig. 2 is an another kind of structural representation of the present utility model;
Fig. 3 is the theory diagram of the utility model near-end machine.
Among the figure: 1, cdma base station; 2, near-end machine; 3, remote termination; 4, near-end transmitting antenna; 5, far-end reception antenna; 6, far-end transmitting antenna.
Embodiment
The utility model is described in further detail below in conjunction with accompanying drawing.
Embodiment: consult Fig. 1, the utility model comprises near-end machine 2, remote termination 3, described near-end machine 2 passes through communicating wireless signals with remote termination 3, also comprise cdma base station 1, described near-end machine 2 comprises two duplexers, two low noise amplifiers, forward direction intermediate frequency shift frequency unit, mixer, forward direction power amplifier and reverse intermediate frequency shift frequency unit;
Connect by the uplink and downlink link between described two duplexers, down link by low noise amplifier, forward direction intermediate frequency shift frequency unit, mixer, forward direction power amplifier by side signal transmission to being connected in sequence, up link by low noise amplifier, oppositely intermediate frequency shift frequency unit by side signal transmission to being connected in sequence.
Described cdma base station 1 can be connected by the descending duplexer of coupler with digital enclave system.
Described cdma base station 1 also can be connected by the descending duplexer of wireless channel with digital enclave system.
Also comprise power module, described power module provides electric energy for each unit.
In actual use, cdma base station 1 is connected by the descending duplexer of wireless channel with digital enclave system near-end machine 2, signal is through near- end machine 2,4 emissions of near-end transmitting antenna, far-end reception antenna 5 by remote termination 3 receives again, through remote termination 3,6 emissions of far-end transmitting antenna, carry out signal and cover effective compatible cdma network.
Another kind of embodiment, except that cdma base station 1 by coupler with the descending duplexer of near-end machine 2 is connected, all the other are with above-mentioned embodiment.
Claims (3)
1. the digital enclave system of a compatible cdma network, comprise near-end machine, remote termination, described near-end machine and remote termination pass through communicating wireless signals, it is characterized in that: also comprise cdma base station, described near-end machine comprises two duplexers, two low noise amplifiers, forward direction intermediate frequency shift frequency unit, mixer, forward direction power amplifier and reverse intermediate frequency shift frequency unit;
Connect by the uplink and downlink link between described two duplexers, down link by low noise amplifier, forward direction intermediate frequency shift frequency unit, mixer, forward direction power amplifier by side signal transmission to being connected in sequence, up link by low noise amplifier, oppositely intermediate frequency shift frequency unit by side signal transmission to being connected in sequence;
Described cdma base station is connected by the descending duplexer of coupler with digital enclave system.
2. the digital enclave system of compatible cdma network according to claim 1 is characterized in that: described cdma base station replaces the two to pass through the coupler ways of connecting by the descending duplexer ways of connecting of wireless channel and digital enclave system.
3. the digital enclave system of compatible cdma network according to claim 1 is characterized in that:
Also comprise power module, described power module provides electric energy for each unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200074806U CN202009494U (en) | 2011-01-12 | 2011-01-12 | Digital enclave system compatible with CDMA network |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200074806U CN202009494U (en) | 2011-01-12 | 2011-01-12 | Digital enclave system compatible with CDMA network |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN202009494U true CN202009494U (en) | 2011-10-12 |
Family
ID=44751145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011200074806U Expired - Fee Related CN202009494U (en) | 2011-01-12 | 2011-01-12 | Digital enclave system compatible with CDMA network |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN202009494U (en) |
-
2011
- 2011-01-12 CN CN2011200074806U patent/CN202009494U/en not_active Expired - Fee Related
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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: 20111012 Termination date: 20120112 |