CN201717863U

CN201717863U - Cdma digital wireless repeater system

Info

Publication number: CN201717863U
Application number: CN201020218846XU
Authority: CN
Inventors: 雷礼平; 郭少彬; 何辉
Original assignee: Comba Telecom Systems China Ltd
Current assignee: Comba Network Systems Co Ltd
Priority date: 2010-06-08
Filing date: 2010-06-08
Publication date: 2011-01-19
Anticipated expiration: 2020-06-08

Abstract

The utility model relates to a CDMA digital wireless repeater system comprising a DT terminal duplexer, an MT terminal integrative duplexer, a donor antenna and a user antenna, wherein the donor antenna is connected with the DT terminal duplexer; the user antenna is connected with the MT terminal integrative duplexer; the system also comprises a digital radio frequency monitoring integrative module connected between the DT terminal duplexer and the MT terminal integrative duplexer, and an upstream and downstream integrative power amplification module connected between the DT terminal duplexer and the MT terminal integrative duplexer; and the digital radio frequency monitoring integrative module is connected with the upstream and downstream integrative power amplification module. The system can eliminate self-excitation interference, and has the advantages of small volume, high integrated level, simple design and easy installation and use.

Description

The CDMA digital radio repeater system

Technical field

The utility model relates to the direct discharging station design field, specifically is meant a kind of CDMA digital radio repeater system.

Background technology

Follow the develop rapidly of mobile communication cause, each operator requires also improving constantly to the covering of mobile network, and more low-cost as direct discharging station is pursued, structure is more convenient installation of trifle save space or the like more.As everyone knows, in cdma network, the self-excitation problem is the weakness that the wireless discharging-directly station engineering is used always, the conventional wireless repeater solves the self-excitation problem and mainly takes: increase the isolation of alms giver and retransmitting antenna, and as improving the directivity of donor antenna, the antenna of ratio before and after employing is high, when setting up, meticulously select the site and adjust dual-mode antenna towards, increase shelter, as install gauze screen additional, perhaps reduce measure such as repeater gain and solve.These measures at present often are used in combination, and in order to improve the isolation between the transmitting-receiving, make leakage signal be lower than input signal 15dB at least.The dual-mode antenna distance zooms out and is accompanied by the space expenses rising usually, and sets up the consuming time and difficult rising that causes installation cost.And fixing equipment installs surrounding environment change lacked adaptive capacity, if isolation is not high enough during installation, external environment condition changes and also can cause equipment self-excitation or communication quality to descend.

As shown in Figure 1, existing C DMA digital radio repeater belongs to the separate module product, it mainly is made of monitoring module, duplexer, LNA module, frequency-variable module, digital signal processing module, power amplifier module, power module, lithium battery, Modem etc., has drawbacks such as the cabinet volume is huger, technology is poor, integrated level is low, design is difficult, cost height; And do not possess and eliminate the function that self-excitation is disturbed, isolation between transmitting and receiving antenna is required than higher.

Summary of the invention

The purpose of this utility model is to overcome the shortcoming of prior art with not enough, a kind of CDMA digital radio repeater system is provided, this direct discharging station is monitored incorporate design based on digital RF, can eliminate self-excitation and disturb, have that volume is little, integrated level is high, simplicity of design, advantage such as be easy to install and use.

The purpose of this utility model is achieved through the following technical solutions: the CDMA digital radio repeater system, comprise that DT end duplexer, MT hold integrated duplexer, donor antenna and user antenna, donor antenna is connected with DT end duplexer, user antenna holds integrated duplexer to be connected with MT, comprise that also being connected DT end duplexer and MT holds digital RF monitoring integrated module between the integrated duplexer, be connected DT and hold duplexer and MT to hold the integrated power amplifier module of up-downgoing between the integrated duplexer; Digital RF monitoring integrated module and the integrated power amplifier module of up-downgoing interconnect.

Described digital RF monitoring integrated module comprises descending low noise amplifier, descending low-converter, descending A/D converter, baseband processing unit, descending D/A converter, the descending upconverter that connects successively, the up low noise amplifier of Lian Jieing, up low-converter, up A/D converter successively, interconnective up D/A converter, up upconverter, and the monitoring module that is used to monitor the work of digital RF monitoring integrated module; Up A/D converter, up D/A converter are connected with baseband processing unit respectively; Descending low noise amplifier is connected with DT end duplexer, and up low noise amplifier holds integrated duplexer to be connected with MT, and descending upconverter, up upconverter are connected with the integrated power amplifier module of up-downgoing respectively.

The integrated power amplifier module of described up-downgoing comprises descending power amplification module and ascending power amplification module; The descending power amplification module is connected with descending upconverter, and the ascending power amplification module is connected with up upconverter.

Described MT holds integrated duplexer to comprise interconnective MT end duplexer and following moving standing wave detecting unit.

The utility model has following advantage and effect with respect to prior art:

1, equipment adopts digital RF monitoring integrated design, can save the space that each module needs so greatly, reaches miniaturization, the easier design of satisfying operator to the equipment profile, and more convenient carrier network layout is installed with on-the-spot.

2, digital RF monitoring integrated module integrates digital module, radio-frequency module, monitoring, and incorporate like this design has significantly reduced cabling, and simple in structure being easy to installed and used, and heat dissipation problem has obtained better solution; Also reduce cost, can satisfy operator's requirement cheaply well.

3, possess the self-excitation of elimination interference function, can effectively reduce requirement isolation between transmitting and receiving antenna.

Description of drawings

Fig. 1 is the structural representation of the CDMA digital radio repeater system of existing separate module structure;

Fig. 2 is a structural representation of the present utility model.

Embodiment

Below in conjunction with embodiment and accompanying drawing the utility model is described in further detail, but execution mode of the present utility model is not limited thereto.

Embodiment

As shown in Figure 2, the utility model CDMA digital radio repeater system comprises that mainly digital RF monitoring integrated module, the integrated power amplifier module of up-downgoing, DT end duplexer, MT hold integrated duplexer, power module, lithium battery, donor antenna (being the DT antenna) and user antenna (being the MT antenna).Donor antenna is connected with DT end duplexer, user antenna holds integrated duplexer to be connected with MT, digital RF monitoring integrated module is connected DT end duplexer and MT holds between the integrated duplexer, the integrated power amplifier module of up-downgoing is connected DT end duplexer and MT holds between the integrated duplexer, and digital RF monitoring integrated module and the integrated power amplifier module of up-downgoing interconnect.MT holds integrated duplexer to comprise interconnective MT end duplexer and following moving standing wave detecting unit.

Described digital RF monitoring integrated module comprises descending low noise amplifier (LNA1), up low noise amplifier (LNA2), descending low-converter, descending upconverter, up upconverter, up low-converter, descending A/D converter, descending D/A converter, up A/D converter, up D/A converter, baseband processing unit, monitoring module.Descending low noise amplifier, descending low-converter, descending A/D converter, baseband processing unit, descending D/A converter, descending upconverter connect successively; Up low noise amplifier, up low-converter, up A/D converter, baseband processing unit, up D/A converter, up upconverter connect successively; Descending low noise amplifier is connected with DT end duplexer, and up low noise amplifier holds integrated duplexer to be connected with MT, and descending upconverter, up upconverter are connected with the integrated power amplifier module of up-downgoing respectively.Monitoring module is used to monitor the work of digital RF monitoring integrated module.

The integrated power amplifier module of described up-downgoing comprises descending power amplification module (PA2) and ascending power amplification module (PA1).The descending power amplification module is connected with descending upconverter, and the ascending power amplification module is connected with up upconverter.

The idiographic flow that the utility model uplink and downlink signal is handled is as follows: the downstream signal that sends from the base station is held duplexer filtering by DT successively after donor antenna receives, LNA1 amplifies, descending low-converter is handled the back radiofrequency signal and is transformed into intermediate-freuqncy signal, intermediate-freuqncy signal is after descending A/D converter sample, analog signal is transformed to digital signal, become baseband signal behind the digital signal process Digital Down Convert passage, the design digital filter carries out filtering to baseband signal, the unwanted part of filtering, construct simultaneously and the same image signal of importing by leakage of interference, in input signal, deduct image signal, reach interference signal and eliminate; Again with the baseband signal up-conversion, become analog if signal through descending D/A converter, by descending upconverter intermediate-freuqncy signal is changed into radiofrequency signal again, this radiofrequency signal is carried out signal by user antenna to the mobile subscriber at last and is covered through downlink power amplifier, duplexer.Mobile subscriber's signal is after the user antenna feed-in, pass through duplexer successively, up low noise amplifier LNA2, radiofrequency signal is transformed into intermediate-freuqncy signal behind the up low-converter, intermediate-freuqncy signal is after up A/D converter sample, analog signal is transformed to digital signal, digital signal becomes baseband signal through behind the different Digital Down Convert passages, the design digital filter carries out filtering to baseband signal, the unwanted part of filtering, construct simultaneously and the same image signal of importing by leakage of interference, in input signal, deduct image signal, reaching interference signal eliminates, again with the baseband signal up-conversion, become analog if signal through up D/A converter, by up up-conversion module intermediate-freuqncy signal is changed into radiofrequency signal again, this radiofrequency signal is through the ascending power amplifier, duplexer finally sends to the base station by donor antenna.

The foregoing description is the utility model preferred implementation; but execution mode of the present utility model is not restricted to the described embodiments; other any do not deviate from change, the modification done under spirit of the present utility model and the principle, substitutes, combination, simplify; all should be the substitute mode of equivalence, be included within the protection range of the present utility model.

Claims

1.CDMA digital radio repeater system, comprise that DT end duplexer, MT hold integrated duplexer, donor antenna and user antenna, donor antenna is connected with DT end duplexer, user antenna holds integrated duplexer to be connected with MT, it is characterized in that: comprise that also being connected DT end duplexer and MT holds digital RF monitoring integrated module between the integrated duplexer, be connected DT and hold duplexer and MT to hold the integrated power amplifier module of up-downgoing between the integrated duplexer; Digital RF monitoring integrated module and the integrated power amplifier module of up-downgoing interconnect.

2. CDMA digital radio repeater system according to claim 1, it is characterized in that: described digital RF monitoring integrated module comprises descending low noise amplifier, descending low-converter, descending A/D converter, baseband processing unit, descending D/A converter, the descending upconverter that connects successively, the up low noise amplifier of Lian Jieing, up low-converter, up A/D converter successively, interconnective up D/A converter, up upconverter, and the monitoring module that is used to monitor the work of digital RF monitoring integrated module; Up A/D converter, up D/A converter are connected with baseband processing unit respectively; Descending low noise amplifier is connected with DT end duplexer, and up low noise amplifier holds integrated duplexer to be connected with MT, and descending upconverter, up upconverter are connected with the integrated power amplifier module of up-downgoing respectively.

3. CDMA digital radio repeater system according to claim 2 is characterized in that: the integrated power amplifier module of described up-downgoing comprises descending power amplification module and ascending power amplification module; The descending power amplification module is connected with descending upconverter, and the ascending power amplification module is connected with up upconverter.

4. CDMA digital radio repeater system according to claim 1 is characterized in that: described MT holds integrated duplexer to comprise interconnective MT end duplexer and following moving standing wave detecting unit.