CN102457291A - Front-end frequency selection circuit in home NodeB - Google Patents
Front-end frequency selection circuit in home NodeB Download PDFInfo
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- CN102457291A CN102457291A CN2010105143925A CN201010514392A CN102457291A CN 102457291 A CN102457291 A CN 102457291A CN 2010105143925 A CN2010105143925 A CN 2010105143925A CN 201010514392 A CN201010514392 A CN 201010514392A CN 102457291 A CN102457291 A CN 102457291A
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Abstract
According to the invention, a technological scheme is that an antenna reception radio frequency front end in a home NodeB system is provided. According to the provided antenna reception radio frequency front end, a switch circuit and a filter at the rear end of an antenna is intelligently controlled by PC software; and gating is carried out on electromagnetic waves to filer and remove signals that are not needed, so that a preselection function on signals is realized. For an FDD system, pairs of receiving and sending frequencies must be used, so that frequency spectrums of an uplink and a downlink can be fully utilized when a symmetrical service is supported; however, when an unsymmetrical data exchanging service is carried out, the utilization rate of the frequency spectrums is substantially reduced and accounts for 60% of the utilization rate during the symmetrical service process. It is required that the RX frequency and the TX frequency can be inverted; for a TDD system, an uplink and a downlink work at same frequency and consistency of electric wave transmission enables the TDD system to be suitable for application to an intelligent antenna technology; because the intelligent antenna has an adaptive wave beam forming function, multipath interferences can be effectively reduced and equipment reliability can be improved. However, if an FDD system with a certain frequency range interval is employed for receiving and sending, it is difficult to employ the above-mentioned technology. Meanwhile, the intelligent antenna technology requires utilization of a plurality of small power linear power amplifiers to replace a single large power linear amplifier; and the prices of the small power linear power amplifiers are much lower than the price of the single large power linear amplifier. According to calculations, costs of base station equipment of the TDD system are lower than costs of the base station of the FDD system by about 20% to 50%; and it is required that switching of the RX and the TX can be inverted any time.
Description
Technical field
The present invention relates to a kind of radio-frequency front-end of Home eNodeB, specially refer to the antenna handoff procedure of this front end.
Background technology
The radio-frequency front-end of Home eNodeB realizes that mainly function is that the signal that is received is carried out frequency-selecting; There is a large amount of spurious signals to affect the normal communication of Home eNodeB in the space; Good radio-frequency front-end is the filtering unwanted signal effectively, makes the useful signal complete radio frequency leading portion that passes through of trying one's best.Present Home eNodeB radio band on the market all is fixing several frequency ranges, and being difficult to present upward all standards of realization can both receive, and the present invention can be through realizing the communication mode that multi-modulation scheme coexists to the replacing of front end device and the switching of switch.
Summary of the invention
Antenna receiving radio frequency front end in a kind of family base station system is characterized in that: through the switching circuit and the filter of PC software Based Intelligent Control antenna rear end, system comprises replaceable passive microwave assembly, rear software control module.
The passive microwave assembly is controlled switching by microcomputer.Wherein multiplexer and power splitter are the microwave devices of developing under the suspended mictrostrip technology, and it is little to have a volume, advantages such as light weight.
The multiplexer of these replaceable different indexs of system and power splitter are realized the reception to obstructed frequency band signals.
Technical problem of the present invention is that the receiving radio frequency front end of the antenna in a kind of family base station system will be provided; It is characterized in that: through the switching circuit and the filter of PC software Based Intelligent Control antenna rear end; Electromagnetic wave is carried out gating, the filtering unwanted signal, thus reach the preliminary election function of signal; For the system of FDD, must use paired transmitting-receiving frequency.When supporting symmetrical service, can make full use of the frequency spectrum of up-downgoing, but when carrying out asymmetrical data exchange service, the utilance of frequency spectrum reduces greatly then, 60% when being about symmetrical service.Require RX and TX frequency to be inverted, for the system of TDD, uplink and downlink work in same frequency; The consistency of its electric wave transmission makes it to be suitable for using very much intelligent antenna technology; Through the adaptive wave beam shaping that smart antenna has, can effectively reduce multipath and disturb, improve the reliability of equipment.Sending and receiving adopt certain frequency range FDD system at interval then to be difficult to adopt above-mentioned technology.Simultaneously, intelligent antenna technology requires to adopt a plurality of low power linear power amplifiers to replace single high-power linear amplifier, and its price is far below single high-power linear amplifier.According to measuring and calculating, the base station equipment cost of TDD system is low more about 20%～50% than the base station cost of FDD system, requires RX and TX switching to be inverted constantly.
The radio-frequency front-end design of this communication base station; It is characterized in that through multiplexer and switch being switched multiple signals and realizing the function that the transmitting-receiving two-way switches; Make FDD and TDD carry out obstructed configuration, realize that FDD and TDD co-exist in the base station according to different demands. in this front end, its main devices multiplexer and power splitter are the microwave devices of developing under the suspended mictrostrip technology; It is little to have volume, advantages such as light weight.
Description of drawings:
The module placement figure of the base station radio-frequency front end that Fig. 1 realizes for the multiplexer mode
The module placement figure of the base station radio-frequency front end that Fig. 2 realizes for the power splitter mode
Fig. 3 is the pictorial diagram of multiplexer and power splitter
Fig. 4 is the performance index figure of multiplexer and power splitter
Specific embodiments
As shown in Figure 1, Fig. 1 is based on the module placement figure of the base station radio-frequency front end of multiplexer, and this invention is made up of following several parts; Signal gets into radio-frequency front-end through broad-band antenna, and multiplexer carries out the shunt of obstructed frequency range to signal, and F1 to Fm is the filter of multichannel; Multi-band signal carries out filtering; Filtered signal gets into FDD duplex and TDD switch respectively, transmitting-receiving when the FDD duplex has realized signal, and the TDD switch has been realized the switching of transmitting-receiving two-way.Signal gets into switches set afterwards, gets into LNA then signal is amplified.Among Fig. 2, signal is through being divided into two-way through power splitter with signal in the antenna entering system, and one the tunnel gives TDD for FDD one tunnel.Through switches set and bank of filters signal is switched simultaneously, realized equally signal packets is amplified.System among two figure can realize that all radio-frequency front-end supports FDD and TDD simultaneously, has bigger autgmentability than general Home eNodeB.
The multiplexer that uses in this system for the suspended mictrostrip multiplexer, according to different demands, can be made the multiplexer of different frequency range, realizes different types of communication.The index of this multiplexer is following:
Frequency range (Frequency Range): DC～18GHz (can expand to 26.5GHz)
Part-frequency point scope (Crossover Frequency Range): 0.5～16GHz
Passband inserts loss (Passband Insertion Loss):＜1dB
Part-frequency point inserts loss (Crossover Frequency I.L.):＜5dB
Isolate between passband (Selectivity):＞60dB within 10～15% of crossoverfrequency
Temperature range (Temperature Range) :-55to+85deg.C.
Claims (3)
1. the antenna receiving radio frequency front end in the family base station system, it is characterized in that: through the switching circuit and the filter of PC software Based Intelligent Control antenna rear end, system comprises replaceable passive microwave assembly, rear software control module.
2. according to the design of the radio-frequency front-end of the described a kind of communication base station of claim 1, it is characterized in that the passive microwave assembly controls switching by microcomputer.Wherein multiplexer and power splitter are the microwave devices of developing under the suspended mictrostrip technology, and it is little to have a volume, advantages such as light weight.
3. according to the radio-frequency front-end design of the described a kind of communication base station of claim 1, it is characterized in that the multiplexer and the power splitter of replaceable different indexs, realize reception obstructed frequency band signals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105143925A CN102457291A (en) | 2010-10-21 | 2010-10-21 | Front-end frequency selection circuit in home NodeB |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010105143925A CN102457291A (en) | 2010-10-21 | 2010-10-21 | Front-end frequency selection circuit in home NodeB |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102457291A true CN102457291A (en) | 2012-05-16 |
Family
ID=46040036
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010105143925A Pending CN102457291A (en) | 2010-10-21 | 2010-10-21 | Front-end frequency selection circuit in home NodeB |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102457291A (en) |
-
2010
- 2010-10-21 CN CN2010105143925A patent/CN102457291A/en active Pending
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120516 |