CN1458745A - Combined radio frequency transmit-receiving machine - Google Patents
Combined radio frequency transmit-receiving machine Download PDFInfo
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- CN1458745A CN1458745A CN02119755A CN02119755A CN1458745A CN 1458745 A CN1458745 A CN 1458745A CN 02119755 A CN02119755 A CN 02119755A CN 02119755 A CN02119755 A CN 02119755A CN 1458745 A CN1458745 A CN 1458745A
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Abstract
This invention relates to a RF transceiver capable of transferring two different bands signals, among which a signal of the first band can be delivered directly, signals of other bands are converted to the first band before transferred to the RF transceiver. This invention also discloses a method for converting signals by a combined Rf transceiver which by utilizing single RF transceiver, can transfer signals at least generated from two different bands, among which signals of the first band are transferred but not converted while signals in other bands are converted to the first band before transferred to the RF transceiver.
Description
Technical field
The present invention relates to a kind of combined radio frequency transmit-receiving machine, particularly finger and receive the signal of at least one frequency range and it is transformed into the transceiver of another frequency range, yet also be not limited thereto.
Background technology
Conventional transceiver is very small aperture terminal (" VSAT " s) for example, uses in the application of speech and data a lot of years.Their data rate comprises from low speed to the middling speed.And the radio-frequency (RF) transceiver of the IF interface of 70/140MHz (" RFT " s) was used in VSATs a lot of years.Because the rise of the Internet, it is abundanter that data communication becomes, thereby the demand of frequency band has also increased.And, VSAT market become with consumer be more the guiding rather than just to industrial purposes.This has promoted the reduction significantly of hardware cost.
Along with increasing demand of frequency band, the 70/140MHz system is transformed into the L band system.Utilize the L frequency band, have the advantage that can use whole 500MHz frequency bands, and utilize the 70/140MHz system, only having only, 36/72MHz (transceiver) can use.
The difficulty that present user is faced is that the L band system is introduced their network and continued the existing 70/140MHz of use system simultaneously.Even in the present wideband epoch, the demand of low data rate system is also arranged, for example, and voice network, management purposes, and network monitoring or the like.For these, still can use the 70/140MHz system, present solution is as shown in Figure 2.Wherein two independently system be incorporated into together at the antenna place, this antenna is a final stage.The major defect of this system is that for most of signal processing, these two systems are independently, thereby have increased cost significantly owing to the repetition of hardware.
Usually, when converting 70/140MHz to C frequency band or Ku frequency band, all RFTs use two frequency conversions.This means that 70/140MHz at first is converted into the L frequency band, then convert C or Ku frequency band to.This viewpoint is used for one group of unit is divided into two.
This also causes signal to be included in final stage loss afterwards, and this is the direct result of inefficient system.When two systems make up by this way, will cause the decay of 3dB, be equivalent to power and reduce by half.This will cause need more high-power RFTs, and this can increase the cost of equipment once more.Reason is that the RFTs among the VSAT accounts for major part in cost---account for 30% of total cost usually.
Thereby main purpose of the present invention provides a kind of system that two different systems's (for example, 70/140MHz and L frequency band) of frequency can be connected to same RFT.
Another object of the present invention provides a kind of system, and it can get up the signal combination in the different frequency bands, and wherein original system can be extended and can influence original system.
A further object of the invention provides a kind of system in order to combination different frequency bands signal, and wherein the end of going at antenna makes up, and the signal of combination is processed by other parts of system.
Summary of the invention
As shown in the above, a kind of combined radio frequency transmit-receiving machine provided by the invention, it utilizes the single radio frequency transceiver to transmitting from least two signals in different frequency bands, wherein the signal in first frequency band directly is transmitted, and the signal in the every other frequency band is switched to first frequency band, and then transmits.
Another on the one hand, the invention provides a kind of method that is used for the combined radio frequency transmit-receiving machine switching signal, this radio-frequency (RF) transceiver utilizes the single radio frequency transceiver to transmitting from the signal at least two different frequency bands, wherein the signal in first frequency band directly is transmitted, signal in the every other frequency band is switched to first frequency band, and then transmits.
For above transition form, first frequency band is the L frequency band, and second frequency band is 70/140 ± 18/36MHz intermediate frequency.This conversion can be undertaken by last/down-converter, this transducer can be transformed into second frequency band range from first frequency band range with the signal that receives, this signal that can be in first frequency band provides a kind of auxiliary port in reception and transmission end, and the signal that also can be in first frequency band provides independently gain controlling.Preferably use two frequency conversions and spectrum inversion is reduced to minimum.Transducer can comprise multiplexer, and it is in order to combine the signal of first frequency band and reference signal and direct voltage.And transducer can be set selecting first frequency band or second frequency band.
Description of drawings
The present invention is easier to be understood and is implemented in practice in order to make, below will be by a most preferred embodiment among the indefiniteness embodiment of the present invention, and illustrate with reference to the accompanying drawings and described, wherein:
Fig. 1 is the block diagram of system of the present invention;
Fig. 2 is the block diagram of system in the at present used prior art.
Embodiment
With reference to figure 1, the system shown in it has single RFT 10 and is used for all band systems, thereby can reduce cost.Wherein BUC represents up-conversion module (Block UP Converter), and LNB represents low noise block (Low Noise Block).In this system, L band signal 12 is in the scope of 950-1450MHz, and intermediate-freuqncy signal 14 is in 70/140 ± 18/36MHz scope, and the both is imported in the transducer 16 before RFT, and the output signal 18 of transducer 16 is transfused among the RFT 10.A RFT 10 can transmit signal and needn't consider the frequency range that they are original.Use this system, conversion for the first time is indoor, and conversion using L and RFT then finish outdoor for the second time.
On/down-converter 16 can effectively use with any L frequency band outdoor equipment, and have the required standard interface of L frequency band outdoor equipment.On/down-converter 16 can be by LCD from the soft key of the control panel of standard and easy operating and monitored.Also can on panel display, there be built-in testing apparatus to monitor the state of individual module in the transducer.
Provide frequency inverted at transmission end upconverter 16 from 70/140MHz to the L frequency band range.Two frequency conversions are used for making spectrum inversion to reduce to minimum.Be used for the outdoor required L frequency band of upconverter, the reference signal of DC and 10MHz is multiplex, and is positioned at the transmission output.This equipment can insert any C frequency band or Ku frequency band RF outdoor unit.
Receiving terminal receives the L frequency band input of 950-1450MHz MHz scope, and it is transformed into the intermediate frequency range of 70/140 ± 18/36MHz downwards.In addition, thus conversion downwards uses two frequency conversions that spectrum inversion (spectral inversion) is reduced to minimum.Receiving link can be connected with C frequency band or Ku frequency band LNB.L frequency band RF input port has direct voltage and the required 10MHz reference signal of LNB.
Though embodiment for example understand to use the intermediate frequency range of 70/140 ± 18/36MHz and the L frequency band range of 950-1450MHz MHz, on/down-converter 16 also can be used for any required frequency.This adjusting step-length can be 1MHz, and finishes by the independent frequency synthesizer.Can set by the panel LCD display.But the reference reference signal of frequency synthesizer is thermostatically controlled 10MHz reference oscillator.The stability of oscillator is 10
-9The order of magnitude.
The transmitting-receiving level of transducer 16 can be by having the digital pad control that 20dB changes.Attenuator is by the transmission on the panel and receive menu control.
Auxiliary L band port 20 inputs can receive the L band signal, and stop DC and the 10MHz signal that is produced by the L band system.At receiving terminal, the L band signal that transducer 16 receives from RFT, and be entered into demodulator.
L frequency band conversion device 16 can be in the transmission end/and receiving terminal places multiplexer.The major function of multiplexer is that L band signal, 10MHz signal, the DC power supply that will be positioned on the single port carry out multiple connection.In the transmission end, the signal of combination is input to the up-conversion module of C frequency band or Ku frequency band.At receiving terminal, insert the intermediate-freuqncy signal that C frequency band or Ku frequency band LNB can obtain 70/140 ± 18/36MHz.
The present invention has reduced cost by the signal in L frequency band stage combination different frequency scope than Previous System, and Previous System makes up thereby costs an arm and a leg because of finishing at C or Ku frequency band.
And, because system comprises single L frequency band RFT at output, thereby reduce quantity at the used device of indoor transfer phase.This has improved reliability of products.
Though described embodiments of the invention in the description in front, and can have been understood, yet can on the basis that does not exceed the scope of the invention, on design details, make many variations by those skilled in the art.
The present invention has covered all disclosed features in indivedual or all possible change and combination.
Claims (23)
1. combined radio frequency transmit-receiving machine that utilizes the single radio frequency transceiver, it can be transmitted in the signal that produces at least two kinds of different frequency bands, it is characterized in that: the signal in first frequency band is transmitted and is not converted, and the signal in other frequency bands was switched to first frequency band before being sent to radio-frequency (RF) transceiver.
2. combined radio frequency transmit-receiving machine VSAT as claimed in claim 1 wherein has two frequency bands, as the L frequency band and second frequency band of first frequency band.
3. combined radio frequency transmit-receiving machine VSAT as claimed in claim 2, wherein second frequency band is in the intermediate frequency range of 70/140 ± 18/36MHz.
4. combined radio frequency transmit-receiving machine VSAT as claimed in claim 2, wherein second frequency band is switched to first frequency band.
5. combined radio frequency transmit-receiving machine VSAT as claimed in claim 3, wherein second frequency band is switched to first frequency band.
6. combined radio frequency transmit-receiving machine VSAT as claimed in claim 2, wherein conversion is finished by last/down-converter, and this transducer also can be transformed into the received signal from first frequency band range second frequency band range.
7. combined radio frequency transmit-receiving machine VSAT as claimed in claim 1, wherein, for the signal of first frequency band on receiving terminal and transmission end provides auxiliary port.
8. combined radio frequency transmit-receiving machine VSAT as claimed in claim 1, wherein, for the signal in first frequency band provides independently gain controlling.
9. combined radio frequency transmit-receiving machine VSAT as claimed in claim 1, wherein, two frequency conversions are used for spectrum inversion is reduced to minimum.
10. combined radio frequency transmit-receiving machine VSAT as claimed in claim 6, wherein transducer comprises a multiplexer, uses so that all signals in first frequency band and reference signal and dc voltage signal combination.
11. combined radio frequency transmit-receiving machine VSAT as claimed in claim 5, wherein said transducer can be first frequency band and the required frequency band of second frequency band and set.
12. combined radio frequency transmit-receiving machine VSAT as claimed in claim 9, wherein said transducer can be first frequency band and the required frequency band of second frequency band and set.
13. method that is used for the combined radio frequency transmit-receiving machine switching signal, combined radio frequency transmit-receiving machine utilizes the single radio frequency transceiver, thereby can be transmitted in the signal that produces at least two kinds of different frequency bands, it is characterized in that: the signal in first frequency band is transmitted and is not converted, and the signal in other frequency bands was switched to first frequency band before being sent to radio-frequency (RF) transceiver.
14. method as claimed in claim 13 wherein has two frequency bands, as the L frequency band and second frequency band of first frequency band.
15. method as claimed in claim 14, wherein second frequency band is in the intermediate frequency range of 70/140 ± 18/36MHz.
16. method as claimed in claim 14, wherein second frequency band is switched to first frequency band.
17. method as claimed in claim 13, wherein conversion is finished by last/down-converter, and transducer also can be transformed into the received signal from first frequency band second frequency band.
18. method as claimed in claim 13, wherein, for the signal of first frequency band on receiving terminal and transmission end provides auxiliary port.
19. method as claimed in claim 13, wherein, for the signal in first frequency band provides independently gain controlling.
20. method as claimed in claim 13 wherein, utilizes two frequency conversions that spectrum inversion is reduced to minimum.
21. method as claimed in claim 17, wherein transducer comprises a multiplexer, uses so that all signals in first frequency band and reference signal and dc voltage signal combination.
22. method as claimed in claim 16, wherein said transducer at first are set in the required frequency band of first frequency band and second frequency band.
23. method as claimed in claim 20, wherein said transducer at first are set in the required frequency band of first frequency band and second frequency band.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02119755A CN1458745A (en) | 2002-05-17 | 2002-05-17 | Combined radio frequency transmit-receiving machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN02119755A CN1458745A (en) | 2002-05-17 | 2002-05-17 | Combined radio frequency transmit-receiving machine |
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| Publication Number | Publication Date |
|---|---|
| CN1458745A true CN1458745A (en) | 2003-11-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN02119755A Pending CN1458745A (en) | 2002-05-17 | 2002-05-17 | Combined radio frequency transmit-receiving machine |
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| CN (1) | CN1458745A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105933028A (en) * | 2016-06-13 | 2016-09-07 | 深圳市华讯方舟卫星通信有限公司 | Transceiver of Ka band very small aperture terminal |
-
2002
- 2002-05-17 CN CN02119755A patent/CN1458745A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105933028A (en) * | 2016-06-13 | 2016-09-07 | 深圳市华讯方舟卫星通信有限公司 | Transceiver of Ka band very small aperture terminal |
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