CN102523035B - Method and device for radio-frequency transmission of TDD (Time Division Duplex) switching signal - Google Patents
Method and device for radio-frequency transmission of TDD (Time Division Duplex) switching signal Download PDFInfo
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- CN102523035B CN102523035B CN201110421924.5A CN201110421924A CN102523035B CN 102523035 B CN102523035 B CN 102523035B CN 201110421924 A CN201110421924 A CN 201110421924A CN 102523035 B CN102523035 B CN 102523035B
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Abstract
The invention relates to a method and a device for radio-frequency transmission of a TDD switching signal, particularly to a TDD switching signal transmitting device of a radio-frequency remote system adopting ROF (Remote Optical Fiber) technique, which comprises an ROF unit (103), wherein the preceding stage of the ROF unit (103) is provided with an AM (Amplitude Modulation) modulation unit (101); the backward stage is provided with an envelope detection unit (102); the AM modulation unit (101) is used for modulating the TDD switching signal into a carrier electric signal and then transmitting the signal to the ROF unit (101) for transformation and remoting; the envelope detection unit (102) is used for performing envelope detection on the carrier electric signal restored from remoting and transformation and restoring the signal into the TDD switching signal; according to the invention, in the environment of using the ROF remoting technique, the TDD switching signal can be remotely transmitted by adding a simple modulation-demodulation unit and multiplexing the ROF unit, without adding extra cables, thereby realizing the effects of multiplexing channels, saving cables, and providing convenience for installation and use.
Description
Technical field
The present invention relates to a kind of method and apparatus of radio frequency transmission TDD switching signal, particularly a kind of transmitting device adopting the TDD switching signal of ROF technology radio frequency stretch system.
Background technology
Analog optical fiber is widely used in 3G communication, the mode that existing coverage mode many employings BBU+RRU combines, the common public radio interface of industry comparative maturity (CPRI) and open base station architecture is then adopted to originate the interconnected and intercommunication of alliance (OBSAI) Interface realization between BBU and RRU, the opening of two kinds of interface standards is done not deep enough, cause the product of different camps manufacturer to interconnect, virtually improve the cost of distributed base station.
Propose the mode of ROFMA on this basis, the combination of BBU and RRU adopts ROF unit to connect, and ROF cellular construction as shown in Figure 1, is made up of photoelectric conversion module, electrooptic conversion module and analog optical fiber.Adopt in a wireless communication system this ROF technology carry out networking can realize many systems, multi-user carrier signal multiplexing, the quantity of erecting optical cables can be reduced in a large number, reduce costs, and only there is PA in extension unit, the radio frequency units such as LNA, equipment volume and complexity reduce greatly, the advantages such as installation of being more convenient for.
There is plurality of advantages in the ROF technology that prior art is mentioned, but its very large shortcoming existed is exactly do not have the digital processing elements such as FPGA in extension unit RRU unit, only has analogue unit, therefrom cannot extract relevant TDD switching signal, cause TDD switching signal can not be transferred to RRU unit from BBU unit, in employing above-mentioned ROF technology and under needing the applied environment of TDD switching signal, carry out zooming out transmission TDD switching signal, just need to increase cable separately, be unfavorable for installing and using, add system complexity and system cost.
Summary of the invention
Goal of the invention of the present invention is: solve existing ROF technology can not transmit TDD switching signal problem when ROF zooms out, in order to solve the problem, the invention provides a kind of method and apparatus of radio frequency transmission TDD switching signal.
To achieve these goals, the technical solution used in the present invention is: a kind of device of radio frequency transmission TDD switching signal, comprise ROF unit, described ROF unit comprises electrooptic conversion module, analog optical fiber and photoelectric conversion module, electrooptic conversion module is in order to become radio frequency link light signal by radio frequency link converting electrical signal, send analog optical fiber to, analog optical fiber is in order to send radio frequency link light signal to photoelectric conversion module, photoelectric conversion module is in order to be reduced into the radio frequency link signal of telecommunication by radio frequency link light signal, described ROF unit prime is provided with AM modulating unit, rear class is provided with envelope detection unit, AM modulating unit in order to TDD switching signal is modulated into multi-carrier telecommunication number send to again ROF unit conversion zoom out, envelope detection unit is in order to carry out envelope detection by zooming out the multi-carrier telecommunication number after converting recovery and to be recovered to TDD switching signal.
Preferably, described AM modulating unit comprises AM modulator and local oscillator, and local oscillator is in order to generate multi-carrier telecommunication number, and AM modulator in order to TDD switching signal to be modulated on the multi-carrier telecommunication number of local oscillator, then sends electrooptic conversion module to.
Preferably, described envelope detection unit comprises envelope detector, low pass filter and comparator, envelope detection unit carries out envelope detection in order to the multi-carrier telecommunication number exported by photoelectric conversion module, low pass filter is outputted to again by this unit, low pass filter carries out low-pass filtering in order to the envelope signal sent the detection of envelope detection unit, low frequency signal is made to send comparator to, comparator, in order to the low frequency signal of low pass filtered and Vref level to be contrasted, is finally reduced into TDD switching signal.
A kind of method of radio frequency transmission TDD switching signal, TDD switching signal through AM modulators modulate on the multi-carrier telecommunication number of local local oscillator, by electrooptic conversion module, the multi-carrier telecommunication number after modulation is converted to light signal, light signal zooms out through analog optical fiber and is transferred to photoelectric conversion module and reverts to multi-carrier telecommunication number, multi-carrier telecommunication is number through envelope detector detection, again by low pass filter filtering un-necessary frequency component, carry out contrast judgement finally by comparator and Vref level and be reduced into TDD switching signal.
In sum, owing to have employed technique scheme, compared with prior art the invention has the beneficial effects as follows: under the environment that ROF technology zooms out, only need add simple modulating unit at BBU unit, adding simple demodulating unit at RRU unit, just TDD switching signal can being carried out zooming out transmission, without the need to increasing unnecessary cable by multiplexing ROF unit, conveniently install and use, save system cost.
Accompanying drawing explanation
Examples of the present invention will be described by way of reference to the accompanying drawings, wherein:
Fig. 1 is the schematic diagram of the ROF unit light transceiver module used in the present invention;
Fig. 2 is the schematic overview structure chart of a kind of radio frequency transmission TDD switching signal device in the present invention;
Fig. 3 is the schematic detailed structure view of a kind of radio frequency transmission TDD switching signal device in the present invention.
Embodiment
Below in conjunction with accompanying drawing, embodiments of the invention are described in further detail.
As shown in Fig. 1,2 and 3, the method and apparatus of a kind of radio frequency transmission TDD switching signal of the present embodiment,
A kind of device of radio frequency transmission TDD switching signal, comprise ROF unit 103, described ROF unit 103 comprises electrooptic conversion module 3, analog optical fiber 4 and photoelectric conversion module 5, electrooptic conversion module 3 is in order to become radio frequency link light signal by radio frequency link converting electrical signal, send analog optical fiber 4 to, analog optical fiber 4 is in order to send radio frequency link light signal to photoelectric conversion module 5, photoelectric conversion module 5 is in order to be reduced into the radio frequency link signal of telecommunication by radio frequency link light signal, described ROF unit 101 prime is provided with AM modulating unit 101, rear class is provided with envelope detection unit 102, AM modulating unit 101 in order to TDD switching signal is modulated into multi-carrier telecommunication number send to again ROF unit 101 conversion zoom out, envelope detection unit 102 is in order to carry out envelope detection by zooming out the multi-carrier telecommunication number after converting recovery and to be recovered to TDD switching signal.
According to embodiments of the invention, described AM modulating unit 101 comprises AM modulator 1 and local oscillator 2, and local oscillator 2 is in order to generate multi-carrier telecommunication number, and AM modulator 1 in order to TDD switching signal to be modulated on the multi-carrier telecommunication number of local oscillator 2, then sends electrooptic conversion module 3 to.
According to embodiments of the invention, described envelope detection unit 102 comprises envelope detector 8, low pass filter 7 and comparator 8, envelope detection unit 102 carries out envelope detection in order to the multi-carrier telecommunication number exported by photoelectric conversion module 5, low pass filter 7 is outputted to again by this unit, low pass filter 7 carries out low-pass filtering in order to the envelope signal sent envelope detection unit 102 detection, low frequency signal is made to send comparator 8 to, comparator 8, in order to the low frequency signal of low pass filter 7 low-pass filtering and Vref level to be contrasted, is finally reduced into TDD switching signal.
A kind of method of radio frequency transmission TDD switching signal, TDD switching signal is modulated on the multi-carrier telecommunication number of local local oscillator 2 through AM modulator 1, by electrooptic conversion module 3, the multi-carrier telecommunication number after modulation is converted to light signal, light signal zooms out through analog optical fiber 4 and is transferred to photoelectric conversion module 5 and reverts to multi-carrier telecommunication number, multi-carrier telecommunication is number through envelope detector 6 detection, again by low pass filter 7 filtering un-necessary frequency component, carry out contrast judgement finally by comparator 8 and Vref level and be reduced into TDD switching signal.
By the ROF unit 103 in multiplex system by modulation after radio signal transmission to extension unit.Which save the optical cable of transmission TDD switching signal, reduce the complexity of system, decrease hardware cost, adopt AM modulator 1 to be modulated in local oscillator by TDD switching signal, can ensure that modulation circuit is comparatively simple like this, adopt envelope detector 6 to carry out demodulation, can ensure that demodulator circuit is simple as far as possible like this, adopt low pass filter 7 pairs of multi-carrier telecommunication number to carry out filtering, get rid of the interference of unwanted signal component, adopt high-speed comparator 8 directly to carry out the judgement of thresholding.
In sum, the method and apparatus of a kind of radio frequency transmission TDD switching signal of the present invention, owing to have employed technique scheme, compared with prior art the invention has the beneficial effects as follows: the method and apparatus of a kind of radio frequency transmission TDD switching signal of the present invention, comparatively prior art, under the environment that ROF technology zooms out, only need add simple AM modulating unit 101 at BBU unit, simple demodulating unit such as envelope detection unit 102 is added at RRU unit, just TDD switching signal can be carried out zooming out transmission by multiplexing ROF unit 103, and without the need to increasing unnecessary transmission cable, conveniently install and use, save system cost.
This specification comprises arbitrary feature disclosed in any accessory claim, summary and accompanying drawing, unless specifically stated otherwise, all can be replaced by other equivalences or the alternative features with similar object.That is, unless specifically stated otherwise, each feature is an example in a series of equivalence or similar characteristics.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any amendments done within the spirit and principles in the present invention, equivalent replacement and improvement etc., all should be included within protection scope of the present invention.
Claims (2)
1. the device of a radio frequency transmission TDD switching signal, comprise ROF unit (103), described ROF unit (103) comprises electrooptic conversion module (3), analog optical fiber (4) and photoelectric conversion module (5), electrooptic conversion module (3) is in order to become radio frequency link light signal by radio frequency link converting electrical signal, send analog optical fiber (4) to, analog optical fiber (4) is in order to send radio frequency link light signal to photoelectric conversion module (5), photoelectric conversion module (5) is in order to be reduced into the radio frequency link signal of telecommunication by radio frequency link light signal, it is characterized in that, described ROF unit (101) prime is provided with AM modulating unit (101), rear class is provided with envelope detection unit (102), AM modulating unit (101) in order to TDD switching signal is modulated into multi-carrier telecommunication number send to again ROF unit (101) conversion zoom out, envelope detection unit (102) is in order to carry out envelope detection by zooming out the multi-carrier telecommunication number after converting recovery and to be recovered to TDD switching signal, described AM modulating unit (101) comprises AM modulator (1) and local oscillator (2), local oscillator (2) is in order to generate multi-carrier telecommunication number, AM modulator (1) in order to TDD switching signal to be modulated on the multi-carrier telecommunication number of local oscillator (2), then sends electrooptic conversion module (3) to, described envelope detection unit (102) comprises envelope detector, low pass filter (7) and comparator (8), envelope detector carries out envelope detection in order to the multi-carrier telecommunication number exported by photoelectric conversion module (5), low pass filter (7) is outputted to again by this unit, low pass filter (7) carries out low-pass filtering in order to the envelope signal sent envelope detector detection, low frequency signal is made to send comparator (8) to, comparator (8) is in order to contrast the low frequency signal of low pass filter (7) low-pass filtering and Vref level, finally be reduced into TDD switching signal.
2. one kind utilizes the method for the radio frequency transmission TDD switching signal of radio frequency transmission TDD switching signal device as claimed in claim 1, it is characterized in that, TDD switching signal is modulated on the multi-carrier telecommunication number of local local oscillator (2) through AM modulator (1), by electrooptic conversion module (3), the multi-carrier telecommunication number after modulation is converted to light signal, light signal zooms out through analog optical fiber (4) and is transferred to photoelectric conversion module (5) and reverts to multi-carrier telecommunication number, multi-carrier telecommunication is number through envelope detector (6) detection, again by low pass filter (7) filtering un-necessary frequency component, carry out contrast judgement finally by comparator (8) and Vref level and be reduced into TDD switching signal.
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| WO2008042312A1 (en) * | 2006-09-28 | 2008-04-10 | Corning Cable Systems Llc | Radio-over-fiber (rof) wireless picocellular system with combined picocells |
| CN101166068A (en) * | 2006-08-31 | 2008-04-23 | 三星电子株式会社 | Radio over fiber system and method for controlling transmission time |
| WO2010005414A1 (en) * | 2008-07-09 | 2010-01-14 | Corning Cable Systems Llc | Transponder systems and methods for radio-over-fiber (rof) wireless picocellular systems |
| CN101902318A (en) * | 2010-06-24 | 2010-12-01 | 广州飞瑞敖电子科技有限公司 | Bidirectional analog optical fiber transmission system with mixed WiFi and 3G signals |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101166068A (en) * | 2006-08-31 | 2008-04-23 | 三星电子株式会社 | Radio over fiber system and method for controlling transmission time |
| WO2008042312A1 (en) * | 2006-09-28 | 2008-04-10 | Corning Cable Systems Llc | Radio-over-fiber (rof) wireless picocellular system with combined picocells |
| WO2010005414A1 (en) * | 2008-07-09 | 2010-01-14 | Corning Cable Systems Llc | Transponder systems and methods for radio-over-fiber (rof) wireless picocellular systems |
| CN101902318A (en) * | 2010-06-24 | 2010-12-01 | 广州飞瑞敖电子科技有限公司 | Bidirectional analog optical fiber transmission system with mixed WiFi and 3G signals |
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Effective date of registration: 20200805 Address after: 610000 No.6 building, hi tech Incubation Park, north section of Tianfu Avenue, Chengdu, Sichuan Province Patentee after: CHENGDU NTS SOFTWARE Co.,Ltd. Address before: 610041, Sichuan high tech Zone, Chengdu Tianfu Road, South extension line, high-tech incubator Park, building 3, 6 Patentee before: CHENGDU NTS TECHNOLOGY Co.,Ltd. |