CN101882950A - WIMAX radio frequency far end system supporting MIMO - Google Patents
WIMAX radio frequency far end system supporting MIMO Download PDFInfo
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- CN101882950A CN101882950A CN2009100392647A CN200910039264A CN101882950A CN 101882950 A CN101882950 A CN 101882950A CN 2009100392647 A CN2009100392647 A CN 2009100392647A CN 200910039264 A CN200910039264 A CN 200910039264A CN 101882950 A CN101882950 A CN 101882950A
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Abstract
The invention discloses a WIMAX radio frequency far end system supporting MIMO, which comprises at least two channels, wherein each channel comprises a cavity filter, a low noise and power amplification unit, a frequency conversion unit, a digital-to-analogue conversion unit, a field programmable gate array unit, a serial-to-parallel conversion unit and an electronic-to-optical transduction unit; one end of the cavity filter is connected with an antenna, while the other end is connected with one end of the electronic-to-optical transduction unit through the low noise and power amplification unit, the frequency conversion unit, the digital-to-analogue conversion unit, the field programmable gate array unit and the serial-to-parallel conversion unit in turn; and the other end of the electronic-to-optical transduction unit is connected with an indoor baseband processing unit. In the invention, the WIMAX radio frequency far end system can work at different frequency bands by changing the cavity filter, so the production cost is reduced; and the channel bandwidth of the WIMAX radio frequency far end system can be changed by arranging the field programmable gate array unit, and a user can arrange the field programmable gate array unit flexibly according to needs.
Description
Technical field
The present invention relates to moving communicating field, relate in particular to the WIMAX radio frequency far end system of a kind of MIMO of support.
Background technology
In the middle of the mobile communication technology development at full speed, as far back as in October, 2007, ITU (International Telegraph Union, International Telecommunications Union) just announces approval WIMAX (Worldwide Interoperability for Microwave Access, the worldwide interoperability for microwave access) becomes the ITU mobile radio standard, this means that also WIMAX has been a full member in the 3G (Third Generation) Moblie standard by official approval, become global the fourth-largest 3G standard, so the research and development of WIMAX base station also seem particularly important to each manufacturer.
MIMO (Multiple-Input Multiple-Out-put, multiple-input and multiple-output) technology can improve capability of communication system, the availability of frequency spectrum and can improve data transmission rate.Present WIMAX radio frequency far end system of the prior art mostly is single antenna equipment, the MIMO technology supported is seldom arranged, promptly enable to support the MIMO technology, can not carry out easy configuration by the user and can realize that the WIMAX radio frequency far end system is operated in the function of different operating frequency range but do not have; And the channel width of WIMAX radio frequency far end system of the prior art is fixed, do not support multiple channel width, if use the WIMAX radio frequency far end system just to need the WIMAX radio frequency far end system of a plurality of different channels bandwidth, concerning the user, improved production cost in zones of different, different period.
Summary of the invention
The invention provides the WIMAX radio frequency far end system of a kind of MIMO of support, it carries out the function that easy configuration can realize being operated in the different operating frequency range, and can reduce user's production cost.
Technical scheme of the present invention is: the WIMAX radio frequency far end system of a kind of MIMO of support, comprise at least two passages, each passage comprises: cavity body filter, LNA and power amplifier unit, converter unit, D/A conversion unit, field programmable gate array unit, string and converting unit and electrooptic switching element;
One end of described cavity body filter is connected with antenna, and the other end is connected by the end of LNA with power amplifier unit, converter unit, D/A conversion unit, field programmable gate array unit, string and converting unit and described electrooptic switching element successively; The other end of described electrooptic switching element is connected with indoor baseband processing unit; The connecting interface agreement of described electrooptic switching element and indoor baseband processing unit can be OBSAI RP3-01 agreement or CPRI agreement, and WIMAX radio frequency far end system of the present invention is supported the networking of daisy chain cascade mode.
Receive from antenna and to output to described LNA after the WIMAX signal suppresses the signal outside the work zone through described cavity body filter and power amplifier unit carries out the low noise processing and amplifying, signal after low noise amplifies outputs to described converter unit and is down-converted to intermediate-freuqncy signal, described D/A conversion unit is that digital medium-frequency signal outputs to described field programmable gate array unit with described intermediate-freuqncy signal analog-to-digital conversion, described field programmable gate array unit carries out Digital Down Convert to described digital medium-frequency signal and is treated to digital baseband signal, again described digital baseband signal is carried out outputing to after framing is handled described string and converting unit and carry out and go here and there conversion, described electrooptic switching element is that light signal outputs to described indoor baseband processing unit with conversion of signals described and that go here and there after changing;
The signal that transmits from described indoor baseband processing unit passes through described electrooptic switching element, sending into described field programmable gate array unit after the string and the conversion of converting unit separates frame and is treated to digital baseband signal, described field programmable gate array unit up-converts to described digital baseband signal digital medium-frequency signal again and outputs to described D/A conversion unit to carry out digital-to-analogue conversion be intermediate-freuqncy signal, described converter unit up-converts to described intermediate-freuqncy signal and outputs to described cavity body filter after radiofrequency signal is handled through the power amplifier of described LNA and power amplifier unit, after described cavity body filter suppresses the signal outside the work zone radiofrequency signal is launched through antenna again.
The WIMAX radio frequency far end system of support MIMO of the present invention, comprise at least two passages, the corresponding antenna that passes through that these passages can walk abreast is launched or received RF signal, can support the MIMO technology, change under the little situation and can make the WIMAX radio frequency far end system be operated in different frequency ranges in WIMAX signal frequency range by changing cavity body filter, under WIMAX signal frequency range variation situation greatly, pass through to change cavity body filter, LNA and power amplifier unit, converter unit can make the WIMAX radio frequency far end system be operated in different frequency ranges, do not need to change whole WIMAX radio frequency far end system, saved production cost; And by the channel width that the field programmable gate array unit can change WIMAX radio frequency far end system of the present invention is set, the user can be provided with the field programmable gate array unit as required flexibly, can use WIMAX radio frequency far end system of the present invention in zones of different, different period, concerning the user, save production cost.
Description of drawings
Fig. 1 is the WIMAX radio frequency far end system structural principle schematic diagram in one embodiment that the present invention supports MIMO;
Fig. 2 is the WIMAX radio frequency far end system structural principle schematic diagram in another embodiment that the present invention supports MIMO;
Fig. 3 is the WIMAX radio frequency far end system structural principle schematic diagram in another embodiment that the present invention supports MIMO;
Fig. 4 is that the present invention supports converter unit internal structure schematic diagram in one embodiment in the WIMAX radio frequency far end system of MIMO;
Fig. 5 is that the present invention supports converter unit internal structure schematic diagram in another embodiment in the WIMAX radio frequency far end system of MIMO.
Embodiment
The WIMAX radio frequency far end system of support MIMO of the present invention, comprise at least two passages, what these passages can walk abreast passes through corresponding antenna emission or receives data-signal, can support the MIMO technology, change under the little situation and can make the WIMAX radio frequency far end system be operated in different frequency ranges in WIMAX signal frequency range by changing cavity body filter, under WIMAX signal frequency range variation situation greatly, pass through to change cavity body filter, LNA and power amplifier unit, converter unit can make the WIMAX radio frequency far end system be operated in different frequency ranges, do not need to change whole WIMAX radio frequency far end system, saved production cost; And by the channel width that the field programmable gate array unit can change WIMAX radio frequency far end system of the present invention is set, the user can be provided with the field programmable gate array unit as required flexibly, can use WIMAX radio frequency far end system of the present invention in zones of different, different period, concerning the user, save production cost.
Below in conjunction with the drawings and specific embodiments the present invention is done a detailed elaboration.
The present invention supports the WIMAX radio frequency far end system of MIMO can be operated in TDD (Time Division Duplexing, time division duplex) standard, it comprises at least two passages, each passage such as Fig. 1 (Fig. 1 only shows the structure principle chart of one of them passage) comprise cavity body filter, LNA and power amplifier unit, converter unit, D/A conversion unit, field programmable gate array unit, string and converting unit and electrooptic switching element;
One end of described cavity body filter is connected with antenna, and the other end is connected by the end of LNA with power amplifier unit, converter unit, D/A conversion unit, field programmable gate array unit, string and converting unit and described electrooptic switching element successively; The other end of described electrooptic switching element is connected with indoor baseband processing unit BBU;
The signal processing of the up link of this WIMAX radio frequency far end system (receiver link) is: receive from antenna and output to described LNA after the WIMAX signal suppresses the signal outside the work zone through described cavity body filter and power amplifier unit carries out the low noise processing and amplifying, signal after low noise amplifies outputs to described converter unit and is down-converted to intermediate-freuqncy signal, described D/A conversion unit is that digital medium-frequency signal outputs to described field programmable gate array unit with described intermediate-freuqncy signal analog-to-digital conversion, described field programmable gate array unit carries out Digital Down Convert to described digital medium-frequency signal and is treated to digital baseband signal, again described digital baseband signal is carried out outputing to after framing is handled described string and converting unit and carry out and go here and there conversion, described electrooptic switching element is that light signal outputs to described indoor baseband processing unit with conversion of signals described and that go here and there after changing;
The signal processing of the down link of this WIMAX radio frequency far end system (transmitter chain) is: the signal that transmits from described indoor processing unit passes through described electrooptic switching element, sending into described field programmable gate array unit after the string and the conversion of converting unit separates frame and is treated to digital baseband signal, described field programmable gate array unit up-converts to described digital baseband signal digital medium-frequency signal again and outputs to described D/A conversion unit to carry out digital-to-analogue conversion be intermediate-freuqncy signal, described converter unit up-converts to described intermediate-freuqncy signal and outputs to described cavity body filter after radiofrequency signal is handled through the power amplifier of described LNA and power amplifier unit, after described cavity body filter suppresses the signal outside the work zone radiofrequency signal is launched through antenna again.
WIMAX radio frequency far end system of the present invention is owing to comprise at least two passages, what these passages can walk abreast passes through corresponding antenna emission or receives data-signal, can support the MIMO technology, and WIMAX radio frequency far end system of the present invention changes under the little situation and can make the WIMAX radio frequency far end system be operated in different frequency ranges by changing cavity body filter in WIMAX signal frequency range, under WIMAX signal frequency range variation situation greatly, pass through to change cavity body filter, LNA and power amplifier unit, converter unit can make the WIMAX radio frequency far end system be operated in different frequency ranges, do not need to change whole WIMAX radio frequency far end system, saved production cost.
The field programmable gate array unit, promptly FPGA (Field-Programmable Gate Array, field programmable gate array) need programme to the RAM in the FPGA during work, and the user can adopt different programming modes according to different configuration modes.When powering up, fpga chip reads in data among the EPROM among the RAM that programmes in the sheet, and after configuration was finished, FPGA entered operating state.After the power down, FPGA reverts to white, and the internal logic relation disappears, and therefore, FPGA can use repeatedly.The programming of FPGA need not be special-purpose the FPGA programmable device, need only get final product with general EPROM, PROM programmable device.When needs are revised the FPGA function, only need change a slice EPROM and get final product.Like this, with a slice FPGA, different programming datas can produce different circuit functions, so the use of FPGA is very flexible.So by the channel width that the field programmable gate array unit can change WIMAX radio frequency far end system of the present invention is set, the user can be provided with the field programmable gate array unit as required flexibly, can use WIMAX radio frequency far end system of the present invention in zones of different, different period, concerning the user, save production cost.
In one embodiment, WIMAX radio frequency far end system of the present invention also comprises first filter, as Fig. 2, be connected between described D/A conversion unit and the described converter unit, be used for the intermediate-freuqncy signal of described converter unit output is carried out anti-aliasing bandpass filtering, or the outer spurious signal of channel width of the intermediate-freuqncy signal of described D/A conversion unit output is carried out filtering.So that described D/A conversion unit and the purer intermediate-freuqncy signal of converter unit output.In concrete enforcement, described first filter can comprise the LC band pass filter.
In one embodiment, as Fig. 3, WIMAX radio frequency far end system of the present invention also comprises the Clock Extraction unit, the one end is connected with described indoor baseband processing unit, the other end is connected with described string and converting unit, field programmable gate array unit, converter unit, D/A conversion unit respectively, be used for extracting clock signal, and described clock signal is outputed to described string and converting unit, field programmable gate array unit, converter unit, D/A conversion unit from the frame rate of described indoor baseband processing unit.The clock signal that can guarantee WIMAX radio frequency far end system of the present invention and indoor baseband processing unit like this is synchronous.In the specific implementation, described Clock Extraction unit can comprise phase-locked loop circuit and clock Dispatching Unit, the input of described phase-locked loop circuit is connected with described indoor baseband processing unit, output by described clock Dispatching Unit respectively with described string and converting unit, the field programmable gate array unit, converter unit, D/A conversion unit connects, phase-locked loop circuit is used for extracting locked clock signal and outputing to described clock Dispatching Unit from described indoor baseband processing unit frame rate, and described clock Dispatching Unit outputs to described string and converting unit respectively with described clock signal, the field programmable gate array unit, converter unit, D/A conversion unit.In addition,, between clock Dispatching Unit and described converter unit, can also be connected with clock purification circuit, to improve the phase noise of converter unit local oscillator in order to satisfy the requirement of WIMAX radio frequency far end system of the present invention to the phase noise of local oscillator in the converter unit.
In one embodiment, described converter unit comprises up-converter circuit and lower frequency changer circuit, and as Fig. 4, described lower frequency changer circuit is used for the signal of described LNA and power amplifier unit output is down-converted to intermediate-freuqncy signal; Described up-converter circuit is used for the intermediate-freuqncy signal of described D/A conversion unit output is upconverted to radiofrequency signal.
In one embodiment, described converter unit also comprises second filter, and as Fig. 5, local oscillation signal and mirror image that described second filter is used for the described converter unit of filtering disturb.The influence of disturbing with the local oscillation signal that reduces described converter unit and mirror image.In concrete enforcement, described second filter can comprise ceramic filter, and described string and converting unit can comprise the SERDES circuit.
Need to prove, though the present invention supports that the WIMAX radio frequency far end system of MIMO is a multi-path-apparatus, the uplink downlink technical scheme of each passage is identical, but the user also can use one of them passage to launch or received RF signal, equally also can realize the function of single channel radio frequency far end system.
The WIMAX radio frequency far end system of support MIMO of the present invention, owing to comprise at least two passages, what these passages can walk abreast passes through corresponding antenna emission or receives data-signal, can support the MIMO technology, and change under the little situation and can make the WIMAX radio frequency far end system be operated in different frequency ranges by changing cavity body filter in WIMAX signal frequency range, under WIMAX signal frequency range variation situation greatly, pass through to change cavity body filter, LNA and power amplifier unit, converter unit can make the WIMAX radio frequency far end system be operated in different frequency ranges, do not need to change whole WIMAX radio frequency far end system, saved production cost; And by the channel width that the field programmable gate array unit can change WIMAX radio frequency far end system of the present invention is set, the user can be provided with the field programmable gate array unit as required flexibly, can use WIMAX radio frequency far end system of the present invention in zones of different, different period, concerning the user, save production cost.
Above-described embodiment of the present invention does not constitute the qualification to protection range of the present invention.Any modification of being done within the spirit and principles in the present invention, be equal to and replace and improvement etc., all should be included within the claim protection range of the present invention.
Claims (10)
1. WIMAX radio frequency far end system of supporting MIMO, it is characterized in that, comprise at least two passages, each passage comprises: cavity body filter, LNA and power amplifier unit, converter unit, D/A conversion unit, field programmable gate array unit, string and converting unit and electrooptic switching element;
One end of described cavity body filter is connected with antenna, and the other end is connected by the end of LNA with power amplifier unit, converter unit, D/A conversion unit, field programmable gate array unit, string and converting unit and described electrooptic switching element successively; The other end of described electrooptic switching element is connected with indoor baseband processing unit;
Receive from antenna and to output to described LNA after the WIMAX signal suppresses the signal outside the work zone through described cavity body filter and power amplifier unit carries out the low noise processing and amplifying, signal after low noise amplifies outputs to described converter unit and is down-converted to intermediate-freuqncy signal, described D/A conversion unit is that digital medium-frequency signal outputs to described field programmable gate array unit with described intermediate-freuqncy signal analog-to-digital conversion, described field programmable gate array unit carries out Digital Down Convert to described digital medium-frequency signal and is treated to digital baseband signal, again described digital baseband signal is carried out outputing to after framing is handled described string and converting unit and carry out and go here and there conversion, described electrooptic switching element is that light signal outputs to described indoor baseband processing unit with conversion of signals described and that go here and there after changing;
The signal that transmits from described indoor processing unit passes through described electrooptic switching element, sending into described field programmable gate array unit after the string and the conversion of converting unit separates frame and is treated to digital baseband signal, described field programmable gate array unit up-converts to described digital baseband signal digital medium-frequency signal again and outputs to described D/A conversion unit to carry out digital-to-analogue conversion be intermediate-freuqncy signal, described converter unit up-converts to described intermediate-freuqncy signal and outputs to described cavity body filter after radiofrequency signal is handled through the power amplifier of described LNA and power amplifier unit, after described cavity body filter suppresses the signal outside the work zone radiofrequency signal is launched through antenna again.
2. the WIMAX radio frequency far end system of support MIMO according to claim 1, it is characterized in that: each passage also comprises first filter, be connected between described D/A conversion unit and the described converter unit, be used for the intermediate-freuqncy signal of described converter unit output is carried out anti-aliasing bandpass filtering, or the outer spurious signal of channel width of the intermediate-freuqncy signal of described D/A conversion unit output is carried out filtering.
3. the WIMAX radio frequency far end system of support MIMO according to claim 2, it is characterized in that: each passage also comprises the Clock Extraction unit, the one end is connected with described indoor baseband processing unit, and the other end is connected with described converter unit, D/A conversion unit, string and converting unit, field programmable gate array unit respectively;
Described Clock Extraction unit is used for extracting clock signal from the frame rate of described indoor baseband processing unit, and described clock signal is outputed to described converter unit, D/A conversion unit, string and converting unit, field programmable gate array unit.
4. the WIMAX radio frequency far end system of support MIMO according to claim 3, it is characterized in that: described Clock Extraction unit comprises phase-locked loop circuit and clock Dispatching Unit, the input of described phase-locked loop circuit is connected with described indoor baseband processing unit, and output is connected with described converter unit, D/A conversion unit, string and converting unit, field programmable gate array unit respectively;
Described phase-locked loop circuit is used for extracting locked clock signal from the frame rate of described indoor baseband processing unit, and described clock signal is outputed to described converter unit, D/A conversion unit, string and converting unit, field programmable gate array unit by the clock Dispatching Unit.
5. the WIMAX radio frequency far end system of support MIMO according to claim 4 is characterized in that: also be connected with the clock purification circuit that is used to improve described converter unit phase noise between described clock Dispatching Unit and described converter unit.
6. according to the WIMAX radio frequency far end system of the described support of the arbitrary claim of claim 1 to 5 MIMO, it is characterized in that: described converter unit comprises up-converter circuit and lower frequency changer circuit;
Described lower frequency changer circuit is used for the signal of described LNA and power amplifier unit output is down-converted to intermediate-freuqncy signal;
Described up-converter circuit is used for the intermediate-freuqncy signal of described D/A conversion unit output is upconverted to radiofrequency signal.
7. the WIMAX radio frequency far end system of support MIMO according to claim 6, it is characterized in that: described converter unit also comprises second filter, local oscillation signal and mirror image that described second filter is used for the described converter unit of filtering disturb.
8. the WIMAX radio frequency far end system of support MIMO according to claim 2, it is characterized in that: described first filter comprises the LC band pass filter.
9. the WIMAX radio frequency far end system of support MIMO according to claim 7, it is characterized in that: described second filter comprises ceramic filter.
10. according to the WIMAX radio frequency far end system of the described support of the arbitrary claim of claim 1 to 5 MIMO, it is characterized in that: described string and converting unit comprise the SERDES circuit.
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| CN2009100392647A CN101882950B (en) | 2009-05-06 | 2009-05-06 | WIMAX radio frequency far end system supporting MIMO |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103916172A (en) * | 2012-12-29 | 2014-07-09 | 重庆重邮信科通信技术有限公司 | Radio-frequency transceiver and radio-frequency transceiving method |
| CN104065408A (en) * | 2014-06-18 | 2014-09-24 | 重庆三峡学院 | Satellite signal repeater |
| CN107942291A (en) * | 2017-10-12 | 2018-04-20 | 西安天和防务技术股份有限公司 | Intermediate frequency digital receiver, IF signal processing method |
| US10098602B2 (en) | 2013-11-21 | 2018-10-16 | Samsung Electronics Co., Ltd. | Apparatus and method for processing a medical image of a body lumen |
| CN114553252A (en) * | 2022-01-17 | 2022-05-27 | 中国电子科技集团公司第五十四研究所 | Radio frequency front end assembly |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1719756B (en) * | 2005-07-25 | 2010-04-07 | 京信通信技术(广州)有限公司 | Method for implementing mobile communication digital optical fibre repeater system |
| WO2008026891A1 (en) * | 2006-08-30 | 2008-03-06 | Posdata Co., Ltd. | Apparatus and method for estimating and compensating time offset and/or carrier frequency offset in mimo system based ofdm/ofdma |
| US7889822B2 (en) * | 2006-09-21 | 2011-02-15 | Broadcom Corporation | Frequency domain equalizer with one dominant interference cancellation for dual antenna radio |
| US8036670B2 (en) * | 2006-12-29 | 2011-10-11 | Intel Corporation | Method and apparatus for concurrent WiMAX and GSM operation |
| CN201450506U (en) * | 2009-05-06 | 2010-05-05 | 京信通信系统（中国）有限公司 | WIMAX radio-frequency far-end system for MIMO |
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- 2009-05-06 CN CN2009100392647A patent/CN101882950B/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103916172A (en) * | 2012-12-29 | 2014-07-09 | 重庆重邮信科通信技术有限公司 | Radio-frequency transceiver and radio-frequency transceiving method |
| CN103916172B (en) * | 2012-12-29 | 2018-03-02 | 锐迪科（重庆）微电子科技有限公司 | A kind of RF transceiver and radio frequency transmit-receive method |
| US10098602B2 (en) | 2013-11-21 | 2018-10-16 | Samsung Electronics Co., Ltd. | Apparatus and method for processing a medical image of a body lumen |
| CN104065408A (en) * | 2014-06-18 | 2014-09-24 | 重庆三峡学院 | Satellite signal repeater |
| CN107942291A (en) * | 2017-10-12 | 2018-04-20 | 西安天和防务技术股份有限公司 | Intermediate frequency digital receiver, IF signal processing method |
| CN114553252A (en) * | 2022-01-17 | 2022-05-27 | 中国电子科技集团公司第五十四研究所 | Radio frequency front end assembly |
| CN114553252B (en) * | 2022-01-17 | 2022-10-14 | 中国电子科技集团公司第五十四研究所 | Radio frequency front end assembly |
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| CN101882950B (en) | 2013-05-01 |
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