CN201450506U - WIMAX radio-frequency far-end system for MIMO - Google Patents
WIMAX radio-frequency far-end system for MIMO Download PDFInfo
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- CN201450506U CN201450506U CN2009200560898U CN200920056089U CN201450506U CN 201450506 U CN201450506 U CN 201450506U CN 2009200560898 U CN2009200560898 U CN 2009200560898U CN 200920056089 U CN200920056089 U CN 200920056089U CN 201450506 U CN201450506 U CN 201450506U
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Abstract
The utility model discloses a WIMAX radio-frequency far-end system for a MIMO, comprising at least two channels, each channel comprises a chamber wave filter, a low noise amplifier and power amplifier unit, a frequency conversion unit, a digital-analog converting unit, an in-situ programmable gate array unit, a series connection to parallel connection/parallel connection to series connection converting unit and an electric-light converting unit, one terminal of the chamber wave filter is connected with an antenna, the other terminal thereof is the electric-light converting unit by the low noise amplifier and power amplifier unit, the frequency conversion unit, the digital-analog converting unit, the in-situ programmable gate array unit, and the series connection to parallel connection/parallel connection to series connection converting unit, and the other terminal of the electric-light converting unit is connected with an indoor base band treatment unit. According to the utility model, the WIMAX radio-frequency far-end system can work at different frequency bands by replacing the chamber wave filter under the condition that the signal frequency bands of WIMAX changes less, thus saving the cost.
Description
Technical field
The utility model relates to moving communicating field, relates 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 utility model provides the WIMAX radio frequency far end system of a kind of MIMO of support, and 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.
The technical solution of the utility model is: a kind of WIMAX radio frequency far end system of supporting MIMO, 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 also/parallel serial conversion unit and electrooptic switching element;
One end of described cavity body filter is connected with antenna, the other end successively by LNA and power amplifier unit, converter unit, D/A conversion unit, field programmable gate array unit, string also/end of parallel serial conversion unit and described electrooptic switching element is connected; 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 the utility model WIMAX radio frequency far end system 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 to described digital baseband signal carry out outputing to after framing is handled described string also/parallel serial conversion unit carries 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, string also/send into described field programmable gate array unit after the conversion of parallel serial conversion unit to separate frame and be 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 utility model, 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.
Description of drawings
Fig. 1 is the WIMAX radio frequency far end system structural principle schematic diagram in one embodiment that the utility model is supported MIMO;
Fig. 2 is the WIMAX radio frequency far end system structural principle schematic diagram in another embodiment that the utility model is supported MIMO;
Fig. 3 is the WIMAX radio frequency far end system structural principle schematic diagram in another embodiment that the utility model is supported MIMO;
Fig. 4 is that the utility model is supported converter unit internal structure schematic diagram in one embodiment in the WIMAX radio frequency far end system of MIMO;
Fig. 5 is that the utility model is supported 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 utility model, 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.
Below in conjunction with the drawings and specific embodiments the utility model is done a detailed elaboration.
The utility model supports the WIMAX radio frequency far end system of MIMO can be operated in TDD (TimeDivision 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, go here and there also/parallel serial conversion unit and electrooptic switching element;
One end of described cavity body filter is connected with antenna, the other end successively by LNA and power amplifier unit, converter unit, D/A conversion unit, field programmable gate array unit, string also/end of parallel serial conversion unit and described electrooptic switching element is connected; 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 to described digital baseband signal carry out outputing to after framing is handled described string also/parallel serial conversion unit carries 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, string also/send into described field programmable gate array unit after the conversion of parallel serial conversion unit to separate frame and be 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 utility model 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 utility model 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 utility model 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 utility model in zones of different, different period, concerning the user, save production cost.
In one embodiment, the utility model WIMAX radio frequency far end system 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, the utility model WIMAX radio frequency far end system also comprises the Clock Extraction unit, the one end is connected with described indoor baseband processing unit, the other end respectively with described string also/parallel serial conversion unit, the field programmable gate array unit, converter unit, D/A conversion unit connects, be used for extracting clock signal from the frame rate of described indoor baseband processing unit, and with described clock signal output to described string also/parallel serial conversion unit, the field programmable gate array unit, converter unit, D/A conversion unit. the clock signal that can guarantee the utility model WIMAX radio frequency far end system 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 also/parallel serial conversion 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, described clock Dispatching Unit with described clock signal output to respectively described string also/parallel serial conversion unit, the field programmable gate array unit, converter unit, D/A conversion unit. in addition, in order to satisfy of the requirement of the utility model WIMAX radio frequency far end system to the phase noise of local oscillator in the converter unit, 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 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, described string also/parallel serial conversion unit can comprise the SERDES circuit.
Need to prove, though the utility model 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.
In addition, field programmable gate array of the present utility model unit in one embodiment, also can adopt digital frequency conversion unit and frame processing unit to realize, one end of described digital frequency conversion unit is connected with described D/A conversion unit, the other end by frame processing unit and described string also/parallel serial conversion unit is connected; The digital medium-frequency signal that described D/A conversion unit is exported in described digital frequency conversion unit down-converts to digital baseband signal and outputs to described frame processing unit, and described frame processing unit carries out described digital baseband signal to output to described string and converting unit after framing is handled; Described frame processing unit with described string also/signal of parallel serial conversion unit output separates frame and is treated to digital baseband signal and outputs to described digital frequency conversion unit, described digital frequency conversion unit up-converts to digital medium-frequency signal with described digital baseband signal and outputs to described D/A conversion unit.
The WIMAX radio frequency far end system of support MIMO of the present utility model, 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.
Above-described the utility model execution mode does not constitute the qualification to the utility model protection range.Any modification of within spirit of the present utility model and principle, being done, be equal to and replace and improvement etc., all should be included within the claim protection range of the present utility model.
Claims (11)
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 also/parallel serial conversion unit and electrooptic switching element;
One end of described cavity body filter is connected with antenna, the other end successively by LNA and power amplifier unit, converter unit, D/A conversion unit, field programmable gate array unit, string also/end of parallel serial conversion unit and described electrooptic switching element is connected; 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 to described digital baseband signal carry out outputing to after framing is handled described string also/parallel serial conversion unit carries 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, string also/send into described field programmable gate array unit after the conversion of parallel serial conversion unit to separate frame and be 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: described field programmable gate array unit comprises digital frequency conversion unit and frame processing unit;
One end of described digital frequency conversion unit is connected with described D/A conversion unit, the other end by frame processing unit and described string also/parallel serial conversion unit is connected; Described digital frequency conversion unit down-converts to digital baseband signal with the digital medium-frequency signal of described D/A conversion unit output and outputs to described frame processing unit, described frame processing unit with described digital baseband signal carry out outputing to after framing is handled described string also/parallel serial conversion unit; Described frame processing unit with described string also/signal of parallel serial conversion unit output separates frame and is treated to digital baseband signal and outputs to described digital frequency conversion unit, described digital frequency conversion unit up-converts to digital medium-frequency signal with described digital baseband signal and outputs to described D/A conversion unit.
3. 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.
4. the WIMAX radio frequency far end system of support MIMO according to claim 3, it is characterized in that: each passage also comprises the Clock Extraction unit, the one end is connected with described indoor baseband processing unit, the other end respectively with described converter unit, D/A conversion unit, string also/parallel serial conversion unit, field programmable gate array unit be connected;
Described Clock Extraction unit is used for extracting clock signal from the frame rate of described indoor baseband processing unit, and with described clock signal output to described converter unit, D/A conversion unit, string also/parallel serial conversion unit, field programmable gate array unit.
5. the WIMAX radio frequency far end system of support MIMO according to claim 4, 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, output respectively with described converter unit, D/A conversion unit, string also/parallel serial conversion unit, field programmable gate array unit be connected;
Described phase-locked loop circuit is used for extracting locked clock signal from the frame rate of described indoor baseband processing unit, and with described clock signal by the clock Dispatching Unit output to described converter unit, D/A conversion unit, string also/parallel serial conversion unit, field programmable gate array unit.
6. the WIMAX radio frequency far end system of support MIMO according to claim 5 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.
7. according to the WIMAX radio frequency far end system of the described support of the arbitrary claim of claim 1 to 6 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.
8. the WIMAX radio frequency far end system of support MIMO according to claim 7, 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.
9. the WIMAX radio frequency far end system of support MIMO according to claim 3, it is characterized in that: described first filter comprises the LC band pass filter.
10. the WIMAX radio frequency far end system of support MIMO according to claim 8, it is characterized in that: described second filter comprises ceramic filter.
11. the WIMAX radio frequency far end system according to the described support of the arbitrary claim of claim 1 to 6 MIMO is characterized in that: described string also/parallel serial conversion unit comprises the SERDES circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009200560898U CN201450506U (en) | 2009-05-06 | 2009-05-06 | WIMAX radio-frequency far-end system for MIMO |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009200560898U CN201450506U (en) | 2009-05-06 | 2009-05-06 | WIMAX radio-frequency far-end system for MIMO |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882950B (en) * | 2009-05-06 | 2013-05-01 | 京信通信系统（中国）有限公司 | WIMAX radio frequency far end system supporting MIMO |
| CN116760438A (en) * | 2023-08-07 | 2023-09-15 | 赛尔通信服务技术股份有限公司 | Parallel-serial conversion and enhancement device for 5G multichannel same-frequency MIMO signals |
-
2009
- 2009-05-06 CN CN2009200560898U patent/CN201450506U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101882950B (en) * | 2009-05-06 | 2013-05-01 | 京信通信系统（中国）有限公司 | WIMAX radio frequency far end system supporting MIMO |
| CN116760438A (en) * | 2023-08-07 | 2023-09-15 | 赛尔通信服务技术股份有限公司 | Parallel-serial conversion and enhancement device for 5G multichannel same-frequency MIMO signals |
| CN116760438B (en) * | 2023-08-07 | 2023-10-20 | 赛尔通信服务技术股份有限公司 | Parallel-serial conversion and enhancement device for 5G multichannel same-frequency MIMO signals |
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