CN101882950B - WIMAX radio frequency far end system supporting MIMO - Google Patents
WIMAX radio frequency far end system supporting MIMO Download PDFInfo
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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 development at full speed of mobile communication technology, 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 capacity, the availability of frequency spectrum of communication system 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, namely 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 in zones of different, different period, concerning the user, improved production cost.
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, the other end successively by LNA and power amplifier unit, converter unit, D/A conversion unit, field programmable gate array unit, string and converting unit be connected an end of electrooptic switching element and be 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 WIMAX radio frequency far end system of the present invention is supported the networking of daisy chain cascade mode.
After suppressing the outer signal of work band through described cavity body filter, antenna reception WIMAX signal outputs to described LNA and power amplifier unit carries out the low noise amplification processing, signal behind the low noise amplification 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 described string after framing is processed and converting unit is carried out parallel-serial conversion, the signal of described electrooptic switching element after with described parallel-serial conversion is converted to light signal and outputs to described indoor baseband processing unit;
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 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 processed through the power amplifier of described LNA and power amplifier unit, and described cavity body filter is gone out radiofrequency signal after the outer signal of work band is suppressed again through antenna transmission.
The WIMAX radio frequency far end system of support MIMO of the present invention, comprise at least two passages, these passages can walk abreast passes through corresponding antenna transmission or received RF signal, can support the MIMO technology, change in 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, in 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, the field programmable gate array unit can change the channel width of WIMAX radio frequency far end system of the present invention by being set, the user can arrange 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, these passages can walk abreast passes through corresponding antenna transmission or reception of data signal, can support the MIMO technology, change in 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, in 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, the field programmable gate array unit can change the channel width of WIMAX radio frequency far end system of the present invention by being set, the user can arrange 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 DivisionDuplexing, 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, the other end successively by LNA and power amplifier unit, converter unit, D/A conversion unit, field programmable gate array unit, string and converting unit be connected an end of electrooptic switching element and be 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: output to described LNA and power amplifier unit carries out the low noise amplification processing after antenna reception WIMAX signal suppresses the outer signal of work band through described cavity body filter, signal behind the low noise amplification 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 described string after framing is processed and converting unit is carried out parallel-serial conversion, the signal of described electrooptic switching element after with described parallel-serial conversion is converted to light signal and outputs to described indoor baseband processing unit;
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 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 processed through the power amplifier of described LNA and power amplifier unit, and described cavity body filter is gone out radiofrequency signal after the outer signal of work band is suppressed again through antenna transmission.
WIMAX radio frequency far end system of the present invention is owing to comprise at least two passages, these passages can walk abreast passes through corresponding antenna transmission or reception of data signal, can support the MIMO technology, and WIMAX radio frequency far end system of the present invention changes in 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, in 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, be FPGA (Field-Programmable Gate Array, field programmable gate array), need to the RAM in the FPGA be programmed during work, the user can according to different configuration modes, adopt different programming 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 Reusability.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 can change the channel width of WIMAX radio frequency far end system of the present invention by the field programmable gate array unit is set, the user can arrange 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 the first filter, such 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 implementation, described the first filter can comprise the LC band pass filter.
In one embodiment, such 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 from the frame rate of described indoor baseband processing unit, and described clock signal is outputed to described string and converting unit, field programmable gate array unit, converter unit, D/A conversion unit.The clock signal that can guarantee like this WIMAX radio frequency far end system of the present invention and indoor baseband processing unit 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 respectively described string and converting unit with described clock signal, the field programmable gate array unit, converter unit, D/A conversion unit.In addition, in order to satisfy WIMAX radio frequency far end system of the present invention to the requirement of 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 such 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 the second filter, and such as Fig. 5, local oscillation signal and mirror image that described the second filter is used for the described converter unit of filtering disturb.The impact of disturbing with the local oscillation signal that reduces described converter unit and mirror image.In implementation, described the second filter can comprise ceramic filter, and described string and converting unit can comprise the SERDES circuit.
Need to prove, although the present invention supports that the WIMAX radio frequency far end system of MIMO is 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, these passages can walk abreast passes through corresponding antenna transmission or reception of data signal, can support the MIMO technology, and change in 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, in 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, the field programmable gate array unit can change the channel width of WIMAX radio frequency far end system of the present invention by being set, the user can arrange 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 consist of the restriction to protection range of the present invention.Any modification of doing 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, the other end successively by LNA and power amplifier unit, converter unit, D/A conversion unit, field programmable gate array unit, string and converting unit be connected an end of electrooptic switching element and be connected; The other end of described electrooptic switching element is connected with indoor baseband processing unit;
After suppressing the outer signal of work band through described cavity body filter, antenna reception WIMAX signal outputs to described LNA and power amplifier unit carries out the low noise amplification processing, signal behind the low noise amplification 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 described string after framing is processed and converting unit is carried out parallel-serial conversion, the signal of described electrooptic switching element after with described parallel-serial conversion is converted to light signal and outputs to described indoor baseband processing unit;
The signal that transmits from described indoor processing unit passes through described electrooptic switching element, sending into described field programmable gate array unit after 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 processed through the power amplifier of described LNA and power amplifier unit, and described cavity body filter is gone out radiofrequency signal after the outer signal of work band is suppressed again through antenna transmission.
2. the WIMAX radio frequency far end system of support according to claim 1 MIMO, it is characterized in that: each passage also comprises the 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 according to claim 2 MIMO, 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 according to claim 3 MIMO, 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 between described clock Dispatching Unit and described converter unit be used to the clock purification circuit that improves described converter unit phase noise.
6. according to claim 1 to the WIMAX radio frequency far end system of the described support of 5 arbitrary claims 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 according to claim 6 MIMO, it is characterized in that: described converter unit also comprises the second filter, local oscillation signal and mirror image that described the second filter is used for the described converter unit of filtering disturb.
8. the WIMAX radio frequency far end system of support according to claim 2 MIMO, it is characterized in that: described the first filter comprises the LC band pass filter.
9. the WIMAX radio frequency far end system of support according to claim 7 MIMO, it is characterized in that: described the second filter comprises ceramic filter.
10. according to claim 1 to the WIMAX radio frequency far end system of the described support of 5 arbitrary claims MIMO, it is characterized in that: described string and converting unit comprise the SERDES circuit.
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| 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 |
| KR101578770B1 (en) | 2013-11-21 | 2015-12-18 | 삼성전자주식회사 | Apparatus por processing a medical image and method for processing a medical image |
| CN104065408B (en) * | 2014-06-18 | 2018-10-26 | 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 |
| 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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