CN104301003B - A kind of digital microwave far-drawing system - Google Patents
A kind of digital microwave far-drawing system Download PDFInfo
- Publication number
- CN104301003B CN104301003B CN201410583554.9A CN201410583554A CN104301003B CN 104301003 B CN104301003 B CN 104301003B CN 201410583554 A CN201410583554 A CN 201410583554A CN 104301003 B CN104301003 B CN 104301003B
- Authority
- CN
- China
- Prior art keywords
- signal
- frequency
- module
- output port
- switch
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 230000005540 biological transmission Effects 0.000 claims abstract description 20
- 238000001914 filtration Methods 0.000 claims description 42
- 230000001629 suppression Effects 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 9
- 239000013078 crystal Substances 0.000 claims description 8
- 230000008030 elimination Effects 0.000 claims description 7
- 238000003379 elimination reaction Methods 0.000 claims description 7
- 238000012544 monitoring process Methods 0.000 claims description 7
- 238000001228 spectrum Methods 0.000 claims description 7
- 230000003321 amplification Effects 0.000 claims description 3
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000004891 communication Methods 0.000 abstract description 10
- 238000010586 diagram Methods 0.000 description 4
- 230000000007 visual effect Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000005433 ionosphere Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Landscapes
- Transceivers (AREA)
- Transmitters (AREA)
- Noise Elimination (AREA)
Abstract
Digital microwave far-drawing system of the present invention is operated in hyper band, and radio wave diffraction ability is stronger, can, with less equipment cost, meet the demand of remote beyond-the-horizon communication, can also guarantee the transmitting of information under over the horizon transmission variable-parameter channel; Digital microwave far-drawing system of the present invention can be realized feedback cancellation without channel is estimated, practical under varying Channels condition.
Description
Technical Field
The invention relates to the field of microwave communication, in particular to a digital microwave remote system.
Background
At present, the influence of short-wave communication ionosphere has a communication dead zone, the communication distance of a radio station generally does not exceed 30km, and satellite communication cannot be used in large quantity due to high cost. Low-cost, lightweight, flexible and versatile communication devices are receiving increasing attention. Therefore, it is a long-standing and urgent communication problem to develop a small, lightweight, low-cost and portable device to solve the medium-short distance wireless information transmission.
Firstly, in the existing microwave remote system, circuits and the like between each unit are independent and are connected with each other by cables, so that the microwave remote system has the advantages of large volume, complex structure and low reliability. With the increasing demand for communication system performance, the demand for high-quality, highly integrated, modular, and miniaturized microwave remote system devices is urgent, and it is necessary to integrate the constituent circuits together to meet the demand for miniaturization and integration, and at the same time, the use is simple.
Secondly, a common problem of the existing remote microwave system is mutual interference between transmission and reception, that is, a transmitted signal is received again by a receiving antenna, which causes serious interference to an actual received signal. However, when the microwave remote system is miniaturized, the mutual interference problem becomes more serious.
Therefore, it is necessary to redesign a microwave zoom-out system to address the above problems.
Disclosure of Invention
The purpose of the invention is realized by the following technical scheme.
According to an embodiment of the present invention, a digital microwave remote system is provided, the system including:
the ultrahigh frequency microwave receiving and transmitting unit is used for receiving and transmitting microwave signals and works in an ultrahigh frequency band; and
and the mutual interference elimination unit is used for mutual interference elimination of the receiving and transmitting signals of the microwave remote system.
According to an embodiment of the present invention, the uhf transceiver unit includes: the device comprises an in-phase quadrature modulator, a transmitting power control unit, a transmitting FH spreading unit, a crystal resonator, a first power divider, a receiving FH spreading unit, an image frequency rejection mixer, an intermediate frequency amplifier, a second power divider, a first switch, a second switch, a first intermediate frequency filter, a second intermediate frequency filter, a third switch, a fourth switch, a demodulator, a power supply and a monitoring unit;
a first input port of the in-phase quadrature modulator is externally connected with a baseband input signal, a third output port of the in-phase quadrature modulator is connected with a first port of the transmitting power control unit, and a second output port of the transmitting power control unit outputs a radio frequency signal; a first output port of the crystal resonator is connected with a second input port of the first power divider; a first output port of the first power divider is connected with a second input port of the receiving FH spreading unit, and a third output port of the first power divider is connected with a first input port of the transmitting FH spreading unit; a second output port of the transmission FH spreading unit is connected with a second input port of the in-phase quadrature modulator; a first input port of the image frequency suppression mixer is externally connected with a radio frequency signal, a second input port of the image frequency suppression mixer is connected with a first output port of the FH spreading unit, and a third output port of the image frequency suppression mixer is connected with a second input port of the intermediate frequency amplifier; the first output port of the intermediate frequency amplifier is connected with the second port of the second power divider; a first output port of the second power divider is connected with a second input port of the demodulator, and a third port of the second power divider is connected with a second port of the first switch; a first output port of the first switch is connected with a second input port of the first intermediate frequency filter, and a third output port of the first switch is connected with a second input port of the second switch; a first output port of the second switch is connected with a second input port of the second intermediate frequency filter, and a third output port of the second switch is connected with a second input port of the third intermediate frequency filter; a first output port of the first intermediate frequency filter is connected with a second input port of the fourth switch; a first output port of the second intermediate frequency filter is connected with a second input port of the third switch; a first output port of the third intermediate frequency filter is connected with a third input port of the third switch; the first output port of the third switch is connected with the third input port of the fourth switch; a first output port of the fourth switch outputs an intermediate frequency signal; the first output port of the demodulator is connected with the monitoring unit; the in-phase quadrature modulator directly modulates the input baseband signal to the radio frequency required by transmission, and sends the radio frequency to the transmission power control unit, and the transmission power control unit controls the amplitude of the radio frequency signal to be output within a required range; the image frequency suppression mixer converts the frequency of the radio frequency signal from the low noise amplifier to output an intermediate frequency signal, then performs intermediate frequency amplification, and the amplified signal is sent to the demodulator through the power divider in one path and is output after intermediate frequency filtering in the other path.
According to an embodiment of the present invention, the mutual interference cancellation unit includes:
the receiving module is used for receiving a feedback signal formed by a base station signal and a transmitting signal after passing through a feedback channel and sending the received base station signal and the received feedback signal to the digital baseband conversion module;
the digital baseband conversion module is respectively connected with the receiving module and the digital signal processing module and is used for converting the base station signal and the feedback signal into a baseband signal after frequency mixing and then outputting the baseband signal to the digital signal processing module;
the digital signal processing module is respectively connected with the digital baseband conversion module, the micro signal generation module and the combination module and is used for filtering the baseband signals through two filters with intermediate frequencies respectively being a first frequency and a second frequency, the signals formed after filtering by the filters with the intermediate frequencies being the first frequency comprise the base station signals, and the second frequency is the frequency at the frequency spectrum cavity of the base station signals; recording a signal formed after filtering by a filter with the intermediate frequency of the first frequency as a first branch signal, and recording a signal formed after filtering by a filter with the intermediate frequency of the second frequency as a second branch signal; carrying out reverse frequency shift on the second branch signal to the first frequency, and amplifying the amplitude of the second branch signal by k times, wherein k is larger than 10 to form a signal to be canceled; subtracting the signal to be canceled from the first branch signal to obtain a feedback canceled signal, and respectively sending the feedback canceled signal to the micro-signal generation module and the combination module;
the micro-signal generating module is respectively connected with the digital signal processing module and the combination module and is used for receiving the feedback cancellation signal output by the digital signal processing module, shifting the frequency of the feedback cancellation signal to the second frequency, reducing the amplitude of the feedback cancellation signal to 1/k times of the original amplitude to obtain a micro-signal and then outputting the micro-signal to the combination module;
and the combination module is respectively connected with the digital signal processing module and the micro-signal generating module and used for adding the feedback-cancelled signal and the micro-signal to obtain a signal to be transmitted and sending the signal to be transmitted to the transmission power control unit.
According to a preferred embodiment of the present invention, the digital signal processing module includes:
the first filtering module is connected with the subtraction module and used for filtering the baseband signal through a filter with the middle frequency as the first frequency, and the signal formed after filtering comprises the base station signal; recording a signal formed after filtering by a filter with the intermediate frequency as a first branch signal, and sending the first branch signal to a subtraction module;
the second filtering module is connected with the inverse frequency shifting module and used for filtering the baseband signal through a filter with the middle frequency as a second frequency, wherein the second frequency is the frequency at the frequency spectrum hole of the base station signal; recording a signal formed after filtering by a filter with the middle frequency as the second frequency as a second branch signal, and sending the second branch signal to an inverse frequency shift module;
the inverse frequency shifting module is respectively connected with the second filtering module and the amplifying module and is used for performing inverse frequency shifting on the second branch signal to the first frequency and sending the inverse frequency-shifted signal to the amplifying module;
the amplifying module is respectively connected with the inverse frequency shifting module and the subtracting module and is used for amplifying the amplitude of the signal subjected to inverse frequency shifting by k times, wherein k is more than 10 so as to form a signal to be canceled, and then sending the signal to be canceled to the subtracting module; and
and the subtraction module is respectively connected with the first filtering module and the amplifying module and is used for subtracting the signal to be canceled from the first branch signal to obtain a feedback canceled signal.
According to a preferred embodiment of the present invention, the micro signal generating module includes a frequency shift module and a down-scaling module; the frequency shift module is used for shifting the feedback-cancelled signal to the second frequency and outputting the signal to the power down module, and the power down module is used for reducing the amplitude of the signal shifted to the second frequency to 1/k times of the amplitude of the feedback-cancelled signal, so as to form a micro signal.
The digital microwave remote system works in an ultrahigh frequency band, has strong electric wave diffraction capability, can meet the requirement of long-distance beyond visual range communication with lower equipment cost, and can ensure reliable transmission of information under an beyond visual range transmission parameter-changing channel; the digital microwave remote system can realize feedback cancellation without estimating the channel, and has strong practicability under the condition of a fast time-varying channel.
Drawings
Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a schematic structural diagram of a digital microwave remote system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a uhf transceiver unit according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a mutual interference cancellation unit according to an embodiment of the present invention;
fig. 4 shows a schematic diagram of a digital signal processing module according to an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.
According to an embodiment of the present invention, a digital microwave remote system is provided, as shown in fig. 1, the system includes:
the ultrahigh frequency microwave receiving and transmitting unit is used for receiving and transmitting microwave signals and works in an ultrahigh frequency band; and
and the mutual interference elimination unit is used for mutual interference elimination of the receiving and transmitting signals of the microwave remote system.
According to an embodiment of the present invention, as shown in fig. 2, the uhf transceiver unit includes: the device comprises an in-phase quadrature modulator, a transmitting power control unit, a transmitting FH spreading unit, a crystal resonator, a first power divider, a receiving FH spreading unit, an image frequency rejection mixer, an intermediate frequency amplifier, a second power divider, a first switch, a second switch, a first intermediate frequency filter, a second intermediate frequency filter, a third switch, a fourth switch, a demodulator, a power supply and a monitoring unit;
a first input port of the in-phase quadrature modulator is externally connected with a baseband input signal, a third output port of the in-phase quadrature modulator is connected with a first port of the transmitting power control unit, and a second output port of the transmitting power control unit outputs a radio frequency signal; a first output port of the crystal resonator is connected with a second input port of the first power divider; a first output port of the first power divider is connected with a second input port of the receiving FH spreading unit, and a third output port of the first power divider is connected with a first input port of the transmitting FH spreading unit; a second output port of the transmission FH spreading unit is connected with a second input port of the in-phase quadrature modulator; a first input port of the image frequency suppression mixer is externally connected with a radio frequency signal, a second input port of the image frequency suppression mixer is connected with a first output port of the FH spreading unit, and a third output port of the image frequency suppression mixer is connected with a second input port of the intermediate frequency amplifier; the first output port of the intermediate frequency amplifier is connected with the second port of the second power divider; a first output port of the second power divider is connected with a second input port of the demodulator, and a third port of the second power divider is connected with a second port of the first switch; a first output port of the first switch is connected with a second input port of the first intermediate frequency filter, and a third output port of the first switch is connected with a second input port of the second switch; a first output port of the second switch is connected with a second input port of the second intermediate frequency filter, and a third output port of the second switch is connected with a second input port of the third intermediate frequency filter; a first output port of the first intermediate frequency filter is connected with a second input port of the fourth switch; a first output port of the second intermediate frequency filter is connected with a second input port of the third switch; a first output port of the third intermediate frequency filter is connected with a third input port of the third switch; the first output port of the third switch is connected with the third input port of the fourth switch; a first output port of the fourth switch outputs an intermediate frequency signal; the first output port of the demodulator is connected with the monitoring unit; the in-phase quadrature modulator directly modulates the input baseband signal to the radio frequency required by transmission, and sends the radio frequency to the transmission power control unit, and the transmission power control unit controls the amplitude of the radio frequency signal to be output within a required range; the image frequency suppression mixer converts the frequency of the radio frequency signal from the low noise amplifier to output an intermediate frequency signal, then performs intermediate frequency amplification, and the amplified signal is sent to the demodulator through the power divider in one path and is output after intermediate frequency filtering in the other path.
The receiving FH spreading unit and the transmitting FH spreading unit share a clock generated by a crystal resonator.
The image reject mixer may be either passive or active.
The in-phase quadrature modulator, the transmitting power control unit, the transmitting FH spreading unit, the crystal resonator, the first power divider, the receiving FH spreading unit, the image frequency rejection mixer, the intermediate frequency amplifier, the second power divider, the first switch, the second switch, the first intermediate frequency filter, the second intermediate frequency filter, the third switch, the fourth switch, the demodulator, the power supply and the monitoring unit are integrated on a printed board.
According to an embodiment of the present invention, as shown in fig. 3, the mutual interference cancellation unit includes:
the receiving module is used for receiving a feedback signal formed by a base station signal and a transmitting signal after passing through a feedback channel and sending the received base station signal and the received feedback signal to the digital baseband conversion module;
the digital baseband conversion module is respectively connected with the receiving module and the digital signal processing module and is used for converting the base station signal and the feedback signal into a baseband signal after frequency mixing and then outputting the baseband signal to the digital signal processing module;
the digital signal processing module is respectively connected with the digital baseband conversion module, the micro signal generation module and the combination module and is used for filtering the baseband signals through two filters with intermediate frequencies respectively being a first frequency and a second frequency, the signals formed after filtering by the filters with the intermediate frequencies being the first frequency comprise the base station signals, and the second frequency is the frequency at the frequency spectrum cavity of the base station signals; recording a signal formed after filtering by a filter with the intermediate frequency of the first frequency as a first branch signal, and recording a signal formed after filtering by a filter with the intermediate frequency of the second frequency as a second branch signal; carrying out reverse frequency shift on the second branch signal to the first frequency, and amplifying the amplitude of the second branch signal by k times, wherein k is larger than 10 to form a signal to be canceled; subtracting the signal to be canceled from the first branch signal to obtain a feedback canceled signal, and respectively sending the feedback canceled signal to the micro-signal generation module and the combination module;
the micro-signal generating module is respectively connected with the digital signal processing module and the combination module and is used for receiving the feedback cancellation signal output by the digital signal processing module, shifting the frequency of the feedback cancellation signal to the second frequency, reducing the amplitude of the feedback cancellation signal to 1/k times of the original amplitude to obtain a micro-signal and then outputting the micro-signal to the combination module;
and the combination module is respectively connected with the digital signal processing module and the micro-signal generating module and used for adding the feedback-cancelled signal and the micro-signal to obtain a signal to be transmitted and sending the signal to be transmitted to the transmission power control unit.
According to a preferred embodiment of the present invention, as shown in fig. 4, the digital signal processing module includes:
the first filtering module is connected with the subtraction module and used for filtering the baseband signal through a filter with the middle frequency as the first frequency, and the signal formed after filtering comprises the base station signal; recording a signal formed after filtering by a filter with the intermediate frequency as a first branch signal, and sending the first branch signal to a subtraction module;
the second filtering module is connected with the inverse frequency shifting module and used for filtering the baseband signal through a filter with the middle frequency as a second frequency, wherein the second frequency is the frequency at the frequency spectrum hole of the base station signal; recording a signal formed after filtering by a filter with the middle frequency as the second frequency as a second branch signal, and sending the second branch signal to an inverse frequency shift module;
the inverse frequency shifting module is respectively connected with the second filtering module and the amplifying module and is used for performing inverse frequency shifting on the second branch signal to the first frequency and sending the inverse frequency-shifted signal to the amplifying module;
the amplifying module is respectively connected with the inverse frequency shifting module and the subtracting module and is used for amplifying the amplitude of the signal subjected to inverse frequency shifting by k times, wherein k is more than 10 so as to form a signal to be canceled, and then sending the signal to be canceled to the subtracting module; and
and the subtraction module is respectively connected with the first filtering module and the amplifying module and is used for subtracting the signal to be canceled from the first branch signal to obtain a feedback canceled signal.
According to a preferred embodiment of the present invention, the micro signal generating module includes a frequency shift module and a down-scaling module; the frequency shift module is used for shifting the feedback-cancelled signal to the second frequency and outputting the signal to the power down module, and the power down module is used for reducing the amplitude of the signal shifted to the second frequency to 1/k times of the amplitude of the feedback-cancelled signal, so as to form a micro signal.
The mutual interference elimination unit generates a micro signal by using a frequency shift method, adds the micro signal to a frequency spectrum hole of a base station transmitting signal, realizes feedback cancellation by using the characteristic that the micro signal and the transmitting signal only have different frequency point positions and amplitudes, can realize feedback cancellation without estimating a channel, and has strong practicability under the condition of a fast time-varying channel.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (3)
1. A digital microwave remote system, the system comprising:
the ultrahigh frequency microwave receiving and transmitting unit is used for receiving and transmitting microwave signals and works in an ultrahigh frequency band; and
the mutual interference elimination unit is used for mutual interference elimination of the receiving and transmitting signals of the microwave remote system; wherein,
the ultra-high frequency microwave transceiving unit comprises: the device comprises an in-phase quadrature modulator, a transmitting power control unit, a transmitting FH spreading unit, a crystal resonator, a first power divider, a receiving FH spreading unit, an image frequency rejection mixer, an intermediate frequency amplifier, a second power divider, a first switch, a second switch, a first intermediate frequency filter, a second intermediate frequency filter, a third switch, a fourth switch, a demodulator, a power supply and a monitoring unit;
a first input port of the in-phase quadrature modulator is externally connected with a baseband input signal, a third output port of the in-phase quadrature modulator is connected with a first port of the transmitting power control unit, and a second output port of the transmitting power control unit outputs a radio frequency signal; a first output port of the crystal resonator is connected with a second input port of the first power divider; a first output port of the first power divider is connected with a second input port of the receiving FH spreading unit, and a third output port of the first power divider is connected with a first input port of the transmitting FH spreading unit; a second output port of the transmission FH spreading unit is connected with a second input port of the in-phase quadrature modulator; a first input port of the image frequency suppression mixer is externally connected with a radio frequency signal, a second input port of the image frequency suppression mixer is connected with a first output port of the FH spreading unit, and a third output port of the image frequency suppression mixer is connected with a second input port of the intermediate frequency amplifier; the first output port of the intermediate frequency amplifier is connected with the second port of the second power divider; a first output port of the second power divider is connected with a second input port of the demodulator, and a third port of the second power divider is connected with a second port of the first switch; a first output port of the first switch is connected with a second input port of the first intermediate frequency filter, and a third output port of the first switch is connected with a second input port of the second switch; a first output port of the second switch is connected with a second input port of the second intermediate frequency filter, and a third output port of the second switch is connected with a second input port of the third intermediate frequency filter; a first output port of the first intermediate frequency filter is connected with a second input port of the fourth switch; a first output port of the second intermediate frequency filter is connected with a second input port of the third switch; a first output port of the third intermediate frequency filter is connected with a third input port of the third switch; the first output port of the third switch is connected with the third input port of the fourth switch; a first output port of the fourth switch outputs an intermediate frequency signal; the first output port of the demodulator is connected with the monitoring unit; the in-phase quadrature modulator directly modulates the input baseband signal to the radio frequency required by transmission, and sends the radio frequency to the transmission power control unit, and the transmission power control unit controls the amplitude of the radio frequency signal to be output within a required range; the image frequency suppression mixer converts the frequency of a radio frequency signal from a low noise amplifier to output an intermediate frequency signal, then performs intermediate frequency amplification, and the amplified signal is sent to a demodulator through a power divider in one path and is output after intermediate frequency filtering in the other path; and
the mutual interference cancellation unit includes:
the receiving module is used for receiving a feedback signal formed by a base station signal and a transmitting signal after passing through a feedback channel and sending the received base station signal and the received feedback signal to the digital baseband conversion module;
the digital baseband conversion module is respectively connected with the receiving module and the digital signal processing module and is used for converting the base station signal and the feedback signal into a baseband signal after frequency mixing and then outputting the baseband signal to the digital signal processing module; the digital signal processing module is respectively connected with the digital baseband conversion module, the micro signal generation module and the combination module and is used for filtering the baseband signals through two filters with intermediate frequencies respectively being a first frequency and a second frequency, the signals formed after filtering by the filters with the intermediate frequencies being the first frequency comprise the base station signals, and the second frequency is the frequency at the frequency spectrum cavity of the base station signals; recording a signal formed after filtering by a filter with the intermediate frequency of the first frequency as a first branch signal, and recording a signal formed after filtering by a filter with the intermediate frequency of the second frequency as a second branch signal; carrying out reverse frequency shift on the second branch signal to the first frequency, and amplifying the amplitude of the second branch signal by k times, wherein k is larger than 10 to form a signal to be canceled; subtracting the signal to be canceled from the first branch signal to obtain a feedback canceled signal, and respectively sending the feedback canceled signal to the micro-signal generation module and the combination module;
the micro-signal generating module is respectively connected with the digital signal processing module and the combination module and is used for receiving the feedback cancellation signal output by the digital signal processing module, shifting the frequency of the feedback cancellation signal to the second frequency, reducing the amplitude of the feedback cancellation signal to 1/k times of the original amplitude to obtain a micro-signal and then outputting the micro-signal to the combination module;
and the combination module is respectively connected with the digital signal processing module and the micro-signal generating module and used for adding the feedback-cancelled signal and the micro-signal to obtain a signal to be transmitted and sending the signal to be transmitted to the transmission power control unit.
2. A system according to claim 1, the digital signal processing module comprising:
the first filtering module is connected with the subtraction module and used for filtering the baseband signal through a filter with the middle frequency as the first frequency, and the signal formed after filtering comprises the base station signal; recording a signal formed after filtering by a filter with the intermediate frequency as a first branch signal, and sending the first branch signal to a subtraction module;
the second filtering module is connected with the inverse frequency shifting module and used for filtering the baseband signal through a filter with the middle frequency as a second frequency, wherein the second frequency is the frequency at the frequency spectrum hole of the base station signal; recording a signal formed after filtering by a filter with the middle frequency as the second frequency as a second branch signal, and sending the second branch signal to an inverse frequency shift module;
the inverse frequency shifting module is respectively connected with the second filtering module and the amplifying module and is used for performing inverse frequency shifting on the second branch signal to the first frequency and sending the inverse frequency-shifted signal to the amplifying module;
the amplifying module is respectively connected with the inverse frequency shifting module and the subtracting module and is used for amplifying the amplitude of the signal subjected to inverse frequency shifting by k times, wherein k is more than 10 so as to form a signal to be canceled, and then sending the signal to be canceled to the subtracting module; and
and the subtraction module is respectively connected with the first filtering module and the amplifying module and is used for subtracting the signal to be canceled from the first branch signal to obtain a feedback canceled signal.
3. The system of claim 1, wherein the micro signal generating module comprises a frequency shift module and a down-scaling module; the frequency shift module is used for shifting the feedback-cancelled signal to the second frequency and outputting the signal to the power down module, and the power down module is used for reducing the amplitude of the signal shifted to the second frequency to 1/k times of the amplitude of the feedback-cancelled signal, so as to form a micro signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410583554.9A CN104301003B (en) | 2014-10-27 | 2014-10-27 | A kind of digital microwave far-drawing system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410583554.9A CN104301003B (en) | 2014-10-27 | 2014-10-27 | A kind of digital microwave far-drawing system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104301003A CN104301003A (en) | 2015-01-21 |
| CN104301003B true CN104301003B (en) | 2016-05-25 |
Family
ID=52320595
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410583554.9A Active CN104301003B (en) | 2014-10-27 | 2014-10-27 | A kind of digital microwave far-drawing system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104301003B (en) |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5752164A (en) * | 1992-04-27 | 1998-05-12 | American Pcs L.P. | Autonomous remote measurement unit for a personal communications service system |
| CN2831265Y (en) * | 2005-09-29 | 2006-10-25 | 中国电子科技集团公司第五十研究所 | Microwave module of roadside unit in electronic non-parking charging short-range communication system |
| US8619732B2 (en) * | 2008-02-28 | 2013-12-31 | Broadcom Corporation | Method and apparatus for enabling coexistence of plurality of communication technologies on communication device |
| CN201302722Y (en) * | 2008-12-01 | 2009-09-02 | 西安电子科技大学 | Ultrahigh frequency wireless radio frequency identification reader |
| CN201690606U (en) * | 2010-05-25 | 2010-12-29 | 京信通信系统（中国）有限公司 | Multi-split microwave remote system |
| US9112549B2 (en) * | 2012-10-05 | 2015-08-18 | Dali Systems Co. Ltd. | DAS integrated digital off-air repeater |
| CN102970260B (en) * | 2012-12-24 | 2016-05-04 | 京信通信系统（中国）有限公司 | Noise suppressing method, device and LTE digital microwave radio remote unit coverage system |
| CN202979007U (en) * | 2012-12-24 | 2013-06-05 | 京信通信系统（中国）有限公司 | LTE digital microwave remote radio head coverage system and uplink baseband processor |
-
2014
- 2014-10-27 CN CN201410583554.9A patent/CN104301003B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104301003A (en) | 2015-01-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| FI111490B (en) | Radio receiver | |
| CN102916719B (en) | Multichannel, multi-mode, multi-functional L-band wireless set | |
| US8938204B2 (en) | Signal generator circuit and radio transmission and reception device including the same | |
| CN103546189B (en) | Radio frequency front-end circuit and system | |
| WO2014145366A3 (en) | Extremely high frequency communication chip | |
| US8908803B2 (en) | Near field communications transmitter | |
| CN103248594A (en) | Method for realizing co-frequency full duplex wireless communication | |
| US9231639B2 (en) | High frequency transceiver | |
| CN201887760U (en) | UHF range miniaturized broadband multifunctional frequency-hopping transceiver | |
| JP5696622B2 (en) | Wireless transmission device | |
| JP2006186956A5 (en) | ||
| US9853686B2 (en) | Vector modulator and transceiver including the same | |
| US11196506B2 (en) | Interference signal generation device, interference signal generation system, and interference signal generation method | |
| JP5890852B2 (en) | Mobile terminal test apparatus and test method | |
| CN104301003B (en) | A kind of digital microwave far-drawing system | |
| CN104242966B (en) | Noise elimination method and noise elimination device | |
| CN102089987B (en) | Communication device, distortion compensation circuit, and distortion compensation method | |
| KR100957837B1 (en) | Antenna-separated wireless system using time division multiple access | |
| CN105656493B (en) | Signal receiving and transmitting system and communication equipment | |
| CN104883201B (en) | Full duplex meteoric trail communication device based on single antenna | |
| US20150326419A1 (en) | Radio system for simultaneous multi-channel reception | |
| KR20160093373A (en) | Digital RF Repeater | |
| KR101140587B1 (en) | Local oscillator signal generator for better receiver sensitivity in rfid system | |
| JP2008205564A (en) | Radio relay method, radio equipment and radio relay system | |
| RU2504903C2 (en) | Regional information communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |