CN201781489U - Wireless repeater with function of eliminating feedback interference signals - Google Patents
Wireless repeater with function of eliminating feedback interference signals Download PDFInfo
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- CN201781489U CN201781489U CN 201020534821 CN201020534821U CN201781489U CN 201781489 U CN201781489 U CN 201781489U CN 201020534821 CN201020534821 CN 201020534821 CN 201020534821 U CN201020534821 U CN 201020534821U CN 201781489 U CN201781489 U CN 201781489U
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Abstract
The utility model relates to a wireless repeater with the function of eliminating feedback interference signals, which is characterized in that a donor antenna is connected to a duplexer firstly, then sequentially connected with a low noise amplifier, a mixing filter, an ADC down-converter, a feedback interference eliminator, a DAC up-converter, a mixing filter, a power amplifier and a duplexer, and finally connected to a re-transmit antenna; the re-transmit antenna is connected to the duplexer, then sequentially connected with the low noise amplifier, the mixing filter, the ADC down-converter, the feedback interference eliminator, the DAC up-converter, the mixing filter, the power amplifier and the duplexer, and finally connected to the donor antenna. The utility model is applied to the elimination of the feedback interference signals of the repeater, and the wireless repeater can eliminate the feedback interference signals, thereby greatly increasing the equivalent isolation of the two antennas, and facilitating the installation and construction of the repeater.
Description
Technical field
The utility model relates to a kind of wireless discharging-directly station, particularly has the wireless discharging-directly station device that feedback interference is eliminated function.
Background technology
Repeater (repeater) belongs to the frequency multiplying arrangement, is meant to play a kind of radio transmission transferring equipment that signal strengthens in the wireless communication transmissions process.The basic function of repeater is exactly a radiofrequency signal power intensifier.The repeater by donor antenna pickoff signals from existing overlay area, is transmitted into the signal of filtering once more after power amplifier amplifies and treats the overlay area in down link.In up link, the signal of the travelling carriage mobile phone in the overlay area is transmitted into corresponding base station with same working method after by up amplification link processing, thereby reaches the signal transmission of base station and mobile phone.
In traditional radio repeater system, because donor antenna and retransmitting antenna inevitably are coupled, the isolation of two antennas is limited, is easy to take place self-excitation in project installation.Generally require the isolation of two antennas to gain more than the big 15dB than the repeater in the practical engineering application, only in this way, the work of equipment is just more stable, but has increased the engineering workload like this, has also caused the inconvenience of engineering construction.
Summary of the invention
The purpose of this utility model is to provide a kind of wireless discharging-directly station that feedback interference is eliminated function that has, and the feedback interference signal can be eliminated in this repeater, has increased the equivalent isolation of two antennas greatly, has made things convenient for the wireless discharging-directly station installation.
Its technical scheme is:
At first donor antenna inserts duplexer, and connection successively again, ADC down-conversion, feedback interference elimination, DAC up-conversion, mixing and filtering, power amplifier and duplexer are connected to retransmitting antenna; Retransmitting antenna inserts duplexer, connects LNA, mixing and filtering, ADC down-conversion, feedback interference elimination, DAC up-conversion, mixing and filtering, power amplifier and duplexer more successively to donor antenna
Described feedback interference is eliminated the method for handling:
(1) in normal traffic signal, adds one group of particular test signal that has no truck with and do not influence the proper communication business;
(2) this communication traffic signal that has superposeed test signal is launched;
(3) after after a while, in the reception corresponding with the signal emission port
Port will attach the feedback interference signal in the received signal;
(4) this subsidiary there be the input signal of feedback interference and be input to digital signal processing module through the test signal that postpones;
(5) utilize the relation of two groups of signals to carry out calculation process, obtain to be used for the parameter that feedback interference is eliminated,
(6) utilize the parameter that obtains that the feedback interference signal is eliminated processing.
, this method can be eliminated the feedback interference signal, has increased the equivalent isolation of two antennas greatly, has made things convenient for the wireless discharging-directly station installation.
Description of drawings:
Fig. 1 has the wireless discharging-directly station up-downgoing circuit theory diagrams that feedback interference is eliminated function.
Fig. 2 is the processing procedure schematic diagram of feedback interference cancellation module to digital baseband signal.
Embodiment:
In conjunction with the accompanying drawings, at first donor antenna inserts duplexer, and connection successively again, ADC down-conversion, feedback interference elimination, DAC up-conversion, mixing and filtering, power amplifier and duplexer are connected to retransmitting antenna; Retransmitting antenna inserts duplexer, connects LNA, mixing and filtering, ADC down-conversion, feedback interference elimination, DAC up-conversion, mixing and filtering, power amplifier and duplexer more successively to donor antenna.Described feedback interference is eliminated the method for handling:
(1) in normal traffic signal, adds one group of particular test signal that has no truck with and do not influence the proper communication business;
(2) this communication traffic signal that has superposeed test signal is launched;
(3) after after a while, in the reception corresponding with the signal emission port
Port will attach the feedback interference signal in the received signal;
(4) this subsidiary there be the input signal of feedback interference and be input to digital signal processing module through the test signal that postpones;
(5) utilize the relation of two groups of signals to carry out calculation process, obtain to be used for the parameter that feedback interference is eliminated,
(6) utilize the parameter that obtains that the feedback interference signal is eliminated processing.
Be example with the CDMA2000 wireless discharging-directly station below, the operation principle of system is as follows:
In down link, towards the antenna received RF signal of base station, through links such as duplexer, filter, LNA, analog frequency mixings, the analog intermediate frequency of one 70 ~ 140 MHz of output.Analog if signal is converted to wideband digital signal through the sampling (the general use owed sampling) of high-speed ADC, enters the Digital Signal Processing stage.Wideband digital signal is after Digital Down Convert, and carrier wave wherein is separated and move base band respectively.
Baseband signal enters the feedback interference cancellation module and handles.Baseband signal after the processing is through Digital Up Convert, multicarrier merging becoming wideband digital signal; Pass through modules such as high-speed DAC, mixing, filter, power amplifier again, become the stronger radiofrequency signal of power, be sent to transmitting antenna, the weak signal zone is covered.
Up link is similar to Signal Processing and down link, and the wireless discharging-directly station up-downgoing with feedback interference elimination function designs as shown in Figure 1.To processing such as down-conversion, automatic electric-level control on the filtering of signal, mixing, amplification, ADC/DAC, the numeral, it all is the method that adopts the digital high-frequency amplification station those skilled in the art to expect easily, here repeat no more, do and stress signal being done method that feedback interference eliminate to handle below in base band.
The feedback interference cancellation module to the processing block diagram of baseband signal as shown in Figure 2.The basic principle that feedback interference is eliminated is that the feedback interference signal of input signal that has feedback interference and inside modules simulation regeneration is done additive operation.The method of feedback interference signal imitation regeneration is that module output signal produces through the FIR filter, and the transmission characteristic of this FIR filter is near time-delay between the device external dual-mode antenna and amplitude transmission characteristic.The parameter of FIR filter is produced by one group of related operation device and cumulative mean device and upgrades.Related operation produces and joins test signal and the receiving end signal in transmitting at inside modules; Test signal and normal traffic signal are uncorrelated, also can not disturb normal traffic signal.Test signal is the pseudorandom M sequence through the amplitude conversion.
Simple received signal (sample of signal speed is 2.4576Msps) is in not loss through with the subtraction module of feedback interference signal of regeneration the time, because if do not have feedback interference, the interference signal of internal simulation regeneration also levels off to zero.Through after the subtraction module, signal can pass through summation module; Here, signal be coupled with a pseudorandom M sequence through the amplitude conversion (sample of signal speed is identical with baseband signal, is 2.4576Msps.The feedback interference of bringing for the reverberation of handling 800 meters of the distances that may exist, the repetition time length (1600 meters of the time electromagnetic wave propagations of 5.33us) that needs the M sequence to have to be not less than 5.33us approximately, the length 2^N-1 of M sequence obtains N thus and gets and be not less than 4 integer.Why will carry out the amplitude conversion is exactly in order to make this test signal neither can disturb proper communication, has enough intensity again and is convenient to detect).Like this, just transmitted by pseudorandom M sequence mark.When signal is launched from antenna, can some feed back to reception antenna inevitably, be mixed into input port with normal received signal.Compare this mixed signal and its pseudorandom M sequence of mark originally, the time and the amplitude characteristic of the feedback interference signal that just can obtain comprising in the mixed signal by related operation.After adding up on average,, module output signal is carried out filtering to the result of related operation, just obtained the feedback interference signal of simulation regeneration as the coefficient of FIR filter.
So, the just normal operation of module has been got up, and actual test obtains more than the big 25dB of feedback interference signal intensity ratio normal input signal intensity, and system does not have self-excitation, and the module effect is obvious, and big practical value is arranged.
Foregoing; it only is preferred embodiment of the present utility model; be not to be used to limit embodiment of the present utility model; those of ordinary skills are according to main design of the present utility model and spirit; protection range of the present utility model can carry out corresponding flexible and adjustment very easily, so should be as the criterion with the desired protection range of claims.
Described feedback interference is eliminated the method for handling:
(1) in normal traffic signal, adds one group of particular test signal that has no truck with and do not influence the proper communication business;
(2) this communication traffic signal that has superposeed test signal is launched;
(3) after after a while, in the reception corresponding with the signal emission port
Port will attach the feedback interference signal in the received signal;
(4) this subsidiary there be the input signal of feedback interference and be input to digital signal processing module through the test signal that postpones;
(5) utilize the relation of two groups of signals to carry out calculation process, obtain to be used for the parameter that feedback interference is eliminated,
(6) utilize the parameter that obtains that the feedback interference signal is eliminated processing.
Claims (2)
1. one kind has the wireless discharging-directly station that feedback interference is eliminated function, it is characterized in that: at first donor antenna inserts duplexer, connect LNA, mixing and filtering, ADC down-conversion, feedback interference elimination, DAC up-conversion, mixing and filtering, power amplifier and duplexer more successively, be connected to retransmitting antenna; Retransmitting antenna inserts duplexer, connects LNA, mixing and filtering, ADC down-conversion, feedback interference elimination, DAC up-conversion, mixing and filtering, power amplifier and duplexer more successively to donor antenna.
2. the wireless discharging-directly station with feedback interference elimination function according to claim 1, it is characterized in that: normal traffic signal is the communication standard signal, comprises GSM, CDMA, WCDMA and TD-SCDMA.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020534821 CN201781489U (en) | 2010-09-19 | 2010-09-19 | Wireless repeater with function of eliminating feedback interference signals |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201020534821 CN201781489U (en) | 2010-09-19 | 2010-09-19 | Wireless repeater with function of eliminating feedback interference signals |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201781489U true CN201781489U (en) | 2011-03-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201020534821 Expired - Lifetime CN201781489U (en) | 2010-09-19 | 2010-09-19 | Wireless repeater with function of eliminating feedback interference signals |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199880A (en) * | 2013-02-28 | 2013-07-10 | 北京国泰半球科技有限公司 | Self-adaptation zero-setting antenna system |
| CN104301266A (en) * | 2014-10-27 | 2015-01-21 | 成都锐新科技有限公司 | Microwave radio frequency remote covering system |
| CN106713195A (en) * | 2015-11-12 | 2017-05-24 | 中兴通讯股份有限公司 | Microwave digital predistortion processing feedback circuit, closed-loop circuit, receiver and transmitter |
-
2010
- 2010-09-19 CN CN 201020534821 patent/CN201781489U/en not_active Expired - Lifetime
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103199880A (en) * | 2013-02-28 | 2013-07-10 | 北京国泰半球科技有限公司 | Self-adaptation zero-setting antenna system |
| CN104301266A (en) * | 2014-10-27 | 2015-01-21 | 成都锐新科技有限公司 | Microwave radio frequency remote covering system |
| CN104301266B (en) * | 2014-10-27 | 2017-10-10 | 成都锐新科技有限公司 | A kind of microwave radio remote covering system |
| CN106713195A (en) * | 2015-11-12 | 2017-05-24 | 中兴通讯股份有限公司 | Microwave digital predistortion processing feedback circuit, closed-loop circuit, receiver and transmitter |
| CN106713195B (en) * | 2015-11-12 | 2020-06-12 | 中兴通讯股份有限公司 | Microwave digital predistortion processing feedback circuit, closed loop circuit and transmitter and receiver |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C56 | Change in the name or address of the patentee |
Owner name: CHINA YOUKE COMMUNICATION TECHNOLOGY CO., LTD. Free format text: FORMER NAME: FUJIAN YOUKE COMMUNICATION TECHNOLOGY CO., LTD. |
|
| CP01 | Change in the name or title of a patent holder |
Address after: 350001, No. 6, 1, Science Park, Cangshan District, Fujian, Fuzhou Patentee after: China Youke Communication Technology Co., Ltd. Address before: 350001, No. 6, 1, Science Park, Cangshan District, Fujian, Fuzhou Patentee before: Fujian Youke Communication Technology Co., Ltd. |
|
| CX01 | Expiry of patent term |
Granted publication date: 20110330 |
|
| CX01 | Expiry of patent term |