CN203537388U - LTE repeater for performing self test on isolation degree and modulating gain - Google Patents
LTE repeater for performing self test on isolation degree and modulating gain Download PDFInfo
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- CN203537388U CN203537388U CN201320689168.9U CN201320689168U CN203537388U CN 203537388 U CN203537388 U CN 203537388U CN 201320689168 U CN201320689168 U CN 201320689168U CN 203537388 U CN203537388 U CN 203537388U
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Abstract
The utility model provides an LTE repeater for performing self test on isolation degree and modulating gain, which comprises an uplink and a downlink. A first directional coupler and a second directional coupler are respectively arranged at a part between a first diplexer and an antenna and a part between a second diplexer and the antenna. An attenuator is arranged between a low-noise amplifier and an intermediate-frequency filtering module. The input end of the attenuator is connected with the output end of a single-chip microcomputer. The input end of the single-chip microcomputer is connected with the output ends of a first detector tube and a second detector tube respectively. A local oscillator signal source is connected with the second directional coupler through a second amplifier and the second detector tube. The output end of the first directional coupler is connected with the first detector tube through a third amplifier and a second filter successively. Through detecting the detecting and receiving powers of the local oscillator signal and adjusting gain of the repeater by means of the attenuator, self excitation of the repeater is realized so that the repeater can stably operate for a long time period.
Description
Technical field
The utility model relates to communication technical field, is specifically related to a kind of isolation carry out the LTE repeater of gain modulation of testing oneself.
Background technology
In Modern wireless communication, repeater belongs to frequency multiplying arrangement, refers to and in wireless communication transmissions process, plays a kind of radio transmission transferring equipment that signal strengthens.According to the difference of repeater working method, repeater is divided into wireless transmission repeater, Optical Fiber Transmission repeater, shift frequency transmission repeater etc.Wherein wireless transmission repeater have easy for installation, invest the advantages such as less, addressing is simple, be widely used in base station and be difficult to the He Ruo district, blind area covering, as various places such as market, airport, harbour, station, subway, tunnel, highways, can improve communication quality, solve the problems such as call drop.
At present, development along with 3G project, LTE (Long Term Evolution, Long Term Evolution) project is the evolution of 3G, it is a transition between 3G and 4G technology, it adopts OFDM and MIMO as the sole criterion of its wireless network evolution, improves and strengthened the aerial access technology of 3G.In the process of construction of LTE network, on market, need a large amount of equipment to support the covering of LTE network, wireless discharging-directly station is widely used.
The isolation of wireless discharging-directly station mainly refers to the isolation between donor antenna and retransmitting antenna, and owing to having two slave antennas in a radio repeater system, it is particularly important that isolation between antennae just seems.When the donor antenna of repeater and the isolation of retransmitting antenna are when inadequate, can produce self-excitation, the lighter causes speech quality variation, falls rate increase etc.; Serious situation can be blocked base station, makes the whole forfeiture service function in signal source location.Therefore in the Installation and Debugging process of repeater, the isolation of repeater is a very important parameter, must meet index and preferably leave certain surplus, guarantees the normal work of repeater.
The measurement of repeater isolation is general in project implementing process two large classes: a class is to use signal source and frequency spectrograph to measure when the Installation and Debugging of repeater, the signal of repeater working frequency range signal source being produced by donor antenna is launched, by retransmitting antenna, signal is received and passes to frequency spectrograph again, the difference power of this two signal is the isolation of antenna.The method is measured comparatively accurate, but need to when debugging, carry signal source and frequency spectrograph, implements inconvenient.Another kind of is the function of directly in the design of repeater, isolation degree test module substitution signal source and frequency spectrograph being installed, and makes it directly to test isolation.It uses more for convenience, but in actual design process, exists the problem of modular structure complexity, and repeater cost is improved, and is unfavorable for the utilization of repeater.
Utility model content
The utility model is according to above actual conditions, a kind of LTE repeater of test oneself isolation modulation gain has been proposed, the utility model can carry out in real time the measurement of isolation between antennas when equipment is installed, according to isolation size, signal gain is fed back to modulation, have design succinct, economy is feature accurately.
The utility model solves the scheme that its technical problem adopts: a kind of LTE repeater of test oneself isolation modulation gain, comprise up link and down link, signal in described up link and down link all passes through first duplexer successively, low noise amplifier, intermediate frequency filtering module, the 3rd filter, power amplifier, the second duplexer, antenna sends, described first duplexer, between the second duplexer and antenna, be respectively equipped with the first directional coupler, the second directional coupler, between described low noise amplifier and intermediate frequency filtering module, be provided with attenuator, the input of described attenuator is connected with the output of single-chip microcomputer for isolation judgement, and the input of described single-chip microcomputer is connected with first detection tube of power of local oscillation signal for detection of the generation of local oscillation signal source, the output of the second detection tube respectively, described local oscillation signal source is connected with the second directional coupler by the second amplifier, the second detection tube, the output of described the first directional coupler is connected with the first detection tube by the 3rd amplifier, the second filter successively.
Further, between described attenuator and intermediate frequency filtering module, be provided with the first filter.
Further, described intermediate frequency filtering module comprises the first frequency mixer, and the output of described the first frequency mixer is connected with the second frequency mixer by the first amplifier, intermediate-frequency filter successively.
Further, the output in described local oscillation signal source is connected with the first frequency mixer in intermediate frequency filtering module, the input of the second frequency mixer respectively.
The utility model increases the local oscillation signal that produced by local oscillation signal source as test signal in the up link of LTE repeater or down link, local oscillation signal is separated and leads up to amplifier and amplify, then through detection tube, its power is detected and through directional coupler, is coupled to antenna again and sends, the power signal of its detection sends to single-chip microcomputer; The signal sending is coupled out through another antenna reception and through directional coupler that a road signal amplifies again, filtering, and then it is carried out to power detection; Single-chip microcomputer is processed the level signal of these two signal powers and is judged whether isolation between antennas meets designing requirement; If do not met, the attenuator of Micro Controller Unit (MCU) driving variable gain carries out the gain of regulating and controlling repeater, thereby reaches the object of eliminating due to inadequate the produced signal self-excitation of isolation between antennas.
Advantage of the present utility model has:
1, the utility model can be realized the introspection of LTE repeater isolation, in project implementing process, without carrying instrument, without professional, debugs, thereby simplified, constructs and has saved cost.
2, the utility model adopts local oscillation signal as test signal, without add other signal source in repeater, has optimized design, has reduced production cost.
Whether the isolation that 3, the utility model carries out real-time judge repeater according to the local oscillation signal power detecting is up to standard, then by the adjusting of the attenuator of variable gain being reduced to the gain of repeater, reach the effect of erasure signal self-excitation, can keep the work of repeater long-term stability.
4, the utility model does not affect the normal work of the amplification, transmission etc. of signal of communication on the test of isolation between antennas, and can carry out work with signal of communication simultaneously.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the utility model is further illustrated:
Fig. 1 is up link fundamental diagram of the present utility model.
Embodiment
The present embodiment be take up link as example describes, and also can be placed on the test of carrying out isolation in down link, and its setting is identical with principle.
As shown in Figure 1, signal in the up link of LTE repeater of isolation modulation gain of testing oneself successively by first duplexer 2-1, low noise amplifier 3, intermediate frequency filtering module, the 3rd filter 5-3, power amplifier 12, a second duplexer 2-2, sends finally by executing antenna after retransmitting antenna receives.Wherein between first duplexer 2-1, the second duplexer 2-2 and antenna, be respectively equipped with the first directional coupler 1-1, the second directional coupler 1-2, between low noise amplifier 3 and intermediate frequency filtering module, be provided with attenuator 4 and the first filter 5-1; The input of described attenuator 4 is connected with the output of single-chip microcomputer 9 for isolation judgement, and the input of described single-chip microcomputer 9 is connected with the first detection tube 8-1 of the power of local oscillation signal for detection of 10 generations of local oscillation signal source, the output of the second detection tube 8-2 respectively; Described local oscillation signal source 10 is connected with the second directional coupler 1-2 by the second amplifier 7-2, the second detection tube 8-2; The output of described the first directional coupler 1-1 is connected with the first detection tube 8-1 by the 3rd amplifier 7-3, the second filter 5-2 successively.
Further, described intermediate frequency filtering module comprises the first frequency mixer 6-1, and the output of described the first frequency mixer 6-1 is connected with the second frequency mixer 6-2 by the first amplifier 7-1, intermediate-frequency filter 11 successively; The output in local oscillation signal source 10 is connected with the first frequency mixer 6-1 of intermediate frequency filtering module, the input of the second frequency mixer 6-2 respectively.
The utility model increases the local oscillation signal that produced by local oscillation signal source 10 as test signal in the up link of LTE repeater, local oscillation signal is separated and leads up to the second amplifier 7-2 and amplify, then through the second detection tube 8-2, its power is detected and through the second directional coupler 1-2, is coupled to donor antenna again and sends, the power signal of its detection sends to single-chip microcomputer 9; The signal sending receives and is coupled out a road signal through the first directional coupler 1-1 through retransmitting antenna and through the 3rd amplifier 7-3 amplification, the second filter 5-2 filtering, obtains local oscillation signal, then with the first detection tube 8-1, it is carried out to power detection after processing again; Single-chip microcomputer 9 is processed the level signal of the power of these two local oscillation signals and is judged whether isolation between antennas meets designing requirement; If do not met, single-chip microcomputer 9 drives the attenuator 4 of variable gain to carry out the gain of regulating and controlling repeater, thereby reaches the object of eliminating due to inadequate the produced signal self-excitation of isolation between antennas.
In real work, the operating frequency of equipment is A, and local oscillation signal frequency is B.Known according to isolation between antennas formula, the operation wavelength of isolation and antenna is relevant, in the situation that A and B are more or less the same, can be used as signal source with local oscillation signal and carry out isolation detection.And do not affect the work such as normal amplification, transmission of signal of communication adding of local oscillation signal, and eliminated the self-excitation impact of signal of communication, guaranteed the work of repeater long-term stability.
While using local oscillation signal to make signal source, after amplifying signal, send again, before sending, need to detect the now watt level of local oscillation signal with detection tube.Local oscillation signal sends by donor antenna together with signal of communication, retransmitted antenna reception after spatial, after being coupled by directional coupler, a part of tiny signal is amplified by amplifier, use other unwanted signals of filter filtering, remaining local oscillation signal detects its power with detection tube more again.Suppose that power when local oscillation signal sends is X, can decay Y after spatial, after retransmitting antenna receives and the gain of amplifying through amplifier be Z(wherein Z can obtain by actual measurement), the power finally detecting is W, the Y=X+Z-W that decays, Y is isolation between antennas.By single-chip microcomputer, the power level of two local oscillation signals is compared, whether the isolation that judges antenna meets standard, if isolation is on the low side, by attenuator, the system gain of repeater is adjusted, the gain of system is reduced, thereby isolation is met the requirements, also eliminate the self-excitation Effect of repeater, guaranteed the normal work of repeater.
Above embodiment is not limited only to protection range of the present utility model, all based on basic thought of the present utility model, modify or change all belong to protection range of the present utility model.
Claims (4)
1. the LTE repeater of test oneself isolation modulation gain, comprise up link and down link, signal in described up link and down link is all successively by first duplexer (2-1), low noise amplifier (3), intermediate frequency filtering module, the 3rd filter (5-3), power amplifier (12), the second duplexer (2-2), antenna sends, it is characterized in that: described first duplexer (2-1), between the second duplexer (2-2) and antenna, be respectively equipped with the first directional coupler (1-1), the second directional coupler (1-2), between described low noise amplifier (3) and intermediate frequency filtering module, be provided with attenuator (4), the input of described attenuator (4) is connected with the output of single-chip microcomputer (9) for isolation judgement, and the input of described single-chip microcomputer (9) is connected with first detection tube (8-1) of power of local oscillation signal for detection of local oscillation signal source (10) generation, the output of the second detection tube (8-2) respectively, described local oscillation signal source (10) is connected with the second directional coupler (1-2) by the second amplifier (7-2), the second detection tube (8-2), the output of described the first directional coupler (1-1) is connected with the first detection tube (8-1) by the 3rd amplifier (7-3), the second filter (5-2) successively.
2. the LTE repeater of test oneself isolation modulation gain according to claim 1, is characterized in that: between described attenuator (4) and intermediate frequency filtering module, be provided with the first filter (5-1).
3. the LTE repeater of test oneself isolation modulation gain according to claim 1 and 2, it is characterized in that: described intermediate frequency filtering module comprises the first frequency mixer (6-1), the output of described the first frequency mixer (6-1) is connected with the second frequency mixer (6-2) by the first amplifier (7-1), intermediate-frequency filter (11) successively.
4. the LTE repeater of test oneself isolation modulation gain according to claim 3, is characterized in that: the output in described local oscillation signal source (10) is connected with first frequency mixer (6-1) of intermediate frequency filtering module, the input of the second frequency mixer (6-2) respectively.
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| CN201320689168.9U CN203537388U (en) | 2013-11-04 | 2013-11-04 | LTE repeater for performing self test on isolation degree and modulating gain |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106209272A (en) * | 2016-07-29 | 2016-12-07 | 中国电子科技集团公司第四十研究所 | A kind of based on double detection LTE signal level closed-loop control devices and method |
| CN106656283A (en) * | 2016-12-21 | 2017-05-10 | 三维通信股份有限公司 | Method for realizing intelligent distributed antenna |
| US20170149489A1 (en) * | 2015-06-11 | 2017-05-25 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
| US9912027B2 (en) | 2015-07-23 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for exchanging communication signals |
| US9948333B2 (en) | 2015-07-23 | 2018-04-17 | At&T Intellectual Property I, L.P. | Method and apparatus for wireless communications to mitigate interference |
| US10142086B2 (en) | 2015-06-11 | 2018-11-27 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
| CN109194419A (en) * | 2018-09-11 | 2019-01-11 | 京信通信系统（中国）有限公司 | One kind opening station method, apparatus, electronic equipment and storage medium |
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- 2013-11-04 CN CN201320689168.9U patent/CN203537388U/en not_active Expired - Fee Related
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| US10659212B2 (en) | 2015-06-11 | 2020-05-19 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
| US20170149489A1 (en) * | 2015-06-11 | 2017-05-25 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
| US10110295B2 (en) * | 2015-06-11 | 2018-10-23 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
| US10142086B2 (en) | 2015-06-11 | 2018-11-27 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
| US10341008B2 (en) | 2015-06-11 | 2019-07-02 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
| US10686516B2 (en) | 2015-06-11 | 2020-06-16 | At&T Intellectual Property I, L.P. | Repeater and methods for use therewith |
| US9912027B2 (en) | 2015-07-23 | 2018-03-06 | At&T Intellectual Property I, L.P. | Method and apparatus for exchanging communication signals |
| US9948333B2 (en) | 2015-07-23 | 2018-04-17 | At&T Intellectual Property I, L.P. | Method and apparatus for wireless communications to mitigate interference |
| CN106209272A (en) * | 2016-07-29 | 2016-12-07 | 中国电子科技集团公司第四十研究所 | A kind of based on double detection LTE signal level closed-loop control devices and method |
| US10811767B2 (en) | 2016-10-21 | 2020-10-20 | At&T Intellectual Property I, L.P. | System and dielectric antenna with convex dielectric radome |
| CN106656283A (en) * | 2016-12-21 | 2017-05-10 | 三维通信股份有限公司 | Method for realizing intelligent distributed antenna |
| CN109194419A (en) * | 2018-09-11 | 2019-01-11 | 京信通信系统（中国）有限公司 | One kind opening station method, apparatus, electronic equipment and storage medium |
| CN109194419B (en) * | 2018-09-11 | 2020-08-28 | 京信通信系统（中国）有限公司 | Station opening method and device, electronic equipment and storage medium |
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