CN203872199U - Self-interference elimination circuit of wireless combination system - Google Patents

Self-interference elimination circuit of wireless combination system Download PDF

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Publication number
CN203872199U
CN203872199U CN201420017654.0U CN201420017654U CN203872199U CN 203872199 U CN203872199 U CN 203872199U CN 201420017654 U CN201420017654 U CN 201420017654U CN 203872199 U CN203872199 U CN 203872199U
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CN
China
Prior art keywords
coupler
self
interference
circuit
input
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Application number
CN201420017654.0U
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Chinese (zh)
Inventor
刘华
李国庆
姚林
刘燕美
王海燕
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郑州航空工业管理学院
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Priority to CN201420017654.0U priority Critical patent/CN203872199U/en
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Publication of CN203872199U publication Critical patent/CN203872199U/en

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Abstract

The utility model discloses a self-interference elimination circuit of a wireless combination system. The circuit is disposed between a transmission antenna and a receiving antenna of the wireless combination system. The circuit comprises a first coupler, a phase adjusting chip, a controllable attenuator, a second coupler and a combiner, wherein the above five parts are successively connected with each other. The coupling end and the output end of the first coupler are respectively connected to the phase adjusting chip and the transmission antenna. The circuit further comprises a first wave detector, a third coupler, and a second wave detector. The first wave detector is connected between the coupling end of the second coupler and the input end of the controllable attenuator. The input end of the third coupler is connected to the receiving antenna, and the output end of the third coupler is connected to one input end of the combiner. The second wave detector is connected between the coupling end of the third coupler and the input end of the controllable attenuator. The circuit is simple in structure and good in self-interference signal elimination effects, and provides actual conditions for the wireless communication system to utilize fully duplex communication.

Description

The self-interference of wireless communication system is eliminated circuit

Technical field

The utility model relates to wireless communication system, and the self-interference that especially relates to a kind of wireless communication system is eliminated circuit.

Background technology

Wireless communication system is comprised of transmitting apparatus, receiving equipment and wireless channel three parts, utilizes radio magnetic wave to realize the system of information and transfer of data.Wireless communication system is generally divided into Frequency Division Duplexing (FDD) (Frequency Division Duplex, FDD) and time division duplex (Time Division Duplex, TDD), these two kinds of duplex modes.Time division duplex is also referred to as half-duplex, only need a channel, transmission information all adopts this same channel downwards or upwards, because transmitter and receiver can not operate simultaneously, therefore can not produce and disturb between transmitting apparatus and receiving equipment under time division duplex working method.Frequency Division Duplexing (FDD) is also referred to as full duplex; during operation, need two independently channels: a channel is used for transmitting information downwards; one other channel is used for upwards transmission information, and two interchannels exist a protection frequency range, to prevent producing phase mutual interference between contiguous transmitter and receiver.

But, while adopting full-duplex communication mode, because transmitting antenna and the reception antenna distance of transmitting apparatus are relatively near, so the signal of transmitting can be received antenna reception, and the power of the power ratio of self-interference signal reception normal signal is much larger, thereby have a strong impact on receiving equipment and receive normal signal of communication, cause full-duplex communication because existing comparatively serious self-interference cannot popularize use.

Utility model content

For overcoming the defect of prior art, the self-interference that the utility model proposes a kind of wireless communication system is eliminated circuit, by producing, equates and the signal that offsets of single spin-echo is eliminated self-interference signal with self-interference signal power.

The utility model adopts following technical scheme to realize: a kind of self-interference of wireless communication system is eliminated circuit, this self-interference is eliminated circuit and is arranged between the transmitting antenna and reception antenna of wireless communication system, this self-interference is eliminated circuit and is comprised: the first coupler, phase modulation chip, controllable attenuator, the second coupler and the mixer that are connected successively, and the coupled end of the first coupler is connected respectively phase modulation chip and transmitting antenna with output; Be connected to the coupled end of the second coupler and the first detector between controllable attenuator input; Input connects the 3rd coupler of reception antenna, an input of output connection mixer; Be connected to the coupled end of the 3rd coupler and the second detector between controllable attenuator input.

Wherein, the self-interference of described wireless communication system elimination circuit also comprises: be connected to the coupled end of the first coupler and the amplifier between controllable attenuator, the output of this amplifier is connected to the input of controllable attenuator.

Wherein, controllable attenuator is voltage-controlled attenuator.

Wherein, this voltage-controlled attenuator connects one for regulating the toggle switch of voltage-controlled attenuator operating voltage.

Compared with prior art, the utlity model has following beneficial effect:

The utility model is in adopting the wireless communication system of full duplex work, self-interference is set between transmitting antenna and reception antenna and eliminates circuit, utilize self-interference to eliminate circuit and carry out the elimination of radio frequency self-interference, though can not eliminate self-interference signal completely, can reduce significantly the intensity of self-interference signal.The utlity model has preferably advantage of simple in structure, self-interference signal eradicating efficacy, is the realization condition that provides that wireless communication system adopts full-duplex communication.

Accompanying drawing explanation

Fig. 1 is structural representation of the present utility model;

Fig. 2 is circuit block diagram of the present utility model.

Embodiment

As shown in Figure 1, the utility model is in adopting the wireless communication system of full duplex work, self-interference is set between transmitting antenna 1 and reception antenna 2 and eliminates circuit 3, utilize self-interference to eliminate circuit 3 and carry out the elimination of radio frequency self-interference, though can not eliminate self-interference signal completely, can reduce significantly the intensity of self-interference signal.

Shown in Fig. 2, self-interference is eliminated circuit 3 and is specifically comprised: the first coupler 31, phase modulation chip 32, controllable attenuator 33, the second coupler 34 and the mixer 38 that are connected successively, be connected to the first detector 35 between the second coupler 34 and controllable attenuator 33, be connected to the 3rd coupler 36 between reception antenna 2 and mixer 38, be connected to the second detector 37 between the 3rd coupler 36 and controllable attenuator 33.

The first coupler 31, the second coupler 34 and the 3rd coupler 36 are all directional couplers of three ports, comprise an input, a coupling output (abbreviation coupled end) and an output.According to the transmitting power of transmitting antenna 1 and big or small with the received power of reception antenna 2, select the first suitable coupler 31.If the first coupler 31 coupled powers are too small, even also little than the self-interference signal receiving, will introduce amplifier during Modulating Power so, between the coupled end of the first coupler 31 and controllable attenuator 33, access amplifier, the output of amplifier is connected to the input of controllable attenuator 33, and transmitting after coupling carried out power adjustment by entering controllable attenuator 33 after amplifier.But amplifier is all to have nonlinearly, avoids using as far as possible.So the large 10dB of the self-interference signal power left and right that the power of coupling must receive than reception antenna 2, thereby facilitate controllable attenuator 33 to carry out power adjustments.

The first coupler 31 connects transmitting antennas 1, due to the about 20dB that can decay of power between transmitting antenna 1 and reception antenna 2, therefore the coupling coefficient of the first coupler 31 only needs 10dB above, affects hardly the transmitting power of normal signal.Transmit and be divided into 2 tunnels through the first coupler 31, the output of the output of the first coupler 31 riches all the way penetrate signal through transmitting antenna 1 with emission of radio frequency signals, transmitting to phase modulation chip 32 after the coupling of the coupled end of the first coupler 31 output other end; Phase modulation chip 32 will transmit after anti-phase processing and send controllable attenuator 33 to, by 33 pairs of controllable attenuator, be transmitted and will be carried out power adjustments, and output offsets signal.The second coupler 34 is coupled the output signal of controllable attenuator 33, the coupled end of the second coupler 34 directly connects mixer 38, and the feedback end of the second coupler 34 connects first detector 35, the first detecting circuit that signal is corresponding that offsets that is detected controllable attenuator 33 outputs by first detector 35, the size of this first detecting circuit is directly proportional to the watt level that offsets signal of controllable attenuator 33 outputs.In addition, reception antenna 2 receives after radiofrequency signal, output receives signal to the three couplers 36, the output of the 3rd coupler 36 connects mixer 38, and the coupled end of the 3rd coupler 36 connects second detector 37, by second detector 37, detect the second detecting circuit of corresponding reception signal and export controllable attenuator 33 to.Mixer 38 by reception signal with offset signal and close road, thereby eliminate the self-interference signal receiving in signal.

In addition, controllable attenuator 33 is voltage-controlled attenuator, this voltage-controlled attenuator connects the toggle switch of the operating voltage of an adjusting voltage-controlled attenuator, by regulating toggle switch to regulate the operating voltage of voltage-controlled attenuator, make the equal and opposite in direction of the first detecting circuit and the second detecting circuit, thereby regulate the power that offsets signal, make to offset signal and single spin-echo identical with the power of self-interference signal as far as possible, thereby by mixer 38, the signal of self-interference signal and reception is closed to road, in mixer 38, completing self-interference signal offsets, and receive signal exports after mixer 38.

Experiment showed, and adopt the self-interference the utility model proposes to eliminate circuit, self-interference eradicating efficacy is in 15-25dB left and right, and self-interference signal is eliminated substantially.

The foregoing is only preferred embodiment of the present utility model; not in order to limit the utility model; all any modifications of doing within spirit of the present utility model and principle, be equal to and replace and improvement etc., within all should being included in protection range of the present utility model.

Claims (4)

1. the self-interference of a wireless communication system is eliminated circuit, this self-interference is eliminated circuit and is arranged between the transmitting antenna and reception antenna of wireless communication system, it is characterized in that, this self-interference is eliminated circuit and is comprised: the first coupler, phase modulation chip, controllable attenuator, the second coupler and the mixer that are connected successively, and the coupled end of the first coupler is connected respectively phase modulation chip and transmitting antenna with output; Be connected to the coupled end of the second coupler and the first detector between controllable attenuator input; Input connects the 3rd coupler of reception antenna, an input of output connection mixer; Be connected to the coupled end of the 3rd coupler and the second detector between controllable attenuator input.
2. the self-interference of wireless communication system is eliminated circuit according to claim 1, it is characterized in that, also comprises: be connected to the coupled end of the first coupler and the amplifier between controllable attenuator, the output of this amplifier is connected to the input of controllable attenuator.
3. the self-interference of wireless communication system is eliminated circuit according to claim 1, it is characterized in that, controllable attenuator is voltage-controlled attenuator.
4. the self-interference of wireless communication system is eliminated circuit according to claim 3, it is characterized in that, this voltage-controlled attenuator connects one for regulating the toggle switch of voltage-controlled attenuator operating voltage.
CN201420017654.0U 2014-01-13 2014-01-13 Self-interference elimination circuit of wireless combination system CN203872199U (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104506209A (en) * 2014-12-15 2015-04-08 北京邮电大学 Method and system for eliminating full duplex self-interference signals based on coupling line tight coupler
CN105099495A (en) * 2015-08-06 2015-11-25 惠州Tcl移动通信有限公司 Co-time co-frequency full duplex terminal sharing antenna in receiving and transmitting and communication method thereof
CN105119629A (en) * 2015-07-10 2015-12-02 惠州Tcl移动通信有限公司 Simultaneous co-frequency full duplex terminal and system
CN105530027A (en) * 2014-10-17 2016-04-27 财团法人资讯工业策进会 Wireless device for full duplex radios

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105530027A (en) * 2014-10-17 2016-04-27 财团法人资讯工业策进会 Wireless device for full duplex radios
CN104506209A (en) * 2014-12-15 2015-04-08 北京邮电大学 Method and system for eliminating full duplex self-interference signals based on coupling line tight coupler
CN104506209B (en) * 2014-12-15 2017-02-22 北京邮电大学 Method and system for eliminating full duplex self-interference signals based on coupling line tight coupler
CN105119629A (en) * 2015-07-10 2015-12-02 惠州Tcl移动通信有限公司 Simultaneous co-frequency full duplex terminal and system
CN105119629B (en) * 2015-07-10 2018-04-06 惠州Tcl移动通信有限公司 Co-channel full duplex terminal and system simultaneously
CN105099495A (en) * 2015-08-06 2015-11-25 惠州Tcl移动通信有限公司 Co-time co-frequency full duplex terminal sharing antenna in receiving and transmitting and communication method thereof
CN105099495B (en) * 2015-08-06 2018-05-08 惠州Tcl移动通信有限公司 Co-channel full duplex terminal and its communication means while a kind of duplexer

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Granted publication date: 20141008

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