CN107872243A - A kind of Radio Frequency Interfere cancellation element and method - Google Patents

A kind of Radio Frequency Interfere cancellation element and method Download PDF

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Publication number
CN107872243A
CN107872243A CN201610842761.0A CN201610842761A CN107872243A CN 107872243 A CN107872243 A CN 107872243A CN 201610842761 A CN201610842761 A CN 201610842761A CN 107872243 A CN107872243 A CN 107872243A
Authority
CN
China
Prior art keywords
signal
self
interference
coversion
orthogonal
Prior art date
Application number
CN201610842761.0A
Other languages
Chinese (zh)
Inventor
马猛
焦秉立
段晓辉
杨航
Original Assignee
北京大学(天津滨海)新代信息技术研究院
北京大学(天津滨海)新一代信息技术研究院
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 北京大学(天津滨海)新代信息技术研究院, 北京大学(天津滨海)新一代信息技术研究院 filed Critical 北京大学(天津滨海)新代信息技术研究院
Priority to CN201610842761.0A priority Critical patent/CN107872243A/en
Publication of CN107872243A publication Critical patent/CN107872243A/en

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Classifications

    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/06Receivers
    • H04B1/10Means associated with receiver for limiting or suppressing noise or interference
    • H04B1/12Neutralising, balancing, or compensation arrangements
    • H04B1/123Neutralising, balancing, or compensation arrangements using adaptive balancing or compensation means
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B1/00Details of transmission systems, not covered by a single one of groups H04B3/00 - H04B13/00; Details of transmission systems not characterised by the medium used for transmission
    • H04B1/38Transceivers, i.e. devices in which transmitter and receiver form a structural unit and in which at least one part is used for functions of transmitting and receiving
    • H04B1/40Circuits
    • H04B1/54Circuits using the same frequency for two directions of communication
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B15/00Suppression or limitation of noise or interference
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04BTRANSMISSION
    • H04B17/00Monitoring; Testing
    • H04B17/30Monitoring; Testing of propagation channels
    • H04B17/309Measuring or estimating channel quality parameters
    • H04B17/345Interference values
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/14Two-way operation using the same type of signal, i.e. duplex
    • HELECTRICITY
    • H04ELECTRIC COMMUNICATION TECHNIQUE
    • H04LTRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00Arrangements affording multiple use of the transmission path
    • H04L5/14Two-way operation using the same type of signal, i.e. duplex
    • H04L5/1461Suppression of signals in the return path, i.e. bidirectional control circuits

Abstract

Full duplex communication system typically includes reception antenna and transmitting antenna simultaneously, because transmitting-receiving is simultaneously with frequency, so reception antenna while the signal of another equipment transmitting is received, can receive the signal of its own transmission antenna transmitting, referred to as self-interference signal.How key problem that this self-interference signal as full duplex system need solve is eliminated.The present invention relates to based on the down coversion carrier wave full duplex self interference signal clearing method orthogonal with interference signal, and in particular to the method and system that a kind of full duplex self-interference signal eliminates.

Description

A kind of Radio Frequency Interfere cancellation element and method
Technical field
The present invention relates to based on the down coversion carrier wave full duplex self interference signal clearing method orthogonal with interference signal, specifically It is related to the method and system that a kind of full duplex self-interference signal eliminates, belongs to wireless communication field.
Background technology
Full duplex communication system typically includes reception antenna and transmitting antenna simultaneously, because transmitting-receiving is simultaneously with frequency, so connecing Antenna is received while the signal of another equipment transmitting is received, the signal of its own transmission antenna transmitting can be received, be referred to as from dry Disturb signal.How key problem that this self-interference signal as full duplex system need solve is eliminated.
The content of the invention
Reception antenna receives to be needed to use down coversion carrier signal when signal is demodulated, if down coversion carrier wave believed Number it is arranged to orthogonal with self-interference signal, then can eliminates self-interference signal well when signal demodulates.
Technical scheme is as follows:
As shown in figure 1, self-interference is the signal after ovennodulation, if modulated signal is sin (ω t), then self-interference is believed Number it is y (t)=x (t) sin (ω t), if going out in reception antenna with the down-conversion signal orthogonal with modulated signal, such as cos (ω t) It is demodulated, then can suppresses self-interference signal well.
Self-interference signal can be ensured of more accurate y (t)=x (t) sin (ω t), but during reception antenna reception, Because reason, the signals that reception antenna receives such as interference and channel fading might have the change of phase compared with self-interference signal Change, be changed intoIt can be calculated by first passing through channel estimationThen demodulated in receiving terminal When, willPhase placeAs down coversion carrier signal, then re-demodulation.
There are a kind of special circumstances, the useful signal if necessary to receive is just also orthogonal with down coversion carrier signal, then Useful signal and self-interference signal can be eliminated simultaneously.The probability very little that such case occurs, even if occurring, solution is also very Simply, as shown in Fig. 2 the phase of self-interference signal and receiving terminal down coversion carrier signal can be adjusted suitably, while two are kept The phase difference perseverance of person isSo while keeping receiving terminal down coversion carrier signal orthogonal with self-interference signal, it can solve again Recall useful signal.
Advantages of the present invention:Method of the present invention, implement simply, cost is cheap, and effect is fine.Although as above It is described it is possible that can not proper communication situation, but solution is also very simple.
Brief description of the drawings
Fig. 1 System Working Principle block diagrams
Fig. 2 phase adjusted schematic diagrames
Embodiment
(1) self-interference signal produces
The signal that communication node needs to launch is x (t), and modulated signal is sin (ω t), through turning into after ovennodulation from dry Disturb signal y (t)=x (t) sin (ω t).
(2) receiving terminal generates corresponding down coversion carrier signal
Because reason, the self-interference signals received such as interference and channel fading areThrough Cross channel estimation and calculate phase place changeAfterwards, willPhase rotate againObtain down coversion carrier signal
(3) self-interference is eliminated
The down coversion carrier signal that y1 (t) is multiplied by obtain, then carry out LPF and can eliminate self-interference signal
(4) technology extends
If it is just also orthogonal with down coversion carrier signal to run into useful signal, and then leads to not the feelings of proper communication Condition, the appropriate phase for adjusting self-interference signal and receiving terminal down coversion carrier signal, while the phase difference perseverance of both holdings is So while keeping receiving terminal down coversion carrier signal orthogonal with self-interference signal, useful signal can be demodulated again.

Claims (4)

1. based on the self-interference removing method that down coversion carrier signal is orthogonal with receiving interference, it is characterised in that become under receiving terminal Frequency signal is orthogonal with self-interference signal, and self-interference signal can be thoroughly eliminated by the orthogonality of function in receiving terminal.If run into Useful signal situation lucky also orthogonal with down coversion carrier signal, then it can be believed by adjusting self-interference signal and down coversion carrier wave Number phase solve.
2. as claimed in claim 1 based on the down coversion carrier signal self-interference removing method orthogonal with receiving interference, it is special Sign is that self-interference is the signal after ovennodulation, if modulated signal is sin (ω t), then self-interference signal is y (t)=x (t) sin (ω t), it is demodulated if going out in reception antenna with the down-conversion signal orthogonal with modulated signal, such as cos (ω t), then Self-interference signal can be suppressed well.
3. the communication means of the co-frequency co-time duplex based on multiple antennas as claimed in claim 1, it is characterised in that due to interference The change of phase is might have compared with self-interference signal, is changed into reason, the signals that reception antenna receives such as channel fadingsIt can be calculated by first passing through channel estimationThen, will when receiving terminal demodulatesPhase placeAs down coversion carrier signal, then re-demodulation.
4. the communication means of the co-frequency co-time duplex based on multiple antennas as claimed in claim 1, it is characterised in that if run into Need the useful signal that receives just also orthogonal with down coversion carrier signal, useful signal and self-interference signal can eliminate simultaneously Situation can suitably adjust the phase of self-interference signal and receiving terminal down coversion carrier signal, while keep both phase differences permanent ForSo while keeping receiving terminal down coversion carrier signal orthogonal with self-interference signal, useful letter can be demodulated again Number.
CN201610842761.0A 2016-09-23 2016-09-23 A kind of Radio Frequency Interfere cancellation element and method CN107872243A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610842761.0A CN107872243A (en) 2016-09-23 2016-09-23 A kind of Radio Frequency Interfere cancellation element and method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201610842761.0A CN107872243A (en) 2016-09-23 2016-09-23 A kind of Radio Frequency Interfere cancellation element and method

Publications (1)

Publication Number Publication Date
CN107872243A true CN107872243A (en) 2018-04-03

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Application Number Title Priority Date Filing Date
CN201610842761.0A CN107872243A (en) 2016-09-23 2016-09-23 A kind of Radio Frequency Interfere cancellation element and method

Country Status (1)

Country Link
CN (1) CN107872243A (en)

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103248594A (en) * 2012-02-14 2013-08-14 吴嶽 Method for realizing co-frequency full duplex wireless communication
CN103685098A (en) * 2012-09-07 2014-03-26 华为技术有限公司 Method, device and system for processing interference signals
CN105721017A (en) * 2014-12-19 2016-06-29 英特尔公司 Device and method for self-interference cancellation
CN105898783A (en) * 2016-06-07 2016-08-24 北京小米移动软件有限公司 Processing method and device of wireless full-duplex communication self-interference signal

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103248594A (en) * 2012-02-14 2013-08-14 吴嶽 Method for realizing co-frequency full duplex wireless communication
CN103685098A (en) * 2012-09-07 2014-03-26 华为技术有限公司 Method, device and system for processing interference signals
CN105721017A (en) * 2014-12-19 2016-06-29 英特尔公司 Device and method for self-interference cancellation
CN105898783A (en) * 2016-06-07 2016-08-24 北京小米移动软件有限公司 Processing method and device of wireless full-duplex communication self-interference signal

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
徐润炎: "《正交函数系及其有关课题》", 31 July 1987, 大连工学院出版社 *
耿伟彪等: "全双工通信系统中的自干扰消除方法研究", 《邮电设计技术》 *

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Application publication date: 20180403