CN106253939A - A kind of based on co-channel full duplex electromagnetic communication method while time reversal - Google Patents

A kind of based on co-channel full duplex electromagnetic communication method while time reversal Download PDF

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Publication number
CN106253939A
CN106253939A CN201610723049.9A CN201610723049A CN106253939A CN 106253939 A CN106253939 A CN 106253939A CN 201610723049 A CN201610723049 A CN 201610723049A CN 106253939 A CN106253939 A CN 106253939A
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antenna
signal
time reversal
channel
communication
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CN201610723049.9A
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CN106253939B (en
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张明
张一明
李家林
王秉中
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University of Electronic Science and Technology of China
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University of Electronic Science and Technology of China
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details 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
    • H04B1/38—Transceivers, 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
    • H04B1/40—Circuits
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B1/00—Details 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
    • H04B1/38—Transceivers, 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
    • H04B1/40—Circuits
    • H04B1/50—Circuits using different frequencies for the two directions of communication
    • H04B1/52—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa
    • H04B1/525—Hybrid arrangements, i.e. arrangements for transition from single-path two-direction transmission to single-direction transmission on each of two paths or vice versa with means for reducing leakage of transmitter signal into the receiver
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L25/00—Baseband systems
    • H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
    • H04L25/08—Modifications for reducing interference; Modifications for reducing effects due to line faults ; Receiver end arrangements for detecting or overcoming line faults
    • H04L25/085—Arrangements for reducing interference in line transmission systems, e.g. by differential transmission
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex

Abstract

The present invention is open a kind of based on co-channel full duplex electromagnetic communication method while time reversal, relates to microwave technical field.The present invention utilizes the space-time of time reversal electromagnetic wave to focus on, super-resolution focus characteristics, and respective for communicating pair Transmitting and Receiving End only need to be made the separation at sub-wavelength interval, can be achieved with effective suppression of the Transmitting and Receiving End self-interference signal of same communication party.Simultaneously, owing to utilizing time reversal technology, even if being spaced in sub-wavelength state between antenna element, while its corresponding transceiver channel is still that independent, therefore the present invention provides, co-channel full duplex communication means can effectively reduce communication module complexity, improve traffic rate, increase power system capacity.

Description

A kind of based on co-channel full duplex electromagnetic communication method while time reversal
Technical field
The present invention relates to microwave technical field and the communications field, be specifically related to a kind of based on complete with frequency while time reversal Duplex electromagnetic communication method.
Background technology
The wireless communication system of current main-stream generally uses the communication pattern of half-duplex (Half-duplex), as the time-division is double Work (Time-division duplexing, TDD) and FDD (Frequency-division duplexing, FDD). Time division duplex uses time-multiplexed mode, by mutually isolated with reception passage for transmission channel in same channel, from the time； FDD is then to use two different channels give transmission channel respectively and receive passage, and realizes in time simultaneously But the transmission-receiving function of different frequencies.In view of traditional half duplex mode of communication cannot realize on the same channel with identical polarization side Information is received and dispatched by formula simultaneously, thus radio spectrum resources not yet obtains and makes full use of.
Co-channel full duplex (Co-time co-frequency full duplexing, the CCFD) side of full duplex simultaneously Formula realizes receiving and dispatching information on the same channel simultaneously, it is thus possible to the availability of frequency spectrum is greatly improved, thus improves communication Speed, increase power system capacity, improve communication efficiency.Further, co-channel full duplex communication simultaneously resists at data throughout, wireless access The many-sides such as conflict ability, Electro Magnetic Compatibility, safety of physical layer all have a clear superiority in.But, high efficiency CCFD will be built Communication still suffers from numerous theoretical question and technical bottleneck, and the elimination of the most high performance self-interference, full-duplex mode are in reality Effectiveness under application scenarios, the building of low complex degree software/hardware full duplex system.Wherein, self-interference eliminates is full duplex The key problem of communication.Now there are some researches show, under full-duplex communication pattern, if the intensity of self-interference signal can effectively press down System, makes the intensity of residue self-interference signal less than more than Background Noise Power 3dB, then the self-interference signal after suppression will not be to logical The end-to-end handling capacity of communication system causes appreciable impact.
At present, in the research of CCFD communication, mainly use multiaerial system, by reasonably arranging the sky of each antenna Between the scheme such as position or the cross polarization characteristics utilizing electromagnetic wave realize the suppression of self-interference.Document [Passive self- interference suppression for full-duplex infrastructure nodes[J].IEEE Transactions on Wireless Communications, 2014,13 (2): 680-694.] propose a kind of employing calmly The method realizing CCFD to antenna method suppression self-interference, it uses the beam antenna of two secondary 90 degree of beam angles, at dual-mode antenna The self-interference suppression of 27.9dB can be realized when 50cm.Document [Two-way (true full-duplex) wireless [C] .CWIT, Toronto, Canada, 2013,33-38.] utilize cross polarization principle, sending and receiving two ends are used different polarization mode Antenna realize the high-isolation between transmitting-receiving, thus suppress the self-interference in CCFD communication process.As it has been described above, current is main Scheme all uses multiple antennas i.e. aerial array, but according to traditional theory, for making multiaerial system obtain good space diversity Gain and spatial multiplex gains, it is desirable to antenna element separation is not less than half operation wavelength, ultimately results in shared by receiving and transmitting front end Space is relatively big, and this disagrees with this development trend of mobile terminal miniaturization.
Time reversal (Time reversal, TR) electromagnetism is the electromagnetism new direction that development in recent years is got up.Research table Bright, symmetry based on Maxwell equation, the time domain electromagnetic ripple received by receptor is launched after carrying out inverse time process again, electric Magnetic wave will show time-space synchronizing focus characteristic automatically at former source point.The Space Time of TR electromagnetic wave focuses on, super-resolution Focus characteristics is it would be possible to bring revolutionary change for wireless messages technology, and it is in Large Copacity, high-rate wireless communication field, for In intersymbol interference suppression, co-channel interference suppression, MPI suppression in complex environment, the confined space, intensive independent channel builds Brand-new solution route is provided etc. a series of difficult problems.Meanwhile, utilize time reversal communication technology, even if between antenna element Being interposed between sub-wavelength state, its corresponding transceiver channel is still that independent.If TR electromagnetic communication being incorporated in CCFD communication, then It can be self-interference a kind of brand-new scheme of suppression offer of this kind of communication.
Summary of the invention
For solving the relevant issues of above-mentioned prior art, the present invention adopts the following technical scheme that
A kind of based on co-channel full duplex electromagnetic communication method while time reversal, its principle topology is as it is shown in figure 1, communicate Both sides are designated as A end, B end respectively, and every one end all comprises reception antenna (RA、RB) and launch antenna (TA、TB), specifically include following Step:
Step 1, for communication party's A end, at its reception antenna RAUpper excitation rises and launches one for testing channel Detectable signal HA(t), the transmitting antenna T of communication the opposing party's i.e. B endBThis detectable signal H can be receivedA(t)；
Step 2, the B end detectable signal H to receivingAT () carries out time reversal operation, obtain time reversal signal；
Step 3, at B end, needed the signal transmitting the information of carrying to A end and the time reversal letter described in step 2 Signal S is obtained after number carrying out convolution operationBT (), via the transmitting antenna T of B endBBy signal SBT () launches；Signal SB(t) After space propagation, the reception antenna R of A end can be focused onAPlace, be achieved in B end to A end information transmit；
Step 4, according to method described in step 1 to step 3, A end to the information of B end can be realized simultaneously and transmit；
Due to the super-resolution focus characteristic of time reversal electromagnetic wave, the channel of B each antenna of end is independent, i.e. launches sky Line TBThe signal S launchedBT () will not leak to the reception antenna R of B end in theoryBOn；In like manner, A end launches antenna TASent out The signal S penetratedAT () the most also will not leak to the reception antenna R of A endAOn, thus can effectively suppress same communication party from Interference signal, it is achieved co-channel full duplex communication simultaneously.
Further, for ensureing the focusing effect of time reversal electromagnetic wave, the transmitting antenna T of communicating pairA、TBIt is bag Containing the array antenna no less than 3 antenna elements.
The invention has the beneficial effects as follows:
The present invention utilizes time reversal distinctive time-space focus characteristics to realize in co-channel full duplex communication simultaneously from dry Disturb effective suppression of signal；Simultaneously as use time reversal technology, even if being spaced in of communicating pair sending and receiving antenna element Sub-wavelength state, its corresponding transceiver channel is still that independent, therefore reduces communication module complexity, improves communication speed Rate, the power system capacity that increases, be also that the miniaturization of mobile terminal provides guarantee.
Accompanying drawing explanation
The principle topological diagram of co-channel full duplex electromagnetic communication method while Fig. 1 present invention offer.
The principle topological diagram of co-channel full duplex electromagnetic communication method while the offer of Fig. 2 embodiment of the present invention.
Detailed description of the invention
Embodiment
While the present embodiment offer, the principle topology of co-channel full duplex communication means is as in figure 2 it is shown, use following technology Scheme:
It is a kind of that based on co-channel full duplex electromagnetic communication method while time reversal, communicating pair is designated as A end, B end respectively, Every one end all comprises reception antenna (RA、RB) and launch antenna (TA、TB), described transmitting antenna TA、TBIt is and includes 3 antennas Unit, array antenna in sub-wavelength layout pitch, specifically include following steps:
Step 1, for communication party's A end, at its reception antenna RAUpper excitation rises and launches one for testing channel Detectable signal HA(t), after space channel transmits, the transmitting antenna T of communication the opposing party's i.e. B endBThis detection letter can be received Number:
X A ( t ) = H A ( t ) ⊗ h n ( t ) ,
Wherein hnT () is channel impulse response,For convolution operation；
Step 2, the B end detectable signal X to receivingAT () carries out time reversal operation, obtain time reversal signal:
X A ( - t ) = H A ( - t ) ⊗ h n ( - t ) ;
Step 3, at B end, needed signal i (t) transmitting the information of carrying to A end anti-with the time described in step 2 Drill signal XA(-t) obtains signal after carrying out convolution operationTransmitting antenna T via B endBBy signal SB T () launches；Signal SBT (), after space channel transmits, can focus on the reception antenna R of A endAPlace, is achieved in B end Information to A end is transmitted；
Step 4, according to method described in step 1 to step 3, A end to the information of B end can be realized simultaneously and transmit；
Due to the super-resolution focus characteristic of time reversal electromagnetic wave, the channel of B each antenna of end is independent, i.e. launches sky Line TBThe signal S launchedBT () will not leak to the reception antenna R of B end in theoryBOn；In like manner, A end transmitting antenna is launched Signal SAT () the most also will not leak to the reception antenna R of A endAOn, thus can effectively suppress certainly doing of same communication party Disturb signal, it is achieved co-channel full duplex communication simultaneously.

Claims (2)

1., based on a co-channel full duplex electromagnetic communication method while time reversal, communicating pair is designated as A end, B end respectively, often One end all comprises reception antenna (RA、RB) and launch antenna (TA、TB), specifically include following steps:
Step 1, for communication party's A end, at its reception antenna RAUpper excitation rises and launches one to be believed for testing the detection of channel Number HA(t), the transmitting antenna T of communication the opposing party's i.e. B endBThis detectable signal H can be receivedA(t)；
Step 2, the B end detectable signal H to receivingAT () carries out time reversal operation, obtain time reversal signal；
Step 3, at B end, needed the signal of information of carrying transmitted to A end to enter with the time reversal signal described in step 2 Signal S is obtained after row convolution operationBT (), via the transmitting antenna T of B endBBy signal SBT () launches；Signal SBT () passes through After space propagation, the reception antenna R of A end can be focused onAPlace, be achieved in B end to A end information transmit；
Step 4, according to method described in step 1 to step 3, A end to the information of B end can be realized simultaneously and transmit；
Due to the super-resolution focus characteristic of time reversal electromagnetic wave, the channel of B each antenna of end is independent, i.e. launches antenna TB The signal S launchedBT () will not leak to the reception antenna R of B end in theoryBOn；In like manner, A end launches the letter that antenna is launched Number SAT () the most also will not leak to the reception antenna R of A endAOn, thus can effectively suppress the self-interference of same communication party to believe Number, it is achieved co-channel full duplex communication simultaneously.
It is the most according to claim 1 based on co-channel full duplex electromagnetic communication method while time reversal, it is characterised in that The transmitting antenna T of communicating pairA、TBIt is and comprises no less than 3 antenna elements, array antenna in sub-wavelength layout pitch.
CN201610723049.9A 2016-08-25 2016-08-25 One kind being based on co-channel full duplex electromagnetic communication method while time reversal Expired - Fee Related CN106253939B (en)

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CN114826335A (en) * 2022-04-28 2022-07-29 西安工业大学 Near-field magnetic wafer full-duplex unauthorized magnetic communication method

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WO2020215893A1 (en) * 2019-04-25 2020-10-29 华为技术有限公司 Full-duplex self-interference cancellation method and apparatus
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CN114826335A (en) * 2022-04-28 2022-07-29 西安工业大学 Near-field magnetic wafer full-duplex unauthorized magnetic communication method

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