CN106253939B - One kind being based on co-channel full duplex electromagnetic communication method while time reversal - Google Patents
One kind being based on co-channel full duplex electromagnetic communication method while time reversal Download PDFInfo
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- CN106253939B CN106253939B CN201610723049.9A CN201610723049A CN106253939B CN 106253939 B CN106253939 B CN 106253939B CN 201610723049 A CN201610723049 A CN 201610723049A CN 106253939 B CN106253939 B CN 106253939B
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- Prior art keywords
- signal
- time reversal
- antenna
- channel
- full duplex
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Classifications
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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
Co-channel full duplex electromagnetic communication method while the present invention discloses one kind based on time reversal, is related to microwave technical field.The respective Transmitting and Receiving End of communicating pair need to only be made the separation at sub-wavelength interval, can be achieved with effective inhibition of the Transmitting and Receiving End self-interference signal of same communication party by the present invention using the space-time focusing of time reversal electromagnetic wave, super-resolution focus characteristics.Simultaneously, due to utilizing time reversal technology, even if being spaced in sub-wavelength state between antenna element, its corresponding transceiver channel is still independent, therefore provided by the invention while co-channel full duplex communication means can effectively reduce communication module complexity, improve traffic rate, increase power system capacity.
Description
Technical field
The present invention relates to microwave technical field and the communications fields, and in particular to one kind is based on complete with frequency while time reversal
Duplexing electromagnetic communication method.
Background technology
The communication pattern of the wireless communication system generally use half-duplex (Half-duplex) of current main-stream, as the time-division is double
Work (Time-division duplexing, TDD) and frequency division duplex (Frequency-division duplexing, FDD).
Time division duplex uses time-multiplexed mode, in same channel, from the time that transmission channel and receiving channel is mutually isolated；
And frequency division duplex is then to assign transmission channel and receiving channel respectively using two different channels, and realize in time simultaneously
But the transmission-receiving function of different frequencies.It cannot achieve on the same channel with identical polarization side in view of traditional half duplex mode of communication
Formula receives and dispatches information simultaneously, thus radio spectrum resources are not yet made full use of.
The side of co-channel full duplex (Co-time co-frequency full duplexing, CCFD) full duplex simultaneously
Formula is realized and information is carried out while being received and dispatched on the same channel, it is thus possible to the availability of frequency spectrum be greatly improved, to improve communication
Rate increases power system capacity, improves communication efficiency.Also, co-channel full duplex communication simultaneously is anti-in data throughout, wireless access
The various aspects such as conflict ability, Electro Magnetic Compatibility, safety of physical layer have a clear superiority.However, to build efficient CCFD
Communication still suffers from numerous theoretical questions and technical bottleneck, and such as high performance self-interference is eliminated, full-duplex mode is in reality
Validity, low complex degree software/hardware full duplex system under application scenarios are built.Wherein, self-interference elimination is full duplex
The key problem of communication.It is existing studies have shown that under full-duplex communication pattern, if the intensity of self-interference signal can effectively press down
System makes the intensity of remaining self-interference signal be less than Background Noise Power 3dB or more, then the self-interference signal after inhibiting will not be to logical
The end-to-end handling capacity of letter system significantly affects.
Currently, in the research of CCFD communications, multiaerial system is mainly used, by the sky for reasonably arranging each antenna
Between position or the inhibition of self-interference is realized using the schemes such as cross polarization characteristics of electromagnetic wave.Document【Passive self-
interference suppression for full-duplex infrastructure nodes[J].IEEE
Transactions on Wireless Communications,2014,13(2):680-694.】It proposes a kind of using fixed
Inhibit the method that self-interference realizes CCFD to antenna method, the directional aerial of two secondary 90 degree of beam angles is used, in dual-mode antenna
It can realize that the self-interference of 27.9dB inhibits when at a distance of 50cm.Document【Two-way(true full-duplex)wireless[C]
.CWIT,Toronto,Canada,2013,33-38.】Using cross polarization principle, different polarization modes are used to sending and receiving both ends
Antenna realize transmitting-receiving between high-isolation, to inhibit the self-interference in CCFD communication process.As described above, current is main
Scheme is all made of multiple antennas i.e. aerial array, however according to traditional theory, to make multiaerial system obtain good space diversity
Gain and spatial multiplex gains, it is desirable that antenna element spacing is not less than half of operation wavelength, eventually leads to shared by receiving and transmitting front end
Space is larger, this minimizes this development trend with mobile terminal and disagrees.
Time reversal (Time reversal, TR) electromagnetism is electromagnetism new direction developed in recent years.Study table
It is bright, based on the symmetry of Maxwell equations, emit again after the time domain electromagnetic wave that receiver receives is carried out inverse time processing, electricity
Magnetic wave will show time-space synchronizing focus characteristic at former source point automatically.The Space Time focusing of TR electromagnetic waves, super-resolution
Focus characteristics would be possible to bring revolutionary change for wireless messages technology, in large capacity, high-rate wireless communication field, be
Intersymbol interference inhibition, co-channel interference inhibition, the MPI suppression in complex environment, intensive independent channel structure in the confined space
Completely new solution route is provided etc. a series of problems.Meanwhile using time reversal communication technology, even if between antenna element
It is interposed between sub-wavelength state, corresponding transceiver channel is still independent.If TR electromagnetic communications are introduced into CCFD communications,
It can inhibit to provide a kind of brand-new scheme for the self-interference of this kind of communication.
Invention content
To solve the relevant issues of the above-mentioned prior art, the present invention adopts the following technical scheme that：
One kind being based on co-channel full duplex electromagnetic communication method while time reversal, and principle topology is as shown in Figure 1, communication
Both sides are denoted as the ends A, the ends B respectively, include reception antenna (R per one endA、RB) and transmitting antenna (TA、TB), it specifically includes following
Step：
Step 1 is directed to the ends communication party A, in its reception antenna RAIt is upper to have encouraged and launched one for testing channel
Detectable signal HA(t), the transmitting antenna T at another party, that is, ends B is communicatedBDetectable signal H can be receivedA(t)；
Step 2, the ends B are to the detectable signal H that receivesA(t) time reversal operation is carried out, time reversal signal is obtained；
Step 3, at the ends B, needed the signal of the carrying information for being transmitted to the ends A to believe with the time reversal described in step 2
Number carry out convolution operation after obtain signal SB(t), via the transmitting antenna T at the ends BBBy signal SB(t) launch；Signal SB(t)
After space propagation, the reception antenna R at the ends A can be focused onAPlace is achieved in the information transmission at the ends B to the ends A；
Step 4, according to step 1 to step 3 the method, you can while realize the ends A to the ends B information transmission；
Due to the super-resolution focus characteristic of time reversal electromagnetic wave, the channel of each antenna in the ends B is independent, that is, emits day
Line TBThe signal S emittedB(t) the reception antenna R at the ends B will not theoretically be leaked toBOn；Similarly, the ends A transmitting antenna TAIt is sent out
The signal S penetratedA(t) the reception antenna R at the ends A will not theoretically be leaked toAOn, thus, it is possible to effectively inhibit same communication party from
Interference signal realizes co-channel full duplex communication simultaneously.
Further, it is the focusing effect of guarantee time reversal electromagnetic wave, the transmitting antenna T of communicating pairA、TBIt is packet
Array antenna containing no less than 3 antenna elements.
The beneficial effects of the invention are as follows：
The present invention is realized in co-channel full duplex communication simultaneously using the distinctive time-space focus characteristics of time reversal from dry
Disturb effective inhibition of signal；Simultaneously as using time reversal technology, even if communicating pair sending and receiving antenna element is spaced in
Sub-wavelength state, corresponding transceiver channel are still independent, therefore reduce communication module complexity, improve communication speed
Rate increases power system capacity, also provides guarantee for the miniaturization of mobile terminal.
Description of the drawings
Fig. 1 is provided by the invention while the principle topological diagram of co-channel full duplex electromagnetic communication method.
Fig. 2 is provided in an embodiment of the present invention while the principle topological diagram of co-channel full duplex electromagnetic communication method.
Specific implementation mode
Embodiment
Provided in this embodiment while co-channel full duplex communication means principle topology is as shown in Fig. 2, using following technology
Scheme：
One kind being based on co-channel full duplex electromagnetic communication method while time reversal, and communicating pair is denoted as the ends A, the ends B respectively,
Include reception antenna (R per one endA、RB) and transmitting antenna (TA、TB), the transmitting antenna TA、TBIt includes 3 antennas to be
Unit, in the array antenna of sub-wavelength layout pitch, specifically include following steps：
Step 1 is directed to the ends communication party A, in its reception antenna RAIt is upper to have encouraged and launched one for testing channel
Detectable signal HA(t), after space channel transmits, the transmitting antenna T at another party, that is, ends B is communicatedBDetection letter can be received
Number：
Wherein hn(t) it is channel impulse response,For convolution operation；
Step 2, the ends B are to the detectable signal X that receivesA(t) time reversal operation is carried out, time reversal signal is obtained：
Step 3, at the ends B, needed the signal i (t) for the carrying information for being transmitted to the ends A and the time described in step 2 anti-
Drill signal XA(- t) obtains signal after carrying out convolution operationVia the transmitting antenna T at the ends BBBy signal SB
(t) launch；Signal SB(t) after space channel transmits, the reception antenna R at the ends A can be focused onAPlace, is achieved in the ends B
Information to the ends A is transmitted；
Step 4, according to step 1 to step 3 the method, you can while realize the ends A to the ends B information transmission；
Due to the super-resolution focus characteristic of time reversal electromagnetic wave, the channel of each antenna in the ends B is independent, that is, emits day
Line TBThe signal S emittedB(t) the reception antenna R at the ends B will not theoretically be leaked toBOn；Similarly, the ends A transmitting antenna is emitted
Signal SA(t) the reception antenna R at the ends A will not theoretically be leaked toAOn, thus, it is possible to effectively inhibit doing certainly for same communication party
Signal is disturbed, realizes co-channel full duplex communication simultaneously.
Claims (2)
1. one kind being based on co-channel full duplex electromagnetic communication method while time reversal, communicating pair is denoted as the ends A, the ends B respectively, often
One end includes reception antenna (RA、RB) and transmitting antenna (TA、TB), specifically include following steps：
Step 1 is directed to the ends communication party A, in its reception antenna RAIt is upper to have encouraged and launched a detection letter for testing channel
Number HA(t), the transmitting antenna T at another party, that is, ends B is communicatedBDetectable signal H can be receivedA(t)；
Step 2, the ends B are to the detectable signal H that receivesA(t) time reversal operation is carried out, time reversal signal is obtained；
Step 3, at the ends B, needed the signal of the carrying information for being transmitted to the ends A and the time reversal signal described in step 2 into
Signal S is obtained after row convolution operationB(t), via the transmitting antenna T at the ends BBBy signal SB(t) launch；Signal SB(t) pass through
After space propagation, the reception antenna R at the ends A can be focused onAPlace is achieved in the information transmission at the ends B to the ends A；
Step 4, according to step 1 to step 3 the method, you can while realize the ends A to the ends B information transmission；
Due to the super-resolution focus characteristic of time reversal electromagnetic wave, the channel of each antenna in the ends B is independent, i.e. transmitting antenna TB
The signal S emittedB(t) the reception antenna R at the ends B will not theoretically be leaked toBOn；Similarly, the letter that the ends A transmitting antenna is emitted
Number SA(t) the reception antenna R at the ends A will not theoretically be leaked toAOn, thus, it is possible to effectively inhibit the self-interference of same communication party to believe
Number, realize co-channel full duplex communication simultaneously.
2. according to claim 1 be based on co-channel full duplex electromagnetic communication method while time reversal, which is characterized in that
The transmitting antenna T of communicating pairA、TBIt is comprising no less than 3 antenna elements, in the array antenna of sub-wavelength layout pitch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610723049.9A CN106253939B (en) | 2016-08-25 | 2016-08-25 | One kind being based on co-channel full duplex electromagnetic communication method while time reversal |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610723049.9A CN106253939B (en) | 2016-08-25 | 2016-08-25 | One kind being based on co-channel full duplex electromagnetic communication method while time reversal |
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| Publication Number | Publication Date |
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| CN106253939A CN106253939A (en) | 2016-12-21 |
| CN106253939B true CN106253939B (en) | 2018-10-16 |
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| CN201610723049.9A Expired - Fee Related CN106253939B (en) | 2016-08-25 | 2016-08-25 | One kind being based on co-channel full duplex electromagnetic communication method while time reversal |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116318240A (en) | 2019-04-25 | 2023-06-23 | 华为技术有限公司 | Full duplex self-interference elimination method and device |
| CN110212940B (en) * | 2019-05-13 | 2021-03-30 | 电子科技大学 | Antenna system for simultaneous same-frequency full duplex communication |
| 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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| CN102332937B (en) * | 2011-09-23 | 2013-12-11 | 电子科技大学 | OPPM-UWB (overlapping pulse position modulation-ultra wide band) communication method on basis of time reversal technology |
| CN104052529B (en) * | 2013-03-14 | 2018-07-17 | 上海诺基亚贝尔股份有限公司 | A kind of aerial array and a kind of communication means for full-duplex communication |
| CN103414542A (en) * | 2013-08-20 | 2013-11-27 | 清华大学 | Method and device for transferring synchronous same-frequency full duplex node data in wireless communication system |
| BR112016012162B1 (en) * | 2013-11-29 | 2022-09-27 | Huawei Technologies Co., Ltd | METHOD TO REDUCE SELF-INTERFERENCE SIGNAL IN COMMUNICATIONS SYSTEM, AND DEVICE |
| CN104777519B (en) * | 2015-04-21 | 2017-06-09 | 电子科技大学 | A kind of method and system of electromagnetic signal time inversion |
| CN105071906B (en) * | 2015-07-09 | 2018-06-15 | 清华大学 | Method and node with frequency full-duplex communication simultaneously are realized in wlan system |
| 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 |
| CN105099643B (en) * | 2015-08-18 | 2019-03-01 | 北京科技大学 | A kind of method of Full-duplex wireless communications, antenna assembly and system |
| CN105634541B (en) * | 2015-12-29 | 2018-11-27 | 北京邮电大学 | Full duplex is taken can communication means and node |
| CN105681323B (en) * | 2016-02-25 | 2019-04-09 | 电子科技大学 | A kind of Information hiding formula radio transmitting method based on time reversal |
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