CN106099391A - The receiving/transmission method of information in co-channel full duplex communication while of a kind of - Google Patents
The receiving/transmission method of information in co-channel full duplex communication while of a kind of Download PDFInfo
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- CN106099391A CN106099391A CN201610381949.XA CN201610381949A CN106099391A CN 106099391 A CN106099391 A CN 106099391A CN 201610381949 A CN201610381949 A CN 201610381949A CN 106099391 A CN106099391 A CN 106099391A
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q21/00—Antenna arrays or systems
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q25/00—Antennas or antenna systems providing at least two radiating patterns
- H01Q25/04—Multimode antennas
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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
- 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
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Abstract
The receiving/transmission method of information in co-channel full duplex communication while that the present invention disclosing a kind of, to the vortex electromagnetic wave structure producing n (n>1) kind OAM pattern, utilize the characteristic that OAM pattern is orthogonal, any k (0<k<n) of n kind OAM pattern is planted the pattern transmission for information, residue n k kind OAM pattern is for the reception of information, need not extra self-interference removing measure, can be achieved with identical frequency band and send simultaneously and receive that multichannel is independent of one another and non-interfering signal, and then realize co-channel full duplex communication while High rate and large capacity, the problems such as effective solution existing wireless communications frequency spectrum resource anxiety is limited with traffic rate, resolving ideas is provided for Modern High-Speed rate Large Copacity radio communication.
Description
Technical field
The invention belongs to wireless communication technology field, the transmitting-receiving of information in co-channel full duplex communication while of being specifically related to a kind of
Method.
Background technology
Along with the high speed development of mobile communication technology, wireless communication rate gets a promotion the most therewith, and how to improve frequency spectrum
Utilization rate becomes focus of concern.For making full use of limited frequency spectrum resource, improve the availability of frequency spectrum, simultaneously complete double with frequency
Work (Co-time Co-frequency Full Duplex, CCFD) technology is arisen at the historic moment.Traditional dual-mode predominantly frequency
Point duplex (Frequency Division Duplexing, FDD) and time division duplex (Time Division Duplexing,
TDD), in order to avoid the interference over the frequency domain of the small-signal to receiving of big signal when launching.For reducing traditional double
Work pattern medium frequency or the expense of time interval resource, in emerging CCFD communication, transmitter and receiver takies identical frequency spectrum
Resource also works simultaneously so that communicating pair carries out multiple wireless in the carrier frequency that uplink and downlink communication link utilization is identical simultaneously
The transmitting of signal and reception, thus the availability of frequency spectrum is multiplied, significantly improve the traffic rate of system.
But, CCFD communication technology still suffers from great challenge.For any communication system, launch signal intensity the most remote
More than received signal strength.If receiving and transmitting signal is operated in identical carrier frequency and receives and dispatches simultaneously, will cause receiving signal
Fall into oblivion completely in launching in the interference caused by signal, so that receiver cannot be from receiving the letter recognized the need for signal
Breath.Therefore, the effective elimination that it is critical only that self-interference of CCFD communication system.
So far, through the further investigation of people, achieved with corresponding achievement.Stanford University Choi et al. uses antenna pair
Disappear and offset transmitting-receiving and the elimination of noise signal achieving homogenous frequency signal simultaneously with balun, document [Choi J I, Jain M,
Srinivasan K,et al.Achieving single channel,full duplex wireless
communication[C]//Proceedings of the 16th annual international conference on
Mobile computing and networking.ACM, 2010:1-12.] and [Jain M, Choi J I, Kim T, et
al.Practical,real-time,full duplex wireless[C]//Proceedings of the 17th
annual international conference on mobile computing and networking.ACM,2011:
301-312.] etc. reported；Rice University Sabharwal et al. announces achievement in research [Duarte M, Sabharwal
A.Full-duplex wireless communications using off-the-shelf radios:Feasibility
and first results[C]//IEEE Conference record of the 44th asilomar conference
On signals, systems and computers (ASILOMAR), 2010:1558-1562.] and [Sahai A, Patel
G,Sabharwal A.Pushing the limits of full-duplex:Design and real-time
Implementation [J] .arXiv preprint arXiv:1107.0607,2011.], by constructing at reception antenna
Additional radio frequency link and change dual-mode antenna come to interference canceled signal relative to position, thus improve the isolation between transmitting-receiving；This
Outward, New York University Knox et al. is at document [Knox M E.Single antenna full duplex communications
using a common carrier[C]//IEEE 13th annual wireless and microwave technology
Conference (WAMICON), 2012:1-6.] the middle one single antenna transmitting-receiving scheme that proposes, annular by directional coupler elimination
Device leakage and the impact of antenna-reflected, thus realize preferable transceiver insulation.But, above-mentioned all embodiments are the most complicated,
Need to be solved the self-interference problem of system by additional measures.
Medium owing to being wirelessly transferred is electromagnetic wave, if find available electromagnetic wave new physics mechanism and for
CCFD, then bring change can to the most whole radio communication of CCFD communication system.Electricity is understood by Maxwell's classical electromagnetic theory
Magnetic radiation can be loaded with energy and momentum simultaneously, and momentum includes linear momentum and angular momentum.Angular momentum is divided into spin angular momentaum
(Spin Angular Momentum, SAM) and orbital angular momentum (Orbital Angular Momentum, OAM).As electricity
One basic physical attribute of magnetic wave, the eigenstate of OAM has shape such asPhase factor, l is the pattern of OAM, is also called
Topological charge (Topological Charge, TC), represents the spatial distribution of OAM.Common electromagnetic wave OAM pattern is 0, equiphase
Face is plane；If wave beam is twisted, the OAM pattern of electromagnetic wave is not 0, the biography that wavefront spirally state will be caused to rotate on ripple
Broadcasting direction, and the field intensity at wavefront center is zero, this extraordinary electromagnetic wave with helical form phase front is exactly vortex electromagnetic wave.
Vortex electromagnetic wave, as a kind of new mechanism, has high-efficiency frequency spectrum utilization rate and the noticeable characteristic such as anti-interference.
Have research worker at present and the OAM of vortex electromagnetic wave is considered as a new degree of freedom and as data message carrier, carry out profit
Rationale and the key technology research of radio communication is carried out with vortex electromagnetic wave.Tamburini et al. delivers research in 2012
Achievement [Tamburini F, Mari E, Sponselli A, et al.Encoding many channels on the same
frequency through radio vorticity:first experimental test.New Journal of
Physics, 2012,14 (3): 033001], by experimental verification, vortex electromagnetic wave is applied to the feasibility of radio communication.
For the vortex electromagnetic wave of optional frequency, the most desirable infinite multi-mode of OAM, then by vortex electromagnetic wave
Different OAM patterns carry out same format coding, can realize identical frequency band and transmit that multichannel is independent of one another and non-interfering letter simultaneously
Number.Further, the vortex electromagnetic wave of some of which OAM pattern is used for the transmission of information and pattern of surplus is used for the reception of information
And in CCFD communication system, due to the orthogonal property of OAM pattern, can effectively solve CCFD system self-interference problem, from
And realize the wireless communication of High rate and large capacity.Thus, CCFD based on vortex electromagnetic wave communication has at same frequency
Rate carries out receiving and sending messages and carrying the potentiality of unlimited multiple data quantity simultaneously, and the utilization rate of wireless frequency spectrum and communicate speed can be substantially improved
Rate, has great development prospect.
CCFD based on vortex electromagnetic wave communicates, it is necessary first to produce this electromagnetic wave with helical phase wavefront, by
Having hollow nature in this electromagnetic wave, show as tapering wave beam, this wave beam dissipates in communication process, tapered expansion
Bulk.The radiation characteristic of this divergent shape, will directly affect the transmission range of information, thus propose transmitter power higher
Requirement, and higher transmitting power also brings bigger interference to reception, this brings greatly to the transmitting-receiving design of CCFD communication system
Challenge.
Summary of the invention
The while of it is an object of the invention to provide a kind of, the receiving/transmission method of information in co-channel full duplex communication, solves CCFD and leads to
Communication system self-interference problem.The present invention can realize CCFD communication without extra interference cancellation techniques, can effectively solve existing
Wireless communication spectrum scarcity of resources and the limited problem of traffic rate.
For achieving the above object, the technical solution used in the present invention is as follows:
The while of a kind of, the receiving/transmission method of information in co-channel full duplex communication, utilizes vortex electromagnetic wave difference OAM pattern each other
Orthogonal characteristic, produces n (n > 1) for one and plants the vortex electromagnetic wave structure that operating frequency is identical, OAM pattern is different, by it
In arbitrarily k (0 < k < n) plant the transmission for information of the OAM pattern, residue n-k kind OAM pattern, for the reception of information, can realize
Same frequency sends simultaneously and receives that multichannel is independent of one another and non-interfering signal, it is achieved the elimination of self-interference is also carried out at a high speed
Co-channel full duplex communication while that rate being jumbo.
Further, the vortex electromagnetic wave structure of described generation n kind difference OAM pattern can be real by following method for designing
Existing:
Step A-1. is for needing to generate the vortex electromagnetic wave that OAM pattern is l, and building an array element sum is the plane of m
Array antenna, wherein array number m should meet | l | < m/2；Described m array element is arranged for non-rectilinear on front and constitutes an envelope
Closed curve, chooses wherein any one array element numbered 1, with No. 1 array element for starting point along described closed curve clockwise or
Counterclockwise will remain that array element is numbered 2 successively, 3 ..., m；
The excitation phase of all array element of step A-2. with the numbered sequence of array element be arithmetic progression arrangement, described arithmetic progression with
The excitation phase α of No. 1 array element1It is 2 π l/m or-2 π l/m for first term, phase place tolerance of going forward one by one；
Step A-3. applies constant amplitude to all array elements, phase place meets the excitation set described in step A-2, can produce OAM
Pattern is the vortex electromagnetic wave of l；
Step A-4., according to method described in step A-1 to A-3, builds that described n kind operating frequency is identical, OAM pattern different
N planar array antenna corresponding to vortex electromagnetic wave, described n planar array antenna is arranged on same front, i.e.
Constitute described vortex electromagnetic wave structure.
The array element of single planar array antenna can be arranged in triangle or concentric circumferences or on oval week, and front shape is i.e.
Described closed curve can be triangle, rectangle, circle, ellipse or other polygons；The array element form of described array antenna
Do not limit, can be micro-strip paster antenna, such as rectangle or Circular microstrip patch antenna, it is also possible to be monopole antenna or dipole
Sub antenna etc..
Further, by the array element maximum spacing d in single planar array antennamaxLimit, i.e. meet dmax
≤ λ, wherein λ is the waveguide wavelength that described array antenna operating frequency is corresponding, and this planar array antenna can be avoided too high grid occur
Lobe.
By adjusting the array element sum m of single planar array antenna or changing the arrangement mode of this array elements and can strengthen this
The vortex effect of the vortex electromagnetic wave that planar array antenna produces.
Further, for reducing the size of described vortex electromagnetic wave structure, described n planar array antenna can be arranged successively
Being distributed on n concentrically ringed circumference and form multilamellar circle battle array, each layer of circle is corresponding to producing the planar array sky of a kind of OAM pattern
Line, as shown in Figure 1；The radius R of multilamellar circle battle arrayn(n=1,2,3 ...) increase successively, i.e. Rn>Rn-1>…R2>R1>0；For described
The n-th layer of multilamellar circle battle array, array element sum is Nn, according to method described in step A-1 to A-4, by regulation array element sum NnWith array element
Between excitation phase contrast 2 π ln/NnThe pattern of generation is lnVortex electromagnetic wave, forming OAM pattern is lnVortex electromagnetic wave.
On the basis of the above, further by controlling the excitation phase α of every layer of No. 1 array element1, the main ripple of circle battle array radiation can be made
Bundle is positioned at assigned direction, and directionality is high, thus effectively overcomes the radiation characteristic that the tapered shape of main beam dissipates, it is achieved remote
Transmission.And mutually orthogonal between OAM pattern, strong interference immunity, multiple patterns can independently carry multiple information, when these patterns
When the transmitting-receiving work of radio communication, co-channel full duplex communication while of can carrying out high performance.
The invention has the beneficial effects as follows:
Based on characteristic orthogonal between vortex electromagnetic wave difference OAM pattern, co-channel full duplex communication simultaneously is proposed new
Implementation method.The vortex electromagnetic wave structure being wherein used for producing n kind OAM pattern is multi-layer circular antenna array, each by controlling
The excitation phase difference of layer array element produces the vortex electromagnetic wave of different OAM pattern.Additionally, by controlling at the beginning of each layer the first array element
Beginning excitation phase solves radiation divergence problem, thus realizes long-distance transmissions.The present invention can effectively eliminate without additional measures
The self-interference of system, it is achieved co-channel full duplex communication while of high performance, effectively solve wireless communication spectrum scarcity of resources and
The problem that traffic rate is limited.
Accompanying drawing explanation
Fig. 1 is a kind of vortex electromagnetic wave structure figure for producing n kind OAM pattern under same frequency.
The double-layer circular antenna array schematic diagram that Fig. 2 provides for the embodiment of the present invention.
The array element model that Fig. 3 provides for the embodiment of the present invention.
Fig. 4 is the reflection coefficient curve of array element in the embodiment of the present invention.
Fig. 5 is the PHASE DISTRIBUTION figure of array element electric field in the embodiment of the present invention.
Fig. 6 is the far-field pattern of array element in the embodiment of the present invention.
The double-layer circular antenna array model that Fig. 7 provides for the embodiment of the present invention.
Fig. 8 is electric field phase scattergram during embodiment of the present invention double-layer circular antenna array only inner operative.
Fig. 9 is far-field pattern during embodiment of the present invention double-layer circular antenna array only inner operative.
Figure 10 is electric field phase scattergram during embodiment of the present invention double-layer circular antenna array only outer operative.
Figure 11 is far-field pattern during embodiment of the present invention double-layer circular antenna array only outer operative.
Figure 12 is embodiment of the present invention double-layer circular antenna array ectonexine electric field phase scattergram when simultaneously working.
Figure 13 is embodiment of the present invention double-layer circular antenna array ectonexine far-field pattern when simultaneously working.
Detailed description of the invention
Below in conjunction with specific embodiment and accompanying drawing, the invention will be further described.
1, the generation of vortex electromagnetic wave
It is the array antenna (non-linear array) of N to array element sum, each array element is applied constant amplitude, adjacent array element phase contrast
Certain excitation, just can produce the vortex electromagnetic wave of different OAM pattern.If the excitation phase of first array element is α1, by control
Make the excitation phase of other array element so that it is phase place increasing or decreasing successively (can also be that phase place is successively along clockwise or counterclockwise
Direction changes) 2 π l/N, l are topological charge, i.e. kth (k=1,2 ..., n) the excitation phase α of individual array elementkFor α1± 2 π lk/N, then battle arrays
Unit's sum just can produce, for the array antenna of N, the vortex electromagnetic wave that OAM pattern is l or-l, wherein array element sum N with realized
Topological charge l meet relation | l | < N/2.
The vortex of the n kind OAM pattern that produces under same frequency that Fig. 1 is provided based on above-mentioned theory by the embodiment of the present invention
Electromagnetic wave structure figure, is evenly arranged on the circumference of donut by multiple array elements, forms multilamellar circle battle array.By every layer of battle array of regulation
Unit's sum and the excitation phase of array element, produces one OAM pattern, so, and just can be same frequency while by multilamellar circle battle array
Produce multiple vortex electromagnetic wave with different OAM pattern.
Fig. 2 is the schematic diagram of the embodiment of the present invention, illustrates, inside and outside two-layer array element sum N as a example by two-layer i.e. n=21And N2
Being respectively 6 and 8, array element is evenly arranged on concentric ring, constitutes double-layer circular battle array, is 1 He in order to produce OMA pattern under same frequency
The vortex electromagnetic wave of 2.Embodiment selects the rectangular microband paste antenna that section is low, volume is little, easily fabricated, as shown in Figure 3.Work
Working frequency f is 2.5GHz, including rectangular patch 2, dielectric-slab 3 and floor 4 three part, wherein, thickness be the dielectric-slab 3 of h be square
Shape substrate, its front is metal rectangular paster 2, and the back side is the metal floor 4 of size equal with dielectric-slab, the front of dielectric-slab 3
Being positioned at xoy plane, center is zero.Width and the length of described dielectric-slab 3 are respectively W1And L1, the width of rectangular patch 2
Being respectively W and L with length, feed point 1 is positioned in x-axis, off-center L0, use coaxial feed mode, the outer conductor of coaxial line with
Metal ground 4 connects, and inner wire directly connects with rectangular patch 2.
Described dielectric-slab 3 uses FR4 medium substrate, relative dielectric constant εrBeing 4.4, thickness h is 1.6mm, W1And L1Along spoke
Penetrate stretch out half wavelength, the size of rectangular patch 2 and the position of feed point 1 of Yuan Gebian to be estimated by below equation:
In formula,
Calculate relative dimensions according to above-mentioned formula, use the coaxial feeding of 50 Ω, by CST software, parameter is carried out
Optimize, finally determine that W and L is respectively 36.5mm and 26.85mm, L0For 4.4mm, the reflection coefficient S of array element11As shown in Figure 4,
Can be seen that resonant frequency is 2.5GHz, and this frequency return loss be about 26dB, Fig. 5 be the PHASE DISTRIBUTION of array element electric field
Figure, array element far-field pattern is as shown in Figure 6.
After determining the parameter of single array element, it is rotated along z-axis and is evenly arranged on the concentric ring in xoy face, constitute bilayer
Circle battle array, its model is as shown in Figure 7.The impact on graing lobe in view of antenna size and array element distance, takes ectonexine radius R1And R2Point
Be not 0.5 λ and 0.8 λ (λ is the free space wavelength that resonant frequency is corresponding), i.e. 60mm and 96mm, dielectric-slab is along each limit of radiation element
Stretch out half wavelength.Ectonexine array element sum N1And N2It is respectively 6 and 8, by controlling the excitation phase of every layer of each array element
Produce OAM pattern l under same frequency1And l2It is respectively the vortex electromagnetic wave of 1 and 2.
If the excitation phase of first array element of ectonexine is respectively α1And α2, increase by 2 π l successively by controlling internal layer phase place1/
N1=60 °, outer layer phase place increases by 2 π l successively2/N2=90 ° i.e. produce the vortex electromagnetic wave that OAM pattern is 1 and 2.Further, logical
Cross change initial phase α1And α2Controlling greatest irradiation direction, make main lobe the strongest along a direction, secondary lobe is less simultaneously, orientation
Property is higher.Considering, the present embodiment selects α1And α2It is respectively 0 ° and-15 °.Fig. 8 is electric field during embodiment only inner operative
PHASE DISTRIBUTION figure, it is seen that electric field phase circumferentially circle change 2 π, corresponding to creating the vortex electromagnetic wave that OAM pattern is 1, its
Corresponding far-field pattern is as shown in Figure 9；Figure 10 is electric field phase scattergram during embodiment only outer operative, in like manner understands electricity
Field phase circumferentially circle change 4 π, corresponding to creating the vortex electromagnetic wave that OAM pattern is 2, corresponding far-field pattern is such as
Shown in Figure 11；Figure 12 is embodiment ectonexine electric field phase scattergram when simultaneously working, corresponding to the whirlpool that OAM pattern is 1 and 2
Rotation electromagnetic wave, Figure 13 is corresponding far-field pattern, in θ=32 °,Direction has maximum radiant intensity.
2, CCFD Realization Method of Communication based on vortex electromagnetic wave
To the above-mentioned vortex electromagnetic wave structure producing two kinds of OAM patterns under same frequency, its OAM pattern is 1 and 2, main
Wave beam is positioned at a certain assigned direction, and directionality is high, can realize long-distance transmissions.In CCFD system, can be by OAM pattern 1 (or mould
Formula 2) for the transmission of information, and OAM pattern 2 (or pattern 1) is for the reception of information, and work is on a same frequency, due to
Between OAM pattern orthogonal, information separate does not interfere with each other during transmitting, it is achieved while information same frequency sending and
Receive.So, CCFD based on vortex electromagnetic wave communicates, it is not necessary to extra self-interference removing measure, can be achieved with identical frequency band
Send simultaneously and receive that multichannel is independent of one another and non-interfering signal, it is achieved High rate and large capacity remote information transmission.
Said structure is only one embodiment of the present of invention, and it is complete based on frequency same while vortex electromagnetic wave that the present invention proposes
Duplex communication method, utilizes the characteristic that vortex electromagnetic wave OAM pattern is orthogonal, to any realize under same frequency multiple
The vortex electromagnetic wave structure of OAM pattern, selects some of which OAM pattern for the transmission of information, and pattern of surplus is for information
Receive, all can realize the independence transmitting-receiving of multiline message, it is not necessary to extra self-interference removing measure can realize simultaneously complete with frequency simultaneously
Information transmit-receive in duplex communication.
Claims (7)
1. a receiving/transmission method for information in co-channel full duplex communication simultaneously, utilizes vortex electromagnetic wave difference orbital angular momentum pattern
The characteristic that i.e. OAM pattern is orthogonal, produces, for one, the vortex electromagnetic wave knot that n kind operating frequency is identical, OAM pattern is different
Structure, is used for the transmission of information by wherein arbitrarily k kind OAM pattern, and residue n-k kind OAM pattern, for the reception of information, can realize
Same frequency sends simultaneously and receives that multichannel is independent of one another and non-interfering signal.
The receiving/transmission method of information in co-channel full duplex communication while the most according to claim 1, described generation n kind is different
The vortex electromagnetic wave structure of OAM pattern can be realized by following method for designing:
Step A-1. is for needing to generate the vortex electromagnetic wave that OAM pattern is l, and building an array element sum is the planar array of m
Antenna, wherein array number m should meet | l | < m/2；Described m array element is arranged for non-rectilinear on front and is constituted one and closes song
Line, chooses wherein any one array element numbered 1, with No. 1 array element for starting point along the clockwise of described closed curve or inverse time
Pin direction will remain that array element is numbered 2 successively, 3 ..., m；
The excitation phase of all array element of step A-2. is arithmetic progression arrangement with the numbered sequence of array element, and described arithmetic progression is with No. 1
The excitation phase α of array element1It is 2 π l/m or-2 π l/m for first term, phase place tolerance of going forward one by one；
Step A-3. applies constant amplitude to all array elements, phase place meets the excitation set described in step A-2, can produce OAM pattern
Vortex electromagnetic wave for l；
Step A-4., according to method described in step A-1 to A-3, builds the whirlpool that described n kind operating frequency is identical, OAM pattern is different
Rotation n planar array antenna corresponding to electromagnetic wave, is arranged in described n planar array antenna on same front, i.e. constitutes
Described vortex electromagnetic wave structure.
The receiving/transmission method of information in co-channel full duplex communication while the most according to claim 2, it is characterised in that described envelope
Closed curve is circular, oval or polygon.
The receiving/transmission method of information in co-channel full duplex communication while the most according to claim 3, it is characterised in that described battle array
Unit is micro-strip paster antenna, monopole antenna or dipole antenna.
5. according to the receiving/transmission method of information in co-channel full duplex communication while described in claim 2,3 or 4, it is characterised in that
Array element maximum spacing d in single planar array antennamaxMeet dmax≤ λ, wherein λ is that described array antenna operating frequency is corresponding
Waveguide wavelength.
The receiving/transmission method of information in co-channel full duplex communication while the most according to claim 2, it is characterised in that described n
Individual planar array antenna is arranged in successively on n concentrically ringed circumference and forms multilamellar circle battle array, and each layer of circle is corresponding to producing one
The planar array antenna of OAM pattern.
The receiving/transmission method of information in co-channel full duplex communication while the most according to claim 6, it is characterised in that by adjusting
Save the excitation phase α of every layer of round No. 1 array element of battle array1, the radiation main beam direction of this layer of circle battle array of scalable.
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| CN110212940A (en) * | 2019-05-13 | 2019-09-06 | 电子科技大学 | A kind of antenna system for co-channel full duplex communication simultaneously |
| CN110299609A (en) * | 2019-05-24 | 2019-10-01 | 合肥工业大学 | A kind of nested both arms flat helical antenna realizing more OAM modes and generating |
| CN110426707A (en) * | 2019-08-12 | 2019-11-08 | 中国人民解放军国防科技大学 | Vortex SAR imaging method and system based on orbital angular momentum |
| WO2021147613A1 (en) * | 2020-01-23 | 2021-07-29 | 华为技术有限公司 | Full-duplex communication method and apparatus |
| US20210344117A1 (en) * | 2017-12-21 | 2021-11-04 | Nxgen Partners Ip, Llc | Full duplex using oam |
| WO2021244532A1 (en) * | 2020-06-03 | 2021-12-09 | 华为技术有限公司 | Communication method and related apparatus |
| CN114024135A (en) * | 2021-10-29 | 2022-02-08 | 上海交通大学 | Multi-mode traveling wave loaded substrate integrated waveguide vortex electromagnetic wave antenna |
| CN114124133A (en) * | 2021-11-19 | 2022-03-01 | 重庆大学 | Double-helix information transmission structure and method based on P-B phase |
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