CN105376184B - A kind of two-dimensional antenna of narrowband full duplex system offsets method - Google Patents
A kind of two-dimensional antenna of narrowband full duplex system offsets method Download PDFInfo
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- CN105376184B CN105376184B CN201510711024.2A CN201510711024A CN105376184B CN 105376184 B CN105376184 B CN 105376184B CN 201510711024 A CN201510711024 A CN 201510711024A CN 105376184 B CN105376184 B CN 105376184B
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- 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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03343—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/0404—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas the mobile station comprising multiple antennas, e.g. to provide uplink diversity
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- 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
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03821—Inter-carrier interference cancellation [ICI]
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Abstract
本发明公开一种窄带全双工系统的二维天线对消方法。其基于相位抵消原理的自干扰消除上增设N对发射天线，在窄带全双工系统中，在近端全双工节点处由N副发射天线和一副接收天线构成一个圆形的天线布阵结构，接收天线在圆心处，发射天线分布在两个以接收天线为圆心的同心圆上，且两两在一条直径成对分布，每一对中，其中之一距离圆心的距离为d，另一个距离圆心的距离是d+λ/2，达到一条路径长度与另一条相比相差信号载波波长一半的奇数倍，即使得相位相差π，满足相互对消的原理，发送信号从发射天线处经功分器分为N份，同时同频发送出去，在接收天线处使自干扰信号相消叠加，明显减少对接收端有用信号的干扰。
The invention discloses a two-dimensional antenna cancellation method for a narrow-band full-duplex system. N pairs of transmitting antennas are added to the self-interference elimination based on the principle of phase cancellation. In the narrow-band full-duplex system, a circular antenna array is formed by N pairs of transmitting antennas and one pair of receiving antennas at the near-end full-duplex node. The structure, the receiving antenna is at the center of the circle, and the transmitting antenna is distributed on two concentric circles with the receiving antenna as the center, and the two are distributed in pairs on a diameter. In each pair, one of them is d away from the center of the circle, and the other The distance from one to the center of the circle is d+λ/2, and the length of one path is an odd multiple of half the wavelength of the signal carrier compared to the other, that is, the phase difference is π, which satisfies the principle of mutual cancellation. The power divider is divided into N parts, which are sent out at the same frequency at the same time, and the self-interference signal is canceled and superimposed at the receiving antenna, which significantly reduces the interference to the useful signal at the receiving end.
Description
Technical field
The invention belongs to fields of communication technology more particularly to a kind of two-dimensional antenna of narrowband full duplex system to offset method.
Background technique
Today wireless device using more and more common.Growing wireless multimedia services demand and limited wireless
Frequency spectrum resource and users' demand higher and higher to wireless network speed and reliability practicability, so that people are increasingly
It is absorbed in and develops higher transfer rate and more cost-effective Radio Network System.How the utilization of limited spectrum resources is improved
Rate is the main goal in research of present wireless communication system, in the past few decades in, researchers put forth effort on research save nothing
Line resource or the various technology and methods for maximally utilizing radio resource, various wireless communication systems come into being.But
How duplexing field enhancing the availability of frequency spectrum technology still up for raising.
In radio systems, a most basic concept be wireless telecom equipment cannot identical frequency band and meanwhile send with
Data are received, that is, work in single channel full-duplex mode.This is because having two antennas in each node, an antenna is used for
Signal is sent, an antenna is for receiving signal, and when system works in co-channel full duplex mode, receiving antenna signal be will receive
Oneself transmitting antenna sends the interference of signal, since wireless signal can decline rapidly in transmission process with the increase of distance
Subtract, then wanted received distant object signal that will be submerged in the transmission signal of this transmitting antenna completely (referred to as from dry originally
Disturb signal) it is inner.General intercommunication system, two nodes send and receive signal simultaneously in identical frequency band, such as 1 institute of attached drawing
Show, the signal of the transmitting antenna TX1 transmitting of node 1 can generate interference at node receiving antenna RX1, this signal ratio comes from
High 15-the 100dB of echo signal of 2 transmitting antenna TX2 of node.Since most of Modern Communication System is all that digitized processing connects
The collection of letters number carrys out decoded signal, this is just needed using analog-digital converter (Analog-to-Digital Converter, abbreviation ADC)
Digital signal is converted by radio frequency receiving signal.But in this case, high reject signal will occupy reception signal processing chain
Most of dynamic range of ADC in road, so that the quantizing noise of useful signal is too big, useful signal is submerged in quantizing noise,
Information is lost.It can be seen that the huge challenge that design single channel full-duplex wireless communication systems are faced is how to believe in radio frequency reception
Number by eliminating as much as the strong self-interference signal of receiver before ADC sampling.
In September, 2010, Stanford Univ USA Sachin Katti et al. are demonstrated on international conference MobiCom ' 10
The experimental result that they provide in paper, it is indicated that can be using antenna technology for eliminating combination self-interference technology for eliminating
802.15.4 the 2.4GHz frequency range of personal area network realizes single channel Full-duplex wireless communications, which can make proximal end interference attenuation up to
60dB.It includes that radio frequency interference elimination and digital interference eliminate two kinds of self-interference technology for eliminating that wherein interference, which is eliminated,.Later research
Placement location for the distance between dual-mode antenna, the direction of dual-mode antenna and antenna etc. has carried out the property that antenna offsets
The raising of energy.
According to existing full-duplex antenna cancellation techniques, it is assumed that the baseband signal of emission source is x [t], by two transmitting days
After line, its amplitude is caused to be scaled A respectively1And A2, before reaching receiving antenna, two groups of signals produce respectively
WithDecaying andWithPhase shift, then the superposed signal that final receiving antenna receives are as follows:
The signal power received are as follows:
For theoretically, it should haveBut in fact, to guarantee the identical width of two groups of signals at receiving antenna
Spend it is highly difficult because two groups of signals, which reach receiving antenna by different path, can inevitably generate distortion or distortion.If two groups
The phase difference for emitting signal is ideal situation, and there will be φ2=φ1+ π, but since we are directed to narrow band signal, transmitting letter
Number it is not single-frequency, but has certain bandwidth, and be real system again, so still there is amplitude and phase error.This
The error of a little matched errors of amplitude and phase matched will impact the performance of antenna cancellation techniques, make under its effect
Drop.
It is understood that whether matching in amplitude matches or phase matched, that is, distance, the error of very little will be generated very
Big influence, so that cancellation techniques performance declines.Synchronous signal is in the transmission process from transmitting antenna to receiving antenna, and experience is not
The same characteristic of channel, can also seriously affect the amplitude and phase of signal, the relative amplitude of offseting signal and phase is caused to change
Become, so that the performance of antenna cancellation techniques be caused to decline.
Summary of the invention
For the deficiency for the antenna cancellation techniques deposited, the purpose of the present invention is to provide one kind can significantly reduce docking
The two-dimensional antenna of the narrowband full duplex system of the interference of receiving end useful signal offsets method.The two-dimentional day of the narrowband full duplex system
It is in a node setting N on two-dimensional space to transmission antenna that line, which offsets method, and each pair of transmission antenna is believed apart from upper difference
The odd-multiple of number carrier wavelength half, so that self-interference signal cancellation at receiving antenna is superimposed, to make two transmission antennas
The signal sent obtains certain elimination.Its available bigger self-interference signal decaying, so that narrowband full duplex system
Self-interference problem present in system is preferably solved.
In order to achieve the above purpose, a kind of two-dimensional antenna of narrowband full duplex system of the present invention offsets the basic think of of method
2N (N >=2) root transmitting antenna (composition N is to transmitting antenna) and 1 receiving antenna is arranged in full duplex node in Lu Shi.Full duplex
Node will emit signal and signal be divided into 2N parts by power splitter, then be emitted respectively by 2N root transmitting antenna, Mei Duifa
Antenna is penetrated to be distributed in using receiving antenna as on a radius in the center of circle.Due to N >=2, it is meant that radius number is 2 or more.
It is required that radius divides the circle using receiving antenna as the center of circle equally, and such as: as N=2, shares 2 pairs of transmitting antennas and be located at 2 radiuses
On, this 2 radiuses divide entire circle equally, so they differ 180 degrees, that is, same diametrically；As N=3,3 are shared
Transmitting antenna is located on 3 radiuses, this 3 radiuses divide entire circle equally, so they differ 120 degree；As N=4, altogether
There are 4 pairs of transmitting antennas to be located on 4 radiuses, this 4 radiuses divide entire circle equally, so they differ 90 degree；And so on.
2 transmitting antennas distance in each pair of transmitting antenna is located at the odd number of the receiving antenna phase difference signal carrier wavelength half in the center of circle
Times, and 2 transmitting antennas on each pair of antenna are located at using receiving antenna as on the concentric circles in the center of circle, such N is to transmitting day
The signal of line transmitting meets the principle mutually offseted at receiving antenna, so that self-interference signal is preferably eliminated.
Assuming that the baseband signal of emission source is that x [t] causes its amplitude to be scaled respectively after 2N root transmitting antenna
A11And A12、A21And A22、……AN1And AN2, before reaching receiving antenna, N group signal produces respectivelyWithWithWithDecaying andWithWithWith's
Phase shift.According to our design, in receiving end, the superposed signal that receives are as follows:
N=2,3,4 ...
The signal power received are as follows:
The present invention has the following advantages: this technology is to add N to transmitting on the self-interference based on phase cancellation principle is eliminated
Antenna.In narrowband full duplex system, one is constituted by N pair transmitting antenna and a secondary receiving antenna at the full duplex node of proximal end
Circular antenna array structure, for receiving antenna in the center point, transmitting antenna is distributed in two using receiving antenna as the concentric of the center of circle
It on circle, and is distributed in pairs in a diameter two-by-two, each centering, one of them distance apart from the center of circle is d, another distance circle
The distance of the heart is λ/2 d+, reaches the odd-multiple of paths length phase difference signal carrier wavelength half compared with another, even if
Phase by pi is obtained, the principle mutually offseted is met.It sends signal and is divided into N parts through power splitter from transmitting antenna, while taking place frequently together
It sees off, is superimposed self-interference signal cancellation at receiving antenna, hence it is evident that reduce the interference to receiving end useful signal.
Detailed description of the invention
Fig. 1 is two node single channel full duplex block diagrams of the invention
When Fig. 2 is N=2 of the present invention, i.e. antenna cloth system of battle formations when two pairs of transmission antennas
When Fig. 3 is N=4 of the present invention, i.e. antenna cloth system of battle formations when four pairs of transmission antennas
Fig. 4 is the part cloth system of battle formations of the N to transmission antenna
Fig. 5 be include that RF analog domain offsets, numeric field offsets the stream that the narrowband full duplex self-interference that offsets with antenna is eliminated
Cheng Tu；In figure: transmitting antenna TX11And TX12In pairs, TX21And TX22In pairs ... ..., TXN1And TXN2In pairs；Receiving antenna RX exists
The center point.
Specific embodiment
Below with reference to attached drawing, the invention will be further described, it should be noted that the present embodiment is with this technology side
Premised on case, the detailed implementation method and specific operation process are given, but protection scope of the present invention is not limited to this reality
Apply example.
In order to realize narrowband full duplex system interference cancellation, steps are as follows (as shown in Figure 5) for our realization:
(1) the transmitting signal of full duplex node generates radio frequency transmissions through digital-to-analogue conversion, then through upconverter.Radio frequency hair
Penetrate the power divider that signal is sent into full duplex node.Power divider output signal is sent into transmitting antenna.
(2) full duplex node antennas arrangement is as follows: 2N (N >=2) root transmitting antenna (composition N being arranged altogether in full duplex node
To transmitting antenna) and 1 receiving antenna.Each pair of transmitting antenna of full duplex node is distributed in using receiving antenna as the circle in the center of circle
On one radius.Due to N >=2, it is meant that radius number is 2 or more.It is required that radius is divided equally using receiving antenna as the center of circle
Circle, such as: as N=2, sharing 2 pairs of transmitting antennas and be located on 2 radiuses, this 2 radiuses divide entire circle equally, so it
Differ 180 degree, that is, same diametrically；As N=3, shares 3 pairs of transmitting antennas and be located on 3 radiuses, this
3 radiuses divide entire circle equally, so they differ 120 degree；As N=4, shares 4 pairs of transmitting antennas and be located at 4 radiuses
On, this 4 radiuses divide entire circle equally, so they differ 90 degree；And so on.2 transmitting antennas in each pair of transmitting antenna
Distance is located at the odd-multiple of the receiving antenna phase difference signal carrier wavelength half in the center of circle, and 2 transmitting antennas on each pair of antenna
It is located at using receiving antenna as on the concentric circles in the center of circle, such N meets the signal that transmitting antenna emits at receiving antenna
The principle mutually offseted, so that self-interference signal is preferably eliminated.
(3) radio frequency transmissions of full duplex node are divided into 2N parts by power divider, then pass through 2N root respectively
Transmitting antenna transmitting realizes that self-interference antenna offsets at the receiving antenna of the full duplex node.
(4) after receiving antenna receives the useful signal of other full duplex nodes and completes self-interference cancellation at receiving antenna
This node transmitting signal, then by noise eliminate chip further progress radio frequency interference offset, it is smaller to obtain self-interference
Useful signal.
(5) treated signal is by down-converted to baseband signal, then analog to digital conversion to numeric field, in number
Word domain uses associated reference signal, carries out interference elimination.
(6) it decodes, obtains desired signal.
Wherein, the specific arrangement of full duplex node antennas is as follows in the step (2):
Each full duplex node shares 2N root transmitting antenna, wherein N >=2.Transmitting antenna 1 pair of transmitting antenna of every 2 compositions,
N is shared to transmitting antenna.N is located at using receiving antenna as on N radius of the circle in the center of circle transmitting antenna, and forms two
Concentric circles, 2 strip antennas in each pair of transmitting antenna are located on different concentric circles.N radius is divided equally is with receiving antenna
The circle in the center of circle, i.e. angle between 2 radiuses of arbitrary neighborhood are equal.N is to 2 concentric circles where transmitting antenna, radius difference letter
The odd-multiple of number carrier wavelength half.At receiving antenna, due to transmitting signals to up to position for the transmitting antenna on 2 concentric circles
In the odd-multiple of the path length phase difference signal carrier wavelength half of the receiving antenna in the center of circle, emit signal phase on receiving antenna
Potential difference π, cancellation superposition, realizes that the antenna of self-interference offsets.
For those skilled in the art, it can be made various corresponding according to above technical solution and design
Change and modification, and all these change and modification should be construed as being included within the scope of protection of the claims of the present invention.
Claims (1)
1. a kind of two-dimensional antenna of narrowband full duplex system offsets method, which is characterized in that itself the following steps are included:
(1) the transmitting signal of full duplex node generates radio frequency transmissions through digital-to-analogue conversion, then through upconverter；Radio-frequency transmissions letter
Number be sent into full duplex node power divider, power divider output signal be sent into transmitting antenna；
(2) full duplex node antennas arrangement is carried out；Wherein, full duplex node antennas arrangement is as follows: being arranged altogether in full duplex node
2N root transmitting antenna and 1 receiving antenna, N >=2, transmitting antenna form N to transmitting antenna；Each pair of transmitting day of full duplex node
Line is distributed in using receiving antenna as on a radius of the circle in the center of circle；Radius number is more than or equal to 2, and radius is divided equally to receive day
Line is the circle in the center of circle；As N=2, sharing 2 pairs of transmitting antennas and be located on 2 radiuses, this 2 radiuses divide entire circle equally, and two
Differ 180 degree between radius, that is, same diametrically, as N=3, share 3 pairs of transmitting antennas and be located at 3 half
On diameter, this 3 radiuses divide entire circle equally, differ 120 degree between two adjacent radius, as N=4, share 4 pairs of transmitting antenna difference positions
In on 4 radiuses, this 4 radiuses divide entire circle equally, differ 90 degree between two adjacent radius, and so on；In each pair of transmitting antenna
2 transmitting antennas distance be located at the center of circle receiving antenna phase difference signal carrier wavelength half odd-multiple, and on each pair of antenna
2 transmitting antennas be located at using receiving antenna as on the concentric circles in the center of circle；
I, each full duplex node shares 2N root transmitting antenna, wherein N >=2；Transmitting antenna 1 pair of transmitting antenna of every 2 compositions, altogether
There is N to transmitting antenna；
Ii, N are located at using receiving antenna as on N radius of the circle in the center of circle transmitting antenna, and form two concentric circles, often
2 strip antennas in transmitting antenna are located on different concentric circles；
Iii, N radiuses divide the circle using receiving antenna as the center of circle equally, i.e. angle between 2 radiuses of arbitrary neighborhood is equal；
Iv, N are to 2 concentric circles where transmitting antenna, the odd-multiple of radius phase difference signal carrier wavelength half；In receiving antenna
Locate, the path length phase difference signal of the transmitting antenna on 2 concentric circles transmitted signals to up to the receiving antenna positioned at the center of circle carries
The odd-multiple of wave wavelength half, emits signal phase difference π on receiving antenna, and cancellation superposition realizes that the antenna of self-interference offsets；
(3) radio frequency transmissions of full duplex node are divided into 2N parts by power divider, then emit day by 2N root respectively
Line transmitting, at the receiving antenna of the full duplex node, offsets self-interference antenna；
The radio frequency transmissions of full duplex node are by power divider mean allocation at 2N equal portions；
Assuming that the baseband signal of emission source is that x [t] causes its amplitude to be scaled A respectively after 2N root transmitting antenna11
And A12、A21And A22、……AN1And AN2, before reaching receiving antenna, N group signal produces respectivelyWith With……WithDecaying andWith With……WithPhase shift receive in receiving end
The superposed signal arrived are as follows:
N=2,3,4......, the signal of transmitting antenna reaches in pairs is eliminated at receiving antenna；
(4) sheet after receiving antenna receives the useful signal of other full duplex nodes and completes self-interference cancellation at receiving antenna
The transmitting signal of node, then chip further progress radio frequency interference is eliminated by noise and is offset, it is smaller useful to obtain self-interference
Signal；
(5) treated signal is by down-converted to baseband signal, then analog to digital conversion to numeric field, in numeric field
Using associated reference signal, interference elimination is carried out；
(6) it decodes, obtains desired signal；
Step (3), is eliminated described in (5) (4) by antenna interference, is also helped and is disappeared with the interference that the noise of radio frequency domains eliminates chip
The self-interference of narrowband full duplex system is eliminated except the interference elimination collective effect of the associated reference signal with numeric field.
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| CN107294888B (en) * | 2016-04-11 | 2020-08-14 | 联发科技股份有限公司 | Equalization enhancement module, demodulation system and equalization enhancement method |
| EP3520313B1 (en) * | 2016-09-30 | 2022-03-02 | Sony Group Corporation | Antenna configuration switching for full-duplex transmission |
| CN106452499A (en) * | 2016-10-25 | 2017-02-22 | 北京小米移动软件有限公司 | Signal emission method and device |
| CN106772336B (en) * | 2017-02-28 | 2019-09-03 | 西安电子科技大学 | System and implementation method of radar detection and communication detection integration |
| CN109412630B (en) * | 2018-11-16 | 2020-07-14 | Oppo（重庆）智能科技有限公司 | Self-interference elimination method, terminal and computer storage medium |
| CN114449650A (en) * | 2021-12-13 | 2022-05-06 | 西安电子科技大学 | A 5G-based single base station positioning method |
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| CN103634022A (en) * | 2013-12-09 | 2014-03-12 | 电子科技大学 | Full-duplex transceiver in flat fading environment and method for canceling self-interference |
| CN103685098A (en) * | 2012-09-07 | 2014-03-26 | 华为技术有限公司 | Method, device and system for processing interference signals |
| CN104052512A (en) * | 2013-03-12 | 2014-09-17 | 华为技术有限公司 | Radio-frequency interference cancellation method and system |
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| US20120154249A1 (en) * | 2010-12-13 | 2012-06-21 | Nec Laboratories America, Inc. | Method for antenna cancellation for wireless communication |
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| CN103685098A (en) * | 2012-09-07 | 2014-03-26 | 华为技术有限公司 | Method, device and system for processing interference signals |
| CN104052512A (en) * | 2013-03-12 | 2014-09-17 | 华为技术有限公司 | Radio-frequency interference cancellation method and system |
| CN103634022A (en) * | 2013-12-09 | 2014-03-12 | 电子科技大学 | Full-duplex transceiver in flat fading environment and method for canceling self-interference |
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