CN103701510B - Wireless full-duplex multiple input multiple output communications simulate self-interference signal eliminating apparatus - Google Patents
Wireless full-duplex multiple input multiple output communications simulate self-interference signal eliminating apparatus Download PDFInfo
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- CN103701510B CN103701510B CN201310750505.5A CN201310750505A CN103701510B CN 103701510 B CN103701510 B CN 103701510B CN 201310750505 A CN201310750505 A CN 201310750505A CN 103701510 B CN103701510 B CN 103701510B
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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
Abstract
Self-interference signal eliminating apparatus is simulated the invention discloses a kind of wireless full-duplex multiple input multiple output communications, every transmitting chain all the way of transceiver constitutes an antenna pairs with shared two antennas of receives link, two described antennas send and receive signal simultaneously, and for per the signal launched all the way, two antennas distinguish the opposite signal of transmission power same phase；Multipair described antenna pair is put with star symmetric form, i.e. the midpoint of each pair antenna pair intersects at a point；Or put with mirrored versions, i.e., the perpendicular bisector of each pair antenna pair is overlapped.The present invention is simple in construction, effectively eliminates the intensity of simulation self-interference signal, realizes multiple-input and multiple-output（MIMO）Elimination of the expansion, realization of number of links to the simulation self-interference signal of wireless full-duplex multiple input multiple output communications.
Description
Technical field
The present invention relates to wireless communication technology field, more particularly to a kind of wireless full-duplex multiple input multiple output communications mould
Intend self-interference signal eliminating apparatus.
Background technology
Traditional radio communication uses FDD and time division duplex, and FDD is using simultaneously up on different frequency bands
And downlink communication, and time division duplex uses and is divided into small time slot continuous time, in same frequency range different time-gap uplink and downlink
Communication, therefore FDD and time division duplex are inherently half-duplex operations.Full-duplex communication is referred in same frequency range
The communication of uplink and downlink simultaneously.
Compared to half duplex techniques, full duplex technology can effectively improve the utilization rate of frequency and strengthen transceiver
Function.Realize that the wireless full-duplex communication technology needs to eliminate its own transmission signal to the influence for the signal for needing to receive, be referred to as
Eliminated for self-interference signal.And maximum difficult point therein is the elimination to simulating self-interference signal, i.e., enter number in signal
Self-interference before word analog converter (ADC) is eliminated.
It is multiple that multiple-input and multiple-output (MIMO) communication refers to that same transceiver is carried out using many antennas in the same time
Signal inputs the communication with multiple signal outputs.Multiple input multiple output communications also can effectively improve the speed of communication, at present should
Technology has been obtained for universal application.And wireless full-duplex multiple input multiple output communications refer to transceiver in identical frequency band
It is upper to carry out multichannel input and multiple-channel output simultaneously, the advantage of wireless duplex communication and multiple-input and multiple-output is made full use of, further
Traffic rate and the availability of frequency spectrum are improved, strengthens the function of transceiver.
Realize that wireless full-duplex multiple input multiple output communications need to realize to all per receives link all the way in transceiver
Self-interference signal that transmitting antenna is sent is eliminated, compared to the wireless duplex communication of single-input single-output, and self-interference signal disappears
Except becoming more difficult, and the elimination of simulation self-interference signal therein is the emphasis eliminated.
Current wireless full-duplex multiple input multiple output communications not yet have correlative study achievement at home, abroad only NEC
Laboratory proposes a kind of wireless full-duplex multiple-input and multiple-output cancellation element (ACM, Mobicom, 2012:257-268,
“MIDU:Enabling MIMO full duplex "), in the method, pass through the orthogonal arrangement method of four antennas
Realize that the simulation self-interference signal of single-input single-output is eliminated, realizing that the simulation self-interference signal of one 3 output of input 3 is eliminated needs
12 antennas are wanted, and all transmitting antennas and putting for reception antenna must be mutually perpendicular to.Realize what the cancellation element needed
Antenna amount is a lot, and the disposing way of antenna is fixed, dumb, and it is more that antenna puts space-consuming, therefore is very difficult to apply in
In actual device.
Traditional signal clearing method is realized for realizing wireless full-duplex multiple input multiple output communications and not applying to
It is still a problem that wireless full-duplex multiple input multiple output communications simulation self-interference signal, which is eliminated,.
The content of the invention
In order to overcome the above-mentioned deficiencies of the prior art, the invention provides a kind of wireless full-duplex multiple input multiple output communications
Simulate self-interference signal eliminating apparatus.
The technical solution adopted in the present invention is as follows：
A kind of wireless full-duplex multiple input multiple output communications simulate self-interference signal eliminating apparatus, and its feature is：Transmitting-receiving
Every transmitting chain all the way of machine constitutes an antenna pairs with shared two antennas of receives link, and two described antennas are sent simultaneously
With receive signal, and for per the signal launched all the way, the opposite signal of two antennas difference transmission power same phases；
Multipair described antenna pair is put with star symmetric form, i.e. the midpoint of each pair antenna pair intersects at a point；Or
Put with mirrored versions, i.e., the perpendicular bisector of each pair antenna pair is overlapped.
Described antenna pair includes：Signal transmitting terminal, 180 degree power divider, first annular device, the second circulator,
One antenna, the second antenna, power combiner and signal receiving end；
Described signal transmitting terminal is connected with the input of 180 degree power divider, and the 180 degree power divider will be sent
Signal is divided into that power is equal, opposite in phase two-way symmetric signal is respectively by the first output end of 180 degree power divider and
Two output ends are exported, and first via sending signal enters No. 1 port of the first circulator, then by No. 2 ports of the first circulator
Output, is launched by the first antenna being connected on No. 2 ports of the first circulator, and the second tunnel sending signal enters the second ring
No. 1 port of row device, is then exported by No. 2 ports of the second circulator, by be connected on No. 2 ports of the second circulator the
Two antennas are launched；
The first via that described first antenna is received receives No. 2 ports that signal enters the first circulator, then via
After No. 3 ports output of first circulator, the first input end of ingoing power synthesizer, the second described antenna receive the
Two tunnels receive No. 2 ports that signal enters the second circulator, after then being exported by No. 3 ports of the second circulator, ingoing power
Second input of synthesizer, the described first via receives signal and the second tunnel receives signal and merges into one through power combiner
Road, is exported, and received by signal receiving end by the output end of power combiner.
The present invention realizes transmitting and the multiple signals for carrying out multiple wireless signal simultaneously in same frequency range using many antennas
Reception.Put for antenna pair with star symmetric form, the midpoint of all antenna pairs intersects at a point, wherein：Each group day
The distance between two antennas of line pair can be with equal, can also be unequal, the angle between different antennae pair can with identical,
It can differ.Put for antenna pair with mirrored versions, the perpendicular bisector of all antenna pairs overlaps, wherein：It is each
The distance between two antennas of group antenna pair can be with equal, can also be unequal, different antennae to the distance between can phase
Deng can also be unequal.Two antennas of every group of antenna pair are identical with circulator.The transmission signal of transmitting chain reaches reception chain
Lu Shi, signal intensity is greatly reduced.
Compared with prior art, the beneficial effects of the invention are as follows simple in construction, simulation self-interference signal is effectively eliminated
Intensity, realizes the expansion of multiple-input and multiple-output (MIMO) number of links.Effectively realize wireless full-duplex multiple input multiple output communications
Simulation self-interference elimination.
Brief description of the drawings
Fig. 1 is that the output antenna pair star symmetric form of 3 input 3 puts schematic diagram；
Fig. 2 is that the output antenna pair mirrored versions of 3 input 3 put schematic diagram.
Fig. 3 is the structural representation of a pair of antenna pairs.
Embodiment
The present invention is further described with reference to the accompanying drawings and examples, but the protection model of the present invention should not be limited with this
Enclose.
It is the one 3 antenna pair star symmetric form placing structure for inputting 3 outputs with reference to shown in Fig. 1, wherein, every a pair
The midpoint of antenna must intersect at a point, with reference to the O points in Fig. 1, and the distance between two antennas of each antenna pair can not
Equal, with reference to AA ' in Fig. 1 ≠ BB ', the angle formed between different antennae pair can be with unequal, with reference to ∠ COA ≠ ∠ in Fig. 1
AOB.According to mentioned above principle, the antenna pair star symmetric form placing structure can be expanded as any multiple-input and multiple-output structure.
With reference in Fig. 1, in 3 input, 3 export structures, first couple of antenna AA ' needs to eliminate the signal of oneself transmitting, together
When also need to eliminate the signals that send of second couple of antenna BB ' and the 3rd couple of antenna CC '；Second couple of antenna BB ' needs to eliminate oneself
The signal of transmitting also needs to eliminate the signal that first couple of antenna AA ' and the 3rd couple of antenna CC ' is sent simultaneously；3rd couple of antenna CC '
Need to eliminate the signal of oneself transmitting while also needing to eliminate the signal that first couple of antenna AA ' and second couple of antenna BB ' is sent.
The signal and second couple of antenna BB ' and the 3rd couple of antenna CC ' of oneself transmitting are eliminated with first couple of antenna AA ' below
Exemplified by the signal of transmitting, illustrate and how to realize that simulation self-interference signal is eliminated.
First, as shown in figure 3, a pair of antenna pairs include：Signal transmitting terminal 1,180 degree power divider 2, first annular device
3rd, the second circulator 4, first antenna 5, the second antenna 6, power combiner 7 and signal receiving end 8；Described signal transmitting terminal with
Sending signal is divided into that power is equal, opposite in phase by the input connection of 180 degree power divider, the 180 degree power divider
Two-way symmetric signal exported respectively by the first output end of 180 degree power divider and the second output end, the first via sends letter
No. 1 port of number circulator of entrance first, is then exported by No. 2 ports of the first circulator, by being connected to the first circulator 2
First antenna on number port is launched, and the second tunnel sending signal enters No. 1 port of the second circulator, then by the second ring
No. 2 ports output of row device, is launched by the second antenna being connected on No. 2 ports of the second circulator；Described first
The first via that antenna is received receives No. 2 ports that signal enters the first circulator, then via No. 3 ports of the first circulator
After output, the first input end of ingoing power synthesizer, the second tunnel that the second described antenna is received receives signal and enters the
No. 2 ports of two circulators, after then being exported by No. 3 ports of the second circulator, the second input of ingoing power synthesizer,
The described first via receives signal and the second tunnel receives signal and merged into all the way through power combiner, by the output of power combiner
End output, and received by signal receiving end.
Two antennas receiving and transmitting signal simultaneously, wherein by transmission signal respectively by two antennas respectively with the shape of inversion signal
Formula is launched, while the linearly that two antennas are received is combined, by the design of symmetric circuit, is realized to oneself
The elimination of transmission signal.
Secondly, the signal sent for second couple of antenna BB ', with reference in Fig. 1, antenna A receives antenna B and antenna simultaneously
The signal that B ' is sent, antenna A ' can also receive the signal that antenna B and antenna B ' are sent simultaneously, due to first couple of antenna AA's '
Receive signal end and take linear superposition, therefore first couple of antenna AA ' receiving terminal for antenna A and antenna A ' signal received
It is respectively to come from path BA, BA ', B to receive the signal that second couple of antenna BB ' send ' A, the superposition of the road signals of B ' A ' four.By
Intersected at a point in antenna pair AA ' and BB ' midpoint, therefore path length BA=B ' A ', antenna B and antenna B ' send work(respectively
The opposite signal of rate same phase, by equal path, the path attenuation and delay of generation are also equal, therefore antenna B transmittings
The signal that signal reaches antenna A and antenna B ' transmittings is reached after antenna A ' linear superpositions, because two-way power is equal, phase phase
Instead, so as to realize mutual elimination.Meanwhile, due to the path attenuation that signal is propagated between different antennae pair, further reduce certainly
The intensity of interference signal.Similarly understand, the signal of antenna B transmittings reaches the signal arrival antenna A of antenna A ' and antenna B ' transmittings
Elimination is also overlapped mutually afterwards, it is achieved thereby that elimination of first pair of antenna AA ' receiving terminal to second pair of antenna BB ' transmission signal.
The signal sent finally, for the 3rd couple of antenna CC ', with reference in Fig. 1, with eliminating what second couple of antenna BB ' was sent
Signal principle is identical, and first couple of antenna AA ' can also realize the elimination that signal is sent to the 3rd couple of antenna CC '.
To sum up, first couple of antenna AA ' realizes elimination to oneself transmission signal and to second couple of antenna BB ' and the 3rd
Elimination to antenna CC ' transmission signals.
Identical with first couple of antenna AA ' elimination principle, second couple of antenna BB ' and the 3rd couple of antenna CC ' can also distinguish
Realize that the self-interference signal launched all antenna pairs is effectively eliminated, it is achieved thereby that how defeated wireless full-duplex multi input is
Go out to simulate the elimination of self-interference signal.
It is the one 3 antenna pair mirrored versions placing structure for inputting 3 outputs with reference to shown in Fig. 2, wherein, every a pair
The perpendicular bisector of antenna must be overlapped, the distance between two antennas of each antenna pair can with unequal, with reference to AA ' in Fig. 2 ≠
The distance formed between BB ', different antennae pair can be with unequal, with reference to MN ≠ NL in Fig. 2.According to mentioned above principle, the antenna pair
Mirrored versions placing structure can be expanded as any multiple-input and multiple-output structure.
With reference in Fig. 2, in 3 input, 3 export structures, first couple of antenna AA ' needs to eliminate the signal of oneself transmitting, together
When also need to eliminate the signals that send of second couple of antenna BB ' and the 3rd couple of antenna CC '；Second couple of antenna BB ' needs to eliminate oneself
The signal of transmitting also needs to eliminate the signal that first couple of antenna AA ' and the 3rd couple of antenna CC ' is sent simultaneously；3rd couple of antenna CC '
Need to eliminate the signal of oneself transmitting while also needing to eliminate the signal that first couple of antenna AA ' and second couple of antenna BB ' is sent.
The signal and second couple of antenna BB ' and the 3rd couple of antenna CC ' of oneself transmitting are eliminated with first couple of antenna AA ' below
Exemplified by the signal of transmitting, illustrate and how to realize that simulation self-interference signal is eliminated.
First, ibid, first couple of antenna AA ' receiving terminal can realize the elimination to oneself transmission signal.
Secondly, the signal sent for second couple of antenna BB ', with reference in Fig. 2, antenna A receives antenna B and antenna simultaneously
The signal that B ' is sent, antenna A ' can also receive the signal that antenna B and antenna B ' are sent simultaneously, due to first couple of antenna AA's '
Receive signal end and use linear superposition, therefore first couple of antenna AA ' receiving terminal for antenna A and antenna A ' signal received
It is respectively to come from path BA, BA ', B to receive the signal that second couple of antenna BB ' send ' A, the superposition of the road signals of B ' A ' four.By
Overlapped in antenna pair AA ' and BB ' perpendicular bisector, therefore path length BA=B ' A ', antenna B and antenna B ' send work(respectively
The opposite signal of rate same phase, by equal path, the path attenuation and delay of generation are also equal, therefore antenna B transmittings
The signal that signal reaches antenna A and antenna B ' transmittings is reached after antenna A ' linear superpositions, because two-way power is equal, phase phase
Instead, so as to realize mutual elimination.Meanwhile, due to the path attenuation that signal is propagated between different antennae pair, further reduce certainly
The intensity of interference signal.Similarly understand, the signal of antenna B transmittings reaches the signal arrival antenna A of antenna A ' and antenna B ' transmittings
Elimination is also overlapped mutually afterwards, it is achieved thereby that elimination of first pair of antenna AA ' receiving terminal to second pair of antenna BB ' transmission signal.
The signal sent finally, for the 3rd couple of antenna CC ', with reference in Fig. 2, with eliminating what second couple of antenna BB ' was sent
Signal principle is identical, and first couple of antenna AA ' can also realize the elimination that signal is sent to the 3rd couple of antenna CC '.
To sum up, first couple of antenna AA ' realizes elimination to oneself transmission signal and to second couple of antenna BB ' and the 3rd
Elimination to antenna CC ' transmission signals.
Identical with first couple of antenna AA ' elimination principle, second couple of antenna BB ' and the 3rd couple of antenna CC ' can also distinguish
Realize that the self-interference signal launched all antenna pairs is effectively eliminated, it is achieved thereby that how defeated wireless full-duplex multi input is
Go out to simulate the elimination of self-interference signal.
To sum up, the present invention is put using antenna pair star symmetric form or antenna pair mirrored versions are put, respectively
Effective elimination that self-interference signal is simulated to wireless full-duplex multiple-input and multiple-output is realized, so that how defeated meet wireless full-duplex
Enter the elimination requirement to simulating self-interference signal in multi output communication.So, the present invention effectively overcomes kind of the prior art
Plant shortcoming and have high industrial utilization.
The above-described embodiments merely illustrate the principles and effects of the present invention, not for the limitation present invention.It is any ripe
Know the personage of this technology all can carry out modifications and changes under the spirit and scope without prejudice to the present invention to above-described embodiment.Cause
This, those of ordinary skill in the art is complete without departing from disclosed spirit and institute under technological thought such as
Into all equivalent modifications or change, should by the present invention claim be covered.
Claims (1)
1. a kind of wireless full-duplex multiple input multiple output communications simulate self-interference signal eliminating apparatus, it is characterised in that：Transceiver
Per transmitting chain all the way and shared two antennas of receives link constitute an antenna pairs, two described antennas send simultaneously and
Signal is received, and for per the signal launched all the way, two antennas distinguish the opposite signal of transmission power same phase；
Multipair described antenna pair is put with star symmetric form, i.e. the midpoint of each pair antenna pair intersects at a point；Or with mirror
As symmetric form is put, i.e., the perpendicular bisector of each pair antenna pair is overlapped；
Described antenna pair includes：Signal transmitting terminal (1), 180 degree power divider (2), first annular device (3), the second annular
Device (4), first antenna (5), the second antenna (6), power combiner (7) and signal receiving end (8)；
Described signal transmitting terminal is connected with the input of 180 degree power divider, and the 180 degree power divider is by sending signal
It is divided into that power is equal, opposite in phase two-way symmetric signal is defeated by the first output end of 180 degree power divider and second respectively
Go out end output, first via sending signal enters No. 1 port of the first circulator, then exported by No. 2 ports of the first circulator,
Launched by the first antenna being connected on No. 2 ports of the first circulator, the second tunnel sending signal enters the second circulator
No. 1 port, then by the second circulator No. 2 ports export, pass through second day be connected on No. 2 ports of the second circulator
Line is launched；
The first via that described first antenna is received receives No. 2 ports that signal enters the first circulator, then via first
After No. 3 ports output of circulator, the first input end of ingoing power synthesizer, the second tunnel that the second described antenna is received
No. 2 ports that signal enters the second circulator are received, after then being exported by No. 3 ports of the second circulator, ingoing power synthesis
Second input of device, the described first via receives signal and the second tunnel receive signal through power combiner merge into all the way, by
The output end output of power combiner, and received by signal receiving end.
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| US10530556B2 (en) * | 2015-03-05 | 2020-01-07 | Telefonaktiebolaget Lm Ericsson (Publ) | Full-duplex power reporting |
| CN106357299A (en) * | 2016-08-30 | 2017-01-25 | 上海交通大学 | Radio frequency self-interference eliminating system applied to in-band full duplex system integrating MIMO (multi-input multi-output) |
| CN107872241B (en) * | 2016-09-23 | 2019-11-12 | 北京大学（天津滨海）新一代信息技术研究院 | With frequency, full duplex system self-interference inhibits system to single antenna simultaneously |
| CN108627823A (en) * | 2017-03-15 | 2018-10-09 | 上海涵适电子科技有限公司 | Ground radar safety-protection system |
| CN112543037B (en) * | 2019-09-20 | 2022-05-24 | 华为技术有限公司 | Communication equipment, radio frequency interference elimination method and device |
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