CN108616293A - The method mutually interfered between multipair even array element is eliminated in single antenna full-duplex communication - Google Patents
The method mutually interfered between multipair even array element is eliminated in single antenna full-duplex communication Download PDFInfo
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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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
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- H04L5/1461—Suppression of signals in the return path, i.e. bidirectional control circuits
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Abstract
The invention discloses a kind of to eliminate the method mutually interfered between multipair even array element in single antenna full-duplex communication, and Integral Thought is as follows：One, it is based on mutual interference cancellation principle, studies the basic unit of the mutual Interference Cancellation of more array elements, establishes the Equivalent Base-Band model for the main radio-frequency channel of the multipair even array element of single antenna；Two, it based on positive and negative array element distribution using single pair idol array element as the fractal model of basic unit, is designed, forms energy multidimensional and offsets point shape array element that more array elements are mutually interfered.The invention has the beneficial effects that：1, dual-mode antenna shares an antenna, saves some antennas and bandwidth resources；2, under the premise of ensureing not waste antenna resources, the mutual interference during co-channel full duplex communicates simultaneously is effectively eliminated, and then the spectrum efficiency of communication is effectively improved, makes spectrum efficiency higher；3, it is suitable for large scale communication scenario.
Description
Technical field
The present invention relates to eliminate the method mutually interfered between multipair even array element, and in particular in single antenna while co-channel full duplex
The method mutually interfered between multipair even array element is eliminated in communication, belongs to field of communication technology.
Background technology
It is wireless at the same with frequency double source full duplex transmission refer in the same wireless physical channel by two source nodes to
The transmission of the signal of two destination nodes, wherein at least one node be not only source node but also be purpose node.
It is wireless while being the one kind that can be practical under small scale communication environment in recent years with frequency double source full duplex
Effectively promote the technology of communication spectrum efficiency.Compared to traditional half-duplex, (only there are one sources to save on the same same time slot of frequency range
Point transmission data and a destination node receive data), frequency wireless while that 1 times can be theoretically promoted with frequency double source full duplex
Spectrum efficiency, to inherently increase the ability of wireless network dilatation.It should further be appreciated that wireless while with frequency double source full duplex mould
Formula can replace frequency division duplex and time division duplex both traditional semiduplex modes, realize the unification of duplex mode, to for
Seamless unified communication provides effective way.
Unify simultaneously as mode with frequency double source full duplex, dual-mode more higher than conventional half duplex spectrum efficiency, by
To the extensive concern of academia and industrial quarters.However, the demand with people to large capacity, highly compatible communication is growing day by day,
Such as some current wearable smart machines (smartwatch, intelligent glasses, smart mobile phone etc.), how to realize spectrum efficiency more
It is high, how preferably to eliminate in future wireless system from/mutually interference, how to realize that duplex mode uniform transmission becomes the next generation
Wirelessly communicate (5G) problem in the urgent need to address.
The local power leakage of co-channel full duplex communication simultaneously can lead to serious self-interference, therefore effectively eliminate with frequency
Loop self-interference is the premise that full duplex is able to apply.
Wireless while in frequency double source full-duplex communication, inhibit and offset in communication from/mutually perturbation technique substantially may be used
To be summarized as three kinds：
(1) domain self-interference suppression technology is propagated, which is mainly significantly weakened certainly in spatial domain using radio-frequency technique
Interference, to avoid the input terminal of receiving terminal radio frequency amplifier from generating " briquettability self-interference "；
(2) analog domain self-interference cancellation technology, which is to reduce self-interference in receiving terminal, to avoid analog-digital converter
Input suppressed by self-interference；
(3) numeric field self-interference cancellation technology, the technology are mainly carried out accurately portraying reconstruct and be eliminated to remaining self-interference,
Overcome the factors such as distortion, the non-linear of analog-digital converter, the transmitting-receiving crystal oscillator phase error of radio frequency amplifier to self-interference simultaneously
It influences.
There are one common features for above-mentioned three kinds of technologies, exactly require that dual-mode antenna cannot be same root antenna, i.e., all
It is to be unfolded around multiple antennas, the purpose for the arrangement is that in order not to generate this antenna loop self-interference to transmitting antenna, but due to
Receive and dispatch not common antenna, hence it is evident that waste some antennas resource.
For antenna and bandwidth resources increasingly in short supply, explores dual-mode antenna and share an antenna (i.e. around single antenna exhibition
Open) and be not to replace resource to exchange the full duplex of full duplex spectrum efficiency promotion for from/mutual interference elimination method, to not with antenna
To wirelessly communicate key.
In addition, there are one common features for above-mentioned three kinds of technologies, that is, be not all suitable for large scale communication scenario, example
Such as the communication that transmission range is 1 kilometer.
Invention content
To solve the deficiencies in the prior art, the purpose of the present invention is to provide one kind be suitable for large scale communication scenario,
The method mutually interfered between multipair even array element is eliminated in single antenna co-channel full duplex communication simultaneously.
In order to realize that above-mentioned target, the present invention adopt the following technical scheme that：
The method mutually interfered between multipair even array element is eliminated in single antenna full-duplex communication, which is characterized in that including following
Step：
One, the Equivalent Base-Band model for the main radio-frequency channel of the multipair even array element of single antenna is established
First, the Equivalent Base-Band model for the main radio-frequency channel of single antenna single pair idol array element, the equivalent baseband model are established
Formula it is specific as follows：
Wherein：
Ip(t) impulse response of the positive main radio-frequency channel of array element is indicated；
In(t) impulse response of the negative main radio-frequency channel of array element is indicated；
L indicates the multipath number in multipath channel；
al(t) amplitude response in the paths l is indicated；
θl(t) phase shift in the paths l is indicated；
τlIndicate the time delay in the paths l；
δ(t-τl) indicate that when time delay be τlWhen impulse function；
J indicates the unit of imaginary number；
It established is rolled up preceding for the Equivalent Base-Band model of the main radio-frequency channel of positive and negative array element and the channel of circulator
Product, obtains the new expression formula of the channel of circulator, specific as follows：
Wherein：
* convolution is indicated；
εabIndicate the time delay (ab ∈ { 12,13,23 }) of the port a to port b from the circulator of positive array element；
Indicate the time delay (ab ∈ { 12,13,23 }) of the port a to port b from the circulator of negative array element；
kab(t-εab) indicate from the amplitude response of the port a to port b of the circulator of positive array element (ab ∈ 12,13,
23})；
Indicate from the amplitude response of the port a to port b of the circulator of negative array element (ab ∈ 12,13,
23})；
ωab(t-εab) indicate phase shift (ab ∈ { 12,13,23 }) from the port a to port b of the circulator of positive array element；
Indicate the phase shift (ab ∈ { 12,13,23 }) of the port a to port b from the circulator of negative array element；
hn,p(t-ηn,p) indicate that the pulse of the wireless channel circulator from the circulator of negative array element to positive array element is rung
It answers, ηn,pIt is its time delay；
hp,n(t-ηp,n) indicate that the pulse of the wireless channel circulator from the circulator of positive array element to negative array element is rung
It answers, ηp,nIt is its time delay；
Then, it on the basis of single pair idol array element Equivalent Base-Band model, establishes for the main radio frequency of the multipair even array element of single antenna
The Equivalent Base-Band model in channel is reference with i-th of antithesis array element, and the formula of the equivalent baseband model is specific as follows：
Wherein：
Ii,p(t) impulse response of the main radio-frequency channel of positive array element in i-th of antithesis array element is indicated；
Ii,n(t) impulse response of the main radio-frequency channel of negative array element in i-th of antithesis array element is indicated；
Formula indicates the impulse response in positive array element self-interference channel in i-th of antithesis array element；
Formula indicates the arteries and veins of the mutual interfering channel between positive array element and other I-1 positive array elements in i-th of antithesis array element
Punching response；
Formula indicates that the pulse of the mutual interfering channel between positive array element and other I negative array elements in i-th of antithesis array element is rung
It answers；
Formula indicates to bear the impulse response in array element self-interference channel in i-th of antithesis array element；
Formula indicates to bear the arteries and veins of the mutual interfering channel between array element and other I-1 negative array elements in i-th of antithesis array element
Punching response；
Formula indicates that the pulse that the mutual interfering channel between array element and other I positive array elements is born in i-th of antithesis array element is rung
It answers；
* convolution is indicated；
L indicates the multipath number in multipath channel；
I indicates the number of antithesis array element；
τlIndicate the time delay in the paths l；
εi,abIt indicates from the port a of the circulator of i-th of positive array element to port b time delays (ab ∈ { 12,13,23 })；
It indicates from the port a of the circulator of i-th of negative array element to port b time delays (ab ∈ { 12,13,23 })；
εj,abIt indicates from the port a of the circulator of j-th of positive array element to port b time delays (ab ∈ { 12,13,23 })；
It indicates from the port a of the circulator of j-th of negative array element to port b time delays (ab ∈ { 12,13,23 })；
al(t-τl) indicate the amplitude response in l paths；
θl(t-τl) indicate the phase shift in l paths；
ki,ab(t-εi,ab) indicate from the amplitude response of the port a to port b of the circulator of i-th of positive array element (ab ∈ 12,
13,23})；
Indicate from the amplitude response of the port a to port b of the circulator of i-th of negative array element (ab ∈ 12,
13,23})；
kj,ab(t-εj,ab) indicate from the amplitude response of the port a to port b of the circulator of j-th of positive array element (ab ∈ 12,
13,23})；
Indicate from the amplitude response of the port a to port b of the circulator of j-th of negative array element (ab ∈ 12,
13,23})；
ωi,ab(t-εi,ab) indicate phase shift from the port a to port b of the circulator of i-th of positive array element；
Indicate the phase shift of the port a to port b from the circulator of i-th of negative array element；
ωj,ab(t-εj,ab) indicate phase shift from the port a to port b of the circulator of j-th of positive array element；
Indicate the phase shift of the port a to port b from the circulator of j-th of negative array element；
hjp,ip(t-ηjp,ip) indicate from the circulator of j-th of positive array element to the circulator of i-th of positive array element it is wireless
The impulse response of channel, ηjp,ipIt is its time delay；
hjn,ip(t-ηjn,ip) indicate from the circulator of j-th of negative array element to the circulator of i-th of positive array element it is wireless
The impulse response of channel, ηjn,ipIt is its time delay；
hjn,in(t-ηjn,in) indicate from the circulator of j-th of negative array element to the circulator of i-th of negative array element it is wireless
The impulse response of channel, ηjn,inIt is its time delay；
hjp,in(t-ηjp,in) indicate from the circulator of j-th of positive array element to the circulator of i-th of negative array element it is wireless
The impulse response of channel, ηjp,inIt is its time delay；
Two, fractal structure is designed
Using Rectangle Fractal, I antithesis array element, in ideal conditions, one are disposed on the geometry of Rectangle Fractal
Positive array element and negative array element in a antithesis array element can ensure that the mutual interference between good orthogonality and different antithesis array elements is
0, Wo MenyongOutput of multiple antithesis array elements after dividing shape Interference Cancellation is believed in the case of indicating the multipair even array element of single antenna
Number,Expression formula is specific as follows：
Wherein：
yu(t) indicate that useful signal, x (t) indicate locally known interference signal, γi(t) it indicates from i antithesis array element
The channel impulse response between port 3 is arrived in the port 2 of the circulator of positive and negative array element；
Indicate the self-interference impulse response of the main radio-frequency channel of i-th of antithesis array element；
And if only if i=j, indicate that the mutual disturbing pulse of the main radio-frequency channel of i-th of antithesis array element is rung
It answers；
Indicate that the homopolarity between j-th of positive/negative array element and i-th of positive/negative array element mutually interferes arteries and veins
Punching response；
Indicate the heteropolar mutual interference arteries and veins between j-th of positive/negative array element and i-th of positive negative array element
Punching response；
What μ was indicated is fractal coefficient；
When antithesis array element is uniformly distributed on Rectangle Fractal, μ=0；
When antithesis array element uneven distribution on Rectangle Fractal, the computational methods of μ are as follows：
The jamming power that we distribute to each array element is all PT, then the reception that can obtain i-th of antithesis array element is mutual
Jamming power Pi,rFor：
Wherein：
Indicate j-th of positive/negative array element to i-th of positive/negative array element distance；
In Rectangle Fractal structure, because in the presence ofAndPass
System, so the mutual jamming power P between the multipair even array element of single antennarFor：
The fractal structure of rectangle can offset the heteropolar mutual interference between different antithesis array elements, thereforeIt can be write as
Following form：
In view of fractal coefficient is nonnegative number, so fractal coefficient μ can be expressed as：
Work as satisfactionCondition when, can theoretically offset the mutual interference between different antithesis array elements.
The invention has the beneficial effects that：
1, dual-mode antenna shares an antenna, saves some antennas and bandwidth resources；
2, it under the premise of ensureing not waste antenna resources, effectively eliminates while mutual dry in co-channel full duplex communication
It disturbs, and then effectively improves the spectrum efficiency of communication, make spectrum efficiency higher；
3, because of spectrum efficiency higher, it is suitable for large scale communication scenario.
Description of the drawings
Fig. 1 is the system block diagram of the single antenna single pair idol array element of the present invention；
Fig. 2 is the Rectangle Fractal structural schematic diagram of the multipair even array element of the single antenna of the present invention；
Fig. 3 is that mutually front and back comparison diagram is eliminated in interference between the multipair even array element of single antenna.
Specific implementation mode
In the method provided by the invention eliminated in single antenna full-duplex communication and mutually interfered between multipair even array element, Dan Tian
The multipair even array element of line refers to piece antenna of transmit-receive sharing, and wherein configures several antithesis array elements, each antithesis array element by one just
Array element is formed with a negative array element, and positive array element emits same signal with negative array element, and the two phase differs 180 degree.
The present invention's eliminates the method mutually interfered between multipair even array element in single antenna full-duplex communication, and Integral Thought is such as
Under：
First, it is based on mutual interference cancellation principle, studies the basic unit of the mutual Interference Cancellation of more array elements, i.e., single array element self-interference
Offset the mixed structure with the mutual interference cancellation of antithesis array element；
Then, based on positive and negative array element distribution using single pair idol array element as the fractal model of basic unit, is designed, being formed can multidimensional
Offset point shape array element that more array elements are mutually interfered.
In the present invention, we use Rectangle Fractal.The present invention is made below in conjunction with the drawings and specific embodiments specific
It introduces.
It is provided by the invention that the method mutually interfered between multipair even array element is eliminated in single antenna co-channel full duplex communication simultaneously,
It specifically includes following steps：
One, the Equivalent Base-Band model for the main radio-frequency channel of the multipair even array element of single antenna is established
First, we first establish the Equivalent Base-Band mould for main radio-frequency channel (signal path) in the case of single pair idol array element
Type, and then derive the Equivalent Base-Band model of the main radio-frequency channel of multipair even array element.
In method provided by the invention, single antenna single pair idol array element refers to piece antenna of transmit-receive sharing, and wherein configures one
A positive array element and a negative array element, positive array element emit same signal with negative array element, and the two phase differs 180 degree.
Fig. 1 is the system block diagram of the single antenna single pair idol array element of the present invention.
In the case of single pair idol array element, the Equivalent Base-Band model of the main radio-frequency channel of single pair idol array element is specific as following
Shown in formula：
Wherein：
Ip(t) impulse response of the positive main radio-frequency channel of array element is indicated；
In(t) impulse response of the negative main radio-frequency channel of array element is indicated；
L indicates the multipath number in multipath channel；
al(t) amplitude response in the paths l is indicated；
θl(t) phase shift in the paths l is indicated；
τlIndicate the time delay in the paths l；
δ(t-τl) indicate that when time delay be τlWhen impulse function；
J indicates the unit of imaginary number；
When local positive and negative array element is connect with a circulator respectively, be equivalent to and accessed a new channel, will before
It is established to carry out convolution for the Equivalent Base-Band model of the main radio-frequency channel of positive and negative array element and the channel of circulator, obtain circulator
The new expression formula of channel, it is specific as follows：
Wherein：
* convolution is indicated；
εabIndicate the time delay (ab ∈ { 12,13,23 }) of the port a to port b from the circulator of positive array element；
Indicate the time delay (ab ∈ { 12,13,23 }) of the port a to port b from the circulator of negative array element；
kab(t-εab) indicate from the amplitude response of the port a to port b of the circulator of positive array element (ab ∈ 12,13,
23})；
Indicate from the amplitude response of the port a to port b of the circulator of negative array element (ab ∈ 12,13,
23})；
ωab(t-εab) indicate phase shift (ab ∈ { 12,13,23 }) from the port a to port b of the circulator of positive array element；
Indicate the phase shift (ab ∈ { 12,13,23 }) of the port a to port b from the circulator of negative array element；
hn,p(t-ηn,p) indicate that the pulse of the wireless channel circulator from the circulator of negative array element to positive array element is rung
It answers, ηn,pIt is its time delay；
hp,n(t-ηp,n) indicate that the pulse of the wireless channel circulator from the circulator of positive array element to negative array element is rung
It answers, ηp,nIt is its time delay.
Then, it on the basis of single pair idol array element Equivalent Base-Band model, establishes for the main radio frequency of the multipair even array element of single antenna
The Equivalent Base-Band model in channel is reference with i-th of antithesis array element, and the formula of the equivalent baseband model is specific as follows：
Wherein：
Ii,p(t) impulse response of the main radio-frequency channel of positive array element in i-th of antithesis array element is indicated；
Ii,n(t) impulse response of the main radio-frequency channel of negative array element in i-th of antithesis array element is indicated；
Formula indicates the impulse response in positive array element self-interference channel in i-th of antithesis array element；
Formula indicates the arteries and veins of the mutual interfering channel between positive array element and other I-1 positive array elements in i-th of antithesis array element
Punching response；
Formula indicates the pulse of the mutual interfering channel between positive array element and other I negative array elements in i-th of antithesis array element
Response；
Formula indicates to bear the impulse response in array element self-interference channel in i-th of antithesis array element；
Formula indicates to bear the arteries and veins of the mutual interfering channel between array element and other I-1 negative array elements in i-th of antithesis array element
Punching response；
Formula indicates to bear the pulse of the mutual interfering channel between array element and other I positive array elements in i-th of antithesis array element
Response；
εi,abIt indicates from the port a of the circulator of i-th of positive array element to port b time delays (ab ∈ { 12,13,23 })；
It indicates from the port a of the circulator of i-th of negative array element to port b time delays (ab ∈ { 12,13,23 })；
εj,abIt indicates from the port a of the circulator of j-th of positive array element to port b time delays (ab ∈ { 12,13,23 })；
It indicates from the port a of the circulator of j-th of negative array element to port b time delays (ab ∈ { 12,13,23 })；
al(t-τl) indicate the amplitude response in l paths；
θl(t-τl) indicate the phase shift in l paths；
ki,ab(t-εi,ab) indicate from the amplitude response of the port a to port b of the circulator of i-th of positive array element (ab ∈ 12,
13,23})；
Indicate from the amplitude response of the port a to port b of the circulator of i-th of negative array element (ab ∈ 12,
13,23})；
kj,ab(t-εj,ab) indicate from the amplitude response of the port a to port b of the circulator of j-th of positive array element (ab ∈ 12,
13,23})；
Indicate from the amplitude response of the port a to port b of the circulator of j-th of negative array element (ab ∈ 12,
13,23})；
ωi,ab(t-εi,ab) indicate phase shift from the port a to port b of the circulator of i-th of positive array element；
Indicate the phase shift of the port a to port b from the circulator of i-th of negative array element；
ωj,ab(t-εj,ab) indicate phase shift from the port a to port b of the circulator of j-th of positive array element；
Indicate the phase shift of the port a to port b from the circulator of j-th of negative array element；
hjp,ip(t-ηjp,ip) indicate from the circulator of j-th of positive array element to the circulator of i-th of positive array element it is wireless
The impulse response of channel, ηjp,ipIt is its time delay；
hjn,ip(t-ηjn,ip) indicate from the circulator of j-th of negative array element to the circulator of i-th of positive array element it is wireless
The impulse response of channel, ηjn,ipIt is its time delay；
hjn,in(t-ηjn,in) indicate from the circulator of j-th of negative array element to the circulator of i-th of negative array element it is wireless
The impulse response of channel, ηjn,inIt is its time delay；
hjp,in(t-ηjp,in) indicate from the circulator of j-th of positive array element to the circulator of i-th of negative array element it is wireless
The impulse response of channel, ηjp,inIt is its time delay.
Two, fractal structure is designed
The case where even array element multipair for single antenna, we have disposed I antithesis battle array on the geometry of Rectangle Fractal
Member.
Fig. 2 is the Rectangle Fractal structural schematic diagram of the multipair even array element of the single antenna of the present invention.
In ideal conditions, the positive array element in an antithesis array element and negative array element can ensure good orthogonality (just
Bearing array element distance is), and the mutual interference between different antithesis array elements is 0.
In order to facilitate understanding, Wo MenyongMultiple antithesis array elements are through dividing shape in the case of indicating the multipair even array element of single antenna
Output signal after Interference Cancellation,Expression formula is specific as follows：
Wherein：
yu(t) indicate that useful signal, x (t) indicate locally known interference signal, γi(t) it indicates from i antithesis array element
The channel impulse response between port 3, a are arrived in the port 2 of the circulator of positive and negative array elementl(t-τl) above formula has been given, θl(t-τl)
Above formula has been given；
Indicate the self-interference impulse response of the main radio-frequency channel of i-th of antithesis array element；
(and if only if i=j) indicates that the mutual disturbing pulse of the main radio-frequency channel of i-th of antithesis array element is rung
It answers；
Indicate that the homopolarity between j-th of positive (negative) array element and i-th of positive (negative) array element (is all
Positive array element is all negative array element) mutually disturbing pulse response；
Indicate heteropolar mutually dry between j-th of positive (negative) array element and i-th of negative (just) array element
Disturb impulse response；
What μ was indicated is fractal coefficient.
By the analysis of above-mentioned formula it is understood that：Fractal structure is mainly the mutual interference offset between different antithesis array elements,
So we need to acquire suitable nonnegative number μ to prove that fractal structure can offset different antithesis array elements under the error of permission
Between mutual interference.
According to narration above it is understood that：When antithesis array element is uniformly distributed on Rectangle Fractal, between antithesis array element
Mutual interference cancel out each other, μ=0 at this time.
We analyze antithesis array element the uneven distribution on Rectangle Fractal the case where below.
The jamming power that we distribute to each array element is all PT, then the reception that can obtain i-th of antithesis array element is mutual
Jamming power Pi,rFor：
Wherein：
Indicate j-th of positive (negative) array element to i-th of positive (negative) array element distance.
In Rectangle Fractal structure, because in the presence ofAndPass
System, so the mutual jamming power P between the multipair even array element of single antennarFor：
According to above-mentioned formula it can be seen that：The fractal structure of rectangle can offset heteropolar mutually dry between different antithesis array elements
It disturbs.
Therefore,It can be write as following form：
In view of fractal coefficient is nonnegative number, so fractal coefficient μ can be expressed as：
It can be seen that by μ expression formulas：Work as satisfactionCondition when, can theoretically offset different antithesis
Mutual interference between array element.
In the present embodiment, we set mutual the interfering signal power nearly 60dB, Wo Mentong for coming from other antithesis array elements
Heteropolar mutual interference between different antithesis array elements can be offset by crossing Rectangle Fractal structure, so making to get by Rectangle Fractal structure
It is mutually interfered from the homopolarity in other antithesis array elements, simulation result is as shown in Figure 3.
As shown in Figure 3：It is handled through excessive shape counteracting, the power for coming from the mutual interference signal of other antithesis array elements can be with
The reduction of μ and reduce, close to uniform fractals (μ=0), mutual interference signal can shape in the position of corresponding frequencies
At very deep null.
It should be noted that the invention is not limited in any way for above-described embodiment, it is all to use equivalent replacement or equivalent change
The technical solution that the mode changed is obtained, all falls in protection scope of the present invention.
Claims (1)
1. eliminating the method mutually interfered between multipair even array element in single antenna full-duplex communication, which is characterized in that including following step
Suddenly：
One, the Equivalent Base-Band model for the main radio-frequency channel of the multipair even array element of single antenna is established
First, the Equivalent Base-Band model for the main radio-frequency channel of single antenna single pair idol array element, the public affairs of the equivalent baseband model are established
Formula is specific as follows：
Wherein：
Ip(t) impulse response of the positive main radio-frequency channel of array element is indicated；
In(t) impulse response of the negative main radio-frequency channel of array element is indicated；
L indicates the multipath number in multipath channel；
al(t) amplitude response in the paths l is indicated；
θl(t) phase shift in the paths l is indicated；
τlIndicate the time delay in the paths l；
δ(t-τl) indicate that when time delay be τlWhen impulse function；
J indicates the unit of imaginary number；
The channel of preceding established Equivalent Base-Band model and circulator for the main radio-frequency channel of positive and negative array element is subjected to convolution, is obtained
The expression formula new to the channel of circulator, it is specific as follows：
Wherein：
* convolution is indicated；
εabIndicate the time delay (ab ∈ { 12,13,23 }) of the port a to port b from the circulator of positive array element；
Indicate the time delay (ab ∈ { 12,13,23 }) of the port a to port b from the circulator of negative array element；
kab(t-εab) indicate amplitude response (ab ∈ { 12,13,23 }) from the port a to port b of the circulator of positive array element；
Indicate the amplitude response (ab ∈ { 12,13,23 }) of the port a to port b from the circulator of negative array element；
ωab(t-εab) indicate phase shift (ab ∈ { 12,13,23 }) from the port a to port b of the circulator of positive array element；
Indicate the phase shift (ab ∈ { 12,13,23 }) of the port a to port b from the circulator of negative array element；
hn,p(t-ηn,p) indicate the impulse response of wireless channel circulator from the circulator of negative array element to positive array element,
ηn,pIt is its time delay；
hp,n(t-ηp,n) indicate the impulse response of wireless channel circulator from the circulator of positive array element to negative array element,
ηp,nIt is its time delay；
Then, it on the basis of single pair idol array element Equivalent Base-Band model, establishes for the main radio-frequency channel of the multipair even array element of single antenna
Equivalent Base-Band model, be reference with i-th antithesis array element, the formula of the equivalent baseband model is specific as follows：
Wherein：
Ii,p(t) impulse response of the main radio-frequency channel of positive array element in i-th of antithesis array element is indicated；
Ii,n(t) impulse response of the main radio-frequency channel of negative array element in i-th of antithesis array element is indicated；
Formula indicates the impulse response in positive array element self-interference channel in i-th of antithesis array element；
Formula indicates that the pulse of the mutual interfering channel between positive array element and other I-1 positive array elements in i-th of antithesis array element is rung
It answers；
Formula indicates the impulse response of the mutual interfering channel between positive array element and other I negative array elements in i-th of antithesis array element；
Formula indicates to bear the impulse response in array element self-interference channel in i-th of antithesis array element；
Formula indicates that the pulse that the mutual interfering channel between array element and other I-1 negative array elements is born in i-th of antithesis array element is rung
It answers；
Formula indicates to bear the impulse response of the mutual interfering channel between array element and other I positive array elements in i-th of antithesis array element；
* convolution is indicated；
L indicates the multipath number in multipath channel；
I indicates the number of antithesis array element；
τlIndicate the time delay in the paths l；
εi,abIt indicates from the port a of the circulator of i-th of positive array element to port b time delays (ab ∈ { 12,13,23 })；
It indicates from the port a of the circulator of i-th of negative array element to port b time delays (ab ∈ { 12,13,23 })；
εj,abIt indicates from the port a of the circulator of j-th of positive array element to port b time delays (ab ∈ { 12,13,23 })；
It indicates from the port a of the circulator of j-th of negative array element to port b time delays (ab ∈ { 12,13,23 })；
al(t-τl) indicate the amplitude response in l paths；
θl(t-τl) indicate the phase shift in l paths；
ki,ab(t-εi,ab) indicate from the amplitude response of the port a to port b of the circulator of i-th of positive array element (ab ∈ 12,13,
23})；
Indicate from the amplitude response of the port a to port b of the circulator of i-th of negative array element (ab ∈ 12,13,
23})；
kj,ab(t-εj,ab) indicate from the amplitude response of the port a to port b of the circulator of j-th of positive array element (ab ∈ 12,13,
23})；
Indicate from the amplitude response of the port a to port b of the circulator of j-th of negative array element (ab ∈ 12,13,
23})；
ωi,ab(t-εi,ab) indicate phase shift from the port a to port b of the circulator of i-th of positive array element；
Indicate the phase shift of the port a to port b from the circulator of i-th of negative array element；
ωj,ab(t-εj,ab) indicate phase shift from the port a to port b of the circulator of j-th of positive array element；
Indicate the phase shift of the port a to port b from the circulator of j-th of negative array element；
hjp,ip(t-ηjp,ip) indicate from the circulator of j-th of positive array element to the circulator of i-th of positive array element wireless channel
Impulse response, ηjp,ipIt is its time delay；
hjn,ip(t-ηjn,ip) indicate from the circulator of j-th of negative array element to the circulator of i-th of positive array element wireless channel
Impulse response, ηjn,ipIt is its time delay；
hjn,in(t-ηjn,in) indicate from the circulator of j-th of negative array element to the circulator of i-th of negative array element wireless channel
Impulse response, ηjn,inIt is its time delay；
hjp,in(t-ηjp,in) indicate from the circulator of j-th of positive array element to the circulator of i-th of negative array element wireless channel
Impulse response, ηjp,inIt is its time delay；
Two, fractal structure is designed
Using Rectangle Fractal, I antithesis array element is disposed on the geometry of Rectangle Fractal, in ideal conditions, one right
Positive array element and negative array element in even array element can ensure that the mutual interference between good orthogonality and different antithesis array elements is 0, I
UseOutput signal of multiple antithesis array elements after dividing shape Interference Cancellation in the case of the multipair even array element of expression single antenna,Expression formula is specific as follows：
Wherein：
yu(t) indicate that useful signal, x (t) indicate locally known interference signal, γi(t) indicate positive and negative from i antithesis array element
The channel impulse response between port 3 is arrived in the port 2 of the circulator of array element；
Indicate the self-interference impulse response of the main radio-frequency channel of i-th of antithesis array element；
And if only if i=j, the mutual disturbing pulse response of the main radio-frequency channel of i-th of antithesis array element is indicated；
Indicate that the mutual disturbing pulse of homopolarity between j-th of positive/negative array element and i-th of positive/negative array element is rung
It answers；
Indicate that the heteropolar mutual disturbing pulse between j-th of positive/negative array element and i-th of positive negative array element is rung
It answers；
What μ was indicated is fractal coefficient；
When antithesis array element is uniformly distributed on Rectangle Fractal, μ=0；
When antithesis array element uneven distribution on Rectangle Fractal, the computational methods of μ are as follows：
The jamming power that we distribute to each array element is all PT, then work(is mutually interfered in the reception that can obtain i-th of antithesis array element
Rate Pi,rFor：
Wherein：
Indicate j-th of positive/negative array element to i-th of positive/negative array element distance；
In Rectangle Fractal structure, because in the presence ofAndRelationship,
So the mutual jamming power P between the multipair even array element of single antennarFor：
The fractal structure of rectangle can offset the heteropolar mutual interference between different antithesis array elements, thereforeIt can be write as following
Form：
In view of fractal coefficient is nonnegative number, so fractal coefficient μ can be expressed as：
Work as satisfactionCondition when, can theoretically offset the mutual interference between different antithesis array elements.
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| CN104539341A (en) * | 2014-12-26 | 2015-04-22 | 西安电子科技大学 | Active echo self-interference suppression scheme of wireless broadband multi-antenna MIMO full-duplex system |
| CN106357570A (en) * | 2016-08-26 | 2017-01-25 | 西安电子科技大学 | A Time Division Interference Alignment Method for Full-duplex Base Station Cellular Network |
| CN106604300A (en) * | 2016-11-10 | 2017-04-26 | 北京邮电大学 | Small cell base station self-energy-supply self-back-transmission method based on technologies of full duplex and large-scale antennas |
| CN107592134A (en) * | 2017-09-19 | 2018-01-16 | 电子科技大学 | A kind of multi-tap towards co-channel full duplex simultaneously simulates self-interference cancellation method |
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| CN104539341A (en) * | 2014-12-26 | 2015-04-22 | 西安电子科技大学 | Active echo self-interference suppression scheme of wireless broadband multi-antenna MIMO full-duplex system |
| CN106357570A (en) * | 2016-08-26 | 2017-01-25 | 西安电子科技大学 | A Time Division Interference Alignment Method for Full-duplex Base Station Cellular Network |
| CN106604300A (en) * | 2016-11-10 | 2017-04-26 | 北京邮电大学 | Small cell base station self-energy-supply self-back-transmission method based on technologies of full duplex and large-scale antennas |
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