CN103475396A - Method, device and system for acquiring useful signal in full-duplex communication - Google Patents
Method, device and system for acquiring useful signal in full-duplex communication Download PDFInfo
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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
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- 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
- 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
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- 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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- 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
- H04B7/0413—MIMO systems
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- H—ELECTRICITY
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- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
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- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
- H04B7/0615—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal
- H04B7/0617—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission of weighted versions of same signal for beam forming
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Abstract
The invention is applicable to the technical field of communication and provides a method and a device for acquiring a useful signal in full-duplex communication and a full-duplex communication system. The method comprises the following steps: acquiring a base vector and the number of dimensions of a null space of a self-interference channel matrix according to the self-interference channel matrix between a local transmitting antenna and a local receiving antenna in full-duplex communication; acquiring transmitting data flow transmitted in the null space of the self-interference channel matrix and the number of transmitting data flows transmitted in a row vector space of the self-interference channel matrix according to the base vector and the number of dimensions of the null space as well as channel condition and service information; and acquiring a locally-received useful signal according to the transmitting data flow transmitted in the null space of the self-interference channel matrix, a transmission pre-coding matrix function and the self-interference channel matrix when the number of the transmitting data flows transmitted in the row vector space of the self-interference channel matrix is not equal to 0, thereby achieving the purpose of acquiring a useful signal more flexibly.
Description
Technical field
The invention belongs to communication technical field, relate in particular to acquisition methods, the Apparatus and system of useful signal in a kind of full-duplex communication.
Background technology
Mobile network in operator, a plurality of user terminals in base station and coverage communicate.Communicating by letter between base station and terminal is two-way, and base station is called downlink communication to the process of terminal transmitted signal, and terminal is called uplink communication to the process of base station transmitted signal.The full duplex technology is transmitted when on identical running time-frequency resource, realizing up-downgoing, and its spectrum efficiency is single work and semiduplex twice.Existing full duplex technology transceiver transmit and receive or use different antennas and radio-frequency channel because also do not have the experimental prototype proof to use same antenna or radio-frequency channel can arrive the result of requirement at present.The problem that the full duplex Technology Need solves is that we call self-interference to the interference transmitted to received signal of the machine if process the interference transmitted to received signal of same transceiver, and also research concentrates on how to carry out the self-interference deletion.Existing self-interference deleting technique mainly contains based on reference antenna interference delete technology and based on the vector space interference avoidance technique.
As shown in Figure 1, full-duplex communication terminal based in reference antenna interference delete technology comprises local transmitting antenna, local reception antenna and local reference antenna, by the phase and magnitude correcting network, adjust phase place and the amplitude of the high reject signal from local transmitting antenna that local reference antenna receives, make it the amplitude of the high reject signal from local transmitting antenna and the phase place that receive with the local reception antenna identical as far as possible, like this, by interference cancellation, process, just can balance out the high reject signal from local transmitting antenna that the local reception antenna receives, and reservation is from the useful signal of Correspondent Node transmitting antenna.Yet, the self-interference signal that should come the reconstruct reception antenna to receive based on the special reference antenna of reference antenna interference delete Technology Need, and the quantity of reference antenna is subject to the restriction of data fluxion or the title transmitting data fluxion of the machine emission.Such as full duplex letter is confidential maximum in the emission fluxion, be also that the transmitting data fluxion also can be used while equaling number of transmission antennas, need the self-interference signal at the whole reception antennas of the reference antenna guarantee reconstruct place of equivalent amount.
Full-duplex communication machine based on the vector space interference avoidance technique transmits on the kernel at the self-interference channel, and interference signal space and reception signal space be kernel each other, thereby reduces as far as possible the self-interference intensity at reception antenna place.The number of this specification requirement transmitting antenna is not less than number and another letter machine reception antenna number sum of the machine reception antenna, for example supposes that number of transmit antennas is 2M, and reception antenna number local and opposite end letter machine is all M.Local transmitting antenna is H to the channel matrix of local reception antenna
1,1, according to the character of kernel mapping, the pre-coding matrix of local emission is P so
1,1need to satisfy condition: H
1,1p
1,1=0.Yet the data fluxion that should launch on the different channels direction in space based on the machine in the vector space interference avoidance technique can not be greater than the order in self-interference channel zero space, otherwise receiving terminal will be received very strong self-interference signal.
Thereby, from above-mentioned explanation, can find out, all there is restrictive condition in the existing self-interference deleting technique be applied in full-duplex communication, such as the quantity of reference antenna is subject to the restriction of the data fluxion of the machine emission, the data fluxion that perhaps the machine is launched on the different channels direction in space can not be greater than the order in self-interference channel zero space etc., making the delet method underaction of self-interference signal, effectively, is also the acquisition methods underaction, effective etc. of useful signal.
Summary of the invention
The purpose of the embodiment of the present invention is to provide acquisition methods, device and the full duplex communication system of useful signal in a kind of full-duplex communication, be intended to solve because existing self-interference signal deleting technique exists flexibility, the deficient validity, cause the acquisition methods underaction of useful signal, effective problem.
The embodiment of the present invention is achieved in that the acquisition methods of useful signal in a kind of full-duplex communication, and described method comprises:
According to the self-interference channel matrix between local transmitting antenna in full-duplex communication and local reception antenna, be obtained from base vector and the dimension of the kernel of interference channel matrix;
According to base vector and the dimension of described kernel, and channel conditions and traffic information, the data streams of transmitting and the transmitting data fluxion of transmitting obtained in the capable vector space of described interference channel matrix in the kernel of described self-interference channel matrix;
When the transmitting data fluxion of transmitting in the capable vector space at described interference channel matrix is non-vanishing, according to the described data streams of transmitting, emission pre-coding matrix function and described self-interference channel matrix, obtain the useful signal of described local reception in the kernel of described self-interference channel matrix.
Another purpose of the embodiment of the present invention is to provide the deriving means of useful signal in a kind of full-duplex communication, and described device comprises:
The kernel information acquisition unit, for the self-interference channel matrix according between the local transmitting antenna of full-duplex communication and local reception antenna, obtain base vector and the dimension of the kernel of described self-interference channel matrix;
The data flow acquiring unit, for base vector and the dimension according to described kernel, and channel conditions and traffic information, obtain the data streams of transmitting and the transmitting data fluxion of transmitting in the capable vector space of described interference channel matrix in the kernel of described self-interference channel matrix; And
The useful signal acquiring unit, when non-vanishing for the transmitting data fluxion of transmitting when the capable vector space at described interference channel matrix, according to the described data streams of transmitting, emission pre-coding matrix function and described self-interference channel matrix, obtain the useful signal of described local reception in the kernel of described self-interference channel matrix.
Another purpose of the embodiment of the present invention is to provide a kind of full duplex communication system that comprises the deriving means of useful signal in above-mentioned full-duplex communication.
The embodiment of the present invention is by the self-interference channel matrix between local transmitting antenna in full-duplex communication and local reception antenna, be obtained from base vector and the dimension of the kernel of interference channel matrix, base vector and dimension according to this kernel, and channel conditions and traffic information, obtain the data streams of transmitting and the transmitting data fluxion of transmitting in the capable vector space of this interference channel matrix in the kernel of this self-interference channel matrix, while having realized that the transmitting data fluxion of transmitting is non-vanishing in the capable vector space of this interference channel matrix, can be according to the data streams of transmitting in the kernel at this self-interference channel matrix, emission pre-coding matrix function and this self-interference channel matrix, effectively obtain the useful signal of local reception, solved because there is flexibility in existing self-interference signal deleting technique, the deficient validity, the acquisition methods underaction that causes useful signal, effective problem, improved the flexibility of obtaining useful signal, validity etc.
The accompanying drawing explanation
Fig. 1 is the theory diagram based on reference antenna interference delete technology in prior art;
Fig. 2 is the realization flow figure of the acquisition methods of useful signal in the full-duplex communication that provides of first embodiment of the invention;
Fig. 3 is the structure chart of the deriving means of useful signal in the full-duplex communication that provides of second embodiment of the invention.
Embodiment
In order to make purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein, only in order to explain the present invention, is not intended to limit the present invention.
Base vector and the dimension of the kernel of the embodiment of the present invention by being obtained from the interference channel matrix, and then according to base vector and the dimension of this kernel, and channel conditions and traffic information, determine the data streams of transmitting and the transmitting data fluxion of transmitting in the capable vector space of this interference channel matrix in the kernel of this self-interference channel matrix, when the data fluxion that judgement is transmitted in the capable vector space of this self-interference channel matrix is non-vanishing, the reference antenna number is set, determine the component of reception signal in the capable vector space of self-interference channel matrix of local reference antenna, and the final reception signal in conjunction with this reception antenna, obtain the useful signal that local reception is arrived, thereby can be according to the magnitude relationship between the dimension of the kernel of transmitting data fluxion and this self-interference channel matrix, jointly solved self-interference problem in full-duplex communication in conjunction with reference antenna interference delete and vector space interference avoidance technique.
Below in conjunction with specific embodiment, specific implementation of the present invention is described in detail:
embodiment mono-:
Fig. 2 shows the realization flow of the acquisition methods of useful signal in the full-duplex communication that first embodiment of the invention provides, and details are as follows:
In step S201, according to the self-interference channel matrix between local transmitting antenna in full-duplex communication and local reception antenna, be obtained from base vector and the dimension of the kernel of interference channel matrix.
In the full-duplex communication process, that supposes full duplex letter machine is provided with n transmitting antenna at all in advance, r is reception antenna at all, so local transmitting antenna is r*n to the dimension of the self-interference channel matrix Jr (t) of local reception antenna, Jr (t) also means that this transmitting antenna is to the channel response matrix function of this reception antenna, in this Jr (t) element of the capable j row of i represent j at all transmitting antenna to the i channel response between reception antenna at all.Now, the emission signal vector space dimensionality is n, if the order of Jr (t) is r, the dimension of vector space is r at once, the kernel dimension of self-interference channel matrix is (n-r) so, also can know that this transmitting data fluxion transmitted is s, s is not more than n, the orthogonal vectors that the base vector of kernel is (n-r) individual n dimension.
In step S202, base vector and dimension according to this kernel, and channel conditions and traffic information, obtain the data streams of transmitting and the transmitting data fluxion of transmitting in the capable vector space of this interference channel matrix in the kernel of this self-interference channel matrix.
Wherein, this channel condition comprises two transmission channel matrixes between communication letter machine, and/or the direction in space of other letter machine interference signals of periphery etc., determine under this channel matrix condition the emission pre-coding matrix function that the data streams of local transmitting antenna is corresponding according to the channel matrix between communicating pair; This business information comprises data streams and the delay requirement of data service, according to this business information, can select the data flow of transmission and obtain corresponding pre-coding matrix function, obtain thus the transmitting data fluxion of transmitting in the capable vector space of self-interference channel matrix, also can obtain the data streams of transmitting in the kernel of this self-interference channel matrix.And the data fluxion of the different channels direction in space transmitted in the kernel of this interference channel matrix emission is not more than the dimension of the kernel of this self-interference channel matrix.
In step S203, when the transmitting data fluxion of transmitting in the capable vector space at this interference channel matrix is non-vanishing, according to the data streams of transmitting in the kernel at this self-interference channel matrix, emission pre-coding matrix function and this self-interference channel matrix, obtain the useful signal of this local reception.
Particularly, when the transmitting data fluxion of transmitting in the capable vector space at this interference channel matrix is non-vanishing, local reference antenna number is set is not less than the data fluxion of transmitting in the capable vector space of self-interference channel matrix, and can obtain and drop on the component of emission pre-coding matrix function in the capable vector space of this self-interference channel matrix, and obtain the component of emission pre-coding matrix function in this self-interference channel matrix zero vector space.
In specific implementation process, the transmitting data fluxion of transmitting in the capable vector space at this interference channel matrix is zero, all self-interference signals can project on the kernel of self-interference channel matrix, to avoid its impact on the local reception antenna, specifically can be according to default based on the vector space interference avoidance technique, reception antenna does not almost receive the self-interference signal dropped in this self-interference channel matrix kernel, thereby the useful signal of local reception is the reception signal of local reception antenna.
While dropping in the capable vector space of self-interference channel when transmitting, produce self-interference signal in other words in the capable vector space of self-interference channel matrix, the self-interference signal dropped on outside kernel is called to the leakage interference, the data flow that this leakage comprises in disturbing is leak data stream, at least needing s ' root reference antenna to come reconstruct to reveal disturbs, wherein s ', for to drop on the transmitting data fluxion in the capable vector space of this self-interference channel matrix, is also that the quantity of reference antenna is no less than the quantity s ' that leak data flows.
Wherein, step S203 specifically comprises the following steps:
Obtain emission pre-coding matrix function P
x(t) the component P in this self-interference channel matrix zero vector space
⊥ x(t);
According to the data streams X transmitted in the kernel at this self-interference channel matrix
⊥(t), the component P of emission pre-coding matrix function in this self-interference channel matrix kernel
⊥ x(t) and this this locality transmitting antenna to the channel response matrix function Jref (t) of this this locality reference antenna, obtain the component Y ' ref (t) of reception signal in the capable vector space of this self-interference channel matrix of local reference antenna;
Component Y ' ref (t), this self-interference channel matrix Jr (t) according to the reception signal of this this locality reference antenna in the capable vector space of this self-interference channel matrix and this this locality transmitting antenna, to the channel response matrix function Jref (t) of this this locality reference antenna, obtain the useful signal of this local reception.
In embodiments of the present invention, suppose that the transmitting data fluxion dropped in the capable vector space of this self-interference channel matrix is non-vanishing, be made as s '.Because the self-interference in self-interference channel matrix kernel is very little, only need to consider drop on the self-interference signal in the capable vector space of self-interference channel matrix, obtain with this and drop on the pre-coding matrix function P that self-interference signal in self-interference channel matrix kernel is corresponding
⊥ x(t), if need to delete the self-interference in kernel, can the interference avoidance technique based on vector space be processed, the embodiment of the present invention is ignored the self-interference in kernel, with the self-interference deletion action of more effectively being gone in vector space.
Particularly, obtain relation according to the component of reception signal in the capable vector space of self-interference channel matrix of following default reference antenna, obtain the component Y ' ref (t) of reception signal in the capable vector space of this self-interference channel matrix of local reference antenna:
Wherein, Yref (t) means the reception signal of this this locality reference antenna, and Jref (t) means the channel response matrix function of this this locality transmitting antenna to this this locality reference antenna.
Further, according to the useful signal of following default reception antenna, obtain relation, obtain the useful signal Y (t) of this local reception:
Wherein, Yr (t) means the reception signal of this local reception antenna, Jref
1(t) mean this Jref (t) is carried out to the value after inverse operation, Jr (t) means this self-interference channel matrix or claims this this locality transmitting antenna to connect the channel response matrix function of local receipts antenna to this.
In specific implementation process, in the situation that do not consider the additive noise that reception antenna is received, the reception signal Yr (t) of this reception antenna that communication is local is except receiving the signal sent from Correspondent Node, due to the near field Space Coupling, also can receive the coupled signal that local transmitting antenna sends, this coupled signal can pass through
calculating is obtained, and Px (t) means the emission pre-coding matrix function of channel response matrix function, and X (t) means the data streams of this transmitting antenna, and dimension is n*1.And in embodiments of the present invention, do not consider the self-interference signal in self-interference channel matrix kernel, need to obtain the component of reception signal in the capable vector space of described self-interference channel matrix of local reference antenna, according to the component P of emission pre-coding matrix function in described self-interference channel matrix kernel
⊥x (t), the data streams X transmitted in the kernel of this self-interference channel matrix
⊥(t) and this this locality transmitting antenna to the channel response matrix function Jref (t) of this this locality reference antenna, thereby can utilize above-mentioned formula (1) to obtain the component Y ' ref (t) of reception signal in the capable vector space of this self-interference channel matrix of this this locality reference antenna.
Further, component Y ' the ref (t) of reception signal in the capable vector space of this self-interference channel matrix by local reference antenna, this this locality transmitting antenna is to the channel response matrix function Jref (t) of this this locality reference antenna, this this locality transmitting antenna meets the local channel response matrix function Jr (t) that receives antenna to this, and the reception signal of this this locality antenna, obtain in conjunction with above-mentioned formula (2) the useful signal Y (t) that local reception is arrived.
Wherein, that supposes full duplex letter machine is provided with n transmitting antenna at all in advance, r is reception antenna at all, so local transmitting antenna is r*n to the dimension of the self-interference channel matrix Jr (t) of local reception antenna, because the transmitting data fluxion dropped in the capable vector space of this self-interference channel matrix is s ', self-interference needed reference antenna number in reconstruct reception antenna place is also s ' so, and the data fluxion that hypothesis drops in this self-interference channel matrix kernel is s ", dimension s ' the * 1 of Y ' ref (t), the dimension of Yref (t) is s ' * 1, the dimension of Jref (t) is s ' * n, P
⊥the dimension of x (t) is n*s ", X
⊥(t) dimension is s " * 1, the dimension of Yr (t) is r*1.If this matrix function Jref (t) no enough row full rank condition, can pass through the suitably position of adjustment reference antenna in addition, to upgrade this Jref (t), until meet row full rank condition.
In embodiments of the present invention, in this full-duplex communication, the acquisition methods of useful signal has been realized the flexible self-interference deleting technique of being correlated with of selecting of the data fluxion of transmitting in the capable vector space according to the self-interference channel matrix, particularly, the data fluxion of transmitting in the capable vector space of this self-interference channel matrix is not 0 o'clock, can solve the self-interference problem at local reception antenna place according to the existing interference delete technology based on reference antenna, now, drop on the component in the capable vector space of this self-interference channel matrix according to emission pre-coding matrix function, the data streams of transmitting in the kernel of this self-interference channel matrix etc., obtain the useful signal in this reception signal, also make the number at local reference antenna be not less than under the condition of the transmitting data fluxion in dropping on the capable vector space of self-interference channel matrix, can adjust flexibly number according to actual conditions, and the transmitting data fluxion can be greater than the dimension of self-interference channel matrix kernel etc., finally improved the self-interference deleting technique, flexibility and the validity of the technology of obtaining of useful signal.
One of ordinary skill in the art will appreciate that all or part of step realized in above-described embodiment method is to come the hardware that instruction is relevant to complete by program, described program can be stored in a computer read/write memory medium, described storage medium, as ROM/RAM, disk, CD etc.
embodiment bis-:
Fig. 3 shows the structure of the deriving means of useful signal in the full-duplex communication that second embodiment of the invention provides, and for convenience of explanation, only shows the part relevant to the embodiment of the present invention.
In this full-duplex communication the deriving means of useful signal can full duplex communication system in, in this full-duplex communication, the deriving means of useful signal comprises kernel information acquisition unit 31, data flow acquiring unit 32 and useful signal acquiring unit 33, wherein:
Kernel dimension acquiring unit 31, for the self-interference channel matrix according between the local transmitting antenna of full-duplex communication and local reception antenna, obtain base vector and the dimension of the kernel of this self-interference channel matrix.
In full duplex communication system, if this locality of full duplex letter machine is provided with the n transmit antennas, r root reception antenna in advance, the emission signal vector space dimensionality is n so, the kernel dimension of self-interference channel matrix is (n-r), and the transmitting data fluxion transmitted of obtaining is s, and s is not more than n.Suppose that a full duplex letter machine comprises 4 transmit antennas, 3 reception antennas, the dimension that is obtained from the kernel of interference channel matrix is 1, transmitting antenna is 3*4 to the dimension of the self-interference channel matrix Jr (t) of reception antenna, Jr (t) also means the channel response matrix function of this transmitting antenna to this reception antenna, suppose that this Jr (t) is impulse function on time domain, and be constant function on communication channel, can mean with Jr.
Data flow acquiring unit 32, for base vector and the dimension according to this kernel, and channel conditions and traffic information, obtain the data streams of transmitting and the transmitting data fluxion of transmitting in the capable vector space of this interference channel matrix in the kernel of this self-interference channel matrix.
Useful signal acquiring unit 33, when non-vanishing for the transmitting data fluxion of transmitting when the capable vector space at this interference channel matrix, according to the data streams of transmitting in the kernel at this self-interference channel matrix, emission pre-coding matrix function and this self-interference channel matrix, obtain the useful signal of this local reception.
In embodiments of the present invention, this useful signal acquiring unit 33 specifically comprises:
Matrix component acquiring unit 331, for obtaining the component P of emission pre-coding matrix function at this self-interference channel matrix zero vector space
⊥x (t);
Reference component acquiring unit 332, the data streams X transmitted for the kernel according at this self-interference channel matrix
⊥(t), the component P of emission pre-coding matrix function in this self-interference channel matrix kernel
⊥ x(t) and this this locality transmitting antenna to the channel response matrix function Jref (t) of this this locality reference antenna, obtain the component Y ' ref (t) of reception signal in the capable vector space of this self-interference channel matrix of local reference antenna; And
Useful signal obtains subelement 333, for according to the reception signal of this this locality reference antenna at component Y ' ref (t), this self-interference channel matrix Jr (t) of the capable vector space of this self-interference channel matrix and this this locality transmitting antenna to the channel response matrix function Jref (t) of this this locality reference antenna, obtain the useful signal of this local reception.
Wherein, this reference component acquiring unit 332 is specifically for according to above-mentioned formula (1), and obtain the component Y ' ref (t) of reception signal in the capable vector space of this self-interference channel matrix of local reference antenna: this useful signal obtains subelement 333 specifically for obtain the useful signal Y (t) of this local reception according to above-mentioned formula (2).
When the data streams in the capable vector space of self-interference channel matrix is zero, all self-interference signals can pass through projection on the kernel of self-interference channel matrix, to avoid its impact on the local reception antenna, particularly, can utilize disturb avoid unit according to default based on the vector space interference avoidance technique, self-interference signal drops in this self-interference channel matrix kernel, the reception signal that the useful signal of this local reception is this reception antenna.Perhaps, when the transmitting data fluxion of transmitting in the capable vector space at this interference channel matrix is zero, the reception signal that the useful signal of this local reception is this local reception antenna.
In embodiments of the present invention, comprise 4 transmit antennas with a full duplex letter machine, 3 reception antennas are example, the dimension of the kernel of this self-interference channel matrix is 1, when the transmitting data fluxion of transmitting in the capable vector space at this interference channel matrix is non-vanishing, utilizing reference antenna number setting unit that local reference antenna number is set is not less than this reference antenna number and is not less than this and drops on the transmitting data fluxion s ' in the capable vector space of this self-interference channel matrix, the quantity that is also reference antenna is no less than the quantity s ' that leak data flows, the emission pre-coding matrix corresponding with this Jr now obtained is Px.
Suppose that transmitting data fluxion s ' is 2, because the dimension of the kernel of self-interference channel matrix is 1, these 1 data can be banished in this kernel and transmitted, another data flow is placed in self-interference channel space row matrix vector space and transmits, only need can reconstruct reveal interfering data once the signal that reference antenna receives at all, to carry out interference delete.The matrix that now Px is 4*2, the column vector P of Px
⊥x drops on the vector of self-interference channel matrix kernel or is called the component of emission pre-coding matrix function Px in this self-interference channel matrix kernel, and dimension is 4*1, and the data flow of transmitting on this vector direction produces and disturbs the machine reception antenna hardly; Another column vector P of Px
|| xbe to drop on the vector of self-interference channel matrix row space or be called the component of emission pre-coding matrix function Px in the capable vector space of this self-interference channel matrix, the data flow of transmitting on this vector can produce and disturb the machine reception antenna.
The embodiment of the present invention provides a kind of kernel information acquisition unit 31 that comprises, the deriving means of useful signal in the full-duplex communication of data flow acquiring unit 32 and useful signal acquiring unit 33, solved because there is flexibility in existing self-interference signal deleting technique, the deficient validity, the acquisition methods underaction that causes useful signal, effective problem, reached the transmitting data fluxion of transmitting when non-vanishing in the capable vector space at this interference channel matrix, the reference antenna that some still can be set comes reconstruct to drop on the self-interference signal outside kernel, this self-interference signal is deleted, to obtain the purpose of useful signal, improved the flexibility of self-interference deleting technique, and when the transmitting data fluxion transmitted in judgement is not more than the dimension in self-interference channel zero space, the interference avoidance technique based on vector space of choice for use prior art neatly, thereby reduce as far as possible the self-interference intensity at reception antenna place.
The embodiment of the present invention is passed through according to the self-interference channel matrix between local number of transmit antennas in full-duplex communication and local reception antenna, obtain base vector and the dimension of the kernel of this self-interference channel matrix, and according to base vector and the dimension of this kernel, and channel conditions and traffic information, obtain the data streams of transmitting and the transmitting data fluxion of transmitting in the capable vector space of this interference channel matrix in the kernel of this self-interference channel matrix, when the transmitting data fluxion of transmitting in the capable vector space at this interference channel matrix is non-vanishing, according to this self-interference channel matrix, emission pre-coding matrix function and the data streams of transmitting in the kernel of this self-interference channel matrix, in conjunction with the reception signal of this local reception antenna and the reception signal of this this locality reference antenna, obtain the useful signal of this local reception, thereby can whether be zero according to the transmitting data fluxion of transmitting in the capable vector space of this self-interference channel matrix, jointly solve self-interference problem in full-duplex communication in conjunction with reference antenna interference delete and vector space interference avoidance technique, also improved the flexibility of dealing with problems.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, all any modifications of doing within the spirit and principles in the present invention, be equal to and replace and improvement etc., within all should being included in protection scope of the present invention.
Claims (12)
1. the acquisition methods of useful signal in a full-duplex communication, is characterized in that, described method comprises:
According to the self-interference channel matrix between local transmitting antenna in full-duplex communication and local reception antenna, be obtained from base vector and the dimension of the kernel of interference channel matrix;
According to base vector and the dimension of described kernel, and channel conditions and traffic information, the data streams of transmitting and the transmitting data fluxion of transmitting obtained in the capable vector space of described interference channel matrix in the kernel of described self-interference channel matrix;
When the transmitting data fluxion of transmitting in the capable vector space at described interference channel matrix is non-vanishing, according to the described data streams of transmitting, emission pre-coding matrix function and described self-interference channel matrix, obtain the useful signal of described local reception in the kernel of described self-interference channel matrix.
2. the method for claim 1, is characterized in that, described according to the described data streams of transmitting in the kernel of described self-interference channel matrix and emission pre-coding matrix function, the useful signal that obtains described local reception is specially:
Obtain the component P of emission pre-coding matrix function in described self-interference channel matrix zero vector space
⊥ x(t);
According to the data streams X transmitted in the kernel at described self-interference channel matrix
⊥(t), the component P of emission pre-coding matrix function in described self-interference channel matrix kernel
⊥ x(t) and described local transmitting antenna to the channel response matrix function Jref (t) of described local reference antenna, obtain the component Y ' ref (t) of reception signal in the capable vector space of described self-interference channel matrix of local reference antenna;
Component Y ' ref (t), described self-interference channel matrix Jr (t) according to the reception signal of described local reference antenna in the capable vector space of described self-interference channel matrix and described local transmitting antenna, to the channel response matrix function Jref (t) of described local reference antenna, obtain the useful signal of described local reception.
3. method as claimed in claim 2, is characterized in that, the data streams X that described basis is transmitted in the kernel of described self-interference channel matrix
⊥(t), the component P of emission pre-coding matrix function in described self-interference channel matrix kernel
⊥ x(t) and described local transmitting antenna to the channel response matrix function Jref (t) of described local reference antenna, the component Y ' ref (t) of reception signal in the capable vector space of described self-interference channel matrix that obtains local reference antenna is specially:
Obtain relation according to the component of reception signal in the capable vector space of self-interference channel matrix of following default reference antenna, obtain the component Y ' ref (t) of reception signal in the capable vector space of described self-interference channel matrix of local reference antenna:
Wherein, Yref (t) means the reception signal of described local reference antenna.
4. method as claimed in claim 3, it is characterized in that, component Y ' ref (t), the described self-interference channel matrix Jr (t) of the described signal of the reception according to described local reference antenna in the capable vector space of described self-interference channel matrix and described local transmitting antenna are to the channel response matrix function Jref (t) of described local reference antenna, and the useful signal that obtains described local reception is specially:
Obtain relation according to the useful signal of following default reception antenna, obtain the useful signal Y (t) of described local reception:
Wherein, Yr (t) means the reception signal of described local reception antenna, Jref
1(t) mean described Jref (t) is carried out to the value after inverse operation.
5. the method for claim 1, is characterized in that, described method also comprises:
When the transmitting data fluxion of transmitting in the capable vector space at described interference channel matrix is non-vanishing, local reference antenna number is set is not less than the described transmitting data fluxion of transmitting in the capable vector space of described self-interference channel matrix.
6. the method for claim 1, is characterized in that, described method also comprises:
When the transmitting data fluxion of transmitting in the capable vector space at described interference channel matrix is zero, the reception signal that the useful signal of described local reception is described local reception antenna.
7. the deriving means of useful signal in a full-duplex communication, is characterized in that, described device comprises:
The kernel information acquisition unit, for the self-interference channel matrix according between the local transmitting antenna of full-duplex communication and local reception antenna, obtain base vector and the dimension of the kernel of described self-interference channel matrix;
The data flow acquiring unit, for base vector and the dimension according to described kernel, and channel conditions and traffic information, obtain the data streams of transmitting and the transmitting data fluxion of transmitting in the capable vector space of described interference channel matrix in the kernel of described self-interference channel matrix; And
The useful signal acquiring unit, when non-vanishing for the transmitting data fluxion of transmitting when the capable vector space at described interference channel matrix, according to the described data streams of transmitting, emission pre-coding matrix function and described self-interference channel matrix, obtain the useful signal of described local reception in the kernel of described self-interference channel matrix.
8. device as claimed in claim 7, is characterized in that, described useful signal acquiring unit specifically comprises:
The matrix component acquiring unit, for obtaining the component P of emission pre-coding matrix function at described self-interference channel matrix zero vector space
⊥ x(t);
The reference component acquiring unit, the data streams X transmitted for the kernel according at described self-interference channel matrix
⊥(t), the component P of emission pre-coding matrix function in described self-interference channel matrix kernel
⊥ x(t) and described local transmitting antenna to the channel response matrix function Jref (t) of described local reference antenna, obtain the component Y ' ref (t) of reception signal in the capable vector space of described self-interference channel matrix of local reference antenna; And
Useful signal obtains subelement, arrive the channel response matrix function Jref (t) of described local reference antenna for the reception signal according to described local reference antenna at the component Y ' of the capable vector space of described self-interference channel matrix ref (t), described self-interference channel matrix Jr (t) and described local transmitting antenna, obtain the useful signal of described local reception.
9. device as claimed in claim 8, it is characterized in that, described reference component acquiring unit obtains relation specifically for the component of reception signal in the capable vector space of self-interference channel matrix of the reference antenna according to following default, obtains the component Y ' ref (t) of reception signal in the capable vector space of described self-interference channel matrix of local reference antenna:
Wherein, Yref (t) means the reception signal of described local reference antenna.
10. device as claimed in claim 9, is characterized in that, the useful signal that described useful signal obtains subelement following default reception antenna specifically for basis obtains relation, obtains the useful signal Y (t) of described local reception:
Wherein, Yr (t) means the reception signal of described local reception antenna, Jref
1(t) mean described Jref (t) is carried out to the value after inverse operation.
11. device as claimed in claim 7, is characterized in that, described device also comprises:
Reference antenna number setting unit, when non-vanishing for the transmitting data fluxion of transmitting when the capable vector space at described interference channel matrix, local reference antenna number be set be not less than the described transmitting data fluxion of transmitting in the capable vector space of described self-interference channel matrix.
12. a full duplex communication system, is characterized in that, described system comprises the deriving means of useful signal in the described full-duplex communication of claim 7 to 11 any one.
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| WO2022061513A1 (en) * | 2020-09-22 | 2022-03-31 | 华为技术有限公司 | Wireless communication method and apparatus |
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| CN111669206B (en) * | 2020-05-21 | 2021-04-06 | 中国联合网络通信集团有限公司 | Signal detection method and device |
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| CN103475396B (en) | 2017-02-01 |
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