CN113014296A - Self-interference suppression hybrid precoding method based on orthogonal matching pursuit in full-duplex millimeter wave bidirectional relay - Google Patents
Self-interference suppression hybrid precoding method based on orthogonal matching pursuit in full-duplex millimeter wave bidirectional relay Download PDFInfo
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Abstract
The invention discloses a self-interference suppression hybrid precoding method based on orthogonal matching pursuit in full-duplex millimeter wave bidirectional relay, which comprises the following steps: obtaining a corresponding singular value decomposition matrix according to each channel state, and calculating a baseband precoding matrix according to the singular value decomposition matrix; performing singular value decomposition on a self-interference channel of the relay based on a baseband precoding matrix, and selecting a left singular vector matrix corresponding to a zero singular value as a partial receiving precoding matrix; respectively carrying out singular value decomposition on self-interference channels of a transmitting end node and a receiving end node based on a baseband precoding matrix, and respectively selecting right singular vector matrixes corresponding to zero singular values as partial transmitting precoding matrixes; and designing a complete precoding matrix by combining the receiving precoding matrix and part of the transmitting precoding matrix. According to the method, the receiving and transmitting pre-coding matrix of each node is utilized under the mixed antenna structure of the millimeter wave system, self-interference suppression of nodes at two ends and relays is achieved according to the preset coding sequence, and the frequency spectrum efficiency of the system is improved.
Description
Technical Field
The invention relates to the technical field of communication, in particular to a self-interference suppression hybrid precoding method based on orthogonal matching pursuit in full-duplex millimeter wave bidirectional relay, namely a hybrid precoding algorithm based on orthogonal matching pursuit and null space projection.
Background
The millimeter wave analog-digital hybrid precoding structure consists of a radio frequency phase shifter and a digital baseband, and can reduce the complexity and cost of system hardware. Through the design of analog and digital pre-coding, the suppression of full-duplex self-interference can be realized, and the performance of the system can be effectively improved.
At present, the research on the precoding algorithm of the full-duplex millimeter wave system is very limited. Existing research is mainly directed to unidirectional relay systems, and only self-interference suppression on relay nodes is considered. However, such precoding algorithms cannot be applied to a bidirectional relay system in which self-interference exists in both end nodes.
Therefore, the invention provides a hybrid precoding algorithm applied to a bidirectional relay system.
Disclosure of Invention
The present invention is directed to solving, at least to some extent, one of the technical problems in the related art.
Therefore, the invention aims to provide a self-interference suppression hybrid precoding method based on orthogonal matching pursuit in full-duplex millimeter wave bidirectional relay.
In order to achieve the above object, an embodiment of the present invention provides a self-interference suppression hybrid precoding method based on orthogonal matching pursuit in a full-duplex millimeter wave bidirectional relay, including the following steps: step S1, obtaining corresponding singular value decomposition matrix according to each channel state information, and calculating baseband pre-coding matrix according to the singular value decomposition matrix; step S2, performing singular value decomposition on a self-interference channel of the relay node based on the baseband precoding matrix, and selecting a left singular vector matrix corresponding to a zero singular value as a partial receiving precoding matrix; step S3, based on the baseband pre-coding matrix, performing singular value decomposition on the self-interference channel of the transmitting end node and the self-interference channel of the receiving end node respectively, and selecting right singular vector matrixes corresponding to zero singular values as partial transmitting pre-coding matrixes respectively; step S4, designing a complete precoding matrix by combining the receiving precoding matrix and the partial transmitting precoding matrix.
According to the self-interference suppression hybrid pre-coding method based on the orthogonal matching pursuit in the full-duplex millimeter wave bidirectional relay, disclosed by the embodiment of the invention, the hybrid pre-coding algorithm based on the orthogonal matching pursuit and the null space projection can realize suppression of the full-duplex self-interference of each node in the bidirectional relay under a millimeter wave system hybrid antenna structure, so that the spectral efficiency of the system is obviously improved.
In addition, the self-interference suppression hybrid precoding method based on orthogonal matching pursuit in the full-duplex millimeter wave bidirectional relay according to the above embodiment of the present invention may further have the following additional technical features:
further, in an embodiment of the present invention, the step S1 specifically includes: step S101, processing the state information of each channel to obtain a singular value decomposition matrix; step S102, processing antenna response vectors, selecting the maximum value in the processed antenna response vectors as a radio frequency precoding vector by using an orthogonal matching tracking method to obtain a receiving radio frequency precoding matrix, and designing a transmitting radio frequency precoding matrix according to the receiving radio frequency precoding matrix; step S103, calculating the receiving radio frequency pre-coding matrix, the transmitting radio frequency pre-coding matrix and the singular value decomposition matrix to obtain the baseband pre-coding matrix.
Further, in an embodiment of the present invention, the step S2 specifically includes: step S201, singular value decomposition is carried out on a self-interference channel of the relay node, and a left singular vector matrix corresponding to a zero singular value is selected as an expected signal receiving matrix of the relay node; step S202, singular value decomposition is carried out on the expected signal receiving matrix, and a left singular vector matrix is selected again to serve as the partial receiving precoding matrix.
Further, in an embodiment of the present invention, in step S201, the singular value decomposition is performed on the self-interference channel of the relay node as:
wherein HRRFor the relay node to self-interfere with the channel matrix,
in order to correspond to the non-zero singular values,
for the left singular vector matrix corresponding to zero singular values,
is a right singular vector matrix.
Further, in an embodiment of the present invention, in step S202, the singular value decomposition is performed on the expected signal receiving matrix as:
wherein, UABRIs a matrix of left-singular vectors,
as a right singular vector matrix, FBBRpFor the desired signal receiving matrix, HARIs a channel matrix from node A to the relay node, HBRIs the channel matrix from node B to relay node.
Further, in an embodiment of the present invention, the step S3 specifically includes: step S301, singular value decomposition is carried out on a self-interference channel of a transmitting end node, and a right singular vector matrix corresponding to a zero singular value is selected as a first part of transmitting pre-coding matrix; step S302, singular value decomposition is carried out on a self-interference channel of a receiving end node, and a right singular vector matrix corresponding to a zero singular value is selected as a second part of a transmitting pre-coding matrix; step S303, combining the first part of transmit precoding matrix and the second part of transmit precoding matrix to obtain the part of transmit precoding matrix.
Further, in an embodiment of the present invention, in step S301, the singular value decomposition is performed on the self-interference channel of the transmitting end node as:
wherein HAAFor node A, the channel matrix, U, is self-interferingAAIs a matrix of left-singular vectors,
in order to correspond to the non-zero singular values,
is a left singular vector matrix corresponding to zero singular values.
Further, in an embodiment of the present invention, in step S302, the singular value decomposition is performed on the self-interference channel of the receiving end node as:
wherein HBBFor node B self-interference channel matrix, UBBIs a matrix of left-singular vectors,
in order to correspond to the non-zero singular values,
is a left singular vector matrix corresponding to zero singular values.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
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The foregoing and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a flowchart of a self-interference suppression hybrid precoding method based on orthogonal matching pursuit in a full-duplex millimeter wave bidirectional relay according to an embodiment of the present invention;
FIG. 2 is a flowchart of an orthogonal matching pursuit method according to an embodiment of the present invention;
fig. 3 is a specific flowchart of a self-interference suppression hybrid precoding method based on orthogonal matching pursuit in a full-duplex millimeter wave bidirectional relay according to an embodiment of the present invention;
fig. 4 is a graphical comparison of spectral efficiency performance of different hybrid precoding algorithms in accordance with an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
The following describes a self-interference suppression hybrid precoding method based on orthogonal matching pursuit in a full-duplex millimeter wave bidirectional relay according to an embodiment of the present invention with reference to the accompanying drawings.
Fig. 1 is a flowchart of a self-interference suppression hybrid precoding method based on orthogonal matching pursuit in a full-duplex millimeter wave bidirectional relay according to an embodiment of the present invention.
As shown in fig. 1, the self-interference suppression hybrid precoding method based on orthogonal matching pursuit in the full-duplex millimeter wave bidirectional relay includes the following steps:
in step S1, a corresponding singular value decomposition matrix is obtained according to each piece of channel state information, and a baseband precoding matrix is calculated according to the singular value decomposition matrix.
Further, as shown in fig. 2, step S1 specifically includes:
step S101, processing each channel state information to obtain a singular value decomposition matrix;
step S102, processing antenna response vectors, selecting the maximum value in the processed antenna response vectors as a radio frequency precoding vector by using an orthogonal matching tracking method to obtain a receiving radio frequency precoding matrix, and designing a transmitting radio frequency precoding matrix according to the receiving radio frequency precoding matrix;
step S103, calculating a receiving radio frequency pre-coding matrix, a transmitting radio frequency pre-coding matrix and a singular value decomposition matrix to obtain a baseband pre-coding matrix.
Namely, the singular vector matrixes corresponding to the nodes are respectively determined according to the channel state information of the system, then the received radio frequency precoding vectors are sequentially selected by using an orthogonal matching tracking method, meanwhile, the design of the transmitting precoding matrix is completed according to the received radio frequency precoding matrix, and finally the baseband precoding matrix is obtained.
The orthogonal matching tracking method utilizes the characteristics of a millimeter wave channel matrix and a radio frequency precoding matrix to carry out analog-digital combined precoding design.
In step S2, the self-interference channel of the relay node is subjected to singular value decomposition based on the baseband precoding matrix, and a left singular vector matrix corresponding to a zero singular value is selected as a partial reception precoding matrix.
Further, as shown in fig. 3, step S2 specifically includes:
step S201, singular value decomposition is carried out on a self-interference channel of the relay node, and a left singular vector matrix corresponding to a zero singular value is selected as an expected signal receiving matrix of the relay node.
In step S201, the singular value decomposition is performed on the self-interference channel of the relay node as:
in the formula, HRRFor the relay node to self-interfere with the channel matrix,
in order to correspond to the non-zero singular values,
for the left singular vector matrix corresponding to zero singular values,
is a right singular vector matrix.
Step S202, singular value decomposition is carried out on the expected signal receiving matrix, and the left singular vector matrix is selected again to serve as a part of receiving pre-coding matrix.
In step S202, the singular value decomposition is performed on the expected signal receiving matrix as:
in the formula of UABRIs a matrix of left-singular vectors,
as a right singular vector matrix, FBBRpFor the desired signal receiving matrix, HARIs a channel matrix from node A to the relay node, HBRIs the channel matrix from node B to relay node.
Namely, singular value decomposition is carried out on the self-interference channel of the relay node, and a left singular vector matrix corresponding to zero singular value is selected to realize self-interference suppression. On the basis, the relay node receives the precoding matrix as an expected signal receiving matrix of the nodes at two ends, and selects a left singular vector matrix of the expected signal as a partial receiving precoding matrix.
In step S3, singular value decomposition is performed on the self-interference channel of the transmitting end node and the self-interference channel of the receiving end node based on the baseband precoding matrix, and right singular vector matrices corresponding to zero singular values are selected as partial transmitting precoding matrices.
Further, as shown in fig. 3, step S3 specifically includes:
step S301, singular value decomposition is carried out on a self-interference channel of a transmitting end node, and a right singular vector matrix corresponding to a zero singular value is selected as a first part of transmitting pre-coding matrix;
in step S301, the singular value decomposition is performed on the self-interference channel of the transmitting end node as:
in the formula, HAANode A self-interference channel matrix, UAAIs a matrix of left-singular vectors,
in order to correspond to the non-zero singular values,
is a left singular vector matrix corresponding to zero singular values.
Step S302, singular value decomposition is carried out on a self-interference channel of a receiving end node, and a right singular vector matrix corresponding to a zero singular value is selected as a second part of a transmitting pre-coding matrix;
in step S302, the singular value decomposition is performed on the self-interference channel of the receiving end node as:
in the formula, HBBFor node B self-interference channel matrix, UBBIs a matrix of left-singular vectors,
in order to correspond to the non-zero singular values,
is a left singular vector matrix corresponding to zero singular values.
Step S303, combining the first part of the transmit precoding matrix and the second part of the transmit precoding matrix to obtain a part of the transmit precoding matrix.
And respectively carrying out singular value decomposition on self-interference channels of nodes at two ends, and selecting a right singular vector matrix corresponding to a zero singular value to realize self-interference suppression.
It can be understood that, in the embodiment of the present invention, the singular value decomposition is performed on the equivalent channel combining the relay receiving precoding matrix and the interference suppression transmitting precoding matrix, so that a complete two-end node transmitting precoding matrix and a complete relay node receiving precoding matrix can be obtained.
In step S4, a complete precoding matrix is designed in combination with the receive precoding matrix and the partial transmit precoding matrix.
Namely, the design of the pre-coding matrix received by the two end nodes and the pre-coding matrix transmitted by the relay node is finished based on the pre-coding matrix transmitted by the two end nodes and the pre-coding matrix received by the relay node.
The following describes the working process of the self-interference suppression hybrid precoding method based on orthogonal matching pursuit in the full-duplex millimeter wave bidirectional relay according to an embodiment of the present invention.
First, assume the conditions:
(1) the relay system consists of a node A, a node B and a relay node R, wherein the node A and the node B communicate through the relay node R, and a direct link does not exist between the two nodes;
(2) the number of receiving (transmitting) antennas, the number of receiving (transmitting) radio frequency links and the number of data streams of the node A are respectively NAR(NAT)、NARFR(NARFT) And NAS(ii) a The number of receiving (transmitting) antennas, the number of receiving (transmitting) radio frequency links and the number of data streams of the node B are respectively NBR(NBT)、NBRFR(NBRFT) And NBS(ii) a The number of receiving (transmitting) antennas, the number of receiving (transmitting) radio frequency links and the number of data streams of the node R are respectively NRR(NRT)、NRRFR(NRRFT) And NRS。
(3) The transmitting power of the node A, the node B and the relay node R is respectively PA，PBAnd PRVariance of noise is σ2.
(4) The channel model adopts a space sparse scattering millimeter wave channel model based on a Saleh-Vallenzuela model, and comprises K clusters and L sub-paths.
The embodiment of the present invention is implemented by the following steps in conjunction with fig. 3:
step one, a corresponding singular value decomposition matrix is obtained according to the channel state information of each channel, and the radio frequency and baseband pre-coding matrix of the system can be obtained by the pseudo code of the orthogonal matching tracking method in the table 1.
Table 1 orthogonal matching pursuit pseudo-code
And step two, obtaining an equivalent baseband channel by using the radio frequency precoding matrix. Relay node equivalent self-interference channel HRRIs decomposed into singular values
In the formula
And
left singular vector matrices corresponding to non-zero singular values and zero singular values, respectively. Selecting a left singular vector matrix corresponding to a zero singular value as a part of the relay node receiving baseband precoding matrix, namely
Singular value decomposition of the desired signal into
The left singular vector matrix is selected again as a part of the relay node receiving baseband precoding matrix, namely
Step three, the equivalent self-interference channel H of the node A and the node BAAAnd HBBAre respectively decomposed into singular values
In the formula V1And V0Right singular vector matrices corresponding to non-zero singular values and zero singular values, respectively. Selecting right singular vector matrixes corresponding to zero singular values as partial transmitting baseband precoding matrixes of the nodes A and B, namely
And
at the same time, as the transmit precoding matrix of the desired signal, in combination with FBBRtThe singular value decomposition of (A) can be expressed as
Combining the above results, it can be obtained that node a transmit precoding, node B transmit precoding, and relay node receive precoding are respectively:
GBBT＝GBBTtVBR
WBBT＝WBBTtVAR
step four, equivalent channel matrix HRBAnd HRASingular value decomposition is carried out, and a corresponding singular value matrix is selected to complete a precoding matrix WBBR，GBBRAnd FBBTThe design of (3).
Table 2 simulation parameter settings
During simulation, the parameter setting shown in fig. 4 is used, and as shown in fig. 4, it can be known that the self-interference suppression hybrid precoding algorithm based on orthogonal matching pursuit and null space projection provided by the invention is superior to the decoupling precoding method in the prior art. The method based on the orthogonal matching pursuit fully utilizes the characteristics of radio frequency and baseband precoding, and can obtain higher performance gain compared with a decoupling method which respectively designs two precoding methods. In addition, compared with a system which does not adopt self-interference suppression, the interference suppression method provided by the invention can effectively suppress full-duplex self-interference in a bidirectional relay system.
According to the self-interference suppression hybrid precoding method based on the orthogonal matching pursuit in the full-duplex millimeter wave bidirectional relay, which is provided by the embodiment of the invention, the singular vector matrix of each channel matrix is taken as a target, and the singular vector matrix is approximated by analog and digital precoding matrixes through an iterative algorithm. On the basis, based on an orthogonal matching tracking method and a null space projection method, self-interference suppression and spectral efficiency improvement of each node are achieved by using a receiving precoding matrix of a relay node and transmitting precoding matrices of nodes at two ends respectively, and then other transmitting and receiving precoding matrix designs are completed according to the designed self-interference suppression matrix.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, various embodiments or examples and features of different embodiments or examples described in this specification can be combined and combined by one skilled in the art without contradiction.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (8)
1. A self-interference suppression hybrid precoding method based on orthogonal matching pursuit in full-duplex millimeter wave bidirectional relay is characterized by comprising the following steps:
step S1, obtaining corresponding singular value decomposition matrix according to each channel state information, and calculating baseband pre-coding matrix according to the singular value decomposition matrix;
step S2, performing singular value decomposition on a self-interference channel of the relay node based on the baseband precoding matrix, and selecting a left singular vector matrix corresponding to a zero singular value as a partial receiving precoding matrix;
step S3, based on the baseband pre-coding matrix, performing singular value decomposition on the self-interference channel of the transmitting end node and the self-interference channel of the receiving end node respectively, and selecting right singular vector matrixes corresponding to zero singular values as partial transmitting pre-coding matrixes respectively;
step S4, designing a complete precoding matrix by combining the receiving precoding matrix and the partial transmitting precoding matrix.
2. The self-interference suppression hybrid precoding method based on orthogonal matching pursuit in full-duplex millimeter wave bidirectional relay according to claim 1, wherein the step S1 specifically includes:
step S101, processing the state information of each channel to obtain a singular value decomposition matrix;
step S102, processing antenna response vectors, selecting the maximum value in the processed antenna response vectors as a radio frequency precoding vector by using an orthogonal matching tracking method to obtain a receiving radio frequency precoding matrix, and designing a transmitting radio frequency precoding matrix according to the receiving radio frequency precoding matrix;
step S103, calculating the receiving radio frequency pre-coding matrix, the transmitting radio frequency pre-coding matrix and the singular value decomposition matrix to obtain the baseband pre-coding matrix.
3. The self-interference suppression hybrid precoding method based on orthogonal matching pursuit in full-duplex millimeter wave bidirectional relay according to claim 1, wherein the step S2 specifically includes:
step S201, singular value decomposition is carried out on a self-interference channel of the relay node, and a left singular vector matrix corresponding to a zero singular value is selected as an expected signal receiving matrix of the relay node;
step S202, singular value decomposition is carried out on the expected signal receiving matrix, and a left singular vector matrix is selected again to serve as the partial receiving precoding matrix.
4. The self-interference suppression hybrid precoding method based on orthogonal matching pursuit in the full-duplex millimeter wave bidirectional relay according to claim 3, wherein the step S201 is to perform singular value decomposition on the self-interference channel of the relay node to:
wherein HRRFor the relay node to self-interfere with the channel matrix,
in order to correspond to the non-zero singular values,
for the left singular vector matrix corresponding to zero singular values,
is a right singular vector matrix.
5. The self-interference suppression hybrid precoding method based on orthogonal matching pursuit in full-duplex millimeter wave bidirectional relay according to claim 3, wherein the step S202 is to perform singular value decomposition on the expected signal receiving matrix as:
wherein, UABRIs a matrix of left-singular vectors,
as a right singular vector matrix, FBBRpFor the desired signal receiving matrix, HARIs a channel matrix from node A to the relay node, HBRIs the channel matrix from node B to relay node.
6. The self-interference suppression hybrid precoding method based on orthogonal matching pursuit in full-duplex millimeter wave bidirectional relay according to claim 1, wherein the step S3 specifically includes:
step S301, singular value decomposition is carried out on a self-interference channel of a transmitting end node, and a right singular vector matrix corresponding to a zero singular value is selected as a first part of transmitting pre-coding matrix;
step S302, singular value decomposition is carried out on a self-interference channel of a receiving end node, and a right singular vector matrix corresponding to a zero singular value is selected as a second part of a transmitting pre-coding matrix;
step S303, combining the first part of transmit precoding matrix and the second part of transmit precoding matrix to obtain the part of transmit precoding matrix.
7. The self-interference suppression hybrid precoding method based on orthogonal matching pursuit in full-duplex millimeter wave bidirectional relay according to claim 1, wherein the step S301 is to perform singular value decomposition on the self-interference channel of the transmitting end node as:
wherein HAAFor node A, the channel matrix, U, is self-interferingAAIs a matrix of left-singular vectors,
in order to correspond to the non-zero singular values,
is a left singular vector matrix corresponding to zero singular values.
8. The self-interference suppression hybrid precoding method based on orthogonal matching pursuit in the full-duplex millimeter wave bidirectional relay according to claim 6, wherein the step S302 is to perform singular value decomposition on the self-interference channel of the receiving end node as follows:
wherein HBBFor the node B self-interference channel matrix,UBBis a matrix of left-singular vectors,
in order to correspond to the non-zero singular values,
is a left singular vector matrix corresponding to zero singular values.
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