CN109004965B - Design method and device of hybrid beam forming filter based on millimeter wave MIMO system secure communication - Google Patents

Design method and device of hybrid beam forming filter based on millimeter wave MIMO system secure communication Download PDF

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CN109004965B
CN109004965B CN201810831982.7A CN201810831982A CN109004965B CN 109004965 B CN109004965 B CN 109004965B CN 201810831982 A CN201810831982 A CN 201810831982A CN 109004965 B CN109004965 B CN 109004965B
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beam forming
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CN109004965A (en
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李明
田筱雯
刘倩
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Dalian University of Technology
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/06—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
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
    • H04B7/0837—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using pre-detection combining
    • H04B7/0842—Weighted combining
    • H04B7/086—Weighted combining using weights depending on external parameters, e.g. direction of arrival [DOA], predetermined weights or beamforming
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B7/00—Radio transmission systems, i.e. using radiation field
    • H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
    • H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
    • H04B7/0413—MIMO systems

Abstract

The invention discloses a method and a device for designing a hybrid beam forming filter based on safe communication of a millimeter wave MIMO system, wherein the method comprises the following steps: judging whether an eavesdropping channel exists or not, if so, constructing an analog beamforming filter according to millimeter wave MIMO channel information corresponding to the eavesdropping end, otherwise, directly setting the MIMO channel information of a legal channel as an initial matrix of iterative solution, and constructing the analog beamforming filter, wherein the obtained digital beamforming filters are all obtained based on an SVD method. The invention considers the knowledge of the channel information of the eavesdropping terminal based on the sparsity of the millimeter wave channel and a plurality of restrictions of the design of the analog filter in the millimeter wave system, jointly selects the analog beam forming filters of the sending party and the receiving party based on the codebook, can simply, conveniently and efficiently improve the secrecy capacity of the system, and enables the physical layer security technology, namely the beam forming technology, which is mature and applied in the traditional MIMO system to be better transplanted into the millimeter wave MIMO system.

Description

Design method and device of hybrid beam forming filter based on millimeter wave MIMO system secure communication
Technical Field
The invention relates to the technical field of wireless communication, in particular to a method and a device for designing a hybrid beam forming filter based on millimeter wave MIMO system secure communication.
Background
Millimeter wave communication can provide higher bandwidth compared with the traditional communication mode, and is an important technical support for the future 5G communication network. In order to overcome the short wavelength attenuation of the millimeter wave system, an antenna array of Multiple Input Multiple Output (MIMO) is generally used to transmit signals. If each antenna needs to be equipped with a Radio Frequency (RF) chain according to the hardware configuration of the conventional communication system, the system must include a large number of antennas, which is difficult to implement in practical applications. Therefore, it is more economical to apply the analog/digital hybrid beamformer as a hardware carrier of the millimeter wave communication system in practice. The analog portion of a hybrid beamformer is typically constructed with a plurality of analog Phase Shifters (PS), while the digital portion employs a small number of RF chains to provide multiplexing or use for multi-user communications. Existing methods for designing hybrid beamforming filters generally fall into two categories: 1) codebook-based methods, i.e., the construction of the analog beamforming filter is selected from among known codebooks; 2) a codebook-free approach, i.e. assuming infinite resolution of the PS, can achieve arbitrary angles. The former is simpler and more efficient, and has stronger adaptability to the sparse characteristic of a millimeter wave system channel, so that the method is more mainstream.
Conventional hybrid beamforming filter design methods only consider improving the channel efficiency of point-to-point communications and do not consider security issues in eavesdropping on the channel. In recent years, physical layer security has gradually gained wide attention, and especially in a traditional MIMO system, beam forming is used as a mature technology and is well applied in the security field. The beamforming technology utilizes the larger degree of Freedom (DoF) in space domain provided by multiple antennas to adjust the signal transmission direction of the sender, so as to avoid information leakage, and also can intentionally interfere with potential eavesdroppers by sending artificial noise. However, these achievements in the conventional MIMO channel cannot be directly applied to the millimeter wave channel due to the sparsity characteristic of the millimeter wave channel and the design limitation of the analog filter in the millimeter wave system.
Disclosure of Invention
In view of the shortcomings of the prior art, an object of the present invention is to provide a method for designing a hybrid beamforming filter based on secure communication of a millimeter wave MIMO system, so as to solve the problem that the existing beamforming security technology cannot be applied to the millimeter wave MIMO system.
The invention is realized by the following technical scheme:
a design method of a hybrid beam forming filter based on millimeter wave MIMO system secure communication is characterized by comprising the following steps:
step 101, detecting whether millimeter wave MIMO channel information corresponding to an eavesdropping terminal is acquired, if so, executing step 102a, otherwise, executing step 102 b;
102a, constructing an iterative solved initial matrix according to millimeter wave MIMO channel information corresponding to the eavesdropping terminal, iteratively solving to obtain analog beamforming filters of a sender and a receiver, and executing step 104;
step 102b, directly setting the MIMO channel information of the legal channel as an initial matrix of iterative solution, and obtaining analog beam forming filters of a sender and a receiver by iterative solution, and executing step 103;
step 103, obtaining power which can be used for transmitting artificial noise according to the given legal communication quality requirement, and executing step 105;
step 104, performing SVD on the obtained equivalent channel, wherein the obtained left unitary matrix is a digital beam forming filter of a receiving party, the obtained right unitary matrix is a digital beam forming filter of a sending party, and normalization processing is performed according to a power limiting condition;
and 105, performing SVD on a baseband equivalent channel obtained according to the digital beam forming filter of the receiving party and the digital beam forming filter of the sending party, wherein the front columns of the obtained right unitary matrix are digital beam forming filters for transmitting useful signals by the sending party, the rear columns of the obtained right unitary matrix are digital beam forming filters for transmitting artificial noise, and the front columns of the obtained left unitary matrix are digital beam forming filters for the receiving party, and performing normalization processing according to a power limiting condition.
Based on the above-mentioned solution, it is further preferred that,
the iterative solution of the analog beamforming filters of the sender and the receiver comprises:
for each iteration, the corresponding column vector in the matrix of the analog beamforming filter is determined based on the maximum corresponding signal-to-noise ratio.
Based on the above-mentioned solution, it is further preferred that,
said determining corresponding column vectors among the analog beamforming filter matrices comprises:
and after each iteration is finished, performing Schmitt regularization on the two obtained column vectors, and removing components corresponding to the two column vectors in the channel matrix to serve as updated variables to prepare for the next iteration.
Based on the above-mentioned solution, it is further preferred that,
the column vectors are selected from a known codebook.
Based on the above-mentioned solution, it is further preferred that,
said step 103 of determining the power available for transmitting the artificial noise according to the given legal communication quality requirement further comprises:
and determining the minimum power for transmitting the useful signal and the maximum power for transmitting the artificial noise according to the quality threshold of legal communication.
Based on the above-mentioned solution, it is further preferred that,
after the minimum power for transmitting the useful signal and the maximum power for transmitting the artificial noise are obtained, the transmitted signal after power distribution has the following form:
Figure GDA0002924668290000031
another object of the present invention is to provide an apparatus for implementing the above method, which is characterized by comprising:
the detection unit is used for detecting whether millimeter wave MIMO channel information corresponding to the eavesdropping terminal is acquired;
the analog calculation unit is used for solving the analog beamforming filters of the sender and the receiver based on the detection result of the detection unit, and specifically comprises the following steps:
when millimeter wave MIMO channel information corresponding to an eavesdropping terminal can be acquired, an initial matrix of iterative solution is constructed according to the MIMO channel information, and the iterative solution is carried out to obtain analog beam forming filters of a sender and a receiver;
when millimeter wave MIMO channel information corresponding to an eavesdropping terminal cannot be acquired, the MIMO channel information of a legal channel is directly set as an initial matrix of iterative solution, the analog beam forming filters of a sender and a receiver are obtained through iterative solution, and power which can be used for transmitting artificial noise is obtained according to a given legal communication quality requirement;
the digital computing unit is used for obtaining digital beam forming filters of a sender and a receiver according to the SVD, and specifically comprises:
when the detection unit can acquire millimeter wave MIMO channel information corresponding to an eavesdropping end, carrying out SVD decomposition on the obtained equivalent channel, wherein the obtained left unitary matrix is a digital beam forming filter of a receiving party, the obtained right unitary matrix is a digital beam forming filter of a sending party, and normalization processing is carried out according to a power limiting condition;
when the detection unit cannot acquire millimeter wave MIMO channel information corresponding to an eavesdropping end, SVD decomposition is carried out on an obtained effective channel, a plurality of front rows of an obtained left unitary matrix are digital beam forming filters of a receiving party, a plurality of front rows of an obtained right unitary matrix are beam forming filters of useful signals of a sending party, a plurality of rear rows of an obtained right unitary matrix are digital beam forming filters of a transmitting party of artificial noise, and normalization processing is carried out according to power limiting conditions.
Through the technical scheme, the invention discloses a method and a device for designing a hybrid beam forming filter based on millimeter wave MIMO system secure communication, compared with the existing hybrid filter design which only considers the channel efficiency of improving point-to-point communication and does not consider the security problem in an eavesdropping channel, the invention can simply, conveniently and efficiently improve the secrecy capacity of a millimeter wave system based on the sparsity of a millimeter wave channel and a plurality of limitations of the design of an analog filter in the millimeter wave system, and considers the knowing condition of eavesdropping end channel information, and jointly selects the analog beam forming filters of a sender and a receiver based on a codebook, so that the physical layer security technology, namely the beam forming technology, which is mature in the traditional MIMO system is better transplanted to the millimeter wave MIMO system.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a method for designing a hybrid beamforming filter based on secure communication of a millimeter wave MIMO system according to the present invention;
fig. 2 is a schematic structural diagram of a configuration apparatus of a hybrid beamforming filter based on millimeter wave MIMO system secure communication according to the present invention;
fig. 3 is a schematic diagram of a millimeter wave MIMO system with an eavesdropper.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the following describes the technical solutions of the embodiments of the present invention clearly and completely with reference to the accompanying drawings in the embodiments of the present invention:
as shown in fig. 1: a design method of a hybrid beam forming filter based on millimeter wave MIMO system secure communication comprises the following steps:
step 101, detecting whether millimeter wave MIMO channel information H corresponding to eavesdropping end is acquiredeIf yes, step 102a is executed, otherwise step 102b is executed.
When the channel information of the eavesdropping terminal can be monitored, a legal communication user can utilize the information to process signals, and the signals are not sent to the eavesdropping channel by the technical means of beam forming. When the channel information of the eavesdropping terminal can not be monitored, a legal communication user can only adopt a mode of sending artificial noise to force the signal-to-noise ratio of the received signal of the eavesdropping terminal to be reduced, so that the eavesdropping terminal can not eavesdrop useful information.
Step 102a, according to the corresponding milli of the eavesdropping terminalH-meter wave MIMO channel informationeConstructing an initial matrix of iterative solution, wherein the specific form is as follows: h for obtaining millimeter wave MIMO channel information at eavesdropping endeDo SVD decomposition, i.e.
Figure GDA0002924668290000051
Then H in a legal channelbOn the basis of the above-mentioned method, the component of eavesdropping channel is removed, so that the initial matrix of iterative solution can be obtained
Figure GDA0002924668290000052
Iterative solution is carried out to obtain the analog beam forming filters of the transmitting party and the receiving party
Figure GDA0002924668290000053
And
Figure GDA0002924668290000054
step 104 is then performed.
Step 102b, directly H information of MIMO channel of legal channelbSet as the initial matrix of the iterative solution, i.e. H1＝Hb(ii) a Then, the analog beam forming filter of the transmitting party and the receiving party is obtained through iterative solution
Figure GDA0002924668290000055
And
Figure GDA0002924668290000056
step 103 is then performed.
Specifically, iterative solution yields analog beamforming filters for the sender and receiver
Figure GDA0002924668290000057
And
Figure GDA0002924668290000058
the method comprises the following specific steps: each iteration determines the corresponding column vector in the matrix of the analog beamforming filter according to the maximum SNR of the corresponding legal channel receiverThe body formula is:
Figure GDA0002924668290000059
the corresponding column vector determined is:
Figure GDA00029246682900000510
and
Figure GDA00029246682900000511
further, the determining a corresponding column vector among the analog beamforming filter matrices comprises:
two column vectors obtained for each iteration end pair
Figure GDA00029246682900000512
And
Figure GDA00029246682900000513
schmitt regularization is performed and the channel matrix H isiThe components corresponding to the two column vectors are removed and used as updated variables to prepare the next iteration, which specifically comprises the following steps:
when the value of i is 1, the value of i,
Figure GDA00029246682900000514
when i is more than or equal to 2, the following updating strategies are adopted:
Figure GDA00029246682900000515
Figure GDA00029246682900000516
Figure GDA0002924668290000061
the column vectors are encoded by a known codebook
Figure GDA0002924668290000062
And
Figure GDA0002924668290000063
and (4) selecting.
Step 103, according to the given legal communication quality requirement Rb≥RγWherein
Figure GDA0002924668290000064
For the rate of legal communication, SbFor legal communication signal-to-noise ratio, power P for transmitting artificial noise is obtainedAN＝P-PsWhere P is the total power transmitted, PsStep 105 is executed to ensure the useful signal transmitting power required by the legal communication quality;
step 104, using the determined analog beamforming filters of the transmitting side and the receiving side
Figure GDA0002924668290000065
And
Figure GDA0002924668290000066
can obtain the equivalent channel of the base band
Figure GDA0002924668290000067
Subjecting it to SVD decomposition
Figure GDA0002924668290000068
Digital beam forming filter with left unitary matrix as receiving side
Figure GDA0002924668290000069
The obtained right unitary matrix is a digital beam forming filter of a transmitting side
Figure GDA00029246682900000610
And performing normalization processing according to power limiting conditions
Figure GDA00029246682900000611
The power limiting condition is
Figure GDA00029246682900000612
Step 105, the obtained baseband equivalent channel
Figure GDA00029246682900000613
Performing SVD decomposition
Figure GDA00029246682900000614
Digital beam forming filter with left unitary matrix as receiving side
Figure GDA00029246682900000615
Front N of the obtained right unitary matrixsBeam shaping filter for listing useful signal of sender
Figure GDA00029246682900000616
The rear columns of the obtained right unitary matrix are artificial noise transmitting side digital beam forming filters
Figure GDA00029246682900000617
And performing normalization processing according to power limiting conditions
Figure GDA00029246682900000618
And
Figure GDA00029246682900000619
specifically, step 103 is performed according to a given legal communication quality requirement Rb≥RγDetermining a power P available for transmitting artifactsAN＝P-PsFurther comprising:
quality threshold R in accordance with legal communicationb＝RγDetermining the minimum power P for transmitting the useful signalsAnd maximum power P of transmitting artificial noiseAN＝P-Ps。
Determining the minimum power P of the transmitted useful signalsAnd maximum power P of transmitting artificial noiseANThen, the transmission signal after power distribution has the following form:
Figure GDA0002924668290000071
where s is legal information, w is artificial noise, FRFFor simulating transmit beamforming filters, FBBFor transmitting side digital beam-forming filter, P, used for transmitting encrypted informationsFor its transmission power, FBB,wFor the transmitting side digital beam-forming filter, P, used for transmitting artifactsANIs its transmit power.
As shown in fig. 2, the present invention further provides an apparatus for implementing the method, including:
the detection unit is used for detecting whether millimeter wave MIMO channel information corresponding to the eavesdropping terminal is acquired;
the analog calculation unit is used for solving the analog beamforming filters of the sender and the receiver based on the detection result of the detection unit, and specifically comprises the following steps:
when millimeter wave MIMO channel information corresponding to an eavesdropping terminal can be acquired, an initial matrix of iterative solution is constructed according to the MIMO channel information, and the iterative solution is carried out to obtain analog beam forming filters of a sender and a receiver;
when millimeter wave MIMO channel information corresponding to an eavesdropping terminal cannot be acquired, the MIMO channel information of a legal channel is directly set as an initial matrix of iterative solution, the analog beam forming filters of a sender and a receiver are obtained through iterative solution, and power which can be used for transmitting artificial noise is obtained according to a given legal communication quality requirement;
the digital computing unit is used for obtaining digital beam forming filters of a sender and a receiver according to the SVD, and specifically comprises:
when the detection unit can acquire millimeter wave MIMO channel information corresponding to an eavesdropping end, carrying out SVD decomposition on the obtained equivalent channel, wherein the obtained left unitary matrix is a digital beam forming filter of a receiving party, the obtained right unitary matrix is a digital beam forming filter of a sending party, and normalization processing is carried out according to a power limiting condition;
when the detection unit can not acquire millimeter wave MIMO channel information corresponding to an eavesdropping terminal, SVD decomposition is carried out on a baseband equivalent channel obtained according to a digital beam forming filter of a receiving party and a digital beam forming filter of a sending party, the obtained left unitary matrix is the digital beam forming filter of the receiving party, the front rows of the obtained right unitary matrix are beam forming filters of useful signals of the sending party, the rear rows of the obtained right unitary matrix are digital beam forming filters of the sending party of artificial noise, and normalization processing is carried out according to power limiting conditions.
The technical solution of the present invention is further illustrated by a specific application example as follows:
as shown in fig. 3, the sender passes NaRoot antenna and
Figure GDA0002924668290000072
an RF chain having NbRoot antenna and
Figure GDA0002924668290000081
receiver of one RF chain, simultaneous transmission NsA data stream. To ensure the efficiency of the transmission, assume
Figure GDA0002924668290000082
And has Ns≤NRF. In the system, there is simultaneously an eavesdropper with NeRoot antenna and NRFAn RF chain that attempts to eavesdrop on data received by a legitimate communication recipient.
The data to be transmitted first passes through an NRF×NsOf the basebandBBThen through NRFAn RFThe chain is up-converted and then passed through an analog beamforming filter FRFFinally by NaThe root antenna is launched. Wherein the digital beam shaping filter FBBCan be adjusted directly in amplitude and phase, while the analog beamforming filter FRFOnly its phase can be changed. In the codebook-based beamforming filter design approach described herein, the analog beamforming filter FRFIs from a predetermined codebook
Figure GDA0002924668290000083
Is selected out of the above. The beamforming filter on the transmitting side should meet certain power constraints, i.e.
Figure GDA0002924668290000084
Legal communication channel HbFor the most commonly used millimeter wave channel with limited scattering, the number of scatterers is L, each scatterer is assumed to contain only 1 path, and then the channel can be expressed as:
Figure GDA0002924668290000085
where ρ isbRepresents the average channel loss factor and is,
Figure GDA0002924668290000086
is the l th of Rayleigh distributionbChannel gain (complex number) of the strip path. Variables of
Figure GDA0002924668290000087
And
Figure GDA0002924668290000088
represents the lbThe incident angle and the exit angle of the swath path.
Figure GDA0002924668290000089
And
Figure GDA00029246682900000810
antenna response vectors for the sender and receiver, respectively. In this context, assuming a uniform linear antenna array is employed, they may be expressed as:
Figure GDA00029246682900000811
Figure GDA00029246682900000812
where λ is the wavelength of the millimeter wave signal and d is the distance between the antennas. Eavesdropping on communication channel HeThere is similar expression.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.

Claims (7)

1. A design method of a hybrid beam forming filter based on millimeter wave MIMO system secure communication is characterized by comprising the following steps:
step 101, detecting whether millimeter wave MIMO channel information corresponding to an eavesdropping terminal is acquired, if so, executing step 102a, otherwise, executing step 102 b;
102a, constructing an iterative solved initial matrix according to millimeter wave MIMO channel information corresponding to the eavesdropping terminal, iteratively solving to obtain analog beamforming filters of a sender and a receiver, and executing step 104;
step 102b, directly setting the MIMO channel information of the legal channel as an initial matrix of iterative solution, and obtaining analog beam forming filters of a sender and a receiver by iterative solution, and executing step 103;
step 103, obtaining power which can be used for transmitting artificial noise according to the given legal communication quality requirement, and executing step 105;
step 104, performing SVD on the analog beamforming filter obtained in step 102a, wherein the obtained left unitary matrix is a digital beamforming filter of a receiving party, the obtained right unitary matrix is a digital beamforming filter of a sending party, and normalization processing is performed according to a power limiting condition;
and 105, performing SVD on a baseband equivalent channel obtained according to the digital beam forming filter of the receiving party and the digital beam forming filter of the sending party, wherein the front columns of the obtained right unitary matrix are digital beam forming filters for transmitting useful signals by the sending party, the rear columns of the obtained right unitary matrix are digital beam forming filters for transmitting artificial noise, and the front columns of the obtained left unitary matrix are digital beam forming filters for the receiving party, and performing normalization processing according to a power limiting condition.
2. The method of claim 1, wherein the iterative solution of the analog beamforming filters for the transmitter and the receiver comprises:
for each iteration, the corresponding column vector in the matrix of the analog beamforming filter is determined based on the corresponding signal-to-noise ratio maximization principle.
3. The method of claim 2, wherein the determining corresponding column vectors among the analog beamforming filter matrix comprises:
and after each iteration is finished, performing Schmitt regularization on the two obtained column vectors, and removing components corresponding to the two column vectors in the channel matrix to serve as updated variables to prepare for the next iteration.
4. The method of claim 3, wherein the column vector is selected from a known codebook.
5. The method for designing a hybrid beamforming filter based on millimeter wave MIMO system secure communication according to any of claims 1 to 4, wherein the step 103 further comprises:
and determining the minimum power for transmitting the useful signal and the maximum power for transmitting the artificial noise according to the quality threshold of legal communication.
6. The method of claim 5, wherein after obtaining the minimum power for transmitting the useful signal and the maximum power for transmitting the artificial noise, the transmit signal after power distribution has the following form:
Figure FDA0002940909710000021
where s is legal information, w is artificial noise, FRFFor simulating transmit beamforming filters, FBBFor transmitting side digital beam-forming filter, P, used for transmitting encrypted informationsFor its transmission power, FBB,wFor the transmitting side digital beam-forming filter, P, used for transmitting artifactsANIs its transmit power.
7. An apparatus for implementing the design method of claim 1, comprising:
the detection unit is used for detecting whether millimeter wave MIMO channel information corresponding to the eavesdropping terminal is acquired;
the analog calculation unit is used for solving the analog beamforming filters of the sender and the receiver based on the detection result of the detection unit, and specifically comprises the following steps:
when millimeter wave MIMO channel information corresponding to an eavesdropping terminal can be acquired, an initial matrix of iterative solution is constructed according to the MIMO channel information, and the iterative solution is carried out to obtain analog beam forming filters of a sender and a receiver;
when millimeter wave MIMO channel information corresponding to an eavesdropping terminal cannot be acquired, the MIMO channel information of a legal channel is directly set as an initial matrix of iterative solution, the analog beam forming filters of a sender and a receiver are obtained through iterative solution, and power which can be used for transmitting artificial noise is obtained according to a given legal communication quality requirement;
the digital computing unit is used for obtaining digital beam forming filters of a sender and a receiver according to the SVD, and specifically comprises:
when the detection unit can acquire millimeter wave MIMO channel information corresponding to an eavesdropping terminal, performing SVD decomposition on the obtained analog beam forming filter, wherein the obtained left unitary matrix is a digital beam forming filter of a receiving party, the obtained right unitary matrix is a digital beam forming filter of a sending party, and normalization processing is performed according to a power limiting condition;
when the detection unit can not acquire millimeter wave MIMO channel information corresponding to an eavesdropping terminal, SVD decomposition is carried out on a baseband equivalent channel obtained according to a digital beam forming filter of a receiving party and a digital beam forming filter of a sending party, a plurality of columns in front of an obtained left unitary matrix are digital beam forming filters of the receiving party, a plurality of columns in front of an obtained right unitary matrix are beam forming filters of useful signals of the sending party, a plurality of columns in back of the obtained right unitary matrix are digital beam forming filters of the sending party of artificial noise, and normalization processing is carried out according to power limiting conditions.
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