阅读说明：本技术 一种基于毫米波通信的主动窃听环境下波束成形优化方法 (It is a kind of that beam forming optimization method under environment is actively eavesdropped based on millimetre-wave attenuator ) 是由 芮贤义 沈学放 于 2019-09-27 设计创作，主要内容包括：本发明公开一种基于毫米波通信的主动窃听环境下的波束成形优化方法,该方法将毫米波聚类射线信道模型转化为离散角度域信道模型,以将传输簇中的路径映射成归一化阵列响应组成的酉矩阵U的列向量；基于凸优化理论计算出使系统安全速率最大化的自适应功率分配因子η<Sup>*</Sup>；从酉矩阵U的列向量中对应于窃听者独自传播时对应的列向量,基于计算出的所述最优功率分配因子η<Sup>*</Sup>,生成人工噪声波束赋形矩阵并发送信息信号。该方法针对毫米波信道的稀疏特性,将毫米波聚类射线信道模型转化为离散角度域信道模型进行分析,采用一种基于人工噪声波束成形的自适应传输方案,有效地提高通信系统的保密速率,降低窃听用户的窃听能力,提高通信系统的安全性。(The present invention discloses a kind of beam forming optimization method actively eavesdropped under environment based on millimetre-wave attenuator, millimeter wave cluster ray channel model is converted discrete angular domain channel model by this method, with the column vector for the unitary matrice U for forming the map paths transmitted in cluster at normalization array response；The maximized adaptive tracking control factor η of system safe rate that sends as an envoy to is calculated based on convex optimum theory * ；Correspond to corresponding column vector when listener-in propagates alone from the column vector of unitary matrice U, is based on the calculated optimal power allocation factor η * , generate man made noise's wave beam formed matrix and concurrently deliver letters information signal.This method is directed to the sparse characteristic of millimeter wave channel, discrete angular domain channel model is converted by millimeter wave cluster ray channel model to analyze, using a kind of adaptive transmission scheme based on man made noise's beam forming, effectively improve the secrecy rate of communication system, the eavesdropping capability for reducing eavesdropping user, improves the safety of communication system.)

1. a kind of actively eavesdrop beam forming optimization method under environment based on millimetre-wave attenuator, which is characterized in that the method Include the following steps:

S1. discrete angular domain channel model is converted by millimeter wave cluster ray channel model, the discrete angular domain channel model The map paths in cluster will be transmitted into the column vector of the unitary matrice U of normalization array response composition；

S2. the maximized adaptive tracking control factor η of system safe rate that sends as an envoy to is calculated based on convex optimum theory^*；

S3. correspond to corresponding column vector when listener-in propagates alone according to the angle of departure from the column vector of unitary matrice U, based on The optimal power allocation factor η calculated^*, generate man made noise's wave beam formed matrix and concurrently deliver letters information signal.

2. actively eavesdropping beam forming optimization method under environment, feature based on millimetre-wave attenuator as described in claim 1 It is,

The millimeter wave clusters ray channel model, includes information transmitting terminal, the first user terminal, second user end, the transmitting Channel state information of the information that end is sent comprising the first user terminal, the estimation at second user end.

3. actively eavesdropping beam forming optimization method under environment, feature based on millimetre-wave attenuator as claimed in claim 2 It is,

The information transmitting terminal is configured to the extensive antenna array that quantity is N, and the first user terminal, second user end configure one Root antenna,

Wherein, second user end, which attempts to eavesdrop, is sent to the information of the first user terminal from information transmitting terminal and while attempting eavesdropping Interference signal is sent to the first user terminal.

4. actively eavesdropping beam forming optimization method under environment, feature based on millimetre-wave attenuator as described in claim 1 It is,

In the S1, the map paths in cluster will be transmitted into normalization array response composition by discrete angular domain channel model The column vector of unitary matrice U

Wherein, Nt is transmitting antenna number, and β is path attenuation, and L is all resolution path numbers,It is Channel complex gain vector, a certain column of U matrix represent a space can resolution path.

5. actively eavesdropping beam forming optimization method under environment, feature based on millimetre-wave attenuator as described in claim 1 It is, in the S2, passes through maxR_sS.t. η ∈ [0,1] solution makes the maximized power allocation factor η of system safe rate^*。

6. actively eavesdropping beam forming optimization method under environment, feature based on millimetre-wave attenuator as described in claim 1 It is, in the S3, the information signal x of transmission_AComprising information signal and interference signal, indicate are as follows:

Wherein, η^*For power allocation factor, P_AFor the total transmission power of transmitting terminal,It is legitimate receipt end Information signal MRT (maximum ratio transmission) wave beam forming vector, L_EFor tapping channel resolution path number, L_CFor tapping channel with it is legal Channel ground co-route number, For the tax of artificial noise waves beam Shape matrix, there is h_ADW₂=0,For artificial noise signal, and

7. actively eavesdropping beam forming optimization method under environment, feature based on millimetre-wave attenuator as described in claim 1 It is, in the case where actively eavesdropping environment, the signal that the first user terminal, second user termination receive is respectively indicated are as follows:

Wherein, n_BAnd n_ERespectively indicate independent same distribution additive white Gaussian noise, the n of zero-mean_B、 And P_E For interference signal transmission power.

Technical field

The invention belongs to safety of physical layer technical fields in wirelessly communicating, and in particular to a kind of master based on millimetre-wave attenuator Beam forming optimization method under dynamic eavesdropping environment.

Background technique

In recent years, the development of wireless communication allows people's access to wireless communication network whenever and wherever possible.However, wireless pass The broadcast characteristic broadcast means that all nodes in transmission range can receive the signal of information source sending, the information of legitimate user It is easy to be ravesdropping user's acquisition.Thus it is guaranteed that the safe transmission of wireless communication becomes particularly important.Relative to traditional physical layer Method, safety of physical layer are intended to the physical layer characteristic using wireless communication, such as noise, decline, are with the theory in information theory The safety of basic guarantee wireless communication.

Wyner in 1975 defines noisy tapping channel model for the first time, and proves the signal-to-noise ratio ratio for working as tapping channel Complete secret communication may be implemented when main channel is low, and will can still guarantee minor channel information reliable transmission not against key Rate is defined as secrecy rate.Into at the end of the 20th century, the appearance of MIMO technology has greatly pushed the development of wireless communication technique, more Antenna technology is that wireless communication safety of physical layer brings new opportunities and challenges.In recent years, it is more to have lot of documents research and utilization The secrecy rate of antenna technology raising safety of physical layer.For multiaerial system, using secrecy rate as target, transmitting is believed Number carry out spatial distribution design be research hotspot.In such designs, beam forming technique is important design parameter therein.Wave Beam shaping technology improves communication efficiency by guiding information flow into legitimate user.And existing research is directed to passive wiretapping field mostly Scape, for actively eavesdropping scene, with the enhancing of illegal node eavesdropping capability, there may be with malicious sabotage in communication scenes Ability actively eavesdrops node, these eavesdropping nodes destroy normal communication while eavesdropping, causes safely to system bigger It threatens.Noise jamming, which refers to illegal node oneself or other people is requested to cooperate, emits interference signal, and interfering legality recipient normally connects Collect mail number, by it is a kind of it is indirect in a manner of realize oneself enhancing eavesdropping target.

Nowadays, with the characteristics of high rate, great capacity and extremely low time delay and the 5G network of target had stepped into already Commercialization stage, 5G wireless technology will join all applications, service, things by a wireless network flexibly, reliable, safe It is connected to together, into the epoch of all things on earth mobile interchange.5G network considers full frequency band as a whole, that is, considers using with continuous big bandwidth High band (high band for referring generally to 6GHz or more) meet the high user experience rate in hot spot region and power system capacity need Ask, at the same in, low frequency network interworking solve the problems, such as that high frequency covering power is weaker, realize the whole network covering.Positioned at about 30~ The millimeter wave frequency band of 300GHz becomes the great competition of 5G network with its High Availabitity bandwidth and the characteristics of can provide a few Gbit/s rates High frequency candidate's frequency range of power is particularly suitble to the 60GHz of short-distance transmission to be standardized by multiple standard groups.Keep logical The privacy of letter and safety are always one of the critical issue of wireless network research, for millimetre-wave attenuator.Millimeter wave There is the main feature of safety of physical layer in communication system:

(1) due to high path loss, millimeter wave transmission range is shorter.So only geographical location and the closer eavesdropping of legitimate user Person is possible to capture useful signal；

(2) due to the use of highly directional wave beam, listener-in receives SNR may be very low, to can not eavesdrop Restore useful signal in message；

(3) particularly, if listener-in is located at millimetre-wave attenuator chain road, signal may be blocked and caused in communication link Disconnected, this also prevents signal and is ravesdropping for another angle.

Therefore, for opposite traditional microwave system, millimeter-wave systems can provide better secure communication performance.However, This, which is not meant to millimetre-wave attenuator naturally, has absolute safety.In view of the generality of wireless connection, it is a large amount of sensitive and Confidential information is transmitted such as finance data, electronic cipher art and personal video by millimeter wave radio channel.Therefore it provides Security service is still millimeter wave network design and one of the top priority that realization must be realized.

Summary of the invention

Based on the above issues, it is an object of the present invention to propose a kind of actively eavesdropping under environment based on millimetre-wave attenuator Beam forming optimization method, this method be based on the maximized millimetre-wave attenuator of safe rate actively eavesdrop beam forming under environment Optimization, when eavesdropping end using active interference volume, by legal using MRT (high specific) transmission in legal signal transmitting terminal Signal sends artificial noise signal with to eavesdropping end, using a kind of based on the power distribution method for maximizing safe rate, effectively Improve security of system energy.

To achieve the above object, the present invention adopts the following technical scheme: (being adjusted again when finalizing a text)

A kind of beam forming optimization method based on millimetre-wave attenuator, which is characterized in that

Described method includes following steps:

S1. it according to millimetre-wave attenuator active tapping channel model, converts millimeter wave cluster ray channel model to discrete Angle domain channel model, the discrete angular domain channel model will transmit the map paths in cluster into normalization array response composition The column vector of unitary matrice U；

S2. the maximized adaptive tracking control factor η of system safe rate that sends as an envoy to is calculated based on convex optimum theory^*；

S3. correspond to corresponding column vector when listener-in propagates alone according to launch angle from the column vector of unitary matrice U, Based on the calculated optimal power allocation factor η^*, generate man made noise's wave beam formed matrix and concurrently deliver letters information signal.

Preferably, in this method, transmitting terminal includes the estimation channel state information of the first user, second user.

Preferably, in this method, information transmitting terminal is configured to the extensive antenna array that quantity is N, and the first user, second are used An antenna is configured per family,

Wherein, second user attempts eavesdropping and is sent to the information of the first user and while attempting eavesdropping to the from transmitting terminal One user sends interference signal.

Preferably, in this method, the column vector of unitary matrice U includes:

Wherein, Nt is transmitting antenna number, and β is path attenuation, and L is all resolution path numbers, It is channel complex gain vector, a certain column of U matrix represent a space can resolution path.

Preferably, in the S3, pass through maxR_sS.t. η ∈ [0,1] solution makes the maximized power of system safe rate point With factor η^*。

Preferably, in this method, transmitting terminal joint sends information signal and interference signal, the signal x of transmission_AIt can indicate Are as follows:

Wherein, η^*For the optimal power allocation factor, P_AFor the total transmission power of transmitting terminal,It is to close Method receiving end information signal MRT (maximum ratio transmission) wave beam forming vector, L_EFor tapping channel resolution path number, L_CFor eavesdropping letter Road and legitimate channel ground co-route number, Manually to make an uproar Beam of sound figuration matrix, there is h_ADW₂=0,For artificial noise signal, and have

Preferably, in this method, the signal that the first user, second user receive in the case where actively eavesdropping environment is respectively indicated Are as follows:

Wherein, n_BAnd n_ERespectively indicate the independent same distribution additive Gaussian white noise n of zero-mean_B、Sound, And P_EFor interference signal transmission power.

Beneficial effect

Scheme in compared with the existing technology, the embodiment advantage that the application proposes:

The application proposes a kind of beam forming optimization method actively eavesdropped under environment based on millimetre-wave attenuator, in millimeter Wave is actively eavesdropped under environment, it is contemplated that millimeter wave cluster ray channel model is converted discrete angular by the millimeter wave characteristic of channel Domain channel model, discrete angular domain channel model will likely transmission cluster in map paths at normalization array response composition The column vector of unitary matrice U, which simplify quantitative analysis work in the present context.

The method that the application proposes, the wave beam that high specific transmission and man made noise are used in combination in the case where actively eavesdropping environment are excellent Change method, and found by convex optimum theory and make the maximized optimal power allocation factor of system safe rate under this method, The eavesdropping capability for reducing eavesdropping user, improves the safety of communication system.

Detailed description of the invention

In order to illustrate more clearly of this specification embodiment or technical solution in the prior art, below will to embodiment or Attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only The some embodiments recorded in this specification, for those of ordinary skill in the art, in not making the creative labor property Under the premise of, it is also possible to obtain other drawings based on these drawings:

The traffic model figure of Fig. 1 embodiment of the present invention.

Fig. 2 is the angle domain channel model schematic diagram of the embodiment of the present invention.

The method and conventional method safe rate that Fig. 3 is the embodiment of the present invention are with the variation pair of legal transmitting terminal transmission power Than.

The method and conventional method safe rate that Fig. 4 is the embodiment of the present invention are with eavesdropping end interference signal transmission power variation Comparison.

Specific embodiment

For the technical solution for making those skilled in the art more fully understand that the application proposes, below in conjunction with this explanation Attached drawing in book embodiment is clearly and completely described the technical solution in this specification embodiment, it is clear that described Embodiment be only a part of the embodiment in this specification, instead of all the embodiments.Base in this manual one A or multiple embodiments, every other reality obtained by those of ordinary skill in the art without making creative efforts Example is applied, shall fall within the protection scope of the present application.