WO2019006714A1 - Distributed secure beamforming method and apparatus based on artificial noise - Google Patents

Abstract

The present invention provides a distributed safety beamforming method based on artificial noise, the method comprising: transmitting, at an nth time slot, a first signal carrying a first artificial noise signal to the receiving end device; receiving the receiving end Transmitting, by the device, the feedback signal returned by the plurality of the first signals, according to the feedback signal, the transmit weight of the third artificial noise signal sent to the receiving end device by the (n+1)th time slot, so that the The third artificial noise signal has the least interference power at the receiving end device. The embodiment of the invention can minimize the interference power of the artificial noise signal transmitted by the transmitting end device at the receiving end device, and at the same time improve the security performance of the communication system.

Description

Distributed safety beamforming method and device based on artificial noise Technical field

The present invention relates to the field of communications technologies, and in particular, to a distributed safety beamforming method and apparatus based on artificial noise.

Background technique

Distributed Beamforming is a cooperative communication technology in which multiple transmitting devices transmit the same information to the target device and control the transmitting phase of the transmitting device to make the signals of multiple transmitting devices at the target end. The device is effectively merged.

In the distributed secure communication, when the eavesdropping device installs multiple antennas, the channel direction information may be estimated according to the signal sent by the transmitting end device to the receiving end device, thereby adjusting its own beamformer to enable the receiving of the eavesdropping device. The beam alignment is offset by the interference beam, which greatly reduces the security performance of the communication system.

Summary of the invention

The embodiment of the invention discloses a distributed safety beamforming method and device based on artificial noise, which can minimize the interference power of the artificial noise signal transmitted by the transmitting device at the receiving end device and improve the security performance of the communication system.

A first aspect of the embodiments of the present invention discloses a distributed safety beamforming method based on artificial noise, which is applied to a transmitting end device included in a distributed secure communication system, where the distributed secure communication system includes a plurality of the transmitting end devices, The receiving end device and the eavesdropping end device, the method comprising:

Transmitting, by the nth time slot, the first signal carrying the first artificial noise signal to the receiving end device, where the first artificial noise signal is used to interfere with the estimation accuracy of the first channel direction information by the eavesdropping device;

Receiving, by the receiving end device, a feedback signal returned by the plurality of the first signals, where the feedback signal includes a second artificial noise signal, where the second artificial noise signal is used to interfere with the eavesdropping device to the second channel direction Estimated accuracy of the information;

Adjusting the (n+1)th time slot to send the third party to the receiving end device according to the feedback signal Transmitting a weight of the noise signal to minimize interference power of the third artificial noise signal at the receiving device;

The nth time slot is a current time slot, the (n+1)th time slot is a next time slot of the current time slot, and the n is a positive integer.

As an optional implementation manner, in the first aspect of the embodiments of the present invention, the feedback signal further includes a control signal, where the (n+1)th time slot is adjusted to the receiving end according to the feedback signal The transmission weights of the device transmitting the third artificial noise signal include:

Decoding the feedback signal to obtain a control signal carried by the feedback signal;

And transmitting, according to the control signal, a transmission weight of the third artificial noise signal to the receiving end device in the (n+1)th time slot.

As an optional implementation manner, in the first aspect of the embodiments of the present invention, the first signal further includes confidential information, where the secret information sent by each of the transmitting end devices is for the same time slot. The transmission power of the same is the same, and the transmission power of the artificial noise signal is the same, and the sum of the transmission power of the secret information and the transmission power of the artificial noise signal is less than or equal to Preset threshold.

A second aspect of the embodiments of the present invention discloses a distributed safety beamforming method based on artificial noise, which is applied to a receiving end device included in a distributed secure communication system, where the distributed secure communication system further includes multiple transmitting devices and eavesdropping. End device, the method includes:

Receiving, by the nth time slot, a plurality of first signals sent by the transmitting end device, where the first signal includes a first artificial noise signal, where the first artificial noise signal is used to interfere with the eavesdropping device to the first channel Estimated accuracy of direction information;

Determining a feedback signal according to the plurality of the first signals, wherein the feedback signal includes a second artificial noise signal, and the second artificial noise signal is used to interfere with the estimation of the second channel direction information by the eavesdropping device And the feedback signal is used by the transmitting end device to adjust a transmission weight of the third artificial noise signal sent by the (n+1)th time slot to the receiving end device;

Transmitting the feedback signal to a plurality of the transmitting end devices.

As an optional implementation manner, in the first aspect of the embodiment of the present invention, determining, according to the plurality of the first signals, the feedback signal includes:

Determining, according to the plurality of the first signals, a first signal to interference and noise ratio SINR of the receiving end device in an nth time slot;

Comparing the first SINR with the stored second SINR of the nth slot to obtain a comparison result;

Based on the comparison result, a feedback signal is determined.

A third aspect of the embodiments of the present invention discloses a distributed security beamforming device, which is used in a transmitting end device included in a distributed secure communication system, and includes:

a sending unit, configured to send, to the receiving end device, a first signal carrying a first artificial noise signal, where the first artificial noise signal is used to interfere with the first channel direction information of the eavesdropping device Estimated accuracy;

a receiving unit, configured to receive a feedback signal returned by the receiving end device for the plurality of the first signals, where the feedback signal includes a second artificial noise signal, where the second artificial noise signal is used to interfere with the eavesdropping device Estimating accuracy of the second channel direction information;

And an adjusting unit, configured to adjust, according to the feedback signal, a transmission weight of the third artificial noise signal to the receiving end device in the (n+1)th time slot, so that the third artificial noise signal is in the receiving The interference power of the end device is minimum;

The nth time slot is a current time slot, the (n+1)th time slot is a next time slot of the current time slot, and the n is a positive integer.

In an optional implementation manner, the feedback signal further includes a control signal, and the adjusting unit adjusts the (n+1)th time slot to send the third artificial noise signal to the receiving end device according to the feedback signal. The transmission weights include:

Decoding the feedback signal to obtain a control signal carried by the feedback signal;

And transmitting, according to the control signal, a transmission weight of the third artificial noise signal to the receiving end device in the (n+1)th time slot.

In an optional implementation manner, the first signal further includes confidential information, where the secret information sent by each of the transmitting end devices is the same and the transmitting power of the secret information is the same for the same time slot. And transmitting, by each of the transmitting end devices, the transmit power of the artificial noise signal is the same, and the sum of the transmit power of the secret information and the transmit power of the artificial noise signal is less than or equal to At the preset threshold.

A fourth aspect of the embodiments of the present invention discloses a distributed security beamforming device, which is implemented on a receiving end device included in a distributed secure communication system, and includes:

a receiving unit, configured to receive, by the nth time slot, a plurality of first signals sent by the transmitting end device, where the first signal includes a first artificial noise signal, where the first artificial noise signal is used to interfere with the eavesdropping end The accuracy of the device's estimation of the first channel direction information;

a determining unit, configured to determine a feedback signal according to the plurality of the first signals, wherein the feedback signal includes a second artificial noise signal, where the second artificial noise signal is used to interfere with the eavesdropping device to the second channel The estimated accuracy of the direction information, the feedback signal is used by the transmitting end device to adjust the (n+1) time slot to transmit the transmission weight of the third artificial noise signal to the receiving end device;

And a sending unit, configured to send the feedback signal to a plurality of the transmitting end devices.

As an optional implementation manner, the determining unit, according to the plurality of the first signals, determining the feedback signal includes:

Determining, according to the plurality of the first signals, a first signal to interference and noise ratio SINR of the receiving end device in an nth time slot;

Comparing the first SINR with the stored second SINR of the nth slot to obtain a comparison result;

Based on the comparison result, a feedback signal is determined.

Compared with the prior art, the embodiment of the invention has the following beneficial effects:

In the embodiment of the present invention, the transmitting end device may send the first signal carrying the first artificial noise signal to the receiving end device in the nth time slot, where the first artificial noise signal is used to interfere with the eavesdropping device pair. The estimation accuracy of the first channel direction information; further, the transmitting end device may receive the feedback signal returned by the receiving end device for the plurality of the first signals, where the feedback signal includes a second artificial noise signal, where The artificial noise signal is used to interfere with the estimation accuracy of the second channel direction information by the eavesdropping device; further, the transmitting device may adjust the (n+1)th slot to the receiving according to the feedback signal. The end device sends a transmission weight of the third artificial noise signal to minimize the interference power of the third artificial noise signal at the receiving end device; wherein the nth time slot is a current time slot, the first n+1) the time slot is the next time of the current time slot The gap is n, which is a positive integer. It can be seen that, in the embodiment of the present invention, the transmitting end device may send the first artificial noise signal to the receiving end device to interfere with the estimation accuracy of the first channel direction information by the eavesdropping device, and the receiving end device may transmit to the transmitting end. The device sends a feedback signal carrying the second artificial noise signal to interfere with the estimation accuracy of the second channel direction information by the eavesdropping device, and the transmitting device can adjust the (n+1) according to the feedback signal. The time slot transmits the transmission weight of the third artificial noise signal to the receiving end device, so that the interference power of the third artificial noise signal at the receiving end device is minimized, thereby improving the security performance of the communication system.

DRAWINGS

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings to be used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Those skilled in the art can also obtain other drawings based on these drawings without paying any creative work.

1 is a schematic diagram of a model of a distributed secure communication system according to an embodiment of the present invention;

2 is a schematic flow chart of a distributed safety beamforming method based on artificial noise according to an embodiment of the present invention;

3 is a schematic flow chart of another distributed safety beamforming method based on artificial noise according to an embodiment of the present invention;

4 is a schematic flow chart of another distributed safety beamforming method based on artificial noise according to an embodiment of the present invention;

FIG. 5 is a schematic diagram of convergence of an artificial noise signal under different estimation errors according to an embodiment of the present invention; FIG.

6 is a schematic diagram of convergence of a security capacity of a distributed secure communication system according to an embodiment of the present invention;

7 is a schematic structural diagram of a distributed safety beamforming device according to an embodiment of the present invention;

FIG. 8 is a schematic structural diagram of another distributed safety beamforming apparatus according to an embodiment of the present invention.

Detailed ways

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

It should be noted that the terms "first", "second", "third" and the like in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish different objects, and are not intended to describe a specific order. Furthermore, the terms "comprises" and "comprising" and "comprising" are intended to cover a non-exclusive inclusion. For example, a process, method, system, product, or device that comprises a series of steps or units is not limited to the listed steps or units, but optionally also includes steps or units not listed, or, optionally, Other steps or units inherent to these processes, methods, products or equipment.

The embodiment of the invention discloses a distributed safety beamforming method and device based on artificial noise, which can minimize the interference power of the artificial noise signal transmitted by the transmitting device at the receiving end device and improve the security performance of the communication system. The details are described below in conjunction with the drawings.

In the embodiment of the present invention, the user equipment may include, but is not limited to, a smart phone, a notebook computer, a personal computer (PC), a personal digital assistant (PDA), a mobile internet device (MID), Wearable devices (such as smart watches, smart bracelets, smart glasses) and other electronic devices, wherein the operating system of the user device may include but is not limited to Android operating system, IOS operating system, Symbian (Saipan) operating system, Black The Berry (Blackberry) operating system, the Windows Phone 8 operating system, and the like are not limited in the embodiment of the present invention.

Referring to FIG. 1, FIG. 1 is a schematic diagram of a model of a distributed secure communication system according to an embodiment of the present invention. As shown in FIG. 1, the distributed secure communication system includes a plurality of transmitting end devices S _i (i=1, 2, 3....N, and N is a positive integer), a receiving end device D, and a eavesdropping device E. . Each of the transmitting end devices S _i and the receiving end device D is equipped with a single antenna, and the eavesdropping device E is equipped with multiple antennas.

The transmitting device S _{i is} mainly used for transmitting and receiving signals, such as transmitting an artificial noise signal and receiving a feedback signal, and the transmitting device S _i may be a base station. A base station (e.g., an access point) can refer to a device in an access network that communicates with a wireless terminal over one or more sectors over an air interface. The base station can be used to convert the received air frame to the IP packet as a router between the wireless terminal and the rest of the access network, wherein the remainder of the access network can include an Internet Protocol (IP) network. The base station can also coordinate attribute management of the air interface. For example, the base station may be a base station (BTS, Base Transceiver Station) in GSM or CDMA, or may be a base station (NodeB) in WCDMA, or may be an evolved base station in LTE (NodeB or eNB or e-NodeB, evolutional Node B), the embodiment of the present invention is not limited.

The receiving device D is mainly used for transmitting and receiving signals, such as transmitting an artificial noise signal and receiving a useful signal, and the target device D may be a base station.

The eavesdropping device E is mainly used for monitoring the signal sent by the transmitting end device S _i to the receiving end device D, and monitoring the signal sent by the receiving end device D to the transmitting end device S _i , and adjusting its own beamforming according to the received signal. The eavesdropping device E may include, but is not limited to, a base station, a user equipment, a communication vehicle, and the like.

因此，第i个发射端设备到接收端设备D的自由空间路径损耗为

式中λ表示载波波长，

表示第i个发射端设备到接收端设备D的距离。

表示第i个发射端设备到接收端设备D的信道衰落。

表示第i个发射端设备到窃听端设备E的自由空间路径损耗，式中

表示第i个发射端设备到窃听端设备E的距离，

表示第i个发射端设备到窃听端设备E的信道衰落。L_DE＝λ/4πd_DE表示接收端设备D与窃听端设备E之间的自由空间路径损耗，

则表示接收端设备D与窃听端设备E之间的距离。h_DE则表示接收端设备D与窃听端设备E之间的信道衰落。类似于以上的定义方法，

分别表示接收端设备D在发送反馈信号时与第i个发射端设备间的自由空间路径损耗、距离以及信道衰落。In the distributed secure communication system shown in FIG. 1, the coordinates of the receiving device D are represented as (0, r _D ), and the coordinates of the eavesdropping device E are expressed as (r _E sin θ _E , r _E cos θ _E ), where θ _E represents the angle between the eavesdropping device E and the y-axis at the coordinates shown in FIG. N distributed transmitting devices that have been frequency-synchronized are randomly distributed in a circle with a radius of r _S , and the distribution rules of these transmitting devices are uniformly distributed, that is, each distributed transmitting device appears at any position in the circle. The probability is the same. The coordinates of the i-th transmitting end device S _i (i=1, 2, K, N) can be expressed as

Therefore, the free space path loss of the i-th transmitting end device to the receiving end device D is

Where λ represents the carrier wavelength,

Indicates the distance from the i-th transmitter device to the sink device D.

Indicates channel fading from the i-th transmitter device to the sink device D.

Indicates the free space path loss of the i-th transmitter device to the eavesdropping device E,

Indicates the distance from the i-th transmitter device to the eavesdrop device E.

Indicates the channel fading of the i-th transmitter device to the eavesdropping device E. L _DE = λ / 4πd _DE represents the free space path loss between the receiving device D and the eavesdropping device E,

It represents the distance between the receiving device D and the eavesdropping device E. h _DE represents the channel fading between the receiving device D and the eavesdropping device E. Similar to the above definition method,

It indicates the free space path loss, distance, and channel fading between the receiving device D and the ith transmitting device when transmitting the feedback signal, respectively.

Wherein, any of the distributed transmitting end devices S _i (i=1, 2, K, N) and the receiving end device D are equipped with an omnidirectional single antenna, and the eavesdropping device E is equipped with a multi-antenna array to obtain more Channel direction information, thereby improving the eavesdropping capacity of the eavesdropping device E itself, for example by estimating the Direction of Arrival between the distributed transmitting device and the receiving device D to design its own beamformer.

In the distributed secure communication system shown in FIG. 1, each transmitting end device may send a first signal carrying a first artificial noise signal to the receiving end device in an nth time slot, the first artificial noise signal. The method is configured to interfere with the estimation accuracy of the first channel direction information by the eavesdropping device; after receiving the first signal that is sent by each transmitting device and carrying the first artificial noise signal, the receiving device may perform the first signal according to the first signal. Sending, to the transmitting end device, a feedback signal carrying a second artificial noise signal, the second artificial noise signal is used to interfere with the estimation accuracy of the second channel direction information by the eavesdropping device; and the transmitting device receives the receiving After the end device returns a feedback signal for the plurality of the first signals, adjusting, according to the feedback signal, the (n+1)th time slot to transmit a transmission weight of the third artificial noise signal to the receiving end device, so that The third artificial noise signal has the least interference power at the receiving end device, thereby improving the security of the distributed secure communication system.

Please refer to FIG. 2. FIG. 2 is a schematic flowchart diagram of a distributed safety beamforming method based on artificial noise according to an embodiment of the present invention. The distributed safety beamforming method based on artificial noise is applied to a transmitting end device included in the distributed secure communication system. As shown in FIG. 2, the artificial noise-based distributed safety beam forming method may include the following steps:

Step 201: The transmitting device sends a first signal carrying the first artificial noise signal to the receiving end device in the nth time slot.

The first artificial noise signal is used to interfere with the estimation accuracy of the first channel direction information by the eavesdropping device; the nth time slot is a current time slot, and the n is a positive integer.

The first signal further includes secret information, wherein, for the same time slot, the secret information sent by each of the transmitting end devices is the same and the transmitting power of the secret information is the same, and each of the transmitting ends is The transmitting power of the first artificial noise signal sent by the device is the same, and the sum of the transmitting power of the secret information and the transmitting power of the first artificial noise signal is less than or equal to a preset threshold.

In the embodiment of the present invention, the transmitting, by the transmitting device, the first signal carrying the first artificial noise signal to the receiving device in the nth time slot may be expressed as:

表示第i个分布式发射端设备发送保密信息的功率，

表示第i个分布式发射端设备发送的第一人造噪声信号，它服从均值为0，方差为1的高斯分布，

表示第i个发射端设备发送第一人造噪声

的功率。其中，所有分布式发射端设备在每一个时隙内发送保密信息x_C[n]的功率相同，发送第一人造噪声ξ_S,i[n]的功率相同，且它们满足如下条件：Where x _C [n] represents the secret information transmitted in the nth time slot, and the secret information transmitted by each distributed transmitting end device in each time slot is the same.

Indicates the power of the i-th distributed transmitting device to send confidential information.

Representing the first artificial noise signal transmitted by the ith distributed transmitting device, which obeys a Gaussian distribution with a mean of 0 and a variance of 1.

Indicates that the i-th transmitting device sends the first artificial noise

Power. Among them, all distributed transmitting devices transmit the same power of the secret information x _C [n] in each time slot, and transmit the first artificial noise ξ _{S, i} [n] have the same power, and they satisfy the following conditions:

功率之和的上限。

表示第i个分布式发射端设备发送第一人造噪声ξ_S,i[n]的发射权值。当对每一个分布式发射端设备的发射相位进行优化时，该发射权值可表示为

Where P _T indicates that each distributed transmitting device transmits confidential information x _C [n] and the first artificial noise

The upper limit of the sum of power.

Indicates the transmission weight of the first artificial transmitting device 发送_S,i [n] transmitted by the i-th distributed transmitting device. When the transmit phase of each distributed transmitting device is optimized, the transmit weight can be expressed as

Step 202: The transmitting end device receives a feedback signal returned by the receiving end device for a plurality of the first signals.

The feedback signal includes a second artificial noise signal, and the second artificial noise signal is used to interfere with the estimation accuracy of the second channel direction information by the eavesdropping device.

The feedback signal received by the i-th distributed transmitting device S _i can be expressed as:

P_C2表示接收端设备D反馈单比特控制信号x_B[n]的发射功率，P_ξ2表示接收端设备D发射第二人工噪声信号ξ_D[n]的功率，ξ_D[n]～CN(0,1)。

表示接收端设备D与第i个分布式发射端设备S_i之间的未知相位，它服从[0,2π)间的均匀分布，

表示接收端设备D与第i个分布式发射端设备S_i之间反馈控制信号时信道的相位响应，

表示第i个分布式发射端设备上的加性高斯白噪声。Where x _D [n] is a feedback signal determined by the receiving device,

P _C2 indicates that the receiving device D feeds back the transmission power of the single bit control signal x _B [n], and P _{ξ 2} indicates the power of the receiving device D to transmit the second artificial noise signal ξ _D [n], ξ _D [n] to CN ( 0,1).

Denote the unknown phase between the receiving device D and the ith distributed transmitting device S _i , which obeys a uniform distribution between [0, 2π),

Indicates the phase response of the channel when the control signal is fed back between the receiving device D and the i-th distributed transmitting device S _i ,

Represents additive white Gaussian noise on the ith distributed transmitter device.

Optionally, while the receiving device D receives the secret information, the eavesdropping device E is also stealing the secret information. When the eavesdropping device E is equipped with the M receiving antennas, the receiving vector of the eavesdropping device E can be expressed as:

表示第i个发射端设备S_i到窃听端设备E的到达角，

表示窃听端设备E上对应的天线导向矢量(Steering Vector)。

表示第i个分布式发射端设备S_i与窃听端设备E之间的未知相位，

表示第i个分布式发射端设备S_i与窃听端设备E之间的相位响应。

是窃听端设备E上的接收噪声矢量，它服从分布ε_E1[n]～CN(0,Φ_E1)，其中Φ_E1∈□^M×M是对角矩阵，主对线上的每一个元素代表窃听端设备E每一根接收天线上加性高斯白噪声的方差。窃听端设备E装备多天线时，可以根据零陷角度的方向对接收信号y_E1[n]建立波束成型器，且输出可以表示为：among them

Representing the angle of arrival of the i-th transmitting device S _i to the eavesdropping device E,

Indicates the corresponding antenna steering vector (Steering Vector) on the eavesdropping device E.

Indicates an unknown phase between the i-th distributed transmitting device S _i and the eavesdropping device E,

Indicates the phase response between the i-th distributed transmitting device S _i and the eavesdropping device E.

Is the received noise vector on the eavesdropping device E, which obeys the distribution ε _E1 [n] ~ CN (0, Φ _E1 ), where Φ _E1 ∈ □ ^{M × M} is a diagonal matrix, each element on the main pair is represented The variance of the additive white Gaussian noise on each of the receiving antennas of the eavesdropping device E. When the eavesdropping device E is equipped with multiple antennas, the beamformer can be established according to the direction of the null angle to the received signal y _E1 [n], and the output can be expressed as:

其中，

为窃听端设备上接收到的人工噪声信号的零陷角度，θ为固定值，

为对

的估计误差。Where w ₁ ∈ □ ^{M × 1} represents the weight vector of the beamformer on the eavesdropping device E, w ₁ corresponds to

among them,

In order to eavesdrop the angle of the artificial noise signal received on the end device, θ is a fixed value.

Right

Estimated error.

According to the received signal on the eavesdropping end E, the interception end E can receive the signal to interference and noise ratio in the first stage. Expressed as:

The eavesdropping capacity R _E [n] of the eavesdropping end E in the first stage can be expressed as:

R _E [n]=log ₂ (1+SINR _E1 [n])

The eavesdropping capacity R _E [n] is the amount of mutual information between the transmitting device and the eavesdropping device.

的估计准确度。It can be seen that the eavesdropping capacity R _E [n] on the listening device E mainly depends on the null angle of the first artificial noise signal generated by the listening device E for all distributed transmitting devices in the nth time slot.

Estimated accuracy.

Step 203: The transmitting end device adjusts, according to the feedback signal, a transmission weight of the third artificial noise signal to the receiving end device in the (n+1)th time slot, so that the third artificial noise signal is in the The interference power of the receiving device is the smallest.

The (n+1)th slot is the next slot of the current slot, and the n is a positive integer. The transmission power of the third artificial noise signal sent by each of the transmitting end devices is the same for the same time slot.

Specifically, the feedback signal further includes a control signal, and the transmitting end device adjusts, according to the feedback signal, the transmission weight of the third artificial noise signal sent by the (n+1)th time slot to the receiving end device, including:

Decoding the feedback signal to obtain a control signal carried by the feedback signal;

And transmitting, according to the control signal, a transmission weight of the third artificial noise signal to the receiving end device in the (n+1)th time slot.

后，需要对其进行解码，从而获得接收端设备D反馈的单比特控制信号

以此来控制每个分布式发射端设备在第(n+1)时隙向所述接收端设备发送第三人造噪声

时的发射权值

以使所述第三人工噪声信号在所述接收端设备的干扰功率最小。其中

表示单比特控制信号x_B的解码误差。 In this embodiment, each distributed transmitting device receives a feedback signal

After that, it needs to be decoded to obtain a single-bit control signal fed back by the receiving device D.

In this way, each distributed transmitting device is controlled to send a third artificial noise to the receiving device in the (n+1)th time slot.

Emission weight

So that the interference power of the third artificial noise signal at the receiving end device is minimized. among them

Represents the decoding error of the single bit control signal x _B .

The method described in FIG. 2, the transmitting end device may send, to the receiving end device, a first signal carrying a first artificial noise signal, where the first artificial noise signal is used to interfere with the method. The estimation accuracy of the first channel direction information by the eavesdropping device; further, the transmitting end device may receive the feedback signal returned by the receiving end device for the plurality of the first signals, where the feedback signal includes the second artificial noise signal The second artificial noise signal is used to interfere with the estimation accuracy of the second channel direction information by the eavesdropping device; further, the transmitting end device may adjust the (n+1)th time slot according to the feedback signal. Transmitting, by the receiving end device, a transmission weight of the third artificial noise signal, so that the interference power of the third artificial noise signal at the receiving end device is minimum; wherein the nth time slot is a current time slot, The (n+1)th slot is the next slot of the current slot, and the n is a positive integer. It can be seen that, in the embodiment of the present invention, the transmitting end device may send the first artificial noise signal to the receiving end device to interfere with the estimation accuracy of the first channel direction information by the eavesdropping device, and the receiving end device may transmit to the transmitting end. The device sends a feedback signal carrying the second artificial noise signal to interfere with the estimation accuracy of the second channel direction information by the eavesdropping device, and the transmitting device can adjust the (n+1) according to the feedback signal. The time slot transmits the transmission weight of the third artificial noise signal to the receiving end device, so that the interference power of the third artificial noise signal at the receiving end device is minimized, thereby improving the security performance of the communication system.

Please refer to FIG. 3. FIG. 3 is a schematic flowchart diagram of another distributed safety beamforming method based on artificial noise according to an embodiment of the present invention. The distributed safety beamforming method based on artificial noise is applied to a receiving end device included in the distributed safety communication system. As shown in FIG. 3, the artificial noise-based distributed safety beamforming method may include the following steps:

Step 301: The receiving end device receives, in the nth time slot, a plurality of first signals sent by the transmitting end device.

Wherein the first signal comprises a first artificial noise signal. The first artificial noise signal is used to interfere with the estimation accuracy of the first channel direction information by the eavesdropping device.

In the embodiment of the present invention, the transmitting, by the transmitting device, the first signal carrying the first artificial noise signal to the receiving device in the nth time slot may be expressed as:

表示第i个分布式发射端设备发送保密信息的功率，

表示第i个分布式发射端设备发送的第一人造噪声信号，它服从均值为0，方差为1的高斯分布，

表示第i个发射端设备发送第一人造噪声

的功率。其中，所有分布式发射端设备在每一个时隙内发送保密信息x_C[n]的功率相同，发送第一人造噪声ξ_S,i[n]的功率相同，且它们满足如下条件：Where x _C [n] represents the secret information transmitted in the nth time slot, and the secret information transmitted by each distributed transmitting end device in each time slot is the same.

Indicates the power of the i-th distributed transmitting device to send confidential information.

Representing the first artificial noise signal transmitted by the ith distributed transmitting device, which obeys a Gaussian distribution with a mean of 0 and a variance of 1.

Indicates that the i-th transmitting device sends the first artificial noise

Power. Among them, all distributed transmitting devices transmit the same power of the secret information x _C [n] in each time slot, and transmit the first artificial noise ξ _{S, i} [n] have the same power, and they satisfy the following conditions:

表示第i个分布式发射端设备发送第一人造噪声ξ_S,i[n]的发射权值。当对每一个分布式发射端设备的发射相位进行优化时，该发射权值可表示为

Where P _T represents the upper limit of the sum of the power of the secret information x _C [n] and the first artificial noise ξ _{S, i} [n] transmitted by each distributed transmitting device.

Indicates the transmission weight of the first artificial transmitting device 发送_S,i [n] transmitted by the i-th distributed transmitting device. When the transmit phase of each distributed transmitting device is optimized, the transmit weight can be expressed as

In the embodiment of the present invention, the receiving end device receives, in the nth time slot, a plurality of first signals sent by the transmitting end device, which may be represented as

表示合法接收端D上的加性高斯白噪声(Additive White Gaussian Noise)，

表示第i个分布式发射节点S_i与合法接收端D之间的未知相位，它服从[0,2π)间的均匀分布，

表示第i个发射节点S_i与合法接收端D之间第一阶段信道的相位响应。among them

Indicates Additive White Gaussian Noise on the legal receiver D.

Representing the unknown phase between the i-th distributed transmitting node S _i and the legal receiving end D, which obeys a uniform distribution between [0, 2π),

Indicates the phase response of the first phase channel between the i-th transmitting node S _i and the legal receiving end D.

The signal to interference and noise ratio of the receiving device in the nth time slot can be expressed as:

The amount of mutual information R _D [n] between the transmitting device and the receiving device in the nth time slot can be expressed as:

R _D [n]=log ₂ (1+SINR _D [n])

The safety capacity R _S [n] on the receiving device D can be expressed as:

R _S [n]=[R _D [n]-R _E [n]] ⁺

Where [x] ⁺ □max{0, x}, that is, the safe capacity R _S ≥ 0 achievable on the legal receiving device D.

Step 302: The receiving end device determines a feedback signal according to the plurality of the first signals.

The feedback signal includes a second artificial noise signal, and the second artificial noise signal is used to interfere with the estimation accuracy of the second channel direction information by the eavesdropping device, and the feedback signal is used by the transmitting device. Adjusting the (n+1)th time slot to transmit the transmission weight of the third artificial noise signal to the receiving end device.

Specifically, the receiving end device determines, according to the multiple first signals, that the feedback signal includes:

Determining, according to the plurality of the first signals, a first signal to interference and noise ratio SINR of the receiving end device in an nth time slot;

Comparing the first SINR with the stored second SINR of the nth slot to obtain a comparison result;

Based on the comparison result, a feedback signal is determined.

In the embodiment of the present invention, after the receiving end device determines the first signal to interference and noise ratio SINR in the nth time slot, the receiving end device may perform the first SINR and the stored second SINR of the nth time slot. Comparing, obtaining a comparison result, if the comparison result indicates that the first SINR is greater than the second SINR, determining a feedback signal for indicating that the first SINR is compared to the second SINR, and if the comparison result indicates If the first SINR is less than or equal to the second SINR, determining a feedback signal for indicating that the first SINR is not boosted compared to the second SINR.

Specifically, the feedback signal determined by the receiving device can be expressed as:

Wherein P _C2 indicates that the receiving device D feeds back the transmission power of the single bit control signal x _B [n], and P _ξ2 indicates that the receiving device D transmits the power of the second artificial noise signal ξ _D [n], ξ _D [n]～CN (0,1). The receiving end device only needs to feed back a single-bit control signal, which can save network resources.

Optionally, the artificial noise-based distributed safety beamforming method may further include:

The receiving end device stores the SINR of the first SINR and the second SINR as the SINR of the (n+1)th slot of the receiving end device; wherein the (n+1)th slot Is the next time slot of the current time slot.

Step 303: The receiving end device sends the feedback signal to a plurality of the transmitting end devices.

The method described in FIG. 3, the receiving end device may receive a plurality of first signals sent by the transmitting end device in an nth time slot, and determine a feedback signal according to the plurality of the first signals, where The feedback signal includes a second artificial noise signal, the second artificial noise signal is used to interfere with the estimation accuracy of the second channel direction information by the eavesdropping device, and the feedback signal is used by the transmitting device to adjust the Sending a transmission weight of the third artificial noise signal to the receiving end device to minimize the interference power of the third artificial noise signal at the receiving end device, thereby improving the distributed secure communication system Security.

Referring to FIG. 4, FIG. 4 is a schematic flowchart diagram of another distributed safety beamforming method based on artificial noise disclosed in an embodiment of the present invention. The distributed safety beamforming method based on artificial noise is described from both the transmitting end device and the receiving end device. Some or all of the steps in FIG. 4 can be referred to the description in FIG. 2 or FIG. 3, and Let me repeat. As shown in FIG. 4, the artificial noise-based distributed safety beamforming method may include the following steps:

Step 401: The transmitting device sends a first signal carrying the first artificial noise signal to the receiving end device in the nth time slot.

Step 402: The receiving end device determines a feedback signal according to the plurality of the first signals.

Step 403: The receiving end device sends the feedback signal to a plurality of the transmitting end devices.

Step 404: The transmitting device adjusts, according to the feedback signal, a transmission weight of the third artificial noise signal to the receiving end device in the (n+1)th time slot.

Referring to FIG. 5 and FIG. 6 , FIG. 5 is a schematic diagram of convergence of an artificial noise signal under different estimation errors according to an embodiment of the present invention; FIG. 6 is a distributed secure communication according to an embodiment of the present invention; Schematic diagram of the convergence of the system's confidential capacity. As shown in Figure 5 and Figure 6, the eavesdropping terminal The received signal strength (Resived Signal Strength, RSS) of the received artificial noise signal is different under different estimation errors. The larger the estimation error is, the larger the RSS is, and the easier it is to interfere with the estimation of the channel direction information by the eavesdropping device. The greater the security capacity of the distributed secure communication system, the higher the security of the distributed secure communication system.

In the method flow described in FIG. 4, each transmitting end device may send a first signal carrying a first artificial noise signal to the receiving end device in an nth time slot, where the first artificial noise signal is used for interference. The estimation accuracy of the first channel direction information by the eavesdropping device; after receiving the first signal carried by each transmitting device and carrying the first artificial noise signal, the receiving device may send the signal according to the first signal to the transmitting end. The device sends a feedback signal carrying a second artificial noise signal, where the second artificial noise signal is used to interfere with the estimation accuracy of the second channel direction information by the eavesdropping device; the transmitting device receives the receiving device for After the feedback signals returned by the plurality of first signals, adjusting, according to the feedback signal, the (n+1)th time slot to transmit a transmission weight of the third artificial noise signal to the receiving end device, so that the first The interference power of the three artificial noise signals at the receiving end device is minimized, so that the security of the distributed secure communication system can be improved.

Please refer to FIG. 7. FIG. 7 is a schematic structural diagram of a distributed safety beamforming apparatus according to an embodiment of the present invention. Wherein, the distributed safety beamforming device described in FIG. 7 can be implemented in a transmitting end device included in the distributed secure communication system, and the distributed safety beam forming device described in FIG. 7 can be used to perform the method described in FIG. 2 or FIG. For some or all of the steps in the distributed safety beamforming method based on the artificial noise, please refer to the related description in FIG. 2 or FIG. 4, and details are not described herein again. As shown in FIG. 7, the distributed safety beamforming device can include:

The sending unit 701 is configured to send, to the receiving end device, a first signal carrying a first artificial noise signal, where the first artificial noise signal is used to interfere with the eavesdropping device to the first channel direction. Estimated accuracy of the information;

The receiving unit 702 is configured to receive, by the receiving end device, a feedback signal returned by the first end signal, where the feedback signal includes a second artificial noise signal, where the second artificial noise signal is used to interfere with the eavesdropping end Estimating accuracy of the second channel direction information by the device;

The adjusting unit 703 is configured to adjust the (n+1)th slot to the receiving according to the feedback signal Transmitting, by the end device, a transmission weight of the third artificial noise signal, so that the interference power of the third artificial noise signal at the receiving end device is minimized;

The nth time slot is a current time slot, the (n+1)th time slot is a next time slot of the current time slot, and the n is a positive integer.

The adjusting unit 703 adjusts, according to the feedback signal, the transmission weight of the third artificial noise signal sent by the (n+1)th slot to the receiving end device, including:

Decoding the feedback signal to obtain a control signal carried by the feedback signal;

And transmitting, according to the control signal, a transmission weight of the third artificial noise signal to the receiving end device in the (n+1)th time slot.

The first signal further includes secret information, wherein, for the same time slot, the secret information sent by each of the transmitting end devices is the same and the transmitting power of the secret information is the same, and each of the transmitting ends is The transmitting power of the device transmitting the artificial noise signal is the same, and the sum of the transmitting power of the secret information and the transmitting power of the artificial noise signal is less than or equal to a preset threshold.

Wherein, the distributed security beamforming device described in FIG. 7 is implemented, and the transmitting device can send a first artificial noise signal to the receiving device to interfere with the estimation accuracy of the first channel direction information by the eavesdropping device, The receiving end device may send a feedback signal carrying the second artificial noise signal to the transmitting end device to interfere with the estimation accuracy of the second channel direction information by the eavesdropping device, and at the same time, the transmitting end device may according to the feedback signal. Adjusting (n+1) time slot to transmit a transmission weight of the third artificial noise signal to the receiving end device, so that the interference power of the third artificial noise signal at the receiving end device is minimum, thereby improving the communication system Confidential performance.

Please refer to FIG. 8. FIG. 8 is a schematic structural diagram of another distributed safety beamforming apparatus according to an embodiment of the present invention. Wherein, the distributed safety beamforming device depicted in FIG. 8 operates on a receiving end device included in the distributed secure communication system, and the distributed safety beamforming device described in FIG. 8 can be used to perform the method described in FIG. 3 or FIG. For some or all of the steps in the distributed safety beamforming method of the artificial noise, please refer to the related description in FIG. 3 or FIG. 4, and details are not described herein again. As shown in FIG. 8, the distributed safety beamforming device can include:

The receiving unit 801 is configured to receive, by using the nth time slot, the first message sent by the multiple sending end devices The first signal includes a first artificial noise signal, and the first artificial noise signal is used to interfere with an estimation accuracy of the first channel direction information by the eavesdropping device;

a determining unit 802, configured to determine a feedback signal according to the plurality of the first signals, where the feedback signal includes a second artificial noise signal, and the second artificial noise signal is used to interfere with the eavesdropping device to the second The estimation accuracy of the channel direction information, the feedback signal is used by the transmitting end device to adjust the (n+1) time slot to transmit the transmission weight of the third artificial noise signal to the receiving end device.

The determining unit 802 determines, according to the plurality of the first signals, that the feedback signal includes:

Determining, according to the plurality of the first signals, a first signal to interference and noise ratio SINR of the receiving end device in an nth time slot;

Comparing the first SINR with the stored second SINR of the nth slot to obtain a comparison result;

Based on the comparison result, a feedback signal is determined.

The receiving device can receive the first signal sent by the multiple transmitting device in the nth time slot, and determine the feedback according to the plurality of the first signals, in the distributed safety beamforming device described in FIG. a signal, wherein the feedback signal includes a second artificial noise signal, the second artificial noise signal is used to interfere with an estimation accuracy of the second channel direction information by the eavesdropping device, and the feedback signal is used for the transmitting The end device adjusts the (n+1)th time slot to transmit the transmission weight of the third artificial noise signal to the receiving end device, so as to minimize the interference power of the third artificial noise signal at the receiving end device, thereby improving The security of distributed secure communication systems.

In the above embodiments, the descriptions of the various embodiments are different, and the details that are not detailed in a certain embodiment can be referred to the related descriptions of other embodiments.

In the several embodiments provided herein, it should be understood that the disclosed apparatus may be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner, for example, multiple units or components may be combined or may be Integrate into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, It is electrical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above integrated unit can be implemented in the form of hardware or in the form of a software functional unit.

The integrated unit, if implemented in the form of a software functional unit and sold or used as a standalone product, may be stored in a computer readable memory. Based on such understanding, the technical solution of the present invention may contribute to the prior art or all or part of the technical solution may be embodied in the form of a software product stored in a memory. A number of instructions are included to cause a computer device (which may be a personal computer, server or network device, etc.) to perform all or part of the steps of the methods described in various embodiments of the present invention. The foregoing memory includes: a U disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic disk, or an optical disk, and the like, which can store program codes.

A person skilled in the art can understand that all or part of the steps of the foregoing embodiments can be completed by a program to instruct related hardware, and the program can be stored in a computer readable memory, and the memory can include: a flash drive , read-only memory (English: Read-Only Memory, referred to as: ROM), random accessor (English: Random Access Memory, referred to as: RAM), disk or CD.

The distributed safety beamforming method and device based on artificial noise disclosed in the embodiment of the present invention are described in detail. The principle and implementation manner of the present invention are described in the following. The description of the above embodiment is only The method for understanding the present invention and its core idea; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in specific embodiments and application scopes. The contents of the manual should not be understood as Limitations of the invention.

Claims (10)

A distributed safety beamforming method based on artificial noise, characterized in that it is applied to a transmitting end device included in a distributed secure communication system, and the distributed secure communication system includes a plurality of the transmitting end device and a receiving end device, and The eavesdropping device, the method comprising: Transmitting, by the nth time slot, the first signal carrying the first artificial noise signal to the receiving end device, where the first artificial noise signal is used to interfere with the estimation accuracy of the first channel direction information by the eavesdropping device; Receiving, by the receiving end device, a feedback signal returned by the plurality of the first signals, where the feedback signal includes a second artificial noise signal, where the second artificial noise signal is used to interfere with the eavesdropping device to the second channel direction Estimated accuracy of the information; And transmitting, according to the feedback signal, a transmission weight of the third artificial noise signal to the receiving end device in the (n+1)th time slot, so that the interference power of the third artificial noise signal at the receiving end device Minimum The nth time slot is a current time slot, the (n+1)th time slot is a next time slot of the current time slot, and the n is a positive integer. The method according to claim 1, wherein the feedback signal further comprises a control signal, and adjusting the (n+1)th time slot to transmit the third artificial noise to the receiving end device according to the feedback signal The transmission weights of the signal include: Decoding the feedback signal to obtain a control signal carried by the feedback signal; And transmitting, according to the control signal, a transmission weight of the third artificial noise signal to the receiving end device in the (n+1)th time slot. The method according to claim 1 or 2, wherein the first signal further comprises secret information, wherein, for the same time slot, the secret information sent by each of the transmitting devices is the same and the The transmission power of the secret information is the same, the transmission power of each of the transmitting end devices transmitting the artificial noise signal is the same, and the sum of the transmission power of the secret information and the transmission power of the artificial noise signal is less than or equal to a preset threshold. A distributed safety beamforming method based on artificial noise, which is characterized in that it is applied to a receiving end device included in a distributed secure communication system, and the distributed secure communication system further includes a plurality of transmitting end devices and a eavesdropping end device. The methods include: Receiving, by the nth time slot, a plurality of first signals sent by the transmitting end device, where the first signal includes a first artificial noise signal, where the first artificial noise signal is used to interfere with the eavesdropping device to the first channel Estimated accuracy of direction information; Determining a feedback signal according to the plurality of the first signals, wherein the feedback signal includes a second artificial noise signal, and the second artificial noise signal is used to interfere with the estimation of the second channel direction information by the eavesdropping device And the feedback signal is used by the transmitting end device to adjust a transmission weight of the third artificial noise signal sent by the (n+1)th time slot to the receiving end device; Transmitting the feedback signal to a plurality of the transmitting end devices. The method according to claim 4, wherein the determining the feedback signal according to the plurality of the first signals comprises: Determining, according to the plurality of the first signals, a first signal to interference and noise ratio SINR of the receiving end device in an nth time slot; Comparing the first SINR with the stored second SINR of the nth slot to obtain a comparison result; Based on the comparison result, a feedback signal is determined. A distributed safety beamforming device, characterized in that: the transmitting device included in the distributed secure communication system comprises: a sending unit, configured to send, to the receiving end device, a first signal carrying a first artificial noise signal, where the first artificial noise signal is used to interfere with the first channel direction information of the eavesdropping device Estimated accuracy; a receiving unit, configured to receive a feedback signal returned by the receiving end device for the plurality of the first signals, where the feedback signal includes a second artificial noise signal, where the second artificial noise signal is used to interfere with the eavesdropping device Estimating accuracy of the second channel direction information; And an adjusting unit, configured to adjust, according to the feedback signal, a transmission weight of the third artificial noise signal to the receiving end device in the (n+1)th time slot, so that the third artificial noise signal is in the receiving The interference power of the end device is minimum; The nth time slot is a current time slot, the (n+1)th time slot is a next time slot of the current time slot, and the n is a positive integer. The distributed safety beamforming apparatus according to claim 6, wherein the feedback signal further comprises a control signal, and the adjusting unit adjusts the (n+1)th time slot to the receiving according to the feedback signal The transmitting weight of the third artificial noise signal sent by the end device includes: Decoding the feedback signal to obtain a control signal carried by the feedback signal; And transmitting, according to the control signal, a transmission weight of the third artificial noise signal to the receiving end device in the (n+1)th time slot. The distributed safety beamforming apparatus according to claim 6 or 7, wherein the first signal further comprises secret information, wherein the secret sent by each of the transmitting devices is for the same time slot The information is the same and the transmission power of the secret information is the same, the transmission power of each of the transmitting end devices transmitting the artificial noise signal is the same, and the sum of the transmission power of the secret information and the transmission power of the artificial noise signal is less than or Equal to the preset threshold. A distributed safety beamforming device, characterized in that: the receiving end device included in the distributed secure communication system comprises: a receiving unit, configured to receive, by the nth time slot, a plurality of first signals sent by the transmitting end device, where the first signal includes a first artificial noise signal, where the first artificial noise signal is used to interfere with the eavesdropping end The accuracy of the device's estimation of the first channel direction information; a determining unit, configured to determine a feedback signal according to the plurality of the first signals, wherein the feedback signal includes a second artificial noise signal, where the second artificial noise signal is used to interfere with the eavesdropping device to the second channel The estimated accuracy of the direction information, the feedback signal is used by the transmitting end device to adjust the (n+1) time slot to transmit the transmission weight of the third artificial noise signal to the receiving end device; And a sending unit, configured to send the feedback signal to a plurality of the transmitting end devices. The distributed safety beamforming device according to claim 9, wherein the determining unit determines, according to the plurality of the first signals, the feedback signal comprises: Determining, according to the plurality of the first signals, a first signal to interference and noise ratio SINR of the receiving end device in an nth time slot; Comparing the first SINR with the stored second SINR of the nth slot to obtain a comparison result; Based on the comparison result, a feedback signal is determined.

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