CN107396307B - Mobile equipment position control method and device based on dynamic noise of channel information - Google Patents

Mobile equipment position control method and device based on dynamic noise of channel information Download PDF

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Publication number
CN107396307B
CN107396307B CN201710542124.6A CN201710542124A CN107396307B CN 107396307 B CN107396307 B CN 107396307B CN 201710542124 A CN201710542124 A CN 201710542124A CN 107396307 B CN107396307 B CN 107396307B
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capacity
mobile device
communication system
time slot
path loss
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CN107396307A (en
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谢宁
梁远
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Shenzhen University
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Shenzhen University
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W4/00—Services specially adapted for wireless communication networks; Facilities therefor
    • H04W4/02—Services making use of location information
    • H04W4/025—Services making use of location information using location based information parameters
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04W—WIRELESS COMMUNICATION NETWORKS
    • H04W12/00—Security arrangements; Authentication; Protecting privacy or anonymity
    • H04W12/02—Protecting privacy or anonymity, e.g. protecting personally identifiable information [PII]

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Computer Security & Cryptography (AREA)
  • Mobile Radio Communication Systems (AREA)

Abstract

The invention provides a mobile equipment position control method and a device based on dynamic noise of channel information, wherein the method comprises the following steps: determining a first trend of change of a first privacy capacity of the communication system at an (n +1) th time slot relative to a second privacy capacity of the communication system at an n-th time slot; determining a second trend of change of a first interception capacity of the mobile device at the (n +1) th time slot relative to a second interception capacity of the mobile device at the n-th time slot; and adjusting the transmission power of the target end equipment for transmitting the artificial noise signal according to the first change trend, the second change trend, the first path loss, the second path loss, the third path loss and the fourth path loss, and sending feedback information to the mobile equipment according to the first change trend so as to control the mobile position of the mobile equipment. The invention controls the mobile position of the mobile equipment according to the feedback information, and optimizes the secrecy capacity of the communication system by adaptively adjusting the power of the artificial noise signal, so that the safe communication is continuously carried out.

Description

Mobile equipment position control method and device based on dynamic noise of channel information
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a method and an apparatus for controlling a location of a mobile device based on dynamic noise of channel information.
Background
With the convenience brought by wireless communication, people will use a wireless network to transmit sensitive and private information in a large amount in daily life. Conventional wireless networks guarantee the security of information by means of high-level encryption techniques, which assume that the computational power of the eavesdropping end (i.e. the mobile device) is limited. However, with the rapid development of distributed computing, the computing power of the eavesdropping end is continuously increased, and the assumption has become more and more unreliable. The physical layer security technology receives more and more attention, and the legal target end equipment has better signal receiving quality (such as signal-to-noise ratio) than the eavesdropping end equipment so as to ensure the security of communication and avoid the assumption that the eavesdropping end is dependent on the limited computing capability.
The cooperative communication method in the existing physical layer security technology mainly comprises methods of relay selection, cooperative artificial noise and the like. Relay selection can improve privacy capacity by selecting relays to "strong" transmission links at a given destination end and "weak" transmission links at an eavesdropping end. However, the existing cooperative communication method also has obvious defects, such as that the performance of the relay selection method is limited by the spatial location of the relay.
Disclosure of Invention
The embodiment of the invention discloses a mobile equipment position control method and a mobile equipment position control device based on dynamic noise of channel information, which can control the mobile position of mobile equipment according to feedback information, and further optimize the secret capacity of a communication system by adaptively adjusting the power of an artificial noise signal so as to continuously carry out safe communication.
The first aspect of the embodiments of the present invention discloses a mobile device location control method based on dynamic noise of channel information, which is applied to a target device included in a communication system, where the communication system further includes the mobile device and a source device, and the method includes:
determining a first change trend of a first privacy capacity of the communication system at an (n +1) th time slot relative to a second privacy capacity of the communication system at an n time slot, wherein the second privacy capacity is an optimal privacy capacity of the communication system at the n time slot;
determining a second variation trend of a first interception capacity of the mobile device at an (n +1) th time slot relative to a second interception capacity of the mobile device at an nth time slot, wherein the second interception capacity is an optimal interception capacity of the mobile device at the nth time slot;
adjusting the transmission power of the target end equipment for transmitting the artificial noise signal according to the first variation trend, the second variation trend, the first path loss, the second path loss, the third path loss and the fourth path loss;
according to the first change trend, sending feedback information to the mobile equipment to control the mobile position of the mobile equipment, wherein the feedback information is used for indicating that the privacy capacity of the communication system is improved or reduced;
wherein the (n +1) th time slot is a current time slot, the nth time slot is a previous time slot of the current time slot, and n is a positive integer; the first path loss is a path loss generated by transmitting a signal between the source device and the mobile device at an (n +1) th time slot, the second path loss is a path loss generated by transmitting a signal between the mobile device and the target device at an (n +1) th time slot, the third path loss is a path loss generated by transmitting a signal between the source device and the mobile device at an nth time slot, and the fourth path loss is a path loss generated by transmitting a signal between the mobile device and the target device at an nth time slot.
As an optional implementation manner, in the first aspect of this embodiment of the present invention, the method further includes:
comparing the first security capacity with the second security capacity, and determining the security capacity with the larger value in the first security capacity and the second security capacity as the best security capacity of the communication system in the (n +1) th time slot; and
comparing the first interception capacity with the second interception capacity, and determining the interception capacity with a larger value in the first interception capacity and the second interception capacity as the optimal interception capacity of the communication system at the (n +1) th time slot;
and saving the optimal security capacity of the communication system in the (n +1) th time slot and the optimal interception capacity of the communication system in the (n +1) th time slot.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, the adjusting, according to the first variation trend, the second variation trend, the first path loss, the second path loss, the third path loss, and the fourth path loss, the transmission power of the target device for transmitting the artificial noise signal includes:
determining P if the first trend indicates an increase in security capacity of the communication system, and the second trend indicates that the eavesdropping capacity of the mobile device has not decreased, and the increase in security capacity of the communication system is greater than the increase in eavesdropping capacity of the mobile deviceD(n+1)＝PD(n)；
Determining that the security capacity of the communication system is increased if the first trend indicates that the security capacity of the communication system is increased and the second trend indicates that the eavesdropping capacity of the mobile device is not decreased and that the security capacity of the communication system is increased by an amount less than or equal to the eavesdropping capacity of the mobile device
Determining that the eavesdropping capacity of the mobile device is reduced if the first trend indicates an increase in the privacy capacity of the communication system and the second trend indicates a decrease in the eavesdropping capacity of the mobile device
If the first change trend indicates that the privacy capacity of the communication system is not improved, determining that the privacy capacity of the communication system is not improved
Wherein, the PD(n +1) is the transmission power of the target end equipment for transmitting the artificial noise signal in the (n +1) th time slot, and P isD(n) transmitting the transmission power of the artificial noise signal in the nth time slot for the target end equipment; said LR,D(n) is the fourth path loss, LS,R(n) is the third path loss, LS,R(n +1) is the first path loss, LR,D(n +1) is the second path loss.
As an optional implementation manner, in the first aspect of the embodiment of the present invention, before determining a first trend of a first privacy capacity of the communication system at an (n +1) th time slot relative to a second privacy capacity of the communication system at an n th time slot, the method further includes:
transmitting the artificial noise signal to the mobile device;
receiving a processing signal forwarded by the mobile device, where the processing signal is a signal obtained by processing the artificial noise signal and a useful signal received from the source device at the same time by the mobile device;
obtaining the useful signal from the processed signal.
The second aspect of the embodiment of the present invention discloses a mobile device location control method based on dynamic noise of channel information, which is applied to a mobile device included in a communication system, wherein the communication system further includes a source device and a target device, and the method includes:
receiving a useful signal sent by the source end device and an artificial noise signal sent by the target end device at the same time;
processing the useful signal and the artificial noise signal to obtain a processed signal, and forwarding the processed signal to the target end equipment;
receiving feedback information returned by the target end equipment aiming at the processing signal, wherein the feedback information is used for representing the increase or decrease of the security capacity of the communication system;
and determining a mobile position according to the feedback information and the interception capacity of the mobile equipment, and moving from the current position of the mobile equipment to the mobile position.
As an optional implementation manner, in the second aspect of the embodiment of the present invention, the determining a mobile location according to the feedback information and the eavesdropping capacity of the mobile device includes:
if the feedback information is used for indicating that the privacy capacity of the communication system is improved and the interception capacity of the mobile equipment is not reduced, increasing the current moving step length to a first moving step length; determining a moving position according to the current position of the mobile equipment and the first moving step length;
if the feedback information is used for indicating that the privacy capacity of the communication system is reduced, reducing the current moving step length to a second moving step length; and determining the moving position according to the current position of the mobile equipment and the second moving step length.
A third aspect of the embodiments of the present invention discloses a mobile device location control apparatus, which is operated in a target device included in a communication system, and includes:
a determining unit, configured to determine a first trend of a first privacy capacity of the communication system at an (n +1) th time slot relative to a second privacy capacity of the communication system at an nth time slot, where the second privacy capacity is an optimal privacy capacity of the communication system at the nth time slot;
the determining unit is further configured to determine a second variation trend of a first eavesdropping capacity of the mobile device at an (n +1) th time slot relative to a second eavesdropping capacity of the mobile device at an nth time slot, where the second eavesdropping capacity is an optimal eavesdropping capacity of the mobile device at the nth time slot;
the adjusting unit is used for adjusting the transmission power of the target end equipment for transmitting the artificial noise signal according to the first change trend, the second change trend, the first path loss, the second path loss, the third path loss and the fourth path loss;
a first sending unit, configured to send feedback information to the mobile device according to the first variation trend to control a moving position of the mobile device, where the feedback information is used to indicate that a privacy capacity of the communication system is increased or decreased;
wherein the (n +1) th time slot is a current time slot, the nth time slot is a previous time slot of the current time slot, and n is a positive integer; the first path loss is a path loss generated by transmitting a signal between the source device and the mobile device at an (n +1) th time slot, the second path loss is a path loss generated by transmitting a signal between the mobile device and the target device at an (n +1) th time slot, the third path loss is a path loss generated by transmitting a signal between the source device and the mobile device at an nth time slot, and the fourth path loss is a path loss generated by transmitting a signal between the mobile device and the target device at an nth time slot.
As an optional implementation manner, in the third aspect of the embodiment of the present invention, the mobile device position control apparatus further includes:
a comparison determination unit configured to compare the first secret capacity with the second secret capacity, and determine a secret capacity with a larger value of the first secret capacity and the second secret capacity as a best secret capacity of the communication system in an (n +1) th timeslot;
the comparison and determination unit is further configured to compare the first eavesdropping capacity with the second eavesdropping capacity, and determine the eavesdropping capacity with a larger value of the first eavesdropping capacity and the second eavesdropping capacity as the optimal eavesdropping capacity of the communication system at the (n +1) th timeslot;
a holding unit, configured to hold the optimal privacy capacity of the communication system at the (n +1) th time slot and the optimal eavesdropping capacity of the communication system at the (n +1) th time slot.
As an optional implementation manner, in the third aspect of the embodiment of the present invention, the adjusting unit adjusts, according to the first variation trend, the second variation trend, the first path loss, the second path loss, the third path loss, and the fourth path loss, a manner of adjusting the transmission power of the artificial noise signal transmitted by the target end device is specifically:
determining P if the first trend indicates an increase in security capacity of the communication system, and the second trend indicates that the eavesdropping capacity of the mobile device has not decreased, and the increase in security capacity of the communication system is greater than the increase in eavesdropping capacity of the mobile deviceD(n+1)＝PD(n)；
Determining that the security capacity of the communication system is increased if the first trend indicates that the security capacity of the communication system is increased and the second trend indicates that the eavesdropping capacity of the mobile device is not decreased and that the security capacity of the communication system is increased by an amount less than or equal to the eavesdropping capacity of the mobile device
Determining that the eavesdropping capacity of the mobile device is reduced if the first trend indicates an increase in the privacy capacity of the communication system and the second trend indicates a decrease in the eavesdropping capacity of the mobile device
If the first change trend indicates that the privacy capacity of the communication system is not improved, determining that the privacy capacity of the communication system is not improved
Wherein, the PD(n +1) is the transmission power of the target end equipment for transmitting the artificial noise signal in the (n +1) th time slot, and P isD(n) transmitting the transmission power of the artificial noise signal in the nth time slot for the target end equipment; said LR,D(n) is the fourth path loss, LS,R(n) is the third path loss, LS,R(n +1) is the first path loss, LR,D(n +1) is the second path loss.
As an optional implementation manner, in the third aspect of the embodiment of the present invention, the mobile device position control apparatus further includes:
a second transmitting unit configured to transmit the artificial noise signal to the mobile device before the determining unit determines a first trend of change of the first privacy capacity of the communication system at the (n +1) th time slot with respect to a second privacy capacity of the communication system at the n-th time slot;
a receiving unit, configured to receive a processing signal forwarded by the mobile device, where the processing signal is a signal obtained by processing, by the mobile device, the artificial noise signal and a useful signal received from the source device at the same time;
an acquisition unit for obtaining the useful signal from the processed signal.
The embodiment of the invention discloses a mobile device position control device, which runs on a mobile device included in a communication system and comprises the following components:
a receiving unit, configured to receive, at the same time, a useful signal sent by the source device and an artificial noise signal sent by the target device;
the processing and sending unit is used for processing the useful signal and the artificial noise signal to obtain a processed signal and forwarding the processed signal to the target end equipment;
the receiving unit is further configured to receive feedback information returned by the target device for the processed signal, where the feedback information is used to indicate that the security capacity of the communication system is increased or decreased;
a determining unit for determining a mobile location according to the feedback information and the eavesdropping capacity of the mobile device;
and the mobile unit is used for moving from the current position of the mobile equipment to the moving position.
As an optional implementation manner, in the fourth aspect of the embodiment of the present invention, the manner in which the determining unit determines the mobile location according to the feedback information and the eavesdropping capacity of the mobile device is specifically:
if the feedback information is used for indicating that the privacy capacity of the communication system is improved and the interception capacity of the mobile equipment is not reduced, increasing the current moving step length to a first moving step length; determining a moving position according to the current position of the mobile equipment and the first moving step length;
if the feedback information is used for indicating that the privacy capacity of the communication system is reduced, reducing the current moving step length to a second moving step length; and determining the moving position according to the current position of the mobile equipment and the second moving step length.
Compared with the prior art, the embodiment of the invention has the following beneficial effects:
in this embodiment of the present invention, the target device may determine a first variation trend of a first privacy capacity of the communication system at an (n +1) th timeslot relative to a second privacy capacity of the communication system at an n th timeslot, and determine a second variation trend of a first eavesdropping capacity of the mobile device at the (n +1) th timeslot relative to a second eavesdropping capacity of the mobile device at the n th timeslot, and further, the target device may adjust a transmission power of the target device for transmitting the artificial noise signal according to the first variation trend, the second variation trend, the first path loss, the second path loss, the third path loss, and the fourth path loss, and send feedback information to the mobile device according to the first variation trend to control a moving position of the mobile device. Therefore, by implementing the embodiment of the present invention, the target device may adaptively adjust the power of the artificial noise signal according to the trend of change (increase or decrease) of the secret capacity of the communication system, the trend of change (increase or decrease) of the eavesdropping capacity of the mobile device, and the path loss of the signal during transmission, and send feedback information to the mobile device according to the first trend of change to control the mobile position of the mobile device, and at the same time, further optimize the secret capacity of the communication system by adaptively adjusting the power of the artificial noise signal, so that secure communication is continuously performed.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without creative efforts.
Fig. 1 is a schematic model diagram of a communication system according to an embodiment of the present invention;
fig. 2 is a flowchart illustrating a method for controlling a location of a mobile device based on dynamic noise of channel information according to an embodiment of the present invention;
fig. 3 is a flowchart illustrating another method for controlling a location of a mobile device based on dynamic noise of channel information according to an embodiment of the present invention;
fig. 4 is a flowchart illustrating another method for controlling a location of a mobile device based on dynamic noise of channel information according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating convergence of communication capacity, privacy capacity, and eavesdropping capacity according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a mobile device position control apparatus according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of another mobile device position control apparatus according to an embodiment of the disclosure;
fig. 8 is a schematic structural diagram of another mobile device position control apparatus according to an embodiment of the disclosure.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and 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, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that the terms "first", "second", "third" and "fourth", etc. in the description and claims of the present invention and the above-mentioned drawings are used for distinguishing different objects and are not used for describing a specific order. Furthermore, the terms "include" and "have," as well as any variations thereof, are intended to cover non-exclusive inclusions. For example, a process, method, system, article, or apparatus that comprises a list of steps or elements is not limited to only those steps or elements listed, but may alternatively include other steps or elements not listed, or inherent to such process, method, article, or apparatus.
The embodiment of the invention discloses a mobile equipment position control method and a mobile equipment position control device based on dynamic noise of channel information, which can adjust the power of an artificial noise signal in a self-adaptive mode to more flexibly control the mobile position of mobile equipment, further optimize the secret capacity of a communication system and enable safe communication to be continuously carried out. The following detailed description is made with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a schematic model diagram of a communication system according to an embodiment of the present invention. As shown in fig. 1, the communication system includes a source device S, a mobile device R, and a target device D, and optionally, may further include an eavesdropping device E.
The source device S is mainly used for transmitting a useful signal, and the source device S may include, but is not limited to, a base station and a user equipment. A base station (e.g., access point) can refer to a device in an access network that communicates over the air-interface, through one or more sectors, with wireless terminals. The base station may be configured to interconvert received air frames and IP packets as a router between the wireless terminal and the rest of the access network, which may include an Internet Protocol (IP) network. The base station may also coordinate management of attributes for the air interface. For example, the base Station may be a Base Transceiver Station (BTS) in GSM or CDMA, a base Station (NodeB) in WCDMA, or an evolved Node B (NodeB or eNB or e-NodeB) in LTE, which is not limited in the embodiment of the present invention. The user equipment may include, but is not limited to, various electronic devices such as a smart Phone, a notebook Computer, a Personal Computer (PC), a Personal Digital Assistant (PDA), a Mobile Internet Device (MID), a wearable Device (e.g., a smart watch, a smart bracelet, and smart glasses), wherein an operating system of the user equipment may include, but is not limited to, an Android operating system, an IOS operating system, a Symbian operating system, a blackberry operating system, a Windows Phone8 operating system, and the like, and embodiments of the present invention are not limited thereto.
The mobile device R is a device having a signal forwarding function and capable of moving at a certain height, and may include, but is not limited to, an unmanned aerial vehicle, an airplane, a satellite, and the like.
The target device D is mainly used for transceiving signals, such as transmitting artificial noise signals and receiving useful signals, and may include, but is not limited to, a base station and a user equipment.
The eavesdropping device E is mainly used for receiving the signal transmitted by the mobile device R, and may include, but is not limited to, a base station, a user equipment, a communication vehicle, and the like.
The communication system shown in fig. 1 is suitable for a two-hop wireless relay cooperative network, and in fig. 1, a three-dimensional space coordinate system is established with O as an origin, wherein the three-dimensional space coordinate system includes two ground units (a source device S and a target device D) and a mobile device R. All devices are equipped with only a single antenna and the source device S communicates with the destination device D with the help of the mobile device R. Thus, we call S → R the first hop communication and R → D the second hop communication. In first hop communications, d1Is the corresponding direct path distance, l, between the source end device S and the mobile device R1And l2Is the corresponding reflected path distance between the source device S and the mobile device R. In the second hop communication, d2Is the corresponding direct path distance, l, between the mobile device R and the target device D3And l4Is the corresponding reflected path distance between the mobile device R and the target device D. In fig. 1, it is assumed that there is no direct path between the source end device S and the destination end device D due to the influence of path loss or shadow effect, and the mobile device R can transmit the eavesdropped information to the eavesdropping device E without error.
Where a mobile device R may belong to a heterogeneous network and have different security checks, the mobile device R, once activated, may steal signals while helping to forward signals. In this scenario, although the mobile device R is required to assist in forwarding the signal during the signal transmission process, it is desirable that the signal transmitted by the source device S is kept secret from the mobile device R for secure communication.
It should be noted that the model of the communication system shown in fig. 1 is particularly suitable for a scenario where the source device S is limited in energy but still needs to perform secure communication through the mobile device R, for example, in a disaster area, the transmission energy of the source device S is relatively small (possibly damaged), but the target device D still has sufficient energy feedback information.
In fig. 1, the mobile device R will typically be at a relatively high altitude, and the transmission of the signal will depend primarily on ground reflections. Whereas the conventional cellular communication model only focuses on ground level coverage and does not provide sufficiently accurate characterization for vertical channels with respect to altitude. Therefore, in the present invention, a height and distance-dependent (height and distance-dependent) based mobile relay channel model, which is a mobile relay channel model based on a two-path propagation model and considering antenna characteristics, is selected, and thus vertical channel characteristics with respect to height can be accurately described, instead of focusing on only ground coverage. This mobile relay channel model can be described as:
where d is the distance between two communication devices, l1And l2Respectively, the distance of the reflected path, and delta phi is the phase difference of the signals. From equation (1), it can be seen that the path loss L is defined based on the transmission signal wavelength λ, and the highly dependent direct path antenna gain Gl(h) Highly correlated reflected path antenna gain Gr(h) The highly correlated propagation coefficient γ (h) and the ground reflection coefficient ε. The propagation coefficient γ (h) is defined as:
wherein h istIs the height of the sender, hrIs the height and gamma of the receiver0Is the maximum possible attenuation coefficient. Highly correlated direct path antenna gain Gl(h) Can be expressed as:
and highly correlated reflected path antenna gain Gr(h) Can be expressed as:
wherein h ist,cIs an altitude threshold and G0Is the channel gain for different channel models.
In the communication system shown in fig. 1, a source device S and a target device D may simultaneously transmit signals to a mobile device R, where the source device S transmits a useful signal, the target device D transmits an artificial noise signal, the mobile device R receives the useful signal and the artificial noise signal, amplifies the useful signal and the artificial noise signal, and forwards the processed signals to the target device D, and the target device D may obtain the useful signal from the processed signals, further, the target device D may adaptively adjust the power of the artificial noise signal according to a change trend (rising or falling) of the secret capacity of the communication system, a change trend (rising or falling) of the eavesdropping capacity of the mobile device R, and a path loss of the signal during transmission, and meanwhile, the target device D may also transmit a feedback signal indicating the rise or fall of the secret capacity of the communication system to the mobile device R After receiving the feedback information, the mobile device R can determine the mobile location according to the feedback information and move from the current location of the mobile device to the mobile location, so that the mobile location of the mobile device R can be controlled more flexibly, the privacy capacity of the communication system is further optimized, and secure communication is continuously performed.
Referring to fig. 2, fig. 2 is a flowchart illustrating a method for controlling a position of a mobile device based on dynamic noise of channel information according to an embodiment of the present invention. The method for controlling the position of the mobile device based on the dynamic noise of the channel information is applied to the target device, as shown in fig. 2, and may include the following steps:
step 201, the target device sends the artificial noise signal to the mobile device.
In the embodiment of the present invention, it is assumed that the target device sends the artificial noise signal x to the mobile deviceDThe target end equipment transmits the artificial noise signal xDHas a transmission power of PDWherein the target device and the mobile device transmit the data therebetweenArtificial noise signal xDResulting path loss
The (n +1) th time slot is a current time slot, the nth time slot is a previous time slot of the current time slot, and n is a positive integer.
Step 202, the target terminal device receives the processing signal forwarded by the mobile device.
The processing signal is a signal obtained by processing, by the mobile device, the artificial noise signal and a useful signal received from the source device at the same time.
It is assumed that the source device sends a useful signal x to the mobile deviceS. The source device transmits the useful signal xSHas a transmission power of PSWherein the source device and the mobile device are connected with each other
Transmitting the useful signal xSResulting path loss
The signal received by the mobile equipment is
Wherein eta is1(N +1) denotes mean zero variance N01Complex gaussian noise.
Because the mobile device R adopts an amplify-and-forward mode, the mobile device will receive the signal yR(n +1) is multiplied by an amplification factor W (n +1) and forwarded to the destination device D.
The processing signal received by the target end device D is:
wherein,represents the transfer of the process signal y between the mobile device R and the source deviceDPath loss, η, generated by (n +1)2(N +1) denotes mean zero variance N02Complex gaussian noise.
And step 203, the target end equipment obtains the useful signal from the processed signal.
In the embodiment of the invention, the target end device D knows the artificial noise signal x sent by itselfDTherefore, the target device D can remove the interference x to itselfDObtaining the useful signal as:
step 204, the target end device determines a first change trend of the first privacy capacity of the communication system at the (n +1) th time slot relative to the second privacy capacity of the communication system at the n-th time slot.
In the embodiment of the present invention, the target device may calculate a Signal to Interference plus Noise Ratio (SINR) between the received useful Signal and the artificial Noise Signal as
The amplification factor W (n +1) may be defined as:
the target end equipment can determine the communication capacityWherein the communication capacity may represent the mutual information amount between the source device S and the destination device D.
The SINR between the desired signal and the artificial noise signal received by the mobile device may be expressed as
The mobile device can determine the eavesdropping capacityWherein the eavesdropping capacity can be expressed as the mutual information amount between the source device S and the mobile device R.
The target end device determines the first privacy capacity C of the communication system in the (n +1) th time slots(n+1)＝[CD(n+1)-CR(n+1)]+(15) Wherein
wherein the second secret capacity is an optimal secret capacity of the communication system at an nth time slot. After the destination device determines the first privacy capacity of the communication system at the (n +1) th time slot, the first privacy capacity may be compared with the second privacy capacity of the communication system at the n time slot to determine a first trend of change of the first privacy capacity of the communication system at the (n +1) th time slot relative to the second privacy capacity of the communication system at the n time slot. Wherein the first trend of change may include an increase in a security capacity of the communication system or an invariance of a security capacity of the communication system or a decrease in a security capacity of the communication system.
Step 205, the target device determines a second variation trend of the first eavesdropping capacity of the mobile device at the (n +1) th time slot relative to the second eavesdropping capacity of the mobile device at the n-th time slot.
Wherein the second eavesdropping capacity is an optimal eavesdropping capacity of the mobile device at an nth time slot. The target end device may obtain the first eavesdropping capacity of the mobile device at the (n +1) th time slot from the mobile device, or the target end device may obtain the first eavesdropping capacity of the mobile device at the (n +1) th time slot through gammaD(n) and LR,D(n) calculating a first eavesdropping capacity of the mobile device at the (n +1) th time slot.
After the target end device determines the first interception capacity of the communication system at the (n +1) th time slot, the first interception capacity can be compared with the second interception capacity of the communication system at the n time slot to determine a second variation trend of the first interception capacity of the communication system at the (n +1) th time slot relative to the second interception capacity of the communication system at the n time slot. Wherein the second trend may include an increase in the interception capacity of the communication system or an unchanged interception capacity of the communication system or a decrease in the interception capacity of the communication system.
Step 206, the target end device adjusts the transmission power of the target end device for transmitting the artificial noise signal according to the first variation trend, the second variation trend, the first path loss, the second path loss, the third path loss and the fourth path loss.
The first path loss is a path loss generated by transmitting a signal between the source device and the mobile device at an (n +1) th time slot, the second path loss is a path loss generated by transmitting a signal between the mobile device and the target device at an (n +1) th time slot, the third path loss is a path loss generated by transmitting a signal between the source device and the mobile device at an nth time slot, and the fourth path loss is a path loss generated by transmitting a signal between the mobile device and the target device at an nth time slot.
In the embodiment of the invention, the target function C can be seen from the formulas (1), (10) to (15)SIs a function of the location of the mobile device R, the privacy capacity of the communication system can be improved by adjusting the location optimization of the mobile device R, but at the same time, the mobile device R should be allowed to trust the system sufficiently.
For this purpose, a transmission power P for the artificial noise signal can be introducedDMechanism for adaptive adjustment by satisfying constraint CR(n+1)≥CR(n) to confuse the mobile device R and further improve the privacy capacity of the communication system. Tong (Chinese character of 'tong')Equation CR(n+1)≈CR(n), and the above formula, the adjusting mechanism of the transmission power of the artificial noise signal can be designed as follows:
specifically, the adjusting, by the target device, the transmission power of the target device for transmitting the artificial noise signal according to the first variation trend, the second variation trend, the first path loss, the second path loss, the third path loss, and the fourth path loss includes:
determining P if the first trend indicates an increase in security capacity of the communication system, and the second trend indicates that the eavesdropping capacity of the mobile device has not decreased, and the increase in security capacity of the communication system is greater than the increase in eavesdropping capacity of the mobile deviceD(n+1)＝PD(n)；
Determining that the security capacity of the communication system is increased if the first trend indicates that the security capacity of the communication system is increased and the second trend indicates that the eavesdropping capacity of the mobile device is not decreased and that the security capacity of the communication system is increased by an amount less than or equal to the eavesdropping capacity of the mobile device
Determining that the eavesdropping capacity of the mobile device is reduced if the first trend indicates an increase in the privacy capacity of the communication system and the second trend indicates a decrease in the eavesdropping capacity of the mobile device
If the first change trend indicates that the privacy capacity of the communication system is not improved, determining that the privacy capacity of the communication system is not improved
Wherein, the PD(n +1) is the transmission power of the target end equipment for transmitting the artificial noise signal in the (n +1) th time slot, and P isD(n) transmitting the transmission power of the artificial noise signal in the nth time slot for the target end equipment; said LR,D(n) is the fourth path loss, LS,R(n) is the third path loss, LS,R(n +1) is the first path loss, LR,D(n +1) is the second path loss.
Therein, a secret capacity CSAnd eavesdropping capacity CRThere are four variation trends, but for the simultaneous increase of the secret capacity and the eavesdropping capacity and the increase of the secret capacity by a larger magnitude than the increase of the eavesdropping capacity, the transmission power of the artificial noise signal should be kept unchanged. Since the current position adjustment of the mobile device R is very advantageous for increasing the privacy capacity of the communication system by location optimization and does not therefore sacrifice eavesdropping capacity. For other cases, the mobile device R should be confused by the mechanism of adjusting the transmission power of the artificial noise signal.
The specific algorithm is as follows:
and step 207, the target terminal device sends feedback information to the mobile device according to the first variation trend so as to control the mobile position of the mobile device.
Wherein the feedback information is used to indicate that the privacy capacity of the communication system is increased or decreased. The feedback information comprises positive feedback information or negative feedback information, if the secrecy capacity of the communication system is increased, the target equipment can send 1-bit positive feedback information to the mobile equipment, and if the secrecy capacity of the communication system is decreased, the target equipment can send 1-bit negative feedback information to the mobile equipment, wherein the target end equipment only needs to feed back one-bit feedback information, and network resources can be saved.
After the target terminal device sends the feedback information to the mobile device, the mobile device can determine the mobile position according to the feedback information and move from the current position of the mobile device to the mobile position, so that the mobile position of the mobile device can be more flexibly controlled by adaptively adjusting the power of the artificial noise signal, the secret capacity of a communication system is further optimized, and the secure communication is continuously carried out.
And step 208, the target end device compares the first secret capacity with the second secret capacity, and determines the secret capacity with the larger value of the first secret capacity and the second secret capacity as the best secret capacity of the communication system in the (n +1) th time slot.
In the embodiment of the invention, the security capacity and the wiretapping capacity stored in the memory of the target end equipment are both optimal, namely the second security capacity is the optimal security capacity of the communication system in the nth time slot; the second eavesdropping capacity is the best eavesdropping capacity of the mobile device at the nth time slot.
The target end equipment needs to update the optimal security capacity and the optimal interception capacity in the memory in real time, and the updating rule of the optimal security capacity is as follows:
CS,best(n+1)＝max(CS,best(n),CS(n+1))
the rules for optimal eavesdropping capacity update are:
CR,best(n+1)＝max(CR,best(n),CR(n+1))
according to the above update rule of the optimal secret capacity, the target device needs to compare the first secret capacity with the second secret capacity, and determine the secret capacity with the larger value of the first secret capacity and the second secret capacity as the best secret capacity of the communication system in the (n +1) th time slot.
Step 209, the target device compares the first eavesdropping capacity with the second eavesdropping capacity, and determines the eavesdropping capacity with a larger value between the first eavesdropping capacity and the second eavesdropping capacity as the optimal eavesdropping capacity of the communication system at the (n +1) th time slot.
According to the above update rule of the optimal eavesdropping capacity, the target device needs to compare the first eavesdropping capacity with the second eavesdropping capacity, and determine the eavesdropping capacity with a larger value of the first eavesdropping capacity and the second eavesdropping capacity as the optimal eavesdropping capacity of the communication system at the (n +1) th timeslot.
Step 210, the target device saves the best security capacity of the communication system in the (n +1) th time slot and the best interception capacity of the communication system in the (n +1) th time slot.
In the method described in fig. 2, the target end device may determine a first trend of a first privacy capacity of the communication system at an (n +1) th time slot relative to a second privacy capacity of the communication system at an n th time slot, and determine a second trend of a first eavesdropping capacity of the mobile device at the (n +1) th time slot relative to a second eavesdropping capacity of the mobile device at the n th time slot, and further, the target end device may adjust a transmission power of the target end device for transmitting the artificial noise signal according to the first trend, the second trend, the first path loss, the second path loss, the third path loss, and the fourth path loss to control a mobile position of the mobile device. Therefore, by implementing the embodiment of the present invention, the target device may adaptively adjust the power of the artificial noise signal according to the trend of change (increase or decrease) of the secret capacity of the communication system, the trend of change (increase or decrease) of the eavesdropping capacity of the mobile device, and the path loss of the signal during transmission, and send feedback information to the mobile device according to the first trend of change to control the mobile position of the mobile device, and at the same time, further optimize the secret capacity of the communication system by adaptively adjusting the power of the artificial noise signal, so that secure communication is continuously performed.
Referring to fig. 3, fig. 3 is a flowchart illustrating another method for controlling a position of a mobile device based on dynamic noise of channel information according to an embodiment of the present invention. The mobile device location control method based on dynamic noise of channel information is applied to a mobile device, and as shown in fig. 3, the mobile device location control method based on dynamic noise of channel information may include the following steps:
step 301, the mobile device receives the useful signal sent by the source device and the artificial noise signal sent by the target device at the same time.
Wherein it is assumed that the source device transmits a useful signal x to the mobile device at the same timeSAnd the target end equipment sends an artificial noise signal x to the mobile equipmentD. The signal received by the mobile device is as described in equation (7)
Step 302, the mobile device processes the useful signal and the artificial noise signal to obtain a processed signal, and forwards the processed signal to the target device.
Wherein the mobile device processes the useful signal and the artificial noise signal to obtain a processed signal as described in formula (8)
Step 303, the mobile device receives feedback information returned by the target device for the processed signal.
After receiving the processed signal, the target device may determine a first variation trend of a first privacy capacity of the communication system at an (n +1) th time slot relative to a second privacy capacity of the communication system at an nth time slot, and send feedback information to the mobile device according to the first variation trend, where the feedback information is used to indicate that the privacy capacity of the communication system is increased or decreased. The feedback information comprises positive feedback information or negative feedback information, if the secrecy capacity of the communication system is increased, the target equipment can send 1-bit positive feedback information to the mobile equipment, and if the secrecy capacity of the communication system is decreased, the target equipment can send 1-bit negative feedback information to the mobile equipment.
And step 304, the mobile device determines a mobile position according to the feedback information and the interception capacity of the mobile device, and moves from the current position of the mobile device to the mobile position.
Specifically, the manner in which the mobile device determines the mobile location according to the feedback information and the eavesdropping capacity of the mobile device may specifically be:
if the feedback information is used for indicating that the privacy capacity of the communication system is improved and the interception capacity of the mobile equipment is not reduced, increasing the current moving step length to a first moving step length; determining a moving position according to the current position of the mobile equipment and the first moving step length;
if the feedback information is used for indicating that the privacy capacity of the communication system is reduced, reducing the current moving step length to a second moving step length; and determining the moving position according to the current position of the mobile equipment and the second moving step length.
When the feedback information is used for indicating that the security capacity of the communication system is increased and the interception capacity of the mobile device is not reduced, whether an accumulative positive feedback counter exceeds an accumulative positive feedback counter threshold value needs to be further judged, and if yes, the current moving step length is increased to a first moving step length; similarly, when the feedback information is used to indicate that the security capacity of the communication system is decreased and the interception capacity of the mobile device is not decreased, it is further determined whether the cumulative negative feedback counter exceeds the threshold of the cumulative negative feedback counter, and if yes, the current moving step is decreased to the second moving step. Wherein, in order to avoid the moving step being too large and too fast, a positive feedback counter threshold adjustment factor is also needed to adjust the cumulative positive feedback counter threshold.
The specific examples are as follows:
first, initialization of relevant parameters can be performed, assuming that R (x (0), y (0)) is an initial position of the mobile device R, and the adjustment factor ξ (0) ═ 0 is set, and initially, the optimum secret capacity C is obtainedS,best(0) 0 and optimum eavesdropping capacity CR,best(0)＝0。
Specifically, the corresponding algorithm is as follows:
wherein, CNBeing a continuous negative feedback counter, CPFor accumulating positive feedback counters, CT1For positive feedback counter threshold, CT2For negative feedback of counter threshold, ΔTFor positive feedback counter threshold adjustment factor, delta0(n +1) is the step size of the move, RIFor step size increasing factor, RDThe step size is reduced by a factor.
The mobile equipment determines that the next movement position of the mobile equipment is R (x (n +2), y (n +2)) ═ R according to the feedback informationbest(x (n +1), y (n +1)) + ξ (n +1) + δ (n +1), further the mobile device can move to the position where R (x (n +2), y (n +2)) is located.
In the method described in fig. 3, the mobile device may receive the useful signal sent by the source device and the artificial noise signal sent by the target device at the same time, further process the useful signal and the artificial noise signal to obtain a processed signal, and after sending the processed signal to the target device, may receive feedback information returned by the target device for the processed signal, determine a mobile location according to the feedback information, and move from the current location of the mobile device to the mobile location, so that the privacy capacity of the communication system may be optimized by flexibly controlling the location of the mobile device.
Referring to fig. 4, fig. 4 is a flowchart illustrating another method for controlling a position of a mobile device based on dynamic noise of channel information according to an embodiment of the present invention. The method for controlling the location of the mobile device based on the dynamic noise of the channel information is described from three sides of the source device, the mobile device, and the destination device, and some or all of the steps in fig. 4 may refer to the descriptions in fig. 2 or fig. 3, and are not described again here. As shown in fig. 4, the mobile device location control method based on dynamic noise of channel information may include the steps of:
step 401, the source device sends a useful signal to the mobile device.
Step 402, the target device sends an artificial noise signal to the mobile device.
Wherein step 401 occurs simultaneously with step 402.
Step 403, the mobile device processes the useful signal and the artificial noise signal to obtain a processed signal.
Step 404, the mobile device forwards the processing signal to the target device.
Step 405, the target device obtains the useful signal from the processed signal.
Step 406, the destination device determines a first trend of a first privacy capacity of the communication system at the (n +1) th time slot relative to a second privacy capacity of the communication system at the n-th time slot.
Step 407, the target device determines a second variation trend of the first eavesdropping capacity of the mobile device at the (n +1) th time slot relative to the second eavesdropping capacity of the mobile device at the n-th time slot.
Step 408, the target end device adjusts the transmission power of the target end device for transmitting the artificial noise signal according to the first variation trend, the second variation trend, the first path loss, the second path loss, the third path loss and the fourth path loss.
Step 409, the target end equipment compares the first secret capacity with the second secret capacity, and determines the secret capacity with the larger value of the first secret capacity and the second secret capacity as the best secret capacity of the communication system in the (n +1) th time slot.
Step 410, the target device compares the first interception capacity with the second interception capacity, and determines the interception capacity with a larger value between the first interception capacity and the second interception capacity as the optimal interception capacity of the communication system at the (n +1) th time slot.
Step 411, the target device saves the best security capacity of the communication system in the (n +1) th time slot and the best interception capacity of the communication system in the (n +1) th time slot.
And step 412, the target terminal device sends feedback information to the mobile device according to the first variation trend.
And 413, the mobile device determines a mobile position according to the feedback information and the interception capacity of the mobile device, and moves from the current position of the mobile device to the mobile position.
Referring to fig. 5, fig. 5 is a diagram illustrating convergence of communication capacity, security capacity and eavesdropping capacity according to an embodiment of the invention. The position coordinates of the source device S are set to (-1000m, 1000m, 10m), the position coordinates of the target device D are set to (1000m, -1000m, 10m), the carrier frequency f is set to 2020MHz, and the height of the mobile device R is set to h ═ 100 m. The initial value of the transmission power of the artificial noise signal is set to 0.5W, N01＝N02-80dBm, ground reflection coefficient ∈ 0.5, and fading factor γ0Step size increase factor R, 3.5IStep size reduction factor R1.2D0.7, positive feedback counter threshold CT1Negative feedback counter threshold C2T2Positive feedback counter threshold adjustment factor Δ 5T1, the starting position of R is (-1500m, -1000m, 100m), and the initial step size delta0(0)＝80m。CDIndicating communication capacity, CSRepresenting a secret capacity, CRIndicating eavesdropping capacity. As shown in fig. 5, based on equation CR(n+1)≈CR(n) adjusting PDTo confuse a mobile device R, the communication system is in increasing the security capacity CSWhile not sacrificing eavesdropping capacity CRThereby, the mobile device R can sufficiently trust the communication system and the secure communication can be continuously carried out.
In the method described in fig. 4, the target device may adaptively adjust the power of the artificial noise signal according to the trend of change (increase or decrease) of the privacy capacity of the communication system, the trend of change (increase or decrease) of the eavesdropping capacity of the mobile device, and the path loss of the signal during transmission, and send feedback information to the mobile device according to the first trend of change to control the mobile location of the mobile device, and meanwhile, the privacy capacity of the communication system is further optimized by adaptively adjusting the power of the artificial noise signal.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a mobile device position control apparatus according to an embodiment of the present invention. The mobile device location control apparatus described in fig. 6 may be configured to perform part or all of the steps in the mobile device location control method based on the dynamic noise of the channel information described in fig. 2 or fig. 4, please refer to the related description in fig. 2 or fig. 4, which is not described herein again. The mobile equipment position control device is operated on target end equipment included in the communication system. As shown in fig. 6, the mobile device position control apparatus may include:
a determining unit 601, configured to determine a first trend of a first privacy capacity of the communication system at an (n +1) th time slot relative to a second privacy capacity of the communication system at an nth time slot, where the second privacy capacity is an optimal privacy capacity of the communication system at the nth time slot;
the determining unit 601 is further configured to determine a second variation trend of a first eavesdropping capacity of the mobile device at an (n +1) th time slot relative to a second eavesdropping capacity of the mobile device at an nth time slot, where the second eavesdropping capacity is an optimal eavesdropping capacity of the mobile device at the nth time slot;
an adjusting unit 602, configured to adjust a transmission power of the target device for transmitting the artificial noise signal according to the first variation trend, the second variation trend, the first path loss, the second path loss, the third path loss, and the fourth path loss;
a first sending unit 603, configured to send feedback information to the mobile device according to the first variation trend to control a moving location of the mobile device, where the feedback information is used to indicate that a privacy capacity of the communication system is increased or decreased;
wherein the (n +1) th time slot is a current time slot, the nth time slot is a previous time slot of the current time slot, and n is a positive integer; the first path loss is a path loss generated by transmitting a signal between the source device and the mobile device at an (n +1) th time slot, the second path loss is a path loss generated by transmitting a signal between the mobile device and the target device at an (n +1) th time slot, the third path loss is a path loss generated by transmitting a signal between the source device and the mobile device at an nth time slot, and the fourth path loss is a path loss generated by transmitting a signal between the mobile device and the target device at an nth time slot.
Specifically, the manner of adjusting, by the adjusting unit 602, the transmission power of the target device for transmitting the artificial noise signal according to the first variation trend, the second variation trend, the first path loss, the second path loss, the third path loss, and the fourth path loss specifically is:
determining P if the first trend indicates an increase in security capacity of the communication system, and the second trend indicates that the eavesdropping capacity of the mobile device has not decreased, and the increase in security capacity of the communication system is greater than the increase in eavesdropping capacity of the mobile deviceD(n+1)＝PD(n)；
Determining that the security capacity of the communication system is increased if the first trend indicates that the security capacity of the communication system is increased and the second trend indicates that the eavesdropping capacity of the mobile device is not decreased and that the security capacity of the communication system is increased by an amount less than or equal to the eavesdropping capacity of the mobile device
Determining that the eavesdropping capacity of the mobile device is reduced if the first trend indicates an increase in the privacy capacity of the communication system and the second trend indicates a decrease in the eavesdropping capacity of the mobile device
If the first change trend indicates that the privacy capacity of the communication system is not improved, determining that the privacy capacity of the communication system is not improved
Wherein, the PD(n +1) is the transmission power of the target end equipment for transmitting the artificial noise signal in the (n +1) th time slot, and P isD(n) transmitting the transmission power of the artificial noise signal in the nth time slot for the target end equipment; said LR,D(n) is the fourth path loss, LS,R(n) is the third path loss, LS,R(n +1) is the first path loss, LR,D(n +1) is the second path loss.
The mobile device location control apparatus described in fig. 6 is implemented to adaptively adjust the power of the artificial noise signal according to the trend of change (increase or decrease) of the secret capacity of the communication system, the trend of change (increase or decrease) of the eavesdropping capacity of the mobile device, and the path loss of the signal during transmission, and to transmit feedback information to the mobile device according to the first trend of change to control the mobile location of the mobile device, and to further optimize the secret capacity of the communication system by adaptively adjusting the power of the artificial noise signal, so that secure communication is continuously performed.
Referring to fig. 7, fig. 7 is a schematic structural diagram of another mobile device position control apparatus according to an embodiment of the disclosure. The mobile device location control apparatus described in fig. 7 may be configured to perform part or all of the steps in the mobile device location control method based on the dynamic noise of the channel information described in fig. 2 or fig. 4, please refer to the related description in fig. 2 or fig. 4, which is not described herein again. The mobile equipment position control device is operated on target end equipment included in the communication system. The mobile device position control device shown in fig. 7 is optimized by the mobile device position control device shown in fig. 6. Compared with the mobile device location control apparatus shown in fig. 6, the mobile device location control apparatus shown in fig. 7 may further include:
a comparison determination unit 604, configured to compare the first secret capacity with the second secret capacity, and determine, as the best secret capacity in the (n +1) th timeslot of the communication system, the secret capacity with the larger value of the first secret capacity and the second secret capacity;
the comparison determining unit 604 is further configured to compare the first eavesdropping capacity with the second eavesdropping capacity, and determine the eavesdropping capacity with a larger value of the first eavesdropping capacity and the second eavesdropping capacity as the optimal eavesdropping capacity of the communication system at the (n +1) th timeslot;
a holding unit 605, configured to hold the optimal privacy capacity of the communication system at the (n +1) th time slot and the optimal eavesdropping capacity of the communication system at the (n +1) th time slot.
Optionally, the mobile device position control apparatus shown in fig. 7 may further include:
a second sending unit 606, configured to send the artificial noise signal to the mobile device before the determining unit 601 determines a first trend of change of the first privacy capacity of the communication system at the (n +1) th time slot relative to the second privacy capacity of the communication system at the n-th time slot;
a receiving unit 607, configured to receive a processing signal forwarded by the mobile device, where the processing signal is a signal obtained by processing, by the mobile device, the artificial noise signal and a useful signal received from the source device at the same time;
an obtaining unit 608, configured to obtain the useful signal from the processed signal.
The mobile device position control device described in fig. 7 is implemented to receive the processed signal from the mobile device and obtain the useful signal from the processed signal, to implement secure communication, and to transmit feedback information to the mobile device according to the first trend of change to control the mobile position of the mobile device, and further to optimize the privacy capacity of the communication system by adaptively adjusting the power of the artificial noise signal, and further to update and save the privacy capacity of the communication system and the eavesdropping capacity of the mobile device in real time.
Referring to fig. 8, fig. 8 is a schematic structural diagram of another mobile device position control apparatus according to an embodiment of the present disclosure. The mobile device location control apparatus described in fig. 8 may be configured to perform part or all of the steps in the mobile device location control method based on the dynamic noise of the channel information described in fig. 3 or fig. 4, please refer to the related description in fig. 3 or fig. 4, which is not described herein again. Wherein the mobile device position control apparatus operates in a mobile device included in the communication system. As shown in fig. 8, the mobile device position control apparatus may include:
a receiving unit 801, configured to receive a useful signal sent by the source device and an artificial noise signal sent by the target device at the same time;
a processing and sending unit 802, configured to process the useful signal and the artificial noise signal to obtain a processed signal, and forward the processed signal to the target device;
the receiving unit 801 is further configured to receive feedback information returned by the target device for the processed signal, where the feedback information is used to indicate that the security capacity of the communication system is increased or decreased;
a determining unit 803, configured to determine a mobile location according to the feedback information and the eavesdropping capacity of the mobile device;
specifically, the manner of determining the mobile location by the determining unit 803 according to the feedback information and the eavesdropping capacity of the mobile device is specifically as follows:
if the feedback information is used for indicating that the privacy capacity of the communication system is improved and the interception capacity of the mobile equipment is not reduced, increasing the current moving step length to a first moving step length; determining a moving position according to the current position of the mobile equipment and the first moving step length;
if the feedback information is used for indicating that the privacy capacity of the communication system is reduced, reducing the current moving step length to a second moving step length; and determining the moving position according to the current position of the mobile equipment and the second moving step length.
A moving unit 804, configured to move from a location where the mobile device is currently located to the moving location.
By implementing the mobile device location control apparatus shown in fig. 8, after receiving the useful signal sent by the source device and the artificial noise signal sent by the target device at the same time, further processing the useful signal and the artificial noise signal to obtain a processed signal, and sending the processed signal to the target device, the mobile device location control apparatus can receive feedback information returned by the target device for the processed signal, determine a mobile location according to the feedback information, and move from the current location of the mobile device to the mobile location, thereby optimizing the privacy capacity of the communication system by flexibly controlling the location of the mobile device.
In the foregoing embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described embodiments of the apparatus are merely illustrative, and for example, the division of the units is only one type of division of logical functions, and there may be other divisions when actually implementing, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection of some interfaces, devices or units, and may be an electric or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a 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 stand-alone product, may be stored in a computer readable memory. Based on such understanding, the technical solution of the present invention may be embodied in the form of a software product, which is stored in a memory and includes several instructions for causing a computer device (which may be a personal computer, a server, a network device, or the like) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned memory comprises: a U-disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a removable hard disk, a magnetic or optical disk, and other various media capable of storing program codes.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by associated hardware instructed by a program, which may be stored in a computer-readable memory, which may include: flash Memory disks, Read-Only memories (ROMs), Random Access Memories (RAMs), magnetic or optical disks, and the like.
The method and the device for controlling the position of the mobile device based on the dynamic noise of the channel information disclosed by the embodiment of the invention are described in detail, a specific example is applied in the text to explain the principle and the implementation of the invention, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.

Claims (5)

1. A mobile device location control method based on dynamic noise of channel information is applied to a target end device included in a communication system, wherein the communication system further includes the mobile device and a source end device, and the method comprises:
determining a first change trend of a first privacy capacity of the communication system at an (n +1) th time slot relative to a second privacy capacity of the communication system at an n time slot, wherein the second privacy capacity is an optimal privacy capacity of the communication system at the n time slot;
determining a second variation trend of a first interception capacity of the mobile device at an (n +1) th time slot relative to a second interception capacity of the mobile device at an nth time slot, wherein the second interception capacity is an optimal interception capacity of the mobile device at the nth time slot;
adjusting the transmission power of the target end equipment for transmitting the artificial noise signal according to the first variation trend, the second variation trend, the first path loss, the second path loss, the third path loss and the fourth path loss;
according to the first change trend, sending feedback information to the mobile equipment to control the mobile position of the mobile equipment, wherein the feedback information is used for indicating that the privacy capacity of the communication system is improved or reduced;
wherein the (n +1) th time slot is a current time slot, the nth time slot is a previous time slot of the current time slot, and n is a positive integer; the first path loss is a path loss generated by transmitting a signal between the source device and the mobile device at an (n +1) th time slot, the second path loss is a path loss generated by transmitting a signal between the mobile device and the target device at an (n +1) th time slot, and the third path loss is a path loss generated by transmitting a signal between the source device and the mobile device at an n th time slotA fourth path loss, which is a path loss generated by transmitting a signal between the mobile device and the target device at the nth time slot, comparing the first security capacity with the second security capacity, determining a security capacity with a larger value of the first security capacity and the second security capacity as an optimal security capacity of the communication system at the (n +1) th time slot, and comparing the first interception capacity with the second interception capacity, determining a interception capacity with a larger value of the first interception capacity and the second interception capacity as an optimal interception capacity of the communication system at the (n +1) th time slot, and storing the optimal security capacity of the communication system at the (n +1) th time slot and the optimal interception capacity of the communication system at the (n +1) th time slot according to the trend of the first change, the second change, and the third change, The adjusting the transmission power of the target device for transmitting the artificial noise signal according to the second variation trend, the first path loss, the second path loss, the third path loss, and the fourth path loss includes: determining P if the first trend indicates an increase in security capacity of the communication system, and the second trend indicates that the eavesdropping capacity of the mobile device has not decreased, and the increase in security capacity of the communication system is greater than the increase in eavesdropping capacity of the mobile deviceD(n+1)＝PD(n), if the first trend of change indicates that the interception capacity of the communication system is increased, and the second trend of change indicates that the interception capacity of the mobile device is not reduced, and the increase of the interception capacity of the communication system is smaller than or equal to the increase of the interception capacity of the mobile device, determining that the interception capacity of the mobile device is increasedDetermining that the eavesdropping capacity of the mobile device is reduced if the first trend indicates an increase in the privacy capacity of the communication system and the second trend indicates a decrease in the eavesdropping capacity of the mobile deviceIf the first change trend indicates that the security capacity of the communication system is not improvedDeterminingWherein, the PD(n +1) is the transmission power of the target end equipment for transmitting the artificial noise signal in the (n +1) th time slot, and P isD(n) is the transmission power of the target end equipment for transmitting the artificial noise signal in the nth time slot, and L isR,D(n) is the fourth path loss, LS,R(n) is the third path loss, LS,R(n +1) is the first path loss, LR,D(n +1) is the second path loss, and the first secret capacity satisfies Cs(n+1)＝[CD(n+1)-CR(n+1)]+， CD(n +1) represents a communication capacity representing the amount of mutual information between the source device and the destination device, CR(n +1) represents an eavesdropping capacity expressed as a mutual information amount between the source device and the mobile device, γD(n +1) represents the signal-to-interference-and-noise ratio, gamma, between the useful signal and the artificial noise signal received by the target deviceR(n +1) represents the signal to interference plus noise ratio between the desired signal and the artificial noise signal received by the mobile device.
2. The method of claim 1, wherein the determining the first trend of the first privacy capacity of the communication system at the (n +1) th time slot relative to the second privacy capacity of the communication system at the n-th time slot is preceded by the method further comprising:
transmitting the artificial noise signal to the mobile device;
receiving a processing signal forwarded by the mobile device, where the processing signal is a signal obtained by processing the artificial noise signal and a useful signal received from the source device at the same time by the mobile device;
obtaining the useful signal from the processed signal.
3. A mobile device location control method based on dynamic noise of channel information is applied to a mobile device included in a communication system, wherein the communication system further includes a source device and a target device, and the method comprises:
receiving a useful signal sent by the source end device and an artificial noise signal sent by the target end device at the same time;
processing the useful signal and the artificial noise signal to obtain a processed signal, and forwarding the processed signal to the target end equipment;
receiving feedback information returned by the target end equipment aiming at the processing signal, wherein the feedback information is used for representing the increase or decrease of the security capacity of the communication system;
determining a mobile location based on the feedback information and the eavesdropping capacity of the mobile device, and moving from the current location of the mobile device to the mobile location,
if the feedback information is used for indicating that the privacy capacity of the communication system is improved and the eavesdropping capacity of the mobile equipment is not reduced, increasing the current moving step length to a first moving step length, determining the moving position according to the current position of the mobile equipment and the first moving step length, if the feedback information is used for indicating that the privacy capacity of the communication system is reduced, reducing the current moving step length to a second moving step length, determining the moving position according to the current position of the mobile equipment and the second moving step length, wherein the eavesdropping capacity meets the requirement of the eavesdropping capacityThe eavesdropping capacity is expressed as the mutual information amount, gamma, between the source device and the mobile deviceR(n +1) represents the mobile device being connected toThe signal-to-interference-and-noise ratio between the received useful signal and the artificial noise signal, and the communication capacityThe communication capacity represents the amount of mutual information, γ, between the source device and the destination deviceD(n +1) represents the signal-to-interference-and-noise ratio between the useful signal and the artificial noise signal received by the target end equipment, and the first secret capacity satisfies Cs(n+1)＝[CD(n+1)-CR(n+1)]+，
4. A mobile device location control apparatus, operable in a target device included in a communication system, the communication system further including the mobile device and a source device, comprising:
a determining unit, configured to determine a first trend of a first privacy capacity of the communication system at an (n +1) th time slot relative to a second privacy capacity of the communication system at an nth time slot, where the second privacy capacity is an optimal privacy capacity of the communication system at the nth time slot;
the determining unit is further configured to determine a second variation trend of a first eavesdropping capacity of the mobile device at an (n +1) th time slot relative to a second eavesdropping capacity of the mobile device at an nth time slot, where the second eavesdropping capacity is an optimal eavesdropping capacity of the mobile device at the nth time slot;
a comparison determination unit configured to compare the first secret capacity with the second secret capacity, and determine a secret capacity with a larger value of the first secret capacity and the second secret capacity as a best secret capacity of the communication system in an (n +1) th timeslot;
the comparison and determination unit is further configured to compare the first eavesdropping capacity with the second eavesdropping capacity, and determine the eavesdropping capacity with a larger value of the first eavesdropping capacity and the second eavesdropping capacity as the optimal eavesdropping capacity of the communication system at the (n +1) th timeslot;
a holding unit for holding the optimum secrecy capacity of the communication system at the (n +1) th time slot and the optimum wiretapping capacity of the communication system at the (n +1) th time slot;
the adjusting unit is used for adjusting the transmission power of the target end equipment for transmitting the artificial noise signal according to the first change trend, the second change trend, the first path loss, the second path loss, the third path loss and the fourth path loss;
a first sending unit, configured to send feedback information to the mobile device according to the first variation trend to control a moving position of the mobile device, where the feedback information is used to indicate that a privacy capacity of the communication system is increased or decreased;
wherein the (n +1) th time slot is a current time slot, the nth time slot is a previous time slot of the current time slot, and n is a positive integer; the first path loss is a path loss generated by transmitting a signal between the source device and the mobile device at an (n +1) th slot, the second path loss is a path loss generated by transmitting a signal between the mobile device and the target end device at an (n +1) th time slot, the third path loss is a path loss generated by transmitting a signal between the source device and the mobile device at an nth slot, the fourth path loss is a path loss generated by transmitting a signal between the mobile device and the target device at an nth time slot, the adjusting unit adjusts the transmission power of the target device for transmitting the artificial noise signal according to the first variation trend, the second variation trend, the first path loss, the second path loss, the third path loss, and the fourth path loss in a specific manner: determining P if the first trend indicates an increase in security capacity of the communication system, and the second trend indicates that the eavesdropping capacity of the mobile device has not decreased, and the increase in security capacity of the communication system is greater than the increase in eavesdropping capacity of the mobile deviceD(n+1)＝PD(n) if the first trend indicates the communication systemThe security capacity of the system is increased, the second change trend indicates that the interception capacity of the mobile device is not reduced, and the amplitude of the increase of the security capacity of the communication system is smaller than or equal to the amplitude of the increase of the interception capacity of the mobile device, and the mobile device is determined to be in a state of being protected by the security capacity of the communication systemDetermining that the eavesdropping capacity of the mobile device is reduced if the first trend indicates an increase in the privacy capacity of the communication system and the second trend indicates a decrease in the eavesdropping capacity of the mobile deviceIf the first change trend indicates that the privacy capacity of the communication system is not improved, determining that the privacy capacity of the communication system is not improvedWherein, the PD(n +1) is the transmission power of the target end equipment for transmitting the artificial noise signal in the (n +1) th time slot, and P isD(n) transmitting the transmission power of the artificial noise signal in the nth time slot for the target end equipment; said LR,D(n) is the fourth path loss, LS,R(n) is the third path loss, LS,R(n +1) is the first path loss, LR,D(n +1) is the second path loss, and the first secret capacity satisfies Cs(n+1)＝[CD(n+1)-CR(n+1)]+， CD(n +1) represents a communication capacity representing the amount of mutual information between the source device and the destination device, CR(n +1) represents an eavesdropping capacity expressed as a mutual information amount between the source device and the mobile device, γD(n +1) represents a useful signal received by the target end equipmentSignal to interference plus noise ratio, gamma, with artificial noise signalsR(n +1) represents the signal to interference plus noise ratio between the desired signal and the artificial noise signal received by the mobile device.
5. The mobile device location control apparatus of claim 4, further comprising:
a second transmitting unit configured to transmit the artificial noise signal to the mobile device before the determining unit determines a first trend of change of the first privacy capacity of the communication system at the (n +1) th time slot with respect to a second privacy capacity of the communication system at the n-th time slot;
a receiving unit, configured to receive a processing signal forwarded by the mobile device, where the processing signal is a signal obtained by processing, by the mobile device, the artificial noise signal and a useful signal received from the source device at the same time;
an acquisition unit for obtaining the useful signal from the processed signal.
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