WO2018119890A1

WO2018119890A1 - Cdma system physical layer security configuration method and device

Info

Publication number: WO2018119890A1
Application number: PCT/CN2016/113062
Authority: WO
Inventors: 李明; 遆光宇
Original assignee: 深圳天珑无线科技有限公司
Priority date: 2016-12-29
Filing date: 2016-12-29
Publication date: 2018-07-05

Abstract

Disclosed are a CDMA system physical layer security configuration method and device, relating to the technical field of wireless communication. The invention achieves a method of physical layer security protection for a CDMA system, and avoids the problems of high implementation complexity of technical security measures and large system resource consumption in existing CDMA systems. The main technical solution of the invention is: first, obtaining channel information of a legal user and channel information of an illegal user; then, according to the channel information of the legal user and an interference noise autocorrelation matrix of the legal user, obtaining a first matrix corresponding to the legal user; and according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user, obtaining a second matrix corresponding to the illegal user; finally, according to the first matrix and the second matrix, obtaining a spreading code group and a transmission power corresponding to the legal user by means of a preset iteration algorithm. The present invention is mainly used in the technical field of interference in wireless communication systems.

Description

Physical layer security configuration method and device for CDMA system

Technical field

The present invention relates to the field of wireless communication technologies, and in particular, to a physical layer security configuration method and apparatus for a CDMA system.

Background technique

With the continuous development of wireless communication technologies, the usage rate of wireless communication systems is also increasing. Among them, CDMA (CodeDivision Multiple Access) system is one of the more commonly used systems in wireless communication systems. In a CDMA system, each legal user separately shares a unique spreading code with the base station and communicates with the base station through a spreading code. In the downlink of the CDMA system, the spreading codes are orthogonal or nearly orthogonal to each other, thereby It can be guaranteed that the transmitted signals of multiple legitimate users will not interfere with each other. Although the spread spectrum characteristic of CDMA ensures that the spread spectrum signal can resist the spectrum analysis attack and has the security feature that is difficult to be detected, the illegal user can extract the spread code of the legitimate user with relatively high accuracy through blind detection and the like. And send a signal. In view of this, the security technology developed for CDMA systems is becoming more and more important.

At present, the security technology of the existing CDMA system is mainly applied to the upper layer security protocol of the communication system, and the information sent between the legitimate user and the base station is encrypted by means of the authentication and encryption algorithm. However, in the wireless communication environment, the existing security technology has the following problems: if the security protection of the CDMA system is implemented by the symmetric encryption algorithm, since the symmetric encryption algorithm needs to distribute and manage the key, the security technology is realized. The complexity is higher; if the security protection of the CDMA system is realized by the asymmetric encryption algorithm, the computational complexity of the asymmetric encryption algorithm is high, resulting in large system resource consumption.

Summary of the invention

In view of this, the embodiments of the present invention provide a physical layer security configuration method and device for a CDMA system, and the main purpose thereof is to solve the problem that the implementation security technology of the existing CDMA system has high complexity and large system resource consumption.

In order to achieve the above object, the present invention provides the following technical solutions:

In one aspect, the present invention provides a physical layer security configuration method for a CDMA system, including:

Obtaining channel information of a legitimate user and channel information of an illegal user;

Acquiring the first matrix corresponding to the legal user according to the channel information of the legal user and the interference noise autocorrelation matrix of the legal user, and acquiring the second matrix corresponding to the illegal user according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user ;

And obtaining, according to the first matrix and the second matrix, a spreading code group and a transmission power corresponding to the legal user by using a preset iterative algorithm.

In another aspect, the present invention provides a physical layer security configuration apparatus for a CDMA system, including:

An acquiring unit, configured to obtain channel information of a legal user and channel information of an illegal user;

The acquiring unit is further configured to obtain a first matrix corresponding to the legal user according to the channel information of the legal user and the interference noise autocorrelation matrix of the legal user, and according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user, Obtaining a second matrix corresponding to the illegal user;

And a generating unit, configured to generate, according to the first matrix and the second matrix, a spreading code group and a sending power corresponding to the legal user by using a preset iterative algorithm.

With the above technical solution, the technical solution provided by the embodiment of the present invention has at least the following advantages:

The physical layer security configuration method and device for the CDMA system provided by the embodiment of the present invention, when the physical layer security configuration of the CDMA system needs to be performed, firstly, the channel information of the legal user and the channel information of the illegal user are obtained, and then according to the legitimate user The channel information and the interference noise autocorrelation matrix of the legal user acquire the first matrix corresponding to the legal user, and obtain the second matrix corresponding to the illegal user according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user, and finally obtain the second matrix corresponding to the illegal user. The first matrix and the second matrix are obtained by using a preset iterative algorithm to obtain a spreading code group and a transmission power corresponding to the legal user. The security technology of the existing CDMA system is mainly applied to the upper layer security protocol of the communication system, and relies on the authentication and encryption algorithm to encrypt the information transmitted between the legitimate user and the base station, because the channel is unique in the wireless communication environment. Sexuality and difference, the present invention utilizes the degree of freedom of the base station in the code domain space, realizes the physical layer security protection method of the CDMA system through the iterative manner of the spreading code, and avoids the implementation complexity of the existing CDMA system security technology. High, the problem of large system resource consumption. The above description is only an overview of the technical solutions of the present invention, and the above-described and other objects, features and advantages of the present invention can be more clearly understood. Specific embodiments of the invention are set forth below.

DRAWINGS

Various other advantages and benefits will become apparent to those skilled in the art from a The drawings are only for the purpose of illustrating the preferred embodiments and are not to be construed as limiting. Throughout the drawings, the same reference numerals are used to refer to the same parts. In the drawing:

1 is a flowchart of a physical layer security configuration method of a CDMA system according to an embodiment of the present invention;

FIG. 2 is a schematic diagram showing the principle of a CDMA system according to an embodiment of the present invention;

FIG. 3 is a flowchart of a physical layer security configuration method of another CDMA system according to an embodiment of the present invention;

4 is a schematic structural diagram of a physical layer security configuration apparatus of a CDMA system according to an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of another physical layer security configuration apparatus of a CDMA system according to an embodiment of the present invention.

detailed description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the embodiments of the present invention have been shown in the drawings, the embodiments Rather, these embodiments are provided so that this disclosure will be more fully understood and the scope of the disclosure will be fully disclosed.

A physical layer security configuration method for a CDMA system according to an embodiment of the present invention is shown in FIG. 1 , where the method includes:

101. Obtain channel information of a legal user and channel information of an illegal user.

The legal user is a user who should perform normal communication with the base station, and the illegal user is a user who maliciously steals the transmission signal and the spreading code between the legal user and the base station. For the embodiment of the present invention, the implementation principle of the CDMA system can be as shown in FIG. 2, where the square block is a base station, the circular block is a legitimate user, and the triangular block is an illegal user.

102. Obtain a first matrix corresponding to a legal user according to the channel information of the legal user and the interference noise autocorrelation matrix of the legal user, and obtain the corresponding number of the illegal user according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user. Two matrix.

The first matrix and the second matrix may be Q matrices. The method for obtaining the interference noise self-correlation matrix of the legal user may specifically include: adopting a formula

Acquired, where c _k represents interference from other users in the environment, n _k is Gaussian white noise, and z _k is multiple access interference. Similarly, the method for obtaining the interference noise autocorrelation matrix of the illegal user is similar to the above method, and will not be described herein.

103. Obtain, according to the first matrix and the second matrix, a spreading code group and a sending power corresponding to the legal user by using a preset iterative algorithm.

The physical layer security configuration method of the CDMA system provided by the embodiment of the present invention, when the physical layer security configuration of the CDMA system needs to be performed, firstly, the channel information of the legal user and the channel information of the illegal user are obtained, and then the channel information of the legal user is obtained. And the interference noise autocorrelation matrix of the legal user acquires the first matrix corresponding to the legal user, and obtains the second matrix corresponding to the illegal user according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user, and finally according to the A matrix and the second matrix obtain a spreading code group and a transmission power corresponding to the legal user by using a preset iterative algorithm. The security technology of the existing CDMA system is mainly applied to the upper layer security protocol of the communication system, and relies on the authentication and encryption algorithm to encrypt the information transmitted between the legitimate user and the base station, because the channel is unique in the wireless communication environment. Sexuality and difference, the present invention utilizes the degree of freedom of the base station in the code domain space, realizes the physical layer security protection method of the CDMA system through the iterative manner of the spreading code, and avoids the implementation complexity of the existing CDMA system security technology. High, the problem of large system resource consumption.

Further, the embodiment of the present invention provides another physical layer security configuration method for a CDMA system. As shown in FIG. 3, the method includes:

201. Obtain channel information of a legal user and channel information of an illegal user.

For the embodiment of the present invention, the step 201 may include: acquiring channel information of the legal user and channel information of the illegal user according to the preset training signal. Specifically, the legal user sends the channel information of the legal user by sending a training pilot signal that is pre-agreed with the base station, and then the legitimate user estimates the channel information when the received signal and the transmitted signal are known.

In this embodiment, the preset wireless channel between the legal user and the base station obeys the common Rayleigh multi-fading distribution. At this time, for the kth legitimate user, the estimated parameter vector of the channel information is: h _k =[h _k,1 ,h _k,2 ,...,h _k,M ],k=1,2,...,K, where the number of legitimate users in the system is K. Further, in the case where the location of the illegal user can be known, the parameter vector of the illegal user channel information is h _e =[h _e,1 ,h _e,2 ,...,h _e,M ].

In order to further demonstrate the implementation principle of the embodiment of the present invention, a system model according to an embodiment of the present invention is first briefly given. In the system model, the transmitted signal can be expressed as:

Where E _i represents the bit energy of the ith user transmitted signal, and b _i (n) ∈ {±1} represents the transmitted nth bit signal of the ith user,

Indicates the spread spectrum waveform of the ith user,

l = 0, 1, ..., L-1 is a digitized waveform to be designed, and ψ(t) is a transmission waveform pulse former with a period of T _c = T/L, such as an ideal square wave, a raised cosine, and the like. Then, after carrier demodulation, ψ(·) pulse matching filtering, and multipath extended data sampling of length L _M =L+M-1, the received signal of the kth legitimate user

It can be expressed as:

Where H _k is the multipath channel matrix of the sender and the kth legitimate user, c _k represents interference from other users in the environment, n _k is Gaussian white noise, and z _k represents multiple access interference.

Further, the information bit detection of the preset legal user is filtered by using a linear maximum signal to interference and noise ratio as:

among them,

Indicates the maximum signal to noise ratio filtering, and R _k is the autocorrelation matrix of interference and noise. At this time, for the kth user, the SINR of the output signal filtered using the maximum SINR is

Due to the broadcast characteristics of the wireless channel, illegal users can also receive signals as described above, and the maximum SINR filtering can also be used to steal secret information. For illegal users, the maximum SINR of the output is

Further, in order to enable a legitimate user to deteriorate the communication channel of the illegal user to the greatest extent possible while satisfying certain quality of service QoS requirements. To this end, the above problem can be mathematically expressed as the following objective equation:

Where γ _k represents the quality of service QoS requirement of the legitimate user channel, and E _max represents the maximum distributable energy of each legitimate user.

Based on the above model, through the subsequent steps, the preset Rayleigh quotient quantization algorithm is used to iteratively optimize the spreading code, so that the above-mentioned target equation is optimized and the problem of multiple access interference is avoided, thereby realizing the CDMA system. The physical layer security protection method, in particular, the iterative spreading code group algorithm used in the embodiment of the present invention has the advantages of fast convergence and low computational complexity, thereby ensuring the implementability of the physical layer security protection method.

202. Obtain a first matrix corresponding to the legal user according to the channel information of the legal user and the interference noise autocorrelation matrix of the legal user, and obtain the corresponding number of the illegal user according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user. Two matrix.

For the embodiment of the present invention, step 202 may specifically include: according to a formula

Obtaining a first matrix corresponding to the legal user, where Q _k is a first matrix corresponding to the legal user, H _k is channel information of the legal user, and R _k is an interference noise autocorrelation matrix of the legal user, and then according to the formula

Obtaining a second matrix corresponding to the illegal user, wherein, Q _ek second matrix corresponding to the illegal user, H _e is the channel information of unauthorized users, R _ek illegal user interference noise autocorrelation matrix.

203. Determine whether the current number of iterations is less than or equal to a preset threshold, and determine whether the current spreading code group and the sending power corresponding to the legal user obtained by the preset iterative algorithm meet the convergence condition corresponding to the preset iterative algorithm.

The convergence condition corresponding to the preset iterative algorithm is that the spreading code and the transmission power energy obtained by two consecutive iterations remain almost unchanged, that is, ||S ^j -S ^j+1 ||=0 and ||e ^j -e ^j+1 || ^≤ ε, where ε can be taken as 10 ^-5 . For the embodiment of the present invention, before step 203, the method further includes: initializing a spreading code S ⁰ =0 of the legal user, and transmitting power e ⁰ =0.

204a. If the spreading code group corresponding to the legal user obtained by the preset iterative algorithm and the sending power meet the convergence condition corresponding to the preset iterative algorithm, output the spreading code group and the sending power.

Step 204b, which is parallel to step 204a, if the spreading code group and the transmission power corresponding to the legal user currently obtained by the preset iterative algorithm do not meet the convergence condition corresponding to the preset iterative algorithm and whether the current number of iterations is less than or equal to The preset threshold is obtained, according to the first matrix and the second matrix, obtaining a spreading code group and a transmission power corresponding to the legal user by using a preset Rayleigh quotient quantization algorithm.

For the embodiment of the present invention, the preamble Rayleigh quotation algorithm is used to obtain the spreading code group and the sending power corresponding to the legal user, so as to ensure that the legal user's signal to interference ratio is greater than a certain quality of service QoS requirement, and the maximum is The information of the illegal users is reduced, thereby preventing the illegal users from stealing signals, realizing the physical layer security of the CDMA system, and avoiding the problem of multiple access interference.

For the embodiment of the present invention, the step 204b may specifically include: if there is a legitimate user that does not acquire the spreading code group and the sending power,

Generating an alternative set of spreading code groups P ^j =[p ₁ ,p ₂ ,...,p _k ], wherein

For the second matrix, j is the current number of iterations, and then according to the formula

Update the first matrix and according to the formula

Update the second matrix

among them,

For the first matrix, H _k is the multipath channel matrix of the transmitting end and the kth legitimate user, H _e is the multipath channel matrix of the illegal user, and E _i represents the bit energy of the i th user transmitting signal,

Represents the spread spectrum waveform of the ith user, c _k represents interference from other users in the environment, n _k is Gaussian white noise; and then selects power limit from P ^j

And meet the minimum Rayleigh quotient

The spreading code and transmission power of the value condition are used as the spreading code of the kth legal user.

And transmit power, and remove the spreading code from the candidate set P ^j

Finally, the spreading code group and the transmission power of the legal user are obtained according to the spreading code and the transmission power of each legal user.

It should be noted that, in order to satisfy the generation of a set of approximately orthogonal spreading codes and reduce the multiple access interference between legitimate users, the embodiment of the present invention approximates the method of decomposing the feature vectors of the Q _e matrix to generate an alternative set P. .

Step 2034c, which is parallel to step 2034a and step 2034b, if the current iteration number is greater than the preset threshold and does not meet the convergence condition corresponding to the preset iteration algorithm, reconfigure the order of the legitimate users.

It should be noted that, because the result of the preset iterative algorithm is related to the order of the legitimate users, that is, the order in which the obtaining of the spreading code is performed, the order of the legitimate users can be randomly re-scrambled in the case where the calculation does not converge. That is, the acquisition order of the spreading code is re-scrambled, so that the spreading code group is obtained again to ensure the physical layer security configuration.

Another physical layer security configuration method of the CDMA system provided by the embodiment of the present invention, when the physical layer security configuration of the CDMA system needs to be performed, first acquires channel information of the legal user and channel information of the illegal user, and then according to the channel of the legal user. Acquiring the first matrix corresponding to the legal user by the interference noise autocorrelation matrix of the legal user, and acquiring the second matrix corresponding to the illegal user according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user, and finally according to the The first matrix and the second matrix obtain a spreading code group and a transmission power corresponding to the legal user by using a preset iterative algorithm. The security technology of the existing CDMA system is mainly applied to the upper layer security protocol of the communication system, and relies on the authentication and encryption algorithm to encrypt the information transmitted between the legitimate user and the base station, because the channel is unique in the wireless communication environment. Sexuality and difference, the present invention utilizes the degree of freedom of the base station in the code domain space, and realizes the physical layer security of the CDMA system through the iterative manner of the spreading code. The protection method avoids the problem that the implementation of the security technology of the existing CDMA system is high in complexity and the system resource consumption is large.

Further, as a specific implementation of the method shown in FIG. 1, an embodiment of the present invention provides a physical layer security configuration apparatus for a CDMA system. As shown in FIG. 4, the apparatus may include: an obtaining unit 31 and a generating unit 32.

The obtaining unit 31 is configured to obtain channel information of a legal user and channel information of an illegal user.

The obtaining unit 31 is further configured to obtain a first matrix corresponding to the legal user according to the channel information of the legal user and the interference noise autocorrelation matrix of the legal user, and according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user. Obtaining a second matrix corresponding to the illegal user;

The generating unit 32 is configured to generate, according to the first matrix and the second matrix, a spreading code group and a transmission power corresponding to the legal user by using a preset iterative algorithm.

It should be noted that the device embodiment corresponds to the foregoing method embodiment. For ease of reading, the device embodiment does not describe the details in the foregoing method embodiments one by one, but it should be clear that the device in this embodiment can Corresponding to implementing all of the foregoing method embodiments.

The physical layer security configuration device of the CDMA system provided by the embodiment of the present invention firstly obtains the channel information of the legal user and the channel information of the illegal user when the physical layer security configuration of the CDMA system needs to be performed, and then according to the channel information of the legal user. And the interference noise autocorrelation matrix of the legal user acquires the first matrix corresponding to the legal user, and obtains the second matrix corresponding to the illegal user according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user, and finally according to the A matrix and the second matrix obtain a spreading code group and a transmission power corresponding to the legal user by using a preset iterative algorithm. The security technology of the existing CDMA system is mainly applied to the upper layer security protocol of the communication system, and relies on the authentication and encryption algorithm to encrypt the information transmitted between the legitimate user and the base station, because the channel is unique in the wireless communication environment. Sexuality and difference, the present invention utilizes the degree of freedom of the base station in the code domain space, realizes the physical layer security protection method of the CDMA system through the iterative manner of the spreading code, and avoids the implementation complexity of the existing CDMA system security technology. High, the problem of large system resource consumption.

Further, as a specific implementation of the method shown in FIG. 3, an embodiment of the present invention provides another physical layer security configuration apparatus for a CDMA system. As shown in FIG. 5, the apparatus may include: an obtaining unit 41 and a generating unit 42.

The obtaining unit 41 is configured to obtain channel information of a legal user and channel information of an illegal user.

The obtaining unit 41 is further configured to obtain a first matrix corresponding to the legal user according to the channel information of the legal user and the interference noise autocorrelation matrix of the legal user, and according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user. Obtaining a second matrix corresponding to the illegal user;

The generating unit 42 is configured to generate, according to the first matrix and the second matrix, a spreading code group and a transmission power corresponding to the legal user by using a preset iterative algorithm.

Further, the generating unit 42 includes:

The determining module 4201 is configured to determine whether the spreading code group and the sending power corresponding to the legal user obtained by the preset iterative algorithm meet the convergence condition corresponding to the preset iterative algorithm, and the convergence condition is two consecutive iterations. The difference between the obtained difference between the spreading codes and the transmission power energy is less than or equal to a preset threshold;

The output module 4202 is configured to: if yes, output the spreading code group and the sending power;

The obtaining module 4203 is configured to obtain, according to the first matrix and the second matrix, a spreading code group and a transmission power corresponding to the legal user by using a preset Rayleigh quotient quantization algorithm.

Further, the acquiring module 4203 is specifically configured to: if there is a legitimate user that does not acquire the spreading code group and the sending power, according to the current

For the second matrix, j is the current number of iterations;

According to the formula

Update the first matrix and according to the formula

Update the second matrix

among them,

For the first matrix, H _k is the multipath channel matrix of the transmitting end and the kth legitimate user, H _e is the multipath channel matrix of the illegal user, and E _i represents the bit energy of the ith user transmitting signal,

Represents the spread spectrum waveform of the ith user, c _k represents interference from other users in the environment, and n _k is Gaussian white noise;

Select from P ^j to meet the power limit

And meet the minimum Rayleigh quotient

And transmit power, and remove the spreading code from the candidate set P ^j

The spreading code group and the transmission power of the legal user are obtained according to the spreading code and the transmission power of each legal user.

Further, the determining module 4201 is further configured to determine whether the current number of iterations is less than or equal to a preset threshold;

If yes, it is determined whether the current spreading code group and the transmission power corresponding to the legal user obtained by the preset iterative algorithm meet the convergence condition corresponding to the preset iterative algorithm.

Further, the generating unit 42 further includes:

The configuration module 4204 is configured to reconfigure the order of the legitimate users if the current iteration number is greater than the preset threshold and does not meet the convergence condition corresponding to the preset iteration algorithm.

Further, the obtaining unit 41 is specifically configured according to a formula

Obtaining a first matrix corresponding to the legitimate user, wherein the first matrix Q _k corresponding to a legitimate user, the channel information H _k is a legitimate user, R _k is a legitimate user interference noise autocorrelation matrix;

The obtaining unit 41 is specifically used according to a formula

Further, the obtaining unit 41 is further configured to acquire channel information of the legal user and channel information of the illegal user according to the preset training signal.

Another physical layer security configuration device of the CDMA system provided by the embodiment of the present invention, when the physical layer security configuration of the CDMA system needs to be performed, first acquires channel information of the legal user and channel information of the illegal user, and then according to the channel of the legal user. Acquiring the first matrix corresponding to the legal user by the interference noise autocorrelation matrix of the legal user, and acquiring the second matrix corresponding to the illegal user according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user, and finally according to the The first matrix and the second matrix obtain a spreading code group and a transmission power corresponding to the legal user by using a preset iterative algorithm. The security technology of the existing CDMA system is mainly applied to the upper layer security protocol of the communication system, and relies on the authentication and encryption algorithm to encrypt the information transmitted between the legitimate user and the base station, because the channel is unique in the wireless communication environment. Sexuality and difference, the present invention utilizes the degree of freedom of the base station in the code domain space, realizes the physical layer security protection method of the CDMA system through the iterative manner of the spreading code, and avoids the implementation complexity of the existing CDMA system security technology. High, the problem of large system resource consumption.

The physical layer security configuration device of the CDMA system includes a processor and a memory. The acquisition unit, the generation unit, and the like are all stored as a program unit in a memory, and the program unit stored in the memory is executed by the processor to implement a corresponding function.

The processor contains a kernel, and the kernel removes the corresponding program unit from the memory. The kernel can be set to one or more. By adjusting the kernel parameters, the limitations of the existing interference technology are higher and the difficulty is realized.

The memory may include non-persistent memory, random access memory (RAM), and/or non-volatile memory in a computer readable medium, such as read only memory (ROM) or flash memory (flash RAM), the memory including at least one Memory chip.

The present application also provides a computer program product, when executed on a data processing device, adapted to perform program code for initializing the following method steps: obtaining channel information of a legitimate user and channel information of an illegal user; The information and the interference noise autocorrelation matrix of the legal user acquire the first matrix corresponding to the legal user, and obtain the second matrix corresponding to the illegal user according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user; A matrix and the second matrix obtain a spreading code group and a transmission power corresponding to the legal user by using a preset iterative algorithm.

Those skilled in the art will appreciate that embodiments of the present application can be provided as a method, system, or computer program product. Thus, the present application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment in combination of software and hardware. Moreover, the application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) including computer usable program code.

The present application is described with reference to flowchart illustrations and/or block diagrams of a physical layer security configuration method, apparatus, and computer program product of a CDMA system in accordance with an embodiment of the present application. It will be understood that each of the flows and/or blocks, and the flowcharts and/or A combination of processes and/or blocks in the figures. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

The computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture comprising the instruction device. The apparatus implements the functions specified in one or more blocks of a flow or a flow and/or block diagram of the flowchart.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.

The memory may include non-persistent memory, random access memory (RAM), and/or non-volatile memory in a computer readable medium, such as read only memory (ROM) or flash memory. Memory is an example of a computer readable medium.

Computer readable media includes both permanent and non-persistent, removable and non-removable media. Information storage can be implemented by any method or technology. The information can be computer readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read only memory. (ROM), electrically erasable programmable read only memory (EEPROM), flash memory or other memory technology, compact disk read only memory (CD-ROM), digital versatile disk (DVD) or other optical storage, Magnetic tape cartridges, magnetic tape storage or other magnetic storage devices or any other non-transportable media can be used to store information that can be accessed by a computing device. As defined herein, computer readable media does not include temporary storage of computer readable media, such as modulated data signals and carrier waves.

The above is only an embodiment of the present application and is not intended to limit the application. For those skilled in the art As such, there are various changes and variations to this application. Any modifications, equivalents, improvements, etc. made within the spirit and scope of the present application are intended to be included within the scope of the appended claims.

Claims

A physical layer security configuration method for a CDMA system, comprising:

Obtaining channel information of a legitimate user and channel information of an illegal user;

Acquiring the first matrix corresponding to the legal user according to the channel information of the legal user and the interference noise autocorrelation matrix of the legal user, and acquiring the second matrix corresponding to the illegal user according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user ;

And obtaining, according to the first matrix and the second matrix, a spreading code group and a transmission power corresponding to the legal user by using a preset iterative algorithm.
The physical layer security configuration method of the CDMA system according to claim 1, wherein the generating, according to the first matrix and the second matrix, a spreading code corresponding to the legal user by using a preset iterative algorithm Group and transmit power include:

Determining whether the current spreading code group and the transmission power corresponding to the legal user obtained by the preset iterative algorithm meet the convergence condition corresponding to the preset iterative algorithm, and the convergence condition is a spreading code obtained by two consecutive iterations. The difference between the difference between the difference and the power of the transmission power is less than or equal to a preset threshold;

If yes, outputting the spreading code group and the transmission power;

If not, obtaining a spreading code group and a transmission power corresponding to the legal user by using a preset Rayleigh quotient algorithm according to the first matrix and the second matrix.
The physical layer security configuration method of the CDMA system according to claim 2, wherein the obtaining, by the preset Rayleigh quotient algorithm, the corresponding user according to the first matrix and the second matrix The spreading code group and transmission power include:

If there is a legitimate user who does not acquire the spreading code group and the transmission power, then according to
Generating an alternative set of spreading code groups P j =[p 1 ,p 2 ,...,p k ], wherein
For the second matrix, j is the current number of iterations;

According to the formula
Update the first matrix and according to the formula
Update the second matrix
among them,
For the first matrix, H k is the multipath channel matrix of the transmitting end and the kth legitimate user, H e is the multipath channel matrix of the illegal user, and E i represents the bit energy of the ith user transmitting signal,
Represents the spread spectrum waveform of the ith user, c k represents interference from other users in the environment, and n k is Gaussian white noise;

Select from P j to meet the power limit
And meet the minimum Rayleigh quotient
The spreading code and transmission power of the value condition are used as the spreading code of the kth legal user.
And transmit power, and remove the spreading code from the candidate set P j

If there is no legal user that does not obtain the spreading code group and the transmission power, the spreading code group and the transmission power of the legal user are obtained according to the spreading code and the transmission power of each legal user.
The physical layer security configuration method of the CDMA system according to claim 2, wherein the determining whether the spreading code group and the transmission power corresponding to the legal user obtained by the preset iterative algorithm meet the preset Before the convergence condition corresponding to the iterative algorithm, the method further includes:

Determining whether the current number of iterations is less than or equal to a preset threshold;

If yes, it is determined whether the current spreading code group and the transmission power corresponding to the legal user obtained by the preset iterative algorithm meet the convergence condition corresponding to the preset iterative algorithm.
The MIMO system-based interference signal configuration method according to claim 4, wherein the method further comprises:

If the current number of iterations is greater than the preset threshold and does not meet the convergence condition corresponding to the preset iterative algorithm, reconfigure the order of the legitimate users.
The physical layer security configuration method of the CDMA system according to claim 1, wherein the obtaining the first matrix corresponding to the legal user according to the channel information of the legal user and the interference noise autocorrelation matrix of the legal user includes:

According to the formula
Obtaining a first matrix corresponding to the legal user, where Q k is a first matrix corresponding to the legal user, H k is channel information of the legal user, and R k is an interference noise autocorrelation matrix of the legal user;

The obtaining the second matrix corresponding to the illegal user according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user includes:

According to the formula
Obtaining a second matrix corresponding to the illegal user, wherein, Q ek second matrix corresponding to the illegal user, H e is the channel information of unauthorized users, R ek illegal user interference noise autocorrelation matrix.
The physical layer security configuration method of the CDMA system according to claim 1, wherein the acquiring the channel information of the legal user and the channel information of the illegal user comprises:

Obtaining channel information of the legal user and channel information of the illegal user according to the preset training signal.
A physical layer security configuration device for a CDMA system, comprising:

An acquiring unit, configured to obtain channel information of a legal user and channel information of an illegal user;

The acquiring unit is further configured to obtain a first matrix corresponding to the legal user according to the channel information of the legal user and the interference noise autocorrelation matrix of the legal user, and according to the channel information of the illegal user and the interference noise autocorrelation matrix of the illegal user, Obtaining a second matrix corresponding to the illegal user;

And a generating unit, configured to generate, according to the first matrix and the second matrix, a spreading code group and a sending power corresponding to the legal user by using a preset iterative algorithm.
The physical layer security configuration apparatus of the CDMA system according to claim 8, wherein the generating unit comprises:

The determining module is configured to determine whether the spreading code group and the sending power corresponding to the legal user obtained by the preset iterative algorithm meet the convergence condition corresponding to the preset iterative algorithm, and the convergence condition is obtained by two consecutive iterations. The difference between the difference between the spreading codes and the transmit power energy is less than or equal to a preset threshold;

An output module, if yes, outputting the spreading code group and transmission power;

And an acquiring module, configured to obtain, according to the first matrix and the second matrix, a spreading code group and a sending power corresponding to the legal user by using a preset Rayleigh quotient quantization algorithm.
A physical layer security configuration apparatus for a CDMA system according to claim 9, wherein

The acquiring module is specifically configured to: if there is a legitimate user that does not acquire the spreading code group and the sending power, according to the current
Generating an alternative set of spreading code groups P j =[p 1 ,p 2 ,...,p k ], wherein
For the second matrix, j is the current number of iterations;

According to the formula
Update the first matrix and according to the formula
Update the second matrix
among them,
For the first matrix, H k is the multipath channel matrix of the transmitting end and the kth legitimate user, H e is the multipath channel matrix of the illegal user, and E i represents the bit energy of the ith user transmitting signal,
Represents the spread spectrum waveform of the ith user, c k represents interference from other users in the environment, and n k is Gaussian white noise;

Select from P j to meet the power limit
And meet the minimum Rayleigh quotient
The spreading code and transmission power of the value condition are used as the spreading code of the kth legal user.
And transmit power, and remove the spreading code from the candidate set P j

If there is no legal user that does not obtain the spreading code group and the transmission power, the spreading code group and the transmission power of the legal user are obtained according to the spreading code and the transmission power of each legal user.
A physical layer security configuration apparatus for a CDMA system according to claim 9, wherein

The determining module is further configured to determine whether the current number of iterations is less than or equal to a preset threshold;

If yes, it is determined whether the current spreading code group and the transmission power corresponding to the legal user obtained by the preset iterative algorithm meet the convergence condition corresponding to the preset iterative algorithm.
The apparatus for configuring a physical layer security of a CDMA system according to claim 11, wherein the generating unit further comprises:

And a configuration module, configured to reconfigure the order of the legal users if the current number of iterations is greater than the preset threshold and does not meet the convergence condition of the preset iteration algorithm.
A physical layer security configuration apparatus for a CDMA system according to claim 8, wherein

The obtaining unit is specifically used according to a formula
Obtaining a first matrix corresponding to the legitimate user, wherein the first matrix Q k corresponding to a legitimate user, the channel information H k is a legitimate user, R k is a legitimate user interference noise autocorrelation matrix;

The obtaining unit is specifically used according to a formula
Obtaining a second matrix corresponding to the illegal user, wherein, Q ek second matrix corresponding to the illegal user, H e is the channel information of unauthorized users, R ek illegal user interference noise autocorrelation matrix.
The physical layer security configuration device of the CDMA system according to claim 8, wherein the acquiring unit is further configured to acquire channel information of the legal user and channel information of the illegal user according to the preset training signal.