CN109996231A - A kind of secret communication method in multiaerial system - Google Patents
A kind of secret communication method in multiaerial system Download PDFInfo
- Publication number
- CN109996231A CN109996231A CN201910322306.1A CN201910322306A CN109996231A CN 109996231 A CN109996231 A CN 109996231A CN 201910322306 A CN201910322306 A CN 201910322306A CN 109996231 A CN109996231 A CN 109996231A
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- Prior art keywords
- information
- antenna
- sender
- legitimate
- transmission
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/06—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station
- H04B7/0613—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the transmitting station using simultaneous transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B7/00—Radio transmission systems, i.e. using radiation field
- H04B7/02—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas
- H04B7/04—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas
- H04B7/08—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station
- H04B7/0802—Diversity systems; Multi-antenna system, i.e. transmission or reception using multiple antennas using two or more spaced independent antennas at the receiving station using antenna selection
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- 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]
Abstract
The invention proposes the secret communication methods in a kind of multiaerial system.In the present invention, transmitting terminal sends useful data using a subset of its transmission antenna, sends interference data with other antennas.When sending every time, the transmission antenna subset of sender is first randomly choosed by legitimate receipt side, selected antenna subset at transmitting terminal identification is made by way of random precoding.Sender is not necessarily to known channel information, identifies selected antenna subset by energy inspection, then sends useful data by the subset, and send interference data by remaining antenna to confuse potential listener-in.The known antenna subset for sending useful signal in legitimate receipt side, therefore useful information can be recovered.The present invention by the randomness of day line options and precoding and interference information be mixed into considerably increase eavesdropping side crack difficulty, improve the safety that information is transmitted.
Description
1. application field
The present invention relates to the safety of physical layer problems in secure wireless communication, in particular with space-modulation technique and add
The method of Human disturbance is added to devise the secret communication method in a kind of multiaerial system.
2. background technique
Information generally can be by message sink coding, channel coding, transmission, channel decoding and information source solution in communication process
In the stages such as code, traditional wire communication requires communicating pair necessary " wired connection " during transmission, if third party
There is no " wired connection " that information cannot be obtained, and once connects the data for being possible to steal communicating pair completely.Therefore, have
Line communication must be ensured information safety other than channel by the method for data encryption, this is by message sink coding guarantee in fact
Information security.However, in a wireless communication system, the opening of the broadcast characteristic and wireless channel propagated due to electromagnetic signal,
Signal is arbitrarily propagated in space by radio wave, loses the constraint of " wired ", so that arbitrarily in coverage area
Receiver does not need that the information that transmitter is emitted can be received, the communication information is easily by the legal phase using any line
Other illegal users hoped other than user obtain.Therefore in this sense, wireless communication system has than conventional wired systems
There is bigger security risk.Therefore in wireless communications, how to ensure the safety of information, prevent the wireless leakage of information,
It becomes increasingly important.
Therefore generally speaking, although wireless communication gets rid of wired constraint, its telecommunication media opened is to wireless
The safety of communication brings huge hidden danger.In development process, people constantly design the encryption technology of various complexity to letter
Breath is protected.But other than tradition is based on the safety method of key, also increasingly concern is based on physics for academia in recent years
For layer characteristic come the problem of realizing safe transmission, safety of physical layer (physical-layer secrecy) is Wyner from information theory
What angle was put forward for the first time.It realizes safety of physical layer, mainly utilizes the physical characteristic of channel.Around safety of physical layer, have
Many research achievements, wherein being much all based on multiple antennas, main includes being based on the methods of precoding, man made noise.
Spatial modulation is one kind of multi-antenna technology, and traditional spatial modulation main thought is by selecting transmission antenna
Different subsets transmit a part of information, but spatial modulation also include by other means selection antenna index come directly or
Indirect transfer information, different (characteristic of channel matrix is different) the Lai Jinhang information in spatial position using antenna are transmitted.For difference
Recipient for, the characteristic of channel and transmission or receiving antenna subset have close relationship with the physical location of recipient.
This point explanation, spatial modulation have spatial position sensibility.
Therefore difference is set when use space modulation technique with legitimate receipt orientation for eavesdropping side, the information of acquisition exists
Difference can inspire us for safe transmission, and furthermore man made noise's mode classical in safety of physical layer is to send signal
Middle addition does not influence legitimate receipt side but man made noise influential on eavesdropping side, and this measure has inspired us to combine spatial modulation
And Human disturbance technology realizes secret communication, some in the information of transmission is interference information, legal reciever can be just
Really restore useful information, but eavesdropping side can not differentiate, and be difficult to crack.
3. summary of the invention and feature
The invention proposes the secret communication methods in a kind of multiaerial system.
In the present invention, normal communication both sides are that sender (is equipped with NaRoot antenna) and legitimate receipt side (outfit NbRoot antenna),
Illegal third party, that is, listener-in, furthermore sender and legitimate receipt side can carry out two-way communication.The transmission of data all follow with
Lower step: firstly, legitimate receipt side chosen by space-modulation technique sender several antennas (antenna radical and serial number
Selection is random).Secondly, sender's start information transmits, the normal transmission information on selected antenna, and other antennas are sent
Useless interference data.It is detected when legitimate receipt side receives information, due to the transmission antenna subset of known useful signal,
It can get correct useful information.
Specific step is as follows:
A) before transmitting, legitimate receipt side will randomly choose one group of serial number --- A1,A2,…,Al, wherein each element is
From 1 to NaThe number randomly selected and without repeating, the number that number l is randomly generated meets 1≤l≤Na；
B) legitimate receipt side sends signal to sender using space-modulation technique, so that this several antennas of sender receive
To energy it is sufficiently large be at state of activation, choose the serial number A of sender to represent1,A2,…,AlAntenna.
C) sender is in receiving state signal, detects the energy of every antenna, judges whether to be active, know
Selected antenna, sender switchs to send signal condition at this time, and legitimate receipt side switchs to receiving state signal.
D) sender starts formally to transmit information, antenna serial number A to legitimate receipt side1,A2,…,AlTransmission antenna pass
Sending is useful information, and what other antennas were sent is useless interference information.
E) legitimate receipt side using certain MIMO detection algorithm carry out data recovery, due to legitimate receipt know it is only orderly
Number be A1,A2,…,AlAntenna sends is useful information, therefore correct information can be recovered.
Since the signal that sender sends is propagated by wireless space, listener-in may intercept and capture transmission signal.Due to having one
Transmission antenna transmission in part is useless interference information, so if eavesdropping side cannot obtain the serial number of useful antenna or obtain
The serial number taken is wrong, the information bit error rate received can higher and data will appear confusion.In order to obtain selected transmission day
Line sequence number, it is that legitimate receipt side is sent to sender which information eavesdropping side, which needs to differentiate in time, since space tune is utilized
Technology processed, such signal, can not be by measuring it for eavesdropping side for legitimate receipt side to sender's channel design
The energy of antenna is eavesdropped to know the antenna serial number chosen, therefore eavesdropping side needs to know the channel information of recipient and sender
H, even so due to the effect of noise and the limitation of space dimensionality, listener-in is also difficult to know the information really sent.It is based on
This, the present invention realizes the purpose that the not stolen hearer of the information comprising sender intercepts and captures.
The present invention is compared with currently used safety of physical layer technology, and step is simple, and complexity is low, is done using artificial increase
The mode disturbed and the randomness wherein having all crack increase difficulty to eavesdropping side, are only passed using spatial modulation compared with traditional
The safety approach of breath of delivering letters has higher transmission rate.In addition, the present invention can also with existing some technologies are Chong Die makes at present
With, such as the cryptographic technique in upper layer security, man made noise's technology in safety of physical layer etc..
4. Detailed description of the invention
(1) Fig. 1 is schematic diagram of a scenario of the invention.
(2) Fig. 2 is the flow diagram of the method for the present invention.
(3) Fig. 3 is a kind of schematic diagram for being generated using space-modulation technique and sending signal activation receiving antenna example.
5. specific implementation method is illustrated
An implementation example is given below in implementation method in order to further illustrate the present invention.This example is only indicated to this
The schematic illustration of invention does not represent any restrictions of the invention.
Assuming that certain sender is Alice, there are four antennas, recipient Bob there are four antennas.Sender Alice wants
0100 information is sent to recipient Bob by wireless channel.According to the present invention, it is specifically done with reference to Fig. 2 to what is received and sent messages
Method is described as follows:
S001 Bob from 1 to 4 in randomly select number, it is assumed that extracted two numbers, respectively 1 and 3；
S002 Bob, which is generated, sends signal s, and the condition that transmission signal needs meet is: so that receiving antenna 1 and 3 is swashed
It is living.Assuming that the channel matrix of Bob to Alice is H, then meet Hs=[y1,y2,y3,y4]TWherein y2,y4As small as possible and y1,y3
> Δ (Δ is that state of activation obtains decision threshold), i.e. Bob designs precoding using random fashion according to channel information, so that by
The energy that transmission signal after precoding receives the selected receiving antenna to be activated is as big as possible, other are not selected
The energy of receiving antenna is as small as possible.Such as Fig. 3 describes a kind of step of the design method for transmission signal that Bob can be used
Suddenly, this is optimized precoding using decision threshold value, and sends signal set infinitely set and send every time
Signal has certain randomness, enhances safety.Bob issues signal by four transmission antennas, is passed by wireless channel
Give Alice.
S003 Alice receiving antenna receives signal, and detects to the energy of every antenna.Alice according to setting in advance
Fixed thresholding judges the state of activation of every antenna, and when the energy that certain root antenna receives is greater than or equal to threshold value, then determining should
Antenna is activated, if being lower than, determines that the antenna is not activated, to obtain the serial number 1,3 of the antenna selected.
S004 Alice is modulated using QPSK, useful information 0100 is transmitted on the antenna of serial number 1,3, in 2,4 antennas
The upper random interference information that generates is transmitted, for cheating listener-in.
S005 Bob receives signal, recovers correct useful information.
Claims (7)
1. the secret communication method in a kind of multiaerial system, sender and legitimate receipt Fang Jun configure multiple antennas, legal transmission
Data are transmitted by means of the present invention in side and legitimate receipt side, can prevent the side's of eavesdropping hijack legitimate information.Feature of the invention
It is following steps:
A) before sending every time, legitimate receipt side will randomly choose the subset of the transmission antenna of sender.
B) legitimate sender carries out precoding to signal is sent using space-modulation technique, activates transmission antenna selected
Collection.
C) legitimate sender is in receiving state signal, detects the energy of every antenna, judges whether to be active, know
Selected antenna subset.
D) legitimate sender starts formally to transmit information to legitimate receipt side, and the antenna subset being activated carries out useful information biography
It is defeated, and other antennas send random interference information.
E) the transmission antenna subset of useful signal known to legitimate receipt side recovers useful information using multiple antennas detection algorithm.
2. the method according to claim 1, wherein the legitimate sender, legitimate receipt side, eavesdropping side, are
Refer to the equipment that can be wirelessly transferred or people or object using the equipment.
3. the method according to claim 1, wherein the legal information, refers to that sender is quasi- and sends reception to
The information of side.
4. the method according to claim 1, wherein the precoding, refers in known channel state information
In the case of, by doing a preparatory processing in signal of the transmitting terminal to transmission, to facilitate receiver to carry out signal detection.
5. the method according to claim 1, wherein the activation, refers to so that the received energy of antenna is higher than
The behavior of certain numerical value or thresholding.
6. referring to the method according to claim 1, wherein other described antennas send random interference information
The not selected antenna for sending useful information also carries out information transmission, the letter unrelated with legal information of transmission being randomly generated
Breath, has identical modulation system with legal information.
7. the method according to claim 1, wherein the detection algorithm, refers in multiaerial system for believing
Number detection technology.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910322306.1A CN109996231A (en) | 2019-04-22 | 2019-04-22 | A kind of secret communication method in multiaerial system |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910322306.1A CN109996231A (en) | 2019-04-22 | 2019-04-22 | A kind of secret communication method in multiaerial system |
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| CN109996231A true CN109996231A (en) | 2019-07-09 |
Family
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| CN201910322306.1A Pending CN109996231A (en) | 2019-04-22 | 2019-04-22 | A kind of secret communication method in multiaerial system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110445522A (en) * | 2019-07-16 | 2019-11-12 | 北京邮电大学 | A kind of safe transmission method based on transmission antenna index precoding in multiaerial system |
| CN110855328A (en) * | 2019-10-25 | 2020-02-28 | 西安交通大学 | Differential spatial modulation method, device and storage medium based on antenna grouping |
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| US20080049820A1 (en) * | 2006-08-22 | 2008-02-28 | Nortel Networks Limited | Multi-antenna scheduling system and method |
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| CN106357373A (en) * | 2016-08-30 | 2017-01-25 | 湖南国天电子科技有限公司 | Security transmission method, based on man made noise, of spatially modulated physical layer |
| CN107359892A (en) * | 2017-06-09 | 2017-11-17 | 华南理工大学 | A kind of method that safety of physical layer is realized based on distributing antenna system |
| CN108683443A (en) * | 2018-05-11 | 2018-10-19 | 北京邮电大学 | A kind of spatial modulation safe transmission method of physical layer based on kernel |
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2019
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US20080049820A1 (en) * | 2006-08-22 | 2008-02-28 | Nortel Networks Limited | Multi-antenna scheduling system and method |
| CN105119645A (en) * | 2015-09-15 | 2015-12-02 | 国网山东省电力公司莱芜供电公司 | Receiving antenna space hopping secret communication method in MIMO system |
| CN106357373A (en) * | 2016-08-30 | 2017-01-25 | 湖南国天电子科技有限公司 | Security transmission method, based on man made noise, of spatially modulated physical layer |
| CN107359892A (en) * | 2017-06-09 | 2017-11-17 | 华南理工大学 | A kind of method that safety of physical layer is realized based on distributing antenna system |
| CN108683443A (en) * | 2018-05-11 | 2018-10-19 | 北京邮电大学 | A kind of spatial modulation safe transmission method of physical layer based on kernel |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110445522A (en) * | 2019-07-16 | 2019-11-12 | 北京邮电大学 | A kind of safe transmission method based on transmission antenna index precoding in multiaerial system |
| CN110445522B (en) * | 2019-07-16 | 2020-11-27 | 北京邮电大学 | Safe transmission method based on sending antenna index precoding in multi-antenna system |
| CN110855328A (en) * | 2019-10-25 | 2020-02-28 | 西安交通大学 | Differential spatial modulation method, device and storage medium based on antenna grouping |
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Application publication date: 20190709 |