CN108512584A - A kind of joint method of reseptance in the modulation of direction - Google Patents
A kind of joint method of reseptance in the modulation of direction Download PDFInfo
- Publication number
- CN108512584A CN108512584A CN201810291070.5A CN201810291070A CN108512584A CN 108512584 A CN108512584 A CN 108512584A CN 201810291070 A CN201810291070 A CN 201810291070A CN 108512584 A CN108512584 A CN 108512584A
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- Prior art keywords
- receiving terminal
- signal
- listener
- validated user
- modulation
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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
- H04B7/0615—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 of weighted versions of same signal
- H04B7/0617—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 of weighted versions of same signal for beam forming
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K1/00—Secret communication
- H04K1/02—Secret communication by adding a second signal to make the desired signal unintelligible
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
- H04L27/36—Modulator circuits; Transmitter circuits
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- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Radio Transmission System (AREA)
- Mobile Radio Communication Systems (AREA)
Abstract
Beneficial effects of the present invention are, the present invention provides the joint method of reseptance in a kind of direction modulation.By introducing distortion factor in sending wave beam forming vector so that listener-in is in the signal that any position will all receive distortion.And the distortion factor introduced can change at random, therefore can be further such that listener-in receives signal distortion.Meanwhile the program may make legitimate receiver that can recover transmission symbol using simple detection method.Therefore it is final no matter listener-in be located at where, the bit error rate of listener-in all will be significantly higher than that legitimate receiver.
Description
Technical field
The invention belongs to wireless communication technology field, the joint method of reseptance in specifically a kind of direction modulation.This
Invention be related to phased antenna array (Phased Array, PA) technology and direction modulation (Directional Modulation,
DM) technology.
Background technology
Safety of physical layer technology receives the concern of more and more researchers particularly important today in information security, relatively
In conventional encryption technique, its advantage is that the complexity independent of Encryption Algorithm, but the characteristic of channel is made full use of to ensure
Communication security.One of the hot spot that direction modulation technique is studied as the safety of physical layer communications field in recent years, which is to penetrate
Realize that the direction modulation function of digital communication, the wireless communication signals emitted in this way exist using different radio-frequency structures in frequency end
Signal and base-band digital modulated signal modulated signal space having the same are received in desired orientation, traditional digital receiver is just
The communication information can normally be demodulated；Rather than the relative position relation generation received in desired orientation between signal constellation point is abnormal
Become, to influence the demodulation performance of interception receiver, even if the signal power that eavesdropping termination receives is identical as desired orientation even
Higher also can not accurately restore information.
Conventional modulated technology refers to being converted into various baseband signals to be suitable for the digital modulation signals of transmission, and method is
The variation that certain parameters of control carrier signal are removed with baseband signal, the communication information is loaded on these parameters and forms modulated letter
It number is transmitted.And direction modulation is used as a kind of radio-frequency modulations technology, it with conventional modulated technology difference lies in：Traditional communication
Signal is transmitted with regard to Direct conversion to radio frequency after digital modulation and by antenna array in system, recipient in any direction
The modulated signal of reception is identical, only exists the difference of gain and signal-to-noise ratio, and direction modulation can be such that signal only it is expected
It is consistent with transmitting signal that signal constellation (in digital modulation) figure is received on direction, and amplitude and the distortion in phase occur on unexpected direction.
On the basis of although the research about direction modulation is mostly also built upon phased antenna array before, at this
In a little researchs, it will usually the direction for giving tacit consent to listener-in is different from legitimate receiver direction, however under practical application scene, eavesdropping
Person often be in silent status, that is, listener-in will not outside emitted energy, the position of such listener-in is not known often
, that is, being possible to can be identical with the direction of legitimate receiver, listener-in can decode correct transmission in this case
The transmission of signal, information will become no longer safe.
Invention content
The purpose of the present invention, the joint method of reseptance being just to provide in a kind of modulation of direction, passes through the transmission in DM systems
Distortion factor is introduced in wave beam forming vector so that listener-in is in the signal that any position will all receive distortion.And draw
The distortion factor entered can change at random, therefore can be further such that listener-in receives signal distortion.Meanwhile the program may make conjunction
Method recipient can recover transmission symbol using simple detection method.Therefore it is final no matter listener-in be located at where,
The bit error rate of listener-in all will be significantly higher than that legitimate receiver.
Modulate detailed process in the direction for randomly choosing receiving terminal, which is characterized in that including：
Transmitting terminal：
A, angle measurement：Transmitter carries out angle measurement to each receiving terminal of validated user.
B, channel obtains：Transmitter antenna array uses uniform straight line array, the geometric center of array to be referred to for phase center
Point, then the guiding vector of transmitter array be expressed as：
Wherein, θ is the deflection of receiving terminal, NtIt is transmitter antenna number, λ is signal wavelength, and d is array element spacing.It is legal
The angle of i-th of receiving terminal of user is θi, i=1,2 ..., Nb, wherein NbFor the quantity of validated user receiving terminal, Mei Gejie
Receiving end only has an antenna, and each receiving terminal can be with collaboration communication.Then the channel of validated user is represented by
C, modulates information：Information bit is passed by amplitude phase modulation (amplitude-phase modulation, APM)
It passs.It is b to select the constellation point symbol sentm, m=1,2 ..., M, wherein M are order of modulation, there is assemble of symbol
D, wave beam forming vector design：The corresponding distortion factor of i-th of receiving terminal of validated user is αi, i=1,
2,...,Nb, wherein NbFor the quantity of validated user receiving terminal, sender and legitimate receiver both know about the distortion factor, and
Know the correspondence of the distortion factor and each legitimate receipt end.Sender randomly chooses i-th of receiving terminal so that wave beam pair
The accurate receiving terminal, and the corresponding distortion factor of the receiving terminal is introduced in wave beam forming vector, design wave beam forming vector is
wi=αih(θi)/Nt
The wave beam forming vector can be realized using the combination of radio-frequency head component, also can be by base band signal process come real
It is existing.
E, signal is sent：Antenna sends signal and is represented by xi m=wibm。
Receiving terminal：
F, signal receives：Legal person receives signal and is represented by：
Wherein n is white complex gaussian noise signal phasor, and it is 0 that each element of the vector, which is independent identically distributed mean value, variance σ2
Multiple Gauss variable.Listener-in receives signal and is represented by：Its
Middle nEBe meet mean value be 0, variance σE 2Multiple Gauss variable, θEFor the deflection of listener-in, hH(θE) it is listener-in's channel.
G, signal detection：It is detected using maximum similar (Maximum Likelihood, ML), legal person can
Recover signal：The signal that listener-in recovers is：
Beneficial effects of the present invention are：The present invention provides the joint method of reseptance in a kind of modulation of direction, by DM systems
Distortion factor is introduced in the transmission wave beam forming vector of system so that listener-in is in the letter that any position will all receive distortion
Number；And the distortion factor introduced can change at random, therefore can be further such that listener-in receives signal distortion；Meanwhile the party
Case may make legitimate receiver that can recover transmission symbol using simple detection method；It is therefore final that no matter listener-in is located at
Where, the bit error rate of listener-in all will be significantly higher than that legitimate receiver.
Description of the drawings
Fig. 1 is the algorithm flow chart of the joint method of reseptance in a kind of direction modulation proposed by the present invention；
Fig. 2 is the system model figure of the joint method of reseptance in a kind of direction modulation proposed by the present invention；
Specific implementation mode
The present invention is described in detail with specific implementation below in conjunction with the accompanying drawings, so as to those skilled in the art
More fully understand the present invention.Requiring particular attention is that in the following description, when known function and the detailed of design are retouched
When stating the main contents that perhaps can desalinate the present invention, these descriptions will be ignored herein.
Embodiment
It in this example, is modulated using QPSK, transmitter antenna number Na=32, validated user receiving terminal quantity Nb=2,
Two receiving terminal angles are θ respectively1=15 °, θ2=95 °, the distortion factor corresponding to two receiving terminals is respectively
A, angle measurement：Transmitter carries out angle measurement to each receiving terminal of validated user.
B, channel obtains：Transmitter antenna array uses uniform straight line array, the geometric center of array to be referred to for phase center
Point, then the guiding vector of transmitter array be expressed as：
Wherein, θ is the deflection of receiving terminal, NtIt is transmitter antenna number, λ is signal wavelength, and d is array element spacing.It is legal
The angle of i-th of receiving terminal of user is θi, i=1,2 ..., Nb, wherein NbFor the quantity of validated user receiving terminal, Mei Gejie
Receiving end only has an antenna, and each receiving terminal can be with collaboration communication.Then the channel of validated user is represented by
C, modulates information：Information bit is transmitted by amplitude phase modulation.It is b to select the constellation point symbol sentm, m=1,
2 ..., M, wherein M are order of modulation, there is assemble of symbol
D, wave beam forming vector design：The corresponding distortion factor of i-th of receiving terminal of validated user is αi, i=1,
2,...,Nb, wherein NbFor the quantity of validated user receiving terminal, sender and legitimate receiver both know about the distortion factor, and
Know the correspondence of the distortion factor and each legitimate receipt end.Sender randomly chooses i-th of receiving terminal so that wave beam pair
The accurate receiving terminal, and the corresponding distortion factor of the receiving terminal is introduced in wave beam forming vector, design wave beam forming vector is
wi=αih(θi)/Nt
The wave beam forming vector can be realized using the combination of radio-frequency head component, also can be by base band signal process come real
It is existing.
E, signal is sent：Antenna sends signal and is represented by xi m=wibm。
Receiving terminal：
F, signal receives：Legal person receives signal and is represented by：
Wherein n is white complex gaussian noise signal phasor, and it is 0 that each element of the vector, which is independent identically distributed mean value, variance σ2
Multiple Gauss variable.Listener-in receives signal and is represented by：Its
Middle nEBe meet mean value be 0, variance σE 2Multiple Gauss variable, θEFor the deflection of listener-in, hH(θE) it is listener-in's channel.
G, signal detection：It is detected using ML, legal person can recover signal：
The signal that listener-in recovers is：
The present invention provides the joint method of reseptance in a kind of modulation of direction.Pass through the transmission wave beam forming vector in DM systems
Middle introducing distortion factor so that listener-in is in the signal that any position will all receive distortion.And the distortion factor introduced
It can change at random, therefore can be further such that listener-in receives signal distortion.Meanwhile the program may make legitimate receiver to utilize
Simple detection method can recover transmission symbol.Therefore it is final no matter listener-in be located at where, the error code of listener-in
Rate all will be significantly higher than that legitimate receiver.
Claims (1)
1. the joint method of reseptance in a kind of direction modulation, which is characterized in that include the following steps：
Transmitting terminal：
A, angle measurement：Transmitter carries out angle measurement to each receiving terminal of validated user, obtains the deflection of receiving terminal；
B, channel obtains：Transmitter antenna array uses uniform straight line array, and the geometric center of array is phase center reference point, then
The guiding vector of transmitter array is expressed as：
Wherein, θ is the deflection of receiving terminal, NtIt is transmitter antenna number, λ is signal wavelength, and d is array element spacing；
The angle of i-th of receiving terminal of validated user is θi, i=1,2 ..., Nb, wherein NbFor the number of validated user receiving terminal
Amount sets each receiving terminal and there was only an antenna, and each receiving terminal can be with collaboration communication, then the channel of validated user can indicate
For：
C, modulates information：Information bit is transmitted by amplitude phase modulation；It is b to select the constellation point symbol sentm, m=1,2 ...,
M, wherein M are order of modulation, there is assemble of symbol
D, wave beam forming vector design：The corresponding distortion factor of i-th of receiving terminal of validated user is set as αi, i=1,2 ...,
Nb, wherein NbFor the quantity of validated user receiving terminal, distortion factor is known, and abnormal in sender and legitimate receipt end
Variable factor and the correspondence at each legitimate receipt end are also known；Sender randomly chooses i-th of receiving terminal so that wave beam
It is directed at the receiving terminal, and introduces the corresponding distortion factor of the receiving terminal in wave beam forming vector, design wave beam forming vector
For：
wi=αih(θi)/Nt
E, signal is sent：It is x that antenna, which sends signal,i m=wibm；
Receiving terminal：
F, signal receives：Legal person receives signal：
Wherein n is white complex gaussian noise signal phasor, and it is 0 that each element of the vector, which is independent identically distributed mean value, variance
For σ2Multiple Gauss variable；
Listener-in receives signal：
Wherein nEBe meet mean value be 0, variance σE 2Multiple Gauss variable, θEFor the deflection of listener-in, hH(θE) it is listener-in
Channel；
G, signal detection：Using maximum approx imately-detecting, legal person can recover signal：
The signal that listener-in recovers is：
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810291070.5A CN108512584B (en) | 2018-04-03 | 2018-04-03 | Joint receiving method in direction modulation |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810291070.5A CN108512584B (en) | 2018-04-03 | 2018-04-03 | Joint receiving method in direction modulation |
Publications (2)
| Publication Number | Publication Date |
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| CN108512584A true CN108512584A (en) | 2018-09-07 |
| CN108512584B CN108512584B (en) | 2020-11-13 |
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ID=63380091
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| CN201810291070.5A Expired - Fee Related CN108512584B (en) | 2018-04-03 | 2018-04-03 | Joint receiving method in direction modulation |
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Citations (5)
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|---|---|---|---|---|
| CN104040926A (en) * | 2012-11-19 | 2014-09-10 | 华为技术有限公司 | Modulation mode identification method, sending device, receiving device and system |
| WO2016061114A1 (en) * | 2014-10-13 | 2016-04-21 | Nxgen Partners Ip, Llc | Application of orbital angular momentum to fiber, fso and rf |
| CN106888045A (en) * | 2017-04-05 | 2017-06-23 | 电子科技大学 | A kind of dynamic direction modulator approach based on beam forming |
| CN107231179A (en) * | 2017-06-02 | 2017-10-03 | 南京邮电大学 | Modulate object function in a kind of radio communication direction |
| CN107231180A (en) * | 2017-06-05 | 2017-10-03 | 电子科技大学 | A kind of dynamic direction modulator approach based on beam forming |
-
2018
- 2018-04-03 CN CN201810291070.5A patent/CN108512584B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104040926A (en) * | 2012-11-19 | 2014-09-10 | 华为技术有限公司 | Modulation mode identification method, sending device, receiving device and system |
| WO2016061114A1 (en) * | 2014-10-13 | 2016-04-21 | Nxgen Partners Ip, Llc | Application of orbital angular momentum to fiber, fso and rf |
| CN106888045A (en) * | 2017-04-05 | 2017-06-23 | 电子科技大学 | A kind of dynamic direction modulator approach based on beam forming |
| CN107231179A (en) * | 2017-06-02 | 2017-10-03 | 南京邮电大学 | Modulate object function in a kind of radio communication direction |
| CN107231180A (en) * | 2017-06-05 | 2017-10-03 | 电子科技大学 | A kind of dynamic direction modulator approach based on beam forming |
Non-Patent Citations (2)
| Title |
|---|
| Y. DING等: ""A vector approach for the analysis and synthesis"", 《 IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION》 * |
| 洪涛等: ""一种基于方向调制的双波束扩频安全通信系统"", 《电子与信息学报》 * |
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Granted publication date: 20201113 |