CN109120570A - A kind of antenna subset direction modulator approach - Google Patents
A kind of antenna subset direction modulator approach Download PDFInfo
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- CN109120570A CN109120570A CN201811029557.2A CN201811029557A CN109120570A CN 109120570 A CN109120570 A CN 109120570A CN 201811029557 A CN201811029557 A CN 201811029557A CN 109120570 A CN109120570 A CN 109120570A
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- 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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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04K—SECRET COMMUNICATION; JAMMING OF COMMUNICATION
- H04K3/00—Jamming of communication; Counter-measures
- H04K3/80—Jamming or countermeasure characterized by its function
- H04K3/82—Jamming or countermeasure characterized by its function related to preventing surveillance, interception or detection
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Abstract
The invention belongs to the array signal processing fields in the communication technology, are used in the transmission for needing to carry out anti-eavesdrop communication, particularly relate to a kind of novel antenna subset direction modulator approach.The present invention picks out the constellation point antenna subset reversed in the maximum several groups of phases of undesired direction deterioration degree using EVM, constellation point can be made to reach maximum in the distortion of undesired direction, so that anti-eavesdrop be better achieved.Core of the invention thought is to pick out to reach the antenna subset of maximum several groups of reverse-phases in unexpected direction constellation point distortion using EVM.
Description
Technical field
The invention belongs to the array signal processing fields in the communication technology, are used in the transmission for needing to carry out anti-eavesdrop communication
In, particularly relate to a kind of novel antenna subset direction modulator approach.
Background technique
The development and application of wireless communication technique bring very big convenience to life, since wireless communication is an opening
System, while bringing convenience, safety is also one and is worthy of consideration and solves the problems, such as it.It is wanted with to information security
The continuous development of the raising and Eavesdropping asked, traditional safety method is by increasing challenge, traditional safe skill
Art urgently enhances.The content that safety of physical layer technical research direction is related to is having the same in interception receiver and expectation reception
Under conditions of wireless communication signals demodulation method, how physical layer realize wireless communication information be securely transmitted to receiver,
Rather than realize wireless communication information in the safe transmission of physical layer by the methods of upper layer encryption technology or secure communication protocol.
Safety of physical layer technology becomes the research hotspot of field of communication security at present.
There is only the difference of signal-to-noise ratio, the lattice of signal in all directions for the signal of traditional wireless communication transmitter transmitting
Formula is completely the same, and the listener-in positioned at undesired direction can be realized as cutting for confidential information using highly sensitive receiver
It obtains, for this case come in recent years, multiple antennas transmitting-receiving array is applied to the safety of physical layer communications field by researcher, is proposed
Direction modulation technique.The technology is using multi-antenna transmission array in wireless communication system directly in the comprehensive side of having provided of antenna end
To the digital modulation signals of characteristic, safety issue of the communication information in transmission process is solved from signal modulation angle.Direction
Modulated signal has very strong directionality, and the wireless communication signals of transmitting are opposite between desired azimuth reception signal constellation point
Phase relation is identical as baseband digital modulated signal, and legitimate user can normal demodulated received signal；And undesired orientation is eavesdropped
Receiver receives the relative phase relation between signal constellation point and generates distortion, and listener-in can not demodulate communication from receiving in signal
Information.
Direction modulating system can make the signal constellation (in digital modulation) figure in non-targeted direction generate distortion.For with the equal of N root antenna
For even linear phased array, if therefrom randomly selecting the reversion that M root asymmetrical antenna carries out phase as antenna subset, remaining day
The phase of line remains unchanged.Antenna subset is chosen anyway, and desired planisphere can be integrated out in desired orientation, and non-
Desired orientation signal constellation (in digital modulation) figure will appear different degrees of distortion (as shown in Fig. 1).
Summary of the invention
The object of the present invention is to propose one newly to reach preferably distortion effect and improve the utilization rate of antenna
Thinking: pick out the constellation point antenna subset reversed in the maximum several groups of phases of undesired direction deterioration degree using EVM, can
So that constellation point reaches maximum in the distortion of undesired direction, so that anti-eavesdrop be better achieved.Core of the invention thought is
It is picked out using EVM and reaches the antenna subset of maximum several groups of reverse-phases in unexpected direction constellation point distortion.
The technical scheme is that
A kind of novel antenna subset direction modulator approach, which comprises the following steps:
S1, modulation constellation is divided into amplitude A MP and phase PHASE two parts, i.e., single constellation point value is AMP (x)
ejPHASE(x), wherein x is x-th of constellation point；
S2, transmitting signal is formed in antenna end, method particularly includes:
S21, phased array antenna phase shifter phase value is simulated by rationally setting, reaches desired orientation to compensate different antennae
Phase shift, representation is as shown in formula 1:
Wherein, θTIndicate desired orientation；For propagation constant, λ is transmitting signal wavelength；
Indicate k-th of array element into array
The distance of heart phase reference point.
S22, in the even linear array with N root antenna, randomly select several groups need to carry out phasing back antenna
Collection, wherein every group of antenna subset includes M root asymmetrical antenna.It is hereby achieved that the signal of antenna transmitting terminal are as follows:
Wherein b (x) indicates that the several groups chosen need to carry out the antenna subset of phasing back.h′(θT) indicate into phase excessively
Phased array antenna phase shifter phase value, representation and phase-shift value are simulated after reversionRepresentation it is as follows:
S3, the best several groups antenna subset of performance is picked out using the signal received, method particularly includes:
S31, it can be expressed as due to channel vector
Along azimuth angle theta, ignore the influence of noise, form of x-th of symbol in receiving end can indicate are as follows:
If azimuth angle theta at this time is desired orientation, reception signal at this time is y (x, θT)=APM (x) ejPHASE(x)；
S32, it is calculated in unexpected direction constellation point using the signal that EVM algorithm respectively receives every group of antenna subset
Distortion degree:
Wherein, L is the number of scan points between 50~70 °；
S33, the reversed antenna subset in direction corresponding to the maximum several values of EVM is found out, illustrates this several groups of antenna subsets
It is to make x-th of constellation point in the maximum antenna subset of undesired direction distortion degree in the several groups antenna subset randomly selected,
Namely emit several groups of best antenna subsets of x-th of constellation point performance.
The beneficial effects of the present invention are: method of the invention has stronger safety relative to traditional technology.Random
It is found out using EVM algorithm so that each constellation point is in undesired direction distortion most serious in the antenna subset of the reverse-phase of generation
Antenna subset further ensure the safety of desired orientation so that the bit error rate in undesired direction reaches maximum value.Together
When, the present invention only needs to calculate an EVM value to each constellation point during screening optimal antenna subset, to greatly subtract
Computation complexity is lacked.
Detailed description of the invention
Fig. 1 is that figure is modulated in the direction based on antenna subset.The figure illustrates random from N root antenna by taking QPSK signal as an example
When choosing antenna subset of the M root antenna as phasing back, the constellation point of baseband signal out can be accurately integrated in desired orientation,
And so that constellation point is generated distortion in undesired direction, play the effect of anti-eavesdrop.
Fig. 2 is that 16QAM signal passes through EVM curve and 16QAM of the optimal antenna subset filtered out within the scope of 50~70 °
Signal passes through the contrast schematic diagram of EVM curve of the antenna subset picked out at random within the scope of 50~70 °.
Fig. 3 is that 16QAM signal shows by different antennae subset in the comparison of the constellation point and standard constellation point of different angle
It is intended to.
Fig. 4 is that 16QAM signal passes through BER curve and 16QAM of the optimal antenna subset filtered out within the scope of 50~70 °
The contrast schematic diagram of BER curve of the antenna subset that signal goes out by random screening within the scope of 50~70 °.
Specific embodiment
With reference to the accompanying drawings and examples, the technical schemes of the invention are described in detail:
By taking 16QAM modulation constellation as an example, this example the following steps are included:
S1: generating the constellation point of 16QAM signal, and x-th of constellation point is expressed as
S2: transmitting signal is formed in antenna end, the specific steps are as follows:
S21, initial phase is set in antenna end, to compensate the phase shift that different antennae reaches desired orientation, representation is such as
Shown in lower:
Assuming that antenna array columns is N=100, desired orientation θT=60 °, array element spacing is λ/2, and reference coordinate origin is battle array
First center；
S22, in the uniform array with N root antenna, 100 groups of antenna subsets are randomly selected, wherein every group of antenna subset
Include M=51 root asymmetrical antenna.It is hereby achieved that the signal of antenna transmitting terminal are as follows:
Wherein, b (k, x) represents the antenna subset of the kth group reverse-phase randomly selected when sending x-th of constellation point, k ∈
[1,100]。
S3: picking out the best several groups antenna subset of performance using the signal received, method particularly includes:
S31, it can be indicated due to channel vector are as follows:
Therefore, in any receiving direction θ, ignore the influence of noise, receiving end is comprehensive to x-th of the constellation point received
The result arrived are as follows:
Receiving direction herein is set as 50~70 °, and sweep spacing is 0.1 °；
S32, it is calculated in undesired direction star to the comprehensive constellation point out of 100 groups of antenna subsets respectively using EVM algorithm
The distortion degree of seat point:
L=201 herein represents 201 scanning elements between 50~70 °；
S33, to each constellation point100 EVM be ranked up, find out EVM value maximum 10 groups of antennas
Collection.This 10 groups of antenna subsets picked out are the antenna subset for sending x-th of constellation point best performance, use antenna
Collection sends constellation pointWhen, it can be in desired orientation θTLocate accurate synthetical baseband constellation point, and it is comprehensive in undesired direction
Constellation point out can then generate maximum distortion, reach better anti-eavesdrop effect.
It is of the invention further to verify below by other related algorithms with the algorithm performance comparative analysis of the method for the present invention
Performance.
Carry out the validity of metric algorithm using three aspects, one is the 10 groups of best performances picked out by this method
The comparison of the obtained EVM curve of antenna subset and the obtained EVM curve of 10 groups of antenna subsets selected at random verify
Effect based on the modulation of preferred antenna subset direction；One is that compare different antennae subset opposite in the constellation point of different angle
In the distortion degree of standard constellation point；One be the 10 groups of best performances picked out by this method antenna subset it is obtained
The direction tune of this method realization is verified in the comparison of BER curve and 10 groups of obtained BER curves of antenna subset selecting at random
The safety of system is more effective.
Fig. 2 is the constellation point filtered out using this methodCorresponding performance
The comparison of 10 groups of optimal antenna subsets and the EVM curve for the 10 groups of antenna subsets selected at random.The wherein red curve looped
Indicate 10 groups of best antenna subsets of performance, 10 groups of antenna subsets that the curve of blue triangle is indicated and selected at random.It can be bright
Aobvious to find out, compared with the 10 groups of antenna subsets selected at random, 10 groups of best antenna subsets of performance are when closer to desired orientation
The distortion of generation is bigger, and distortion is reduced rapidly and tends to 0. when close to desired orientation
Fig. 3 is the 100 groups of antenna subsets comprehensive constellation point come out and standard constellation on 58 ° and 65 ° of two different directions
The contrast schematic diagram of point.Wherein red to beat star be standard constellation point, comprehensive constellation point out when being 58 ° that purple is looped, black
Color is looped when being 65 ° it is comprehensive go out constellation point.It can be seen that constellation point occur in the two undesired directions it is apparent abnormal
Become, and the distortion degree of the comprehensive constellation point out of antenna subset of better performances is far longer than the poor antenna subset synthesis of performance
The distortion degree of constellation point out.
Fig. 4 is the best antenna subset of 10 groups of performances screened using this method and 10 groups of antennas selected at random
Collection sends the ber curve that same group of data demodulates.Wherein channel is Gaussian channel and SNR=10db.What blue was looped
For ber curve corresponding to the best antenna subset of performance, red beat star be with corresponding to the antenna subset selected at random
Ber curve.As can be seen that the bit error rate that the best antenna subset of performance demodulates is obviously big when close to desired orientation
In the worst antenna subset of performance.And when leveling off to desired orientation, under the bit error rate of the best antenna subset of performance is rapid
It drops and levels off to 0.
In conclusion the invention proposes a kind of novel antenna subset direction modulator approaches.By algorithm to random choosing
Antenna subset out is further deleted choosing, using every group of antenna subset in scanning range calculated EVM value as delete choosing
Standard therefrom selects several groups of best antenna subsets of performance, and this novel direction modulator approach is compared to traditional direction tune
Method processed has narrower wave beam, further improves the safety and reliability of system；Transmitting terminal day is substantially increased simultaneously
The utilization rate of line, reduces costs.Algorithm proposed by the present invention can preferably realize direction tune in the case where low complex degree
The safety of system.
Claims (1)
1. a kind of antenna subset direction modulator approach, which comprises the following steps:
S1, modulation constellation is divided into amplitude A MP and phase PHASE two parts, i.e., single constellation point value is AMP (x) ejPHASE (x), wherein x is x-th of constellation point；
S2, transmitting signal is formed in antenna end, method particularly includes:
S21, phased array antenna phase shifter phase value is simulated by setting, to compensate the phase shift that different antennae reaches desired orientation,
Representation is as shown in formula 1:
Wherein, θTIndicate desired orientation；For propagation constant, λ is transmitting signal wavelength；
Indicate k-th of array element to array center
The distance of phase reference point, N are antenna array columns；
S22, in the even linear array with N root antenna, randomly select the antenna subset that several groups need to carry out phasing back,
In every group of antenna subset include M root asymmetrical antenna, obtain the signal of antenna transmitting terminal are as follows:
Wherein b (x) indicates that the several groups chosen need to carry out the antenna subset of phasing back, h ' (θT) indicate into phasing back excessively
Phased array antenna phase shifter phase value, representation and phase-shift value are simulated afterwardsRepresentation it is as follows:
S3, the best several groups antenna subset of performance is picked out using the signal received, method particularly includes:
S31, channel vector are expressed as
Along azimuth angle theta, ignore the influence of noise, form of x-th of symbol in receiving end indicates are as follows:
Wherein,For effect of the antenna subset progress phase after reversed；
If azimuth angle theta at this time is desired orientation, reception signal at this time is y (x, θT)=APM (x) ejPHASE(x)；
S32, it is calculated in the abnormal of unexpected direction constellation point using the signal that EVM algorithm respectively receives every group of antenna subset
Change degree:
Wherein, L is the number of scan points between 50~70 °；
S33, find out the reversed antenna subset in direction corresponding to the maximum several values of EVM, indicate this several groups of antenna subsets be with
Make x-th of constellation point in the maximum antenna subset of undesired direction distortion degree in the several groups antenna subset that machine is chosen, also
It is to emit several groups of best antenna subsets of x-th of constellation point performance.
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| CN201811029557.2A CN109120570B (en) | 2018-09-05 | 2018-09-05 | Antenna subset direction modulation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110233647A (en) * | 2019-06-24 | 2019-09-13 | 西北工业大学 | Modulate safety Enhancement Method in direction based on multi-antenna array |
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| CN104579440A (en) * | 2014-11-24 | 2015-04-29 | 南京邮电大学 | Directional modulation signal design method based on reverse antenna array. |
| CN108243627A (en) * | 2015-04-24 | 2018-07-03 | 云雀无线有限责任公司 | It is designed for the control channel of multiple antennas MU-MIMO system |
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| CN104579440A (en) * | 2014-11-24 | 2015-04-29 | 南京邮电大学 | Directional modulation signal design method based on reverse antenna array. |
| CN108243627A (en) * | 2015-04-24 | 2018-07-03 | 云雀无线有限责任公司 | It is designed for the control channel of multiple antennas MU-MIMO system |
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| HHUALI WANG: "EVM performance evaluation of array channels" amplitude and phase errors for DBF phased array antennas", 《IEEE》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110233647A (en) * | 2019-06-24 | 2019-09-13 | 西北工业大学 | Modulate safety Enhancement Method in direction based on multi-antenna array |
| CN110233647B (en) * | 2019-06-24 | 2021-07-16 | 西北工业大学 | Direction modulation security enhancement method based on multiple antenna arrays |
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