CN205725790U - The OOFDM encryption system mapped based on chaos sequence - Google Patents
The OOFDM encryption system mapped based on chaos sequence Download PDFInfo
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- CN205725790U CN205725790U CN201620213935.2U CN201620213935U CN205725790U CN 205725790 U CN205725790 U CN 205725790U CN 201620213935 U CN201620213935 U CN 201620213935U CN 205725790 U CN205725790 U CN 205725790U
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Abstract
The utility model discloses a kind of OOFDM encryption system mapped based on chaos sequence.This utility model includes light emission module based on chaos sequence mapping encrypting, optical fiber transmission module and maps the Optical Receivers of deciphering based on chaos sequence, and light emission module, optical fiber transmission module and Optical Receivers are sequentially connected with.Light emission module based on chaos sequence mapping encrypting includes chaos encryption unit and OFDM modulating unit；Wherein chaos encryption unit is connected with optical fiber transmission module one end by OFDM modulating unit；The Optical Receivers mapping deciphering based on chaos sequence includes chaos decryption unit and OFDM demodulation unit；The optical fiber transmission module other end is connected with chaos decryption unit by OFDM demodulation unit.Invention makes full use of the chaos system feature to initial value sensitivity, greatly improves the safety of encryption, the most preferably keeps the orthogonality of OFDM modulation simultaneously, reduces the damage of the systematic function brought because of encryption.
Description
Technical field
This utility model relates to optic communication encryption technology field, is specifically related to a kind of based on chaos
The OOFDM encryption system of sequence mapping.
Background technology
Along with development and the maturation of communication technology, people are to the requirement of traffic rate increasingly
High.Along with the application of the forth generation mobile communication based on data communication and Image Communication, optical fiber
Communication becomes the major way of mobile communication.Light OFDM (Optical
Orthogonal Frequency Division Multiplexing, OOFDM) technology conduct
A kind of optical communication technique that can be effective against signal waveform interference, causes and pays close attention to widely.
Meanwhile, the data encryption for OOFDM system is had in also becoming the application of OOFDM system
The problem solved.
In recent years, chaos encryption has obtained paying close attention to the most widely.Owing to chaotic signal has
Stochastic behaviour, the wide power spectral density noise-like to the sensitive dependence of initial condition and class, make
Obtain chaotic signal to be difficult to be decrypted；Additionally, utilize chaos circuit to realize secret communication, available letter
The frequency spectrum of signal is also made to be able to extension etc. while the encryption function that single circuit realiration is basic.
These characteristics of chaos sequence make chaos encryption status in field of information encryption increasingly
Important.
Finding through retrieval, Xioanan Hu et al. is at IEEE photon technology bulletin (Photonics
Technology Letters) delivered on magazine entitled " Chaos-Based Partial
Transmit Sequence Technique for Physical Layer Security in
OFDM-PON " article.In this paper, author uses the chaos system of the four-dimension, with chaos
The initial value of system, as key, produces chaos sequence and controls orthogonal amplitude in OFDM modulation
The phase factor of modulation (QAM), it is achieved that the encryption to OFDM transmission system physical layer.But,
The phase factor that the program uses four-dimensional chaos system to map QAM is encrypted, four-dimensional mixed
Ignorant sequence use the complexity on the one hand adding system, on the other hand QAM mapped phases because of
The change of son also can destroy the orthogonality of ofdm signal to a certain extent, thus necessarily
The reduction of systematic function, the increase of furnishing cost and the fall of system effectiveness will be caused in degree
Low.
Summary of the invention
The purpose of this utility model is for the deficiencies in the prior art, it is provided that a kind of based on chaos sequence
The OOFDM encryption system that row map.
It is specific as follows that this utility model solves the technical scheme that its technical problem used:
This utility model includes light emission module based on chaos sequence mapping encrypting, fiber-optic transfer
Module and Optical Receivers based on chaos sequence mapping deciphering, it is characterised in that light emission mould
Block, optical fiber transmission module and Optical Receivers are sequentially connected with；
Described light emission module based on chaos sequence mapping encrypting include chaos encryption unit and
OFDM modulating unit；Wherein chaos encryption unit is by OFDM modulating unit and fiber-optic transfer mould
Block one end is connected；
Described based on chaos sequence map deciphering Optical Receivers include chaos decryption unit and
OFDM demodulation unit；The optical fiber transmission module other end is deciphered with chaos by OFDM demodulation unit
Unit is connected；
The ciphering process of described chaos encryption unit is specific as follows:
First determine the encryption key value of encryption key, then encryption key value is inputted chaos letter
Number generator produces chaotic signal sequence flows；Chaotic signal sequence flows produces through two-value maker
Binary sequence；Binary sequence and raw data signal stream are carried out chaos encryption, after encryption
Generate after carrying out QAM mapping and map data stream, map data stream and sequentially pass through OFDM modulation list
The data stream do not deciphered after generating demodulation after unit, optical fiber transmission module and OFDM demodulation unit；
The encryption of described binary sequence and raw data signal stream uses XOR encryption method；
The decrypting process of described chaos decryption unit is specific as follows:
The described chaos decryption unit mapped based on OFDM QAM includes encrypting key, then will
Encryption key value input chaos signal generator produces chaotic signal sequence flows；Chaotic signal sequence
Flow and produce deciphering binary sequence through two-value maker；The data diffluence do not deciphered after demodulation is reflected
Penetrate the data stream do not deciphered after taking mapping；Do not decipher after deciphering binary sequence and demapping
Data stream carry out XOR, thus recover raw data signal stream.
Described optical fiber transmission module includes laser instrument, photomodulator, optical fiber and photodetector；
And laser instrument, photomodulator, optical fiber and photodetector are sequentially connected with；Laser launched by laser instrument
To photomodulator, the data stream that OFDM modulating unit transmits is modulated laser instrument by photomodulator
On the light carrier produced, then it is transmitted through the fiber to photodetector.
Described OFDM modulating unit data stream after modulating the encryption of chaos encryption unit, tool
Body include that QAM maps, the insertion of pilot tone, IFFT convert, add Cyclic Prefix, P/S and
D/A changes.
Described OFDM demodulation unit, has through the data stream of photodetector transmission for demodulation
Body include that S/P and A/D changes, remove Cyclic Prefix, FFT, pilot channel estimation,
Channel equalization and demapping.
Chaos signal generator refers to the chaos system determined, including Logistic chaos system,
Henon chaos system and Lorenz chaos system etc., wherein chaos signal generator is preferred
Logistic chaos system, concrete:
The iteration form of Logistic chaos system is expressed as follows
xn+1=f (xn)=μ * xn*(1-xn)
Wherein x0∈ (0,1), systematic parameter, μ ∈ [0,4], when 3.5699≤μ≤4, this Logistic
Chaos system is in stable chaos state；3.5699≤μ≤4 are referred to as what Logistic mapped
Chaotic region, the chaos sequence now produced is defined on interval (0,1).
Preferably, the laser instrument in optical fiber transmission module is used for producing light carrier.
Preferably, the chaos system that chaos signal generator uses can be one-dimensional, it is also possible to
It is multidimensional, this utility model uses one-dimensional logistic map, at satisfied encryption need
System effectiveness can be improved again while asking.
Preferably, the two-value maker in chaos encryption unit based on OFDM QAM mapping is used
After the chaos sequence of generation is converted into 0 or 1 the two value, and primary signal interaction
Produce coded signal.
Preferably, the QAM of OFDM modulating unit maps and 16QAM can be used to modulate, can be 4,
16,64 etc. are not limited to this value, can be arbitrary high-order modulating.
Preferably, the insertion pilot tone of OFDM modulating unit is used for carrying out channel estimation.
OFDM modulating unit preferably adds Cyclic Prefix be used for overcoming carrier wave multipath to produce
The impact of dispersion.
Preferably, photodetector is used for receiving the optical signal in fiber-optic transfer channel.
Compared with prior art, this utility model has the advantage that
1) this encipherment scheme is simple, be easily achieved, it is only necessary to before the mapping of ofdm signal in addition
Operation, may preferably use two-forty, high capacity transmission OOFDM system in；
2) due to the initial value sensitivity of chaos system, it is ensured that the infinity of key capacity, this
Patent can greatly reduce and add the possibility that confidential information is cracked；
3) this encipherment scheme uses xor operation and Chaotic Sequence Code dual encryption scheme, can be
The safety of system is improved on certain procedures.
4) this encipherment scheme only need to operate at numeric field, and hardware aspect is easily operated, thus in fact
Now simple, workable.
In sum, it is good that the purpose of this utility model is to provide a kind of safety, and system effectiveness is high
Based on chaos sequence map OOFDM encryption system.
Accompanying drawing explanation
The detailed description with reference to the following drawings, non-limiting example made by reading, this
The other features, objects and advantages of utility model will become more apparent upon:
Fig. 1 is the OOFDM Communication System Flow schematic diagram mapped based on chaos sequence；
Fig. 2 is the chaos encryption cell schematics mapped based on OFDM QAM；
Fig. 3 (a) and 3 (b) are that effect is shown after the QAM mapping encrypting to OFDM modulating unit
It is intended to；
Fig. 4 is the chaos deciphering cell schematics mapped based on OFDM QAM；
Detailed description of the invention
Below in conjunction with specific embodiment, this utility model is described in detail.Following example will
Contribute to those skilled in the art and be further appreciated by this utility model, but limit the most in any form
This utility model processed.It should be pointed out that, to those skilled in the art, not
On the premise of departing from this utility model design, it is also possible to make some deformation and improvement.These are all
Belong to protection domain of the present utility model.
This utility model makes full use of the initial value sensitivity of chaos sequence and the spy of unpredictability
The xor operation that point and high-speed figure process, it is achieved that the double-encryption of signal, can be necessarily
Improve the safety of OOFDM system encryption in degree, reduce the risk of information leakage；Additionally,
Being encrypted the QAM demapping section of OOFDM, algorithm is simple, and hardware aspect is easily achieved.
As it is shown in figure 1, this utility model includes light emission mould based on chaos sequence mapping encrypting
Block, optical fiber transmission module and Optical Receivers based on chaos sequence mapping deciphering, its feature exists
It is sequentially connected with in light emission module, optical fiber transmission module and Optical Receivers；
Described light emission module based on chaos sequence mapping encrypting include chaos encryption unit and
OFDM modulating unit；Wherein chaos encryption unit is by OFDM modulating unit and fiber-optic transfer mould
Block one end is connected；
Described based on chaos sequence map deciphering Optical Receivers include chaos decryption unit and
OFDM demodulation unit；The optical fiber transmission module other end is deciphered with chaos by OFDM demodulation unit
Unit is connected；
As in figure 2 it is shown, the ciphering process of chaos encryption unit is specific as follows:
First determine the encryption key value of encryption key, then encryption key value is inputted chaos letter
Number generator produces chaotic signal sequence flows；Chaotic signal sequence flows produces through two-value maker
Binary sequence；Binary sequence and raw data signal stream are carried out chaos encryption, after encryption
Generate after carrying out QAM mapping and map data stream, map data stream and sequentially pass through OFDM modulation list
The data stream do not deciphered after generating demodulation after unit, optical fiber transmission module and OFDM demodulation unit；
In this utility model, chaos signal generator uses one-dimensional Logistic to map, and encrypts key
For the initial value of Logistic, the fine difference of initial value can cause the huge difference of chaos system
Different, thus ensure that encryption key can not exhaustive row.Logistic chaos system produces 0
Chaos sequence between 1, generates 0,1 sequence flows after described two-value maker；QAM
Mapping encrypting part is mainly made up of AES and mapping.Concrete AES can have many
Kind, this utility model uses XOR algorithm, will primary signal and after two-value maker
The 0,1 data stream produced carries out XOR.Thus to primary signal through row encryption.
Chaos signal generator refers to the chaos system determined, including Logistic chaos system,
Henon chaos system and Lorenz chaos system, wherein chaos signal generator is preferred
Logistic chaos system, concrete:
The iteration form of Logistic chaos system is expressed as follows
xn+1=f (xn)=μ * xn*(1-xn)
Wherein x0∈ (0,1), systematic parameter, μ ∈ [0,4], when 3.5699≤μ≤4, this Logistic
Chaos system is in stable chaos state；3.5699≤μ≤4 are referred to as what Logistic mapped
Chaotic region, the chaos sequence now produced is defined on interval (0,1).
The encryption of described binary sequence and raw data signal stream uses XOR encryption method；
The decrypting process of chaos decryption unit is specific as follows:
The described chaos decryption unit mapped based on OFDM QAM includes encrypting key, then will
Encryption key value input chaos signal generator produces chaotic signal sequence flows；Chaotic signal sequence
Flow and produce deciphering binary sequence through two-value maker；The data diffluence do not deciphered after demodulation is reflected
Penetrate the data stream do not deciphered after taking mapping；Do not decipher after deciphering binary sequence and demapping
Data stream carry out XOR, thus recover raw data signal stream.
Described optical fiber transmission module includes laser instrument, photomodulator, optical fiber and photodetector；
And laser instrument, photomodulator, optical fiber and photodetector are sequentially connected with；Laser launched by laser instrument
To photomodulator, the data stream that OFDM modulating unit transmits is modulated laser instrument by photomodulator
On the light carrier produced, then it is transmitted through the fiber to photodetector.
As shown in Fig. 3 (a) and 3 (b), described OFDM modulating unit is used for modulating chaos
Data stream after ciphering unit encryption, concrete includes that QAM maps, the insertion of pilot tone, IFFT
Conversion, adds Cyclic Prefix, P/S and D/A changes.And the QAM of OFDM modulating unit reflects
The phase place that initial data maps will be changed so that the rule that do not has that phase place becomes can after penetrating encryption
Follow, thus enhance the safety of information.Effect is as shown in Figure 3.
Described OFDM demodulation unit, has through the data stream of photodetector transmission for demodulation
Body include that S/P and A/D changes, remove Cyclic Prefix, FFT, pilot channel estimation,
Channel equalization and demapping.
Further, chaos sequence decryption unit and ciphering unit Datong District of mapping based on QAM are little
Different, as shown in Figure 4.Specifically include chaos sequence generating portion and QAM maps decryption portion.
Chaos sequence generating portion specific works flow process sees above, and is not repeated herein.Should be noted that
Be encryption key and the chaos system that used must and chaos sequence based on QAM mapping add
Close cell mesh identical.QAM maps decryption portion will be through photoelectric detector and OFDM
The signal obtained after demodulating unit and the chaos sequence 0,1 of generation flow and again carry out XOR process
Just primary signal can be recovered.
Claims (6)
1. the OOFDM encryption system mapped based on chaos sequence, reflects including based on chaos sequence
Penetrate the light emission module of encryption, optical fiber transmission module and light based on chaos sequence mapping deciphering to connect
Receive module, it is characterised in that light emission module, optical fiber transmission module and Optical Receivers connect successively
Connect；
Described light emission module based on chaos sequence mapping encrypting include chaos encryption unit and
OFDM modulating unit；Wherein chaos encryption unit is by OFDM modulating unit and fiber-optic transfer mould
Block one end is connected；
Described based on chaos sequence map deciphering Optical Receivers include chaos decryption unit and
OFDM demodulation unit；The optical fiber transmission module other end is deciphered with chaos by OFDM demodulation unit
Unit is connected；
The ciphering process of described chaos encryption unit is specific as follows:
First determine the encryption key value of encryption key, then encryption key value is inputted chaos letter
Number generator produces chaotic signal sequence flows；Chaotic signal sequence flows produces through two-value maker
Binary sequence；Binary sequence and raw data signal stream are carried out chaos encryption, after encryption
Generate after carrying out QAM mapping and map data stream, map data stream and sequentially pass through OFDM modulation list
The data stream do not deciphered after generating demodulation after unit, optical fiber transmission module and OFDM demodulation unit；
The encryption of described binary sequence and raw data signal stream uses XOR encryption method；
The decrypting process of described chaos decryption unit is specific as follows:
The described chaos decryption unit mapped based on OFDM QAM includes encrypting key, then will
Encryption key value input chaos signal generator produces chaotic signal sequence flows；Chaotic signal sequence
Flow and produce deciphering binary sequence through two-value maker；The data diffluence do not deciphered after demodulation is reflected
Penetrate the data stream do not deciphered after taking mapping；Do not decipher after deciphering binary sequence and demapping
Data stream carry out XOR, thus recover raw data signal stream.
The OOFDM encryption system mapped based on chaos sequence the most according to claim 1,
It is characterized in that optical fiber transmission module includes laser instrument, photomodulator, optical fiber and photodetector；
And laser instrument, photomodulator, optical fiber and photodetector are sequentially connected with；Laser launched by laser instrument
To photomodulator, the data stream that OFDM modulating unit transmits is modulated laser instrument by photomodulator
On the light carrier produced, then it is transmitted through the fiber to photodetector.
The OOFDM encryption system mapped based on chaos sequence the most according to claim 2,
It is characterized in that described OFDM modulating unit data after modulating the encryption of chaos encryption unit
Stream.
The OOFDM encryption system mapped based on chaos sequence the most according to claim 2,
It is characterized in that described OFDM demodulation unit is for demodulating the data through photodetector transmission
Stream.
5., according to the OOFDM encryption system mapped based on chaos sequence described in right 2, it is special
Levy and be that chaos signal generator refers to the chaos system determined, including Logistic chaos system,
Henon chaos system and Lorenz chaos system.
6. according to the OOFDM encryption system mapped based on chaos sequence described in right 5, its
It is characterised by that chaos signal generator refers to Logistic chaos system, concrete:
The iteration form of Logistic chaos system is expressed as follows
xn+1=f (xn)=μ * xn*(1-xn)
Wherein x0∈ (0,1), systematic parameter, μ ∈ [0,4], when 3.5699≤μ≤4, this Logistic
Chaos system is in stable chaos state；3.5699≤μ≤4 are referred to as what Logistic mapped
Chaotic region, the chaos sequence now produced is defined on interval (0,1).
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600661A (en) * | 2020-05-14 | 2020-08-28 | 浙江大学 | Three-dimensional encryption OFDM optical system based on real-time updated chaotic key distribution |
| CN112187367A (en) * | 2020-09-22 | 2021-01-05 | 武汉光迅科技股份有限公司 | Optical transceiver and optical transceiver equipment |
| CN112911423A (en) * | 2020-12-24 | 2021-06-04 | 南京信息工程大学 | Safe optical interconnection system and method based on three-dimensional disturbance and elastic optical network |
-
2016
- 2016-03-18 CN CN201620213935.2U patent/CN205725790U/en not_active Expired - Fee Related
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111600661A (en) * | 2020-05-14 | 2020-08-28 | 浙江大学 | Three-dimensional encryption OFDM optical system based on real-time updated chaotic key distribution |
| CN112187367A (en) * | 2020-09-22 | 2021-01-05 | 武汉光迅科技股份有限公司 | Optical transceiver and optical transceiver equipment |
| CN112187367B (en) * | 2020-09-22 | 2022-03-08 | 武汉光迅科技股份有限公司 | Optical transceiver and optical transceiver equipment |
| CN112911423A (en) * | 2020-12-24 | 2021-06-04 | 南京信息工程大学 | Safe optical interconnection system and method based on three-dimensional disturbance and elastic optical network |
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| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20161123 Termination date: 20190318 |