CN206135928U - Cognitive radio system based on frequency domain is chaos - Google Patents
Cognitive radio system based on frequency domain is chaos Download PDFInfo
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- CN206135928U CN206135928U CN201621165462.XU CN201621165462U CN206135928U CN 206135928 U CN206135928 U CN 206135928U CN 201621165462 U CN201621165462 U CN 201621165462U CN 206135928 U CN206135928 U CN 206135928U
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Abstract
The utility model provides a cognitive radio system based on frequency domain is chaos, this system combines cognitive radio and chaos modulation, applies to wireless communication system, and the empty frequency spectrum that has utilized cognitive radio promptly detects the spectrum utilization efficiency that improves communication system with access capability, uses the signal modulation of frequency domain with chaos signal again, has improved the information security who communicates by letter. Wherein, the OFDM modulation technique that adopts in the signal modulation of frequency domain is prior art, the utility model discloses a combine chaos signal of frequency domain and OFDM modulation technique, use in the cognitive radio system to realize effectual frequency domain cognition and secure communication.
Description
Technical field
This utility model is related to wireless communication field, more particularly, to a kind of cognitive radio based on frequency domain chaos
System.
Background technology
With the continuous development of Internet of Things, it is wirelessly transferred with regard to the high speed high security of Item Information in Intelligent logistics
Jing becomes a kind of demand.But on the one hand, the communication performance of Internet of Things is limited to frequency spectrum resource in short supply, thus, it is possible to detect spectrum
Cavity, the cognitive radio technology for identifying unused frequency range so as to improve the availability of frequency spectrum have been obtained in recent years widely
Using.On the other hand, chaotic signal modulation technique is enhancing physical layer information transmission safety in legacy wireless communication system
Effective ways, and the cognitive radio system in Internet of Things is as legacy wireless communication system, it is wireless due to transmission information
Channel has broadcast characteristic, easily by malicious attack.Therefore, chaos technology is used for into cognitive radio system, so as to ensure
The safety of Item Information in Internet of Things, has good application prospect in the Internet of Things communications field.
However, traditional chaotic communication system is based on signal procesing in time domain technology, its chaos signal generator is also work
Make in time domain, therefore, as other communication systems, need the frequency band for occupying a continuous fixation to carry out transmission information.This makes
Obtain traditional chaotic communication technology to be difficult in the cognitive radio system for being directly used in dynamic spectrum access.
Utility model content
This utility model provides a kind of cognitive radio system based on frequency domain chaos, and the system possesses cognitive radio
Empty frequency spectrum detection and access capability, are provided simultaneously with the high safety performance of chaotic communication.
In order to reach above-mentioned technique effect, the technical solution of the utility model is as follows：
A kind of cognitive radio system based on frequency domain chaos, including transmitting terminal and receiving terminal, transmitting terminal and receiving terminal lead to
Cross channel connection, transmitting terminal include symbol-modulated module, chaotic modulation module, frequency spectrum AM access module, OFDM modulation modules and on
Frequency-variable module, receiving terminal includes symbol demodulation module, chaos demodulation module, frequency spectrum AM access module, OFDM demodulation module, synchronous mould
Block and down conversion module；The symbol-modulated module, chaotic modulation module, frequency spectrum AM access module OFDM modulation modules and up-conversion
Module is sequentially connected with；The up-converter module channel is connected with down conversion module, and the synchronized module of down conversion module is connected to
OFDM demodulation module connects, and OFDM demodulation module is also connected through frequency spectrum AM access module with chaos demodulation module, Chaotic Solution mode transfer
Block is also connected with symbol demodulation module；Bit stream is exported from symbol-modulated module input system from symbol demodulation module.
In this utility model, the symbol Jing frequency spectrums AM access module modulated by OFDM modulation modules is taken out on usable spectrum
After information symbol, chaos demodulation module is input to recover high-order symbol, these symbols recently enter symbol demodulation
Module is restoring bit stream；Wherein, in chaotic modulation module chaos signal generator produce chaotic signal and via symbol
The symbol that modulation module is mapped to together is input to chaotic mask module, and here takes the polarity and information symbol of chaotic signal
Point multiplication operation is carried out so that the polarity of symbol is presented pseudorandom permutation to improve Information Security.
Further, the symbol-modulated module includes serioparallel exchange module and the symbol mapping block being sequentially connected with, string
And the external bit signal source of modular converter, symbol mapping block is also connected with chaotic modulation module.
Further, the chaotic modulation module includes transmitting terminal chaos signal generator and chaotic mask module, chaos
An input for covering module is connected with symbol mapping block, another input and transmitting terminal chaos signal generator phase
Even.
Further, the frequency spectrum AM access module includes cognitive radio frequency spectrum sensing module, transmitting terminal subcarrier maps
Module and receiving terminal sub-carrier mapping module；One input of transmitting terminal sub-carrier mapping module is defeated with chaotic mask module
Go out end connection, another input is connected with cognitive radio frequency spectrum sensing module；One of receiving terminal sub-carrier mapping module
Input is connected with OFDM demodulation module, and another input is connected with cognitive radio frequency spectrum sensing module.
Further, the OFDM modulation modules include inverse fast fourier transform module, the parallel-serial conversion being sequentially connected with
Module and synchronizing signal add module；The input of inverse fast fourier transform module is defeated with transmitting terminal sub-carrier mapping module
Go out end connection, synchronizing signal adds module to be connected to up-converter module.
Further, the OFDM demodulation module includes that the synchronizing signal being sequentially connected with removes module, serioparallel exchange module
And fast Fourier transform module；Synchronizing signal removes the input of module and is connected with synchronization module, fast Fourier transform mould
Block is connected to an input of receiving terminal sub-carrier mapping module.
Further, the chaos demodulation module includes that receiving terminal chaos signal generator and chaos go to cover module；It is mixed
The outfan of the ignorant input and receiving terminal sub-carrier mapping module for going to cover module, another input is believed with chaos
The connection of number generator.
Further, the symbol demodulation module includes symbol judgement module and the parallel serial conversion module being sequentially connected with, symbol
The input of number judging module goes the outfan for covering module to be connected with chaos, parallel serial conversion module output process after bit stream
Signal.
Compared with prior art, the beneficial effect of technical solutions of the utility model is：
This utility model combines cognitive radio with chaotic modulation, in applying to wireless communication system, that is, utilizes
The empty frequency spectrum detection and access capability of cognitive radio improve the spectrum utilization efficiency of communication system, and should by chaotic signal
In using the signal modulation of frequency domain, the Information Security of communication is improve.Wherein, the OFDM for adopting in the signal modulation of frequency domain is adjusted
Technology processed is prior art, of the present utility model it is important that frequency domain chaotic signal is combined with OFDM modulation techniques,
In being applied to cognitive radio system, so as to realize effective frequency domain cognition and secure communication.
Description of the drawings
Fig. 1 is this utility model system construction drawing；
Fig. 2 is synchronization program flow process of the system based on OFDM.
Specific embodiment
Accompanying drawing being for illustration only property explanation, it is impossible to be interpreted as the restriction to this patent；
In order to more preferably illustrate the present embodiment, accompanying drawing some parts have omission, zoom in or out, and do not represent actual product
Size；
To those skilled in the art, it can be to understand that some known features and its explanation may be omitted in accompanying drawing
's.
The technical solution of the utility model is described further with reference to the accompanying drawings and examples.
Embodiment 1
As shown in figure 1, a kind of cognitive radio system based on frequency domain chaos, including transmitting terminal and receiving terminal, transmitting terminal
Connected by channel with receiving terminal, transmitting terminal includes that symbol-modulated module, chaotic modulation module, frequency spectrum AM access module, OFDM are adjusted
Molding block and up-converter module, receiving terminal includes symbol demodulation module, chaos demodulation module, frequency spectrum AM access module, OFDM demodulation
Module, synchronization module and down conversion module；The symbol-modulated module, chaotic modulation module, frequency spectrum AM access module OFDM modulation
Module and up-converter module are sequentially connected with；The up-converter module channel is connected with down conversion module, and down conversion module Jing is same
Step module is connected to the connection of OFDM demodulation module, and OFDM demodulation module also connects through frequency spectrum AM access module with chaos demodulation module
Connect, chaos demodulation module is also connected with symbol demodulation module；Bit stream from symbol-modulated module input system, from symbolic solution mode transfer
Block is exported.
In the present embodiment, the effect of serioparallel exchange in transmitting terminal, symbol-modulated module is by the message bit stream of serial
Parallel bit stream is converted into, the symbol mapping of high-order is carried out to it to be adapted to symbol-modulated module, parallel bit stream is entered
Symbol mapping block therein, through the mapping of the planispheres such as QAM, 16PSK symbol is changed into；In chaotic modulation module,
The chaotic signal produced by chaos signal generator and the symbol being mapped to together are input to chaotic mask module therein,
Calculation process is carried out to be encrypted to information symbol to information symbol and chaotic signal at this, the computing that this utility model is adopted
It is that the polarity for taking chaotic signal carries out dot product operation with information symbol, so that the polarity of symbol is presented pseudorandom permutation.Connecing
Receiving end, chaos demodulation module has identical chaos initial value and parameter with transmitting terminal, to through OFDM demodulation and subcarrier maps
Symbol and chaotic signal carry out inverse operation process with decryption information.Inverse operation and the computing of transmitting terminal that this utility model is adopted
Identical, that is, the polarity and symbol for taking chaotic signal carries out dot product operation, so that the polarity of symbol is recovered.
In the present embodiment, symbol-modulated module includes serioparallel exchange module and the symbol mapping block being sequentially connected with, and string is simultaneously
The external bit signal source of modular converter, symbol mapping block is also connected with chaotic modulation module；Chaotic modulation module includes sending
End chaos signal generator and chaotic mask module a, input of chaotic mask module is connected with symbol mapping block, separately
One input is connected with transmitting terminal chaos signal generator.
In the present embodiment, frequency spectrum AM access module includes cognitive radio frequency spectrum sensing module, transmitting terminal subcarrier maps mould
Block and receiving terminal sub-carrier mapping module；One input of transmitting terminal sub-carrier mapping module and the output of chaotic mask module
End connection, another input is connected with cognitive radio frequency spectrum sensing module；One of receiving terminal sub-carrier mapping module is defeated
Enter end to be connected with OFDM demodulation module, another input is connected with cognitive radio frequency spectrum sensing module.Frequency spectrum AM access module
Effect have at 2 points, one is the dynamically perceived spectral information from space, and two is to avoid this according to perceiving the spectrum information that obtains
When occupied frequency range and generate usable spectrum and use to sender and recipient；Wherein, frequency spectrum AM access module perceived spectral letter
The method of breath is：Information discrete symbols to receiving carry out FFT and obtain frequency-region signal, then take frequency-region signal square obtain energy
Spectrum signal, when the energy spectrum signal of primary user and the different energy spectrum signal of secondary user, can arrange certain energy spectrum thresholding
Primary user and time user are distinguished, to avoid the frequency range of primary user's occupancy and generate the frequency spectrum for being available for time user to use.Here, working as
The timing of points one of FFT, by this cross-talk frequency range multiple frequency sub-band are averagely divided into.The number of frequency sub-band is more, i.e. target frequency bands
The frequency sub-band number that identification can be refined is more, and the levels of precision requirement to spectrum cognitive is also higher；The precision of frequency spectrum detection with
FFT points are proportional, and increase FFT points can improve frequency spectrum detection precision, be beneficial to the detection of narrow band signal；Generate available frequency
The function of spectrum realizes that its effect is to determine the center frequency of target frequency bands by the sub-carrier mapping module inside frequency spectrum AM access module
Rate and bandwidth, and the usable spectrum information obtained according to perception in this section of target frequency bands carries out subcarrier maps.
OFDM modulation modules include inverse fast fourier transform module, parallel serial conversion module and the synchronizing signal being sequentially connected with
Add module；The input of inverse fast fourier transform module is connected with the outfan of transmitting terminal sub-carrier mapping module, synchronous
Signal adds module to be connected to up-converter module；OFDM demodulation module includes that the synchronizing signal being sequentially connected with removes module, string simultaneously
Modular converter and fast Fourier transform module；Synchronizing signal removes the input of module and is connected with synchronization module, in quick Fu
Leaf transformation module is connected to an input of receiving terminal sub-carrier mapping module.
Wherein, chaos demodulation module includes that receiving terminal chaos signal generator and chaos go to cover module；Chaos goes to cover
One input of module and the outfan of receiving terminal sub-carrier mapping module, another input and chaos signal generator
Connection；Demodulation module includes the symbol judgement module that is sequentially connected with and parallel serial conversion module, the input of symbol judgement module with
Chaos removes the outfan connection for covering module, the Bitstream signal after parallel serial conversion module output process.
In the present embodiment, using the general software radio peripheral hardware (USRP) of U.S. National Instruments and soft
Part development platform LabVIEW, Up/Down Conversion transfers to USRP to realize, the realization of the modulation and demodulation function on sign synchronization and upper strata is then
Realized by software view.Wherein, synchronization module is to the sign synchronization of baseband signal on software, and its program circuit is as shown in Figure 2.
Its method is, based on the synchronized algorithm of training sequence, to send and receive both sides and share training sequence known to a section, and receiving terminal is every
The secondary data for taking two groups of OFDM symbol length, with least one group training sequence in this two groups of data when guaranteeing that signal is synchronous,
Receiving terminal, carries out related operation, by arranging certain dependent threshold, if correlation is big with the docking collection of letters number of local training sequence
In the thresholding, training sequence position is as have found.When the original position that have found every group of OFDM symbol training sequence, that is, realize
Sign synchronization.
The corresponding same or analogous part of same or analogous label；
Position relationship for the explanation of being for illustration only property described in accompanying drawing, it is impossible to be interpreted as the restriction to this patent；
Obviously, above-described embodiment of the present utility model is only intended to clearly illustrate this utility model example, and
It is not the restriction to embodiment of the present utility model.For those of ordinary skill in the field, in described above
On the basis of can also make other changes in different forms.There is no need to give all of embodiment
It is exhaustive.All any modification, equivalent and improvement made within spirit of the present utility model and principle etc., should be included in
Within this utility model scope of the claims.
Claims (8)
1. a kind of cognitive radio system based on frequency domain chaos, including transmitting terminal and receiving terminal, transmitting terminal and receiving terminal pass through
Channel connects, it is characterised in that transmitting terminal includes symbol-modulated module, chaotic modulation module, frequency spectrum AM access module, OFDM modulation
Module and up-converter module, receiving terminal includes symbol demodulation module, chaos demodulation module, frequency spectrum AM access module, OFDM demodulation mould
Block, synchronization module and down conversion module；The symbol-modulated module, chaotic modulation module, frequency spectrum AM access module OFDM modulation moulds
Block and up-converter module are sequentially connected with；The up-converter module channel is connected with down conversion module, and down conversion module is synchronized
Module is connected to the connection of OFDM demodulation module, and OFDM demodulation module is also connected through frequency spectrum AM access module with chaos demodulation module,
Chaos demodulation module is also connected with symbol demodulation module；Bit stream from symbol-modulated module input system, from symbol demodulation module
Output.
2. the cognitive radio system based on frequency domain chaos according to claim 1, it is characterised in that the symbol-modulated
Module includes serioparallel exchange module and the symbol mapping block being sequentially connected with, the external bit signal source of serioparallel exchange module, symbol
Mapping block is also connected with chaotic modulation module.
3. the cognitive radio system based on frequency domain chaos according to claim 2, it is characterised in that the chaotic modulation
Module includes transmitting terminal chaos signal generator and chaotic mask module, and an input and the symbol of chaotic mask module map
Module connects, and another input is connected with transmitting terminal chaos signal generator.
4. the cognitive radio system based on frequency domain chaos according to claim 3, it is characterised in that the frequency spectrum is accessed
Module includes cognitive radio frequency spectrum sensing module, transmitting terminal sub-carrier mapping module and receiving terminal sub-carrier mapping module；Send out
One input of sending end sub-carrier mapping module is connected with the outfan of chaotic mask module, another input and cognitive nothing
Line electricity frequency spectrum sensing module connection；One input of receiving terminal sub-carrier mapping module is connected with OFDM demodulation module, another
Individual input is connected with cognitive radio frequency spectrum sensing module.
5. the cognitive radio system based on frequency domain chaos according to claim 4, it is characterised in that the OFDM modulation
Module includes that the inverse fast fourier transform module, parallel serial conversion module and the synchronizing signal that are sequentially connected with add module；It is inverse quick
The input of Fourier transformation module is connected with the outfan of transmitting terminal sub-carrier mapping module, and synchronizing signal adds module connection
To up-converter module.
6. the cognitive radio system based on frequency domain chaos according to claim 5, it is characterised in that the OFDM demodulation
Module includes that the synchronizing signal being sequentially connected with removes module, serioparallel exchange module and fast Fourier transform module；Synchronizing signal
The input for removing module is connected with synchronization module, and fast Fourier transform module is connected to receiving terminal sub-carrier mapping module
One input.
7. the cognitive radio system based on frequency domain chaos according to claim 6, it is characterised in that the chaos demodulation
Module includes that receiving terminal chaos signal generator and chaos go to cover module；Chaos goes to cover an input of module and receive
The outfan of end sub-carrier mapping module, another input is connected with chaos signal generator.
8. the cognitive radio system based on frequency domain chaos according to claim 7, it is characterised in that the symbol demodulation
Module includes symbol judgement module and the parallel serial conversion module being sequentially connected with, and input and the chaos of symbol judgement module go to cover
The outfan connection of module, the Bitstream signal after parallel serial conversion module output process.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201621165462.XU CN206135928U (en) | 2016-10-25 | 2016-10-25 | Cognitive radio system based on frequency domain is chaos |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621165462.XU CN206135928U (en) | 2016-10-25 | 2016-10-25 | Cognitive radio system based on frequency domain is chaos |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183786A (en) * | 2018-03-16 | 2018-06-19 | 南京信息工程大学 | Based on the encrypted N-continuous orthogonal frequency division multiplexing methods of chaotic maps |
| CN110290083A (en) * | 2019-07-03 | 2019-09-27 | 中山大学 | Multicarrier difference chaotic Demodulation Systems method based on low-rank matrix estimation |
-
2016
- 2016-10-25 CN CN201621165462.XU patent/CN206135928U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108183786A (en) * | 2018-03-16 | 2018-06-19 | 南京信息工程大学 | Based on the encrypted N-continuous orthogonal frequency division multiplexing methods of chaotic maps |
| CN110290083A (en) * | 2019-07-03 | 2019-09-27 | 中山大学 | Multicarrier difference chaotic Demodulation Systems method based on low-rank matrix estimation |
| CN110290083B (en) * | 2019-07-03 | 2021-06-08 | 中山大学 | Multi-carrier differential chaotic system demodulation method based on low-rank matrix estimation |
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Granted publication date: 20170426 Termination date: 20171025 |