CN107872412A - A kind of energy-efficient difference chaotic communication system - Google Patents
A kind of energy-efficient difference chaotic communication system Download PDFInfo
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- CN107872412A CN107872412A CN201610854159.9A CN201610854159A CN107872412A CN 107872412 A CN107872412 A CN 107872412A CN 201610854159 A CN201610854159 A CN 201610854159A CN 107872412 A CN107872412 A CN 107872412A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/001—Modulated-carrier systems using chaotic signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/26—Systems using multi-frequency codes
- H04L27/2601—Multicarrier modulation systems
- H04L27/2602—Signal structure
- H04L27/261—Details of reference signals
- H04L27/2613—Structure of the reference signals
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/003—Arrangements for allocating sub-channels of the transmission path
- H04L5/0048—Allocation of pilot signals, i.e. of signals known to the receiver
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- Signal Processing (AREA)
- Computer Networks & Wireless Communication (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
A kind of energy-efficient difference chaotic communication plan is claimed in the present invention, and this programme belongs to field of wireless communications.By effectively being improved to the original frame structure of DCSK systems, the transmission time of each frame is shortened.Improved DCSK systems still keep original frame structure, it is changed into original 1/P (P=β/R) with reference to slot length, data slot length is constant, be it is by the reference time slot with reference to time slot and former frame plus and and replicate P time, while carry 2bit information and form.Demodulating end uses non-coherent demodulation mode, in order to demodulate each bit information well, here using synchronised clock.The data slot of the reference time slot received corresponding thereto is done into correlation, demodulates transmission information finally by decision threshold, i.e. correlation is more than zero, "+1 " is judged to, conversely, being judged to " 1 ".This programme possesses higher transmission speed than DCSK, while consumes lower bit energy.Performance good SERT DCSK, makes it be had a wide range of applications in wireless communication field.
Description
Technical field
It is contemplated that a kind of energy-efficient difference chaotic communication plan (SERT-DCSK) of design, makes it original
Difference chaotic offset keying (DCSK), which is technically improved, makes its transmission rate increase significantly, and energy per bit is significantly
Reduce.
Background technology
19th century mid-term, chaos first enters into the visual field of scientist, nineteen ninety, and USN is found that Chaotic Synchronous shows
As chaos is entered in the research of digital communication since then.Chaos instead of original cosine and sine signal as chaotic digital communication
Carrier wave.Chaotic signal produces simply, while itself has good correlation and cross correlation.The good nature of chaos makes it
It is widely used in digital communication.
Applied at present in chaotic digital communication is at most the difference chaotic key proposed by Kolumban et al. in 1996
Control the CDSK systems of (differential chaos shift keying, DCSK) and Sushchik in 2000 et al. proposition.
DCSK has good noise robustness and a very strong anti-fading property, but due to DCSK systems be by reference signal sum it is believed that
Number simultaneous transmission, reference signal, which does not carry information, will but spend time of a time slot to transmit, and so reduce efficiency of transmission,
Consume bit energy simultaneously.CDSK is that reference signal and data-signal are added and be placed on to transmit in a time slot, eliminates biography
Send the trouble of reference signal.But CDSK makes its bit error rate be inferior to DCSK due to generating more interference continuous item.From DCSK,
CDSK is suggested till now, and numerous researchers is directed to DCSK, and CDSK proposes the evolutionary approach of many.
By above-mentioned elaboration, the present invention be directed to the advantage of CDSK transmission rates to be improved to DCSK, it is proposed that a kind of
New chaotic digital communication scheme --- energy-efficient difference chaotic communication system (SERT-DCSK).
The content of the invention
The present invention is directed to the problem of DCSK transmission rates are low, it is proposed that a kind of energy-efficient difference chaotic communication system
System.The transmission speed of this invention is more than twice of traditional DCSK, while bit energy also greatly reduces.
Implementing method for scheme proposed by the invention is：One section of generation is original slot length 1/P chaos
Sequence is as present reference sequences, while by this section of sequence replicating P times, and two segment datas is transmitted in this section of chaos sequence
On, such a data frame can transmit 2bit information.The data reference sequence of one of bit is the reference sequence of former frame
Row, be able to transmit in the data sequence of next frame by delay circuit, so greatly improve data efficiency of transmission and
Speed.In demodulation, first bit in a frame is, second bit related to data sequence by the reference sequences of this frame
It is that the reference sequences of previous frame are related to current data sequence by delay circuit.The data after correlation are averaging every time
It is more than zero by threshold judgement, i.e. correlation afterwards, "+1 " is judged to, conversely, being judged to " -1 ".
The present invention has carried out the research of its performance in additive white Gaussian noise channel (AWGN) and rayleigh fading channel respectively,
And influence of the different reference sequences length to systematic function is probed into.The error code derived finally by Gaussian approximation (GA)
Rate and Monte Carlo are contrasted, so as to the correctness of certification theory.
Brief description of the drawings
The frame structure of Fig. 1 SERT-DCSK systems of the present invention and traditional DCSK systems；
Fig. 2 SERT-DCSK system transmitters structure charts of the present invention；
Fig. 3 SERT-DCSK system receivers structure charts of the present invention；
In the BER curve of awgn channel during Fig. 4 β=100 of the present invention, P=2,4,10；
In the BER curve of awgn channel during Fig. 5 β=300 of the present invention, P=2,4,10；
In the BER curve of awgn channel during Fig. 6 β=500 of the present invention, P=2,4,10；
The BER curve changed during Fig. 7 P=2 of the present invention in awgn channel with R；
The present invention is in awgn channel and the BER curve of FM-DCSK contrasts during Fig. 8 β=100；
The present invention is in rayleigh fading channel and the BER curve of FM-DCSK contrasts during Fig. 9 β=100；
Embodiment
Below in conjunction with accompanying drawing and instantiation, the implementation to the present invention is further described.
Fig. 1 gives the frame structure of SERT-DCSK systems and traditional DCSK systems, wherein figure (a) is DCSK frame structures, figure
(b) it is SERT-DCSK frame structures.Figure (a) and figure (b) contrast can be seen that the time of one frame of SERT-DCSK systems compares DCSK
System it is short, this is due to become original 1/P with reference to the length of time slot, and data slot length keeps constant.The biography of data
Defeated speed improves, while saves bit energy.The transmission rate of SERT-DCSK systems is：DCSK systems
Transmission rate be：I.e. SERT-DCSK systems can represent than the percentage that DCSK system transfer rate improves
For：
It can be obtained by abbreviation：
The bit energy of SERT-DCSK systems can be：The bit of DCSK systems
Energy is：Eb,DCSK=2 β TcE[xk 2], SERT-DCSK systems can represent than the percentage that DCSK systematic bits energy reduces
For：
It can be obtained by abbreviation：
Fig. 2 gives SERT-DCSK system receiver structure charts, and it is RT that chaos generator, which produces a segment length,c, i.e. xk,i
=(x0,i,…,xR-1,i) reference sequences of the chaos sequence as a frame, then caused this section of chaos sequence is replicated P times,
And R is postponed by delayer, signal now is divided into two branch roads, and upper branch road is modulated data onto above, and lower branch road leads to again
Delayer delay (P+1) R is crossed, is then modulated at another circuit-switched data above, the chaotic signal at this moment modulated is upper one
The reference signal of individual frame, now the chaotic signal that two-way is modulated is existed two-way modulated signal adduction by an adder
Together as the data-signal of the frame, i.e. bixk-R,i+bi-1xk-(P+2)R,i.It is a switch on the right side of figure (2), switchs and beat
The above is exactly to send reference signal, and it is exactly below to transmit data-signal that switch, which is beaten,.By taking the i-th frame as an example, sending signal can be with table
It is shown as：
Figure (3) gives SERT-DCSK system receiver structure charts, demodulates using non-coherent demodulation, believes receiving
Number it is divided into two branch roads, upper branch road is delayed after R by delayer and carried out related calculation with the signal before delay by correlator, i.e.,Lower branch road as upper branch road principle, simply by delayer be delayed (P+2) R, now by prolonging
When device chaotic signal be former frame reference signal, be by the related operation of correlator
The signal r that receiver receivesk,iIt can be expressed as：
rk,i=sk,i+ξk,i (6)
Wherein, ξk,iIt is zero for average, variance N0/ 2 white Gaussian noise.
Correlator output can be expressed as afterwards eventually through substitution and abbreviation：
Correlated results is made decisions by formula (9) and formula (10), information bit b can be obtainedi,bi-1。
The bit error rate of the SERT-DCSK systems in Gaussian channel is derived using GA methods.Assuming that formula (7) and inner each of formula (8)
The all approximate Gaussian distributed of item, then the items in formula (7) are simply calculated：
E1[Zi]=PR (11)
E2[Zi]=E3[Zi]=E4[Zi]=E5[Zi]=E6[Zi]=0 (12)
var1[Zi]=0 (13)
var2[Zi]=PR (14)
By formula (11)-formula (16) ZiAverage and variance can be expressed as：
E[Zi]=PR (17)
Wherein, E [] represents mathematic expectaion computing, and var [] represents variance computing.
Chaos generator maps using normalized Logistic, that is, has E [xi]=0, E [xi 2]=1 and var
[xi 2]=0, the signal b of transmissioniIt is equiprobable transmission { -1 ,+1 }, while biAnd bi-1The probability for occurring judging by accident is equal, so
The BER formula of SERT-DCSK systems can be expressed as：
Wherein
Above description is SERT-DCSK systems in additive white Gaussian noise channel, it is assumed that SERT-DCSK systems are in Rayleigh
Situation analysis in fading channel is as follows：
The process for assuming first that decline is slow fading, then the instantaneous signal-to-noise ratio of signal can be expressed as：
Wherein α (t) Rayleigh distributedsThen α2Two frees degree of obedience
χ2Distribution.rbProbability density function be：
Wherein,
It can be expressed as in the BER formula of Rayleigh channel SERT-DCSK systems：
Fig. 4,5,6SERT-DCSK systems are under identical spreading factor, the simulation curve of different reference sequences length.
As can be seen from the figure theoretical value and experiment value coincide substantially, can prove the correctness of the derivation of equation.Sequence is referred in identical
It can be seen that spreading factor is bigger under row length, performance is poorer, that is to say, that transmission rate is faster while error performance is better.Figure
7 be that error performance reduces with the increase of signal to noise ratio under different reference sequences length.Fig. 8 is by SERT-DCSK systems
With FM-DCSK systems the bit error rate is contrasted under identical spreading factor, as can be seen from the figure SERT-DCSK systems
Performance is better than FM-DCSK.Fig. 9 is to contrast SERT-DCSK systems and DCSK systems under Rayleigh channel.
The present invention improves message transmission rate by shortening the method with reference to slot length, bit energy is reduced, in phase
Performance is more taller than FM-DCSK performance under same spreading factor, while is also better than DCSK in rayleigh fading channel performance.Reason
Relatively it is coincide by value and simulation value curve ratio, illustrates the correctness of theory deduction.The present invention is mixed as can be seen from the above description
There is good application prospect in terms of ignorant digital communication.
Claims (3)
1. a kind of energy-efficient difference chaotic communication plan, its step are, by entering to the original frame structure of DCSK systems
The effective transmission time for improving, shortening each frame of row.Improved DCSK systems still keep original frame structure, reference
Slot length is changed into original 1/P (P=β/R), and data slot length is constant, is by the reference time slot with reference to time slot and former frame
Plus and and replicate P time, while carry 2bit information form.Demodulating end uses non-coherent demodulation mode.The reference that will be received
The data slot of time slot corresponding thereto does correlation, demodulates transmission information finally by decision threshold, i.e. correlation is more than
Zero, "+1 " is judged to, conversely, being judged to " -1 ".
2. communication plan according to claim 1, it is characterised in that each frame of the program transmits 2bit user profile,
Shorten with reference to slot length, so greatly reduce the transmission rate that energy per bit improves data.
3. method of estimation according to claim 1, it is characterised in that receiving terminal demodulation uses irrelevant demodulation.This method
It can be achieved using simple delay circuit, method is simple, and hardware cost is low.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108400865A (en) * | 2018-05-31 | 2018-08-14 | 长安大学 | One kind being based on DCSK chaos encrypting methods |
| CN111817993A (en) * | 2020-06-09 | 2020-10-23 | 重庆邮电大学 | Improved short reference correlation delay shift keying communication scheme |
| CN114826848A (en) * | 2022-03-04 | 2022-07-29 | 重庆邮电大学 | Communication method of enhanced high-efficiency short-parameter DCSK chaotic communication system |
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| CN108400865A (en) * | 2018-05-31 | 2018-08-14 | 长安大学 | One kind being based on DCSK chaos encrypting methods |
| CN108400865B (en) * | 2018-05-31 | 2020-11-24 | 长安大学 | Chaotic encryption method based on DCSK |
| CN111817993A (en) * | 2020-06-09 | 2020-10-23 | 重庆邮电大学 | Improved short reference correlation delay shift keying communication scheme |
| CN114826848A (en) * | 2022-03-04 | 2022-07-29 | 重庆邮电大学 | Communication method of enhanced high-efficiency short-parameter DCSK chaotic communication system |
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