CN105187347B - Polynary orthogonal chaos shift keying modulation demodulation method - Google Patents
Polynary orthogonal chaos shift keying modulation demodulation method Download PDFInfo
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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
- H04L27/32—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
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Abstract
The invention discloses polynary chaos shift keying modulation demodulation method, this method is by carrying out chaotic signal Hilbert orthogonal transformations and orthogonal Walsh sequences weighting, multiple orthogonal chaotic carrier signals are constructed, then recycle the method for polynary orthogonal modulation to be modulated/demodulate.The invention eliminates the delay unit in existing binary system/multi-system DCSK receivers, reduce the delay unit in transmitter, the complexity of realization is reduced, substantially increases the Bit Transmission Rate of system, and largely improves the bit error code performance of system.
Description
Technical field
The present invention relates to a kind of polynary orthogonal chaos shift keying modulation demodulation method, belong to field of communication technology.
Technical background
At present, typical case of the chaology in secret communication and spread spectrum communication, its chaos digital modulation technique is not only
The low probability of intercept and mitigate the characteristics such as multipath effect that conventional spread spectrum communication system has can be retained, but also many other
Aspect shows unique advantage, including：The hardware cost of reduction system；Lift communications security；It is adapted in multi-user's ring
Different user is effectively distinguished in border；Improve performance of spread spectrum communication system etc..Therefore, chaos digital modulation technique has become non-thread
One of hot issue that sexology is paid close attention to and studied with Information Center educational circles.
But under actual channel condition, lack the reliable and effective method that Chaotic Synchronous is realized in receiving terminal at present.
Therefore, existing chaos digital modulation-demo-demodulation method is mostly based on transmission reference method, i.e., carrier signal and carries information
Signal is all sent to receiving terminal.Wherein, difference chaotic offset keying (Differential Chaos Shift Keying,
DCSK) modulation-demo-demodulation method can obtain preferable error performance, without completing channel estimation, under many practical applications
(i.e.：Including wireless personal local area network, wireless sensor network etc.) all show very strong competitiveness.But due to spending
The time of half and power send the reference signal without any information, the Bit Transmission Rate and band utilization of DCSK systems
Rate is all relatively low.For this reason, four phase chaos offset keyings (Quadrature Chaos Shift Keying, QCSK) use orthogonal 2
Road chaotic signal is modulated, and the Bit Transmission Rate that can be achieved to is doubled, but the bit error code performance of system is simultaneously
It is not improved.Further, since DCSK/QCSK transmission of reference signals and information signal within the different periods, to ensure two
Person is orthogonal, thus transmitting terminal and receiving terminal must all use delay unit.In ultra wideband transmissions, mould is integrated using existing process
Plan delay unit is hardly possible, and the delay unit that digital form is realized will then consume huge power.For the problem, code moves
Difference chaotic offset keying (Code-Shifted Differential Chaos Shift Keying, CS-DCSK) modulatedemodulate
Tune method distinguishes the reference signal and information signal of simultaneous transmission using 2 road Walsh sequences.Although CS-DCSK eliminates reception
The delay unit at end, but transmitting terminal introduces more delay units, the Bit Transmission Rate of system is still relatively low, and system
Error performance is not lifted but.And the present invention can solve the problems, such as above well.
The content of the invention
Present invention aims at for existing chaos digital modulation-demo-demodulation method Bit Transmission Rate it is relatively low the problem of, carry
Go out a kind of polynary orthogonal chaos shift keying modulation demodulation method, it is N β that the repetition chaos signal generator of this method, which produces length,
It is discrete repeat chaotic signal；Chaotic signal is repeated according to discrete, 2 road orthogonal basis functions are generated using Hilbert orthogonal transformations；
The 2 road orthogonal basis functions generated using the Walsh sequence pairs that length is N are weighted respectively, generation 2N roads chaos orthogonal basis function；Will
1st road orthogonal basis function is transmitted as signal is referred in in-phase channel；The use state encoder information that will be currently transmitted
Bits switch is 2N coefficient of regime, and each coefficient of regime is multiplied with corresponding chaos orthogonal basis function respectively, generation it is polynary
Orthogonal demodulation signal transmits in orthogonal channel.Reference signal and information signal by I/Q transmissions are weight in time domain
Folded, it is orthogonal in phase, the orthogonality of the corresponding information signal of distinct symbols is by Hilbert conversion and Walsh
What the orthogonality of code ensured.The step of demodulation method is：Signal is received by antenna, will receive signal respectively with same phase, orthogonal
Sinusoidal carrier is multiplied；2 road product signal of gained passes through 2 road matched filters respectively, and the output to 2 road matched filters is adopted
Sample, recovers discrete reference signal sequence and discrete message signal sequence respectively；According to the discrete reference signal sequence recovered,
2 road orthogonal basis functions are generated using Hilbert orthogonal transformations；By N rank Walsh sequencers generation N roads orthogonal code, life is used
Into N roads Walsh sequences 2 road orthogonal basis functions are weighted respectively, recover 2N roads chaos orthogonal basis function sequence；Will be extensive
The discrete message signal sequence appeared again is related to 2N roads chaos orthogonal basis function sequence income respectively, obtains 2N correlation；Choosing
It is 1 to select the corresponding coefficient of regime of maximum related value, use state decoder output log22N information bits.
Method flow：
Step 1：The scattered date that the length that chaos signal generator is produced according to chaos signal generator is β is repeated to believe
Number, use N-1 roads delay unit D1,...,DN-1The discrete repetition chaotic signal in 1 road is produced, signal length is N β；
Step 2：Hilbert orthogonal transformations are carried out to the discrete chaotic signal that repeats generated in step 1,2 roads of generation are orthogonal
Basic function；
Step 3：It is N by N rank Walsh sequencers generation N roads length, the Walsh orthogonal code sequences that the cycle is N, makes
It is weighted respectively with the 2 road orthogonal basis functions generated in the N roads Walsh sequence pair steps 2 of generation, generation 2N roads chaos is orthogonal
Basis function signal；
Step 4：The use state encoder log that will be currently transmitted22N information bit b0,b1,...,blog22NConversion
For 2N coefficient of regime a0,a1,...,a2N-1, wherein information bit is " 0 " or " 1 "；
Step 5：By the 2N coefficient of regime generated in step 4 the 2N roads chaos orthogonal basis letter with being generated in step 3 respectively
Number signal multiplication, selects a polynary orthogonal demodulation signal of conduct from the chaos orthogonal basis function signal of 2N roads；
Step 6：Using the 1st tunnel chaos orthogonal basis function generated in step 3 as signal is referred to, by what is generated in step 5
Polynary orthogonal demodulation signal is as information signal, and using two squared raised cosine roll-off filters, (time domain impulse response is hT
(t)), it is respectively completed the signal shaping filtering of reference signal and information signal；
Step 7：The reference signal obtained after shaping filter in step 6, information signal are carried with same phase, orthogonal sinusoidal respectively
Ripple is multiplied；
Step 8：Launched after the 2 road signals obtained in step 7 are added by antenna, use orthogonal I/Q channels
Simultaneous transmission reference signal and information signal, reference signal are transmitted in in-phase channel, and information signal transmits in orthogonal channel；
Step 9：In recipient, by antenna received signal respectively with same phase, orthogonal sinusoidal carrier multiplication；
Step 10：The 2 road product signals obtained in step 9 are passed through into 2 road matched filters (time domain impulse response h respectivelyr
(t)), and the output to 2 road matched filters samples, and recovers discrete reference signal sequence and discrete message signal respectively
Sequence；
Step 11：Mixed with the discrete repetition generated in the discrete reference signal sequence alternative steps 1 recovered in step 10
Ignorant signal, in recipient's repeat step 2 to step 3, recovers 2N roads chaos orthogonal basis function sequence；
Step 12：The discrete letter that will be recovered in the 2N roads chaos orthogonal basis function sequence obtained in step 11 and step 10
Information signal sequence is related respectively, obtains 2N correlation；
Step 13：According to the 2N correlation obtained in step 12, select the corresponding coefficient of regime of correlation of maximum for
1, use state decoder output log22N demodulating information bits.
The discrete chaotic signal that repeats of above-mentioned steps 1 of the present invention meets in a symbol time：
xkβ+i=xi, 0≤i ＜ β, 0≤k ＜ N
The information bit of the present invention is " 0 " or " 1 ", and log is transmitted in a symbol time22N information bit b0,
b1,...,blog22N, the information bit and the coefficient of regime a of the interior transmission of a symbol time0,a1,...,a2N-1Meet
The 2 tunnel chaos orthogonal basis functions produced in above-mentioned steps 2 of the present invention are the chaos sequence that length is N β, and full
Foot：
。
The same phase of the present invention, the centre frequency f of orthogonal sinusoidal carrier wave0With Walsh sequence symbol cycle TscMeet：
The present invention is overlapping in time domain by the reference signal and information signal of I/Q transmissions, is in phase
Orthogonal, the orthogonality of the corresponding information signal of distinct symbols is ensured by the orthogonality of Hilbert conversion and Walsh codes
's.
Beneficial effect：
1st, the present invention can avoid using delay unit in receivers.
2nd, The present invention reduces the number of the delay unit used in transmitters.
3rd, the present invention is effectively improved the Bit Transmission Rate of system.
4th, present invention improves the bit error code performance of system, lower bit error rate is obtained.
Brief description of the drawings
The spatial structure of Tu1Wei 2N roads orthogonal basis function signal is (i.e.：N=4) schematic diagram.
Fig. 2 attaches most importance to the composition structure diagram of multiple chaos signal generator.
Fig. 3 is the structure diagram of the polynary orthogonal chaos shift keying modulation device of the present invention.
Fig. 4 is the structure diagram of the polynary orthogonal chaos offset keying demodulator of the present invention.
Fig. 5 is for the polynary orthogonal chaos offset keying (N=4, N=16) of the present invention with QCSK, DCSK in additive Gaussian white noise
Error performance comparison diagram in Acoustic channel.
Fig. 6 is flow chart of the method for the present invention.
Embodiment
The invention is described in further detail with reference to Figure of description.
Embodiment one
As shown in Figure 1, selection in a symbol time scattered date number of samples N β for 128 when, using the bar of N=4
Part implements 8 yuan of orthogonal chaos offset keyings.
As shown in Fig. 2, it is as follows to repeat the chaos signal generator course of work：
(1) in the 1st time slot [0, Ts] in, switch S1 is directly connected with chaos signal generator, repeats chaotic signal hair
Raw device directly exports a scattered date signal samples of β (β=32) that current chaos signal generator produces；In the 2nd time slot
[Ts,2Ts] in, switch S1Connect with delay unit D1, repeat chaos signal generator by the output signal of chaos signal generator
Exported after 32 points of delay, i.e., export the signal exported in the 1st time slot again；And so on, what is be made of 4 time slots
In one symbol time [0, T], the signal that chaos signal generator exports chaos signal generator in the 1st time slot is repeated
Output is repeated 4 times, produces 128 scattered date sampled value { x0,x1,...,x127, which is reference signal sequence
Row, and meet following formula：
xkβ+i=xi, 0≤i ＜ β, 0≤k ＜ N
As shown in figure 3, the modulator course of work is as follows：
(2) according to the chaos sequence produced in (1), using Hilbert wave filters construct another length for N β (N β=
128) chaos sequence2 road orthogonal basis functions of generation meet：
(3) 4 rank Walsh code generators G1Generate the Walsh code sequences [W that 4 tunnel length are 40,W1,W2,W3], use this
The 2 road orthogonal basis functions produced in Walsh codes sequence pair (2) are weighted, and generate 8 tunnel chaos orthogonal basis function signal (such as Fig. 1
It is shown).Specific practice：W0,W1,W2,W3The 1st respectively to the scattered date sequence { x in the 1st time slot0,x1,...,x31}
WithWeighting, W0,W1,W2,W3The 2nd respectively to the scattered date sequence { x in the 2nd time slot32,x33,...,
x63AndWeighting, W0,W1,W2,W3The 3rd respectively to the scattered date sequence { x in the 3rd time slot64,
x65,...,x95AndWeighting, W0,W1,W2,W3The 4th respectively to the scattered date sequence in the 4th time slot
{x96,x97,...,x127AndWeighting.
(4) according to the log to be transmitted in current symbol time22N(log22N=3) position information bit b0,b1,...,
blog22N, state encoder generation 2N (2N=8) line state coefficient a0,a1,...,a2N-1
(5) by 8 line state coefficients of generation in (4), 8 tunnel chaos orthogonal basis function signal phases with generation in (3) respectively
Multiply, 8 road product signals are added afterwards, therefrom select 1 roadbed function signal as polynary orthogonal demodulation signal；
(6) by the polynary orthogonal demodulation signal of generation in the 1st tunnel chaos orthogonal basis function signal of generation in (3) and (5)
Respectively by 2 road squared raised cosine roll-off filters, pulse shape filter is completed, generates the reference letter for being adapted to transmission respectively
Number and information signal；
(7) by reference signal of generation in (6) and information signal respectively with same phase sinusoidal carrier and orthogonal sinusoidal carrier wave phase
Multiply；
(8) finally, the 2 road product signals that will be obtained in (7) are launched after being added by antenna, wherein same phase, orthogonal
The centre frequency f of sinusoidal carrier0With Walsh sequence symbol cycle TscMeet：
As shown in figure 4, the demodulator concrete implementation process of the present invention is including as follows：
(9) signal for the receiving antenna same phase sinusoidal carrier and orthogonal sinusoidal carrier multiplication with receiving terminal respectively, obtains
The 2 road product signals arrived；
(10) the 2 road product signals obtained in (9) are passed through into 2 road matched filters respectively, in t=iTcAt the moment, switch S2
And S3Output sampling to 2 road matched filters respectively, recovers the discrete reference signal sequence { y that length is 128R,0,
yR,1,...,yR,127And discrete message signal sequence { yI,0,yI,1,...,yI,127}；
(11) according to the reference signal sequence recovered in (10), it is corresponding mixed that 2 tunnels are recovered using Hilbert wave filters
Ignorant orthogonal basis function sequence { yR,0,yR,1,...,yR,127And
(12) 4 rank Walsh code generators G2Generate the Walsh code sequences [W that 4 tunnel length are 40,W1,W2,W3], use this
The 2 tunnel chaos orthogonal basis function sequences recovered in Walsh codes sequence pair (11) are weighted, and recover 8 tunnel chaos orthogonal basis
The sequence of function.Specific practice：W0,W1,W2,W3The 1st respectively to the scattered date sequence { y in the 1st time slotR,0,
yR,1,...,yR,31AndWeighting, W0,W1,W2,W3The 2nd respectively to the scattered date in the 2nd time slot
Sequence { yR,32,yR,33,...,yR,63AndWeighting, W0,W1,W2,W3The 3rd respectively to the 3rd time slot
Interior scattered date sequence { yR,64,yR,65,...,yR,95AndWeighting, W0,W1,W2,W3The 4th difference
To the scattered date sequence { y in the 4th time slotR,96,yR,97,...,yR,127AndWeighting.
(13) the discrete message signal sequence { y that will be recovered in (10)I,0,yI,1,...,yI,127Respectively with it is extensive in (12)
The 8 tunnel chaos orthogonal basis function sequences appeared again are multiplied, and sum to product signal, obtain 8 road correlations；
(14) 8 road correlations of generation in (13) are compared, the corresponding coefficient of regime of correlation for choosing maximum is 1, other 7
Line state coefficient is 0, and 8 obtained line state coefficients are sent into state decoder, exports 3 information bit decodings.
The present invention is using Computer Simulation to 8 yuan of orthogonal chaos offset keyings (N=4) and 32 yuan of orthogonal chaos offset keyings
(N=16) it is transmitted experiment.In experiment, the information bit number of transmission is 106, scattered date signal is by second order
Chebyshev polynomial mapsProducing, chaotic signal sample frequency is 1MHz, symbol duration T=128 μ s,
Equivalent signal sampling points are 128 in each symbol time, centre carrier frequency f0=20MHz, squared raised cosine roll-off filter
Ripple device rolloff-factor α=0.5；In 8 yuan of orthogonal chaos offset keyings, equivalent signal sampling points β=32 in code-element period, 4
4 rank Walsh code sequences of road are respectively W0=[1,1,1,1]T,W1=[1, -1,1, -1]T,W2=[1,1, -1, -1]TAnd W3=
[1,-1,-1,1]T；In 32 yuan of orthogonal chaos offset keyings, equivalent signal sampling number β=8 in code-element period, 16 tunnel, 16 rank
Walsh code sequences are respectively W0=[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]T,W1=[1, -1,1, -1,1, -1,
1, -1,1, -1,1, -1,1, -1,1, -1]T,
W2=[1,1, -1, -1,1,1, -1, -1,1,1, -1, -1,1,1, -1, -1]T,W3=[1, -1, -1,1,1, -1, -1,
1,1, -1, -1,1,1, -1, -1,1]T,
W4=[1,1,1,1, -1, -1, -1, -1,1,1,1,1, -1, -1, -1, -1]T,W5=[1, -1,1, -1, -1,1, -1,
1,1, -1,1, -1, -1,1, -1,1]T,
W6=[1,1, -1, -1, -1, -1,1,1,1,1, -1, -1, -1, -1,1,1]T,W7=[1, -1, -1,1, -1,1,1, -
1,1, -1, -1,1, -1,1,1, -1]T,
W8=[1,1,1,1,1,1,1,1, -1, -1, -1, -1, -1, -1, -1, -1]T,W9=[1, -1,1, -1,1, -1,1, -
1,-1,1,-1,1,-1,1,-1,1]T,
W10=[1,1, -1, -1,1,1, -1, -1, -1, -1,1,1, -1, -1,1,1]T,W11=[1, -1, -1,1,1, -1, -
1,1,-1,1,1,-1,-1,1,1,-1]T,
W12=[1,1,1,1, -1, -1, -1, -1, -1, -1, -1, -1,1,1,1,1]T,W13=[1, -1,1, -1, -1,1, -
1,1,-1,1,-1,1,1,-1,1,-1]T,
W14=[1,1, -1, -1, -1, -1,1,1, -1, -1,1,1,1,1, -1, -1]T,W15=[1, -1, -1,1, -1,1,
1, -1, -1,1,1, -1,1, -1, -1,1]T,.
Fig. 5 give the orthogonal chaos offset keying (N=4) of 8 yuan emulated in additive white Gaussian noise channel, 32 yuan
The bit error rate of orthogonal chaos offset keying (N=16).As control, give what emulation under the same terms obtained in figure
The bit error rate of DCSK and QCSK.It can be seen from the figure that polynary orthogonal chaos offset keying has best bit error code
Performance, and this performance advantage can be more obvious with the increase of N.
Embodiment two
As shown in Fig. 2, the present invention also design is a kind of to repeat chaos signal generator, the generator is single using the delay of N-1 roads
Member, it is that the discrete of N β repeats chaotic signal to produce length, and the signal of the discrete repetition chaotic signal in each time slot is identical.Its
Structure includes：The delay unit D that chaos signal generator, the delay of N-1 roads are β1,D2,…DN-1And switching switch S1。
As shown in figure 3, a kind of polynary orthogonal chaos shift keying modulation device of the present invention also design, its structure include：Repeat
Chaos signal generator, N rank Walsh code generators G1, state encoder, Hilbert converters, 2N roads coefficient multiplier, 2N
Road weighting multipliers, 2 road pulse shaping filters, 2 road-load ripple multipliers and 1 tunnel adder.
As shown in figure 4, a kind of polynary orthogonal chaos offset keying demodulator of the present invention also design, its structure include：N ranks
Walsh code generators G2, 2 road-load ripple multipliers, 2 road matched filters, 2 road sampling switch S2And S3, 1 road Hilbert conversion
Device, 2N roads weighting multipliers, 2N roads coefficient multiplier, N roads summer and 1 road comparator ＆ state decoders.
The present invention uses orthogonal I/Q transmissions reference signal and information signal, both are overlapping in time domain, are eliminated
The delay unit of receiving terminal, while the number of transmitting terminal delay unit is reduced to N-1.Corresponding function is by analog multiplier
Realized with adder, the complexity of realization can be substantially reduced, be highly susceptible to integrated circuit realization.
The present invention is based on chaotic carrier, and information signal is produced using polynary orthogonal modulation, more in a symbol time transmission
Position information bit, the Bit Transmission Rate that the system of substantially increasing can be realized, while reduce the bit error rate.
Claims (7)
1. a kind of polynary orthogonal chaos shift keying modulation demodulation method, it is characterised in that described method includes following steps：
Step 1：The scattered date signal that the length that chaos signal generator is produced according to chaos signal generator is β is repeated, is made
With N-1 roads delay unit D1,...,DN-1The discrete repetition chaotic signal in 1 road is produced, signal length is N β；
Step 2：Hilbert orthogonal transformations are carried out to the discrete chaotic signal that repeats generated in step 1, generate 2 road orthogonal basis letters
Number；
Step 3：It is N by N rank Walsh sequencers generation N roads length, the Walsh orthogonal code sequences that the cycle is N, uses life
Into N roads Walsh sequence pair steps 2 in the 2 road orthogonal basis functions that generate be weighted respectively, generation 2N roads chaos orthogonal basis letter
Number signal；
Step 4：The use state encoder log that will be currently transmitted22N information bitsBe converted to 2N state
Coefficient a0,a1,...,a2N-1, wherein information bit is " 0 " or " 1 "；
Step 5：The 2N coefficient of regime generated in step 4 is believed with the 2N roads chaos orthogonal basis function generated in step 3 respectively
Number be multiplied, from the chaos orthogonal basis function signal of 2N roads select a polynary orthogonal demodulation signal of conduct；
Step 6：It is polynary by what is generated in step 5 using the 1st tunnel chaos orthogonal basis function generated in step 3 as signal is referred to
Orthogonal demodulation signal is as information signal, and using two squared raised cosine roll-off filters, time domain impulse response is hT(t), divide
Not Wan Cheng reference signal and information signal signal shaping filtering；
Step 7：By the reference signal obtained after shaping filter in step 6, information signal respectively with same phase, orthogonal sinusoidal carrier wave phase
Multiply；
Step 8：Launched after the 2 road signals obtained in step 7 are added by antenna, using orthogonal I/Q channels at the same time
Transmission of reference signals and information signal, reference signal are transmitted in in-phase channel, and information signal transmits in orthogonal channel；
Step 9：In recipient, by antenna received signal respectively with same phase, orthogonal sinusoidal carrier multiplication；
Step 10：The 2 road product signals obtained in step 9 are passed through into 2 road matched filters, time domain impulse response h respectivelyr(t),
And the output to 2 road matched filters samples, and recovers discrete reference signal sequence and discrete message signal sequence respectively；
Step 11：Believed with the discrete chaos that repeats generated in the discrete reference signal sequence alternative steps 1 recovered in step 10
Number, in recipient's repeat step 2 to step 3, recover 2N roads chaos orthogonal basis function sequence；
Step 12：The discrete message recovered in the 2N roads chaos orthogonal basis function sequence obtained in step 11 and step 10 is believed
Number sequence is related respectively, obtains 2N correlation；
Step 13：According to the 2N correlation obtained in step 12, the corresponding coefficient of regime of correlation for selecting maximum is 1, is made
Log is exported with state decoder22N demodulating information bits.
2. the polynary orthogonal chaos shift keying modulation demodulation method of one kind according to claim 1, it is characterised in that：It is described
The discrete chaotic signal that repeats of step 1 meets in a symbol time：
xkβ+i=xi, 0≤i ＜ β, 0≤k ＜ N.
3. the polynary orthogonal chaos shift keying modulation demodulation method of one kind according to claim 1, it is characterised in that：It is described
The information bit of method is " 0 " or " 1 ", and log is transmitted in a symbol time22N information bitsOne
The information bit of transmission and the coefficient of regime a in symbol time0,a1,...,a2N-1Meet
4. the polynary orthogonal chaos shift keying modulation demodulation method of one kind according to claim 1, it is characterised in that：It is described
The 2 tunnel chaos orthogonal basis functions produced in step 2 are the chaos sequence that length is N β, and are met：
5. the polynary orthogonal chaos shift keying modulation demodulation method of one kind according to claim 1, it is characterised in that：It is described
The same phase of method, the centre frequency f of orthogonal sinusoidal carrier wave0With Walsh sequence symbol cycle TscMeet：
<mrow>
<msub>
<mi>f</mi>
<mn>0</mn>
</msub>
<mo>=</mo>
<mfrac>
<mi>k</mi>
<msub>
<mi>T</mi>
<mi>c</mi>
</msub>
</mfrac>
<mo>,</mo>
<mi>k</mi>
<mo>></mo>
<mo>></mo>
<mn>1.</mn>
</mrow>
6. the polynary orthogonal chaos shift keying modulation demodulation method of one kind according to claim 1, it is characterised in that：It is described
The reference signal and information signal that method passes through I/Q transmissions are overlapping in time domain, are orthogonal, difference in phase
The orthogonality of the corresponding information signal of symbol is ensured by the orthogonality of Hilbert conversion and Walsh codes.
7. the polynary orthogonal chaos shift keying modulation demodulation method of one kind according to claim 6, it is characterised in that：It is described
Method by antenna receive signal, will receive signal respectively with same phase, orthogonal sinusoidal carrier multiplication；Gained 2 road product signal point
Not Jing Guo 2 road matched filters, the output to 2 road matched filters samples, and recovers discrete reference signal sequence respectively
With discrete message signal sequence；According to the discrete reference signal sequence recovered, 2 tunnels are being generated just using Hilbert orthogonal transformations
Hand over basic function；By N rank Walsh sequencers generation N roads orthogonal code, using generation N roads Walsh sequences respectively to 2 tunnels just
Hand over basic function to be weighted, recover 2N roads chaos orthogonal basis function sequence；The discrete message signal sequence recovered is distinguished
It is related to 2N roads chaos orthogonal basis function sequence income, obtain 2N correlation；Select the corresponding coefficient of regime of maximum related value
For 1, use state decoder output log22N information bits.
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| CN106209712B (en) * | 2016-06-22 | 2019-04-16 | 厦门大学 | Difference chaotic shift keying modulation demodulating equipment based on the modulation of code subscript |
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| CN108365945B (en) * | 2018-01-24 | 2020-10-27 | 南京邮电大学 | Differential chaotic shift keying modem and method based on two-way index modulation |
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