CN105187347A - Multivariate orthogonal chaos shift keying modulation/demodulation method - Google Patents
Multivariate orthogonal chaos shift keying modulation/demodulation method Download PDFInfo
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- H—ELECTRICITY
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- 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
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- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
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Abstract
The invention discloses a multivariate orthogonal chaos shift keying modulation/demodulation method. According to the method, Hilbert orthogonal transformation and orthogonal Walsh sequence weighting are carried out chaos signals to construct a plurality of mutually- orthogonal chaos carrier signals; and the modulation/demodulation is carried out by utilizing a multivariate orthogonal modulation method. According to the multivariate orthogonal chaos shift keying modulation/demodulation method, the delay units in the existing binary/N-nary DCSK receivers are eliminated, the delay units in transmitters are decreased, the realizing complexity is reduced, the bit transmission speed of the system is greatly improved and the bit error rate performance of the system is enhanced to a relatively great extent.
Description
Technical field
The present invention relates to a kind of polynary orthogonal chaos shift keying modulation demodulation method, belong to communication technical field.
Technical background
At present, the typical apply of chaology in secure communication and spread spectrum communication, its chaos digital modulation technique not only can retain low probability of intercept that conventional spread spectrum communication system has and alleviate the characteristics such as multipath effect, but also show unique advantage in other many, comprising: the hardware cost reducing system; Promote communications security; Be applicable to effectively distinguishing different user in a multi-user environment; Improve the performance etc. of spread spectrum communication system.Therefore, chaos digital modulation technique has become one of hot issue that nonlinear science and Information Center educational circles pay close attention to and study.
But, under actual channel condition, lack at present and realize the reliable of Chaotic Synchronous and effective method at receiving terminal.Therefore, existing chaos digital modulation-demo-demodulation method based on transmission reference method, namely all sends to receiving terminal the signal of carrier signal and carry information mostly.Wherein, difference chaotic offset keying (DifferentialChaosShiftKeying, DCSK) modulation-demo-demodulation method can obtain good error performance, without the need to completing channel estimating, under many practical application, (that is: comprising wireless personal local area network, wireless sensor network etc.) all show very strong competitiveness.But because the time and power taking half sends not containing the reference signal of any information, the Bit Transmission Rate of DCSK system and band efficiency are all lower.For this reason, four phase chaos offset keying (QuadratureChaosShiftKeying, QCSK) use 2 orthogonal road chaotic signals to modulate, attainable Bit Transmission Rate is doubled, but the bit error code performance of system is not improved.In addition, due to DCSK/QCSK transmission of reference signals and information signal within the different time periods, orthogonal to ensure both, thus transmitting terminal and receiving terminal all must use delay unit.When ultra wideband transmissions, adopt existing technique integrated simulation delay unit possibility hardly, the delay unit that digital form realizes then will consume huge power.For this problem, code moves difference chaotic offset keying (Code-ShiftedDifferentialChaosShiftKeying, CS-DCSK) modulation-demo-demodulation method and uses 2 road Walsh sequences to distinguish the reference signal and information signal simultaneously transmitted.Although CS-DCSK eliminates the delay unit of receiving terminal, transmitting terminal introduces more delay unit, and the Bit Transmission Rate of system is still on the low side, and system error performance does not but promote.And the present invention can solve problem above well.
Summary of the invention
The object of the invention is for existing chaos digital modulation-demo-demodulation method Bit Transmission Rate problem on the low side, propose a kind of polynary orthogonal chaos shift keying modulation demodulation method, the repetition chaos signal generator of the method produces the discrete repetition chaotic signal that length is N β; According to discrete repetition chaotic signal, Hilbert orthogonal transform is utilized to generate 2 road orthogonal basis functions; The 2 road orthogonal basis function weightings respectively using the Walsh sequence pair that length is N to generate, generate 2N road chaos orthogonal basis function; Using the 1st road orthogonal basis function as with reference to signal, transmit in in-phase channel; The current information bit that will transmit is converted to 2N coefficient of regime by using state encoder, and each coefficient of regime is multiplied with corresponding chaos orthogonal basis function respectively, and the polynary orthogonal demodulation signal of generation transmits in orthogonal channel.Being overlapping in time domain by the reference signal of I/Q transmission and information signal, phase place is orthogonal, and the orthogonality of the information signal that distinct symbols is corresponding is by the orthogonality guarantee of Hilbert conversion and Walsh code.The step of demodulation method is: by antenna receiving signal, by Received signal strength respectively with homophase, orthogonal sinusoidal carrier multiplication; Gained 2 road product signal, respectively through No. 2 matched filters, is sampled to the output of No. 2 matched filters, recovers discrete reference signal sequence and discrete message burst respectively; According to the discrete reference signal sequence recovered, Hilbert orthogonal transform is used to generate 2 road orthogonal basis functions; Generate N road orthogonal code by N rank Walsh sequencer, use the N road Walsh sequence generated to be weighted 2 road orthogonal basis functions respectively, recover 2N road chaos orthogonal basis function sequence; By relevant to 2N road chaos orthogonal basis function sequence income respectively for the discrete message burst recovered, obtain 2N correlation; The coefficient of regime selecting maximum related value corresponding is 1, and using state decoder exports log
22N position information bit.
Method flow:
Step 1: repeat the scattered date signal that chaos signal generator is β according to the length that chaos signal generator produces, use N-1 road delay unit D
1..., D
n-1produce the 1 discrete repetition chaotic signal in road, signal length is N β;
Step 2: Hilbert orthogonal transform is carried out to the discrete repetition chaotic signal generated in step 1, generates 2 road orthogonal basis functions;
Step 3: generate the Walsh orthogonal code sequence that N road length is N, the cycle is N by N rank Walsh sequencer, uses the 2 road orthogonal basis functions generated in the N road Walsh sequence pair step 2 generated to be weighted respectively, generates 2N road chaos orthogonal basis function signal;
Step 4: using state encoder is by the current log that will transmit
22N position information bit b
0, b
1..., b
log22Nbe converted to 2N coefficient of regime a
0, a
1..., a
2N-1, wherein information bit is " 0 " or " 1 ";
Step 5: by 2N coefficient of regime generating in step 4 respectively with the 2N road chaos orthogonal basis function signal multiplication that generates in step 3, from the chaos orthogonal basis function signal of 2N road, selection one is as polynary orthogonal demodulation signal;
Step 6: using the 1st tunnel chaos orthogonal basis function of generation in step 3 as reference signal, using the polynary orthogonal demodulation signal of generation in step 5 as information signal, (time domain impulse response is h to use two squared raised cosine roll-off filters
t(t)), complete the signal shaping filtering of reference signal and information signal respectively;
Step 7: by obtain after shaping filter in step 6 reference signal, information signal respectively with homophase, orthogonal sinusoidal carrier multiplication;
Step 8: gone out after the 2 road signal plus obtained in step 7 by antenna transmission, use orthogonal I/Q channel transmission of reference signals and information signal simultaneously, reference signal is transmitted in in-phase channel, and information signal transmits in orthogonal channel;
Step 9: recipient, by antenna receive signal respectively with homophase, orthogonal sinusoidal carrier multiplication;
Step 10: by the 2 road product signals that obtain in step 9 respectively through No. 2 matched filters (time domain impulse response h
r(t)), and the output of No. 2 matched filters is sampled, recover discrete reference signal sequence and discrete message burst respectively;
Step 11: with the discrete repetition chaotic signal generated in the discrete reference signal sequence alternative steps 1 recovered in step 10, repeat step 2 to step 3 recipient, recover 2N road chaos orthogonal basis function sequence;
Step 12: by relevant respectively to the discrete message burst recovered in step 10 for the 2N road chaos orthogonal basis function sequence obtained in step 11, obtain 2N correlation;
Step 13: according to 2N the correlation obtained in step 12, selects the coefficient of regime that maximum correlation is corresponding to be 1, and using state decoder exports log
22N position demodulating information bit.
The discrete repetition chaotic signal of above-mentioned steps 1 of the present invention meets in a symbol time:
x
kβ+i＝x
i，0≤i＜β，0≤k＜N。
Information bit of the present invention is " 0 " or " 1 ", in a symbol time, transmit log
22N position information bit b
0, b
1..., b
log22N, the information bit of transmission in a symbol time and described coefficient of regime a
0, a
1..., a
2N-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 meet:
The centre frequency f of homophase of the present invention, orthogonal sinusoidal carrier wave
0with Walsh sequence code element cycle T
cmeet:
The present invention is overlapping by the reference signal of I/Q transmission and information signal in time domain, phase place is orthogonal, and the orthogonality of the information signal that distinct symbols is corresponding is by the orthogonality guarantee of Hilbert conversion and Walsh code.
Beneficial effect:
1, the present invention can avoid using delay unit in receivers.
2, The present invention reduces the number of the delay unit used in transmitters.
3, the present invention improves the Bit Transmission Rate of system effectively.
4, present invention improves the bit error code performance of system, obtain lower bit error rate.
Accompanying drawing explanation
Spatial structure (that is: the N=4) schematic diagram of Tu1Wei 2N road orthogonal basis function signal.
Fig. 2 attaches most importance to the composition structural representation of multiple chaos signal generator.
Fig. 3 is the structural representation of the polynary orthogonal chaos shift keying modulation device of the present invention.
Fig. 4 is the structural representation of the polynary orthogonal chaos offset keying demodulator of the present invention.
Fig. 5 is the polynary orthogonal chaos offset keying (N=4, N=16) of the present invention and QCSK, DCSK error performance comparison diagram in additive white Gaussian noise channel.
Fig. 6 is method flow diagram of the present invention.
Embodiment
Below in conjunction with Figure of description, the invention is described in further detail.
Embodiment one
As shown in Figure 1, when selecting that scattered date number of samples N β is 128 in a symbol time, the condition of N=4 is adopted to implement 8 yuan of orthogonal chaos offset keyings.
As shown in Figure 2, the chaos signal generator course of work is repeated as follows:
(1) at the 1st time slot [0, T
s] in, switch S 1 is directly connected with chaos signal generator, repeats the individual scattered date signal sample of β (β=32) that chaos signal generator directly exports the generation of current chaos signal generator; At the 2nd time slot [T
s, 2T
s] in, switch S
1connect with delay unit D1, repeat chaos signal generator and export after output signal time delay 32 points of chaos signal generator, namely again export the signal exported in the 1st time slot; By that analogy, in the symbol time [0, T] be made up of 4 time slots, repeat chaos signal generator and the signal that chaos signal generator exports in the 1st time slot is repeated 4 output, produce 128 scattered date sampled value { x
0, x
1..., x
127, this scattered date sequence is reference signal sequence, and meets following formula:
x
kβ+i＝x
i，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), the chaos sequence that another length of Hilbert filter design is N β (N β=128) is used
the 2 road orthogonal basis functions generated meet:
(3) 4 rank Walsh code generator G
1generate the Walsh code sequence [W that 4 tunnel length are 4
0, W
1, W
2, W
3], use the 2 road orthogonal basis functions produced in this Walsh code sequence pair (2) to be weighted, generate 8 tunnels chaos orthogonal basis function signal (as shown in Figure 1).Specific practice: W
0, W
1, W
2, W
3the 1st respectively to the scattered date sequence { x in the 1st time slot
0, x
1..., x
31and
weighting, W
0, W
1, W
2, W
3the 2nd respectively to the scattered date sequence { x in the 2nd time slot
32, x
33..., x
63and
weighting, W
0, W
1, W
2, W
3the 3rd respectively to the scattered date sequence { x in the 3rd time slot
64, x
65..., x
95and
weighting, W
0, W
1, W
2, W
3the 4th respectively to the scattered date sequence { x in the 4th time slot
96, x
97..., x
127and
weighting.
(4) according to the log that will transmit in current symbol time
22N (log
22N=3) position information bit b
0, b
1..., b
log22N, state encoder generates 2N (2N=8) line state coefficient a
0, a
1..., a
2N-1
(5) by the 8 line state coefficients generated in (4) the middle 8 tunnel chaos orthogonal basis function signal multiplications generated with (3) respectively, afterwards 8 road product signals are added, therefrom select 1 roadbed function signal as polynary orthogonal demodulation signal;
(6) by polynary orthogonal demodulation signal of generating in the 1st tunnel chaos orthogonal basis function signal generated in (3) and (5) respectively by 2 road squared raised cosine roll-off filters, complete pulse shape filter, generate the reference signal being applicable to transmission and information signal respectively;
(7) by the reference signal that generates in (6) and information signal respectively with homophase sinusoidal carrier and orthogonal sinusoidal carrier multiplication;
(8) last, gone out by antenna transmission after the 2 road product signals obtained in (7) are added, the wherein centre frequency f of homophase, orthogonal sinusoidal carrier wave
0with Walsh sequence code element cycle T
cmeet:
As shown in Figure 4, the implementation procedure that demodulator of the present invention is concrete comprises as follows:
(9) signal antenna received respectively with homophase sinusoidal carrier and the orthogonal sinusoidal carrier multiplication of receiving terminal, the 2 road product signals obtained;
(10) by the 2 road product signals that obtain in (9) respectively through No. 2 matched filters, at t=iT
cmoment, switch S
2and S
3respectively the output of No. 2 matched filters is sampled, recover the discrete reference signal sequence { y that length is 128
r, 0, y
r, 1..., y
r, 127and discrete message burst { y
i, 0, y
i, 1..., y
i, 127;
(11) according to the reference signal sequence recovered in (10), Hilbert filter is used to recover chaos orthogonal basis function sequence { y corresponding to 2 tunnels
r, 0, y
r, 1..., y
r, 127and
(12) 4 rank Walsh code generator G
2generate the Walsh code sequence [W that 4 tunnel length are 4
0, W
1, W
2, W
3], use the 2 tunnel chaos orthogonal basis function sequences recovered in this Walsh code sequence pair (11) to be weighted, recover 8 tunnel chaos orthogonal basis function sequences.Specific practice: W
0, W
1, W
2, W
3the 1st respectively to the scattered date sequence { y in the 1st time slot
r, 0, y
r, 1..., y
r, 31and
weighting, W
0, W
1, W
2, W
3the 2nd respectively to the scattered date sequence { y in the 2nd time slot
r, 32, y
r, 33..., y
r, 63and
weighting, W
0, W
1, W
2, W
3the 3rd respectively to the scattered date sequence { y in the 3rd time slot
r, 64, y
r, 65..., y
r, 95and
weighting, W
0, W
1, W
2, W
3the 4th respectively to the scattered date sequence { y in the 4th time slot
r, 96, y
r, 97..., y
r, 127and
weighting.
(13) the discrete message burst { y will recovered in (10)
i, 0, y
i, 1..., y
i, 127be multiplied with the 8 tunnel chaos orthogonal basis function sequences recovered in (12) respectively, and to product signal summation, obtain 8 road correlations;
(14) compare the 8 road correlations generated in (13), choosing coefficient of regime corresponding to maximum correlation is 1, and other 7 line state coefficients are 0, the 8 line state coefficients obtained is sent into state decoder, exports 3 information bit decodings.
The present invention adopts Computer Simulation to carry out transmission test to 8 yuan of orthogonal chaos offset keyings (N=4) and 32 yuan of orthogonal chaos offset keyings (N=16).In test, the information bit number of transmission is 10
6, scattered date signal is by second order chebyshev polynomial map
produce, chaotic signal sample frequency is 1MHz, symbol duration T=128 μ s, and in each symbol time, the signal sampling of equivalence is counted is 128, centre carrier frequency f
0=20MHz, squared raised cosine roll-off filter rolloff-factor α=0.5; In 8 yuan of orthogonal chaos offset keyings, the signal sampling of equivalence is counted β=32 in code-element period, and 4 rank, tunnel 4 Walsh code sequences are respectively W
0=[1,1,1,1]
t, W
1=[1 ,-1,1 ,-1]
t, W
2=[1,1 ,-1 ,-1]
tand W
3=[1 ,-1 ,-1,1]
t; In 32 yuan of orthogonal chaos offset keyings, equivalent signal sampling number β=8 in code-element period, 16 rank, tunnel 16 Walsh code sequences are respectively W
0=[1,1,1,1,1,1,1,1,1,1,1,1,1,1,1,1]
t, W
1=[1 ,-1,1 ,-1,1 ,-1,1 ,-1,1 ,-1,1 ,-1,1 ,-1,1 ,-1]
t,
W
2＝[1,1,-1,-1，1,1,-1,-1，1,1,-1,-1，1,1,-1,-1]
T,W
3＝[1,-1,-1,1，1,-1,-1,1，1,-1,-1,1，1,-1,-1,1]
T,
W
4＝[1,1,1,1，-1,-1,-1,-1，1,1,1,1，-1,-1,-1,-1]
T,W
5＝[1,-1,1,-1,-1,1,-1,1，1,-1,1,-1,-1,1,-1,1]
T,
W
6＝[1,1,-1,-1，-1,-1,1,1，1,1,-1,-1，-1,-1,1,1]
T,W
7＝[1,-1,-1,1，-1,1,1,-1，1,-1,-1,1，-1,1,1,-1]
T，
W
8＝[1,1,1,1，1,1,1,1,-1,-1,-1,-1,-1,-1,-1,-1]
T,W
9＝[1,-1,1,-1,1,-1,1,-1,-1,1,-1,1,-1,1,-1,1]
T,
W
10＝[1,1,-1,-1，1,1,-1,-1,-1,-1,1,1,-1,-1,1,1]
T,W
11＝[1,-1,-1,1，1,-1,-1,1,-1,1,1,-1,-1,1,1,-1]
T,
W
12＝[1,1,1,1，-1,-1,-1,-1,-1,-1,-1,-1，1,1,1,1]
T,W
13＝[1,-1,1,-1,-1,1,-1,1,-1,1,-1,1,1,-1,1,-1]
T,
W
14＝[1,1,-1,-1，-1,-1,1,1，-1,-1,1,1，1,1,-1,-1]
T,W
15＝[1,-1,-1,1，-1,1,1,-1,-1,1,1,-1，1,-1,-1,1]
T，。
Fig. 5 gives in additive white Gaussian noise channel the bit error rate emulating the 8 yuan of orthogonal chaos offset keyings (N=4) obtained, 32 yuan of orthogonal chaos offset keyings (N=16).In contrast, the bit error rate of DCSK and QCSK obtained is emulated under giving the same terms in figure.As can be seen from the figure, polynary orthogonal chaos offset keying has best bit error code performance, and this performance advantage can be more obvious along with the increase of N.
Embodiment two
As shown in Figure 2, the present invention also designs a kind of repetition chaos signal generator, and this generator uses N-1 road delay unit, and produce the discrete repetition chaotic signal that length is N β, the signal of this discrete repetition chaotic signal in each time slot is identical.Its structure comprises: chaos signal generator, the time delay of N-1 road are the delay unit D of β
1, D
2... D
n-1and diverter switch S
1.
As shown in Figure 3, the present invention also designs a kind of polynary orthogonal chaos shift keying modulation device, and its structure comprises: repeat chaos signal generator, N rank Walsh code generator G
1, state encoder, Hilbert converter, 2N road coefficient multiplier, 2N road weighting multipliers, 2 road pulse shaping filters, 2 road carrier wave multipliers and 1 tunnel adder.
As shown in Figure 4, the present invention also designs a kind of polynary orthogonal chaos offset keying demodulator, and its structure comprises: N rank Walsh code generator G
2, 2 road carrier wave multipliers, No. 2 matched filters, 2 road sampling switch S
2and S
3, 1 road Hilbert converter, 2N road weighting multipliers, 2N road coefficient multiplier, N road summer and 1 road comparator & state decoder.
The present invention uses orthogonal I/Q transmission reference signal and information signal, and both are overlapping in time domain, eliminate the delay unit of receiving terminal, the number of transmitting terminal delay unit are reduced to N-1 simultaneously.Corresponding function is realized by analog multiplier and adder, greatly can reduce the complexity of realization, is highly susceptible to integrated circuit and realizes.
The present invention is based on chaotic carrier, use polynary quadrature modulation to produce information signal, at a symbol time transmission multidigit information bit, the Bit Transmission Rate that the system of substantially increasing can realize, reduces the error rate simultaneously.
Claims (7)
1. a polynary orthogonal chaos shift keying modulation demodulation method, it is characterized in that, described method comprises the steps:
Step 1: repeat the scattered date signal that chaos signal generator is β according to the length that chaos signal generator produces, use N-1 road delay unit D
1 ...,d
n-1produce the 1 discrete repetition chaotic signal in road, signal length is N β;
Step 2: Hilbert orthogonal transform is carried out to the discrete repetition chaotic signal generated in step 1, generates 2 road orthogonal basis functions;
Step 3: generate the Walsh orthogonal code sequence that N road length is N, the cycle is N by N rank Walsh sequencer, uses the 2 road orthogonal basis functions generated in the N road Walsh sequence pair step 2 generated to be weighted respectively, generates 2N road chaos orthogonal basis function signal;
Step 4: using state encoder is by the current log that will transmit
22N position information bit b
0,b
1 ...,b
log22Nbe converted to 2N coefficient of regime a
0,a
1 ...,a
2N-1, wherein information bit is " 0 " or " 1 ";
Step 5: by 2N coefficient of regime generating in step 4 respectively with the 2N road chaos orthogonal basis function signal multiplication that generates in step 3, from the chaos orthogonal basis function signal of 2N road, selection one is as polynary orthogonal demodulation signal;
Step 6: using the 1st tunnel chaos orthogonal basis function of generation in step 3 as reference signal, using the polynary orthogonal demodulation signal of generation in step 5 as information signal, (time domain impulse response is h to use two squared raised cosine roll-off filters
t(t)), complete the signal shaping filtering of reference signal and information signal respectively;
Step 7: by obtain after shaping filter in step 6 reference signal, information signal respectively with homophase, orthogonal sinusoidal carrier multiplication;
Step 8: gone out after the 2 road signal plus obtained in step 7 by antenna transmission, use orthogonal I/Q channel transmission of reference signals and information signal simultaneously, reference signal is transmitted in in-phase channel, and information signal transmits in orthogonal channel;
Step 9: recipient, by antenna receive signal respectively with homophase, orthogonal sinusoidal carrier multiplication;
Step 10: by the 2 road product signals that obtain in step 9 respectively through No. 2 matched filters (time domain impulse response h
r(t)), and the output of No. 2 matched filters is sampled, recover discrete reference signal sequence and discrete message burst respectively;
Step 11: with the discrete repetition chaotic signal generated in the discrete reference signal sequence alternative steps 1 recovered in step 10, repeat step 2 to step 3 recipient, recover 2N road chaos orthogonal basis function sequence;
Step 12: by relevant respectively to the discrete message burst recovered in step 10 for the 2N road chaos orthogonal basis function sequence obtained in step 11, obtain 2N correlation;
Step 13: according to 2N the correlation obtained in step 12, selects the coefficient of regime that maximum correlation is corresponding to be 1, and using state decoder exports log
22N position demodulating information bit.
2. the polynary orthogonal chaos shift keying modulation demodulation method of one according to claim 1, is characterized in that: the discrete repetition chaotic signal of described step 1 meets in a symbol time:
x
kβ+i＝x
i，0≤i＜β，0≤k＜N。
3. the polynary orthogonal chaos shift keying modulation demodulation method of one according to claim 1, is characterized in that: the information bit of described method is " 0 " or " 1 ", in a symbol time, transmit log
22N position information bit b
0,b
1 ...,b
log22N, the information bit of transmission in a symbol time and described coefficient of regime a
0,a
1 ...,a
2N-1meet
4. the polynary orthogonal chaos shift keying modulation demodulation method of one according to claim 1, is characterized in that: the 2 tunnel chaos orthogonal basis functions produced in described step 2 are the chaos sequence that length is N β, and meets:
。
5. the polynary orthogonal chaos shift keying modulation demodulation method of one according to claim 1, is characterized in that: the homophase of described method, the centre frequency f of orthogonal sinusoidal carrier wave
0with Walsh sequence code element cycle T
cmeet:
6. the polynary orthogonal chaos shift keying modulation demodulation method of one according to claim 1, it is characterized in that: described method is overlapping by the reference signal of I/Q transmission and information signal in time domain, phase place is orthogonal, the orthogonality of the information signal that distinct symbols is corresponding is ensured by the orthogonality of Hilbert conversion and Walsh code.
7. the polynary orthogonal chaos shift keying modulation demodulation method of one according to claim 6, is characterized in that: described method by antenna receiving signal, by Received signal strength respectively with homophase, orthogonal sinusoidal carrier multiplication; Gained 2 road product signal, respectively through No. 2 matched filters, is sampled to the output of No. 2 matched filters, recovers discrete reference signal sequence and discrete message burst respectively; According to the discrete reference signal sequence recovered, Hilbert orthogonal transform is used to generate 2 road orthogonal basis functions; Generate N road orthogonal code by N rank Walsh sequencer, use the N road Walsh sequence generated to be weighted 2 road orthogonal basis functions respectively, recover 2N road chaos orthogonal basis function sequence; By relevant to 2N road chaos orthogonal basis function sequence income respectively for the discrete message burst recovered, obtain 2N correlation; The coefficient of regime selecting maximum related value corresponding is 1, and using state decoder exports log
22N position information bit.
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| CN113055154B (en) * | 2021-03-26 | 2022-04-22 | 湖南工学院 | Repeatable chaos spread spectrum DCSK modulation and demodulation method and modem |
| CN114944875A (en) * | 2022-05-06 | 2022-08-26 | 中国地质大学（武汉） | Super-orthogonal electro-optical chaotic secret communication system and communication method |
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