CN106209712B - Difference chaotic shift keying modulation demodulating equipment based on the modulation of code subscript - Google Patents
Difference chaotic shift keying modulation demodulating equipment based on the modulation of code subscript Download PDFInfo
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- 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
Based on the difference chaotic shift keying modulation demodulating equipment of code subscript modulation, it is related to the digital modulation and demodulation of wireless communication.Equipped with modulator and demodulator；Modulator is equipped with chaotic carrier generator G, delay unit D1, multiplier a, multiplier b, bit to signal converter f, bit to signal converter g, Walsh code selector S, square-wave generator e and modulator and switches switch Q1；Demodulator includes D2, M receiver R, delay unit square-wave generator S1,S2,....,SM, M first via multiplier M1,1,M1,2,....,M1,M, M No. second multiplier M2,1,M2,2,....,M2,M, M accumulator Ac1,Ac2,....,AcM, M takes absolute value device Ab1,Ab2,....,AbM, comparator C, demodulator switching switch Q2, decision device h and symbol to bit converter k.
Description
Technical field
The present invention relates to the digital modulation and demodulations of wireless communication, move more particularly, to the difference chaotic modulated based on code subscript
Position keying modulation demodulating equipment.
Background technique
Difference chaotic offset keying (DCSK:Differential Chaotic Shift Keying) is one kind with chaos
Signal is the Digital Modulation Techniques of carrier wave.The wide range of chaotic signal makes DCSK become outstanding spread spectrum technic,
Alternative solution as conventional spread spectrum technology.DCSK technology is in anti-multipath jamming and realizes in inexpensive ultra-wideband communication system
It also has a good application prospect with stronger competitiveness, while in short-distance wireless communication field.
Existing difference chaotic shift keying modulation device includes chaotic carrier generator, delay unit, bit to symbol turn
Parallel operation, multiplier and switching switch；Demodulator includes delay unit, multiplier, integrator and decision device.It is assumed that the sampling of signal
Frequency is fs, the transmission cycle T of difference chaotic shift keying modulation device, equivalent spreading factor is defined as 2 β=T × fs.Modulation
Process is as follows: the chaotic carrier signal that chaotic carrier generator generates divides two-way to respectively enter switching switch and delay unit, preceding
Half period switching switching simultaneously exports first half cycle signal.It is exported after into the signal delay of delay unit, into multiplier,
Information bit in transmitted bit stream is mapped to corresponding information modulation symbol, i.e. information ratio after entering bit to signal converter
Special " 0 " or " 1 " is mapped to information modulation symbol " 1 " or " -1 " respectively, the output of bit to signal converter enter multiplier and
Signal multiplication after delay, multiplied result are sent into switching switch, switch switching at this time and export later half periodic signal.Demodulation
Process is as follows: the signal received divides two-way to respectively enter multiplier and delay unit, into after the signal delay of delay unit
It is sent into multiplier, with first half cycle signal multiplication in multiplier, multiplied result feeding accumulator, accumulation result, which is sent into, is adjudicated
Device, if accumulation result is greater than 0, adjudicating output is " 0 ", and otherwise judgement output is " 1 ".
Existing difference chaotic shift keying modulation demodulator DCSK is by reference to segment signal and modulates information segment signal
Orthogonal multiplex is realized in the time domain.In the transmission signal frame structure of DCSK, since reference segment signal does not carry information, so that existing
The shortcomings that having a DCSK there is half-bit energy losses, result in the data transmission rate and low energy efficiency of system, i.e., it is existing
With the presence of the low problem low with energy efficiency of DCSK spectrum efficiency.In recent years, with advances in technology and development, smart phone etc.
Mobile terminal device explosive growth, and to the raising that network service quality requires, result in demand of the people to bandwidth
Linearly rise.A large amount of wireless terminal device increase also results in energy consumption problem simultaneously, and energy consumption problem not only causes environment to be asked
Topic, such as CO2 emission also cause the economic problems of network operator, and such as a large amount of base stations consume energy.Furthermore increase band
Wide and realization low-power consumption is one of main target of Communication System Design, therefore increases bandwidth and promote energy efficiency at existing
Difference chaotic shift keying modulation demodulator urgent problem to be solved.
Summary of the invention
It is an object of the invention to for existing difference chaotic shift keying modulation demodulator, there is half-bit energy
The problems such as measuring the shortcomings that losing, resulting in the data transmission rate and low energy efficiency of system provides a kind of based on code subscript tune
The difference chaotic shift keying modulation demodulating equipment of system.
The present invention is equipped with modulator and demodulator；
The modulator is equipped with chaotic carrier generator G, modulator delay unit D1, the first multiplier a, the second multiplier
B, the first bit is to signal converter f, the second bit to signal converter g, Walsh code selector S, square-wave generator e and tune
Device processed switches switch Q1；The chaotic carrier signal output end of the chaotic carrier generator G meets modulator switching switch Q1 respectively
With modulator delay unit D1；The input terminal of the first multiplier a of time delayed signal output termination of modulator delay unit D1, under code
Mark modulation mapped bits stream connect the first bit to signal converter f input terminal and the second bit to signal converter g input
End, the first bit to signal converter f are mapped to corresponding code subscript modulation intelligence symbol output termination Walsh code selector
S input terminal, Walsh code selector S select M rank Walsh code W1,W2,....,WMIn corresponding Walsh code be followed by square wave
The input terminal of device e, square-wave generator e are exported after generating the signal isometric with chaotic carrier signal, meet the first multiplier a and modulation
The time delayed signal of device delay unit D1 output is multiplied, the input of the second multiplier b of multiplied result output termination of the first multiplier a
End, the second bit to signal converter g are mapped to the defeated of the second multiplier b of corresponding DCSK modulation intelligence symbol output termination
Enter to hold and be multiplied with the output of the first multiplier a, the multiplied result output termination modulator of the second multiplier b switches switch Q1；
The demodulator includes D2, M receiver R, demodulator delay unit square-wave generator S1,S2,....,SM, M
First via multiplier M1,1,M1,2,....,M1,M, M No. second multiplier M2,1,M2,2,....,M2,M, M accumulator Ac1,
Ac2,....,AcM, M takes absolute value device Ab1,Ab2,....,AbM, comparator C, demodulator switching switch Q2, decision device h and symbol
Number arrive bit converter k；By square-wave generator S1, multiplier M1,1, multiplier M2,1, accumulator Ac1With the device Ab that takes absolute value1String
Connection composition branch 1, square-wave generator S2With multiplier M1,2, multiplier M2,2, accumulator Ac2With the device Ab that takes absolute value2It is composed in series
Branch 2, and so on, square-wave generator SM, multiplier M1,M, multiplier M2,M, accumulator AcMWith the device Ab that takes absolute valueMSeries connection group
At branch M, M branch is formed altogether；The signal r that receiver R is receivedkAfter divide two-way to export, output respectively enters M points all the way
Corresponding multiplier M in branch2,1,M2,2,....,M2,M, into demodulator delay unit D2, demodulator delay is single for another way input
First D2 meets corresponding multiplier M in M branch respectively1,1,M1,2,....,M1,M, in M branch, M M rank Walsh code W1,
W2,....,WMRespectively enter corresponding M square-wave generator S1,S2,....,SMAfter export, respectively enter corresponding M multiplication
Device M1,1,M1,2,....,M1,MEnter corresponding multiplier M with the result of the signal multiplication after delay, multiplication2,1,M2,2,....,
M2,MCorresponding accumulator Ac is sent into the result of first half cycle signal multiplication, multiplication1,Ac2,....,AcMAfter export, respectively
It is sent into the node Z of corresponding demodulator switching switch Q21,Z2,....,ZMWith the corresponding device Ab that takes absolute value1,
Ab2,....,AbM, the take absolute value output of devices of M is sent into comparator C together, and comparator C detects the maximum in M output valve
Divide two-way to respectively enter symbol after value and its corresponding Walsh code subscript value and switch switch Q2 to bit converter k and demodulator,
Subscript value symbol de-maps are obtained a yard subscript modulation bit stream estimated value to bit converter k by symbol；Demodulator switching switch
Q2 will switch switching to corresponding branch according to maximum value, and the value that respective branches export then is sent to decision device h, if
This value is greater than 0, then adjudicates output " 0 "；Otherwise " 1 " is exported.
The present invention improves data transmission rate by the way that the information bit of fractional transmission to be mapped in the selection of Walsh code,
Bandwidth is increased, while having saved energy consumption.Within a period of transmission, existing DCSK system can only transmit 1 bit information, this hair
It is bright other than transmitting this bit information, be mapped in the selection of Walsh code subscript value by code subscript modulation bit, Ke Yiduo
Transmit several bit informations.In at the same time, the information bit that the present invention is transmitted is than mostly several times of existing DCSK, i.e. this hair
Bright bandwidth greatly improves data transmission rate than mostly several times of existing DCSK.Pass through every bit of DCSK modulation transmission simultaneously
Information requires energy, and in same period, the present invention and existing DCSK pass through 1 bit information of DCSK modulation transmissions, the two
As many, but the present invention transmits several bit informations to the energy of consuming more than existing DCSK, if having saved the energy of kilo byte
Amount, improves energy efficiency, has saved energy.Therefore the present invention has more in terms of increasing bandwidth and energy saving than existing DCSK
It is competitive.
Detailed description of the invention
Fig. 1 is the composed structure for the DCSK modulator modulated based on code subscript；
Fig. 2 is the composed structure for the DCSK demodulator modulated based on code subscript；
Fig. 3 is the detailed process for the DCSK modulation modulated based on code subscript；
Fig. 4 is the detailed process for the DCSK demodulation modulated based on code subscript；
Fig. 5 is under additive white Gaussian noise (AWGN) channel, code subscript modulate DCSK and routine DCSK in different CIM values and
Performance of BER under different spreading factors compares；
Fig. 6 is under multipath Rayleigh (Rayleigh) fading channel, and code subscript modulates DCSK from routine DCSK in different CIM values
Compare with the performance of BER under different spreading factors.
Specific embodiment
Fig. 1 show the composed structure of the DCSK modulator based on the modulation of code subscript.The every frame packet of bit stream of system transmission
It includes yard subscript modulation mapped bits stream and DCSK modulation bit, every frame bit stream is expressed asWherein
Bit streamMapped bits stream, bit b are modulated for code subscriptmFor DCSK modulation bit.Code subscript modulation mapping
Bit streamIt is mapped to a yard subscript modulation intelligence symbol aCIM, wherein aCIM∈ 1,2 ... and, M }, correspond to M rank
W in Walsh code1,W2,....,WM, 1 corresponds to W1, 2 correspond to W2, and so on, M corresponds to WM, therefore the modulation of code subscript is reflected
Penetrating bit stream can be used for the selection of Walsh code.DCSK modulation bit bmIt is mapped to DCSK modulation intelligence symbol, i.e. DCSK modulation ratio
Special " 0 " or " 1 " is mapped to DCSK modulation intelligence symbol " 1 " or " -1 " respectively.
Modulation implement body modulated process is as follows: the chaotic carrier that chaotic carrier generator G is generated divides two-way to export, and believes all the way
It number is directly entered modulator switching switch Q1, in first half cycle, modulator switching switch Q1 is switched to c, output reference signal.Separately
Signal is sent into multiplier a, in the bit stream of transmission, every frame bit flow point after entering modulator delay unit D1 delay β all the way
For two parts, respectively code subscript modulates mapped bits streamWith DCSK modulation bit bm, code subscript, which is modulated, reflects
Penetrate bit streamIt is sent into after being mapped to corresponding code subscript modulation intelligence symbol to signal converter f into bit
Walsh code selector S, selects corresponding Walsh code i.e. Walsh code W1,W2,....,WMMiddle subscript value and the modulation of code subscript are believed
It exports after breath symbol is one corresponding, generated into square-wave generator e and enters after the signal of chaotic carrier signal equal length
Multiplier a, in multiplier a, the signal and the signal multiplication after delay of square-wave generator e generation, multiplied result are sent into multiplication
Device b, DCSK modulation bit bmMultiplication is sent into after being mapped to corresponding DCSK modulation intelligence symbol to signal converter g into bit
Device b, in multiplier b, DCSK modulation intelligence symbol is multiplied with the output of multiplier a, and multiplied result is sent into modulator switching and is opened
Q1 is closed, in the later half period, modulator switching switch Q1 is switched to d, output information modulated signal.
Such as the structure that Fig. 2 is the DCSK demodulator modulated based on code subscript, the specific implementation process of demodulator is as follows: receiving
The signal r that device R is receivedkAfter divide two-way to export, respectively enter corresponding multiplier M in M branch all the way2,1,M2,2,....,
M2,M, another way signal enters demodulator delay unit D2, respectively enters corresponding multiplier M in M branch after the β that is delayed1,1,
M1,2,....,M1,M.In branch 1, M rank Walsh code W1Into square-wave generator S1It generates and believes that isometric i.e. length is β's with carrier wave
It is exported after signal, into multiplier M1,1Multiplier M is sent into the result of the signal multiplication after delay, multiplication2,1, in multiplier
M2,1In, multiplier M1,1Output and first half cycle signal multiplication, the result of multiplication be sent into accumulator Ac1, accumulated result point
Two-way is respectively fed to demodulator switching switch Q2 node Z1With the device Ab that takes absolute value1, take absolute value device Ab1The result of output is sent
Enter comparator C.In branch 2, M rank Walsh code W2Into square-wave generator S2It generates and believes that isometric i.e. length is the letter of β with carrier wave
It is exported after number, into multiplier M1,2Multiplier M is sent into the result of the signal multiplication after delay, multiplication2,2, in multiplier M2,2
In, multiplier M1,2Output and first half cycle signal multiplication, the result of multiplication be sent into accumulator Ac2, accumulated result divides two-way
It is respectively fed to demodulator switching switch Q2 node Z2With the device Ab that takes absolute value2, take absolute value device Ab2The result of output is sent into ratio
Compared with device C.And so on, M branch completes above-mentioned processing, and the output of the shared M devices that take absolute value is sent into comparator C, is being compared
Compare the maximum value selected in M absolute value in device C and divides two-way to export after detecting corresponding Walsh code subscript value, one
Road enters symbol to bit converter k, and Walsh code subscript value is de-mapping to corresponding code subscript modulation mapped bits stream estimation
ValueAfter export.Another way signal enters demodulator switching switch Q2, and demodulator switches switch Q2 according to selection
After the corresponding branch of maximum selection rule out, the value that closure switching switch exports respective branch is sent into decision device h, if this
Value is greater than 0, then judgement is " 0 ", and otherwise judgement is " 1 ", and decision device h exports DCSK modulation bit estimated value
Embodiment
It is below to be based on Computer Simulation process, the implementation method that the present invention is further explained.If chaotic carrier by from
Scattered Logistic, which maps, to be generated, and the sample frequency of signal is set as fs=1000 times/second, the duration of bit are T=0.048
Second, then equivalent spreading factor is defined as β=T × fs=48.The Logistic mapping equation of chaotic carrier isK=0 ... .., i ... .., when given initial value, x (0), passes through iterative x (i+1)=1-2 × x2
(i), i=0 ..., i ..., β -1 can produce the chaotic carrier sequence that length is β (spreading factor β)M rank
Walsh code constructing method are as follows: Wm=[Wm-1,Wm-1；Wm-1,-Wm-1], W1=[+1 ,+1；+ 1, -1], wherein
Modulator completes modulation according to the chaotic carrier sequence generated above, by modulator as shown in Figure 1, in each symbol
It sends signal and can be indicated by following formula in number period are as follows:
Wherein EsIt is symbol energy, spreading factor SF=2 β, cxFor chaotic signal, meet
For DCSK modulation intelligence symbol, aCIM∈ 1 ... and, M } it is code subscript modulation intelligence symbol,
For the Walsh code of selection, M is Walsh code code length.θ is spread spectrum parameter, and when θ takes different value, spreading factor can change.
Modulated process is as follows: as k=1, DCSK modulation intelligence symbol amWith the Walsh code of selection'sIt is corresponding to be multiplied, phase
Multiply result respectively with θ corresponding chaotic carrier signal multiplications, θ value is generated, as first group of signal.When k=2, DCSK tune
Information symbol a processedmWith the Walsh code of selection'sCorresponding to be multiplied, the result of multiplication is carried with θ corresponding chaos respectively
Wave signal multiplication generates θ value, as second group of signal.And so on, M similar operations are completed, M group signal composition is generated
Length is the signal of β as information modulated signal, and wherein β meets β=M θ.
Fig. 3 shows the detailed process of the DCSK modulation based on the modulation of code subscript, c in figurexFor chaotic carrier signal, amFor
DCSK modulation intelligence symbol, wsThe Walsh code of mapping symbols selection, s are modulated for code subscriptkIndicate information modulated signal.Here
DCSK modulation intelligence symbol am1 is taken, the Walsh code w of selectionsSpread spectrum parameter θ value be 3, M take 16, i.e., by Walsh code wsIn
Each code element extends 3 and obtains the signal that length is β, and β meets β=M θ.Illustrate that the smallest slot unit represents is one and adopts
Sample signal, the smallest time slot are 0.001s.In first in slot unit, chaotic carrier signal cxIn corresponding value cx,1、DCSK
Modulation symbol amIn corresponding value am,1With Walsh code wsIn corresponding value ws,1,1Multiplication obtains information modulated signal skIn it is corresponding
Value sk,1.In second in slot unit, chaotic carrier signal cxIn corresponding value cx,2, DCSK modulation symbol amIn corresponding value am,2
With Walsh code wsIn corresponding value ws,1,2Multiplication obtains information modulated signal skIn corresponding value sk,2.And so on, by M
Similar operations obtain the signal modulation signal s containing β valuek。
In receiving end, demodulating process is as follows:
Following formula is called using demodulator as shown in Figure 2, the decision statistics for calculating the output of n-th of branch are as follows:
1 in above formulaθ×1=[1 ... .., 1]T, wn=[wn,1,.....,wn,N]T,It is kronecher product, ο is
Hadamard product.The reference information wherein received isModulation intelligence is It indicates for symbol each in Walsh code to be extended to θ identical symbols, generating with chaotic carrier signal length is all β
Walsh code character, this formula is meant that the Walsh code character after the reference information that will be received, extension and modulates information information
The signal value of corresponding time is multiplied, and the result of multiplication is cumulative to obtain decision statistics In.It is branch 1, Walsh code as n=1
For w1, the signal r that receiveskIn reference signal rrefWith Walsh code w1The code character of extension is multiplied, multiplied result and modulates information
Signal rinfIt is multiplied, the result of multiplication adds up, accumulated result I1.It is branch 2 as n=2, Walsh code is w2, connect
The signal r receivedkIn reference signal rrefWith Walsh code w2The code character of extension is multiplied, multiplied result and information modulated signal rinf
It is multiplied, the result of multiplication adds up, accumulated result I2.And so on, the decision statistic meter until completing M branch
It calculates.
Fig. 4 shows the detailed process of the DCSK demodulation based on the modulation of code subscript, r in figurerefFor reference signal, wnIt is n-th
The Walsh code of branch, rinfFor information modulated signal, InFor the statistical decision amount of the n-th branch.Here spread spectrum parameter θ value is 3,
M value is 16, i.e., by Walsh code wnMiddle each code element is extended to the signal that 3 identical symbols generate length β, and β meets β=M
θ.Illustrate the smallest slot unit representative is a sampled signal, and the smallest time slot is 0.001s.In the first slot unit,
Reference signal rrefIn corresponding value rref,1, Walsh code wnIn corresponding value wn,1,1With information modulated signal rinfIn value rinf,1
It is multiplied, obtains statistical decision amount InCorresponding value In,1.In second slot unit, reference signal rrefIn corresponding value rref,2、
Walsh code wnIn corresponding value wn,1,2With information modulated signal rinfIn value rinf,2It is multiplied, obtains statistical decision amount InIt is corresponding
Value In,2.And so on, by β similar operation, obtain statistical decision amount Inβ value, finally by this β value add up
To statistical decision amount In。
Demodulator calls following formula according to Fig.2, calculates symbol aCIMAnd amEstimator:
Code subscript modulation intelligence symbol a in above formulaCIMEstimatorTake absolute value for M decision statistics | In| in
The corresponding Walsh code subscript value of maximum value, calculate the estimator of Walsh code subscript valueAfterwards, by estimatorSolution
It is mapped to corresponding code subscript modulation mapped bits stream estimated valueThe a of DCSK modulation intelligence symbolmEstimation
AmountAccording to Walsh code subscript valueCorresponding decision statisticsIt is positive and negative to obtain, that is, work as decision statisticsIt is positive
When, estimatorFor " 1 ", corresponding DCSK modulation bit estimated valueFor " 0 ", work as decision statisticsWhen being negative, estimation
AmountFor " -1 ", corresponding DCSK modulation bit estimated valueFor " 1 ".
Difference shift keying modulation demodulation method based on the modulation of code subscript is missed at additive white Gaussian noise channel (AWGN)
Bit-rate performance is as shown in Figure 5.Performance of BER under multipath Rayleigh (Rayleigh) fading channel is as shown in Figure 6.Make
The performance of BER of conventional DCSK i.e. identical spreading factor and channel under the same conditions is given to compare, in figure.Figure
Middle CIM indicates that the bit number of code subscript modulation mapping, SF indicate spreading factor.As seen from Figure 5, as CIM=1, CIM-
DCSK and routine DCSK has comparable performance of BER, and with the increase of CIM, the BER performance ratio DCSK of CIM-DCSK is bright
It is aobvious to improve, as CIM=4, in BER=10-4, CIM-DCSK has significantly performance gain relative to conventional DCSK, about
4db.As seen from Figure 6, the BER slope having the same of CIM-DCSK and routine DCSK, with the increase of CIM, spread spectrum because
The increase of son, the curve of CIM-DCSK is relative to DCSK to the trend of left, the be up to gain of 3db shows with CIM
Increase, CIM-DCSK than conventional DCSK have better performance of BER.To sum up show yard subscript modulation DCSK than conventional
DCSK has more obvious performance advantage.
The information bit of transmission is mapped in the selection of Walsh code by the present invention, is improved the data transfer rate of transmission, is increased
Bandwidth reduces energy consumption, and error performance and routine under awgn channel and multipath Rayleigh fading channels
DCSK is quite or more preferable, is a kind of competitive modulation-demo-demodulation method in broadband data transmission (such as UWB) application.
Claims (1)
1. the difference chaotic shift keying modulation demodulating equipment based on the modulation of code subscript, it is characterised in that be equipped with modulator and demodulation
Device；
The modulator is equipped with chaotic carrier generator G, modulator delay unit D1, the first multiplier a, the second multiplier b, the
One bit is to signal converter f, the second bit to signal converter g, Walsh code selector S, square-wave generator e and modulator
Switch switch Q1；The chaotic carrier signal output end of the chaotic carrier generator G connects modulator switching switch Q1 and tune respectively
Device delay unit D1 processed；The input terminal of the first multiplier a of time delayed signal output termination of modulator delay unit D1, code subscript tune
Mapped bits stream processed connect the first bit to signal converter f input terminal and the second bit to signal converter g input terminal,
One bit is mapped to corresponding code subscript modulation intelligence symbol output termination Walsh code selector S input to signal converter f's
End, Walsh code selector S select M rank Walsh code W1,W2,....,WMIn corresponding Walsh code be followed by square-wave generator e's
Input terminal, square-wave generator e are exported after generating the signal isometric with chaotic carrier signal, are met the first multiplier a and prolong with modulator
The time delayed signal that Shi DanyuanD 1 is exported is multiplied, the input terminal of the second multiplier b of multiplied result output termination of the first multiplier a,
The input that is mapped to corresponding DCSK modulation intelligence symbol output termination second multiplier b of second bit to signal converter g
It holds and is multiplied with the output of the first multiplier a, the multiplied result output termination modulator of the second multiplier b switches switch Q1；
The demodulator includes D2, M receiver R, demodulator delay unit square-wave generator S1,S2,....,SM, M first
Road multiplier M1,1,M1,2,....,M1,M, M No. second multiplier M2,1,M2,2,....,M2,M, M accumulator Ac1,
Ac2,....,AcM, M takes absolute value device Ab1,Ab2,....,AbM, comparator C, demodulator switching switch Q2, decision device h and symbol
Number arrive bit converter k；By square-wave generator S1, multiplier M1,1, multiplier M2,1, accumulator Ac1With the device Ab that takes absolute value1String
Connection composition branch 1, square-wave generator S2With multiplier M1,2, multiplier M2,2, accumulator Ac2With the device Ab that takes absolute value2It is composed in series
Branch 2, and so on, square-wave generator SM, multiplier M1,M, multiplier M2,M, accumulator AcMWith the device Ab that takes absolute valueMSeries connection group
At branch M, M branch is formed altogether；The signal r that receiver R is receivedkAfter divide two-way to export, input respectively enters M points all the way
Corresponding multiplier M in branch2,1,M2,2,....,M2,M, into demodulator delay unit D2, demodulator delay is single for another way input
First D2 meets corresponding multiplier M in M branch respectively1,1,M1,2,....,M1,M, in M branch, M M rank Walsh code W1,
W2,....,WMRespectively enter corresponding M square-wave generator S1,S2,....,SMAfter export, respectively enter corresponding M multiplication
Device M1,1,M1,2,....,M1,MEnter corresponding multiplier M with the result of the signal multiplication after delay, multiplication2,1,M2,2,....,
M2,MCorresponding accumulator Ac is sent into the result of first half cycle signal multiplication, multiplication1,Ac2,....,AcMAfter export, respectively
It is sent into the node Z of corresponding demodulator switching switch Q21,Z2,....,ZMWith the corresponding device Ab that takes absolute value1,
Ab2,....,AbM, the take absolute value output of devices of M is sent into comparator C together, and comparator C detects the maximum in M output valve
Divide two-way to respectively enter symbol after value and its corresponding Walsh code subscript value and switch switch Q2 to bit converter k and demodulator,
Subscript value symbol de-maps are obtained a yard subscript modulation bit stream estimated value to bit converter k by symbol；Demodulator switching switch
Q2 will switch switching to corresponding branch according to maximum value, and the value that respective branches export then is sent to decision device h, if
This value is greater than 0, then adjudicates output " 0 "；Otherwise " 1 " is exported.
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| CN108880758A (en) * | 2018-07-25 | 2018-11-23 | 厦门大学 | The iterative receiver algorithm for design of difference chaotic bit weaving code modulation system |
| CN110278041B (en) * | 2019-06-17 | 2020-11-10 | 广东工业大学 | Differential chaos keying modulation and demodulation method, device and system and readable storage medium |
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