CN109257312A - A kind of demodulation method and device of differential Chaos Shift Keying ultra-wideband communication system - Google Patents
A kind of demodulation method and device of differential Chaos Shift Keying ultra-wideband communication system Download PDFInfo
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- CN109257312A CN109257312A CN201811312807.3A CN201811312807A CN109257312A CN 109257312 A CN109257312 A CN 109257312A CN 201811312807 A CN201811312807 A CN 201811312807A CN 109257312 A CN109257312 A CN 109257312A
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- H04L27/001—Modulated-carrier systems using chaotic signals
Abstract
The invention discloses a kind of demodulation methods of differential Chaos Shift Keying ultra-wideband communication system; after the modulated signal on the channel for receiving differential Chaos Shift Keying ultra-wideband communication system; any two row vector in M rank walsh code matrix can be obtained; and then judgment variables are calculated according to modulated signal, two row vectors and protection interval duration; finally according to judgment variables, demodulated signal is obtained.It can be seen that, this method is modulated modulated signal using two row vectors, and pass through square operation, Fourth-order moment operation, by in modulated signal most of energy and white Gaussian noise energy move at 0Hz, and subtract the energy of flip-flop, the purpose for eliminating narrowband interference is realized, error bit ability has been obviously improved.In addition, being acted on corresponding with the effect of the above method the present invention also provides a kind of demodulating equipment of differential Chaos Shift Keying ultra-wideband communication system.
Description
Technical field
The present invention relates to the communications field, in particular to the demodulation method of a kind of differential Chaos Shift Keying ultra-wideband communication system and
Device.
Background technique
Wireless communication technique is a crucial role in the course of communications field development.As people want wireless communication
The continuous improvement asked, it would be desirable to obtain the communication service of high transfer rate whenever and wherever possible.Under such requirement background, ultra wide band
(Ultra Wide Band, UWB) technology has obtained extensive concern.
Chaos wireless communication is one kind using chaotic signal as carrier wave, using the wireless communication system of digital modulation.Chaos
The generation circuit of signal is simple, and the signal has natural broader frequency spectrum characteristic, therefore is based on chaos digital modulation technique
Chaos wireless ultra-wideband wireless communication system receive more and more attention.Pass through in March, 2005
In IEEE802.15.4a standard, chaotic signal becomes one of optional waveform, and subsequent Su Khiong Yong et al. proposes difference
Divide chaos shift keying ultra wide band (Differential Chaos Shift Keying-Ultra Wide Band, abbreviation DCSK-
UWB) communication system, and the performance for having carried out system to DCSK-UWB communication system is assessed, it was confirmed that and the system exists
Strong robustness in multipath channel, has a good application prospect.
Auto-correlation demodulation is the existing demodulation method for being widely used in DCSK-UWB communication system, still, is actually being answered
In, the frequency spectrum of the signal of DCSK-UWB communication system inevitably covers the occupied spectrum region of existing narrowband systems
Domain.These existing narrowband systems can cause serious interference to DCSK-UWB communication system, and it is dry that this interference is referred to as narrowband
It disturbs.In the presence of narrowband interferes, the performance of BER degradation of existing auto-correlation demodulation method, or even when letter
When number noise power ratio (signal-to-interference power ratio, SIR) is smaller, even if constantly increasing bit letter
It makes an uproar and compares, the DCSK-UWB communications system demodulation method performance of BER based on auto-correlation computation is still unable to get improvement.Cause
Performance of BER, narrowband jamming performance, the robustness of this prior art be not strong.
Summary of the invention
The object of the present invention is to provide the demodulation method and device of a kind of differential Chaos Shift Keying ultra-wideband communication system, to
The demodulation method error bit ability for solving existing differential Chaos Shift Keying ultra-wideband communication system caused by being interfered by narrowband is lower
The problem of.
In order to solve the above technical problems, the present invention provides a kind of demodulation sides of differential Chaos Shift Keying ultra-wideband communication system
Method, comprising:
Receive the modulated signal on the channel of differential Chaos Shift Keying ultra-wideband communication system；
Obtain the second row vector of the first row vector sum in M rank walsh code matrix, wherein the integral number power that M is 2, it is described
Second row vector described in the first row vector sum is any two row vector in the M rank walsh code matrix；
It is super according to the modulated signal, first row vector, second row vector and the differential Chaos Shift Keying
The protection interval duration of wide-band communication system, is calculated judgment variables, wherein the calculation formula of the judgment variables is such as
Under:
Judgment variables Z=Q1-Q0, wherein y1(t)=r1 2(t), Wherein r (t) is the modulated signal, TdFor the guarantor
Interval duration is protected, i is 0 to the integer between M-1, and first row vector is the row k of M rank walsh code matrix, described
Second row vector is the jth row of M rank walsh code matrix, and k and j are 1 to the positive integer between M, and k is not equal to j, wk,N-iFor
The N-i parameter of first row vector, wj,N-iFor the N-i parameter of second row vector；
According to the discrimination variable, demodulated signal is obtained.
Optionally, second row vector of the first row vector sum obtained in M rank walsh code matrix, comprising:
Obtain second order walsh code matrix in the second row vector of the first row vector sum, wherein first row vector for (+
1 ,+1), second row vector is (+1, -1).
Optionally, described according to the discrimination variable, obtain demodulated signal, comprising:
Judge the size relation of the judgment variables Yu 0；
If the discrimination variable is greater than 0, demodulated signal+1 is obtained；
If the judgment variables obtain demodulated signal -1 less than 0.
Correspondingly, the present invention also provides a kind of demodulating equipments of differential Chaos Shift Keying ultra-wideband communication system, comprising:
Signal receiving module: the modulated signal on channel for receiving differential Chaos Shift Keying ultra-wideband communication system；
Row vector obtains module: obtaining the second row vector of the first row vector sum in M rank walsh code matrix, wherein M 2
Integral number power, the second row vector described in the first row vector sum be in the M rank walsh code matrix any two row to
Amount；
Judgment variables computing module: for according to the modulated signal, first row vector, second row vector,
And the protection interval duration of the differential Chaos Shift Keying ultra-wideband communication system, judgment variables are calculated, wherein institute
The calculation formula for stating judgment variables is as follows:
Judgment variables Z=Q1-Q0, wherein y1(t)=r1 2(t), Wherein r (t) is the modulated signal, TdFor the guarantor
Interval duration is protected, i is 0 to the integer between M-1, and first row vector is the row k of M rank walsh code matrix, described
Second row vector is the jth row of M rank walsh code matrix, and k and j are 1 to the positive integer between M, and k is not equal to j, wk,N-iFor
The N-i parameter of first row vector, wj,N-iFor the N-i parameter of second row vector；
Demodulated signal obtains module: for obtaining demodulated signal according to the discrimination variable.
Optionally, the row vector obtains module and is specifically used for: obtaining the first row vector sum in second order walsh code matrix
Second row vector, wherein first row vector is (+1 ,+1), and second row vector is (+1, -1).
Optionally, the demodulated signal obtains module and includes:
Judging unit: for judging the size relation of the judgment variables Yu 0；
First result unit: for obtaining demodulated signal+1 when the judgment variables are greater than 0；
Second result unit: for obtaining demodulated signal -1 when the difference is less than 0.
To sum up, the demodulation method of a kind of differential Chaos Shift Keying ultra-wideband communication system provided by the present invention, is receiving
After modulated signal on the channel of differential Chaos Shift Keying ultra-wideband communication system, any two in M rank walsh code matrix can be obtained
Row vector, and then judgment variables are calculated according to modulated signal, two row vectors and protection interval duration, finally
According to judgment variables, demodulated signal is obtained.As it can be seen that this method is modulated modulated signal using two row vectors, and pass through
Square operation, Fourth-order moment operation, by modulated signal most of energy and white Gaussian noise energy move at 0Hz, and subtract
The energy for going flip-flop realizes the purpose for eliminating narrowband interference, has been obviously improved error bit ability.
In addition, the present invention also provides a kind of demodulating equipment of differential Chaos Shift Keying ultra-wideband communication system, effect with
The effect of the above method is corresponding, and which is not described herein again.
Detailed description of the invention
It, below will be to embodiment or existing for the clearer technical solution for illustrating the embodiment of the present invention or the prior art
Attached drawing needed in technical description is briefly described, it should be apparent that, the accompanying drawings in the following description is only this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the spectrum distribution schematic diagram of UWB system and existing narrowband systems；
Fig. 2 is the modulator principle schematic diagram of differential Chaos Shift Keying ultra-wideband communication system；
Fig. 3 is that the modulator of differential Chaos Shift Keying ultra-wideband communication system emits the waveform diagram of signal；
Fig. 4 is the demodulator principle signal in differential Chaos Shift Keying ultra-wideband communication system based on auto-correlation computation method
Figure；
Fig. 5 is a kind of demodulation method embodiment one of differential Chaos Shift Keying ultra-wideband communication system provided by the present invention
Implementation flow chart；
Fig. 6 is a kind of demodulation method embodiment two of differential Chaos Shift Keying ultra-wideband communication system provided by the present invention
Demodulator schematic illustration；
Fig. 7 is embodiment provided by the present invention two and the performance curve comparison of the demodulation method based on auto-correlation computation the
One schematic diagram；
Fig. 8 is embodiment provided by the present invention two and the performance curve comparison of the demodulation method based on auto-correlation computation the
Two schematic diagrames；
Fig. 9 is embodiment provided by the present invention two and the performance curve comparison of the demodulation method based on auto-correlation computation the
Three schematic diagrames；
Figure 10 is a kind of demodulating equipment embodiment of differential Chaos Shift Keying ultra-wideband communication system provided by the present invention
Functional block diagram.
Specific embodiment
Core of the invention is to provide the demodulation method and device of a kind of differential Chaos Shift Keying ultra-wideband communication system, realizes
The purpose for eliminating narrowband interference, significantly improves error bit ability.
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.Obviously, described embodiments are only a part of the embodiments of the present invention, rather than
Whole embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, shall fall within the protection scope of the present invention.
Before introducing the embodiment of the present invention, technical background is briefly introduced first:
On 2 14th, 2002, Federal Communications Commission (Federal Communications Commission,
FCC) agree to that UWB technology is used for commercial signal communication system, the approved frequency range of UWB signal is 3.1-10.6GHz.It covers existing
Some global positioning systems (Global Positioning System, GPS), Bluetooth communication system and WLAN
The frequency range of (Wireless Local Area Networks, WLAN) etc..In order to avoid the normal communication to existing system causes
The power spectral density of interference, FCC limitation UWB must not be higher than -41.3dBm/MHz.UWB signal and the frequency spectrum of existing narrowband systems account for
It is as shown in Figure 1 with situation.
DCSK-UWB communication system architecture is made of modulator and demodulator two parts, wherein modulator structure such as Fig. 2 institute
Show, the waveform for emitting signal is as shown in Figure 3.Wherein, TpFor Chaotic-Pulse signal duration, TdFor protection interval duration,
The information of transmission is "+1 " or " -1 ".Transmitting signal s (t) can be represented as:
Wherein, EbIt is each average energy for sending bit, b is the information sent, and b ∈ [- 1 ,+1], c (t) are chaos arteries and veins
Signal is rushed, for the present embodiment by taking Logistic Chaotic-Pulse signal as an example, Logistic chaotic signal has uniform probability density
With ideal correlation properties, mapping can be indicated are as follows:
The present embodiment can select American Institute of Electrical and Electronics Engineers (Institute of Electrical and
Electronics Engineers, IEEE) 802.15.4a tapped delay line model as channel model, the impulse of the channel
Response can indicate are as follows:
Wherein, α l and τ l is the gain and delay of the l articles diameter respectively.Pass through the reception signal of demodulator after channel are as follows:
R (t)=s (t) h (t)+n (t) (4)
Wherein,Indicate convolution operation.N (t) is additive white Gaussian noise (the Additive White that variance is N0/2
Gaussian Noise, AWGN).
DCSK-UWB communication system is the one kind of transmission with reference to (Transmitted Reference, TR) UWB system, with
TR-UWB is identical, sends correlation of the information MAP between reference segment and data segment, and send in a bit information
In reference segment and data segment may be considered in same channel circumstance, therefore auto-correlation demodulation method is widely applied
In DCSK-UWB communication system demodulating process (Li Bo chaos Ultra-wideband Communication Technology research [D] Nanjing Aero-Space University,
2007)。
Auto-correlation demodulation is the existing demodulation method for being widely used in DCSK-UWB communication system, the corresponding solution of this method
Adjust device structure as shown in Figure 4.Upon power-up of the system, modulator will be modulated the information of transmission, be modulated by modulator
Transmitting signal s (t) (representation method of s (t) is shown in formula (1)) after channel become demodulator reception signal r (t) (r (t)
Representation method see formula (4)).Then, demodulator is obtained to signal is received and it postpones the progress correlation intergal operation of the signal after Td
To judgment variables Z, which be may be expressed as:
Decision rule are as follows: Z is greater than 0, then the information restored is "+1 ", if the information that Z less than 0, is restored is " -1 ".
As shown in Figure 1, the frequency spectrum of the signal of DCSK-UWB communication system inevitably covers in practical applications
Some occupied spectral regions of narrowband systems.These existing narrowband systems can cause DCSK-UWB communication system serious
Interference, this interference are referred to as narrowband interference.In the presence of narrowband interferes, the mistake ratio of existing auto-correlation demodulation method
Special rate performance degradation, or even work as signal interference power ratio (signal-to-interference power ratio, SIR)
When smaller, even if constantly increasing bit signal-to-noise ratio, the DCSK-UWB communications system demodulation method errored bit based on auto-correlation computation
Rate performance is still unable to get improvement.Therefore the performance of BER of the prior art, narrowband jamming performance, robustness be not strong.
In order to improve the bit error rate of the existing DCSK-UWB communication system using the demodulation method based on auto-correlation computation
Performance, present aspect propose a kind of demodulation method of differential Chaos Shift Keying ultra-wideband communication system, DCSK- involved in this method
UWB communication system modulator is consistent in institute's existing method.
Below to a kind of demodulation method embodiment one of differential Chaos Shift Keying ultra-wideband communication system provided by the invention into
Row is introduced, and referring to Fig. 1, embodiment one includes:
Step S100: the modulated signal on the channel of differential Chaos Shift Keying ultra-wideband communication system is received.
Step S101: the second row vector of the first row vector sum in M rank walsh code matrix is obtained, wherein the integer that M is 2
Power, the second row vector described in the first row vector sum are any two row vector in the M rank walsh code matrix.
Step S102: according to the modulated signal, first row vector, second row vector and the difference
The protection interval duration of chaos shift keying ultra-wideband communication system, is calculated judgment variables.
Wherein, the calculation formula of the judgment variables is as follows: judgment variables Z=Q1-Q0.Wherein,y1
(t)=r1 2(t),Wherein r (t)
For the modulated signal, TdFor the protection interval duration, i is 0 to the integer between M-1, and first row vector is M
The row k of rank walsh code matrix, second row vector are the jth row of M rank walsh code matrix, and k and j are 1 between M
Positive integer, and k is not equal to j, wk,N-iFor the N-i parameter of first row vector, wj,N-iIt is the of second row vector
N-i parameter.
Step S103: according to the discrimination variable, demodulated signal is obtained.
As it can be seen that the present embodiment provides a kind of demodulation method of differential Chaos Shift Keying ultra-wideband communication system, receiving
After modulated signal on the channel of differential Chaos Shift Keying ultra-wideband communication system, any two in M rank walsh code matrix can be obtained
Row vector, and then judgment variables are calculated according to modulated signal, two row vectors and protection interval duration, finally
According to judgment variables, demodulated signal is obtained.As it can be seen that this method is modulated modulated signal using two row vectors, and pass through
Square operation, Fourth-order moment operation, by modulated signal most of energy and white Gaussian noise energy move at 0Hz, and subtract
The energy for going flip-flop realizes the purpose for eliminating narrowband interference, has been obviously improved error bit ability.
Start that a kind of demodulation method of differential Chaos Shift Keying ultra-wideband communication system provided by the invention is discussed in detail below
Embodiment two, the row vector that embodiment one is chosen are any two row vector in M rank walsh code matrix, and embodiment two is directed to
The implementation process for choosing two row vectors in 2 rank walsh code matrixes is illustrated, demodulator structure corresponding to the present embodiment
As shown in Figure 6.
Upon power-up of the system, modulator will be modulated the information of transmission, transmitting signal s (the t) (modulation modulated
Method has been introduced in technical background, and the representation method of s (t) is shown in formula (1)) become the solution based on quadravalence Moment Methods after channel
Adjust the reception signal r (t) of device (representation method of r (t) is shown in formula (4)).Demodulating process the following steps are included:
Step S200: determining and receive signal r (t), obtain the second row of the first row vector sum in 2 rank walsh code matrixes to
Amount, wherein first row vector is [+1, -1], and second row vector is [+1, -1].
Step S201: signal r (t) will be received respectively with row vector [+1, -1], [+1, -1] is multiplied and is added, obtain r1
(t) and r0(t).The process calculation formula is as follows:
r1(t)=r (t)+r (t-Td) (6)
r0(t)=r (t)-r (t-Td) (7)
Step S202: by signal r obtained in the first step1(t) and r0(t) square operation is carried out respectively, obtains y1(t)
And y0(t).The process calculation formula is as follows:
y1(t)=r1 2(t) (8)
Step S203: by the y in second step1(t) and y0(t) operation accordingly based on Fourth-order moment is carried out respectively.Obtain Q1
And Q0.The process calculation formula is as follows:
Step S204: Q is utilized1And Q0Judgment variables Z is obtained, the process calculation formula is as follows:
Z=Q1-Q0 (12)
Step S205: demodulated signal is obtained according to Z.
Specifically, decision rule are as follows: if Z is greater than 0, the information restored is "+1 ", if the letter that Z less than 0, is restored
Breath is " -1 ".
In order to prove the implementation result of the present embodiment, the present invention also provides emulation experiments, below to the mistake of emulation experiment
Journey and result are illustrated:
Firstly, by system parameter setting are as follows: Chaotic-Pulse width Tp=0.3ns, delay time Td=150ns.Channel model
For awgn channel and IEEE 802.15.4a CM1 channel.Differential Chaos Shift Keying ultra-wideband communication system under awgn channel
The errored bit of demodulation method embodiment two and the DCSK-UWB communications system demodulation method (existing method) based on auto-correlation computation
Rate performance curve is as shown in Figure 7.As shown in Figure 7, embodiment two is better than the DCSK- based on auto-correlation computation under awgn channel
UWB communications system demodulation method.When bit error rate=1 × 10-4When, embodiment two is than the DCSK-UWB based on auto-correlation computation
Communications system demodulation method well about 5dB.Similarly, as shown in Figure 8, under CM1 channel, the performance of embodiment two with based on from phase
The performance trend for closing the DCSK-UWB communications system demodulation method of operation is similar, when bit error rate=1 × 10-4When, implement
The about 2dB well than the DCSK-UWB communications system demodulation method based on auto-correlation computation of example two.
There are when narrowband interference under CM1 channel, embodiment two and the DCSK-UWB communication system based on auto-correlation computation
The performance curve of demodulation method is as shown in Figure 9.As shown in Figure 9, in the case where SIR=0dB, based on auto-correlation computation
The performance of BER of DCSK-UWB communications system demodulation method is not improved with the raising of bit signal-to-noise ratio, and embodiment
Two performance of BER has apparent improvement with the raising of bit signal-to-noise ratio.In the case where SIR=5dB, when mistake ratio
Special rate=1 × 10-3When, the about 3dB well than the DCSK-UWB communications system demodulation method based on auto-correlation computation of embodiment two.
In conclusion performance of BER emulation experiment illustrates: in awgn channel, CM1 channel and under CM1 channel
There are when narrowband interference, a kind of demodulation method embodiment two of differential Chaos Shift Keying ultra-wideband communication system provided by the invention compares
DCSK-UWB communications system demodulation method error bit ability performance based on auto-correlation computation is more excellent, and has stronger
Anti- narrowband interference performance, robustness are stronger.
In conclusion compared with the DCSK-UWB communications system demodulation method in the prior art based on auto-correlation computation, this
A kind of demodulation method for differential Chaos Shift Keying ultra-wideband communication system that embodiment provides has more excellent errored bit forthright
Energy and stronger anti-narrowband interference performance, therefore embodiment two has stronger robustness.
It is noted that this emulation experiment only verifies embodiment two, the master of embodiment one and embodiment two
The difference for being the row vector chosen is distinguished, the two realizes that the principle for eliminating narrowband interference is identical, theoretically embodiment one
Experimental result is corresponding with the test result of embodiment two, no longer opens up here to the emulation experiment and its result of embodiment one
Open introduction.
Below to a kind of demodulating equipment progress of differential Chaos Shift Keying ultra-wideband communication system provided in an embodiment of the present invention
It introduces, a kind of demodulating equipment of differential Chaos Shift Keying ultra-wideband communication system described below and a kind of above-described difference are mixed
The demodulation method of ignorant keyed ultra wideband communication system can correspond to each other reference.
As shown in Figure 10, which includes:
Signal receiving module 100: the modulated signal on channel for receiving differential Chaos Shift Keying ultra-wideband communication system.
Row vector obtains module 200: obtaining the second row vector of the first row vector sum in M rank walsh code matrix, wherein M
For 2 integral number power, the second row vector described in the first row vector sum is any two row in the M rank walsh code matrix
Vector.
Judgment variables computing module 300: for according to the modulated signal, first row vector, second row to
The protection interval duration of amount and the differential Chaos Shift Keying ultra-wideband communication system, is calculated judgment variables.
Wherein, the calculation formula of the judgment variables is as follows: judgment variables Z=Q1-Q0, whereiny1
(t)=r1 2(t),Wherein r (t)
For the modulated signal, TdFor the protection interval duration, i is 0 to the integer between M-1, and first row vector is M
The row k of rank walsh code matrix, second row vector are the jth row of M rank walsh code matrix, and k and j are 1 between M
Positive integer, and k is not equal to j, wk,N-iFor the N-i parameter of first row vector, wj,N-iIt is the of second row vector
N-i parameter.
Demodulated signal obtains module 400: for obtaining demodulated signal according to the discrimination variable.
As an implementation, the row vector obtains module 200 and is specifically used for: obtaining in second order walsh code matrix
The second row vector of the first row vector sum, wherein first row vector be (+1 ,+1), second row vector be (+1 ,-
1)。
As an implementation, the demodulated signal obtains module 400 and includes:
Judging unit: for judging the size relation of the judgment variables Yu 0；
First result unit: for obtaining demodulated signal+1 when the judgment variables are greater than 0；
Second result unit: for obtaining demodulated signal -1 when the difference is less than 0.
A kind of demodulating equipment of differential Chaos Shift Keying ultra-wideband communication system of the present embodiment is for realizing one kind above-mentioned
The demodulation method of differential Chaos Shift Keying ultra-wideband communication system, therefore visible one hereinbefore of specific embodiment in the device
The embodiment part of the demodulation method of kind of differential Chaos Shift Keying ultra-wideband communication system, for example, signal receiving module 100, row to
Amount obtains module 200, judgment variables computing module 300, demodulated signal and obtains module 400, is respectively used to realize a kind of above-mentioned difference
Divide step S100, S101, S102, S103 in the demodulation method of chaos shift keying ultra-wideband communication system.So specific embodiment party
Formula is referred to the description of corresponding various pieces embodiment, herein not reinflated introduction.
In addition, due to the present embodiment a kind of differential Chaos Shift Keying ultra-wideband communication system demodulating equipment for realizing preceding
A kind of demodulation method for the differential Chaos Shift Keying ultra-wideband communication system stated, therefore its effect is opposite with the effect of the above method
It answers, which is not described herein again.
Each embodiment in this specification is described in a progressive manner, the highlights of each of the examples are with it is other
The difference of embodiment, same or similar part may refer to each other between each embodiment.For being filled disclosed in embodiment
For setting, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part
Explanation.
Professional further appreciates that, unit described in conjunction with the examples disclosed in the embodiments of the present disclosure
And algorithm steps, can be realized with electronic hardware, computer software, or a combination of the two, in order to clearly demonstrate hardware and
The interchangeability of software generally describes each exemplary composition and step according to function in the above description.These
Function is implemented in hardware or software actually, the specific application and design constraint depending on technical solution.Profession
Technical staff can use different methods to achieve the described function each specific application, but this realization is not answered
Think beyond the scope of this invention.
The step of method described in conjunction with the examples disclosed in this document or algorithm, can directly be held with hardware, processor
The combination of capable software module or the two is implemented.Software module can be placed in random access memory (RAM), memory, read-only deposit
Reservoir (ROM), electrically programmable ROM, electrically erasable ROM, register, hard disk, moveable magnetic disc, CD-ROM or technology
In any other form of storage medium well known in field.
Above the demodulation method to a kind of differential Chaos Shift Keying ultra-wideband communication system provided by the present invention and device into
It has gone and has been discussed in detail.Used herein a specific example illustrates the principle and implementation of the invention, the above implementation
The explanation of example is merely used to help understand method and its core concept of the invention.It should be pointed out that for the general of the art
, without departing from the principle of the present invention, can be with several improvements and modifications are made to the present invention for logical technical staff, this
A little improvement and modification are also fallen within the protection scope of the claims of the present invention.
Claims (6)
1. a kind of demodulation method of differential Chaos Shift Keying ultra-wideband communication system characterized by comprising
Receive the modulated signal on the channel of differential Chaos Shift Keying ultra-wideband communication system；
Obtain the second row vector of the first row vector sum in M rank walsh code matrix, wherein the integral number power that M is 2, described first
Row vector and second row vector are any two row vector in the M rank walsh code matrix；
According to the modulated signal, first row vector, second row vector and the differential Chaos Shift Keying ultra wide band
The protection interval duration of communication system, is calculated judgment variables, wherein the calculation formula of the judgment variables is as follows:
Judgment variables Z=Q1-Q0, wherein y1(t)=r1 2(t), Wherein r (t) is the modulated signal, TdFor the guarantor
Interval duration is protected, i is 0 to the integer between M-1, and first row vector is the row k of M rank walsh code matrix, described
Second row vector is the jth row of M rank walsh code matrix, and k and j are 1 to the positive integer between M, and k is not equal to j, wk,N-iFor
The N-i parameter of first row vector, wj,N-iFor the N-i parameter of second row vector；
According to the discrimination variable, demodulated signal is obtained.
2. the method as described in claim 1, which is characterized in that the first row vector sum obtained in M rank walsh code matrix
Second row vector, comprising:
Obtain second order walsh code matrix in the second row vector of the first row vector sum, wherein first row vector for (+1 ,+
1), second row vector is (+1, -1).
3. method according to claim 2, which is characterized in that described to obtain demodulated signal according to the discrimination variable, packet
It includes:
Judge the size relation of the judgment variables Yu 0；
If the discrimination variable is greater than 0, demodulated signal+1 is obtained；
If the judgment variables obtain demodulated signal -1 less than 0.
4. a kind of demodulating equipment of differential Chaos Shift Keying ultra-wideband communication system characterized by comprising
Signal receiving module: the modulated signal on channel for receiving differential Chaos Shift Keying ultra-wideband communication system；
Row vector obtain module: obtain M rank walsh code matrix in the second row vector of the first row vector sum, wherein M for 2 it is whole
Power for several times, the second row vector described in the first row vector sum are any two row vector in the M rank walsh code matrix；
Judgment variables computing module: for according to the modulated signal, first row vector, second row vector and
The protection interval duration of the differential Chaos Shift Keying ultra-wideband communication system, is calculated judgment variables, wherein described to sentence
Certainly the calculation formula of variable is as follows:
Judgment variables Z=Q1-Q0, wherein y1(t)=r1 2(t), Wherein r (t) is the modulated signal, TdFor the guarantor
Interval duration is protected, i is 0 to the integer between M-1, and first row vector is the row k of M rank walsh code matrix, described
Second row vector is the jth row of M rank walsh code matrix, and k and j are 1 to the positive integer between M, and k is not equal to j, wk,N-iFor
The N-i parameter of first row vector, wj,N-iFor the N-i parameter of second row vector；
Demodulated signal obtains module: for obtaining demodulated signal according to the discrimination variable.
5. device as claimed in claim 4, which is characterized in that the row vector obtains module and is specifically used for: obtaining second order
The second row vector of the first row vector sum in walsh code matrix, wherein first row vector is (+1 ,+1), second row
Vector is (+1, -1).
6. device as claimed in claim 5, which is characterized in that the demodulated signal obtains module and includes:
Judging unit: for judging the size relation of the judgment variables Yu 0；
First result unit: for obtaining demodulated signal+1 when the judgment variables are greater than 0；
Second result unit: for obtaining demodulated signal -1 when the difference is less than 0.
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