CN102611670B - Transform domain communication system and realization method thereof - Google Patents
Transform domain communication system and realization method thereof Download PDFInfo
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Abstract
The invention discloses a transform domain communication system and a realization method thereof; a transmitting terminal specially comprises a first random phase spectrum sequence generation module, a first random phase spectrum sequence distribution module, a modulation module and a branch signal superposition module. According to the system and the method, all idle spectrums of a spectrum sensing output end are reasonably distributed according to the number of appropriate spectrum cluster in the design selection parameters of the system by integrating the technical characteristics of cyclic code shift keying (CCSK) modulation and the condition of the strict orthogonality between the idle spectrums; after spectrum distribution, different spectrum clusters generate corresponding basic modulation waveforms after fourier inverse transform to form different branches; different branches respectively are carried out CCSK modulation according to the input data, and finally the branch signals are superposed and sent together; and different data is respectively transmitted through the distributed different spectrum clusters, so that the data transmission rate of the transform domain communication system is improved, and the spectrum utilization rate of the system is improved.
Description
Technical field
The invention belongs to communication technical field, relate in particular to a kind of transform domain communication system and its implementation.
Background technology
At transform domain communication system (Transform Domain Communication System, TDCS) in, in order to make full use of idle frequency spectrum resource, TDCS system is decomposed into a series of separate spectrum idle frequency range, in conjunction with random phase generation module, produce the basic modulation waveform of TDCS system, generate final transmitted signal by circumference circular modulating (Circular Cyclic Shift Keying, CCSK).By the way, transmitted signal has the statistical property that is similar to noise, therefore has lower detection probability (mainly for unauthorized user).The shortcoming of this scheme is: the circumference cycle offset that existing TDCS system is modulated by CCSK represents the data of transmission, for example CCSK modulation has the different side-play amount numerical value of M kind, and the maximum information bit number that the transmission symbol based on this modulation system can carry is log
2(M).Therefore the availability of frequency spectrum of the TDCS system based on CCSK modulation system is lower.Therefore in limited idle frequency range, TDCS system can not transferring large number of data, has limited its application scenarios in real system, at present only for low speed data transmission link.
Summary of the invention
The object of the invention is, in order to solve the low problem of existing TDCS system spectrum utilance, to have proposed a kind of transform domain communication system.
Technical scheme of the present invention is: a kind of transform domain communication system, and its transmitting terminal comprises the first random phase frequency spectrum sequence generation module for generating frequency spectrum random phasic serial signal,
It is characterized in that, transmitting terminal also comprises: the first random phase frequency spectrum sequence allocation module, modulation module and tributary signal laminating module, wherein,
The first described random phase frequency spectrum sequence allocation module is for according to the size of described transform domain communication system parameter intermediate frequency spectrum bunch, by random phase frequency spectrum sequence allocation to different spectral bunch for secured transmission of payload data, be divided into different branch roads by the idle frequency spectrum in random phase frequency spectrum sequence, and number of branches equals frequency spectrum number of clusters;
Described modulation module is used for the data of the corresponding branch road of modulating the first modulated random phase frequency spectrum sequence allocation module assignment;
Described tributary signal laminating module, for the waveform after different branch modulation is superposeed, is finally launched the waveform after stack.
Further, the receiving terminal of described transform domain communication system comprises: the second random phase frequency spectrum sequence generation module, signal conjugate module, the second random phase frequency spectrum sequence allocation module, Fourier transform module, the module that multiplies each other and demodulation module, wherein,
The second described random phase frequency spectrum sequence generation module is used for generating frequency spectrum random phasic serial signal;
Described signal conjugate module carries out conjugate operation for the frequency spectrum random phasic serial signal that the second random phase frequency spectrum sequence generation module is generated;
The second described random phase frequency spectrum sequence allocation module is for according to the size of described transform domain communication system parameter intermediate frequency spectrum bunch, by random phase frequency spectrum sequence allocation to different spectral bunch for secured transmission of payload data, be divided into different branch roads by the idle frequency spectrum in random phase frequency spectrum sequence, and number of branches equals frequency spectrum number of clusters;
Described Fourier transform module is for carrying out Fourier transform to the signal that receives antenna reception;
The described module that multiplies each other is carried out respectively phase multiplication for the data of the corresponding branch road of the second modulated random phase frequency spectrum sequence allocation module assignment with the data of Fourier transform module output;
Described demodulation module is used for the output data of the module that multiplies each other of each branch road of demodulation, and the demodulating data obtaining is exported.
In order to address the above problem, the invention allows for a kind of implementation method of transform domain communication system, comprise the steps: at described transform domain communication system transmitting terminal
S110. according to the electromagnetic property of external environment condition, detect the spectrum signature of all spectral regions, the spectrum signature of gained is compared with the frequency spectrum thresholding presetting, generation is used for the frequency spectrum sequence of describing idle frequency spectrum and having taken frequency spectrum;
S120. utilize random sequence generator to produce random bit sequence, according to the phase mapping chart of described transform domain communication system, produce corresponding random phasic serial signal;
S130. the random phasic serial signal that frequency spectrum sequence step S110 being produced and step S120 produce carries out, by element multiplying, obtaining random phase frequency spectrum sequence;
S140. according to the number of transform domain communication system parameter intermediate frequency spectrum bunch, in the random phase frequency spectrum sequence that step S130 is obtained, idle frequency spectrum distributes, form different branch roads, concrete distribution principle is: the random phase frequency spectrum sequence in all frequency spectrums bunch takies all idle frequency spectrum resources jointly, and between different spectral bunch, do not take identical idle frequency spectrum resource, described number of branches equals frequency spectrum number of clusters;
S150. different branch random phase frequency spectrum sequence step S140 being obtained, modulates respectively;
The modulating data of each branch road S160. step S150 being obtained superposes, and finally the data after stack is launched.
Concrete, the detailed process of the modulation described in step S150 is as follows:
S1501. each tributary signal of step S140 output is passed through respectively to inverse Fourier transform, form multiple incoherent basic modulation waveforms.
S1502. the different branch of step S1501 being exported, according to different input data, utilizes CCSK modulation to carry out basic modulation waveform on every branch road of circumference circular modulating, obtains the signal waveform after modulation on each branch road.
Further, comprise the steps: at described transform domain communication system receiving terminal
S210. according to the electromagnetic property of external environment condition, detect the spectrum signature of all spectral regions, the spectrum signature of gained is compared with the frequency spectrum thresholding presetting, generation is used for the frequency spectrum sequence of describing idle frequency spectrum and having taken frequency spectrum;
S220. utilize random sequence generator to produce random bit sequence, according to the phase mapping chart of described transform domain communication system, produce corresponding random phasic serial signal;
S230. the random phasic serial signal that frequency spectrum sequence step S210 being produced and step S220 produce carries out, by element multiplying, obtaining random phase frequency spectrum sequence;
S240. according to the number of transform domain communication system parameter intermediate frequency spectrum bunch, in the random phase frequency spectrum sequence that step S230 is obtained, idle frequency spectrum distributes, and forms different branch roads.Concrete distribution principle is: the random phase frequency spectrum sequence in all frequency spectrums bunch takies all idle frequency spectrum resources jointly, and does not take identical idle frequency spectrum resource between different spectral bunch, and described number of branches equals frequency spectrum number of clusters;
S250. the reception signal of reception antenna being received carries out Fourier transform;
S260. the different branch frequency spectrum of step S240 output bunch is carried out to multiplying with the signal of step S250 output;
S270. the different branch signal of step S260 output is carried out respectively to demodulation, obtain demodulating data and export.
Concrete, the detailed process of the demodulation described in step S270 is as follows:
The output signal of the different branch S2701. step S260 being obtained is carried out inverse Fourier transform computing;
The output signal of the different branch S2702. step S2701 being obtained is extracted respectively real part;
The output signal of the different branch S2703. step S2702 being obtained is carried out peak value search, and the positional information of peak value is exported respectively as demodulating data.
Beneficial effect of the present invention: system and method for the present invention is by the condition of strict orthogonal between the technical characterstic in conjunction with CCSK modulation and idle frequency spectrum, select the number of frequency spectrum suitable in parameter bunch according to system, whole idle frequency spectrums of frequency spectrum perception output are carried out to reasonable distribution, wherein between different spectral bunch, meet orthogonality condition, and the whole idle frequency spectrum of all frequency spectrums bunch unity of possession.After frequency spectrum reasonable distribution, different spectral after mutually orthogonal distribution bunch produces corresponding basic modulation waveform through inverse Fourier transform respectively and forms different branch roads, different branch is carried out CCSK modulation according to input data respectively, is finally superimposed and sends.Can find out, the different spectral bunch after system and method utilization of the present invention distributes transmits respectively different data, has improved the data transmission rate of transform domain communication system, and then has improved system spectrum utilance.
Accompanying drawing explanation
Fig. 1 is transform domain communication system transmitting terminal system block diagram of the present invention.
Fig. 2 is transform domain communication system receiving terminal system block diagram of the present invention.
Fig. 3 is the implementation method transmitting terminal signal processing flow schematic diagram of transform domain communication system of the present invention.
Fig. 4 is the implementation method receiving end signal handling process schematic diagram of transform domain communication system of the present invention.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
Transform domain communication system of the present invention, the system block diagram of its transmitting terminal as shown in Figure 1, comprises the first random phase frequency spectrum sequence generation module for generating frequency spectrum random phasic serial signal,
Also comprise: the first random phase frequency spectrum sequence allocation module, modulation module and tributary signal laminating module, wherein,
The first described random phase frequency spectrum sequence allocation module is for according to the size of described transform domain communication system parameter intermediate frequency spectrum bunch, by random phase frequency spectrum sequence allocation to different spectral bunch for secured transmission of payload data, be divided into different branch roads by the idle frequency spectrum in random phase frequency spectrum sequence, and number of branches equals frequency spectrum number of clusters;
Described modulation module is used for the data of the corresponding branch road of modulating the first modulated random phase frequency spectrum sequence allocation module assignment; Can find out, the number of the modulation module of transmitting terminal equals number of branches.
Described tributary signal laminating module, for the waveform after different branch modulation is superposeed, is finally launched the waveform after stack.
The first random phase frequency spectrum sequence generation module here, comprises frequency spectrum perception submodule, frequency spectrum comparison sub-module, random sequence generation submodule, phase mapping device and random phasic serial signal maker, wherein,
Frequency spectrum perception submodule is for obtaining the power spectrum amplitude information on different frequency point according to external environment condition electromagnetic property;
Frequency spectrum comparison sub-module, for according to the sensing results of frequency spectrum sensing module, compares the power spectrum amplitude of different frequency point and the frequency spectrum thresholding presetting, and generates frequency spectrum sequence.
Concrete is relatively: large if sensing results ratio presets frequency spectrum thresholding, think to take frequency spectrum; Otherwise, think idle frequency spectrum.
Random sequence generation submodule, for generating random bit sequence;
Phase mapping device, produces corresponding random phasic serial signal for the random bit sequence generating according to random sequence generation module;
Random phasic serial signal maker, the random phasic serial signal that the frequency spectrum sequence generating according to frequency spectrum comparison module and phase mapping device produce, generates random phase frequency spectrum sequence.
For frequency spectrum perception submodule, if total bandwidth is W hertz in spectral regions, according to transform domain communication system parameter sub-carriers number N and subcarrier spacing Δ f, W=N Δ f, detection signal power spectrum amplitude on each subcarrier frequency.
In frequency spectrum comparison sub-module, to k frequency characteristic parameters of spectra A
k, when frequency power spectrum amplitude is greater than the frequency spectrum thresholding T presetting
threshold, setting this Frequency point numerical value was 0 (representing that this Frequency point takies); When power spectrum amplitude is less than or equal to the frequency spectrum thresholding T presetting
threshold, setting this Frequency point numerical value was 1 (representing this Frequency point free time), frequency spectrum comparison procedure can be described as:
By above-mentioned frequency spectrum perception and frequency spectrum comparison procedure, can obtain being used for describing external environment condition frequency use condition, i.e. A={A by the frequency spectrum sequence of numerical value 0,1 composition
0, A
1, A
2..., A
n-1.Suppose in frequency spectrum sequence A and have N
cindividual idle frequency spectrum, idle frequency spectrum set omega
cmeet { A
k=1, k ∈ Ω
c.
The modulation module here comprises inverse Fourier transform submodule and circumference circular modulating submodule, wherein,
The first inverse Fourier transform submodule carries out inverse Fourier transform for the different spectral sequence branch road that the first random phase frequency spectrum sequence allocation module is generated, and generates basic modulation waveform corresponding to frequency spectrum sequence branch road separately;
Circumference circular modulating submodule, carries out circumference circular modulating for the output basis modulation waveform to different branch the first inverse Fourier transform submodule.
As a preferred scheme, the receiving terminal system block diagram of transform domain communication system as shown in Figure 2, comprise: the second random phase frequency spectrum sequence generation module, signal conjugate module, the second random phase frequency spectrum sequence allocation module, Fourier transform module, the module that multiplies each other and demodulation module, wherein
The second described random phase frequency spectrum sequence generation module is used for generating frequency spectrum random phasic serial signal;
Described signal conjugate module carries out conjugate operation for the frequency spectrum random phasic serial signal that the second random phase frequency spectrum sequence generation module is generated;
The second described random phase frequency spectrum sequence allocation module is for according to the size of described transform domain communication system parameter intermediate frequency spectrum bunch, by random phase frequency spectrum sequence allocation to different spectral bunch for secured transmission of payload data, be divided into different branch roads by the idle frequency spectrum in random phase frequency spectrum sequence, and number of branches equals frequency spectrum number of clusters;
Described Fourier transform module is for carrying out Fourier transform to the signal that receives antenna reception;
The described module that multiplies each other is carried out respectively phase multiplication for the data of the corresponding branch road of the second modulated random phase frequency spectrum sequence allocation module assignment with the data of Fourier transform module output;
Described demodulation module is used for the output data of the module that multiplies each other of the each branch road of demodulation, and the demodulating data obtaining is exported.Can find out, the number of the demodulation module of receiving terminal and the module that multiplies each other equals number of branches.
The structure of the second random phase frequency spectrum sequence generation module is here identical with the structure of the first random phase frequency spectrum sequence generation module of transmitting terminal, no longer describes in detail.
The demodulation module here comprises the second inverse Fourier transform submodule, extracts real data submodule and peak value search submodule, wherein,
The second inverse Fourier transform submodule, carries out inverse Fourier transform for the output data of the module that multiplies each other to each branch road;
Extract real data submodule, for extracting the real data of inverse Fourier transform data of the second inverse Fourier transform submodule output;
Peak value is searched submodule, for the real data of extracting is carried out to peak value seek operations.
The invention allows for a kind of implementation method of transform domain communication system, wherein at described transform domain communication system transmitting terminal handling process schematic diagram as shown in Figure 3, specifically comprise the steps:
S110. according to the electromagnetic property of external environment condition, detect the spectrum signature of all spectral regions, the spectrum signature of gained is compared with the frequency spectrum thresholding presetting, generation is used for the frequency spectrum sequence A={ A that describes idle frequency spectrum and taken frequency spectrum
0, A
1, A
2..., A
n-1;
For frequency spectrum perception, if total bandwidth is W hertz in spectral regions, according to transform domain communication system parameter sub-carriers number N and subcarrier spacing Δ f, W=N Δ f.Frequency spectrum perception is detection signal power spectrum amplitude on each subcarrier frequency.
Frequency spectrum ratio in, to k frequency characteristic parameters of spectra A
k, when frequency power spectrum amplitude is greater than the frequency spectrum thresholding T presetting
threshold, setting this Frequency point numerical value was 0 (representing that this Frequency point takies); When power spectrum amplitude is less than or equal to the frequency spectrum thresholding T presetting
threshold, setting this Frequency point numerical value was 1 (representing this Frequency point free time), frequency spectrum comparison procedure can be described as:
By above-mentioned frequency spectrum perception and frequency spectrum comparison procedure, can obtain being used for describing external environment condition frequency use condition, i.e. A={A by the frequency spectrum sequence of numerical value 0,1 composition
0, A
1, A
2..., A
n-1.Suppose in frequency spectrum sequence A and have N
cindividual idle frequency spectrum, idle frequency spectrum set omega
cmeet { A
k=1, k ∈ Ω
c.
S120. utilize random sequence generator to produce random bit sequence, then, according to the phase mapping chart of described transform domain communication system, produce corresponding random phasic serial signal,
mi represents the phase place of i element of random phasic serial signal.
S130. the random phasic serial signal that frequency spectrum sequence A step S110 being produced and step S120 produce carries out, by element multiplying P, obtaining random phase frequency spectrum sequence; B=AP, obtains random phase frequency spectrum sequence
Random phase frequency spectrum sequence, mainly for generation of the waveform with noise characteristic, has low probability of intercept, and in access mode, distinguishes different users.
S140. according to the number L of transform domain communication system parameter intermediate frequency spectrum sequence cluster, the random phase frequency spectrum sequence allocation that step S130 is obtained is to L frequency spectrum bunch { A
1, A
2..., A
l, each frequency spectrum bunch occupies N
c/ L idle frequency spectrum, and each frequency spectrum bunch intermediate frequency spectrum sequence meets:
Wherein,
represent bunch corresponding idle frequency spectrum set of l frequency spectrum.
It should be noted that in order to make full use of idle frequency spectrum resource and to avoid the interference between different spectral bunch, all frequency spectrums bunch unity of possession idle frequency spectrum set omega
c, and can not share idle frequency spectrum between different spectral bunch,
After step S140, L the corresponding formation of frequency spectrum sequence cluster L bar branch road, and the frequency spectrum of different branch meets above-mentioned relation.
S150. by the L bar tributary signal random phase frequency spectrum sequence of step S140 output, modulate respectively, obtain signal waveform after the different modulation of L bar.
S160. the modulating data of the different branch of step S150 output is superposeed, finally the data after stack are launched.
Above-mentioned process of modulating is as follows:
S1501. the L bar tributary signal of step S140 output is passed through respectively to inverse Fourier transform, form L incoherent basic modulation waveform.
S1502. by the different branch of step S1501 output according to different input data, utilize CCSK modulation to carry out basic modulation waveform on every branch road of circumference circular modulating, therefore obtain signal waveform after the different modulation of L bar.
It should be noted that: the input data of each branch road can be understood as: corresponding different input data source; Also can be understood as: system only has an input data source, then according to the number of branch road, be decomposed into corresponding sub data flow, corresponding to the input of CCSK modulation in different branch, an input data source is decomposed into multichannel sub data flow and belongs to the ordinary skill in the art, be not described in detail.
As a preferred scheme, described transform domain communication system receiving terminal handling process schematic diagram as shown in Figure 4, comprises the steps:
S210. according to the electromagnetic property of external environment condition, detect the spectrum signature of all spectral regions, the spectrum signature of gained is compared with the frequency spectrum thresholding presetting, generation is used for the frequency spectrum sequence of describing idle frequency spectrum and having taken frequency spectrum;
For frequency spectrum perception, if total bandwidth is W hertz in spectral regions, according to transform domain communication system parameter sub-carriers number N and subcarrier spacing Δ f, W=N Δ f, detection signal power spectrum amplitude on each subcarrier frequency of frequency spectrum perception.
Frequency spectrum ratio in, to k frequency characteristic parameters of spectra A
k, when frequency power spectrum amplitude is greater than the frequency spectrum thresholding T presetting
threshold, setting this Frequency point numerical value was 0 (representing that this Frequency point takies); When power spectrum amplitude is less than or equal to the frequency spectrum thresholding T presetting
threshold, setting this Frequency point numerical value was 1 (representing this Frequency point free time), frequency spectrum comparison procedure can be described as
By above-mentioned frequency spectrum perception and frequency spectrum comparison procedure, can obtain being used for describing external environment condition frequency use condition, i.e. A={A by the frequency spectrum sequence of numerical value 0,1 composition
0, A
1, A
2..., A
n-1.Suppose in frequency spectrum sequence A and have N
cindividual idle frequency spectrum, idle frequency spectrum set omega
cmeet { A
k=1, k ∈ Ω
c.
S220. utilize random sequence generator to produce random bit sequence, then, according to the phase mapping chart of described transform domain communication system, produce corresponding random phasic serial signal,
S230. the random phasic serial signal P that frequency spectrum sequence A step S210 being produced and step S220 produce carries out, by element multiplying B=AP, obtaining random phase frequency spectrum sequence
subsequently random phase frequency spectrum sequence is carried out to conjugate operation and obtain final random phase frequency spectrum sequence;
S240. according to the number L of transform domain communication system parameter intermediate frequency spectrum bunch, in the random phase frequency spectrum sequence that step S230 is obtained, idle frequency spectrum distributes, and forms different branch roads.Concrete distribution principle is: the random phase frequency spectrum sequence in all frequency spectrums bunch takies all idle frequency spectrum resources jointly, and does not take identical idle frequency spectrum resource between different spectral bunch, and described number of branches equals frequency spectrum number of clusters;
The random phase frequency spectrum sequence allocation that is about to obtain is to L frequency spectrum bunch { A
1, A
2..., A
l, each frequency spectrum bunch occupies N
c/ L idle frequency spectrum, and each frequency spectrum bunch intermediate frequency spectrum sequence meets
Wherein,
represent bunch corresponding idle frequency spectrum set of l frequency spectrum.
After step S240, L the corresponding formation of frequency spectrum sequence cluster L bar branch road, and the frequency spectrum of different branch meets above-mentioned relation.
S250. the reception signal of reception antenna being received carries out Fourier transform;
S260. the different branch frequency spectrum of step S240 output bunch is carried out to multiplying with the signal of step S250 output;
S270. the different branch signal of step S260 output is carried out respectively to demodulation, obtain demodulating data and export.
Above-mentioned process of carrying out demodulation is as follows:
The output signal of the different branch S2701. step S260 being obtained is carried out inverse Fourier transform computing;
The output signal of the different branch S2702. step S2701 being obtained is extracted respectively real part;
The output signal of the different branch S2703. step S2702 being obtained is carried out peak value search, and the positional information of peak value is exported respectively as demodulating data.
System and method of the present invention is selected the number of suitable frequency spectrum bunch by system, whole idle frequency spectrums are carried out to reasonable distribution, different spectral after distribution bunch transmits respectively different data, has improved the data transmission rate of transform domain communication system, and then has improved system spectrum utilance.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned one exemplary embodiment, and in the situation that not deviating from spirit of the present invention or essential characteristic, can realize the present invention with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present invention is limited by claims rather than above-mentioned explanation, is therefore intended to all changes that drop in the implication and the scope that are equal to important document of claim to be included in the present invention.Any Reference numeral in claim should be considered as limiting related claim.Multiple unit of stating in system claim in addition, or device also can be realized by software or hardware by a unit or device.
Claims (10)
1. a transform domain communication system, its transmitting terminal comprises the first random phase frequency spectrum sequence generation module for generating frequency spectrum random phasic serial signal,
It is characterized in that, transmitting terminal also comprises: the first random phase frequency spectrum sequence allocation module, modulation module and tributary signal laminating module, wherein,
The first described random phase frequency spectrum sequence allocation module is for according to the size of described transform domain communication system parameter intermediate frequency spectrum bunch, by random phase frequency spectrum sequence allocation to different spectral bunch for secured transmission of payload data, be divided into different branch roads by the idle frequency spectrum in random phase frequency spectrum sequence, and number of branches equals frequency spectrum number of clusters, between described different spectral bunch, meet orthogonality condition, and the whole idle frequency spectrum of all frequency spectrums bunch unity of possession;
Described modulation module is used for the data of the corresponding branch road of modulating the first modulated random phase frequency spectrum sequence allocation module assignment;
Described tributary signal laminating module, for the waveform after different branch modulation is superposeed, is finally launched the waveform after stack.
2. transform domain communication system according to claim 1, it is characterized in that, the receiving terminal of described transform domain communication system comprises: the second random phase frequency spectrum sequence generation module, signal conjugate module, the second random phase frequency spectrum sequence allocation module, Fourier transform module, the module that multiplies each other and demodulation module, wherein
The second described random phase frequency spectrum sequence generation module is used for generating frequency spectrum random phasic serial signal;
Described signal conjugate module carries out conjugate operation for the frequency spectrum random phasic serial signal that the second random phase frequency spectrum sequence is generated;
The second described random phase frequency spectrum sequence allocation module is for according to the size of described transform domain communication system parameter intermediate frequency spectrum bunch, by random phase frequency spectrum sequence allocation to different spectral bunch for secured transmission of payload data, be divided into different branch roads by the idle frequency spectrum in random phase frequency spectrum sequence, and number of branches equals frequency spectrum number of clusters, between described different spectral bunch, meet orthogonality condition, and the whole idle frequency spectrum of all frequency spectrums bunch unity of possession;
Described Fourier transform module is for carrying out Fourier transform to the signal that receives antenna reception;
The described module that multiplies each other is carried out respectively phase multiplication for the data of the corresponding branch road of the second modulated random phase frequency spectrum sequence allocation module assignment with the data of Fourier transform module output;
Described demodulation module is used for the output data of the module that multiplies each other of each branch road of demodulation, and the demodulating data obtaining is exported.
3. transform domain communication system according to claim 1, is characterized in that, the first described random phase frequency spectrum sequence generation module, comprise frequency spectrum perception submodule, frequency spectrum comparison sub-module, random sequence generation submodule, phase mapping device and random phasic serial signal maker, wherein
Frequency spectrum perception submodule is for obtaining the power spectrum amplitude information on different frequency point according to external environment condition electromagnetic property;
Frequency spectrum comparison sub-module, for according to the sensing results of frequency spectrum sensing module, compares the power spectrum amplitude of different frequency point and the frequency spectrum thresholding presetting, and generates frequency spectrum sequence;
Random sequence generation submodule, for generating random bit sequence;
Phase mapping device, produces corresponding random phasic serial signal for the random bit sequence generating according to random sequence generation module;
Random phasic serial signal maker, the random phasic serial signal that the frequency spectrum sequence generating according to frequency spectrum comparison module and phase mapping device produce, generates random phase frequency spectrum sequence.
4. transform domain communication system according to claim 2, is characterized in that, the second described random phase frequency spectrum sequence generation module, comprise frequency spectrum perception submodule, frequency spectrum comparison sub-module, random sequence generation submodule, phase mapping device and random phasic serial signal maker, wherein
Frequency spectrum perception submodule is for obtaining the power spectrum amplitude information on different frequency point according to external environment condition electromagnetic property;
Frequency spectrum comparison sub-module, for according to the sensing results of frequency spectrum sensing module, compares the power spectrum amplitude of different frequency point and the frequency spectrum thresholding presetting, and generates frequency spectrum sequence; If it is little that sensing results ratio presets frequency spectrum thresholding, think idle frequency spectrum, otherwise that sensing results ratio presets frequency spectrum thresholding is large, think to take frequency spectrum;
Random sequence generation submodule, for generating random bit sequence;
Phase mapping device, produces corresponding random phasic serial signal for the random bit sequence generating according to random sequence generation module;
Random phasic serial signal maker, the random phasic serial signal that the frequency spectrum sequence generating according to frequency spectrum comparison module and phase mapping device produce, generates random phase frequency spectrum sequence.
5. according to the transform domain communication system described in claim 1 or 3, it is characterized in that, described modulation module comprises inverse Fourier transform submodule and circumference circular modulating submodule, wherein,
The first inverse Fourier transform submodule carries out inverse Fourier transform for the different spectral sequence branch road that the first random phase frequency spectrum sequence allocation module is generated, and generates basic modulation waveform corresponding to frequency spectrum sequence branch road separately;
Circumference circular modulating submodule, carries out circumference circular modulating for the output basis modulation waveform to different branch inverse Fourier transform submodule.
6. according to the transform domain communication system described in claim 2 or 4, it is characterized in that, described demodulation module comprises the second inverse Fourier transform submodule, extracts real data submodule and peak value search submodule, wherein,
The second inverse Fourier transform submodule, carries out inverse Fourier transform for the output data of the module that multiplies each other to each branch road;
Extract real data submodule, for extracting the real data of inverse Fourier transform data of the second inverse Fourier transform submodule output;
Peak value is searched submodule, for the real data of extracting is carried out to peak value seek operations.
7. an implementation method for transform domain communication system, comprises the steps: at described transform domain communication system transmitting terminal
S110. according to the electromagnetic property of external environment condition, detect the spectrum signature of all spectral regions, the spectrum signature of gained is compared with the frequency spectrum thresholding presetting, generation is used for the frequency spectrum sequence of describing idle frequency spectrum and having taken frequency spectrum;
S120. utilize random sequence generator to produce random bit sequence, according to the phase mapping chart of described transform domain communication system, produce corresponding random phasic serial signal;
S130. the random phasic serial signal that frequency spectrum sequence step S110 being produced and step S120 produce carries out, by element multiplying, obtaining random phase frequency spectrum sequence;
S140. according to the number of transform domain communication system parameter intermediate frequency spectrum bunch, in the random phase frequency spectrum sequence that step S130 is obtained, idle frequency spectrum distributes, form different branch roads, concrete distribution principle is: the random phase frequency spectrum sequence in all frequency spectrums bunch takies all idle frequency spectrum resources jointly, and meet orthogonality condition between different spectral bunch, do not take identical idle frequency spectrum resource, described number of branches equals frequency spectrum number of clusters;
S150. different branch random phase frequency spectrum sequence step S140 being obtained, modulates respectively;
The modulating data of each branch road S160. step S150 being obtained superposes, and finally the data after stack is launched.
8. the implementation method of transform domain communication system according to claim 7, is characterized in that, comprises the steps: at described transform domain communication system receiving terminal
S210. according to the electromagnetic property of external environment condition, detect the spectrum signature of all spectral regions, the spectrum signature of gained is compared with the frequency spectrum thresholding presetting, generation is used for the frequency spectrum sequence of describing idle frequency spectrum and having taken frequency spectrum;
S220. utilize random sequence generator to produce random bit sequence, according to the phase mapping chart of described transform domain communication system, produce corresponding random phasic serial signal;
S230. the random phasic serial signal that frequency spectrum sequence step S210 being produced and step S220 produce carries out, by element multiplying, obtaining random phase frequency spectrum sequence;
S240. according to the number of transform domain communication system parameter intermediate frequency spectrum bunch, in the random phase frequency spectrum sequence that step S230 is obtained, idle frequency spectrum distributes, form different branch roads, concrete distribution principle is: the random phase frequency spectrum sequence in all frequency spectrums bunch takies all idle frequency spectrum resources jointly, and meet orthogonality condition between different spectral bunch, do not take identical idle frequency spectrum resource, described number of branches equals frequency spectrum number of clusters;
S250. the reception signal of reception antenna being received carries out Fourier transform;
S260. the different branch frequency spectrum of step S240 output bunch is carried out to multiplying with the signal of step S250 output;
S270. the different branch signal of step S260 output is carried out respectively to demodulation, obtain demodulating data and export.
9. according to the implementation method of the transform domain communication system described in claim 7 or 8, it is characterized in that, the detailed process of the modulation described in step S150 is as follows:
S1501. each tributary signal of step S140 output is passed through respectively to inverse Fourier transform, form multiple incoherent basic modulation waveforms;
S1502. the different branch of step S1501 being exported, according to different input data, utilizes CCSK modulation to carry out basic modulation waveform on every branch road of circumference circular modulating, obtains the signal waveform after modulation on each branch road.
10. the implementation method of transform domain communication system according to claim 8 or claim 9, is characterized in that, the detailed process of the demodulation described in step S270 is as follows:
The output signal of the different branch S2701. step S260 being obtained is carried out inverse Fourier transform computing;
The output signal of the different branch S2702. step S2701 being obtained is extracted respectively real part;
The output signal of the different branch S2703. step S280 being obtained is carried out peak value search, and the positional information of peak value is exported respectively as demodulating data.
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|---|---|---|---|
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