CN102611670A - Transform domain communication system and realization method thereof - Google Patents
Transform domain communication system and realization method thereof Download PDFInfo
- Publication number
- CN102611670A CN102611670A CN2012100762627A CN201210076262A CN102611670A CN 102611670 A CN102611670 A CN 102611670A CN 2012100762627 A CN2012100762627 A CN 2012100762627A CN 201210076262 A CN201210076262 A CN 201210076262A CN 102611670 A CN102611670 A CN 102611670A
- Authority
- CN
- China
- Prior art keywords
- frequency spectrum
- sequence
- module
- random phase
- random
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
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, the TDCS system is decomposed into a series of separate spectrum to idle frequency range; In conjunction with the random phase generation module; Produce the basic modulation waveform of TDCS system, (Circular Cyclic Shift Keying CCSK) generates final transmission signal through circumference circulation modulation.By the way, send signal and have the statistical property that is similar to noise, therefore have lower detection probability (being primarily aimed at unauthorized user).The shortcoming of this scheme is: existing TDCS system representes the data transmitted through the circumference cycle offset of CCSK modulation; For example CCSK modulation has the different side-play amount numerical value of M kind, and the maximum information bit number that then can carry based on the transmission symbol of this modulation system is log
2(M).Therefore the availability of frequency spectrum based on the TDCS system of CCSK modulation system is lower.Therefore in limited idle frequency range, the TDCS system can not transferring large number of data, has limited its application scenarios in real system, only is used for the low speed data transmission link at present.
Summary of the invention
The objective of the invention is to have proposed a kind of transform domain communication system in order to solve the low problem of existing TDCS system spectrum utilance.
Technical scheme of the present invention is: a kind of transform domain communication system, its transmitting terminal comprise the first random phase frequency spectrum sequence generation module that is used to generate frequency spectrum random phase sequence,
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 described first random phase frequency spectrum sequence allocation module is used for the size according to said transform domain communication system parameter intermediate frequency spectrum bunch; Bunch be used for secured transmission of payload data for different spectral the random phase frequency spectrum sequence allocation; The idle frequency spectrum that is about in the random phase frequency spectrum sequence is divided into different branch roads, and number of branches equals the frequency spectrum number of clusters;
Described modulation module is used to modulate the data of the corresponding branch road of the first modulated random phase frequency spectrum sequence allocation module assignment;
Described tributary signal laminating module is used for the waveform after the different branch modulation is superposeed, and the waveform after will superposeing is at last launched.
Further, the receiving terminal of said 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 described second random phase frequency spectrum sequence generation module is used to generate frequency spectrum random phase sequence;
Described signal conjugate module is used for the frequency spectrum random phase sequence that the second random phase frequency spectrum sequence generation module generates is carried out conjugate operation;
The described second random phase frequency spectrum sequence allocation module is used for the size according to said transform domain communication system parameter intermediate frequency spectrum bunch; Bunch be used for secured transmission of payload data for different spectral the random phase frequency spectrum sequence allocation; The idle frequency spectrum that is about in the random phase frequency spectrum sequence is divided into different branch roads, and number of branches equals the frequency spectrum number of clusters;
Described Fourier transform module is used for the signal that reception antenna receives is carried out Fourier transform;
The described module that multiplies each other is used for the data of the corresponding branch road of the second modulated random phase frequency spectrum sequence allocation module assignment and carries out multiplication mutually respectively with the data of Fourier transform module output;
Described demodulation module is used for the dateout of the module that multiplies each other of each branch road of demodulation, and the demodulating data that obtains 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 said 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 that presets, produce and to be used to the frequency spectrum sequence describing idle frequency spectrum and taken frequency spectrum;
S120. utilize random sequence generator to produce random bit sequence,, produce corresponding random phase sequence according to the phase mapping chart of said transform domain communication system;
S130. the frequency spectrum sequence of step S110 generation and the random phase sequence of step S120 generation are pursued the element multiplying, obtain the random phase frequency spectrum sequence;
S140. according to the number of transform domain communication system parameter intermediate frequency spectrum bunch; Idle frequency spectrum distributes in the random phase frequency spectrum sequence that step S130 is obtained; 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 does not take identical idle frequency spectrum resource between the different spectral bunch, and said number of branches equals the frequency spectrum number of clusters;
S150. the different branch random phase frequency spectrum sequence that step S140 is obtained is modulated respectively;
The modulating data of each branch road that S160. step S150 is obtained superposes, and at last superimposed data is launched.
Concrete, the detailed process of the described modulation of step S150 is following:
S1501. each tributary signal with step S140 output passes through inverse Fourier transform respectively, forms a plurality of incoherent basic modulation waveforms.
S1502. with the different branch of step S1501 output according to different input data, utilize basic modulation waveform on every branch road of CCSK modulation carrying out circumference circulation modulation, obtain the signal waveform after the modulation on each branch road.
Further, comprise the steps: at said 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 that presets, produce and to be used to the frequency spectrum sequence describing idle frequency spectrum and taken frequency spectrum;
S220. utilize random sequence generator to produce random bit sequence,, produce corresponding random phase sequence according to the phase mapping chart of said transform domain communication system;
S230. the frequency spectrum sequence of step S210 generation and the random phase sequence of step S220 generation are pursued the element multiplying, obtain the random phase frequency spectrum sequence;
S240. according to the number of transform domain communication system parameter intermediate frequency spectrum bunch, idle frequency spectrum distributes in the random phase frequency spectrum sequence that step S230 is obtained, 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 the different spectral bunch, and said number of branches equals the 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 and the signal that step S250 exports are carried out multiplying;
S270. the different branch signal with step S260 output carries out demodulation respectively, obtains demodulating data and exports.
Concrete, the detailed process of the described demodulation of step S270 is following:
The output signal of the different branch that S2701. step S260 is obtained carries out the inverse Fourier transform computing;
The output signal of the different branch that S2702. step S2701 is obtained extracts real part respectively;
The output signal of the different branch that S2703. step S2702 is obtained carries out the peak value search, and the positional information of peak value is exported respectively as demodulating data.
Beneficial effect of the present invention: the condition of strict orthogonal between technical characterstic and the idle frequency spectrum of system and method for the present invention through combining the CCSK modulation; Select the number of frequency spectrum suitable in the parameter bunch according to system design; Whole idle frequency spectrums of frequency spectrum perception output are carried out reasonable distribution; Wherein satisfy orthogonality condition between the different spectral bunch, and the whole idle frequency spectrum of all frequency spectrums bunch unity of possession.After the frequency spectrum reasonable distribution; Different spectral after the mutually orthogonal distribution bunch respectively produces corresponding basic modulation waveform through inverse Fourier transform and forms different branch roads; Different branch is carried out CCSK modulation according to the input data respectively, is superimposed at last and sends.Can find out that the different spectral after system and method utilization of the present invention distributes bunch transmits different data respectively, has improved the data transmission rate of transform domain communication system, and then has improved the system spectrum utilance.
Description of drawings
Fig. 1 is a transform domain communication system transmitting terminal system block diagram of the present invention.
Fig. 2 is a transform domain communication system receiving terminal system block diagram of the present invention.
Fig. 3 is the implementation method transmitting terminal signal processing flow sketch map of transform domain communication system of the present invention.
Fig. 4 is the implementation method receiving end signal handling process sketch map 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 is as shown in Figure 1, comprises the first random phase frequency spectrum sequence generation module that is used to generate frequency spectrum random phase sequence,
Also comprise: the first random phase frequency spectrum sequence allocation module, modulation module and tributary signal laminating module, wherein,
The described first random phase frequency spectrum sequence allocation module is used for the size according to said transform domain communication system parameter intermediate frequency spectrum bunch; Bunch be used for secured transmission of payload data for different spectral the random phase frequency spectrum sequence allocation; The idle frequency spectrum that is about in the random phase frequency spectrum sequence is divided into different branch roads, and number of branches equals the frequency spectrum number of clusters;
Described modulation module is used to modulate the data of the corresponding branch road of the first modulated random phase frequency spectrum sequence allocation module assignment; Can find out that the number of the modulation module of transmitting terminal equals number of branches.
Described tributary signal laminating module is used for the waveform after the different branch modulation is superposeed, and the waveform after will superposeing is at last launched.
The first random phase frequency spectrum sequence generation module here comprises the frequency spectrum perception submodule, frequency spectrum comparison sub-module, random sequence generation submodule, phase mapping device and random phase sequence generator, wherein,
The frequency spectrum perception submodule is used for obtaining the power spectrum amplitude information on the different frequency point according to the external environment condition electromagnetic property;
The frequency spectrum comparison sub-module is used for the sensing results according to frequency spectrum sensing module, and the power spectrum amplitude of different frequency point and the frequency spectrum thresholding that presets are compared, and generates the frequency spectrum sequence.
Concrete relatively is: big if the sensing results ratio presets the frequency spectrum thresholding, then think to take frequency spectrum; Otherwise, then think idle frequency spectrum.
Random sequence generation submodule is used to generate random bit sequence;
The phase mapping device is used for producing corresponding random phase sequence according to the random bit sequence that the random sequence generating module generates;
The random phase sequence generator according to the frequency spectrum sequence of frequency spectrum comparison module generation and the random phase sequence of phase mapping device generation, generates the random phase frequency spectrum sequence.
For the frequency spectrum perception submodule, if total bandwidth is the W hertz in the spectral regions, according to transform domain communication system parameter sub-carriers number N and subcarrier spacing Δ f, W=N Δ f then, detection signal power spectrum amplitude on each subcarrier frequency.
In the frequency spectrum comparison sub-module, to k frequency spectrum signature value A
k, when frequency power spectrum amplitude greater than the frequency spectrum thresholding T that presets
Threshold, setting this Frequency point numerical value was 0 (representing that this Frequency point takies); Be less than or equal to the frequency spectrum thresholding T that presets when the power spectrum amplitude
Threshold, setting this Frequency point numerical value was 1 (representing that this Frequency point is idle), the frequency spectrum comparison procedure can be described as:
Through above-mentioned frequency spectrum perception and frequency spectrum comparison procedure, can access the frequency spectrum sequence of forming by numerical value 0,1 and be used to describe external environment condition frequency operating position, i.e. A={A
0, A
1, A
2..., A
N-1.Suppose in the frequency spectrum sequence A and have N
CIndividual idle frequency spectrum, then idle frequency spectrum set omega
CSatisfy { A
k=1, k ∈ Ω
C.
The modulation module here comprises inverse Fourier transform submodule and circumference circulation modulation submodule, wherein,
The first inverse Fourier transform submodule is used for the different spectral sequence branch road that the first random phase frequency spectrum sequence allocation module generates is carried out inverse Fourier transform, generates the corresponding basic modulation waveform of frequency spectrum sequence branch road separately;
Circumference circulation modulation submodule is used for the output basis modulation waveform of the different branch first inverse Fourier transform submodule is carried out circumference circulation modulation.
As a preferred scheme; The receiving terminal system block diagram of transform domain communication system is 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 described second random phase frequency spectrum sequence generation module is used to generate frequency spectrum random phase sequence;
Described signal conjugate module is used for the frequency spectrum random phase sequence that the second random phase frequency spectrum sequence generation module generates is carried out conjugate operation;
The described second random phase frequency spectrum sequence allocation module is used for the size according to said transform domain communication system parameter intermediate frequency spectrum bunch; Bunch be used for secured transmission of payload data for different spectral the random phase frequency spectrum sequence allocation; The idle frequency spectrum that is about in the random phase frequency spectrum sequence is divided into different branch roads, and number of branches equals the frequency spectrum number of clusters;
Described Fourier transform module is used for the signal that reception antenna receives is carried out Fourier transform;
The described module that multiplies each other is used for the data of the corresponding branch road of the second modulated random phase frequency spectrum sequence allocation module assignment and carries out multiplication mutually respectively with the data of Fourier transform module output;
Described demodulation module is used for the dateout of the module that multiplies each other of each branch road of demodulation, and the demodulating data that obtains is exported.Can find out that the demodulation module of receiving terminal equals number of branches with the number of the module that multiplies each other.
The structure of the second random phase frequency spectrum sequence generation module here is identical with the structure of the first random phase frequency spectrum sequence generation module of transmitting terminal, no longer specifies.
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 is used for the dateout of the module that multiplies each other of each branch road is carried out inverse Fourier transform;
Extract the real data submodule, be used to extract the real data of the inverse Fourier transform data of second inverse Fourier transform submodule output;
Peak value is searched submodule, is used for the real data of extracting is carried out the peak value seek operations.
The invention allows for a kind of implementation method of transform domain communication system, wherein as shown in Figure 3 at said transform domain communication system transmitting terminal handling process sketch map, 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 that presets, produce and to be used to frequency spectrum sequence A={ A of describing idle frequency spectrum and having taken frequency spectrum
0, A
1, A
2..., A
N-1;
For frequency spectrum perception, if total bandwidth is the W hertz in the spectral regions, according to transform domain communication system parameter sub-carriers number N and subcarrier spacing Δ f, then W=N Δ f.Frequency spectrum perception is detection signal power spectrum amplitude on each subcarrier frequency.
Frequency spectrum ratio in, to k frequency spectrum signature value A
k, when frequency power spectrum amplitude greater than the frequency spectrum thresholding T that presets
Threshold, setting this Frequency point numerical value was 0 (representing that this Frequency point takies); Be less than or equal to the frequency spectrum thresholding T that presets when the power spectrum amplitude
Threshold, setting this Frequency point numerical value was 1 (representing that this Frequency point is idle), the frequency spectrum comparison procedure can be described as:
Through above-mentioned frequency spectrum perception and frequency spectrum comparison procedure, can access the frequency spectrum sequence of forming by numerical value 0,1 and be used to describe external environment condition frequency operating position, i.e. A={A
0, A
1, A
2..., A
N-1.Suppose in the frequency spectrum sequence A and have N
CIndividual idle frequency spectrum, then idle frequency spectrum set omega
CSatisfy { A
k=1, k ∈ Ω
C.
S120. utilize random sequence generator to produce random bit sequence; Then according to the phase mapping chart of said transform domain communication system; Produce corresponding random phase sequence, promptly
mi representes the phase place of i element of random phase sequence.
S130. the frequency spectrum sequence A of step S110 generation and the random phase sequence of step S120 generation are pursued element multiplying P, obtain the random phase frequency spectrum sequence; B=AP obtains the random phase frequency spectrum sequence
The random phase frequency spectrum sequence is mainly used in and produces the waveform with noise characteristic, has low probability of intercept, and distinguishes different users in the access mode.
S140. according to the number L of transform domain communication system parameter intermediate frequency spectrum sequence cluster, give L frequency spectrum bunch { A to the random phase frequency spectrum sequence allocation that step S130 obtains
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 satisfies:
Wherein, the idle frequency spectrum set of
expression l frequency spectrum bunch correspondence.
It should be noted that in order to make full use of the idle frequency spectrum resource and to avoid the interference between the different spectral bunch, all frequency spectrums bunch unity of possession idle frequency spectrum set omega
C, and can not share idle frequency spectrum between the different spectral bunch, promptly
Behind step S140, L the corresponding formation of frequency spectrum sequence cluster L bar branch road, and the frequency spectrum of different branch satisfies above-mentioned relation.
S150. with 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 with the different branch of step S150 output superposes, and at last superimposed data is launched.
Above-mentioned process of modulating is following:
S1501. the L bar tributary signal with step S140 output passes through inverse Fourier transform respectively, forms L incoherent basic modulation waveform.
S1502. with the different branch of step S1501 output according to different input data, utilize basic modulation waveform on every branch road of CCSK modulation carrying out circumference circulation modulation, therefore obtain signal waveform after the different modulation of L bar.
Need to prove: the input data of each branch road are appreciated that and are corresponding different input data source; Also be appreciated that: system has only a data input source; According to the number of branch road, be decomposed into corresponding sub data flow then, corresponding to the input of CCSK modulation in the different branch; Be decomposed into the multichannel sub data flow to a data input source and belong to the ordinary skill in the art, be not described in detail.
As a preferred scheme, said transform domain communication system receiving terminal handling process sketch map is 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 that presets, produce and to be used to the frequency spectrum sequence describing idle frequency spectrum and taken frequency spectrum;
For frequency spectrum perception, if total bandwidth is the W hertz in the spectral regions, according to transform domain communication system parameter sub-carriers number N and subcarrier spacing Δ f, W=N Δ f then, detection signal power spectrum amplitude on each subcarrier frequency of frequency spectrum perception.
Frequency spectrum ratio in, to k frequency spectrum signature value A
k, when frequency power spectrum amplitude greater than the frequency spectrum thresholding T that presets
Threshold, setting this Frequency point numerical value was 0 (representing that this Frequency point takies); Be less than or equal to the frequency spectrum thresholding T that presets when the power spectrum amplitude
Threshold, setting this Frequency point numerical value was 1 (representing that this Frequency point is idle), the frequency spectrum comparison procedure can be described as
Through above-mentioned frequency spectrum perception and frequency spectrum comparison procedure, can access the frequency spectrum sequence of forming by numerical value 0,1 and be used to describe external environment condition frequency operating position, i.e. A={A
0, A
1, A
2..., A
N-1.Suppose in the frequency spectrum sequence A and have N
CIndividual idle frequency spectrum, then idle frequency spectrum set omega
CSatisfy { A
k=1, k ∈ Ω
C.
S220. utilize random sequence generator to produce random bit sequence; Then according to the phase mapping chart of said transform domain communication system; Produce corresponding random phase sequence, i.e.
S230. the frequency spectrum sequence A that step S210 is produced is pursued element multiplying B=AP with the random phase sequence P of step S220 generation, obtains random phase frequency spectrum sequence
and subsequently the random phase frequency spectrum sequence is carried out 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, idle frequency spectrum distributes in the random phase frequency spectrum sequence that step S230 is obtained, 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 the different spectral bunch, and said number of branches equals the frequency spectrum number of clusters;
The random phase frequency spectrum sequence allocation that is about to obtain is given 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 satisfies
Wherein, the idle frequency spectrum set of
expression l frequency spectrum bunch correspondence.
Behind step S240, L the corresponding formation of frequency spectrum sequence cluster L bar branch road, and the frequency spectrum of different branch satisfies 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 and the signal that step S250 exports are carried out multiplying;
S270. the different branch signal with step S260 output carries out demodulation respectively, obtains demodulating data and exports.
Above-mentioned process of carrying out demodulation is following:
The output signal of the different branch that S2701. step S260 is obtained carries out the inverse Fourier transform computing;
The output signal of the different branch that S2702. step S2701 is obtained extracts real part respectively;
The output signal of the different branch that S2703. step S2702 is obtained carries out the 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 through system design; Whole idle frequency spectrums are carried out reasonable distribution; Different spectral after the distribution bunch transmits different data respectively, has improved the data transmission rate of transform domain communication system, and then has improved the system spectrum utilance.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned example embodiment, and under the situation that does not deviate 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 accompanying claims rather than above-mentioned explanation, therefore is intended to the implication of the equivalents that drops on claim and all changes in the scope are included in the present invention.Should any Reference numeral in the claim be regarded as limit related claim.A plurality of unit of stating in system's claim in addition, or device also can be realized through software or hardware by a unit or device.
Claims (10)
1. transform domain communication system, its transmitting terminal comprises the first random phase frequency spectrum sequence generation module that is used to generate frequency spectrum random phase sequence,
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 described first random phase frequency spectrum sequence allocation module is used for the size according to said transform domain communication system parameter intermediate frequency spectrum bunch; Bunch be used for secured transmission of payload data for different spectral the random phase frequency spectrum sequence allocation; The idle frequency spectrum that is about in the random phase frequency spectrum sequence is divided into different branch roads, and number of branches equals the frequency spectrum number of clusters;
Described modulation module is used to modulate the data of the corresponding branch road of the first modulated random phase frequency spectrum sequence allocation module assignment;
Described tributary signal laminating module is used for the waveform after the different branch modulation is superposeed, and the waveform after will superposeing is at last launched.
2. transform domain communication system according to claim 1; It is characterized in that; The receiving terminal of said 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 described second random phase frequency spectrum sequence generation module is used to generate frequency spectrum random phase sequence;
Described signal conjugate module is used for the frequency spectrum random phase sequence that the second random phase frequency spectrum sequence generates is carried out conjugate operation;
The described second random phase frequency spectrum sequence allocation module is used for the size according to said transform domain communication system parameter intermediate frequency spectrum bunch; Bunch be used for secured transmission of payload data for different spectral the random phase frequency spectrum sequence allocation; The idle frequency spectrum that is about in the random phase frequency spectrum sequence is divided into different branch roads, and number of branches equals the frequency spectrum number of clusters;
Described Fourier transform module is used for the signal that reception antenna receives is carried out Fourier transform;
The described module that multiplies each other is used for the data of the corresponding branch road of the second modulated random phase frequency spectrum sequence allocation module assignment and carries out multiplication mutually respectively with the data of Fourier transform module output;
Described demodulation module is used for the dateout of the module that multiplies each other of each branch road of demodulation, and the demodulating data that obtains is exported.
3. transform domain communication system according to claim 1 is characterized in that, the described first random phase frequency spectrum sequence generation module; Comprise the frequency spectrum perception submodule; Frequency spectrum comparison sub-module, random sequence generation submodule, phase mapping device and random phase sequence generator, wherein
The frequency spectrum perception submodule is used for obtaining the power spectrum amplitude information on the different frequency point according to the external environment condition electromagnetic property;
The frequency spectrum comparison sub-module is used for the sensing results according to frequency spectrum sensing module, and the power spectrum amplitude of different frequency point and the frequency spectrum thresholding that presets are compared, and generates the frequency spectrum sequence.
Random sequence generation submodule is used to generate random bit sequence;
The phase mapping device is used for producing corresponding random phase sequence according to the random bit sequence that the random sequence generating module generates;
The random phase sequence generator according to the frequency spectrum sequence of frequency spectrum comparison module generation and the random phase sequence of phase mapping device generation, generates the random phase frequency spectrum sequence.
4. transform domain communication system according to claim 2 is characterized in that, the described second random phase frequency spectrum sequence generation module; Comprise the frequency spectrum perception submodule; Frequency spectrum comparison sub-module, random sequence generation submodule, phase mapping device and random phase sequence generator, wherein
The frequency spectrum perception submodule is used for obtaining the power spectrum amplitude information on the different frequency point according to the external environment condition electromagnetic property;
The frequency spectrum comparison sub-module is used for the sensing results according to frequency spectrum sensing module, and the power spectrum amplitude of different frequency point and the frequency spectrum thresholding that presets are compared, and generates the frequency spectrum sequence.If it is little that the sensing results ratio presets the frequency spectrum thresholding, then think idle frequency spectrum, otherwise that the sensing results ratio presets the frequency spectrum thresholding is big, then think to take frequency spectrum;
Random sequence generation submodule is used to generate random bit sequence;
The phase mapping device is used for producing corresponding random phase sequence according to the random bit sequence that the random sequence generating module generates;
The random phase sequence generator according to the frequency spectrum sequence of frequency spectrum comparison module generation and the random phase sequence of phase mapping device generation, generates the random phase frequency spectrum sequence.
5. according to claim 1 or 3 described transform domain communication systems, it is characterized in that described modulation module comprises inverse Fourier transform submodule and circumference circulation modulation submodule, wherein,
The first inverse Fourier transform submodule is used for the different spectral sequence branch road that the first random phase frequency spectrum sequence allocation module generates is carried out inverse Fourier transform, generates the corresponding basic modulation waveform of frequency spectrum sequence branch road separately;
Circumference circulation modulation submodule is used for the output basis modulation waveform of the different branch first inverse Fourier transform submodule is carried out circumference circulation modulation.
6. according to claim 2 or 4 described transform domain communication systems, 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 is used for the dateout of the module that multiplies each other of each branch road is carried out inverse Fourier transform;
Extract the real data submodule, be used to extract the real data of the inverse Fourier transform data of second inverse Fourier transform submodule output;
Peak value is searched submodule, is used for the real data of extracting is carried out the peak value seek operations.
7. the implementation method of a transform domain communication system comprises the steps: at said 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 that presets, produce and to be used to the frequency spectrum sequence describing idle frequency spectrum and taken frequency spectrum;
S120. utilize random sequence generator to produce random bit sequence,, produce corresponding random phase sequence according to the phase mapping chart of said transform domain communication system;
S130. the frequency spectrum sequence of step S110 generation and the random phase sequence of step S120 generation are pursued the element multiplying, obtain the random phase frequency spectrum sequence;
S140. according to the number of transform domain communication system parameter intermediate frequency spectrum bunch; Idle frequency spectrum distributes in the random phase frequency spectrum sequence that step S130 is obtained; 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 does not take identical idle frequency spectrum resource between the different spectral bunch, and said number of branches equals the frequency spectrum number of clusters;
S150. the different branch random phase frequency spectrum sequence that step S140 is obtained is modulated respectively;
The modulating data of each branch road that S160. step S150 is obtained superposes, and at last superimposed data is launched.
8. the implementation method of transform domain communication system according to claim 7 is characterized in that, comprises the steps: at said 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 that presets, produce and to be used to the frequency spectrum sequence describing idle frequency spectrum and taken frequency spectrum;
S220. utilize random sequence generator to produce random bit sequence,, produce corresponding random phase sequence according to the phase mapping chart of said transform domain communication system;
S230. the frequency spectrum sequence of step S210 generation and the random phase sequence of step S220 generation are pursued the element multiplying, obtain the random phase frequency spectrum sequence;
S240. according to the number of transform domain communication system parameter intermediate frequency spectrum bunch, idle frequency spectrum distributes in the random phase frequency spectrum sequence that step S230 is obtained, 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 the different spectral bunch, and said number of branches equals the 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 and the signal that step S250 exports are carried out multiplying;
S270. the different branch signal with step S260 output carries out demodulation respectively, obtains demodulating data and exports.
9. according to the implementation method of claim 7 or 8 described transform domain communication systems, it is characterized in that the detailed process of the described modulation of step S150 is following:
S1501. each tributary signal with step S140 output passes through inverse Fourier transform respectively, forms a plurality of incoherent basic modulation waveforms.
S1502. with the different branch of step S1501 output according to different input data, utilize basic modulation waveform on every branch road of CCSK modulation carrying out circumference circulation modulation, obtain the signal waveform after the modulation on each branch road.
10. according to Claim 8 or the implementation method of 9 described transform domain communication systems, it is characterized in that the detailed process of the described demodulation of step S270 is following:
The output signal of the different branch that S2701. step S260 is obtained carries out the inverse Fourier transform computing;
The output signal of the different branch that S2702. step S2701 is obtained extracts real part respectively;
The output signal of the different branch that S2703. step S280 is obtained carries out the peak value search, and the positional information of peak value is exported respectively as demodulating data.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210076262.7A CN102611670B (en) | 2012-03-21 | 2012-03-21 | Transform domain communication system and realization method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210076262.7A CN102611670B (en) | 2012-03-21 | 2012-03-21 | Transform domain communication system and realization method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102611670A true CN102611670A (en) | 2012-07-25 |
| CN102611670B CN102611670B (en) | 2014-05-21 |
Family
ID=46528827
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201210076262.7A Expired - Fee Related CN102611670B (en) | 2012-03-21 | 2012-03-21 | Transform domain communication system and realization method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102611670B (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1829211A (en) * | 2006-04-13 | 2006-09-06 | 电子科技大学 | Transform domain communication method based on interlaced and orthogonal frequency division multiplex |
| US20090059882A1 (en) * | 2007-08-31 | 2009-03-05 | Jeng-Kuang Hwang | Multi-carrier spread spectrum device using cyclic shift orthogonal keying, transmitter, receiver, and communication system thereof |
-
2012
- 2012-03-21 CN CN201210076262.7A patent/CN102611670B/en not_active Expired - Fee Related
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1829211A (en) * | 2006-04-13 | 2006-09-06 | 电子科技大学 | Transform domain communication method based on interlaced and orthogonal frequency division multiplex |
| US20090059882A1 (en) * | 2007-08-31 | 2009-03-05 | Jeng-Kuang Hwang | Multi-carrier spread spectrum device using cyclic shift orthogonal keying, transmitter, receiver, and communication system thereof |
| US20120039364A1 (en) * | 2007-08-31 | 2012-02-16 | Jeng-Kuang Hwang | Multi-carrier spread spectrum device using cyclic shift orthogonal keying, transmitter, receiver, and communication system thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN102611670B (en) | 2014-05-21 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US20210351880A1 (en) | Multiple access using orthogonal time frequency space modulation | |
| CN103346989B (en) | The blind source of single channel based on multichannel frequency hopping separates jam-resistant communication system and method | |
| WO2017076036A1 (en) | Shifted sub-carrier-based frequency domain chaotic cognitive radio system | |
| US10313173B2 (en) | Method and apparatus for performing sequence synchronization in mobile communication system | |
| CN112291168B (en) | Pilot design and channel information acquisition method for large-scale MIMO orthogonal time-frequency space modulation downlink | |
| CN101395815A (en) | Mobile station, base station, communication system and communication method | |
| CN106230573B (en) | A kind of TDCS multiple access access improved method based on sequence design | |
| CN104735017A (en) | Non-orthogonal multi-carrier digital modulation and demodulation method and device | |
| CN103873106A (en) | Noise-like Chirp-based Q-CCSK (Quadrature-Cyclic Code Shift Keying) spread spectrum communication method | |
| CN103888404A (en) | Full frequency spectrum carrier modulation method based on frequency spectrum shift | |
| CN103269323A (en) | Multi-user transform domain communicating system and method | |
| CN103220015A (en) | Fast frequency hopping transmitter, fast frequency hopping receiver, fast frequency hopping system and fast frequency hopping method based on pilot frequency superposition | |
| CN103888405A (en) | Method for modulating full frequency spectrum carrier wave | |
| CN102546513B (en) | Method and system for designing time domain man-made noises in orthogonal frequency division multiplexing system | |
| CN112737998B (en) | Radar communication integrated signal design method based on OCDM | |
| CN103338176A (en) | Implementation method of waveform reuse modulator-demodulator | |
| CN103152310B (en) | Reduce the time domain autocorrelation matching system and method for the peak-to-average power ratio of ofdm system | |
| CN102611670B (en) | Transform domain communication system and realization method thereof | |
| CN104780133A (en) | Frequency hopping anti-interception method in orthogonal frequency division multiplexing (OFDM) system | |
| CN103152309A (en) | Frequency domain self-correlation matching system and method for reducing PAOR (peak-to-average power ratio) of OFDM (orthogonal frequency division multiplexing) system | |
| CN110868280A (en) | Data sending method, data receiving method and device | |
| CN101408871B (en) | High-efficiency implementing method and equipment of digital crosscorrelator | |
| CN102647390B (en) | Transform domain communication system and realization method thereof | |
| CN107360112A (en) | Divide multiplexed communications method based on the high spectrum effect that zero hangover DFT is expanded | |
| US11350377B2 (en) | Method for performing uplink synchronization in wireless communication system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140521 Termination date: 20170321 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |