CN105099575B - Broadcast television signal real-time perception system and method based on MATLAB GUI - Google Patents
Broadcast television signal real-time perception system and method based on MATLAB GUI Download PDFInfo
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Abstract
The present invention provides a kind of broadcast television signal real-time perception system and method based on MATLAB GUI.Wherein, the sensory perceptual system is arranged in MATLAB GUI platform, includes at least: for obtaining insmoding for broadcast television signal to be detected；For carrying out cyclostationary characteristic detection to broadcast television signal to be detected, to determine the tested whether occupied frequency spectrum sensing module of frequency range；And it is occupied for working as tested frequency range, carrier estimation is carried out based on circulation spectrum correlation, and the channel search module of frequency range belonging to estimated carrier wave is determined based on the tv channel frequency division information prestored；In addition, it may further comprise the signal identification module of the type for determining authorization signal entrained by carrier wave based on carrier information number；As a result, can real-time perception broadcast television signal, construction, complement point and optimization for subsequent ground digital TV network provide reliable reference frame.
Description
Technical field
The present invention relates to signals to perceive field, real-time more particularly to a kind of broadcast television signal based on MATLAB GUI
Sensory perceptual system and method.
Background technique
With the rapid development of wireless communication technique, people are increasing for the demand of frequency spectrum resource, and " wireless frequency spectrum is withered
Exhausting " phenomenon is on the rise.Although having had breakthrough in source coding and channel coding technology, it is negative to can be improved certain channel
Loading capability, but still far lag behind the increased requirement of information content.Therefore, in order to meet wireless communications traffic growth need
It asks, other than how research improves the availability of frequency spectrum, it is also necessary to which how research uses sufficient frequency spectrum resource.
In the UHF waveband of existing radio and television, DS13~DS48 is shared, the channel of 36 8M bandwidth is used for terrestrial television industry
Business, frequency range is from 470~798MHz.Although radio and television use high power high tower coverage mode, can terrestrial television be believed
Number energy is quick and safety covering, but high power high tower coverage mode produces " white frequency in the frequency planning of radio and television
Spectrum " area, belongs to the frequency spectrum that can not be enabled, the white frequency spectrum for how developing and utilizing radio and television UHF waveband becomes research hotspot.
Frequency spectrum perception technology is to realize the premise and core technology of white spectrum application, and cognitive user needs to utilize frequency spectrum perception
Technology detects the frequency idle condition of authorized spectrum band, therefrom finds out workable channel.When authorized user accesses again, frequency spectrum
Cognition technology will detect in time and concede rapidly the channel of occupancy, other idle channels or abort communication are switched to, to keep away
Exempt from authorized user by harmful interference.
From the point of view of existing technological means, frequency spectrum perception technology is divided into single node detection and cooperative detection.Single node detection
Refer to that each cognitive user independently carries out frequency spectrum perception and judged；Cooperative detection refers to that multiple cognitive users carry out frequency respectively
Result summarizing and reporting is carried out synthesis by data center or cognitive database and sentenced to data center or cognitive database after spectrum perception
It is disconnected.Single node detection is subdivided into energy measuring, matched filter detection, cyclostationary characteristic detection, interference temperature detection etc..
Matched filter detection method is best performance in various cognition technologies, and it is optimal that it can be such that white frequency spectrum terminal obtains
Output gain.But matched filter detection method needs to know the prior information (modulation system, pulse wave etc.) of authorization signal,
There is significant limitation in practical engineering applications.The realization of energy measuring method is the simplest, uses in practical engineering applications
The most extensively.But energy measuring method suffers from the influence of signal-to-noise ratio, and it is not high to detect success rate under low signal-to-noise ratio conditions.It follows
Ring stationary nature detection method is not influenced by signal-to-noise ratio, the also detection probability with higher in the case where low signal-to-noise ratio.But it follows
Ring stationary nature detection method computation complexity is high, and the detection time needed is longer.Local oscillator leakage power detection and interference temperature inspection
Survey is the detection based on receiver, not within limit of consideration.
How to realize that the real-time perception of broadcast television signal has become the technical task that those skilled in the art need to solve.
Summary of the invention
In view of the foregoing deficiencies of prior art, the purpose of the present invention is to provide a kind of based on the wide of MATLAB GUI
TV signal real-time perception system and method is broadcast, to realize the real-time perception to broadcast television signal.
In order to achieve the above objects and other related objects, the present invention provides a kind of radio and television letter based on MATLAB GUI
Number real-time perception system, includes at least: insmoding, for obtaining broadcast television signal to be detected；Frequency spectrum sensing module,
For carrying out cyclostationary characteristic detection to the broadcast television signal to be detected, to determine whether tested frequency range is occupied；
And channel search module, it is occupied for working as tested frequency range, carrier estimation is carried out based on circulation spectrum correlation, and based on pre-
The tv channel frequency division information deposited determines frequency range belonging to estimated carrier wave.
Preferably, described to insmod further include: converting unit, the binary system broadcast television signal conversion for being loaded onto
For 10 system broadcast television signals.
Preferably, the broadcast television signal real-time perception system based on MATLAB GUI further include: signal identification mould
Block, for determining the type of authorization signal entrained by the carrier wave based on carrier information.
The broadcast television signal real-time perception method based on MATLAB GUI that the present invention also provides a kind of, includes at least:
1) broadcast television signal to be detected is obtained；2) cyclostationary characteristic detection is carried out to the broadcast television signal to be detected,
To determine whether tested frequency range is occupied；And 3) when tested frequency range is occupied, estimated based on circulation spectrum correlation to carry out carrier wave
Meter, and frequency range belonging to estimated carrier wave is determined based on the tv channel frequency division information prestored.
Preferably, in step 1) further include: the binary system broadcast television signal being loaded onto is converted to 10 systems broadcast electricity
Depending on signal.
Preferably, the broadcast television signal real-time perception method based on MATLAB GUI further include: believed based on carrier wave
Cease the type to determine authorization signal entrained by the carrier wave.
As described above, the broadcast television signal real-time perception system and method for the invention based on MATLAB GUI, has
Below the utility model has the advantages that energy real-time perception broadcast television signal, can mention for construction, complement point and the optimization of terrestrial DTV network
For reliable reference frame, while it also can be used as the foundation of white spectrum application Technique Popularizing.
Detailed description of the invention
One kind that Fig. 1 is shown as the broadcast television signal real-time perception system of the invention based on MATLAB GUI is preferably shown
It is intended to.
Fig. 2 is shown as the another kind of the broadcast television signal real-time perception system of the invention based on MATLAB GUI preferably
Schematic diagram.
Fig. 3 is shown as the flow chart of the broadcast television signal real-time perception method of the invention based on MATLAB GUI.
Component label instructions
1 sensory perceptual system
11 insmod
12 frequency spectrum sensing modules
13 channel search modules
14 signal identification modules
S1~S3 step
Specific embodiment
Illustrate embodiments of the present invention below by way of specific specific example, those skilled in the art can be by this specification
Other advantages and efficacy of the present invention can be easily understood for disclosed content.The present invention can also pass through in addition different specific realities
The mode of applying is embodied or practiced, the various details in this specification can also based on different viewpoints and application, without departing from
Various modifications or alterations are carried out under spirit of the invention.
It please refers to Fig.1 to Fig.3.It should be noted that diagram provided in the present embodiment only illustrates this in a schematic way
The basic conception of invention, only shown in schema then with related component in the present invention rather than package count when according to actual implementation
Mesh, shape and size are drawn, when actual implementation kenel, quantity and the ratio of each component can arbitrarily change for one kind, and its
Assembly layout kenel may also be increasingly complex.
As shown in Figure 1, the present invention provides a kind of broadcast television signal real-time perception system based on MATLAB GUI.Its
In, the sensory perceptual system 1 is arranged in MATLAB GUI platform, it includes at least: the 11, frequency spectrum sensing module 12 that insmods,
Channel search module 13.
It is described to insmod 11 for obtaining broadcast television signal to be detected.
For example, being obtained in the equipment that 11 are connected as the USB interface of the computer equipment belonging to itself that insmods
Broadcast television signal to be detected, and be loaded into the MATLAB GUI platform belonging to itself.
Preferably, described to insmod 11 further include: converting unit 111, as shown in Figure 2.
If the broadcast television signal to be detected obtained is binary signal, the converting unit 111 is wide by binary system
It broadcasts TV signal and is converted to 10 system broadcast television signals, so as to subsequent processing.
The frequency spectrum sensing module 12 is used to carry out cyclostationary characteristic detection to the broadcast television signal to be detected,
To determine whether tested frequency range is occupied.
For TV signal, due to itself having the factors such as modulation, coding, make its auto-correlation function that there is the period
Property, so such signal can be classified as cyclo-stationary signal.Cyclo-stationary signal has apparent Cyclic Spectrum at its cycle frequency
Amplitude.The detection that signal is completed using the circulation amplitude at the peculiar cycle frequency of unlike signal, will have good antinoise
And jamming performance.
For example, it is assumed that the mean value and auto-correlation function of random process x (t) have periodically, and period and signal week
Phase is identical, then the mean value m of x (t)x(t) and auto-correlation functionIt should meet:
Auto-correlation function in above formula is using T as the period, Fourier space form are as follows:
It is Fourier space coefficient, may be expressed as:
Referred to as Cyclic Autocorrelation Function (Cyclic Autocorrelation Function, CAF), α=m/T
(m=0,1,2 ... k ...) be cycle frequency (Cyclic Frequency), when m=1 referred to as basic cycle frequency, α=0
When, Cyclic Autocorrelation Function is exactly traditional auto-correlation function.
In above formula, enable
Then above formula can be rewritten as:
By continuous Cyclic Autocorrelation Function can directly be generalized to discrete Cyclic Autocorrelation Function to get to:
Correspondingly, spectral density function (Spectral Correlation Function, SCF), it can be by Fu
Leaf transformation obtains, it may be assumed that
Spectral density function is alternatively referred to as cyclic spectral density function (Cyclic Spectrum Density, CSD).
It is wide for terrestrial DTV/ground mobile multimedia of China's independent intellectual property right based on OFDM Digital Transmission
(DTMB/CMMB) signal is broadcast, spectral correlative coefficient indicates are as follows:
Wherein, α is the cycle frequency of the Cyclic Autocorrelation Function of the DTMB/CMMB signal of OFDM Digital Transmission,
For cyclic spectral density function.
Decision threshold are as follows:
Wherein,The frequency spectrum sensing module 12 is judged to be detected based on following manner
Whether there is authorization signal in DTMB/CMMB:
CIThe spectral correlative coefficient for indicating tested point, if CI> CTH, H1Indicate authorization signal presence；If CI≤CTH, H0It indicates
Tested frequency range is unoccupied.
When tested frequency range is occupied, the channel search module 13 carries out carrier estimation based on circulation spectrum correlation, and
Frequency range belonging to estimated carrier wave is determined based on the tv channel frequency division information prestored.
For digital television signal and anolog TV signals, carrier estimation method is slightly different.
DTMB/CMMB signal based on OFDM, cyclic spectral density function are as follows:
Wherein, α is cycle frequency, fcFor carrier frequency, fsFor sample frequency, N is signal sampling points, TsFor OFDM symbol
Number length, Δ f=1/TsFor subcarrier spacing,As available from the above equation, broadcast television signal is followed in α=0
F=± f of ring spectral cross sectioncα=± 2f of place or f=0 circulation spectral cross sectioncThere are peak points, i.e. highest spectral line at place.If being composed with highest
Line is as characteristic value, it is estimated that the carrier frequency of broadcast television signal to be detected, so as to further pass through inquiry
Tv channel frequency division table determines frequency range belonging to carrier wave.
Therefore, based on the above principles, the channel search module 13 first searches for broadcast television signal f=0's to be detected
Maximum in Cyclic Spectrum sectional view positive axisAnd determine the maximumThe serial number k of corresponding broadcast television signal,
It is based on formula again:Determine the carrier frequency of broadcast television signal to be detected, and further by looking into
It askes tv channel frequency and divides table, for example, the frequency range information of DS13~DS4836 channel, to determine carrier wave fcAffiliated
Frequency range.
For the anolog TV signals of China's Pal-D standard, carrier estimation principle and DTMB/CMMB are essentially identical, and
Difference is that, according to simulated television spectrum signature, there are two carrier frequencies, respectively luminance carrier frequency for Pal-D standard
With audio signal carrier frequency.Such as centre frequency is f0The anolog TV signals of MHz, the carrier frequency point of picture-and-sound
It Wei not fc1=(f0- 2.75) MHz and fc2=(f0+ 3.75) MHz, it is similar according to the cyclostationarity of simulated television, in f
α=± 2f of=0 circulation spectral cross sectionc1With α=± 2fc2There are peak points, i.e. highest spectral line and time high spectral line at place.If with highest and
Secondary high spectral line is as characteristic value, then it is estimated that the carrier frequency of detected analog television broadcast signal, so as into
One step determines frequency range belonging to carrier wave by inquiry tv channel frequency division table.
Therefore, based on the above principles, the channel search module 13 first searches for broadcast television signal f=0's to be detected
Maximum in Cyclic Spectrum sectional view positive axisAnd determine the maximumThe serial number k of corresponding broadcast television signal,
It is based on formula again:Determine the carrier frequency of broadcast television signal to be detected, and further by looking into
Tv channel frequency division table is ask to be matched.If detecting the frequency than certain centre frequency f in table of frequency allocations in matching0Closely
Like high 3.75MHz, then searched for again by same procedureSecond largest value corresponding to carrier frequency, if frequency ratio f0Closely
Like low 2.75MHz, then can further judge in table of frequency allocations, the f0For the centre frequency of measured signal, according to DS13~
The frequency range information of DS4836 channel, it may be determined that frequency range belonging to carrier wave.
Preferably, the sensory perceptual system 1 can also further comprise: signal identification module 14, as shown in Figure 2.
The signal identification module 14 is to the identification between anolog TV signals and digital television signal.
Specifically, the signal identification module 14 reads carrier information from channel search module 13, if only reading 1 load
Wave frequency rate information judges measured signal then for digital television signal, if reading 2 carrier wave frequency informations, judges tested letter
Number be anolog TV signals.
As shown in figure 3, the present invention provides a kind of broadcast television signal real-time perception method based on MATLAB GUI.Its
In, the method comprising the steps of S1, S2 and S3 is mainly completed by aforementioned sensory perceptual system.
In step sl, the sensory perceptual system obtains broadcast television signal to be detected.
For example, obtained in the equipment that the sensory perceptual system is connected as the USB interface of the computer equipment belonging to itself to
The broadcast television signal of detection, and be loaded into the MATLAB GUI platform belonging to itself.
Preferably, if obtain broadcast television signal to be detected be binary signal, the sensory perceptual system by two into
Broadcast television signal processed is converted to 10 system broadcast television signals, so as to subsequent processing.
Then, in step s 2, it is special to carry out cyclo-stationary to the broadcast television signal to be detected for the sensory perceptual system
Sign detection, to determine whether tested frequency range is occupied.
Specifically, the sensory perceptual system judges whether have authorization to believe in DTMB/CMMB to be detected based on following manner
Number:
CIThe spectral correlative coefficient for indicating tested point, if CI> CTH, H1Indicate authorization signal presence；If CI≤CTH, H0It indicates
Tested frequency range is unoccupied；Wherein, CTHIt is explained in aforementioned frequency spectrum sensing module, therefore this will not be detailed here.
Then, in step s3, when tested frequency range is occupied, the sensory perceptual system is carried based on circulation spectrum correlation
Wave estimation, and frequency range belonging to estimated carrier wave is determined based on the tv channel frequency division information prestored.
Specifically, the sensory perceptual system first searches for the Cyclic Spectrum sectional view positive axis of broadcast television signal f=0 to be detected
On maximumAnd determine the maximumThe serial number k of corresponding broadcast television signal, then it is based on formula:It determines the carrier frequency of broadcast television signal to be detected, and further passes through inquiry television channel
Table of frequency allocations, for example, the frequency range information of DS13~DS4836 channel, to determine carrier wave fcAffiliated frequency range.
Preferably, according to the method for the present invention, can also further comprise: to anolog TV signals and digital television signal it
Between identification.
Specifically, the sensory perceptual system is based on estimated carrier information, for example, if only estimating 1 carrier frequency
Information then judges that measured signal for digital television signal, if estimating 2 carrier wave frequency informations, judges measured signal for mould
Quasi- TV signal.
In conclusion the broadcast television signal real-time perception system and method for the invention based on MATLAB GUI uses
MATLABGUI exploitation and emulation platform perceive skill based on cognitive radio transmitter spectrum under radio and television overlay environment
The data of collected real-time time-domain radiofrequency signal are loaded into the MATLAB GUI platform configured with frequency spectrum perception system by art,
Using 8M as stepping, the channel search and judgement of broadband signal are completed；The MATLAB GUI platform can also be to multi-standard, more tune simultaneously
Mode processed, separate sources live signal identified.So the present invention effectively overcome various shortcoming in the prior art and
Has high industrial utilization value.
The above-described embodiments merely illustrate the principles and effects of the present invention, and is not intended to limit the present invention.It is any ripe
The personage for knowing this technology all without departing from the spirit and scope of the present invention, carries out modifications and changes to above-described embodiment.Cause
This, institute is complete without departing from the spirit and technical ideas disclosed in the present invention by those of ordinary skill in the art such as
At all equivalent modifications or change, should be contained by claim of the invention.
Claims (6)
1. a kind of broadcast television signal real-time perception system based on MATLAB GUI, which is characterized in that described to be based on MATLAB
The broadcast television signal real-time perception system of GUI includes at least:
It insmods, for obtaining broadcast television signal to be detected；
Frequency spectrum sensing module, for carrying out cyclostationary characteristic detection to the broadcast television signal to be detected, to determine quilt
Whether frequency measurement section is occupied；Wherein, determine whether tested frequency range is occupied based on the spectral correlative coefficient of tested point and decision threshold
With, when the spectral correlative coefficient of tested point be greater than decision threshold when, indicate in broadcast singal to be detected with the presence of authorization signal；When
When the spectral correlative coefficient of tested point is less than or equal to decision threshold, indicate that tested frequency range is unoccupied；
Channel search module, it is occupied for working as tested frequency range, carrier estimation is carried out based on circulation spectrum correlation, and based on pre-
The tv channel frequency division information deposited determines frequency range belonging to estimated carrier wave；
Wherein, the channel search module is first searched in the Cyclic Spectrum sectional view positive axis of broadcast television signal f=0 to be detected
MaximumAnd determine the maximumThe serial number k of corresponding broadcast television signal, then be based on:It determines the carrier frequency of broadcast television signal to be detected, and further passes through inquiry TV frequency
Road table of frequency allocations is matched；For spectral density function；Wherein, α is cycle frequency, and x is that Generalized Cyclic is steady
Signal, that is, x (t), fs are sample frequency, and N is signal sampling points；
Identification module reads carrier information from the channel search module and judges if only reading 1 carrier wave frequency information
Measured signal is digital television signal, if reading 2 carrier wave frequency informations, judges measured signal for anolog TV signals.
2. the broadcast television signal real-time perception system according to claim 1 based on MATLAB GUI, which is characterized in that
It is described to insmod further include: converting unit, the binary system broadcast television signal for being loaded onto are converted to 10 systems broadcast electricity
Depending on signal.
3. the broadcast television signal real-time perception system according to claim 1 based on MATLAB GUI, it is characterised in that:
The tv channel frequency division information prestored includes the frequency range information of 36 channels of DS13~DS48.
4. a kind of broadcast television signal real-time perception method based on MATLAB GUI, which is characterized in that described to be based on MATLAB
The broadcast television signal real-time perception method of GUI includes at least:
1) broadcast television signal to be detected is obtained；
2) cyclostationary characteristic detection is carried out to the broadcast television signal to be detected, to determine whether tested frequency range is occupied
With；Wherein, determine whether tested frequency range is occupied based on the spectral correlative coefficient of tested point and decision threshold, when the spectrum of tested point
When related coefficient is greater than decision threshold, indicate in broadcast singal to be detected with the presence of authorization signal；When the spectrum of tested point is related
When coefficient is less than or equal to decision threshold, indicate that tested frequency range is unoccupied；
3) when tested frequency range is occupied, carrier estimation is carried out based on circulation spectrum correlation, and based on the television channel frequency prestored
Rate division information determines frequency range belonging to estimated carrier wave；
Step 3) includes the maximum in the Cyclic Spectrum sectional view positive axis for search for broadcast television signal f=0 to be detected
And determine the maximumThe serial number k of corresponding broadcast television signal, then be based on:It is to be checked to determine
The carrier frequency of the broadcast television signal of survey, and further matched by inquiring tv channel frequency division table；
For spectral density function；Wherein, α is cycle frequency, and x is Generalized Cyclic stationary signal, that is, x (t), and fs is sample frequency, and N is
Signal sampling points；
Carrier information is read, if only reading 1 carrier wave frequency information, judges measured signal for digital television signal, if reading
2 carrier wave frequency informations are got, then judge measured signal for anolog TV signals.
5. the broadcast television signal real-time perception method according to claim 4 based on MATLAB GUI, which is characterized in that
In step 1) further include: the binary system broadcast television signal being loaded onto is converted to 10 system broadcast television signals.
6. the broadcast television signal real-time perception method according to claim 4 based on MATLAB GUI, it is characterised in that:
The tv channel frequency division information prestored includes the frequency range information of 36 channels of DS13~DS48.
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