CN106330615B - Received terrestrial digital broadcasting TV signal physics layer bandwidth determination method based on occupied bandwidth measurement - Google Patents
Received terrestrial digital broadcasting TV signal physics layer bandwidth determination method based on occupied bandwidth measurement Download PDFInfo
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Abstract
The present invention provides a kind of received terrestrial digital broadcasting TV signal physics layer bandwidth determination methods based on occupied bandwidth measurement.May determine that by emulation experiment measure 99% power accounting centre frequency two sides bandwidth almost can after include that signal main lobe is wide, therefore carry out the sampling to ground digital broadcasting-television signal base band time domain signal first using the method；Then frequency domain data is converted into ground digital broadcasting-television signal base band time domain sampled data and calculates 0.8BwBandwidth general power；Then 99% power accounting bandwidth is calculated in two stages, and the first stage fast and effeciently positions the approximate location of left and right sides power accounting 0.5% to Concourse Division；Second stage carries out accurately positioning the start-stop position for finding accounting bandwidth in minizone；The last physical layer bandwidth mode that received terrestrial digital broadcasting TV signal is judged according to the bandwidth value measured.
Description
Technical field
The present invention relates to digital broadcasting divisions, and for received terrestrial digital broadcasting TV signal, there are many physics layer bandwidths, propose
A kind of received terrestrial digital broadcasting TV signal physics layer bandwidth determination method based on occupied bandwidth measurement.
Background technique
Digital processing technology obtains greatly success, phase along with the high speed development of computer technology and image processing techniques
Compared with simulated television, DTV can provide better program quality and more preferably audiovisual experience for consumer.Generally, ground number
Word broadcast television signal physics layer bandwidth has different modes.As ground digital television broadcast (DVB) standard be at present in the world
The most mature digital television transfer standard of most widely used, technology, using the OFDM modulation (C- of channel coding
OFDM) technology.The basic cycle T of DVB-T signal, corresponding sample frequency are 1/T, are for 8MHz channel basic cycle T
7/64 μ s is 1/8 μ s for 7MHz channel T, is 7/48 μ s for 6MHz channel T, is 7/40 μ s for 5MHz channel T.China
Mobile multimedia broadcasting (CMMB) physics layer bandwidth includes 8MHz and 2MHz.And signal energy has focused largely on main lobe, with
For 8MHz channel DVB-T signal, the roomy about 7.61MHz of ideal frequency spectrum main lobe.
For digital demodulator, receiving end first has to solve the problems, such as to be whether to obtain just with defined sample rate
True sampled signal just can be carried out thereafter correct demodulation.Nowadays in most digital television signal frequency spectrum detection instrument
In, need the bandwidth chahnel of manual setting measured signal parameter, i.e., the physical layer band of received received terrestrial digital broadcasting TV signal
Width, this also means that the digital broadcasting-television signal physics layer bandwidth of transmission need to be known.This, which is undoubtedly increased to user, makes
Use difficulty.Simultaneously for portable signal detecting instrument, it is comparatively relatively more tired that the continuous high-resolution of Yao Shixian sample rate is adjustable
It is difficult.
Chinese invention patent application prospectus (CN 102724000A) " occupancy disclosed on October 10th, 2012
Bandwidth test system and method " it uses in step and calculates occupied bandwidth bigness scale examination and accurate measurement is divided to try two steps, wherein and by test
Frequency range segmentation can adjust the parameter tried for occupied bandwidth bigness scale examination and accurate measurement, the party according to the power and the frequency point
Method Shortcomings:
This method is not accounted in field of digital signals, Frequency point be it is discrete, can exist at start-stop Frequency point non-whole
How more acurrate several the case where are finds out performance number.
Summary of the invention
It is an object of the invention to find a kind of quick and easy physics layer bandwidth for determining received terrestrial digital broadcasting TV signal
Determination method provides a kind of received terrestrial digital broadcasting TV signal physics layer bandwidth determination method based on occupied bandwidth measurement.
To achieve the above object, the present invention provides a kind of received terrestrial digital broadcasting TV signals based on occupied bandwidth measurement
Physics layer bandwidth determination method, this method are measured using occupied bandwidth and quickly find section shared by spectrum signal main lobe, thus
Realize the differentiation of its transmitting physical layer bandwidth.
The present invention includes the sampling to ground digital broadcast television base band time domain data, which is characterized in that including following step
It is rapid:
1, a kind of received terrestrial digital broadcasting TV signal physics layer bandwidth determination method, which comprises the following steps:
Step 1, the received terrestrial digital broadcasting TV signal base band time domain signal for being T to total time span does sample frequency and is
fsSampling, obtain bandwidth be Bw, data volume NallReceived terrestrial digital broadcasting TV signal base band time domain sampled data r, wherein
NallFor received terrestrial digital broadcasting TV signal base band time domain samples sum；
Step 2, adding window is carried out to the base band time domain sampled data r that step 1 obtains and fast discrete Fourier transformation is handled
Become frequency domain data X；
Step 2.1, it chooses window function and windowing process is carried out to base band time domain sampled data r, the formula in this step is as follows:
X (n)=r (n) w (n)
Wherein:
The window function value of w (n) expression nth point；
The base band time domain samples of r (n) expression nth point；
X (n) indicates the base band time domain data sample value after nth point adding window；
Step 2.2, the conversion of fast discrete Fourier transformation is made by step-length K circulation to the base band time domain data sample value after adding window
For frequency domain data X, the formula in this step is as follows:
Wherein:
X (n) indicates the base band time domain data sample value after nth point adding window；
X (k) indicates kth point frequency domain data sample value；
J indicates imaginary unit；
K indicates step-length；
N indicates base band time domain data serial number；
K indicates frequency domain data serial number；
π indicates pi；
Step 3, the total 0.8B in signal center frequency two sides is calculatedwThe total power signal of bandwidth；
Step 3.1, the signal launching centre frequency two sides total B of bandwidth in frequency domain data X is takenwFrequency domain data be denoted as X1, calculate
Centre frequency two sides bandwidth 0.8BwThe initial position d of frequency domain data1With final position d2, initial position d1With final position d2's
Calculation formula is as follows:
Wherein:
Respectively indicate d1With d2It is rounded downwards；
X(d1) indicate in initial position d1The frequency domain data at place estimates sample value；
X(d2) indicate in final position d2The frequency domain data at place estimates sample value；
It indicates in positionThe frequency domain data sample value at place；
It indicates in positionThe frequency domain data sample value at place；
It indicates in positionThe frequency domain data sample value at place；
It indicates in positionThe frequency domain data sample value at place；
Step 3.2, initial position d is calculated1With final position d2Between frequency-region signal general power Psum, formula is as follows:
Wherein:
Ch indicates bandwidth 0.8Bw；
MRBW indicates resolution bandwidth；
Ph indicates power gain value；
Eh indicates to calculate yield value；
Enbw indicates window yield value；
PsumIndicate 0.8BwBandwidth signal general power；
S indicates the sum of frequency domain data amplitude between start-stop position；
X (i) indicates i-th point of frequency domain data sample value；
Step 4, it calculates and accounts for general power Psum99% midbandwidth；
Step 4.1, it calculates and accounts for general power Psum0.5% threshold value Plimit, formula are as follows:
Wherein:
PsumIndicate 0.8BwBandwidth signal general power；
PlimitExpression accounts for general power Psum0.5% threshold value；
Step 4.2, in frequency domain data X1Interior initial position d1With final position d2In range, left and right side function is positioned respectively
Rate is threshold value PlimitApproximate location section, specific practice are as follows: divide step-length K for D group, respectively from left side with initial position d1
Start to the right, right side is with final position d2Start to the left successively by group accumulation calculating performance number P, when performance number P is greater than door for the first time
Limit value PlimitWhen, the class interval being added to is recorded, i.e. positioning PLeftWith PRightSection where substantially, this two sections are denoted as greatly
Cause section A1With A2；The PLeftWith PRightIt respectively indicates and accounts for general power PsumStart stop bit of 99% bandwidth on frequency domain point
It sets；
Step 4.3, it successively calculates respectively from left side initial position d1To the right to substantially section A1Position one by one, right side it is whole
Stop bit sets d2To the left to substantially section A2Position one by one performance number P, find performance number P and be greater than threshold value P for the first timelimit's
Position PLeftWith PRight, i.e. section Z=[PLeft,PRight] interior power accounts for general power Psum99%, conversion bandwidth length BW
It is as follows:
BW=(PRight-PLeft)fs/K
Wherein:
PLeftWith PRightExpression accounts for general power PsumStart-stop position of 99% bandwidth on frequency domain point；
fsIndicate sample frequency；
K indicates fast discrete Fourier transformation step-length；
Step 5, the threshold value that the physics layer bandwidth of terrestrial digital broadcasting signal determines is respectively BW1、BW2、 BW3And BW4,
(0,BW1]、(BW1,BW2]、(BW2,BW3]、(BW3,BW4] and (BW4,+∞) and respectively correspond 2MHz channel, 5MHz channel, 6MHz
The judgement section of channel, 7MHz channel and 8MHz channel, the section that BW is located at can be obtained corresponding transmission signal physical layer band
Wide mode.
Preferably for terrestrial digital broadcasting signal, time-domain signal time span T described in step 1 takes 1ms.
Preferably, K value described in step 2 is 4096.
Preferably, D value described in step 4 is 20.
Preferably, BW described in step 51、BW2、BW3And BW4Respectively value be 3.148MHz, 5.2335MHz,
6.185MHz and 7.135MHz.
Preferably, the base band time domain signal of received terrestrial digital broadcasting TV signal described in step 1 is DVB-T base band time domain
Signal.
Compared with prior art, the beneficial effects of the present invention are: providing a kind of ground number based on occupied bandwidth measurement
Word broadcast singal physical layer bandwidth method, the characteristic of the digital field discrete signal fully considered, while to different physical layer bands
The lower terrestrial digital broadcasting signal time domain data of width is only needed with once compared with high sampling rate 12.5MHz sampling, then
The reusable data make the terrestrial digital broadcasting signal time-domain signal that down-sampled rate conversion is changed into standard sample rate, and
This method is simple and quick to be easily achieved.
Detailed description of the invention
Fig. 1 is basic skills flow diagram of the present invention；
Fig. 2 is the power spectrum chart of DVB-T signal 5MHz channelling mode occupied bandwidth test；
Fig. 3 is the power spectrum chart of DVB-T signal 6MHz channelling mode occupied bandwidth test；
Fig. 4 is the power spectrum chart of DVB-T signal 7MHz channelling mode occupied bandwidth test；
Fig. 5 is the power spectrum chart of DVB-T signal 8MHz channelling mode occupied bandwidth test；
Fig. 6 is finally to demodulate planisphere using the DVB-T signal of the embodiment of the present invention；
Specific embodiment
The embodiment of the present invention is described in further detail with reference to the accompanying drawing.
In embodiment, the input signal of selection is DVB-T base band time domain signal；DVB-T base band time domain signal is sampled
When sample frequency fsTake 12.5MHz, signal bandwidth BwFor 12.5MHz；DVB-T time-domain signal time span T takes 1ms.
Fig. 1 is basic skills flow diagram of the present invention.It may be seen that the invention mainly includes steps:
Step 1, it is adopting for 12.5MHz that the DVB-T base band time domain signal for being 1ms to total time span, which does sample frequency,
Sample, obtaining bandwidth is Bw, data volume NallDVB-T base band time domain sampled data r, wherein NallFor DVB-T base band time domain sample
Value sum.
Step 2, adding window and fast discrete Fourier transformation are carried out to the DVB-T base band time domain sampled data r that step 1 obtains
Processing becomes frequency domain data X.
Step 2.1, it chooses window function and windowing process is carried out to DVB-T base band time domain data r, the formula in this step is such as
Under:
X (n)=r (n) w (n)
Wherein:
The window function value of w (n) expression nth point；
The base band time domain samples of r (n) expression nth point；
X (n) indicates the base band time domain data sample value after nth point adding window；
Step 2.2, the conversion of fast discrete Fourier transformation is made by step-length K circulation to the base band time domain data sample value after adding window
For frequency domain data X, K takes 4096 in the present embodiment, and the formula in this step is as follows:
Wherein:
X (n) indicates the base band time domain data sample value after nth point adding window；
X (k) indicates kth point frequency domain data sample value；
J indicates imaginary unit；
K indicates step-length；
N indicates base band time domain data serial number；
K indicates frequency domain data serial number；
π indicates pi.
Step 3, the total 0.8B in signal center frequency two sides is calculatedwThe total power signal of bandwidth.
Step 3.1, the signal launching centre frequency two sides total B of bandwidth in frequency domain data X is takenwFrequency domain data be denoted as X1, calculate
Centre frequency two sides bandwidth 0.8BwThe initial position d of frequency domain data1With final position d2, initial position d1With final position d2's
Calculation formula is as follows:
Wherein:
Respectively indicate d1With d2It is rounded downwards；
X(d1) indicate in initial position d1The frequency domain data at place estimates sample value；
X(d2) indicate in final position d2The frequency domain data at place estimates sample value；
It indicates in positionThe frequency domain data sample value at place；
It indicates in positionThe frequency domain data sample value at place；
It indicates in positionThe frequency domain data sample value at place；
It indicates in positionThe frequency domain data sample value at place；
Step 3.2, the general power of signal between start-stop position is calculated, formula is as follows:
Wherein:
Ch indicates bandwidth 0.8Bw；
MRBW indicates resolution bandwidth；
Ph indicates power gain value；
Eh indicates to calculate yield value；
Enbw indicates window yield value；
PsumIndicate 0.8BwBandwidth signal general power；
S indicates the sum of frequency domain data amplitude between start-stop position；
X (i) indicates i-th point of frequency domain data sample value.
Step 4, it calculates and accounts for general power Psum99% midbandwidth.
Step 4.1, it calculates and accounts for general power Psum0.5% threshold value Plimit, formula are as follows:
Wherein:
PsumIndicate 0.8BwBandwidth signal general power；
PlimitExpression accounts for general power Psum0.5% threshold value；
Step 4.2, in frequency domain data X1Interior initial position d1With final position d2In range, left and right side function is positioned respectively
Rate is threshold value PlimitApproximate location section, specific practice are as follows: by step-length K point be 20 groups, respectively from left side with initial position
d1Start to the right, right side is with final position d2Start to the left successively by group accumulation calculating performance number P, when performance number P is greater than door for the first time
Limit value PlimitWhen, the class interval being added to is recorded, i.e. positioning PLeftWith PRightSection where substantially, this two sections are denoted as greatly
Cause section A1With A2；The PLeftWith PRightIt respectively indicates and accounts for general power PsumStart stop bit of 99% bandwidth on frequency domain point
It sets；
Step 4.3, it successively calculates respectively from left side initial position d1To the right to substantially section A1Position one by one, right side it is whole
Stop bit sets d2To the left to substantially section A2Position one by one performance number P, find performance number P and be greater than threshold value P for the first timelimit's
Position PLeftWith PRight, i.e. section Z=[PLeft,PRight] interior power accounts for general power Psum99%, conversion bandwidth length BW
It is as follows:
BW=(PRight-PLeft)fs/K
Wherein:
PLeftWith PRightExpression accounts for general power PsumStart-stop position of 99% bandwidth on frequency domain point；
fsIndicate sample frequency；
K indicates fast discrete Fourier transformation step-length.
Step 5, the threshold value that the physics layer bandwidth of terrestrial digital broadcasting signal determines is respectively BW1、BW2、 BW3And BW4,
(0,BW1]、(BW1,BW2]、(BW2,BW3]、(BW3,BW4] and (BW4,+∞) and respectively correspond 2MHz channel, 5MHz channel, 6MHz
The judgement section of channel, 7MHz channel and 8MHz channel, the section that BW is located at can be obtained corresponding transmission signal physical layer band
Wide mode, in the present embodiment, BW1、BW2、BW3And BW4Respectively value be 3.148MHz, 5.2335MHz, 6.185MHz and
7.135MHz。
For the implementation result for verifying the method for the present invention, this judgement DVB-T signal physics layer bandwidth determination method has been carried out
Verifying.
Attached drawing 2 is the 5MHz physical layer bandwidth DVB-T signal occupied bandwidth test in Visual Studio platform building
Power spectrum chart is calculated, and in the case where display bandwidth is 10MHz, ideal main lobe width is 4.76MHz, occupies general power 99%
Frequency range be 4.69MHz, almost enumerate entire channel main lobe portions of bandwidth.
Attached drawing 3 is the 6MHz physical layer bandwidth DVB-T signal occupied bandwidth test in Visual Studio platform building
Power spectrum chart is calculated, and in the case where display bandwidth is 10MHz, ideal main lobe width is 5.71MHz, occupies general power 99%
Frequency range be 5.62MHz, almost enumerate entire channel main lobe portions of bandwidth.
Attached drawing 4 is the 7MHz physical layer bandwidth DVB-T signal occupied bandwidth test in Visual Studio platform building
Power spectrum chart is calculated, and in the case where display bandwidth is 10MHz, ideal main lobe width is 6.66MHz, occupies general power 99%
Frequency range be 6.55MHz, almost enumerate entire channel main lobe portions of bandwidth.
Attached drawing 5 is the 8MHz physical layer bandwidth DVB-T signal occupied bandwidth test in Visual Studio platform building
Power spectrum chart is calculated, and in the case where display bandwidth is 10MHz, ideal main lobe width is 7.61MHz, occupies general power 99%
Frequency range be 7.49MHz, almost enumerate entire channel main lobe portions of bandwidth.
Attached drawing 6 is that can successfully determine DVB-T signal physics layer bandwidth using this method, then in former 12.5M sample rate
In numeric field data, after the conversion of down-sampled rate, become standard sample rate DVB-T time-domain signal, the letter that final unsuccessful demodulation is realized
Number planisphere.
Claims (6)
1. a kind of received terrestrial digital broadcasting TV signal physics layer bandwidth determination method based on occupied bandwidth measurement, feature exist
In, comprising the following steps:
Step 1, it is f that the received terrestrial digital broadcasting TV signal base band time domain signal for being T to total time span, which does sample frequency,s's
Sampling, obtaining bandwidth is Bw, data volume NallReceived terrestrial digital broadcasting TV signal base band time domain sampled data r, wherein Nall
For received terrestrial digital broadcasting TV signal base band time domain samples sum；
Step 2, carrying out adding window and the processing of fast discrete Fourier transformation to the base band time domain sampled data r that step 1 obtains becomes
Frequency domain data X；
Step 2.1, it chooses window function and windowing process is carried out to base band time domain sampled data r, the formula in this step is as follows:
X (n)=r (n) w (n)
Wherein:
The window function value of w (n) expression nth point；
The base band time domain samples of r (n) expression nth point；
X (n) indicates the base band time domain data sample value after nth point adding window；
Step 2.2, fast discrete Fourier transformation is made by step-length K circulation to the base band time domain data sample value after adding window and is converted to frequency
Numeric field data X, the formula in this step are as follows:
Wherein:
X (n) indicates the base band time domain data sample value after nth point adding window；
X (k) indicates kth point frequency domain data sample value；
J indicates imaginary unit；
K indicates step-length；
N indicates base band time domain data serial number；
K indicates frequency domain data serial number；
π indicates pi；
Step 3, the total 0.8B in signal center frequency two sides is calculatedwThe total power signal of bandwidth；
Step 3.1, the signal launching centre frequency two sides total B of bandwidth in frequency domain data X is takenwFrequency domain data be denoted as X1, calculate center
Frequency two sides bandwidth 0.8BwThe initial position d of frequency domain data1With final position d2, initial position d1With final position d2Calculating
Formula is as follows:
Wherein:
Respectively indicate d1With d2It is rounded downwards；
X(d1) indicate in initial position d1The frequency domain data at place estimates sample value；
X(d2) indicate in final position d2The frequency domain data at place estimates sample value；
It indicates in positionThe frequency domain data sample value at place；
It indicates in positionThe frequency domain data sample value at place；
It indicates in positionThe frequency domain data sample value at place；
It indicates in positionThe frequency domain data sample value at place；
Step 3.2, initial position d is calculated1With final position d2Between frequency-region signal general power Psum, formula is as follows:
Wherein:
Ch indicates bandwidth 0.8Bw；
MRBW indicates resolution bandwidth；
Ph indicates power gain value；
Eh indicates to calculate yield value；
Enbw indicates window yield value；
PsumIndicate 0.8BwBandwidth signal general power；
S indicates the sum of frequency domain data amplitude between start-stop position；
X (i) indicates i-th point of frequency domain data sample value；
Step 4, it calculates and accounts for general power Psum99% midbandwidth；
Step 4.1, it calculates and accounts for general power Psum0.5% threshold value Plimit, formula are as follows:
Wherein:
PsumIndicate 0.8BwBandwidth signal general power；
PlimitExpression accounts for general power Psum0.5% threshold value；
Step 4.2, in frequency domain data X1Interior initial position d1With final position d2In range, positioning left and right side power respectively is
Threshold value PlimitApproximate location section, specific practice are as follows: divide step-length K for D group, respectively from left side with initial position d1Start
To the right, right side is with final position d2Start to the left successively by group accumulation calculating performance number P, when performance number P is greater than threshold value for the first time
PlimitWhen, the class interval being added to is recorded, i.e. positioning PLeftWith PRightThis two sections are denoted as substantially area by section where substantially
Between A1With A2；The PLeftWith PRightIt respectively indicates and accounts for general power PsumStart-stop position of 99% bandwidth on frequency domain point；
Step 4.3, it successively calculates respectively from left side initial position d1To the right to substantially section A1Position one by one, right side stop bit
Set d2To the left to substantially section A2Position one by one performance number P, find performance number P and be greater than threshold value P for the first timelimitPosition
PLeftWith PRight, i.e. section Z=[PLeft,PRight] interior power accounts for general power Psum99%, conversion bandwidth length BW such as
Under:
BW=(PRight-PLeft)fs/K
Wherein:
PLeftWith PRightExpression accounts for general power PsumStart-stop position of 99% bandwidth on frequency domain point；
fsIndicate sample frequency；
K indicates fast discrete Fourier transformation step-length；
Step 5, the threshold value that the physics layer bandwidth of terrestrial digital broadcasting signal determines is respectively BW1、BW2、BW3And BW4, (0, BW1]、
(BW1,BW2]、(BW2,BW3]、(BW3,BW4] and (BW4,+∞) and respectively correspond 2MHz channel, 5MHz channel, 6MHz channel, 7MHz
The judgement section of channel and 8MHz channel, the section that BW is located at can be obtained corresponding transmission signal physical layer bandwidth mode.
2. a kind of terrestrial digital broadcasting signal physics layer bandwidth determination method according to claim 1, which is characterized in that right
In terrestrial digital broadcasting signal, sample frequency described in step 1 is fsTake 12.5MHz, bandwidth BwFor 12.5MHz, base band time domain letter
Number time span T takes 1ms.
3. a kind of terrestrial digital broadcasting signal physics layer bandwidth determination method according to claim 1, which is characterized in that step
K value described in rapid 2 is 4096.
4. a kind of terrestrial digital broadcasting signal physics layer bandwidth determination method according to claim 1, which is characterized in that step
D value described in rapid 4 is 20.
5. a kind of terrestrial digital broadcasting signal physics layer bandwidth determination method according to claim 1, which is characterized in that step
BW described in rapid 51、BW2、BW3And BW4Value is 3.148MHz, 5.2335MHz, 6.185MHz and 7.135MHz respectively.
6. a kind of terrestrial digital broadcasting signal physics layer bandwidth determination method according to claim 1, which is characterized in that step
Received terrestrial digital broadcasting TV signal base band time domain signal described in rapid 1 is DVB-T base band time domain signal.
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| US7003100B2 (en) * | 2001-12-10 | 2006-02-21 | Agere Systems Inc. | Modem with enhanced echo canceler |
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