CN106357567B - Channel estimation and equalization method under 595 mode of DTMB system PN frame head - Google Patents
Channel estimation and equalization method under 595 mode of DTMB system PN frame head Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/0202—Channel estimation
- H04L25/024—Channel estimation channel estimation algorithms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
- H04L25/03006—Arrangements for removing intersymbol interference
- H04L25/03012—Arrangements for removing intersymbol interference operating in the time domain
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Abstract
The present invention discloses a kind of channel estimation and equalization method under 595 mode of DTMB system PN frame head, it includes following steps: (1) from the time-domain signal under 595 mode of DTMB system PN frame head compensated by Domain Synchronous, frequency deviation, frame time domain data in acquisition data segment r, r comprising 2 PN frame head pn1, pn2 and between the two；(2) one section is respectively intercepted at pn1, pn2 in time domain data section r, and local PN sequence same location, obtains channel time domain shock response h1 and h2 using frequency domain least-squares algorithm, and take mean value to obtain channel time domain shock response mean value h1 and h2It is rightTime-domain filtering is carried out to denoise to obtain channel time domain shock response final value h；(3) data that a segment length is 4375 are intercepted from time domain data section r, carry out frequency domain equalization using the time domain impulse response final value h obtained in (2) step, it can be correct balanced to body data progress is received.Under 595 mode of DTMB system PN frame head, the present invention can be accurately to data progress equilibrium be received, and computation complexity is low, realizes simple.
Description
Technical field
A kind of frame head the present invention relates to channel estimation methods, in particular in a kind of received terrestrial digital broadcasting television system
Channel estimation and equalization method under PN595 mode.
Background technique
DTMB system is China Digital TV standard (GB20600-2006, abbreviation DTMB, the full name of in August, 2006 publication
Digital Television Terrestrial Multimedia Broadcasting, digital multimedia broadcasting-ground state
Family's digital TV broadcast standards).
DTMB uses TDS-OFDM (time-domain synchronization OFDM) modulation system of innovation.DTMB is to improve letter
Road capacity is made without pilot tone using the PN sequence of special designing, fills OFDM protection interval for synchronization signal, realizes synchronization
High efficiency, be also used for channel estimation.
DTMB is made of PN frame head and body data.Wherein there are three types of modes for PN frame head: PN420, PN595, PN945, frame
Volume data is all made of 3780 symbols.Wherein frame head PN420 and frame head PN945 sequence meet period PN correlation properties, lead to
Channel estimation is carried out frequently with data and local PN sequence correlation method is received；And frame head PN595 using 10 rank maximum length puppets with
Machine binary sequence truncates, and the length of header signal is 595 symbols, before being the pseudo-random sequence that length is 1023
595 chips can not constitute a complete periodic PN sequence, generally use time domain approach and carry out channel estimation.
It is general to carry out time domain equalization using time domain PN sequence in PN595 mode, PN sequence is generallyd use as training sequence
Column carry out channel estimation using time domain transverse direction filter extraction procedure, can also carry out channel estimation using using time domain cyclic prefix code,
As patent " channel estimating apparatus and method based on time domain pilot sequence " and patent " carry out channel estimation using cyclic prefix code
Method and apparatus ", wherein
Chinese invention patent application prospectus (101997790 A of CN) " was based on disclosed on March 30th, 2011
The channel estimating apparatus and method of time domain pilot sequence " it, using PN sequence as training sequence, carries out time domain and laterally filters: according to estimating
The tap of the speed adjust automatically self-adaptive filters in time area device for the channel variation counted out updates step-length；Estimate time domain pilot sequence
Channel response；Subtract each other to obtain using the tap filtering summation operation result that local PN sequence and self-adaptive filters in time area device export
Evaluated error, and the error updated as the tap of self-adaptive filters in time area device；Recover the channel response value of present frame.It is led
Deficiency is wanted to be:
1, practical DTMB wireless transmission channel has very high order, in order to obtain more accurately channel estimation, adaptive
Transversal filter is answered to need very more number of taps, at least number of taps usually with twice maximum delay extension diameter,
Which results in adaptive transversal filters, and long time to be needed to can be only achieved convergence, while considerably increasing reception system
Complexity.
Chinese invention patent application prospectus (101958856 A of CN) " utilization disclosed on January 26th, 2011
The method and apparatus of cyclic prefix code progress channel estimation ", which includes first cyclic prefix code and training sequence from receiving
Data in, obtain cyclic prefix in the data for being not affected by other data multi-path jammings, other data multipaths will be not affected by and done
The data of the data and its corresponding position in the training sequence disturbed merge, the training sequence after being reconstructed, finally
Channel estimation is carried out using the training sequence after reconstruct.Its main deficiencies are: due to not deposited under DTMB system PN595 mode
It, cannot directly with this method in time domain cyclic prefix.But it can be utilized using it and be not affected by other data multi-path jammings
Data carry out channel estimation thought, in DTMB system frame head mode PN595, using receive PN sequence in without by
Data to other data multi-path jammings carry out channel estimation, but simultaneously because the equilibrium of body data be it is balanced in frequency domain,
Need most selection it is appropriate without the PN data segment by other data multi-path jammings, both do not done by other data segments
It disturbs, carries enough frequency domain informations as far as possible again.
Emit signal in transmission process, also suffer from the influence of noise, takes time domain denoising factor denoising appropriate (will
The lesser diameter zero setting of energy in channel impulse response h) influence of the noise to Demodulation Systems precision can be effectively reduced.Chinese invention
Patent application prospectus (102223323 A of CN) " DTMB system and its multicarrier disclosed on October 19th, 2011
Channel estimation methods in DTMB ", letter is obtained by related to locally associated sequence since receiving the specific position of signal frame
Then the time domain impulse response of road estimation eliminates noise and interference to time domain shock response progress time domain denoising leakage processing,
It obtains and accurately estimates channel time domain shock response, but this method Shortcomings:
1, when carrying out time-domain filtering denoising to time domain shock response, not under different Q AM modulation system, setting is not
Same time domain denoises the factor, causes time domain denoising effects bad；
Emit signal in transmission process, due to the presence of multipath channel, intersymbol interference i.e. smearing can be brought, referring to
Fig. 7.Fig. 7 a is the signal schematic representation sent, includes two PN frame heads and a body data, Fig. 7 b is two PN frame heads, frames
For data by multi-path influence schematic diagram, Fig. 7 c is the signal schematic representation by multi-path influence being an actually-received.It can be seen by figure
Out, can be interfered with each other between two PN frame heads, body data, this interference can seriously affect data balancing precision, eliminate frame head,
The accuracy that can greatly improve channel estimation and equalization is interfered with each other between frame.Frame head, frame are eliminated in DTMB system
Interfering with each other between body, the main method using reconstruct body data, as patent " TDS-OFDM channel estimation balancing method and
System ".
Chinese invention patent application prospectus (104394105 A of CN) " TDS- disclosed on March 4th, 2015
OFDM channel estimation balancing method and system ", it is to be handled by the data portion to current information frame, is eliminated with obtaining
The data time-domain signal s1 of the hangover interference of the frame head of current information frame, then recycles the frequency response of acquisition to data time domain
Signal s1 carries out frequency domain equalization, to obtain data symbol sequence, this method Shortcomings:
1, this method needs the data portion of reconfiguration information frame, and process is comparatively laborious, needs at least 2 times progress convolution fortune
It calculates, at least 4 454 Fourier transformations, at least 2 4375 FFT transform, 4375 complex divisions, operation is complicated.
At DTMB system frame head mode PN595, since in this mode, PN preamble sequence is the same, it can incite somebody to action
It is considered as the cyclic prefix for protection interval in ofdm system, and then is disappeared using the method based on ofdm system cyclic prefix
Except intersymbol interference, this method does not need the data portion of complicated reconfiguration information frame, it is only necessary to 2 4375 FFT transform, one
Secondary 4375 complex divisions can be realized.
Summary of the invention
For posed problems above, the present invention proposes the channel estimation side under a kind of DTMB system, frame head PN595 mode
Method using intercepting suitable one section of progress channel estimation from the PN sequence received, and has selected to be suitable for different Q AM to modulate
Time domain under mode removes dryness factor removal noise and interference, is finally used again in balance stage based on ofdm system cyclic prefix
Method eliminate it is intersymbol interfere with each other, the frame signal that receives under 595 mode of DTMB system PN frame head can be carried out
It is fast and accurately balanced.
This invention takes following technical solutions: the channel estimation and equalization method under 595 mode of DTMB system PN frame head,
It is comprised the following steps that
Step 1, it from the time-domain signal under 595 mode of DTMB system PN frame head compensated by Domain Synchronous, frequency deviation, obtains
Data segment r is taken, r length is 4970.Comprising 2 PN frame head data pn1, pn2 and when frame between the two in the data segment r
Numeric field data, the length of PN frame head data pn1, pn2 are l1, and the length of frame time domain data is l2, wherein l1=595, l2=
3780；
Step 2, same using local pseudo-random binary sequence device generation local PN595 frame head data pn3, pn3 length
For l1；
Step 3, the data that a segment length is N are intercepted from PN frame head data pn1 obtained in step 1, are quick Fu of N point
In leaf transformation obtain frequency domain data PN1；A Duan Du is intercepted from position same in PN frame head data pn2 obtained in step 1
For the data of N, does N point quick Fourier and convert to obtain frequency domain data PN2；The local PN595 frame head data obtained in the step 2
Same position intercepts the data that a segment length is N in pn3, does N point quick Fourier and converts to obtain local frequency domain data PN3；
It is consistent that PN frame head data pn1, pn2, local PN595 frame head data intercept the data method that a segment length is N:
It fetches since the n-th 1 data in frame head data section evidence, comprising the n-th 1 data, until to the n-th 2 data,
N number of data altogether, wherein n1=71, n2=524, N=454；
Step 4, with the frequency domain data PN1 as obtained in step 3, divided by the local frequency domain data as obtained in step 3
PN3 obtains channel frequency response H1, and does N point quick Fourier inverse transformation to channel frequency response H1 and obtain channel time domain
Impulse response h1；
Step 5, with the frequency domain data PN2 as obtained in step 3, divided by the local frequency domain data as obtained in step 3
PN3 obtains channel frequency response H2, and does N point quick Fourier inverse transformation to channel frequency response H2 and obtain channel time domain
Impulse response h2；
Step 6, channel time domain impulse obtained in channel time domain impulse response h1 obtained in step 4 and step 5 is rung
It answers h2 to be averaged, obtains channel time domain impulse response mean value:
Step 7, setting receives time-domain filtering of the signal under different modulating mode and denoises coefficient η, if QAM is signal modulation
Mode, QAM has 4,16,32,64 4 kind of value mode in DTMB system:
Step 8, using from step 7 must to η, to obtaining channel time domain impulse response mean value in step 6Progress when
Domain filtering and noise reduction, obtains channel time domain impulse response final value h, and time-domain filtering denoising is referred to channel time domain impulse response mean valueThe middle lesser diameter zero setting of energy:
Wherein, | | indicate modulo operation,It indicatesThe maximum value of modulus value, i=1,2,3 ..., 454；
Step 9, by zero padding among channel time domain impulse response final value h obtained in step 8 to 4375 length, make at 4375 points
Fast Fourier Transform (FFT) obtains channel frequency response final value H,；
Step 10, the frame time domain data section r obtained in the step 1 comprising 2 PN frame head pn1, pn2 and between the two
In, the data segment s of 4375 length is intercepted, makees 4375 point quick Fouriers and converts to obtain frequency domain data S, 4375 length of interception
Data segment s is one section among time domain data section r, and data segment s is about bilateral symmetry among data segment r；
Step 11, frequency domain data S obtained in step 10 is obtained divided by the channel frequency response final value H obtained in step 9
To the data by frequency domain equalization, take3780 data at middle body data position, as body data equilibrium result.
Compared with prior art, the present invention has following advantageous effects:
1, the appropriate PN sequence not being interfered is selected from the PN sequence received, is transformed to frequency domain, is made
For pilot frequency sequence, and then and one piece of progress channel estimation of local PN sequence, method very simple it is reliable, it is only necessary to from what is received
Suitable PN tract is selected in PN sequence；
2, time-domain filtering denoising is carried out using the specific denoising factor for different Q AM modulation system, makes channel estimation knot
Fruit is more acurrate；
3, the specific frame head structure of PN595 mode is utilized again in body data balance stage, using conduct in ofdm system
The cyclic prefix of protection interval carries out body data equilibrium, does not need complicated body data restructuring procedure, can accurately disappear
Interfering with each other between divided-by symbol, balancing procedure is simply accurate；
Detailed description of the invention
Fig. 1 is disposed of in its entirety flow diagram of the invention.
Fig. 2 is the data segment r schematic diagram comprising 2 PN frame heads, body data.
Fig. 3 is to generate local PN595 preamble sequence shift register structure schematic diagram.
Fig. 4 is that intermediate one section of schematic diagram is intercepted from frame head data.
Fig. 5 is that 4375 length data section s schematic diagrames are intercepted from data segment r.
Fig. 6 is to choose the body data method after frequency domain equalization from the data after the frequency domain equalization of 4375 length
Schematic diagram.
Fig. 7 is the trailing phenomenon schematic diagram that multipath channel causes signal.
Specific embodiment
Clear, complete description is carried out to technical solution of the present invention below in conjunction with attached drawing.
To be with body data frequency domain equalization with the estimation of 595 mode lower channel of DTMB system PN frame head in the following description
Examples illustrate the present invention.It is exemplary by reference to the embodiment that attached drawing describes, for explaining only the invention, and
It is not considered as limiting the invention.
Referring to Fig. 1, the present invention applies the channel estimation and equalization method under a kind of 595 mode of DTMB system PN frame head of example,
The following steps are included:
A is received simultaneously from the time-domain signal under 595 mode of DTMB system PN frame head compensated by Domain Synchronous, frequency deviation
Frame time domain data in storage time domain data section r, data segment r comprising 2 PN frame head data pn1, pn2 and between the two；B,
Channel estimation and local frame head PN sequence are carried out using as frame head data pn1, frame head data pn2, obtains the frequency response of channel；
C carries out frequency domain equalization to body data time-domain signal using frequency response, to obtain data symbol sequence.Specific implementation process
It is as follows:
Step A connects from the time-domain signal under 595 mode of DTMB system PN frame head compensated by Domain Synchronous, frequency deviation
It receives and stores time domain data section r, length 4970.Comprising 2 PN frame head data pn1, pn2 and between the two in data segment r
Frame time domain data, the length of PN frame head data pn1, pn2 are l1, and the length of frame time domain data is l2, wherein l1=
595, l2=3780；Data segment r is referring to fig. 2；
Step B carries out channel estimation and local frame using the frame head pn2 of the frame head pn1 of current information frame, next information frame
Head PN595 sequence, obtains the frequency response of channel.
Specifically, in one embodiment of the invention, step B includes:
S11 generates local PN595 preamble sequence pn3, pn3 length using local pseudo-random binary sequence device and is similarly
l1.The pseudo-random binary sequence is preceding 595 chips for the m-sequence that the length that 10 bit shift registers generate is 1023,
And the sequence is arrived to the mapping of+1 value, " 1 " to -1 value through " 0 ", the pseudo-random binary sequence that original symbol is 0 and 1 is become
The binary sequence for the non-return-to-zero that symbol is 1 and -1, the wherein generator polynomial of the pseudo-random binary sequence are as follows:
G=1+x3+x10
Initial phase are as follows: 0000000001；
The shift register structure of the pseudo-random binary sequence is generated referring to Fig. 3.
S12 intercepts the data that a segment length is N from PN frame head data pn1 obtained in step A, is in quick Fu of N point
Leaf transformation obtains frequency domain data PN1；It is N that one section of degree is intercepted from position same in PN frame head data pn2 obtained in step 1
Data, do N point quick Fourier and convert to obtain frequency domain data PN2；The local PN595 frame head data pn3 obtained in the step 2
In same position intercept the data that a segment length is N, do N point quick Fourier and convert to obtain local frequency domain data PN3, PN frame
The data method that head data pn1, pn2, local PN595 frame head data one segment length of interception are N is consistent, wherein N=454:
Access evidence after 71 data of frame head data Duan Zhong includes the 71st data, until to the 524th number
According to 454 data, are followed the example of referring to fig. 4 altogether.
S13, with the frequency domain data PN1 as obtained in step s12 divided by local frequency domain data PN3, obtain channel frequency and ring
Answer H1.
S14 does N point quick Fourier inverse transformation to the channel frequency response H1 as obtained in step s13 and obtains channel
Time domain impulse response h1.
S15, with the frequency domain data PN2 as obtained in step s12 divided by local frequency domain data PN3, obtain channel frequency and ring
Answer H2.
S16 does N point quick Fourier inverse transformation to the channel frequency response H2 as obtained in step s15 and obtains channel
Time domain impulse response h2.
S17, to the channel time domain impulse response h1 as obtained in step S14 and the channel time domain as obtained in step S16
Impulse response h2 is averaged, and obtains channel time domain impulse response mean value
S18 sets system time-domain filtering and denoises coefficient η, QAM modulation side in DTMB system according to system qam mode
Formula has 4,16,32,64 4 kind of qam mode:
S19, using from step S18 must to time-domain filtering denoise coefficient η, to channel time domain obtained in step S17
Impulse response mean valueCarry out time-domain filtering denoising, obtain channel time domain impulse response final value h, time-domain filtering denoising refer to by
Channel time domain impulse response mean valueThe middle lesser diameter zero setting of energy:
Wherein, | | indicate modulo operation,It indicatesThe maximum value of modulus value, i=1,2,3 ..., 454.
S20, the channel time domain impulse response final value h zero padding as obtained in step S19 to 4375 length, 4375 points of work are quick
Fourier transformation obtains channel frequency response final value H, and zero padding method is the interposition benefit in channel time domain impulse response final value h
3921 zero.
Step C carries out frequency domain equalization to body data time-domain signal using the frequency response obtained in S19 in step B,
To obtain data symbol sequence.
Specifically, in one embodiment of the invention, step C includes:
S21, from the frame time domain data section r obtained in step 1 comprising 2 PN frame head pn1, pn2 and between the two,
The data segment s of 4375 length is intercepted, makees 4375 point quick Fouriers and converts to obtain frequency domain data S, intercept the data of 4375 length
Section s method is as follows:
It is taken since the n-th 3 data in frame time domain data section r comprising 2 PN frame head pn1, pn2 and between the two
Data, comprising the n-th 3 data, until to the n-th 4 data, K data altogether, wherein n3=298, n4=4672, K=
4375,4375 length data section s are intercepted from data segment r referring to Fig. 5.
S22, by frequency domain data S obtained in step S21 divided by the channel frequency response final value obtained in S20 in step B
H obtains the data by frequency domain equalizationIt takes3780 data at middle body data position, as body data equilibrium knot
Fruit, wherein body data refers toIn fetch since the n-th 5 data evidence, comprising the n-th 5 data, until to the n-th 6 numbers
According to, total M data, wherein n5=298, n6=4077, M=3780.Wherein, from the data after the frequency domain equalization of 4375 lengthIn, the body data method after selection frequency domain equalization is referring to Fig. 6.
Claims (1)
1. a kind of channel estimation and equalization method under 595 mode of DTMB system PN frame head, which is characterized in that key step is such as
Under:
Step 1, from the time-domain signal under 595 mode of DTMB system PN frame head compensated by Domain Synchronous, frequency deviation, number is obtained
According to section r, r length is 4970；Frame time domain number in the data segment r comprising 2 PN frame head data pn1, pn2 and between the two
According to the length of PN frame head data pn1, pn2 is l1, and the length of frame time domain data is l2, wherein l1=595, l2=3780；
Step 2, local PN595 frame head data pn3, pn3 length is generated using local pseudo-random binary sequence device be similarly l1；
Step 3, the data that a segment length is N are intercepted from PN frame head data pn1 obtained in step 1, do N point quick Fourier
Transformation obtains frequency domain data PN1；It is N's that one section of degree is intercepted from position same in PN frame head data pn2 obtained in step 1
Data do N point quick Fourier and convert to obtain frequency domain data PN2；From local PN595 frame head data pn3 obtained in step 2
Same position intercepts the data that a segment length is N, does N point quick Fourier and converts to obtain local frequency domain data PN3；PN frame head
It is consistent that data pn1, pn2 and local PN595 frame head data pn3 intercept the data method that a segment length is N:
It fetches since the n-th 1 data in frame head data section evidence, comprising the n-th 1 data, until to the n-th 2 data, altogether
N number of data, wherein n1=71, n2=524, N=454；
Step 4, it is obtained with the frequency domain data PN1 as obtained in step 3 divided by the local frequency domain data PN3 as obtained in step 3
To channel frequency response H1, and N point quick Fourier inverse transformation is done to channel frequency response H1 and obtains channel time domain impulse sound
Answer h1；
Step 5, it is obtained with the frequency domain data PN2 as obtained in step 3 divided by the local frequency domain data PN3 as obtained in step 3
To channel frequency response H2, and N point quick Fourier inverse transformation is done to channel frequency response H2 and obtains channel time domain impulse sound
Answer h2；
Step 6, to channel time domain impulse response h2 obtained in channel time domain impulse response h1 obtained in step 4 and step 5
It is averaged, obtains channel time domain impulse response mean value
Step 7, setting receives time-domain filtering of the signal under different modulating mode and denoises coefficient η, if QAM is signal modulation side
Formula, QAM has 4,16,32,64 4 kind of value mode in DTMB system:
Step 8, using the η obtained in the step 7, time-domain filtering is carried out to channel time domain impulse response mean value h is obtained in step 6
Denoising, obtains channel time domain impulse response final value h, and time-domain filtering denoising is referred to energy in channel time domain impulse response mean value h
Measure lesser diameter zero setting:
Wherein, | | indicate modulo operation,It indicatesThe maximum value of modulus value, i=1,2,3 ..., 454；
Step 9, by zero padding among channel time domain impulse response final value h obtained in step 8 to 4375 length, 4375 points of work is quick
Fourier transformation obtains channel frequency response final value H；
Step 10, from the frame time domain data section r obtained in step 1 comprising 2 PN frame head pn1, pn2 and between the two,
The data segment s of 4375 length is intercepted, makees 4375 point quick Fouriers and converts to obtain frequency domain data S, the number of 4375 length of interception
It is one section among time domain data section r according to section s, data segment s is about bilateral symmetry among data segment r；
Step 11, by frequency domain data S obtained in step 10 divided by the channel frequency response final value H obtained in step 9, obtain through
Cross the data of frequency domain equalizationIt takesIn 3780 data since the 298th data, include the 298th data, i.e., this 3780
A data are body data equilibrium result.
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| CN102223323A (en) * | 2010-04-16 | 2011-10-19 | 深圳国微技术有限公司 | DTMB (Digital Television Terrestrial Multimedia Broadcasting) system and channel estimation method in multi-carrier DTMB |
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| CN101330482A (en) * | 2007-06-18 | 2008-12-24 | 卓胜微电子（上海）有限公司 | Method for implementing rapid channel estimation using FWT in DMB-T system |
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