CN101742275B - Evaluating method and device for a multidiameter fading channel in television broadcasting - Google Patents
Evaluating method and device for a multidiameter fading channel in television broadcasting Download PDFInfo
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Abstract
The invention provides an evaluating method for a multidiameter fading channel in television broadcasting. The method comprises the following steps of: receiving a television signal; extracting signals at the front half row and the back half row of the starting point of the received field-synchronizing signal; comparing the extracted signals with a reference signal 1 which is preset in local, and performing delay evaluation on each diameter of the channel; by evaluating the delay relative to each diameter, performing the amplitude and phase evaluation on each diameter, wherein the reference signal 1 which is preset in local is obtained by the signals at the front half row and the back half row of the starting point of the field-synchronizing signal in the standard signal. The invention can perform multidiameter fading channel evaluation on the analogue television signals without anti-ghost reference signals (GCR), thereby improving the picture quality when the signal is broadcast.
Description
Technical field
The present invention relates to the mobile broadcast technical field, particularly relate to the method for estimation and the device of multidiameter fading channel in a kind of television broadcasting.
Background technology
The ghost image that multidiameter fading channel brought in the television broadcasting disturbs the definition of image and color is sustained damage, and has a strong impact on picture quality.In order to eliminate or obviously to reduce the ghost image in the television broadcasting, the most important thing is to obtain an Exact Number channel model.In order to obtain channel model; A solution of prior art is: with a known anti-ghost reference signal (GCR) along with TV signal is sent together; Detect the distortion of multidiameter fading channel with it; The standard gcr signal of storing in gcr signal that receives and receiver at receiving terminal relatively adopts certain algorithm to estimate the multidiameter fading channel in the television broadcasting.
But in practical application; Have to propose in the television broadcasting standard of some countries (U.S., Canada, Britain etc.) anti-ghost reference signal (GCR) joined in the TV signal and send together, (for example: the PAL-D standard of China) do not comprise anti-ghost reference signal (GCR) and have in the TV signal of some national television broadcasting standards.For existing anolog TV signals, because it normally transmits through wired mode, therefore, the ghost image that multidiameter fading channel brought is not easy to draw attention a little less than disturbing relatively.
Yet,, anolog TV signals are transmitted through the mobile network and broadcast is one and well uses along with the extensive use of mobile TV.Because though the definition of the stability of anolog TV signals and picture is inferior to digital television signal; But a most favourable link of anolog TV signals is to have abundant programme content; And for the user who receives signal; It need not be paid to TV programme, and therefore, the simulation mobile TV is still more popular with users.
But; Do not comprise anti-ghost reference signal (GCR) in the anolog TV signals owing to countries such as for example China; Then when these TV signals are transmitted through the mobile network; Because the interference that multidiameter fading channel brought then can sustain damage to the definition and the color of image, has a strong impact on picture quality; Influence user's viewing experience, even can't watch.
In a word; A technical problem that presses for those skilled in the art's solution at present is exactly: how can be to the anolog TV signals that do not comprise anti-ghost reference signal (GCR); In transmission, carry out the estimation of multidiameter fading channel, the picture quality when playing to improve signal.
Summary of the invention
Technical problem to be solved by this invention provides a kind of anolog TV signals that do not comprise anti-ghost reference signal (GCR) and carries out the estimation of multidiameter fading channel; Can carry out the estimation of multidiameter fading channel to the anolog TV signals that do not comprise anti-ghost reference signal (GCR), the picture quality when playing to improve signal.
In order to address the above problem, the invention discloses the method for estimation of multidiameter fading channel in a kind of television broadcasting, comprising: received television signal; From the TV signal of said reception, extract the signal of the forward and backward hemistich of starting point of the field sync signal that is received; Signal that is relatively extracted and the base reference signal 1 that is preset at this locality carry out the delay in every footpath in the channel and estimate; Foundation is estimated the delay that every footpath of gained is corresponding and is preset at local base reference signal 2, carries out the amplitude and the phase estimation in every footpath; Wherein, saidly be preset at local base reference signal 1 and obtain, saidly be preset at local base reference signal 2 and obtain by the edge of the corresponding line synchronizing signal of standard signal by the forward and backward hemistich signal of field sync signal starting point in the standard signal.
Preferably, before postponing to estimate, also comprise: the TV signal to receiving is carried out filtering.
Preferably, said delay estimating step comprises: be directed against the signal of the forward and backward hemistich of field sync signal starting point that is extracted, carry out difference operation; To being stored in local base reference signal 1, carry out conjugate operation; As input, the associative operation that slides obtains coefficient correlation with the signal after above-mentioned differentiated signal and the conjugation; Obtain the position at the some peak values place of coefficient correlation absolute value through zero passage detection, as the delay in some footpaths in the channel.
Preferably, said amplitude and phase estimation step comprise: according to the every delay that the footpath is corresponding, obtain the margin signal of the rising edge of every footpath correspondence in the line synchronizing signal that is received; Margin signal and the base reference signal 2 that is preset at this locality according to the corresponding rising edge in said every footpath carry out the estimation of every footpath amplitude and phase place through linear regression; Wherein, saidly be preset at local base reference signal 2 and obtain by the edge of the rising edge of line synchronizing signal in the standard signal.
Preferably, said amplitude and phase estimation step also can comprise: according to the every delay that the footpath is corresponding, obtain the margin signal of the trailing edge of every footpath correspondence in the line synchronizing signal that is received; Margin signal and the base reference signal 2 that is preset at this locality according to the corresponding trailing edge in said every footpath carry out the estimation of every footpath amplitude and phase place through linear regression; Wherein, saidly be preset at local base reference signal 2 and obtain by the edge of the trailing edge of line synchronizing signal in the standard signal.
Preferably, said television broadcasting is the PAL-D standard.
Preferably, said TV signal adopts the negative polarity modulation.
According to embodiments of the invention, the estimation unit of multidiameter fading channel in a kind of television broadcasting is also disclosed, comprising:
The first signal extraction module is used for from the TV signal that is received, and extracts the signal of the forward and backward hemistich of starting point of the field sync signal that is received;
Postpone estimation module, be used for comparison signal that extracts and the base reference signal 1 that is preset at this locality, carry out the delay in some footpaths in the channel and estimate; Wherein, saidly be preset at local base reference signal 1 and obtain by the forward and backward hemistich signal of field sync signal starting point in the standard signal;
The amplitude-phase estimation module is used for foundation and estimates every directly corresponding delay of gained and be preset at local base reference signal 2, carries out the amplitude and the phase estimation in every footpath; Wherein, saidly be preset at local base reference signal 2 and obtain by the edge of the corresponding line synchronizing signal of standard signal.
Preferably, before the signal extraction module, also comprise: noise inhibiting wave filter is used for the TV signal that receives is carried out filtering.
Preferably, said delay estimation module comprises:
The difference subspace module is used to be directed against the signal of the forward and backward hemistich of field sync signal starting point that is extracted, and carries out difference operation;
The conjugation submodule is used for carrying out conjugate operation to being stored in local base reference signal 1;
The slip relevant sub-module is used for the signal after above-mentioned differentiated signal and the conjugation as input, and the associative operation that slides obtains coefficient correlation;
The zero passage detection submodule is used for obtaining through zero passage detection the position at the some peak values place of coefficient correlation absolute value, as the delay in some footpaths in the channel.
Preferably, said amplitude-phase estimation module comprises:
Margin signal obtains submodule, and foundation is estimated the every delay that the footpath is corresponding of gained, obtains the margin signal of the rising edge of every footpath correspondence in the line synchronizing signal that is received;
The linear regression submodule is used for margin signal and the base reference signal 2 that is preset at this locality according to the corresponding rising edge in said every footpath, carries out the estimation of every footpath amplitude and phase place through linear regression; Wherein, saidly be preset at local base reference signal 2 and obtain by the edge of the rising edge of line synchronizing signal in the standard signal.
Preferably, said amplitude-phase estimation module also can comprise:
Margin signal obtains submodule, and foundation is estimated the every delay that the footpath is corresponding of gained, obtains the margin signal of the trailing edge of every footpath correspondence in the line synchronizing signal that is received;
The linear regression submodule is used for margin signal and the base reference signal 2 that is preset at this locality according to the corresponding trailing edge in said every footpath, carries out the estimation of every footpath amplitude and phase place through linear regression; Wherein, saidly be preset at local base reference signal 2 and obtain by the edge of the trailing edge of line synchronizing signal in the standard signal.
Compared with prior art, the present invention has the following advantages:
Owing to do not comprise anti-ghost reference signal (GCR) in the anolog TV signals; But in order to carry out the estimation of multidiameter fading channel; Need a reference signal; The inventor of this patent has found one section signal that has similar characteristic with gcr signal as reference signal through scrutinizing the characteristic of each segment signal in the anolog TV signals." this segment standard signal " in " this segment signal " that receiving terminal will receive and receiver, stored then compares, and carries out the estimation of multidiameter fading channel, thereby solved owing to do not comprise GCR, and can't carry out the problem of channel estimating.
In addition, because the delay in every footpath variation is very slow in the multidiameter fading channel, and the amplitude in every footpath and phase change are very fast; Therefore; In a preferred embodiment of the invention, every delay of carrying out some footpaths in the secondary channel estimates that the delay with some footpaths that estimate in every is carried out the estimation of the amplitude and the phase place in every footpath to each row of data; Such mode both can reduce operand, was enough to again satisfy the demands.
Description of drawings
Fig. 1 is a kind of positive polarity modulation waveform schematic representation intention of anolog TV signals;
Fig. 2 extracts from standard signal, the sketch map of the signal (base reference signal 1) of the forward and backward hemistich of field sync signal starting point (negative polarity) on the VSB territory;
Fig. 3 a is on the VSB territory, the time domain specification of base reference signal 1;
Fig. 3 b is on the VSB territory, the frequency domain characteristic of base reference signal 1;
Fig. 4 is the flow chart of steps of the method for estimation embodiment of multidiameter fading channel in a kind of television broadcasting of the present invention;
Fig. 5 is the refinement step flow chart of the delay estimating step in embodiment illustrated in fig. 4;
Fig. 6 is the signal flow diagram of carrying out amplitude and phase estimation in embodiment illustrated in fig. 4;
Fig. 7 is a signal flow diagram how to obtain in the line synchronizing signal that is received the margin signal of the corresponding rising edge in every footpath in embodiment illustrated in fig. 4;
Fig. 8 is the structured flowchart of the estimation unit embodiment of multidiameter fading channel in a kind of television broadcasting of the present invention.
Embodiment
For make above-mentioned purpose of the present invention, feature and advantage can be more obviously understandable, earlier two technical terms that the present invention relates to carried out simple declaration:
Multipath fading: be meant in the communication process of microwave signal, under the multipath situation,, arrive the signal of receiver along different paths, have the variation of different time delay, decay and phase place owing to receive the influence of ground or water-reflected and atmospheric refraction.The mode that the signal that transmits along different paths is sentenced mutual enhancing or inhibition at reception antenna is superimposed and synthesizes the reception signal.Because arriving the signal of mobile portable antennas is not single-pathway, but numerous reflected waves that many paths are come is synthetic.Because electric wave is through the distance different (for example change or the relatively moving of antenna because of transmission medium causes) in each path, thereby the reflected wave that each path is come is different the time of advent, phase place is also just different.A plurality of signals of out of phase superpose at receiving terminal, superpose sometimes and strengthen (direction is identical), superpose sometimes and weaken (in the opposite direction).Like this, the amplitude that receives signal will sharply change, and promptly produce decline.This decline is caused by multipath, so be called multipath fading.
Ghost image: radio television signal through different barrier reflection or scatterings, has formed the image with various different delayed time decay, phase-shift characterisitc in the terrestrial transmission of open circuit.
Below in conjunction with accompanying drawing and embodiment the present invention is done further detailed explanation.
At first " a section have the signal of similar characteristic with gcr signal " that the inventor found and the process thereof to this patent is elaborated.
The anolog TV signals of PAL-D standard will very be gone in transmission and the data of idol row separately transmit, and the field of the strange row of transmission is strange field, and what transmit the idol row is the idol field; The data of a Qi Chang and an even field are interspersed when transmission carries out, a very field and an idol merging broadcast when playing.For example, the television standard of PAL-D standard of China, per second 25 frames, television scan line are 625 lines (OKs), strange preceding, the idol field after.The field frequency of pal television signal is 50 of per seconds, and frame frequency is per second 25 frames (two synthesize a hardwood).
With reference to Fig. 1, show a waveform signal of anolog TV signals.Fig. 1 shows two adjacent field signals, comprises a Qi Chang and an idol field, comprises the data (1-312 is capable to belong to strange, and 313-625 is capable to belong to even) of 625 row altogether, wherein, and the concrete TV signal that curve 101 expressions are carried.
The characteristic of anti-ghost reference signal GCR is that correlation is strong and straight frequency spectrum, solution thinking of the present invention are arranged in interested whole frequency band is exactly to hope in the TV signal that does not comprise GCR, to seek like one section property class that has with GCR signal as reference signal.
Need to prove that shown in Figure 1 is the positive polarity modulation sketch map of TV signal, the negative polarity modulation is extensively adopted in the transmission of television in the whole nation at present in the reality.For the present invention, no matter modulation of said TV signal positive polarity or negative polarity modulation, its principle of obtaining reference signal, delay, amplitude and phase estimation all is identical; In order to practice thrift length, only carry out the description of embodiment below with the negative polarity situation of extensive use.
With reference to Fig. 2, show from standard signal and extract, at vestigial sideband modulation (Vestigial Sideband Transmission, VSB) the signal real part 201 and imaginary part 202 of the forward and backward hemistich of field sync signal starting point (negative polarity) on the territory.The forward and backward hemistich data of field sync signal starting point selected from standard signal are carried out difference operation, and the signal (hereinafter is referred to as base reference signal 1) after the difference is shown in Fig. 3 a and Fig. 3 b.Fig. 3 a shows on the VSB territory, the time domain specification of base reference signal 1 (the forward and backward hemistich signal of field sync signal starting point is through the data after the difference), and Fig. 3 b shows on the VSB territory, the frequency domain characteristic of base reference signal 1.
Can find out from Fig. 3 a and Fig. 3 b, with the difference of the forward and backward hemistich signal of field sync signal starting point (negative polarity) as reference signal, its characteristic and gcr signal similar (correlation strong and in interested whole frequency band, have straight frequency spectrum).
So, in one embodiment of the invention, can be with the forward and backward hemistich signal of the field sync signal starting point of from standard signal, extracting, through storage after the difference operation and receiving terminal this locality, reference signal as a reference.From received signal, also extract the forward and backward hemistich signal of field sync signal starting point then accordingly and it is carried out after the difference; Compare with base reference signal 1; Thereby can estimate the multidiameter fading channel in the television broadcasting, even do not have gcr signal in the TV signal that is received.
With reference to Fig. 4, show the method for estimation embodiment of multidiameter fading channel in a kind of television broadcasting, specifically can may further comprise the steps:
The signal of the forward and backward hemistich of starting point of the field sync signal that step 402, extraction are received;
Specifically how to obtain required base reference signal 1, describe in detail in the specification in front, therefore repeat no more at this.
Though possibly not comprise gcr signal in the TV signal that is received; But through above-mentioned steps; According to self a segment signal in the TV signal as reference signal; Compare with the base reference signal of this locality storage, just can estimate delay, amplitude and phase place of multidiameter fading channel or the like.
For delay, extract the signal and the base reference signal 1 of the forward and backward hemistich of starting point of the field sync signal that is received and compare, estimate the delay of multidiameter fading channel; For amplitude and phase place; Then can be through the every footpath of relatively being extracted corresponding margin signal and the base reference signal 2 that is preset at this locality; Carry out the amplitude and the phase estimation in every footpath, wherein, base reference signal 2 is obtained by the edge of the corresponding line synchronizing signal of standard signal.
Need to prove that local base reference signal 1 can be to extract and be stored in this locality in advance, also can be that the concrete standard signal that postpones temporarily to store from this locality in the estimation obtains.
In a preferred embodiment of the invention; Can estimate in the initial delay of carrying out every footpath of a secondary channel of every field signal of anolog TV signals; Between the capable sync period of every row of anolog TV signals, carry out the amplitude in every footpath of a secondary channel and the estimation of phase place; On every row, utilize delay, amplitude and the phase place of the channel of estimating out that every capable picture signal is carried out equilibrium then, thereby reach the problem of eliminating the anolog TV signals ghost image.In a word, the present invention can estimate delay, amplitude and the phase place of channel more accurately, the ghost image in the picture signal that can significantly reduce to receive.
Preferably, because possibly also there are some noises in received signal, therefore, postponing to estimate also to comprise before the step of the TV signal that receives being carried out filtering.For example; Vestigial sideband (VSB) signal to receiving carries out filtering: luminance carrier is at-2.75MHz in the signal that receives; Luminance carrier is moved on on the 0MHz from-2.75MHz, add the low pass filter (real filter) that suppresses noise then, the passband of this low pass filter is at 2MHz usually; Rejection zone is at 2.2MHz, degree of depth 40dB.
With reference to Fig. 5, the delay estimating step in embodiment illustrated in fig. 4 is described in detail.
Step a, from the signal in received VSB territory, the signal of the forward and backward hemistich of field sync signal starting point of extraction;
Step b, then, the signal to the forward and backward hemistich of field sync signal starting point that is extracted carries out difference operation;
Step c, to being stored in local base reference signal 1, carry out conjugate operation;
Steps d, with the signal after above-mentioned differentiated signal and the conjugation as input, the associative operation that slides obtains coefficient correlation;
Step e, obtain the position at the some peak values place of coefficient correlation absolute value through zero passage detection, as the delay in every footpath in the channel.
Be the signal in the VSB territory that received of being input as of whole process, be output as the delay in every footpath estimating gained, during passed through difference operation, conjugate operation, slip associative operation, operation and zero passage detection operation or the like take absolute value.
The input of associative operation is the difference that receives signal owing to slide, and the complex values of the characteristic of channel that therefore wherein comprises has also been passed through difference, but the delay in every footpath is not changed.So the coefficient correlation that obtains in this way can not be represented the complex values (being amplitude and the phase place on every footpath of channel) of the characteristic of channel, but the position at some peak values place that but can get its coefficient correlation absolute value through zero passage detection is as the delay in every footpath in the channel.
Because the delay in every footpath changes very slowly in the multidiameter fading channel, and the amplitude in every footpath and phase change are very fast, and therefore every (PAL-D standard field frequency 50Hz) delay estimation of carrying out every footpath in the secondary channel gets final product.Can obtain the delay in every footpath in the channel through above method, utilize the delay in the every footpath of estimating out to be expert at and estimate the amplitude and the phase place in every footpath between sync period.
With reference to Fig. 6, show the signal flow diagram of the amplitude of carrying out and phase estimation.Detailed process can comprise:
The TV signal in steps A, reception VSB territory;
Step B, the delay according to the field sync signal of received signal and line synchronizing signal, the some footpaths of being tried to achieve, the edge length that sets obtain in the received line synchronizing signal margin signal of the corresponding rising edge in some footpaths; The concrete associated description that please see subsequent figures 7 for details of how obtaining.
Because in practical application, margin signal is not straight (margin signal has certain width), the signal that therefore need get a segment length is as margin signal, and for example, can preset edge length is 1us.
Step C, according to the margin signal of the corresponding rising edge in said every footpath be preset at local base reference signal 2 (the rising edge edge by corresponding line synchronizing signal in the standard signal obtains), carry out the estimation of every footpath amplitude and phase place through linear regression.The process of concrete linear regression is well known to those skilled in the art, and can comprise conjugate operation, dot product operation (a kind of vector calculation) or the like usually, repeats no more at this.
With reference to Fig. 7, describe the margin signal that how to obtain the rising edge of every footpath correspondence in the line synchronizing signal that is received in detail below.Because the signal on the VSB territory comprises real part and imaginary part, be inconvenient to represent that therefore, in Fig. 7, we describe with the signal after the demodulation as an example with figure.Signal extraction on the VSB territory is similar, just repeats no more at this.
Line synchronizing signal after the demodulation that holding wire 701 expressions are received;
Line synchronizing signal in the composite video signal of holding wire 702 expression standards, for example defined in television standard; Wherein, the top edge 7021 expression sync levels of its holding wire 702, its lower limb 7022 expression blanking levels, the sync level reference value is 100% in the negative polarity, the blanking level reference value is 75%.
Suppose that 3 footpaths are arranged in the channel (every corresponding amplitude and the phase place in footpath is used complex values a1, a2, a3 representes), then
The signal in first footpath of holding wire 703 expressions, its top edge is a1, lower limb is 0.75a1;
The signal in second footpath of holding wire 704 expressions, its top edge is a2, lower limb is 0.75a2;
The signal in the 3rd footpath of holding wire 705 expressions, its top edge is a3, lower limb is 0.75a3.
Holding wire 703,704,705 shown in Fig. 7 is for having increased the signal after the corresponding delay in every footpath.
Concrete, field sync signal in the received signal and line synchronizing signal are carried out resolved detection, obtain required capable sync bit; Then can be according to the delay in the line synchronizing signal that is received 701, the estimated every footpath that obtains and the edge length that sets, obtain in the received line synchronizing signal margin signal 706,707,708 of the corresponding rising edge in every footpath.
Wherein, the margin signal in first footpath of margin signal 706 expressions, the margin signal in second footpath of margin signal 707 expressions, the margin signal in the 3rd footpath of margin signal 708 expressions.The width means edge length of dotted line.
In step B03,, both can know through calculating:
The lower limb of the margin signal of first footpath correspondence 1.
DownFor: 0.75*a1+0.75*a2+0.75a3; Top edge 1.
OnFor: a1+0.75*a2+0.75a3.Wherein, following top edge ratio is 0.75:1 part is a1.
The lower limb of the margin signal of second footpath correspondence 2.
DownFor: a1+0.75*a2+0.75a3; Top edge 2.
OnFor: a1+a2+0.75a3.Wherein, following top edge ratio is that 0.75: 1 part is a2.
The lower limb of the margin signal of second footpath correspondence 3.
DownFor: a1+a2+0.75a3; Top edge 3.
OnFor: a1+a2+a3.Wherein, following top edge ratio is that 0.75: 1 part is a3.
To the every margin signal and the base reference signal 2 that is preset at this locality (the rising edge edge by corresponding line synchronizing signal in the standard signal obtains) that the footpath is corresponding, can obtain the every complex values (comprising amplitude and phase place) that the footpath is corresponding through linear regression.
Because the delay in every footpath changes very slow in the multidiameter fading channel; And the amplitude in every footpath and phase change are very fast; Therefore every (PAL-D standard field frequency 50Hz) carries out the delay estimation in every footpath in the secondary channel; Delay with the every footpath that estimates in every is carried out the estimation of the amplitude and the phase place in every footpath to every row (PAL-D standard line frequency 15625Hz), just is enough to resist the Doppler of 50Hz in the channel.Such mode both can reduce operand, was enough to again satisfy the demands.
In addition, also need to prove, when the amplitude of carrying out and phase estimation, all be that the rising edge with signal is that example describes, and in concrete the application, also can adopt the trailing edge of signal among the top embodiment.For example, concrete amplitude and phase estimation step can comprise: according to the every delay that the footpath is corresponding, obtain the margin signal of the trailing edge of every footpath correspondence in the line synchronizing signal that is received; Margin signal and the base reference signal 2 that is preset at this locality according to the corresponding trailing edge in said every footpath carry out the estimation of every footpath amplitude and phase place through linear regression; Wherein, saidly be preset at local base reference signal 2 and obtain by the edge of the trailing edge of line synchronizing signal in the standard signal.
With reference to Fig. 8, show the estimation unit embodiment of multidiameter fading channel in a kind of television broadcasting, comprising:
The first signal extraction module 801 is used for from the TV signal that is received, and extracts the signal of the forward and backward hemistich of starting point of the field sync signal that is received;
Postpone estimation module 802, be used for carrying out the delay in every footpath in the channel and estimating according to being preset at local base reference signal 1 and the signal that is extracted; Wherein, the said local base reference signal 1 that is preset at obtains for the forward and backward hemistich signal that extracts field sync signal starting point in the standard signal;
Amplitude-phase estimation module 803 is used for carrying out the amplitude and the phase estimation in every footpath according to the every delay that the footpath is corresponding estimating gained.
After using estimation unit of the present invention; Though possibly not comprise gcr signal in the TV signal that is received; But, as reference signal, compare with the base reference signal of this locality storage according to self a segment signal in the TV signal through above-mentioned module; Just can estimate delay, amplitude and phase place of multidiameter fading channel or the like, be fit to very much not have the analog television transmission situation of gcr signal like PAL-D standard etc.
In concrete the application, before the signal extraction module, can also comprise: noise inhibiting wave filter is used for the TV signal that receives is carried out filtering.To filtered TV signal postpone, the estimation of amplitude or phase place, can remove some The noise, improve the accuracy of estimating.
In one that postpones estimation module 802 inner formation example, it can comprise with lower component:
The difference subspace module is used to be directed against the signal of the forward and backward hemistich of field sync signal starting point that is extracted, and carries out difference operation;
The conjugation submodule is used for carrying out conjugate operation to being stored in local base reference signal 1;
The slip relevant sub-module is used for the signal after above-mentioned differentiated signal and the conjugation as input, and the associative operation that slides obtains coefficient correlation;
The zero passage detection submodule is used for obtaining through zero passage detection the position at the some peak values place of coefficient correlation absolute value, as the delay in every footpath in the channel.
In an inner formation example of amplitude-phase estimation module 803, it can comprise with lower component:
Margin signal obtains submodule, is used for obtaining the margin signal of the rising edge of every footpath correspondence in the line synchronizing signal that is received according to the every delay that the footpath is corresponding;
The linear regression submodule; Be used for margin signal and the base reference signal 2 (the rising edge edge by the standard signal line synchronizing signal obtains) that is preset at this locality, carry out the estimation of every footpath amplitude and phase place through linear regression according to the corresponding rising edge in said every footpath.
In another embodiment of the present invention, said amplitude-phase estimation module 803 also can comprise with lower component:
Margin signal obtains submodule, and foundation is estimated the every delay that the footpath is corresponding of gained, obtains the margin signal of the trailing edge of every footpath correspondence in the line synchronizing signal that is received;
The linear regression submodule is used for margin signal and the base reference signal 2 that is preset at this locality according to the corresponding trailing edge in said every footpath, carries out the estimation of every footpath amplitude and phase place through linear regression; Wherein, saidly be preset at local base reference signal 2 and obtain by the edge of the trailing edge of line synchronizing signal in the standard signal.
Each embodiment in this specification all adopts the mode of going forward one by one to describe, and what each embodiment stressed all is and the difference of other embodiment that identical similar part is mutually referring to getting final product between each embodiment.For device embodiment, because it is similar basically with method embodiment, so description is fairly simple, relevant part gets final product referring to the part explanation of method embodiment.
More than to the method for estimation and the device of multidiameter fading channel in a kind of television broadcasting provided by the present invention; Carried out detailed introduction; Used concrete example among this paper principle of the present invention and execution mode are set forth, the explanation of above embodiment just is used for helping to understand method of the present invention and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present invention, the part that on embodiment and range of application, all can change, in sum, this description should not be construed as limitation of the present invention.
Claims (12)
1. the method for estimation of multidiameter fading channel in the television broadcasting is characterized in that, comprising:
Received television signal;
From the TV signal of said reception, extract the signal of the forward and backward hemistich of starting point of the field sync signal that is received;
Signal that is relatively extracted and the base reference signal 1 that is preset at this locality carry out the delay in every footpath in the channel and estimate;
Foundation is estimated the delay that every footpath of gained is corresponding and is preset at local base reference signal 2, carries out the amplitude and the phase estimation in every footpath;
Wherein, saidly be preset at local base reference signal 1 and obtain, saidly be preset at local base reference signal 2 and obtain by the edge of the corresponding line synchronizing signal of standard signal by the forward and backward hemistich signal of field sync signal starting point in the standard signal.
2. method of estimation as claimed in claim 1 is characterized in that, before postponing to estimate, also comprise: the TV signal to receiving is carried out filtering.
3. method of estimation as claimed in claim 1 is characterized in that, said delay estimating step comprises:
Signal to the forward and backward hemistich of field sync signal starting point that is extracted carries out difference operation;
To being stored in local base reference signal 1, carry out conjugate operation;
As input, the associative operation that slides obtains coefficient correlation with the signal after above-mentioned differentiated signal and the conjugation;
Obtain the position at the some peak values place of coefficient correlation absolute value through zero passage detection, as the delay in some footpaths in the channel.
4. like claim 1 or 3 described methods of estimation, it is characterized in that said amplitude and phase estimation step comprise:
According to the every delay that the footpath is corresponding, obtain the margin signal of the rising edge of every footpath correspondence in the line synchronizing signal that is received;
Margin signal and the base reference signal 2 that is preset at this locality according to the corresponding rising edge in said every footpath carry out the estimation of every footpath amplitude and phase place through linear regression;
Wherein, saidly be preset at local base reference signal 2 and obtain by the edge of the rising edge of line synchronizing signal in the standard signal.
5. like claim 1 or 3 described methods of estimation, it is characterized in that said amplitude and phase estimation step comprise:
According to the every delay that the footpath is corresponding, obtain the margin signal of the trailing edge of every footpath correspondence in the line synchronizing signal that is received;
Margin signal and the base reference signal 2 that is preset at this locality according to the corresponding trailing edge in said every footpath carry out the estimation of every footpath amplitude and phase place through linear regression;
Wherein, saidly be preset at local base reference signal 2 and obtain by the edge of the trailing edge of line synchronizing signal in the standard signal.
6. method of estimation as claimed in claim 1 is characterized in that, said television broadcasting is the PAL-D standard.
7. method of estimation as claimed in claim 1 is characterized in that, said TV signal adopts the negative polarity modulation.
8. the estimation unit of multidiameter fading channel in the television broadcasting is characterized in that, comprising:
The first signal extraction module is used for from the TV signal that is received, and extracts the signal of the forward and backward hemistich of starting point of the field sync signal that is received;
Postpone estimation module, be used for comparison signal that extracts and the base reference signal 1 that is preset at this locality, carry out the delay in some footpaths in the channel and estimate; Wherein, saidly be preset at local base reference signal 1 and obtain by the forward and backward hemistich signal of field sync signal starting point in the standard signal;
The amplitude-phase estimation module is used for foundation and estimates every directly corresponding delay of gained and be preset at local base reference signal 2, carries out the amplitude and the phase estimation in every footpath; Wherein, saidly be preset at local base reference signal 2 and obtain by the edge of the corresponding line synchronizing signal of standard signal.
9. estimation unit as claimed in claim 8 is characterized in that, before the signal extraction module, also comprise: noise inhibiting wave filter is used for the TV signal that receives is carried out filtering.
10. estimation unit as claimed in claim 8 is characterized in that, said delay estimation module comprises:
The difference subspace module is used to be directed against the signal of the forward and backward hemistich of field sync signal starting point that is extracted, and carries out difference operation;
The conjugation submodule is used for carrying out conjugate operation to being stored in local base reference signal 1;
The slip relevant sub-module is used for the signal after above-mentioned differentiated signal and the conjugation as input, and the associative operation that slides obtains coefficient correlation;
The zero passage detection submodule is used for obtaining through zero passage detection the position at the some peak values place of coefficient correlation absolute value, as the delay in some footpaths in the channel.
11., it is characterized in that said amplitude-phase estimation module comprises like claim 8 or 10 described estimation units:
Margin signal obtains submodule, and foundation is estimated the every delay that the footpath is corresponding of gained, obtains the margin signal of the rising edge of every footpath correspondence in the line synchronizing signal that is received;
The linear regression submodule is used for margin signal and the base reference signal 2 that is preset at this locality according to the corresponding rising edge in said every footpath, carries out the estimation of every footpath amplitude and phase place through linear regression;
Wherein, saidly be preset at local base reference signal 2 and obtain by the edge of the rising edge of line synchronizing signal in the standard signal.
12., it is characterized in that said amplitude-phase estimation module comprises like claim 8 or 10 described estimation units:
Margin signal obtains submodule, and foundation is estimated the every delay that the footpath is corresponding of gained, obtains the margin signal of the trailing edge of every footpath correspondence in the line synchronizing signal that is received;
The linear regression submodule is used for margin signal and the base reference signal 2 that is preset at this locality according to the corresponding trailing edge in said every footpath, carries out the estimation of every footpath amplitude and phase place through linear regression;
Wherein, saidly be preset at local base reference signal 2 and obtain by the edge of the trailing edge of line synchronizing signal in the standard signal.
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295402A (en) * | 1999-10-26 | 2001-05-16 | 汤姆森特许公司 | Phase error estimation method for demodulator in high-definition TV receiver |
| CN1691657A (en) * | 2004-01-19 | 2005-11-02 | 三星电子株式会社 | Apparatus and method for carrier acquisition of vestigial sideband (vsb) signal |
| WO2005122573A1 (en) * | 2004-06-05 | 2005-12-22 | Samsung Electronics Co., Ltd. | Digital broadcasting transmission/reception system utilizing srs and trs code to improve receiving performance and signal processing method thereof |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1295402A (en) * | 1999-10-26 | 2001-05-16 | 汤姆森特许公司 | Phase error estimation method for demodulator in high-definition TV receiver |
| CN1691657A (en) * | 2004-01-19 | 2005-11-02 | 三星电子株式会社 | Apparatus and method for carrier acquisition of vestigial sideband (vsb) signal |
| WO2005122573A1 (en) * | 2004-06-05 | 2005-12-22 | Samsung Electronics Co., Ltd. | Digital broadcasting transmission/reception system utilizing srs and trs code to improve receiving performance and signal processing method thereof |
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