CN1260960C - Channel equalization device in digital TV set - Google Patents
Channel equalization device in digital TV set Download PDFInfo
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- CN1260960C CN1260960C CN 200310105296 CN200310105296A CN1260960C CN 1260960 C CN1260960 C CN 1260960C CN 200310105296 CN200310105296 CN 200310105296 CN 200310105296 A CN200310105296 A CN 200310105296A CN 1260960 C CN1260960 C CN 1260960C
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Abstract
The present invention discloses a channel balancing device of a digital television receiver, which uses the mode of VSB(vestigial side band) modulation. Especially, the channel balancing device exerts favorable performance on not only static channels but also dynamic channels by the method of combining a frequency field balancing part with a time field balancing part, wherein the speed of coefficient update in the time field balancing part is faster than that in the frequency field balancing part; consequently, the problem of slow coefficient update existing in the use of only a frequency field balancing appliance is solved; meanwhile, attenuation or double images which change at a high speed can be normally compensated.
Description
Technical field
The present invention relates to the channel equalisation device of the digital television receiver of a kind of VSB of utilization (vestigial side band) modulation system.
Background technology
Broadcast singal is at the most of digital transmission system that uses at present and at ATSC (the Advanced Television SystemCommittee: Advanced Television Systems Committee) in the 8VSB transfer system that proposes as United States of america digital television (DTV) load mode, by atmospheric radio waves or by as wired channel when transmitting, the signal that digital television receiver is received will be a signal that the multiple reflector of process signal that reflects and the original signal that is transmitted are superimposed.At this moment, because the signal after the reflection will make the original signal distortion, so only can not get original signal with received signal.Wherein, cause the original signal distortion, have ghost image (ghost) or the decay (fading) composition.That is, the physical channel that comprises the digital transmission system of ATSC 8VSB system is a free space.Wherein, the vacuum passage of no medium can be thought desirable., actual transmission signal is to be subjected to air, cloud layer, atmospheric meteorological the variation, or under the influence of the sun, will be via tortuous and multiple propagation path just can be received.
In addition, there is the landform by the chain of mountains, steep cliff, the earth in the path of propagation, the object of forest, building is arranged and the fixing multiple propagation path that reflects, see through, also has the multiple propagation path of the real-time change that the object by aircraft, automobile produces.The propagation of this multi-path owing to identical signal will be passed on through propagation time different separately a plurality of paths, thereby in digital delivery, will cause the maximum reason that causes the high-speed data transmission system function to reduce, i.e. an intersymbol interference.The distorted signals that causes through this multi-path propagation on digital television receiver, will cause that bit detects error, thereby may cause restoring entire image, or show the phenomenon of complete different images.
In order to overcome this phenomenon, on digital television receiver, a kind of equalizer that compensates transmission distorted signals composition (being ghost image or the decay) usefulness that produces between transmission end and the receiving terminal will be used.Equalizer can be divided into time-domain equalizer (time-domain equalizer) and frequency domain equalization device (frequency-domain equalizer), and its effect all is to make original signal produce the composition of distortion with removing.The frequency domain equalization device is extrapolate channel impulse response from time-domain signal after, the channel impulse response of extrapolating to be transformed into frequency domain signal.And because the frequency domain signal of channel distortion becomes desirable frequency domain signal, the coefficient with the territory equalizer that goes to adjust frequency makes it play the effect of correcting distortion in order to make.That is to say,, be transformed into after the frequency domain signal, utilize the frequency domain equalization device to remove the composition of compensate for attenuation the received signal of time-domain.Then, will be for conversion into time-domain signal again again by the frequency domain signal after the compensation.
At this moment, when the signal with decay passes through the frequency domain equalization device, when being compensated, also can remove to amplify noise except that the composition of decaying.So,, also will use noise remover in order to remove the noise that has been exaggerated.Fig. 1 is to use this frequency domain equalization device and noise remover, the composition frame chart of conventional digital TV receiver channel equalisation device.The demodulation section 101 of this device, will be from RF (the Radio Frequency: radio frequency) the signal that receives by antenna, tuningly go out required channel signals, then tuning RF channel signals, be transformed into IF (Intermediate Frequency: signal intermediate frequency), and then the IF signal carried out demodulation by VSB modulation system reverse, then to 102 outputs of frequency domain equalization portion.Frequency domain equalization portion 102 as described in front, will extrapolate the impulse response of channel from time-domain signal, and the channel impulse response of extrapolating, after being transformed into frequency domain signal, remove the compensating distortion composition, then to 103 outputs of noise remove portion by adjusting coefficient.Noise remove portion 103 will be from the output of frequency domain equalization portion 102, removes the noise that has been exaggerated when carrying out equilibrium.
In order to extrapolate channel impulse response, need a known signal from frequency domain equalization portion 102; At this moment will utilize the signal that is equivalent to field synchronization (field sync) as shown in Figure 2 usually.Fig. 2 is the data frame structure figure in the VSB mode digital television receiver.1 frame is made up of 2 fields, and 1 field is made up of 313 data segments.And 1 data segment is made up of 832 symbols again.At this moment, in a data segment, 4 the symbol section of being sync sections, and first data segment in a field is the field synchronization part.That is, as shown in the VSB of Fig. 2 data frame structure, field sync signal will be to occur in the cycle with 24.2ms.So the coefficient of frequency domain equalization portion also upgrades every 24.2ms.Than 24.2ms faster in the channel environment, frequency domain equalization device as shown in Figure 1 can not normally go compensate for attenuation in the variation of a decay.Promptly in a lot of actual environments, decay all changes fast, so as the structure of Fig. 1 composition, can not normally bring into play equalization function.
Summary of the invention
Purpose of the present invention is developed in order to solve the above problems, and first purpose of the present invention provides a kind of channel equalisation device of the digital television receiver that can compensate fast-changing decay (or ghost image); Another object of the present invention provides and a kind ofly gets in conjunction with a time-domain equalizer at the frequency domain equalization device, so as to the channel equalisation device of digital television receiver that fast-changing decay (or ghost image) is compensated.
The object of the present invention is achieved like this, and in order to achieve the above object, the feature of digital television receiver channel equalisation device of the present invention is: be provided with a frequency domain equalization portion; Go again in addition to be provided with one that combine with it and compare update coefficients time-domain equilibrium faster portion with frequency domain equalization portion, make and be not only on the channel of static state, and also can give play to good performance on the channel dynamically.
The 1st example of digital television receiver channel equalisation device of the present invention is combined and is formed by frequency domain equalization portion, noise remove portion and time-domain equilibrium portion.This device has the following structures feature, that is: be provided with a received signal time-domain and be transformed into frequency domain, and in frequency domain the signal that is received is carried out equilibrium, then it is remapped into the frequency domain equalization portion of time-domain signal; Be provided with an output that is connected frequency domain equalization portion, and from the output signal of frequency domain equalization portion, with the noise remove portion that removes the noise that when carrying out frequency domain equalization, has been exaggerated in the lump; Also be provided with an output that is connected noise remove portion, and the output signal of noise remove portion is carried out the time-domain equilibrium, then the time-domain equilibrium portion that the distorted signals that is caused by quick decay is compensated; Also be provided with an output signal of utilizing time-domain equilibrium portion, go to extrapolate will update coefficients be used in time-domain equilibrium portion error, and with the error generating unit of this Error Feedback to time-domain equilibrium portion.
The 2nd example of digital television receiver channel equalisation device of the present invention is combined and is formed by frequency domain equalization portion, noise remove portion and time-domain equilibrium portion.This device has the following structures feature, that is: the output in frequency domain equalization portion is connected to time-domain equilibrium portion; Output in time-domain equilibrium portion is connected to noise remove portion; Between time-domain equilibrium portion and noise remove portion, then be connected to the error generating unit.
The 3rd example of digital television receiver channel equalisation device of the present invention is combined and is formed by frequency domain equalization portion, noise remove portion and time-domain equilibrium portion.This device has the following structures feature, that is: the output in frequency domain equalization portion is connected to time-domain equilibrium portion; Output in time-domain equilibrium portion is connected to noise remove portion and error generating unit; And the output of error generating unit will feed back to time-domain equilibrium portion.
The channel equalisation device effect of digital television receiver of the present invention is that by carry out the method for time-domain equilibrium again after frequency domain equalization, the coefficient update that will be produced in the time of can improving only with the frequency domain equalization device is problem slowly.Thus not only on the channel of static state, and on dynamic channel, also can give play to good performance, therefore can normally compensate fast-changing decay (or ghost image), by above explanation, if professional person, so all as can be known in not breaking away from technological thought scope of the present invention, can carry out numerous variations or correction.And technical scope of the present invention will can not be subjected to the qualification of the content that example puts down in writing, but the claim scope according to patent should be defined.
Description of drawings
The present invention is described in further detail below in conjunction with drawings and Examples.
Fig. 1 is the channel equalisation device composition frame chart of conventional digital TV receiver.
Fig. 2 is the data frame structure figure in the ordinary numbers television receiver.
Fig. 3 is the present invention, i.e. the composition frame chart of digital television receiver channel equalisation device the 1st example.
Fig. 4 is the present invention, i.e. the composition frame chart of digital television receiver channel equalisation device the 2nd example.
Fig. 5 is the present invention, i.e. the composition frame chart of digital television receiver channel equalisation device the 3rd example.
The symbol description of accompanying drawing major part
301,401,501: frequency domain equalization portion
302,403,503: noise remove portion
303,402,502: time-domain equilibrium portion
304,404,504: the error generating unit
Embodiment
By following detailed description, understand all the other purposes of the present invention, feature and advantage with reference to accompanying drawing with will be more readily apparent from.Below, the composition and the effect thereof of example of the present invention are described with reference to accompanying drawing.But, be shown on the accompanying drawing, and, be an example according to the explanation that it is done to composition of the present invention and effect thereof; It will can not go to limit technological thought of the present invention, core texture and effect thereof.
Fig. 3 is the composition frame chart of the digital television receiver channel equalisation device of the present invention's the 1st example.Output in frequency domain equalization portion 301 is connecting noise remove portion 302; The output of noise remove portion 302 is connecting time-domain equilibrium portion 303; The output of time-domain equilibrium portion 303 is connecting error generating unit 304.At this moment, time-domain equilibrium portion 303 with utilizing the output of noise remove portion 302 and the error of error generating unit 304, removes to finish coefficient update, so that go the distorted signals of comfort noise removal portion 302 outputs in time-domain.
In the present invention's the 1st example with above-mentioned composition, frequency domain equalization portion 301 will be from the received signal of the time-domain by demodulation section output, extrapolate the impulse response of channel after, the channel impulse response of extrapolating is transformed into the signal of frequency domain.And, the received signal of time-domain also is transformed into the signal of frequency domain.Then, the channel impulse response by the frequency domain extrapolated and utilize the coefficient update of received signal goes to proofread and correct the distortion that the frequency domain that produces by above-mentioned channel receives letter.Then it is remapped into time-domain signal, and output to noise remove portion 302.Noise remove portion 302 will be from the output signal of frequency domain equalization portion 301, removes the noise that has been exaggerated when equilibrium, outputs to time-domain equilibrium portion 303 then.Time-domain equilibrium portion 303 is to through the frequency domain equalization and the enterprising line time of the signal territory equilibrium of having removed noise, so as to go to compensate the distorted signals that is caused by quick decay of failing to compensate in frequency domain equalization portion 301.
At this moment, the output of time-domain equilibrium portion 303 will be output to error generating unit 304; And error generating unit 304 will be extrapolated the error that will utilize when time-domain equilibrium portion 303 carries out the filter factor renewal from the output of time-domain equilibrium portion 303, and it is fed back to time-domain equilibrium portion 303.Time-domain equilibrium portion 303 utilizes the output of noise remove portion 302 and the error of feedback, and the filter that is provided with n tap in inside is carried out coefficient update, thereby goes to compensate the distorted signals that is caused by quick decay of failing to compensate in frequency domain equalization portion 301.For instance, the filter of 303 pairs of each taps of time-domain equilibrium portion multiply by on the error amount behind the signal of noise remove portion 302 outputs, is added on the former coefficient of each tap, carries out the coefficient update of each tap whereby respectively.And, all taps will be carried out a process that multiply by the output of each tap on the coefficient that has been updated again simultaneously, then, long-pending the adding up that each tap is multiplied each other again, and to add up and carry out amplitude limit.The result of amplitude limit will become the final signal of exporting to error generating unit 304.
For above-mentioned time-domain equilibrium portion 303, can use with field sync period and compare update coefficients faster, comprise common LMS (least mean square: lowest mean square), (recursive least square: recursive least-squares), ZF (zero forcing: force zero) mode is at interior most of the time territory equalizer for RLS.Error generating unit 304, the error that rise time territory equilibrium portion 303 will be used when carrying out coefficient update.In the 1st example of the present invention, be to extrapolate error from the output of time-domain equilibrium portion 303.Calculate that error has several different methods here.Even if utilize well-known technology also harmless.
For instance, when delivery end transmitted a training column signal, error generating unit 304 as error, went to feed back to time-domain equilibrium portion 303 to the difference between the output of time-domain equilibrium portion 303 and the training column signal.Here, the training column signal is exactly from a kind of reference signal that delivery end sends, to be the value of knowing in advance in order to allow receiving system adjust certain function automatically.If do not train column signal, so just the signal that has carried out time equalization, and to the signal that carried out time equalization in addition the difference between the signal of amplitude limit go to feed back to time-domain equilibrium portion 303 as error.As mentioned above, the 1st example of the present invention is successively by frequency domain equalization portion 301, noise remove portion 302, and time-domain equilibrium portion 303 forms.Wherein, the coefficient update error of time-domain equilibrium portion 303 is to utilize to try to achieve via the signal of time-domain equilibrium portion 303.
Fig. 4 is the composition frame chart of the digital television receiver channel equalisation device of the present invention's the 2nd example.This device will adopt to be removed from the signal via frequency domain equalization before the noise, carries out a kind of mode of time-domain equilibrium.As shown in Figure 4, the output in frequency domain equalization portion 401 is connected to time-domain equilibrium portion 402; And be connected to noise remove portion 403 at the output of time-domain equilibrium portion 402.The output of noise remove portion 403 will output to error generating unit 404.The course of work of each one may be identical with the situation of Fig. 3, and is perhaps different.Even if identical also harmless, so will omit detailed explanation.
That is, the channel equalisation device of Fig. 4 between frequency domain equalization portion 401 and noise remove portion 403, is provided with time-domain equilibrium portion 402; Error generating unit 404 is used for the error of territory equilibrium update time portion 402 coefficients in order to try to achieve, with the signal that utilizes via noise remove portion 403.As mentioned above, in the 2nd example of the present invention,, therefore before removing noise, just can remove remaining decay, and then can more effectively finish noise remove work because time-domain equilibrium portion 402 is arranged on the front end of noise remove portion 403.In addition, be used for the error of time-domain equilibrium portion 402,, therefore can try to achieve the more error of high-quality owing to will utilize the signal of having removed noise.
Fig. 5 is the composition frame chart of the digital television receiver channel equalisation device of the present invention's the 3rd example.Different is to go to ask error from the signal that has carried out the time-domain equilibrium with Fig. 4.As shown in Figure 5, the output in frequency domain equalization portion 501 is connecting time-domain equilibrium portion 502; Output in time-domain equilibrium portion 502 is connecting noise remove portion 503; So far, it is identical with Fig. 4.Yet its difference is the output of time-domain equilibrium portion 502, will be output on the error generating unit 504; And this error generating unit is to be used for detecting inner n the error that the tap filter coefficient is used of renewal.In like manner, the course of work of each one may be identical with above-mentioned Fig. 3 situation, and is perhaps different.Even if identical also harmless, so will omit detailed explanation.That is, the channel equalisation device of Fig. 5 between frequency domain equalization portion 501 and noise remove portion 503, is provided with time-domain equilibrium portion 502; Via the signal of time-domain equilibrium portion 502, will be used to ask the error of territory equilibrium update time portion 502 coefficients.
As mentioned above, the present invention will be only with a frequency domain equalization device, and solves by the method that combines with the time-domain equalizer and to carry out traditional renewal speed problem that coefficient update took place when each field synchronization.
Claims (7)
1, a kind of channel equalisation device of digital television receiver, it is characterized in that: be provided with a received signal and be transformed into frequency domain time-domain, and in frequency domain, the signal that is received is carried out equilibrium, then it is remapped into the frequency domain equalization portion of time-domain signal; Be provided with an output that is connected frequency domain equalization portion, and from the output signal of frequency domain equalization portion, with the noise remove portion that removes the noise that when carrying out frequency domain equalization, has been exaggerated in the lump; Also be provided with an output that is connected noise remove portion, and, carry out the time-domain equilibrium, then the time-domain equilibrium portion that the distorted signals that is caused by quick decay is compensated the output signal of noise remove portion; Also be provided with an output signal of utilizing time-domain equilibrium portion, go to extrapolate will update coefficients be used in time-domain equilibrium portion error, and with the error generating unit of this Error Feedback to time-domain equilibrium portion.
2, channel equalisation device according to claim 1, it is characterized in that: frequency domain equalization portion is from the received signal of time-domain, after extrapolating the impulse response of channel, the received signal of channel impulse response of extrapolating and time-domain is transformed into frequency domain signal respectively; Then, the channel impulse response by the frequency domain extrapolated and utilize the coefficient update of received signal goes to proofread and correct the distortion of the frequency domain received signal that produces by above-mentioned channel; Then it is remapped into time-domain signal.
3, channel equalisation device according to claim 1, it is characterized in that: time-domain equilibrium portion utilizes the output of noise remove portion and the error of feeding back from the error generating unit, filter is carried out coefficient update, and go to compensate the distorted signals that causes by quick decay from the output of noise remove portion.
4, channel equalisation device according to claim 1 is characterized in that: the speed of time-domain equilibrium portion update coefficients is faster than field sync period.
5, channel equalisation device according to claim 1, it is characterized in that: time-domain equilibrium portion utilizes LMS (least mean square: lowest mean square), RLS (recursive leastsquare: recursive least-squares), any mode in ZF (zero forcing: the force zero) mode.
6, a kind of channel equalisation device of digital television receiver, it is characterized in that: be provided with a received signal and be transformed into frequency domain time-domain, and in frequency domain, the signal that is received is carried out equilibrium, then it is remapped into the frequency domain equalization portion of time-domain signal; Be provided with an output that is connected frequency domain equalization portion, and the output signal of frequency domain equalization portion is carried out the equilibrium of time-domain, thereby go to compensate the time-domain equilibrium portion of the distorted signals that causes by quick decay; Be provided with an output that is connected time-domain equilibrium portion, and remove the noise that when carrying out equilibrium, has been exaggerated in the lump from the output of time-domain equilibrium portion; Also be provided with an output signal of utilizing noise remove portion, go to extrapolate will update coefficients be used in time-domain equilibrium portion error, and with the error generating unit of this Error Feedback to time-domain equilibrium portion.
7, a kind of channel equalisation device of digital television receiver, it is characterized in that: be provided with a received signal and be transformed into frequency domain time-domain, and in frequency domain, the signal that is received is carried out equilibrium, then it is remapped into the frequency domain equalization portion of time-domain signal; Be provided with an output that is connected frequency domain equalization portion, and the output signal of frequency domain equalization portion is carried out the equilibrium of time-domain, thereby go to compensate the time-domain equilibrium portion of the distorted signals that causes by quick decay; Be provided with an output that is connected time-domain equilibrium portion, and remove the noise that when carrying out equilibrium, has been exaggerated in the lump from the output of time-domain equilibrium portion; Also be provided with an output signal of utilizing time-domain equilibrium portion, go to extrapolate will update coefficients be used in time-domain equilibrium portion error, and with the error generating unit of this Error Feedback to time-domain equilibrium portion.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200310105296 CN1260960C (en) | 2003-12-09 | 2003-12-09 | Channel equalization device in digital TV set |
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| CN 200310105296 CN1260960C (en) | 2003-12-09 | 2003-12-09 | Channel equalization device in digital TV set |
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| CN1627804A CN1627804A (en) | 2005-06-15 |
| CN1260960C true CN1260960C (en) | 2006-06-21 |
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| CN 200310105296 Expired - Fee Related CN1260960C (en) | 2003-12-09 | 2003-12-09 | Channel equalization device in digital TV set |
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| US8953098B2 (en) * | 2010-01-29 | 2015-02-10 | Mediatek Inc. | Television signal processing device and television signal processing method |
| CN101778192B (en) * | 2010-02-25 | 2012-02-01 | 昆山锐芯微电子有限公司 | Image processing method and device |
| CN102006261A (en) * | 2010-12-09 | 2011-04-06 | 北京邮电大学 | Channel estimating method for increasing performance of coherent light communication system |
| CN104301583A (en) * | 2013-07-19 | 2015-01-21 | 深圳市同洲电子股份有限公司 | Automatic loop-out signal adjusting method and system |
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Owner name: NANJING LG XINGANG DISPLAY CO., LTD. Free format text: FORMER OWNER: LG ELECTRONICS (SHENYANG) CO., LTD. Effective date: 20070323 |
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Effective date of registration: 20070323 Address after: 210038 No. 346 Yao Yao Avenue, Nanjing economic and Technological Development Zone, Jiangsu, China Patentee after: LG Electronics Nanjing Display Co., Ltd. Address before: 110179 No. 35, No. 40, hi tech Development Zone, Liaoning, Shenyang Patentee before: LG Electronics (Shenyang) Co., Ltd. |
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