CN100407762C - Apparatus and method for detecting synchronous signal - Google Patents

Apparatus and method for detecting synchronous signal Download PDF

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Publication number
CN100407762C
CN100407762C CN2004100475399A CN200410047539A CN100407762C CN 100407762 C CN100407762 C CN 100407762C CN 2004100475399 A CN2004100475399 A CN 2004100475399A CN 200410047539 A CN200410047539 A CN 200410047539A CN 100407762 C CN100407762 C CN 100407762C
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correlation
signal
unit
digital broadcast
memory
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CN1578394A (en
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郭征元
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Samsung Electronics Co Ltd
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Samsung Electronics Co Ltd
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/04—Synchronising
    • H04N5/08—Separation of synchronising signals from picture signals
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N21/00—Selective content distribution, e.g. interactive television or video on demand [VOD]
    • H04N21/40—Client devices specifically adapted for the reception of or interaction with content, e.g. set-top-box [STB]; Operations thereof
    • H04N21/41—Structure of client; Structure of client peripherals
    • H04N21/426—Internal components of the client ; Characteristics thereof

Abstract

A SYNC(SYNChronization) signal detecting apparatusare provided to detect exactly a SYNC signal from a digital broadcasting signal, including: The first correlator calculates the first correlation value relating to a previously prepared standard pseudo noise (PN) stream information and a real number component of the digital broadcasting signal. The second correlator calculates the second correlation value relating to a previously prepared standard pseudo noise stream information and a complex number component of the digital broadcasting signal. A correlation value calculating member calculates sum about the square values of the first and second correlation values, removes a phase offset having the same phase included to the first and second correlation values and calculates the size of the correlation value relating to the standard pseudo noise stream information and a SYNC(SYNChronization) signal. A maximum value detecting member produces a SYNC detecting signal at the position having the maximum value within a predetermined period among the calculated correlation values. As a result, minimize the impact of phase offset of broadcasting signal from transmitter and efficient detecting of SYNC(SYNChronization) signal can be achieved.

Description

Detect the device and method of synchronizing signal
Technical field
The present invention relates to the device of the detection synchronizing signal in a kind of digital broadcasting signal receiver, be particularly related to a kind of like this device that detects synchronizing signal, even it is because channel disturbance and multipath fading when causing phase change from the digital broadcast signal of transmitter, still can detect synchronizing signal according to main footpath exactly.
Background technology
Digital system has replaced analog broadcast system rapidly.Digit broadcasting system is compared with analog broadcast system, and the more picture quality of high definition can be provided, and, provide various additional functions to a plurality of basic functions of video and audio reproducing.Digital broadcasting mainly is categorized as U.S.'s scheme and European proposal, and U.S.'s scheme is based on ATSC (the Advanced Television Broadcasting standard committee), and European proposal is then based on DVB-T (terrestrial digital television broadcasting).ATSC is by the broadcast singal of single carrier transmission based on MPEG-2 (motion image expert group 2), and DVB-T sends broadcast singal by signal being modulated to a plurality of subcarriers.ATSC is adopted by some countries, and as the U.S., Korea S and Canada, and people understand the advantage of ATSC, for example with analogue system radio hookup situation under, anti-cochannel interference performance is strong, simple hsrdware requirements, low cost.Simultaneously, Samsung Electronics Co., Ltd has proposed ADTB-T (Advanced Digital TelevisionBroadcasting-Terrestrial, the advanced digital television broadcasting in land) recently, and this scheme is similar to ATSC.ADTB-T standard support list/mixed transmission modes adopts OQAM (offset orthogonal amplitude modulation(PAM)) technology to modulate.
Fig. 1 has shown the functional-block diagram that sends and receive in the digital communication.
As shown in Figure 1, transmitter is modulated to carrier frequency (Ae to signal X (t) in modulating unit (10) Jwt), and send signal (Ae Jwt) X (t).The frequency e of receiver with the carrier frequency quadrature -jwtMultiply by the signal (Ae that receives Jwt) X (t), obtain the signal X (t) that transmits.
Fig. 2 has shown the transmission of transmitter and receiver and the block diagram of reception among Fig. 1, has wherein produced channel disturbance.
As shown in Figure 2, if the signal (Ae that transmitter sends Jwt+ θ) X (t) influenced by multipath signal, perhaps disturbed by other contiguous broadcast singals, the phase place that then sends signal will change.Thereby because phase change is phase deviation θ, therefore sending signal becomes (Ae Jwt+ θ) X (t).The receiver frequency e of demodulating unit (20) -jwtMultiply by the signal (Ae that receives Jwt+ θ) X (t), consequently the receiver signal X (t) that can not obtain expecting.Because phase deviation, receiver can not be followed the trail of the position that sends the synchronizing signal among the signal X (t) exactly.As everyone knows, digital broadcast signal comprises the synchronizing signal that is used to refer to transmission signals X (t) beginning and finishes, and this means, if can not find the position of synchronizing signal, will cause normally taking defeat of digital broadcasting signal receiver.
Summary of the invention
The object of the present invention is to provide a kind of scheme that solves above shortcoming and the other problems relevant with legacy equipment.An aspect of of the present present invention provides a kind of device that is used to detect synchronizing signal, even it is owing to cause still can detecting the synchronizing signal in the digital broadcast signal exactly when the signal phase that transmitting terminal receives changes as problems such as channel disturbance and multipath fadings.
Above each side of the present invention and other characteristics are to realize fully by a kind of device that is used for detecting the synchronizing signal of the digital broadcast signal that receives, this device comprises: first correlation unit is used for calculating first correlation between predetermined reference pseudo noise (PN) sequence and the digital broadcast signal real component; Second correlation unit is used for calculating second correlation between predetermined reference PN sequence and the digital broadcast signal conjugate complex number component; The correlation value calculation unit is used for calculating the quadratic sum of first correlation and second correlation, removes the phase deviation with same phase in first correlation and second correlation, calculates the size of correlation between predetermined reference PN sequence and the synchronizing signal; And maximum detection unit, be used in predetermined period producing synchronous detection signal from the position of maximum related value.
Maximum detection unit comprises: comparing unit is used for the correlation of the vicinity relatively calculating continuously and export from the correlation value calculation unit; Counter is used in the predetermined period inside counting; And synchronizing signal generation unit, be used for when receiving as a result from comparing unit, storage and the corresponding index of maximum related value (index) that calculates in the given time from counter, and, if the storing value of Chan Shenging surpasses predetermined times in the given time, then produce synchronous detection signal.
Comparing unit comprises: first memory is used for storing the correlation of the digital broadcast signal that is applied to previous steps; Comparing unit is used for comparing the value of storing in the first memory with from the correlation of correlation value calculation unit output.
First memory resets after the count cycle of counter finishes.
The synchronizing signal generation unit comprises: second memory is used for storing index according to the comparative result in the comparing unit; The 3rd memory is used for storing the index of original state; Whether the index comparing unit is used for the index that comparison is stored at second memory and the 3rd memory, identical with the index of determining storage; And the signal generation unit, be used for when the definite result in the index comparing unit represents that same index surpasses pre-determined number, produce synchronous detection signal.
When the rolling counters forward end cycle, the 3rd memory updating is the data of second memory storage.
According to one aspect of the present invention, a kind of method that detects synchronizing signal from the digital broadcast signal that receives is provided, comprise step: calculate first correlation between predetermined reference pseudo noise (PN) sequence and the digital broadcast signal real component; Calculate second correlation between predetermined reference PN sequence and the digital broadcast signal conjugate complex number component; Obtain the quadratic sum of first correlation and second correlation, remove the phase deviation that has same phase in first correlation and second correlation, calculate the size of correlation between predetermined reference PN sequence and the synchronizing signal; And in predetermined period, produce synchronous detection signal from position with maximum related value.
Produce the correlation that the synchronous detection signal step comprises the steps: the vicinity calculated in the correlation value calculation step with the sequential order comparison; If result relatively points out to have the identical pre-determined number that surpasses in the position of the maximum related value in the correlation that calculates, then produce synchronous detection signal.
Description of drawings
By below in conjunction with accompanying drawing the embodiment of the invention being described, above-mentioned and other purposes of the present invention and characteristics will become apparent, wherein:
Fig. 1 is that traditional digital broadcast signal sends and the functional-block diagram of receiving system;
Fig. 2 is that digital broadcast signal sends and the block diagram of receiving system among Fig. 1, wherein, has produced channel disturbance;
Fig. 3 is the block diagram according to the sync signal detection apparatus of the embodiment of the invention;
Fig. 4 A and Fig. 4 B are illustrated in the schematic diagram that first correlation unit among Fig. 3 and second correlation unit calculate the process of correlation;
Fig. 5 is the more detailed block diagram of maximum detection unit among Fig. 3; With
Fig. 6 is the flow chart of expression according to the display synchronization signal detection method of the embodiment of the invention.
Embodiment
Below, describe embodiments of the invention in detail with reference to accompanying drawing.
In being described below,, use same reference numerals to represent same parts even in different pictures.The content that defines in the description just helps complete understanding the present invention as detailed structure and parts.Therefore, clearly, the present invention does not adopt the content of those qualifications can realize yet.Because well-known function and structure can be blured this invention on unnecessary details, therefore they are not described in detail.
Fig. 3 is the block diagram according to the sync signal detection apparatus of the embodiment of the invention.
Sync signal detection apparatus comprises: demodulating unit 50; First correlation unit 60; Second correlation unit 70; Correlation value calculation unit 80; Maximum detection unit 90.
Modulating unit 50 is removed carrier frequency from the digital broadcast signal that receives, with picked up signal X (t).More particularly, the signal (Ae that receives Jwt) X (t) multiply by frequency signal e in demodulating unit 50 -jwt, its result, the signal X (t) that has obtained to have the A amplitude.At this moment, by contiguous a plurality of channel disturbance, perhaps owing to multipath produces phase deviation, so that the signal phase variation phase is offset θ, and signal becomes (Ae from the digital broadcast signal of transmitter Jwt+ θ) X (t).In this case, the digital broadcast signal of phase change and e-jwt multiplied result can not obtain signal X (t), but show as real component and conjugate complex number component, and they are applied to first correlation unit 60 and second correlation unit 70 respectively.Conjugate complex number is represented phase deviation.
First correlation unit 60 calculates the just correlation of reference pseudo noise (R PN) sequence from the digital broadcast signal of demodulating unit 50 outputs.In other words, first correlation unit 60 calculates the just real component from the digital broadcast signal of modulating unit 50 outputs and first correlation between the R_PN sequence.The R_PN sequence is the signal with pattern identical with the synchronizing signal that comprises in the broadcast singal from transmitter, it is characterized by: the formation number of symbols with the correlation that calculates with the model identical of synchronizing signal and synchronizing signal is identical.In identical as mentioned above method, second correlation unit 70 calculates from conjugate complex number component in the digital broadcast signal of modulating unit 50 and second correlation between the R_PN sequence.
Correlation value calculation unit 80 is from each first correlations of first correlation unit 60 and 70 outputs of second correlation unit and second correlation respectively square, then its result of addition.For example, and respectively square, by the value after the addition square, just can obtain " 1 " then from (the sin wt+ θ) of 70 outputs of second correlation unit from (the cos wt+ θ) of the output of first correlation unit 60.Therefore, the phase deviation that produces can be removed in correlation value calculation unit 80 from the data transmission procedure of transmitted from transmitter to receiver.In addition, by based on first correlation with have the final correlation of second correlation value calculation of conjugate complex number component with real component, the correlation that correlation value calculation unit 80 finally obtains can be defined as (the formation number of symbols of 1 * synchronizing signal), and obtains the correlation bigger than multipath signal absolute value.Here, recently the digital broadcast signal of spontaneous emission machine is little for multipath signal.Consequently, by the correlation that obtains by correlation value calculation unit 80, have only the synchronizing signal that comprises in the main channel to be detected effectively, and by some factors, the synchronizing signal that is comprised in the digital broadcast signal as the weakening of the Doppler effect under multipath fading, channel disturbance and the mobile environment then can not be detected.
Maximum detection unit 90 detects the position of the maximum related value in predetermined period, produces synchronizing signal in detected this position.As described above, be unit with predetermined number of symbols, correlation value calculation unit 80 just calculates the digital broadcast signal that sends from transmitter and ready with reference to the correlation between the PN sequence (R_PN) receiver.This correlation is calculated continuously, up to detecting synchronizing signal, and, calculate maximum when the phase place of the synchronizing signal that comprises in the digital broadcast signal from transmitter and ready when mating in receiver with reference to the PN sequence phase, that is the number of the formation code element of synchronizing signal.According to the cycle of the signal format of the digital broadcast signal that is just sending from transmitter, determine the maximum sense cycle of maximum detection unit 90.For example, if transmitter is the digital broadcast signal that unit sends the spontaneous emission machine with 836 code elements, then maximum detection unit 90 produces synchronous detection signal (sync) in the position with maximum related value in the count cycle of 836 code elements.
Calculate the process of correlation in first correlation unit 60 that shows in Fig. 4 A and Fig. 4 B difference presentation graphs 3 and second correlation unit 70.
Shown in Fig. 4 A and Fig. 4 B, digital broadcast signal is received by the order with " A ", " B " zone.Fig. 4 A procedure for displaying be calculate in the digital broadcast signal " A " zone and with reference to the correlation between the PN sequence; Fig. 4 B procedure for displaying is to calculate major part " A " zone in the digital broadcast signal and part " B " zone and with reference to the correlation between the PN sequence.As shown, first correlation unit 60 and second correlation unit 70 multiply by predetermined number of symbols to digital broadcast signal, for example multiply by 511 code elements, and the addition result of product.When receiving new digital broadcast signal, calculate this correlation.
Fig. 5 is the more detailed block diagram of the maximum detection unit 90 that shows among Fig. 3.
Maximum detection unit 90 comprises: comparing unit 91; Counter 92; And synchronizing signal generation unit 93.
Comparing unit 91 is compared the correlation in that applies continuously from correlation value calculation unit 80 with the correlation of original state, and if determine that this correlation in that newly applies is bigger than original state correlation, then produce update signal (w_en).
Counter 92 comes code element is counted according to predetermined code-element period.For example, if transmitter is that unit sends digital broadcast signal with 836 code elements, according to the code-element period of 5 microseconds (μ s), then counter 92 is counted 836 code elements in 5 microseconds interval.
Synchronizing signal generation unit 93 is in response to from the index of the update signal w_en of comparing unit 91 storage from counter 92, and if determine that the value of per 836 code elements storage matches each other above pre-determined number, then produces synchronous detection signal (sync).For example, if when 836 code elements of counter 92 countings, calculate maximum from the 293rd code element, if and when counter 92 has been finished counting and counted 836 code elements again, calculated maximum from the 293rd code element once more, then synchronizing signal generation unit 93 would produce synchronous detection signal (sync) in the 293rd position.In other words, synchronizing signal generation unit 93 is to produce synchronous detection signal (sync) corresponding to the value that has peaked position in the predetermined period continuously.
Comparing unit 91 can comprise comparator 91a and first memory 91b.
Comparator 91a compares the correlation of storing the correlation in that applies from correlation value calculation unit 80 and the first memory 91b, if and determined that the correlation in that applies from correlation value calculation unit 80 is bigger than the correlation of storing the first memory 91b, the signal (w_en) that upgrades would then be produced.
In response to the update signal (w_en) that comparator 91a produces, the correlation in that first memory 91b storage applies from correlation value calculation unit 80.Therefore, first memory 91b storage is from up to producing the maximum related value that update signal (w_en) is calculated before from comparator 91a.
Synchronizing signal generation unit 93 can comprise second memory 93a, the 3rd memory 93b, index comparator 93c and signal generation unit 93d.
In response to the update signal (w_en) that produces from comparing unit 91a, the index that second memory 93a storage applies from counter 92.In response to the carry value that when the counter 92 of finishing a count cycle resets, produces, the index of storing among the 3rd memory 93b storage second memory 93a.Therefore, in the digital broadcast signal transmission cycle of each transmitter, as 836 code elements, the 3rd memory 93b uses the index of second memory 93a storage to upgrade the index of storage in the past.
Index comparing unit 93c compares the index of having stored among index of having stored among the second memory 93a and the 3rd memory 93b, and whether the index that applies before determining mates the current index that applies.If index matches each other, then show corresponding to the corresponding index in the position with the maximum related value in the previous steps correspondingly, therefore show that the synchronizing signal that comprises in the digital broadcast signal produces at same position with the position of maximum related value in having current step.In response to the input of identical index, index comparing unit 91 with than pre-determined number for example 3 times pre-determined number produce detection signal, and in response to detection signal, signal generation unit 93d produces synchronous detection signal (sync).
Fig. 6 is the flow chart of expression according to the detection synchronizing signal method of the embodiment of the invention.
According to current embodiment, at first, demodulating unit 50 obtains transmission signals X (t) by removing carrier frequency the digital broadcast signal that sends from the spontaneous emission machine.If digital broadcast signal (Ae Jwt) X (t) received by demodulating unit 50, demodulating unit 50 is just the signal (Ae that receives Jwt) X (t) multiply by e -jwtFrequency, thereby obtain the having amplitude transmission signals X (t) of ' A '.At this moment, may be from the digital broadcast signal of transmitter by adjacent channel interference, perhaps because multipath signal and may produce phase deviation, thereby signal phase changes phase deviation θ, and signal becomes (Ae Jwt+ θ) X (t).In this case, the digital broadcast signal (Ae of phase change Jwt+ θ) X (t) multiply by e -jwtCan not get X (t), but show as real component and conjugate complex number component, and these are respectively applied to first correlation unit 60 and second correlation unit 70.Conjugate complex number has been represented phase deviation.
First correlation unit 60 calculates real component in modulating unit 50 modulated digital broadcast singals and ready with reference to first correlation (step S100) between the pseudo noise sequence (R_PN) at receiver.The R_PN sequence be have with broadcast singal from transmitter in the signal of the synchronizing signal model identical that comprises.The correlation that calculates when reference pseudo noise sequence (R_PN) and synchronizing signal have same phase is based on that the formation number of symbols of synchronizing signal calculates.Next, second correlation unit 70 calculates conjugate complex number (imaginary number) part in modulating unit 50 modulated digital broadcast singals and ready with reference to second correlation (step S200) between the pseudo noise sequence (R_PN) at receiver.Correlation value calculation unit 80 is from first correlation of first correlation unit 60 and 70 outputs of second correlation unit and second correlation respectively square, then addition result value (step S300).Therefore, the square value of the square value of first correlation and second correlation and be " 1 ".For example, when with the corresponding correlation of real component from the output of first correlation unit 60 with the corresponding correlation of conjugation complex number components the time from 70 outputs of second correlation unit, each output valve (cos wt+ θ) and (sin wt+ θ) by square, addition then, result's absolute value becomes " 1 ".Therefore, the phase deviation that produces is removed in correlation value calculation unit 80 from the transmitted from transmitter to receiver data transmission procedure.The correlation value calculation calculated from real component and conjugate complex number component comes out because the size of final correlation is based on, the maximum of final correlation may be defined as " the formation number of symbols of 1 * synchronizing signal ", and can calculate the correlation bigger than the absolute value of multipath signal, this multipath signal is littler than the digital broadcast signal of transmission.Therefore, 80 synchronizing signals that detect in the main channel in correlation value calculation unit, and can not detect by the synchronizing signal in the digital broadcast signal of the weakening of the Doppler effect under multipath fading, channel disturbance and the mobile environment.
Next, 836 code-element periods for example in predetermined period calculate and the corresponding index of peak (step S400), and this peak has the greatest measure in the quadratic sum numerical value that as above obtains.This index be predetermined period for example 836 code-element periods from the position of quadratic sum value maximum by counter 92 numerical value.Next, if producing number of times, identical index surpasses pre-determined number, for example, same index produces number of times and surpasses predetermined 3 times (step S500), then determine in the cycle of rule, to have detected synchronizing signal, and therefore produced synchronous detection signal (step S600).As mentioned above, can avoid effectively because the mistake that in synchronous detecting, produces from the synchronizing signal of the multipath problem relevant such as Doppler effect with mobile communication environment with signal relatively littler than main footpath signal.
Described in some embodiments of the present invention, it is minimum that the phase deviation of the digital broadcast signal of spontaneous emission machine in the future and the influence that produces drop to, and can detect the synchronizing signal that comprises in the main footpath effectively.
Aforesaid embodiment and superiority only are exemplary, should not be construed as limitation of the present invention.The device that can easily be applied to other types is stated in current religion.In addition, be illustrative to the description of embodiments of the invention, the invention is not restricted to the foregoing description, without departing from the present invention, can carry out various changes and modifications.

Claims (8)

1. device that is used for detecting the synchronizing signal in the digital broadcast signal that receives comprises:
First correlation unit is used for calculating first correlation between the real component in predetermined reference pseudo noise PN sequence and the digital broadcast signal;
Second correlation unit is used for calculating second correlation between the conjugate complex number component in predetermined reference PN sequence and the digital broadcast signal;
The correlation value calculation unit is used for obtaining the quadratic sum of first correlation and second correlation, removes the phase deviation that has same phase in first correlation and second correlation, calculates the size of correlation between predetermined reference PN sequence and the synchronizing signal; With
Maximum detection unit is used for producing synchronous detection signal from the position that has maximum related value in predetermined period.
2. device as claimed in claim 1, wherein maximum detection unit comprises:
Comparing unit is used for the correlation of the vicinity relatively calculating continuously and export from the correlation value calculation unit;
Counter is used in the predetermined period inside counting; With
The synchronizing signal generation unit, be used for the comparative result that basis receives from comparing unit, storage and the corresponding index of maximum related value that in predetermined period, calculates from counter, and, if the storing value that produces surpasses predetermined times, just produce synchronous detection signal in predetermined period.
3. device as claimed in claim 2, wherein comparing unit comprises:
First memory is used for storing the correlation of the digital broadcast signal that is applied to previous steps; With
Comparing unit is used for the correlation of storing value in the first memory and the output of correlation value calculation unit is compared.
4. device as claimed in claim 3, wherein, first memory resets after the count cycle of counter finishes.
5. device as claimed in claim 3, wherein the synchronizing signal generation unit comprises:
Second memory is used for storing index according to the comparative result of comparing unit;
The 3rd memory is used for storing the index of original state;
Whether the index comparing unit is used for relatively being stored in the index in second memory and the 3rd memory, identical with the index of determining storage; With
The signal generation unit is used for producing synchronous detection signal when the definite result in the index comparing unit represents that identical index surpasses pre-determined number.
6. device as claimed in claim 5, wherein, when the count cycle of counter finished, the value of the 3rd memory stores was updated to the value of second memory storage.
7. method that is used for from the digital broadcast signal that receives detecting synchronizing signal comprises step:
First correlation between the real component in the digital broadcast signal that calculates predetermined reference pseudo noise PN sequence and receive;
Second correlation between the conjugate complex number component in the digital broadcast signal that calculates predetermined reference PN sequence and receive;
Obtain the quadratic sum of first correlation and second correlation, remove the phase deviation that has same phase in first correlation and second correlation, calculate the size of the correlation between predetermined reference PN sequence and the synchronizing signal; With
Produce synchronous detection signal from the position that in predetermined period, has maximum related value.
8. method as claimed in claim 7, the step that wherein produces synchronous detection signal comprises the steps:
The correlation of the vicinity of in the correlation value calculation step, calculating with the sequential order comparison; With
If comparative result shows the identical pre-determined number that surpasses in the position that has maximum related value in the correlation that calculates, then produce synchronous detection signal.
CN2004100475399A 2003-07-01 2004-05-21 Apparatus and method for detecting synchronous signal Expired - Fee Related CN100407762C (en)

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KR100774197B1 (en) * 2006-03-14 2007-11-08 엘지전자 주식회사 apparatus for demodulating broadcast signal
KR101043689B1 (en) * 2007-10-29 2011-06-24 주식회사 텔에이스 Method and apparatus for acquiring initial synchronous signal for gps
CN103760507B (en) * 2014-01-02 2016-09-21 北京大学 One realizes the phase locked method and device of emission source and reception source
JP7046937B2 (en) * 2017-06-02 2022-04-04 株式会社Ｎｔｔドコモ Terminals, wireless communication methods, base stations and systems

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