CN101094052A - Apparatus and method for synchronising detecting transmit frames - Google Patents
Apparatus and method for synchronising detecting transmit frames Download PDFInfo
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- CN101094052A CN101094052A CNA2007101121431A CN200710112143A CN101094052A CN 101094052 A CN101094052 A CN 101094052A CN A2007101121431 A CNA2007101121431 A CN A2007101121431A CN 200710112143 A CN200710112143 A CN 200710112143A CN 101094052 A CN101094052 A CN 101094052A
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/04—Speed or phase control by synchronisation signals
- H04L7/041—Speed or phase control by synchronisation signals using special codes as synchronising signal
- H04L7/043—Pseudo-noise [PN] codes variable during transmission
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L7/00—Arrangements for synchronising receiver with transmitter
- H04L7/0054—Detection of the synchronisation error by features other than the received signal transition
- H04L7/007—Detection of the synchronisation error by features other than the received signal transition detection of error based on maximum signal power, e.g. peak value, maximizing autocorrelation
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04H—BROADCAST COMMUNICATION
- H04H2201/00—Aspects of broadcast communication
- H04H2201/10—Aspects of broadcast communication characterised by the type of broadcast system
- H04H2201/11—Aspects of broadcast communication characterised by the type of broadcast system digital multimedia broadcasting [DMB]
Abstract
The present invention discloses a synchronous device and method for detecting received transmission frame, thereby generating PN sequence symbol through generating polynomial, and if PN sequence symbol value and PN sequence symbol extending to front synchronous code and back synchronous code symbol values are the same with the symbol value as training signal inserted into receiving transmission frame, then generates synchronous signal so as to detect the transmission frame synchronization accurately.
Description
The cross reference of related application
This application based on, and require to submit on June 22nd, 2006, the priority of korean application 10-2006-0056482 comprises the disclosure and as a reference fully at this.
Technical field
Generally speaking relevant receiver is below described, and the more specifically relevant synchronous apparatus and method that are used to detect the transmission frame of reception.
Background technology
The Tsing-Hua University of China proposes a kind of digital ground multimedia broadcast (DTMB) and is broadcast standard.According to the DTMB standard, transmitter uses Domain Synchronous-Orthodoxy Frequency Division Multiplex (TDS-OFDM) system.
TDS-OFDM carries out inverse discrete Fourier transform (IDFT) on the frame main body of the transmission frame that sends through a plurality of subcarriers, be similar to Cyclic Prefix-OFDM (CP-OFDM).Pseudo noise (PN) sequence is used as training signal (known array in (GI) at interval in protection; pilot frequency sequence) rather than Cyclic Prefix (CP); transmit overhead to reduce, thereby increase channel efficiency and improve the synchronizer of receiver and the performance of channel-estimator.Can obtain to be used to create the formula of PN sequence by following formula 1.
[formula 1]
P(x)＝x
8+x
6+x
5+x+1
Receiver receive the transmission frame that produces by transmitter with detect the transmission frame that receives synchronously.Detection synchronous in the transmission frame is used by the training signal that is inserted in the frame synchronization.
When receiver detected transmission frame synchronous, use the synchronous execution automatic frequency control (AFC) of the detection of transmission frame, with synchronic PN sequence with reconfigure the frame main body of the transmission frame of reception.Therefore, receiver must by receive transmission frame and use the transmission frame of this reception come detected transmission frame accurately synchronously.
Summary of the invention
Purpose provides a kind of synchronous apparatus and method that receive transmission frame that are used to detect, its be configured to transmission frame that accurate detection receives by receiver synchronously.
Another purpose provides a kind of synchronous apparatus and method that are used to detect the transmission frame of reception, and it is configured to the whole whole code element that is inserted in the training signal in the frame synchronization of transmission frame by use, come detected transmission frame accurately synchronously.
One total aspect in, a kind of synchronous device that is used for the detected transmission frame comprises: PN (pseudo noise) sequencer, it considers that predetermined generator polynomial produces the code element of PN sequence; Correlation unit, the code element of the symbol value that extends to preamble and postamble in the symbol value of the PN sequence that it will be produced by the PN sequencer and the PN sequence of generation, compare with the whole value as the code element of training signal in the transmission frame that is inserted in reception, to calculate correlation; And synchronizing indicator, correlation and predetermined first and second threshold values that it is relatively exported by correlation unit are to produce synchronous detection signal in response to comparative result.
Correlation unit comprises: the first and the 3rd working cell, and it calculates the symbol value that extends to preamble and postamble in the symbol value of the PN sequence that is produced by the PN sequencer, and the value with the code element of the reception of transmission frame is identical; Whether second working cell, its symbol value that calculates the PN sequence that is produced by the PN sequencer value with the code element of the reception of transmission frame be identical; With the first, the second and the third integral device, its each output signal to the first, the second and the 3rd working cell is carried out integration, with the correlation that produces correlation and this generation of output to synchronizing indicator.
The number of the code element that extends to postamble in the code element that transmission frame is arranged is imported in first and second working cells, and the number of the code element that extends to preamble in the code element that transmission frame is arranged is imported in the second and the 3rd working cell.
The realization of this aspect can comprise one or more following features.
Whole code element as training signal in the transmission frame that insertion receives can be used for the synchronous of detected transmission frame.
For this reason, the synchronous device that is used for the detected transmission frame can be provided with the PN sequencer to produce the code element of PN sequence, wherein correlation unit relatively the PN sequence code element and insert in the transmission frame that receives whole code element as training signal to calculate correlation.
For this reason, correlation unit can comprise the first, the second and the 3rd working cell, and for the first, the second and third integral device of the output signal integration of the first, the second and the 3rd working cell, with the output correlation.
The code element that extends to preamble and postamble in the code element of generation of PN sequence can be imported in the first and the 3rd working cell, and the code element of whole generations of PN sequence can be imported in second working cell.
In addition, the code element of the reception of transmission frame can be shifted sequentially to be imported first, in the second and the 3rd working cell, and the number of the code element that extends to postamble can repeatedly be imported in first and second working cells, and the number of the code element that extends to preamble can repeatedly be imported in the second and the 3rd working cell.
Each output signal of the first, the second and the 3rd working cell can by the first, the second and third integral device integration to produce correlation, wherein synchronizing indicator detected transmission frame synchronously, and if detected synchronously, produce synchronous detection signal.
In aspect another is general, a kind of synchronous method that is used for the detected transmission frame comprises: produce the PN sequence by the PN sequencer; Relatively produce the symbol value of the reception of the symbol value of PN sequence respectively and transmission frame by second working cell, to allow the second integral device to carrying out integration from the signal that relatively produces and producing second correlation; By the first and the 3rd working cell symbol value of the reception of the symbol value that extends to preamble and postamble in the code element of PN sequence and transmission frame relatively, with allow first and the third integral device respectively to carrying out integration from the signal that relatively produces and producing first and third phase pass value; Value that the first, the second and the third phase pass of being calculated more like this by synchronizing indicator is worth and predetermined first and second threshold values are to produce synchronous detection signal in conjunction with comparative result.
Description of drawings
The current general inventive concept that does not limit exemplary realization will be specifically described with reference to the accompanying drawings.No matter wherein, identical reference number will be used in and be used for the same or analogous part of accompanying drawing expression.
Fig. 1 shows has 1/9 the protection schematic diagram of the structure of the transmission frame of (GI) at interval that size is a frame main body;
Fig. 2 shows the block diagram of the configuration of receiver;
Fig. 3 is the exemplary configuration of the synchronous PN correlator of detected transmission frame;
Fig. 4 is the schematic diagram of explaining by the correlated results signal with 3 peak values of correlation unit output;
Fig. 5 is the curve chart of explanation from the correlated results signal of the integrator output of Fig. 3;
Fig. 6 is a schematic diagram of describing the configuration be used to detect synchronous device;
Fig. 7 explains the signal flow graph that is used to detect synchronous method.
Embodiment
The realization of describing only is used for explanation and without limits.The theme that is provided at example in this explanation is to help extensively to understand disclosed with reference to the accompanying drawings definite exemplary teachings.Therefore, one of skill in the art will recognize that the various changes and the modification that under the situation of the scope and spirit that do not break away from claims, can be made at exemplary realization described herein.Therefore the application is used for explaining its General Principle and notion with the most useful with the easiest mode.
Fig. 1 shows has 1/9 the protection schematic diagram of the structure of the transmission frame of (GI) at interval that size is a frame main body;
With reference to figure 1, the transmission frame that sends from DTMB comprises frame synchronization and the frame main body as data break.Frame main body comprises the code element of the audio ﹠ video signal that is sent out, and uses DFT (discrete Fourier transform) to it.
Frame synchronization comprises that the PN sequence is as training signal.The PN sequence that is used for frame synchronization may be used, and for example, but is not limited to, wherein the sequence of parameter m=8.Only 255 bit streams are present in the sequence of parameter m=8 wherein.Wherein the PN sequence of parameter m=8 can produce 255 sequences that differ from one another.Therefore, in 255 code elements, when generation has 1/9 GI of frame main body, be extended to preamble in the code element of latter end, and be extended to postamble has 420 code elements with generation PN sequence in the code element of beginning part.
For example, if frame main body forms with 3780 code elements, must form GI with 420 code elements with frame main body 1/9 size.Therefore, for by creating 420 code elements, be extended in the preamble in 50 code elements of latter end, and be extended in the postamble in 115 code elements of beginning part in conjunction with 255 code elements.At this moment, preamble and postamble are that the circulation of PN code is extended, and the PN code is changed to 254 in response to the phase place of initial condition generation from 0 with it.
The GI size can be 1/9,1/4 or 1/6 of a frame main body, changes the length of GI so that can consider the method for configuration-system.In transmitter the PN sequence be inserted into transmission frame GI so that receiver use the PN sequence in GI, carry with the detected transmission frame synchronously.
Now, with reference to Fig. 2 of block diagram of the configuration that shows receiver, receive the transmission frame of radio frequency (RF) frequency band that sends by transmitter by tuner 200.The transmission frame that is received by tuner 200 is converted to digital signal by ADC202 (analog-digital converter), and is divided into in-phase signal and orthogonal signalling to be input in the signal Synchronization device 206 by phase splitter 204.
Signal Synchronization device 206 mainly comprises three parts.First is AFC260 (automatic frequency controller), it is used to compensate the frequency error of the transmission frame of reception, second portion is a sequential synchronizer 262, it is used for synchronously the PN sequence of the transmission frame that sent by transmitter, and third part comprises tracker 264 and resampling device 254, it is used for compensation when the not produced simultaneously symbol error of sample rate, that is to say that being used for by receiver and transmitter converting analogue signals is digital signal.
Above-mentioned three work all are to obtain as the correlated results of PN correlator 258.In other words, PN correlator 258 uses the transmission frame that receives to determine the relevant of PN sequence, and as the correlated results of PN correlator 258, the detected transmission frame synchronously and AFC260 produce the AFC signal that is used for the compensating frequency error.The AFC signal that is produced by AFC260 is multiplied by the in-phase signal and the orthogonal signalling of being divided by phase splitter 206, compensating frequency error thus at multiplier 252.
In addition, synchronized result as the transmission frame that detects by PN correlator 259, these sequential synchronizer 262 synchronic PN sequences, and tracker 337 is compensated the symbol error of transmission frames thus in response to the output signal control resampling device 254 of sequential synchronizer 262 by multiplier 352.
By 256 filtering of square root raised cosine (SQRC) filter, and be imported into PN correlator 258 by the transmission frame of resampling device 254 compensation symbol errors, wherein PN correlator 258 uses from the transmission frame of SQRC filter 256 inputs and determines the relevant of PN sequence.
In addition, be imported into signal by the data of SQRC filter 256 filtering and reconfigure in the unit 208, and be imported into signal by the relevant again signal of PN correlator 356 and reconfigure in the unit 208.This signal reconfigures unit 306 and removes with the frame synchronization field of various routes from the data of the reception of SQRC filter 256 inputs in response to relevant consequential signal, and the frame body field of data that wherein reconfigures reception is so that it has recurrence relation.
Reconfigure the data transmission frames that allows frame body field to have recurrence relation and carry out discrete Fourier transforms (DFT) thereby reconfigure unit 208, so that the code element of frame main body is converted into frequency domain symbols by DFT unit 210 by signal.In its channel, compensate the frequency domain symbols of having changed by equalizer 212, and output to channel decoder by DFT unit 210.
Fig. 3 is the exemplary configuration of the synchronous PN correlator 258 of detected transmission frame, and wherein reference number 300 is PN sequencers.PN sequencer 300 produced as a PN sequence in the PN sequence of training signal in transmission frame in the synchronous initial period of detected transmission frame.In other words, when initial detected transmission frame synchronous, PN sequencer 300 produces the PN sequence by predetermined fixed value.If detect the synchronous of transmission frame, PN sequencer 300 produces the PN sequence in response to the PN information that is produced by PN sequence information generator 310 with variable value.According to, for example, the generator polynomial of above-mentioned formula 1, the PN sequence that is produced by PN sequencer 300 comprises 255 code elements.
255 code elements of the PN sequence that is produced by PN sequencer 300 are imported in the working cell 324 of correlation unit 320.In addition, the code element by the transmission frame of SQRC filter 256 filtering sequentially is shifted to allow 255 code elements to be imported in the working cell 324 of correlation unit 320.
Unceasingly, working cell 324 is relatively by 255 code elements of displacement sequentially and the transmission frame imported by 256 filtering of SQRC filter and 255 code elements that produce by PN generator 300, and determines whether they are identical.
For example, each working cell 324 comprises one group of exclusive NOR door, exactly, and 255 doors.Each of 255 XOR gate is calculated 255 code elements (322) of transmission frame of displacement and 255 code elements that produced by PN generator 300, and if symbol value identical, output logic ' 1 ', and if value different, output logic ' 0 '.
The output signal of a plurality of working cells 324 is exported the correlated results signal thus by integrator 326 integrations.That is, integrator 326 add and by whole signal calculated of each working cell 324 outputs to export this correlated results signal.
Correlated results signal by integrator 326 outputs is imported in the peak detector 330 to cause the peak value that detects greater than predetermined threshold.
Be imported into distance calculator 340 to cause the distance of calculating between the peak value from the peak value of peak detector 330 outputs.Be imported into PN sequence information generator 310 by the distance between the peak value of distance calculator 340 calculating.PN sequence information generator 310 produces the information that is used to produce the PN sequence in response to the distance between the peak value that calculates, and PN sequencer 300 produces the PN sequence in response to the PN sequence information that produces.
When 255 code elements that send as the PN sequence of training signal, the whole distances between the correlation peak of each transmission frame (skew of peak value) are estimated correlation peak easily for the transmitter among the DTMB not simultaneously.The skew of peak value is about 113 PN sequence inherences.If sequentially be inserted in the frame synchronization of each transmission frame in 112 code elements of transmitter, and send described 112 code elements by inserting with about the 113rd order that code element is opposite, the skew of peak value may occur.Therefore, the transmitter among the DTMB only comprises quick 113 code elements that produce in 255 PN sequences and sends in the training signal of transmission frame.
The frame synchronization of transmission frame makes that when the PN sequence extended to preamble and postamble, the correlated results signal of exporting from the correlation unit 320 of receiver may have 3 peak values.
Fig. 4 explains that the correlated results signal by correlation unit 320 outputs has the schematic diagram of 3 peak values, wherein reference number 400 definition is input to the position of 255 code elements that produced by PN sequencer 300 of a plurality of working cells 324, and reference number 402,404 and 406 expressions are input to the position of the code element of a plurality of working cells 324 by shift transport frame sequentially.
When the code element of transmission frame sequentially is shifted when arriving 402 positions, the transmission frame of 50 code elements that the are arranged in latter end corresponding reception on its value in the code element that is produced by PN sequencer 300 extends to 50 code elements of preamble.Subsequently, the correlated results signal by correlation unit 320 outputs can have peak value (500.Hereinafter referred to as the preamble peak value), as shown in Figure 5.
When the code element of the reception of transmission frame arrives 404 positions, described 255 code elements, 255 code elements in the corresponding transmission frame that receives on its value that produce by PN sequencer 300.Subsequently, the correlated results signal from correlation unit 320 outputs can have peak value (502.Hereinafter referred to as the main peak value), as shown in Figure 5.
When the code element of the reception of transmission frame arrived 406 positions, the transmission frame of 115 code elements corresponding reception on its value that being arranged in the beginning part in 255 code elements that produced by PN sequencer 300 extended to 115 code elements of postamble.Subsequently, the correlated results signal from correlation unit 320 outputs can have peak value (504.Hereinafter referred to as the postamble peak value), as shown in Figure 5.
The distance that the position of main peak value 502 separates equals the inherence skew according to the peak value of transmission frame.In addition, if detect a single main peak value, can know the position of main peak value 502 of the transmission frame of next reception, and can store its distance value with table format.In case detect main peak value 502 from current transmission frame, by read the position of main peak value 502 transmission frame of estimating next reception from table.
As a result, in case store the inherence skew of main peak value 502 with table format, and pass through the coherent detection main peak value 502 of the reception of transmission frame, can obtain the position of the main peak value of generation subsequently from table.
The distance calculator 340 of Fig. 3 calculates each distance of main peak values 502, and the range information of main peak value that calculating can be provided is to PN sequence information generator 310.
PN sequence information generator 310 service range information are sequentially upgraded the PN sequence information that is produced by PN sequencer 300 and are provided this information to PN sequencer 300.PN sequencer 300 can use the PN sequence information that is provided by PN sequence information generator 310 to produce new PN sequence.
The correlated results signal of the transmission frame of Jie Shouing has preamble peak value 500 and postamble peak value 504 like this, is wherein extended to the code element of preamble and postamble in the PN sequence of the corresponding transmission frame that is receiving on its value by the part code element in the PN sequence of PN sequencer 300 generations.
Simultaneously, when 255 code elements of the PN sequence of the transmission frame of 255 code elements of the PN sequence that is produced by PN sequencer 300 and reception produce between preamble peak value 500 and postamble peak value 404 in the main peak value 502 to seasonable generation on its value, and its size is higher than preamble peak value 402 and postamble peak value 404.
When the transmission frame that is received by DTMB is relevant with the PN sequence that is produced by PN sequencer 300, the size of the preamble peak value 500 that is produced by the code element that extends to preamble is the about 1/5 of main peak value 502, and approximately is 1/5 of main peak value 502 by the size of the postamble peak value 504 of the code element generation that extends to postamble.
For peak detector 330 accurately detects main peak value 502, threshold value must be much larger than preamble peak value 500 and postamble peak value 504.Yet, if the threshold value of setting up is higher, the channel variation the during transmission that seriously produces transmission frame, if perhaps there is the multiple tracks effect, peak detector 330 may not detect main peak value 502.
Alternatively, if the threshold value of setting up is lower, because preamble peak value 500 and postamble peak value 504 may not detect main peak value 502.In other words, if reflect channelling effect on the transmission frame that receives, it is synchronous to cause detecting error that preamble peak value 500 or postamble peak value 504 may be misinterpreted as main peak value 502.
Fig. 6 is a schematic diagram of describing the configuration be used to detect synchronous device, wherein the code element of the transmission frame that receives of reference number 600 definition.The code element 600 of the transmission frame that receives sequentially is shifted to be imported in the correlation unit 630 that will be described later.
The PN sequence code element that is produced by PN sequencer 610 is imported into the first, the second and the 3rd working cell 632 of correlation unit 630, and 632a is among the 632b.For example, suppose that this PN sequencer 610 produces 255 code elements as the PN sequence, second working cell 632a input has whole 255 code elements that produced by PN sequencer 610.115 code elements of beginning part that there are 50 code elements of the ending that extends to preamble in 255 code elements that produced by PN sequencer 610 the first and the 3rd working cell 632,632b input and extend to postamble are as the PN sequence.
In addition, the code element of the reception of transmission frame sequentially is shifted to be imported into the first, the second and the 3rd working cell 632, and 632a is among the 632b.For example, the input of first working cell 632 has the continuous individual code element of 165 (50+115) in the middle of the code element of reception of transmission frame, and second working cell 632a input has 255 continuous code elements, and the 3rd working cell 632b is given and 165 continuous code elements.
At this moment, 115 code elements that are input to the ending of first working cell 632 overlap each other with the beginning that is input to the second working cell 632a 115 code elements partly, and in identical environment, 50 code elements that are input to the ending of the second working cell 632a overlap each other with the beginning that is input to the 3rd working cell 632b 50 code elements partly.
Unceasingly, each the first, the second and the 3rd working cell 632,632a, 632b determines whether the code element of being imported by the PN sequence that PN sequencer 610 produces is identical with the code element with input reception, displacement sequentially of transmission frame, and produces from determining a plurality of signals of generation.That is, if each code element is identical, the first, the second and the 3rd working cell 632,632a, the signal of 632b output logic " 1 ", and if each code element differ from one another the first, the second and the 3rd working cell 632,632a, the signal of 632b output logic " 0 ".
As mentioned above, the first, the second and the 3rd working cell 632,632a, each of 632b may comprise one group of exclusive NOR door, with the code element of the reception of the code element of calculating the PN sequence that is produced by the PN sequencer and transmission frame.
In addition, the first, the second and the 3rd working cell 632,632a, each of 632b can comprise a plurality of code converters of code that are used for changing in response to the code element of the PN sequence that is produced by PN sequencer 610 code element of transmission frame.For example, if the symbol value of transmission frame is " 1 " or " 1 ", PN sequencer 610 produces the code element of the PN sequence with value " 1 " or " 0 " based on generator polynomial, and the code element that has value " 0 " in the middle of the code element of the generation of PN sequence is converted into the have value code element of " 1 ", and be imported into first, the second and the 3rd working cell 632,632a, 632b.In addition, if PN sequence transmission frame value is " 1 ", the first, the second and the 3rd working cell 632,632a, 632b export the code element of transmission frame as it is, and if the value of PN sequence be " 1 ", the code of input symbols of counter-rotating and output transmission frame.
By this, have the first, the second and the 3rd working cell 632 of code converter, 632a, the configuration of 632b can obtain the result identical with the configuration with XOR gate.
With regard to hardware, the configuration with code converter is with to have comparing of XOR gate simpler, so that each the first, the second and the 3rd working cell 632,632a, 632b preferably dispose a plurality of code converters.
From the first, the second and the 3rd working cell 632,632a, the signal of 632b output are imported into the first, the second and third integral device 634 respectively, 634a, and 634b also carries out integration.That is, the first, the second and third integral device 634,634a, 634b add respectively and from the first, the second and the 3rd working cell 632,632a, a plurality of output signals of 632b output.
Under this environment, the synchronizing indicator of main peak value detector 642 640 uses from the first, the second and third integral device 634,634a, the output signal of 634b with the detected transmission frame synchronously.That is, synchronizing indicator 640 is relatively from the value and the predetermined first threshold of the signal of second integral device 634a output.Result as a comparison, if from the signal value of second integral device 634a output greater than predetermined first threshold, second integral device 634a determines whether to detect the main peak value with generation enabling signal (EN).
In other words, when the code element displacement of the reception of transmission frame all is input to first with 420 code elements that cause frame synchronization, the second and the 3rd working cell 632,632a, during 632b, the the first, the second and the 3rd working cell 632,632a, each output of 632b has a plurality of definite signal of logical one to cause whole first, second and third integral device 634,634a, 634b exports peak value, and the comparator 646 of synchronizing indicator 640 uses first, second and third integral device 634,634a, the output signal of 634b produces synchronous detection signal.
Simultaneously, above-mentioned exemplary realization is described in conjunction with the detection of main peak value, the output signal value and the first threshold that wherein compare second integral device 634a by the synchronizing indicator 640 of main peak value detector 642, if and it is on duty with first and third integral device 634 to detect main peak by multiplier, the output signal value of 634b, if with the value that multiplies each other greater than second threshold value, then produce synchronous detection signals by comparator 646.
Yet the present invention's design is not limited to these.For example, main peak value detector 642 can be positioned at comparator 646 just afterwards to produce synchronous detection signal.In other words, from first and third integral device 634, the output signal value of 634b is multiplied each other by multiplier 644, and if the value that multiplies each other greater than second threshold value then comparator 646 produces enabling signals.Start main peak value detector 642 in response to the enabling signal that produces by comparator 646, to allow relatively output signal value and the first threshold of second integral device 634a, if and as a comparison the result from the output signal value of second integral device 634a greater than first threshold, can produce synchronous detection signal.
In addition, the synchronous device according to current realization detected transmission frame may further include distance calculator 650 and PN sequence information generator 620.Distance calculator 650 calculates the distance in the middle of the synchronous detection signal that is produced by synchronizing indicator 640.PN sequence information generator 620 utilizes the distance in the middle of the synchronous detection signal that is produced by synchronizing indicator 640 to be used to allow PN sequencer 610 to produce the PN sequence with the PN sequence generation information that produces PN sequence generation information and produce.
Fig. 7 explains the signal flow graph that is used to detect synchronous method.
With reference to figure 7, PN sequencer 610 at first produces PN sequence (S700).For example, the PN sequence that is produced by PN sequencer 610 comprises 255 code elements.The code element of the reception of transmission frame is by displacement (S702) sequentially, the first, the second and the 3rd working cell 632 wherein, and 632a, 632b calculate the code element (S704) of the displacement of the code element of the PN sequence that is produced by PN sequencer 610 and transmission frame.For example, whether the code element of 255 code elements that the second working cell 632a determines to be produced by PN sequencer 610 and the reception of transmission frame is identical respectively, and the code element with the reception of transmission frame is identical respectively for the first and the 3rd working cell 632,165 code elements that extend to preamble and postamble in 255 code elements that 632b determines to be produced by PN sequencer 610.
The the first, the second and the 3rd working cell 632,632a, the signal of the calculating of 632b are imported into the first, the second and third integral device 634,634a, 634b also carries out integration (S706) respectively.
Under this environment, output signal value and first threshold (S708) that main peak value detector 642 compares from second integral device 634a, and the result determines whether to detect main peak value (S710) as a comparison.
Result as a comparison, if detected the main peak value, multiplier 644 is with first and third integral device 634, and the output signal value of 634a multiplies each other (S712), and comparator 646 determines that whether the output signal value of multipliers 644 is greater than predetermined second threshold value (S714).
Result as a comparison, if the signal value of multiplier 644 outputs greater than predetermined second threshold value, the synchronous detection signal of comparator 646 generation transmission frames.
Find out significantly from above-mentioned, when detected transmission frame synchronous, the code element that is inserted in the code element of the PN sequence in the frame synchronization of transmission frame and extends to the PN sequence of preamble and postamble all be used for the detected transmission frame synchronously.As a result, accurately the detected transmission frame synchronously, can accurately carry out the AFC (automatic frequency control) of the transmission frame that is used to receive thus, the reconfiguring of the synchronous and frame main body of PN sequence.
Although accompanying drawing has shown above-mentioned exemplary realization, it should be understood by one skilled in the art that the present invention design is not limited to this realization, but under the situation that does not break away from spirit of the present invention, can carry out various changes or modification it.Therefore, protection range should only be determined by additional claim and its equivalence.
Claims (15)
1. a synchronous device that is used for the detected transmission frame comprises: PN (pseudo noise) sequencer, the code element of the predetermined generator polynomial generation of its consideration PN sequence; Correlation unit, the symbol value of the symbol value that extends to preamble and postamble in the symbol value of the PN sequence that it is relatively produced by the PN sequencer and the PN sequence of generation, and be inserted in code element in the transmission frame of reception, to calculate correlation; And synchronizing indicator, correlation and predetermined first and second threshold values that it is relatively exported by correlation unit are to produce synchronous detection signal in response to comparative result.
2. device as claimed in claim 1, wherein, this correlation unit comprises: the first and the 3rd working cell, and it calculates the symbol value that extends to preamble and postamble in the symbol value of the PN sequence that is produced by the PN sequencer, and the symbol value with the reception of transmission frame is identical; Whether second working cell, its symbol value that calculates the PN sequence that is produced by the PN sequencer symbol value with the reception of transmission frame be identical; With the first, the second and the third integral device, its each output signal to the first, the second and the 3rd working cell is carried out integration, with the correlation that produces correlation and export this generation to synchronizing indicator.
3. device as claimed in claim 2, wherein, the number of the code element that extends to postamble in the code element that transmission frame is arranged is imported in this first and second working cell.
4. device as claimed in claim 2, wherein, the number of the code element that extends to preamble in the code element that transmission frame is arranged is imported in this second and the 3rd working cell.
5. device as claimed in claim 2, wherein, this first, the second and the 3rd working cell comprises a plurality of XOR gate respectively.
6. device as claimed in claim 2, wherein, this first, the second and the 3rd working cell comprises a plurality of code converters respectively, it is used for the code in response to the code element of the code counter-rotating transmission frame of the code element of importing from the PN sequencer.
7. device as claimed in claim 2, wherein, this is the first, the second and the third integral device adds and respectively from the value of the signal of the first, the second and the 3rd working cell output years old.
8. device as claimed in claim 2, wherein, this synchronizing indicator comprises: main peak value detector, if from the output signal value of second integral device greater than predetermined first threshold, it produces enabling signal; Multiplier, if produced enabling signal, its will from first and the output signal value of third integral device multiply each other; And comparator, if the value that multiplies each other of multiplier greater than predetermined first threshold, it produces synchronous detection signal.
9. device as claimed in claim 2, wherein, this synchronizing indicator comprises: multiplier, its will from first and the output signal value of third integral device multiply each other; Comparator, if the value that multiplies each other of multiplier greater than predetermined first threshold, it produces enabling signal; With main peak value detector, if produced enabling signal and from the output signal value of second integral device greater than predetermined first threshold, it produces synchronous detection signal.
10. device as claimed in claim 1, it further comprises: distance calculator, it calculates the distance that is produced by synchronous detection signal; With PN sequence information generator, it uses calculated distance to produce the PN sequence information, and makes the PN sequencer produce the PN sequence in response to the PN sequence information that produces.
11. a synchronous method that is used for the detected transmission frame comprises: produce the PN sequence by the PN sequencer; The symbol value of the symbol value of the PN sequence that is relatively produced by second working cell and the reception of transmission frame allowing the second integral device to carrying out integration from the signal that relatively produces, and produces second correlation; By the first and the 3rd working cell symbol value of the reception of the symbol value that extends to preamble and postamble in the code element of PN sequence and transmission frame relatively, with allow first and the third integral device respectively to from the signal integration that relatively produces and produce first and third phase pass value; Value that the first, the second and the third phase pass of being calculated more like this by synchronizing indicator is worth and predetermined first and second threshold values are to produce synchronous detection signal in conjunction with comparative result.
12. as the method for claim 11, wherein, this code element relatively be for using XOR gate to determine whether symbol value identical.
13. as the method for claim 11, wherein, this code element relatively be used for the code of code converter in response to the symbol value of PN sequence counter-rotating transmission frame code element.
14. as the method for claim 11, wherein, the step of this generation synchronous detection signal comprises: determine that by main peak value detector whether second correlation is greater than predetermined first threshold; If second correlation is greater than predetermined first threshold, then by multiplier with first and third phase pass value multiply each other; If with first and the third phase pass value that multiply each other greater than predetermined first threshold, then produce synchronous detection signal.
15. as the method for claim 11, wherein, the step of this generation synchronizing signal comprises: by multiplier with first and third phase pass value multiply each other; Whether first and the third phase pass value being determined to multiply each other by comparator be greater than predetermined second threshold value; If with first and the third phase pass value that multiply each other greater than predetermined second threshold value, and if second correlation greater than predetermined first threshold, produce synchronous detection signal by main peak value detector.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| KR1020060056482A KR20070121426A (en) | 2006-06-22 | 2006-06-22 | Apparatus for detecting synchronization of the signal and method thereof |
| KR1020060056482 | 2006-06-22 |
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| Publication Number | Publication Date |
|---|---|
| CN101094052A true CN101094052A (en) | 2007-12-26 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007101121431A Pending CN101094052A (en) | 2006-06-22 | 2007-06-19 | Apparatus and method for synchronising detecting transmit frames |
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| Country | Link |
|---|---|
| KR (1) | KR20070121426A (en) |
| CN (1) | CN101094052A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101588333B (en) * | 2008-05-22 | 2012-05-23 | 赵力 | Synchronization method suitable for terrestrial broadcasting national standard of Chinese digital televisions |
| JP2012244550A (en) * | 2011-05-23 | 2012-12-10 | Sony Corp | Reception device, and reception method |
| CN107872286A (en) * | 2017-12-31 | 2018-04-03 | 南京火零信息科技有限公司 | Use the frame-synchronizing device of double PN codes |
-
2006
- 2006-06-22 KR KR1020060056482A patent/KR20070121426A/en not_active Application Discontinuation
-
2007
- 2007-06-19 CN CNA2007101121431A patent/CN101094052A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101588333B (en) * | 2008-05-22 | 2012-05-23 | 赵力 | Synchronization method suitable for terrestrial broadcasting national standard of Chinese digital televisions |
| JP2012244550A (en) * | 2011-05-23 | 2012-12-10 | Sony Corp | Reception device, and reception method |
| CN107872286A (en) * | 2017-12-31 | 2018-04-03 | 南京火零信息科技有限公司 | Use the frame-synchronizing device of double PN codes |
| CN107872286B (en) * | 2017-12-31 | 2023-08-25 | 南京火零信息科技有限公司 | Frame synchronization device using double PN codes |
Also Published As
| Publication number | Publication date |
|---|---|
| KR20070121426A (en) | 2007-12-27 |
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Application publication date: 20071226 |