CN103067117A - Digital-signal transmit-receive system and transmit-receive method thereof - Google Patents
Digital-signal transmit-receive system and transmit-receive method thereof Download PDFInfo
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Abstract
The invention discloses a digital-signal transmit-receive method. The method comprises the following steps that when the digital signal is emitted, a data flow formed by multilevel symbols is divided into continuous data frames and is transmitted; preset information is added in the each data frame and is used for system synchronization, clock recovery, channel estimation and equalizer training; system information is added in the each data frame and is used to characterize a frame data modulation mode, an interweaving mode and an LDPC encoding rate; data information is added in the each data frame; the preset information, the system information and the data information form a simple first-order cycle; when the digital signal is received, the position of the preset information is detected and determined and a first symbol clock position after the preset information is taken as a beginning of the system information; the position of the system information is detected and determined and the first symbol clock position after the system information is taken as the beginning of the data information; and signal processing is performed on the data information. The invention also provides a digital-signal transmit-receive system.
Description
The application is to be on July 17th, 2006 applying date, and application number is 200610028998.1, and name is called the dividing an application of patent application of " digital signal receive-transmit system and receiving/transmission method ".
Technical field
The present invention relates to digital signal transmission technique field, more particularly, relate to a kind of digital signal receive-transmit system and receiving/transmission method that is applicable to the system synchronization of digital ground broadcast transmission.
Background technology
Wireless transmitting system comprises transmitter and receiver.Fig. 1 is the block diagram of typical digital radio transmission system 100, and transmission course comprises: at transmitting terminal 102, at first to from signal source 104 encoding digital signals, add necessary supplementary, such as synchronous signal, pilot signal etc. again; Digital signal behind the coding forms baseband signal through behind the channel filtering; This baseband signal sends after being modulated onto corresponding frequency band through up converter.At receiving terminal 106, if tuner is arranged, then down-conversion needn't be arranged, tuner transforms to base band with high-frequency signal and obtains digital signal by analog to digital converter; Be resumed into the information consistent with transmitting terminal after the processing of this digital signal through signal processing terminal 108.
In digital television ground broadcast transmission system, the Frame of transmission different business can select to adopt different transmission modes.The corresponding chnnel coding structure of the terrestrial transmission pattern of four kinds of code checks as shown in Figure 2.
The transmission method of signal is such in digital tv ground broadcasting: the data flow that is comprised of many level symbols of transmitting in the digital transmission system is divided into continuous one by one Frame and transmits; Each Frame comprises 3 parts, is respectively preset information, system information and data message, and forms simple single order circulation with this.Fig. 3 has shown the high code check 32-QAM that digital television ground broadcast transmission system adopts, 16-QAM, and the object lesson of the frame structure of middle code check 4-QAM and low code check 4-QAM-NR, wherein preset information is realized by 595 PN sequence; System information is added an expression in 64 32 the system information vector of two level symbol sequences by 4 two level deterministic signal back, comprise the data message of 3744 symbols in each Frame.
Under above-mentioned 32-QAM, 16-QAM, 4-QAM and four kinds of modulating modes of 4-QAM-NR during the system transmissions signal, all to carry out data scrambling code decoding at receiving terminal in to the processing procedure of signal, this just relates to how to confirm data is carried out the original position that descrambling code is processed, and namely how to realize the stationary problem of data scrambling code decoding.Under each modulating mode during the system transmissions signal, all to carry out symbolic solution at receiving terminal in to the processing procedure of signal and interweave; So just relate to how to confirm data are carried out the original position that deinterleaving is processed, namely how to realize the stationary problem that symbolic solution interweaves.Under each modulating mode during the system transmissions signal, all to carry out channel LDPC decoding at receiving terminal in to the processing procedure of signal; Low code check modulating mode will carry out channel NR decoding at receiving terminal in to the processing procedure of signal; Same, also relate to the original position that how to confirm carries out channel LDPC decoding, NR decoding processing to data, namely how to realize the stationary problem of channel LDPC decoding, and the stationary problem of channel NR decoding.
Summary of the invention
The objective of the invention is for the deficiencies in the prior art, provide a kind of and can be used for channel-decoding, symbolic solution interweaves and synchronous digital signal receiving/transmission method and the receive-transmit system of data scrambling code decoding.The present invention can realize respectively channel LDPC decoding synchronously, channel NR decoding synchronously and data scrambling code decoding synchronously.Method of the present invention goes in the digital tv ground broadcasting.
According to a first aspect of the invention, provide a kind of digital signal launching technique for realizing system synchronization, comprising:
The data flow that many level symbols are formed is divided into continuous Frame and transmits;
In each described Frame, add preset information, be used for system synchronization, clock recovery, channel estimating and equalizer training;
Add-on system information in each described Frame is used for characterizing this frame of data information modulating mode, interlace mode and LDPC encoder bit rate;
Add data message in each described Frame; Wherein said preset information, system information and data message form simple single order circulation.
According to a second aspect of the invention, provide a kind of digital signal reception method for realizing system synchronization, it is characterized in that received digital signal comprises preset information, system information and data message at least, described method of reseptance comprises:
Detect the position of determining preset information, with first symbol clock position after this preset information, as the beginning of system information;
Detect the position of determining system information, with first symbol clock position after this system information, as the beginning of data message;
Data message is carried out signal to be processed.
Better, the position of described preset information is determined with asynchronous correlator, being comprised:
With the asynchronous correlator of data flow serial input that receives;
When asynchronous correlator output valve is autocorrelation value, begin counting, if N continuous is when time asynchronous correlator output valve all is autocorrelation value when interval k timeticks, determine that this position is the end position of preset information transmission in this frame, described k is system information and data message symbolic number sum in the transmission system Frame.
According to a third aspect of the invention we, provide a kind of digital signal receiving/transmission method for realizing system synchronization, comprising:
When launching described digital signal, the data flow that many level symbols are formed is divided into continuous Frame and transmits;
In each described Frame, add preset information, be used for system synchronization, clock recovery, channel estimating and equalizer training;
Add-on system information in each described Frame is used for characterizing this frame of data information modulating mode, interlace mode and LDPC encoder bit rate;
Add data message in each described Frame; Wherein said preset information, system information and data message form simple single order circulation;
When receiving described digital signal, detect the position of determining preset information, with first symbol clock position after this preset information, as the beginning of system information;
Detect the position of determining system information, with first symbol clock position after this system information, as the beginning of data message;
Data message is carried out signal to be processed.
Wherein, described preset information is made of the PN sequence of m position.The walsh sequence that described system information is added the j position by two level deterministic signal back of n position consists of; And after the system information of described n+j position is added on the preset information of m position.
Better, described m is that 595, n is that 4, j is 32.
According to embodiments of the invention, described digital signal receiving/transmission method be used for to realize that symbolic solution interweaves, channel-decoding and data scrambling code decoding synchronously.What the channel LDPC that can comprise synchronously digital TV ground transmission that this digital signal receiving/transmission method is used for channel-decoding decoded, channel NR decodes is synchronous.
According to embodiments of the invention, the position of described preset information is determined with asynchronous correlator, being comprised:
With the asynchronous correlator of data flow serial input that receives;
When asynchronous correlator output valve is autocorrelation value, begin counting, if N continuous is when time asynchronous correlator output valve all is autocorrelation value when interval k timeticks, determine that this position is the end position of preset information transmission in this frame, described k is system information and data message symbolic number sum in the transmission system Frame.
Better, described k is that 3780, N is 3.
According to a forth aspect of the invention, a kind of digital signal transmitters for realizing system synchronization comprises:
The Frame segmenting device, the data flow that many level symbols are formed is divided into continuous Frame;
Data transmission device transmits described Frame;
The preset information adding set adds preset information in each described Frame, be used for system synchronization, clock recovery, channel estimating and equalizer training;
The system information adding set, add-on system information in each described Frame is used for characterizing this frame of data information modulating mode, interlace mode and LDPC encoder bit rate;
The data message adding set adds data message in each described Frame; Wherein said preset information, system information and data message form simple single order circulation.
According to a fifth aspect of the invention, received digital signal comprises preset information, system information and data message at least, and described receiver comprises:
The preset information position determining means detects the position of determining preset information, with first symbol clock position after this preset information, as the beginning of system information;
The system information position determining means detects the position of determining system information, with first symbol clock position after this system information, as the beginning of data message;
The processing data information device carries out signal to data message and processes.
Better, described preset information position determining means is asynchronous correlator, wherein,
Described asynchronous correlator receives described data flow with serial input mode;
When asynchronous correlator output valve is autocorrelation value, begin counting, if N continuous is when time asynchronous correlator output valve all is autocorrelation value when interval k timeticks, determine that this position is the end position of preset information transmission in this frame, described k is system information and data message symbolic number sum in the transmission system Frame.
According to a sixth aspect of the invention, provide a kind of digital signal receive-transmit system for realizing system synchronization, it is characterized in that, comprising:
Digital signal transmitters comprises,
The Frame segmenting device, the data flow that many level symbols are formed is divided into continuous Frame;
Data transmission device transmits described Frame;
The preset information adding set adds preset information in each described Frame, be used for system synchronization, clock recovery, channel estimating and equalizer training;
The system information adding set, add-on system information in each described Frame is used for characterizing this frame of data information modulating mode, interlace mode and LDPC encoder bit rate;
The data message adding set adds data message in each described Frame; Wherein said preset information, system information and data message form simple single order circulation;
Digital signal receiver comprises,
The preset information position determining means detects the position of determining preset information, with first symbol clock position after this preset information, as the beginning of system information;
The system information position determining means detects the position of determining system information, with first symbol clock position after this system information, as the beginning of data message;
The processing data information device carries out signal to data message and processes.
Wherein, the preset information of described preset information adding set interpolation is made of the PN sequence of m position.The walsh sequence that the system information that described system information adding set adds is added the j position by two level deterministic signal back of n position consists of; And after the system information of described n+j position is added on the preset information of m position.
Better, described m is that 595, n is that 4, j is 32.
According to embodiments of the invention, this digital signal receive-transmit system can be used for realizing that symbolic solution interweaves, channel-decoding and data scrambling code decoding synchronously.What the channel LDPC that can comprise synchronously digital TV ground transmission that this digital signal receive-transmit system is used for channel-decoding decoded, channel NR decodes is synchronous.
According to embodiments of the invention, described preset information position determining means is asynchronous correlator, wherein
Described asynchronous correlator receives described data flow with serial input mode;
When asynchronous correlator output valve is autocorrelation value, begin counting, if N continuous is when time asynchronous correlator output valve all is autocorrelation value when interval k timeticks, determine that this position is the end position of preset information transmission in this frame, described k is system information and data message symbolic number sum in the transmission system Frame.
Better, described k is that 3780, N is 3.
The inventive method and system determine that according to the position of preset information symbolic solution interweaves, channel LDPC decodes, channel NR decodes or the original position of data scrambling code decoding, system can according to this original position realize that symbolic solution interweaves synchronously, channel LDPC decoding synchronously, channel NR decoding synchronously and data scrambling code decoding synchronously, finish respectively and separate symbol interleaving, channel LDPC decoding, channel NR decoding or data scrambling code decoding.The present invention is with respect to the synchronous catching method of 4 level section among the ATSC, and the method for this PN related synchronization has faster acquisition speed, and simultaneously, because the gain that PN is correlated with is very large, antijamming capability is stronger.
Description of drawings
The above and other features of the present invention, character and advantage will be by becoming more obvious below in conjunction with accompanying drawing to the description of embodiment, and in the accompanying drawings, identical Reference numeral represents identical feature all the time, wherein:
Fig. 1 is the block diagram of digital transmission system of the prior art;
Fig. 2 is digital television ground broadcast transmission system chnnel coding structured flowchart;
Fig. 3 is high code check 32-QAM, 16-QAM, the frame structure of middle code check 4-QAM and low code check 4-QAM-NR;
Fig. 4 is the block diagram of transmitter according to an embodiment of the invention;
Fig. 5 is the block diagram of receiver according to an embodiment of the invention;
Fig. 6 is the block diagram of receive-transmit system according to an embodiment of the invention;
Fig. 7 is asynchronous according to an embodiment of the invention correlator configuration figure;
Fig. 8 is for adopting the asynchronous workflow of carrying out synchronizing symbol deinterleaving, channel-decoding and data scrambling code decoding of closing mutually according to embodiments of the invention;
Fig. 9 is the flow chart of launching technique according to an embodiment of the invention;
Figure 10 is the flow chart of method of reseptance according to an embodiment of the invention;
Figure 11 is the flow chart of receiving/transmission method according to an embodiment of the invention.
Embodiment
Further specify technical scheme of the present invention below in conjunction with accompanying drawing.
The purpose of this invention is to provide and a kind ofly can be used for channel-decoding, symbolic solution interweaves and synchronous digital signal receiving/transmission method and the receive-transmit system of data scrambling code decoding.The present invention can realize respectively channel LDPC decoding synchronously, channel NR decoding synchronously and data scrambling code decoding synchronously.Method of the present invention goes in the digital tv ground broadcasting.
Digital signal transmitters
At first, according to an aspect of the present invention, provide a kind of digital signal transmitters for realizing system synchronization, with reference to the transmitter 400 according to one embodiment of the invention shown in Figure 4, this transmitter 400 comprises:
Frame segmenting device 402, the data flow that many level symbols are formed is divided into continuous Frame.
Preset information adding set 406 adds preset information in each Frame, be used for system synchronization, clock recovery, channel estimating and equalizer training, and wherein, this preset information is made of the PN sequence of m position.
System information adding set 408, add-on system information in each Frame is used for characterizing this frame of data information modulating mode, interlace mode and LDPC encoder bit rate; Wherein, the system information of this system information adding set interpolation is made of the walsh sequence of the interpolation j position, two level deterministic signal back of n position; And after the system information of n+j position is added on the preset information of m position.
Data message adding set 410 adds data message in each Frame; Wherein preset information, system information and data message form simple single order circulation.
According to one embodiment of the invention, the value of the parameter m in all parts of this transmitter, n, j is as follows: m is that 595, n is that 4, j is 32.
Digital signal receiver
According to an aspect of the present invention, a kind of digital signal receiver for realizing system synchronization is provided, this receiver received digital signal comprises preset information, system information and data message at least, with reference to the receiver 500 according to one embodiment of the invention shown in Figure 5, this receiver 500 comprises:
Preset information position determining means 502 detects the position of determining preset information, with first symbol clock position after this preset information, as the beginning of system information;
System information position determining means 504 detects the position of determining system information, with first symbol clock position after this system information, as the beginning of data message;
Processing data information device 506 carries out signal to data message and processes.Data message is carried out the signal processing comprise synchronizing symbol deinterleaving, channel-decoding and data scrambling code decoding.
According to one embodiment of the invention, preset information position determining means 502 wherein can be realized by asynchronous correlator, wherein,
This asynchronous correlator is with the serial input mode receiving data stream;
When asynchronous correlator output valve is autocorrelation value, begin counting, if N continuous is when time asynchronous correlator output valve all is autocorrelation value when interval k timeticks, determine that this position is the end position of preset information transmission in this frame, k is system information and data message symbolic number sum in the transmission system Frame.
According to one embodiment of the invention, the parameter in all parts of this receiver is as follows: k is that 3780, N is 3.
Further, according to one embodiment of the invention, described asynchronous correlator can adopt structure 700 as shown in Figure 7, it comprises the d type flip flop 702a-n that several connect successively, the output of each d type flip flop 702 is connected to the input of next d type flip flop, be also connected to simultaneously a corresponding multiplier 704a-n, the output of all multipliers 704 is connected to adder 706, and the output I of adder 706 is as the output of asynchronous correlator 700.
Utilize this asynchronous correlator 700 to detect to determine preset information the position process as shown in Figure 8, the method for Fig. 8 is for adopting the asynchronous workflow 800 of carrying out synchronizing symbol deinterleaving, channel-decoding and data scrambling code decoding of closing mutually according to embodiments of the invention.
With the flows of data signals that receives, this flows of data signals can be the flows of data signals (being used for the synchronizing process that symbolic solution interweaves) of not separating mapping, without the flows of data signals (synchronizing process that is used for channel LDPC decoding) of LDPC decoding or the data message stream (synchronizing process that is used for channel NR decoding) of decoding without NR, this data flow is the asynchronous correlator of serial input (step 802) at first, asynchronous correlator is in running order all the time, begins counting (step 804) when asynchronous correlator output valve is autocorrelation value (being maximum); If continuous 3 times at the interval during 3780 timeticks asynchronous correlator output valve be autocorrelation value all, determine that this position is the end position (step 806) of preset information transmission.First symbol clock position behind this position is as starting point, to after data message as symbolic solution interweave, channel LDPC decoding or channel N R decoding (step 808).
Need to prove, but the value of N k can be got according to different application other value, the present invention does not limit the concrete value of N and k.
The digital signal receive-transmit system
According to an aspect of the present invention, also provide a kind of digital signal receive-transmit system for realizing system synchronization, with reference to the receive-transmit system 600 according to one embodiment of the invention shown in Figure 6, this receive-transmit system 600 comprises:
Transmitter 602 comprises:
Preset information adding set 626 adds preset information in each Frame, be used for system synchronization, clock recovery, channel estimating and equalizer training, and wherein, this preset information is made of the PN sequence of m position.
System information adding set 628, add-on system information in each Frame is used for characterizing this frame of data information modulating mode, interlace mode and LDPC encoder bit rate; Wherein, the system information of this system information adding set interpolation is made of the walsh sequence of the interpolation j position, two level deterministic signal back of n position; And after the system information of n+j position is added on the preset information of m position.Data message adding set 630 adds data message in each Frame; Wherein preset information, system information and data message form simple single order circulation.
According to one embodiment of the invention, the value of the parameter m in all parts of this transmitter, n, j is as follows: m is that 595, n is that 4, j is 32.
Receiver 604 comprises:
Preset information position determining means 642 detects the position of determining preset information, with first symbol clock position after this preset information, as the beginning of system information;
System information position determining means 644 detects the position of determining system information, with first symbol clock position after this system information, as the beginning of data message;
Processing data information device 646 carries out signal to data message and processes.
According to one embodiment of the invention, preset information position determining means 642 wherein can be realized by asynchronous correlator, wherein,
This asynchronous correlator is with the serial input mode receiving data stream;
When asynchronous correlator output valve is autocorrelation value, begin counting, if N continuous is when time asynchronous correlator output valve all is autocorrelation value when interval k timeticks, determine that this position is the end position of preset information transmission in this frame, k is system information and data message symbolic number sum in the transmission system Frame.
According to one embodiment of the invention, the parameter in all parts of this receiver is as follows: k is that 3780, N is 3.
This digital signal receive-transmit system 600 can be used for realizing that symbolic solution interweaves, channel-decoding and data scrambling code decoding synchronously.Wherein, the digital signal receive-transmit system be used for channel-decoding the channel LDPC decoding that comprises synchronously digital TV ground transmission, channel NR decoding synchronously.
Further, according to one embodiment of the invention, the asynchronous correlator that receiver 604 in this receive-transmit system 600 adopts also can adopt structure 700 as shown in Figure 7, it comprises the d type flip flop 702a-n that several connect successively, the output of each d type flip flop 702 is connected to the input of next d type flip flop, be also connected to simultaneously a corresponding multiplier 704a-n, the output of all multipliers 704 is connected to adder 706, and the output I of adder 706 is as the output of asynchronous correlator 700.
Utilize this asynchronous correlator 700 to detect to determine preset information the position process equally as shown in Figure 8, the method for Fig. 8 is for adopting the asynchronous workflow 800 of carrying out synchronizing symbol deinterleaving, channel-decoding and data scrambling code decoding of closing mutually according to embodiments of the invention.
With the flows of data signals that receives, this flows of data signals can be the flows of data signals (being used for the synchronizing process that symbolic solution interweaves) of not separating mapping, without the flows of data signals (synchronizing process that is used for channel LDPC decoding) of LDPC decoding or the data message stream (synchronizing process that is used for channel NR decoding) of decoding without NR, this data flow is the asynchronous correlator of serial input (step 802) at first, asynchronous correlator is in running order all the time, begins counting (step 804) when asynchronous correlator output valve is autocorrelation value (being maximum); If continuous 3 times at the interval during 3780 timeticks asynchronous correlator output valve be autocorrelation value all, determine that this position is the end position (step 806) of preset information transmission.First symbol clock position behind this position is as starting point, to after data message as symbolic solution interweave, channel LDPC decoding or channel NR decoding (step 808).
Need to prove, but the value of N k can be got according to different application other value, the present invention does not limit the concrete value of N and k.
The digital signal launching technique
According to the present invention, a kind of digital signal launching technique for realizing system synchronization also is provided, with reference to shown in Figure 9, Fig. 9 is the flow chart of launching technique according to an embodiment of the invention, this launching technique 900 comprises:
902. the data flow that many level symbols are formed is divided into continuous Frame and transmits.
904. in each Frame, add preset information, be used for system synchronization, clock recovery, channel estimating and equalizer training; Wherein preset information is made of the PN sequence of m position.
906. add-on system information in each Frame is used for characterizing this frame of data information modulating mode, interlace mode and LDPC encoder bit rate; Wherein system information is made of the walsh sequence of the interpolation j position, two level deterministic signal back of n position; And after the system information of n+j position is added on the preset information of m position.
908. add data message in each Frame; Wherein preset information, system information and data message form simple single order circulation.
According to one embodiment of the invention, the value of each parameter is as follows in the digital signal launching technique 900 of the present invention: m is that 595, n is that 4, j is 32.
Digital signal reception method
According to the present invention, a kind of digital signal reception method for realizing system synchronization also is provided, received digital signal comprises preset information, system information and data message at least, with reference to shown in Figure 10, Figure 10 is the flow chart of method of reseptance according to an embodiment of the invention, and this method of reseptance 1000 comprises:
1002. detect the position of determining preset information, with first symbol clock position after this preset information, as the beginning of system information;
1004. detect the position of determining system information, with first symbol clock position after this system information, as the beginning of data message;
1006. data message is carried out signal to be processed.
According to one embodiment of the invention, the position of preset information is determined with asynchronous correlator, being comprised:
With the asynchronous correlator of data flow serial input that receives;
When asynchronous correlator output valve is autocorrelation value, begin counting, if N continuous is when time asynchronous correlator output valve all is autocorrelation value when interval k timeticks, determine that this position is the end position of preset information transmission in this frame, described k is system information and data message symbolic number sum in the transmission system Frame.
According to one embodiment of the invention, the parameter value in the described method of reseptance 1000 is as follows: k is that 3780, N is 3.
Equally, utilize asynchronous correlator to detect to determine preset information the position process as shown in Figure 8, comprise,
With the flows of data signals that receives, this flows of data signals can be the flows of data signals (being used for the synchronizing process that symbolic solution interweaves) of not separating mapping, without the flows of data signals (synchronizing process that is used for channel LDPC decoding) of LDPC decoding or the data message stream (synchronizing process that is used for channel NR decoding) of decoding without NR, this data flow is the asynchronous correlator of serial input (step 802) at first, asynchronous correlator is in running order all the time, begins counting (step 804) when asynchronous correlator output valve is autocorrelation value (being maximum); If continuous 3 times at the interval during 3780 timeticks asynchronous correlator output valve be autocorrelation value all, determine that this position is the end position (step 806) of preset information transmission.First symbol clock position behind this position is as starting point, to after data message as symbolic solution interweave, channel LDPC decoding or channel NR decoding (step 808).
Need to prove, but the value of N k can be got according to different application other value, the present invention does not limit the concrete value of N and k.
The digital signal receiving/transmission method
According to the present invention, a kind of digital signal receiving/transmission method for realizing system synchronization also is provided, as shown in figure 11, Figure 11 is the flow chart of receiving/transmission method according to an embodiment of the invention, this receiving/transmission method 1100 comprises:
1102. the data flow that many level symbols are formed is divided into continuous Frame and transmits.
1104. in each Frame, add preset information, be used for system synchronization, clock recovery, channel estimating and equalizer training; Wherein preset information is made of the PN sequence of m position.
1106. add-on system information in each Frame is used for characterizing this frame of data information modulating mode, interlace mode and LDPC encoder bit rate; Wherein system information is made of the walsh sequence of the interpolation j position, two level deterministic signal back of n position; And after the system information of n+j position is added on the preset information of m position.
1108. add data message in each Frame; Wherein preset information, system information and data message form simple single order circulation.Wherein, according to one embodiment of the invention, the value of each parameter is as follows in the digital signal receiving/transmission method 1100 of the present invention: m is that 595, n is that 4, j is 32.
1110. detect the position of determining preset information, with first symbol clock position after this preset information, as the beginning of system information;
1112. detect the position of determining system information, with first symbol clock position after this system information, as the beginning of data message;
1114. data message is carried out signal to be processed.Data message is carried out the signal processing comprise synchronizing symbol deinterleaving, channel-decoding and data scrambling code decoding.
Digital signal receiving/transmission method 1100 of the present invention can be used for realizing that symbolic solution interweaves, channel-decoding and data scrambling code decoding synchronously.What the channel LDPC that can comprise synchronously digital TV ground transmission that this digital signal receiving/transmission method is used for channel-decoding decoded, channel NR decodes is synchronous.
According to one embodiment of the invention, the position of preset information is determined with asynchronous correlator, being comprised:
With the asynchronous correlator of data flow serial input that receives;
When asynchronous correlator output valve is autocorrelation value, begin counting, if N continuous is when time asynchronous correlator output valve all is autocorrelation value when interval k timeticks, determine that this position is the end position of preset information transmission in this frame, described k is system information and data message symbolic number sum in the transmission system Frame.
According to one embodiment of the invention, the parameter value in the described method of reseptance 1000 is as follows: k is that 3780, N is 3.
Equally, utilize asynchronous correlator to detect to determine preset information the position process as shown in Figure 8, comprise,
With the flows of data signals that receives, this flows of data signals can be the flows of data signals (being used for the synchronizing process that symbolic solution interweaves) of not separating mapping, without the flows of data signals (synchronizing process that is used for channel LDPC decoding) of LDPC decoding or the data message stream (synchronizing process that is used for channel NR decoding) of decoding without NR, this data flow is the asynchronous correlator of serial input (step 802) at first, asynchronous correlator is in running order all the time, begins counting (step 804) when asynchronous correlator output valve is autocorrelation value (being maximum); If continuous 3 times at the interval during 3780 timeticks asynchronous correlator output valve be autocorrelation value all, determine that this position is the end position (step 806) of preset information transmission.First symbol clock position behind this position is as starting point, to after data message as symbolic solution interweave, channel LDPC decoding or channel NR decoding (step 808).
Need to prove, but the value of N k can be got according to different application other value, the present invention does not limit the concrete value of N and k.
Sum up
Digital signal receiving/transmission method of the present invention and system determine that according to the position of preset information symbolic solution interweaves, channel LDPC decodes, channel NR decodes or the original position of data scrambling code decoding, system can according to this original position realize that symbolic solution interweaves synchronously, channel LDPC decoding synchronously, channel NR decoding synchronously and data scrambling code decoding synchronously, finish respectively and separate symbol interleaving, channel LDPC decoding, channel NR decoding or data scrambling code decoding.The present invention is with respect to the synchronous catching method of 4 level section among the ATSC, and the method for this PN related synchronization has faster acquisition speed, and simultaneously, because the gain that PN is correlated with is very large, antijamming capability is stronger.
Above-described embodiment provides to being familiar with the person in the art and realizes or use of the present invention; those skilled in the art can be in the situation that does not break away from invention thought of the present invention; above-described embodiment is made various modifications or variation; thereby protection scope of the present invention do not limit by above-described embodiment, and should be the maximum magnitude that meets the inventive features that claims mention.
Claims (19)
1. a digital signal launching technique is characterized in that, comprising:
The data flow that many level symbols are formed is divided into continuous Frame and transmits;
Add preset information in each described Frame, be used for system synchronization, clock recovery, channel estimating and equalizer training, described preset information is made of the PN sequence of m position;
Add-on system information in each described Frame is used for characterizing this frame of data information modulating mode, interlace mode and LDPC encoder bit rate, and the walsh sequence that described system information is added the j position by two level signal back of n position consists of; And after the system information of described n+j position is added on the preset information of m position;
Add data message in each described Frame; Wherein said preset information, system information and data message form simple single order circulation.
2. digital signal launching technique as claimed in claim 1 is characterized in that, described m is that 595, n is that 4, j is 32.
3. a digital signal reception method is characterized in that, received digital signal comprises preset information, system information and data message at least, and described preset information is made of the PN sequence of m position; Described method of reseptance comprises:
Determine the position of preset information by the PN coherent detection of relative preset information, with first symbol clock position after this preset information, as the beginning of system information;
Detect the position of determining system information, with first symbol clock position after this system information, as the beginning of data message;
Data message is carried out signal process, and carry out the LDPC decoding.
4. digital signal reception method as claimed in claim 3 is characterized in that, the walsh sequence that described system information is added the j position by two level signal back of n position consists of; And after the system information of described n+j position is added on the preset information of m position.
5. digital signal reception method as claimed in claim 4 is characterized in that, described m is that 595, n is that 4, j is 32.
6. a digital signal receiving/transmission method is characterized in that, comprising:
When launching described digital signal, the data flow that many level symbols are formed is divided into continuous Frame and transmits;
Add preset information in each described Frame, be used for system synchronization, clock recovery, channel estimating and equalizer training, described preset information is made of the PN sequence of m position;
Add-on system information in each described Frame is used for characterizing this frame of data information modulating mode, interlace mode and LDPC encoder bit rate;
Add data message in each described Frame; Wherein said preset information, system information and the data message relative order in Frame is constant;
When receiving described digital signal, determine the position of preset information by the PN coherent detection of relative preset information, with first symbol clock position after this preset information, as the beginning of system information;
Detect the position of determining system information, with first symbol clock position after this system information, as the beginning of data message;
Data message is carried out signal process, and carry out the LDPC decoding.
7. digital signal receiving/transmission method as claimed in claim 6 is characterized in that,
The walsh sequence that described system information is added the j position by two level signal back of n position consists of; And after the system information of described n+j position is added on the preset information of m position.
8. digital signal receiving/transmission method as claimed in claim 7 is characterized in that,
Described m is that 595, n is that 4, j is 32.
9. such as each described digital signal receiving/transmission method among the claim 6-8, it is characterized in that,
Described digital signal receiving/transmission method be used for to realize that symbolic solution interweaves, channel-decoding and data scrambling code decoding synchronously.
10. digital signal receiving/transmission method as claimed in claim 6 is characterized in that,
Described digital signal receiving/transmission method is used for the synchronous of channel-decoding, comprises synchronous that the channel LDPC of digital TV ground transmission decodes, channel NR decodes.
11. a digital signal transmitters is characterized in that, comprising:
The Frame segmenting device, the data flow that many level symbols are formed is divided into continuous Frame;
Data transmission device transmits described Frame;
The preset information adding set adds preset information in each described Frame, be used for system synchronization, clock recovery, channel estimating and equalizer training, and described preset information is made of the PN sequence of m position;
The system information adding set, add-on system information in each described Frame is used for characterizing this frame of data information modulating mode, interlace mode and LDPC encoder bit rate, and the walsh sequence that described system information is added the j position by two level signal back of n position consists of; And after the system information of described n+j position is added on the preset information of m position;
The data message adding set adds data message in each described Frame; Wherein said preset information, system information and the data message relative order in Frame is constant.
12. digital signal transmitters as claimed in claim 11 is characterized in that, described m is that 595, n is that 4, j is 32.
13. a digital signal receiver is characterized in that received digital signal comprises preset information, system information and data message at least, described preset information is made of the PN sequence of m position;
Described receiver comprises:
The preset information position determining means is determined the position of preset information by the PN coherent detection of relative preset information, with first symbol clock position after this preset information, as the beginning of system information;
The system information position determining means, detect the position of determining system information, with first symbol clock position after this system information, as the beginning of data message, described system information is used for characterizing this frame of data information modulating mode, interlace mode and LDPC encoder bit rate;
The processing data information device carries out signal to data message and processes, and carries out the LDPC decoding.
14. digital signal receiver as claimed in claim 13 is characterized in that, the walsh sequence that described system information is added the j position by two level signal back of n position consists of; And after the system information of described n+j position is added on the preset information of m position.
15. a digital signal receive-transmit system is characterized in that, comprising:
Digital signal transmitters comprises,
The Frame segmenting device, the data flow that many level symbols are formed is divided into continuous Frame;
Data transmission device transmits described Frame;
The preset information adding set adds preset information in each described Frame, be used for system synchronization, clock recovery, channel estimating and equalizer training;
The system information adding set, add-on system information in each described Frame is used for characterizing this frame of data information modulating mode, interlace mode and LDPC encoder bit rate;
The data message adding set adds data message in each described Frame; Wherein said preset information, system information and the data message order in Frame is constant;
Digital signal receiver comprises,
The preset information position determining means is determined the position of preset information by the coherent detection of relative preset information, with first symbol clock position after this preset information, as the beginning of system information;
The system information position determining means detects the position of determining system information, with first symbol clock position after this system information, as the beginning of data message;
The processing data information device carries out signal to data message and processes, and carries out the LDPC decoding.
16. digital signal receive-transmit system as claimed in claim 15 is characterized in that,
Described preset information is made of the PN sequence of m position; The walsh sequence that the system information that described system information adding set adds is added the j position by two level signal back of n position consists of; And after the system information of described n+j position is added on the preset information of m position.
17. digital signal receive-transmit system as claimed in claim 16 is characterized in that,
Described m is that 595, n is that 4, j is 32.
18. such as each described digital signal receive-transmit system among the claim 15-17, it is characterized in that,
Described digital signal receive-transmit system be used for to realize that symbolic solution interweaves, channel-decoding and data scrambling code decoding synchronously.
19. digital signal receive-transmit system as claimed in claim 15 is characterized in that,
Described digital signal receive-transmit system is used for the synchronous of channel-decoding, comprises synchronous that the channel LDPC of digital TV ground transmission decodes, channel NR decodes.
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| CN1617579A (en) * | 2003-11-13 | 2005-05-18 | 上海交通大学 | Signal transmission method in digital TV ground broadcast transmission system |
| CN1617580A (en) * | 2003-11-13 | 2005-05-18 | 上海交通大学 | Signal transmission method in digital signal transmission system |
| CN1638314A (en) * | 2004-02-06 | 2005-07-13 | 上海交通大学 | Signal transmission method of digital TV ground transmission system |
| CN1642276A (en) * | 2004-03-29 | 2005-07-20 | 上海交通大学 | Mixed transmission method in digital television ground troadcasting transmission system |
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| CN100373917C (en) * | 2006-04-24 | 2008-03-05 | 上海交通大学 | Synchronous method for channel decodable bit interleave or rescrambling code in digital television ground transmission |
| CN1852282A (en) * | 2006-04-24 | 2006-10-25 | 上海交通大学 | Channel decoding and symbol demapping synchronizing method |
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| CN1617579A (en) * | 2003-11-13 | 2005-05-18 | 上海交通大学 | Signal transmission method in digital TV ground broadcast transmission system |
| CN1617580A (en) * | 2003-11-13 | 2005-05-18 | 上海交通大学 | Signal transmission method in digital signal transmission system |
| CN1638314A (en) * | 2004-02-06 | 2005-07-13 | 上海交通大学 | Signal transmission method of digital TV ground transmission system |
| CN1642276A (en) * | 2004-03-29 | 2005-07-20 | 上海交通大学 | Mixed transmission method in digital television ground troadcasting transmission system |
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| CN103067117B (en) | 2015-08-05 |
| CN106953712A (en) | 2017-07-14 |
| CN101110626A (en) | 2008-01-23 |
| CN101110626B (en) | 2012-01-04 |
| HK1117657A1 (en) | 2009-01-16 |
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Address after: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee after: Hisense Video Technology Co., Ltd Address before: 266100 Zhuzhou Road, Laoshan District, Shandong, No. 151, No. Patentee before: HISENSE ELECTRIC Co.,Ltd. |