CN106953712B - Digital signal transmitting and receiving system and method - Google Patents
Digital signal transmitting and receiving system and method Download PDFInfo
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Abstract
A method for receiving and transmitting digital signal includes dividing data stream composed of multi-level symbols into continuous data frames for transmission when said digital signal is transmitted, adding preset information in each data frame for system synchronization, clock recovery, channel estimation and equalizer training, adding system information in each data frame for representing data information modulation mode, interleaving mode and DPC L coding rate, adding data information in each data frame, forming single first-order cycle by preset information, system information and data information, detecting and determining position of preset information when digital signal is received, using first symbol clock position after preset information as start of system information, detecting and determining position of system information, using first symbol clock position after system information as start of data information, carrying out signal processing on data information.
Description
This application is a divisional application of a patent application entitled "digital signal transmission/reception system and transmission/reception method" with an application date of 2006, 7/17/200610028998.1.
Technical Field
The present invention relates to the field of digital signal transmission technology, and more particularly, to a system and method for transmitting and receiving digital signals for system synchronization of digital terrestrial broadcast transmission.
Background
A wireless transmission system includes a transmitter and a receiver. Fig. 1 is a block diagram of a typical digitized wireless transmission system 100, the transmission process including: at the transmitting end 102, the digital signal from the signal source 104 is encoded first, and necessary auxiliary information, such as a synchronization signal, a pilot signal, etc., is added; the coded digital signal forms a baseband signal after channel filtering; the baseband signal is modulated to a corresponding frequency band by an up-converter and then transmitted. At the receiving end 106, if a tuner is provided, the down-conversion is not needed, and the tuner converts the high-frequency signal to a baseband and then obtains a digital signal through an analog-to-digital converter; the digital signal is restored to information consistent with the transmitting end after being processed by the signal processing terminal 108.
In the digital television terrestrial broadcasting transmission system, different transmission modes can be selected for transmitting data frames of different services. The channel coding structure corresponding to the terrestrial transmission mode with four code rates is shown in fig. 2.
The transmission method of the signal in the digital television terrestrial broadcasting system is as follows: the data stream composed of multilevel symbols transmitted in the digital transmission system is divided into a continuous data frame for transmission; each data frame comprises 3 parts, namely preset information, system information and data information, and a simple first-order loop is formed according to the preset information, the system information and the data information. Fig. 3 shows specific examples of frame structures of high-rate 32-QAM, 16-QAM, medium-rate 4-QAM and low-rate 4-QAM-NR employed in the digital tv terrestrial broadcasting transmission system, in which the preset information is implemented by a PN sequence of 595 bits; the system information is represented by one of a system information vector of a 4-bit two-level deterministic signal followed by 64 32-bit two-level symbol sequences, each data frame containing 3744 symbols of data information.
When the system transmits signals under the four modulation modes of 32-QAM, 16-QAM, 4-QAM and 4-QAM-NR, data descrambling is carried out in the processing process of the signals at a receiving end, which relates to the problem of determining the initial position of descrambling processing of the data, namely the synchronization of realizing the data descrambling, when the system transmits the signals under each modulation mode, symbol deinterleaving is carried out in the processing process of the signals at the receiving end, so that the problem of determining the initial position of deinterleaving processing of the data, namely the synchronization of realizing the symbol deinterleaving is solved, when the system transmits the signals under each modulation mode, the channel L DPC decoding is carried out in the processing process of the signals at the receiving end, the low-code-rate modulation mode is carried out in the processing process of the signals at the receiving end, and the problem of determining the initial position of channel L decoding and NR decoding processing of the data, namely the synchronization of realizing the channel L decoding of the DPC decoding and the synchronization of the channel NR decoding are also solved.
Disclosure of Invention
The invention aims to provide a digital signal receiving and transmitting method and a digital signal receiving and transmitting system which can be used for synchronizing channel decoding, symbol de-interleaving and data de-scrambling codes, aiming at the defects of the prior art.
According to a first aspect of the present invention, there is provided a digital signal transmission method for achieving system synchronization, comprising:
dividing a data stream composed of multilevel symbols into continuous data frames for transmission;
adding preset information in each data frame for system synchronization, clock recovery, channel estimation and equalizer training;
adding system information in each data frame, wherein the system information is used for representing a data information modulation mode, an interleaving mode and L DPC code rate of the data frame;
adding data information into each data frame; wherein the preset information, the system information and the data information form a simple first-order loop.
According to a second aspect of the present invention, there is provided a digital signal receiving method for achieving system synchronization, characterized in that a received digital signal includes at least preset information, system information, and data information, the receiving method comprising:
detecting and determining the position of preset information, and taking the first symbol clock position behind the preset information as the start of system information;
detecting and determining the position of system information, and taking the first symbol clock position after the system information as the start of data information;
the data information is signal processed.
Preferably, the position of the preset information is determined using an asynchronous correlator, comprising:
inputting the received data stream into an asynchronous correlator in series;
when the output value of the asynchronous correlator is the autocorrelation value, counting is started, if the output values of the asynchronous correlator are the autocorrelation value at k clock beats in the interval of N times continuously, the position is determined as the end position of the transmission of the preset information in the frame, and k is the sum of the system information and the data information symbol number in the data frame of the transmission system.
According to a third aspect of the present invention, there is provided a digital signal transceiving method for achieving system synchronization, comprising:
when the digital signal is transmitted, dividing a data stream composed of multilevel symbols into continuous data frames for transmission;
adding preset information in each data frame for system synchronization, clock recovery, channel estimation and equalizer training;
adding system information in each data frame, wherein the system information is used for representing a data information modulation mode, an interleaving mode and L DPC code rate of the data frame;
adding data information into each data frame; wherein the preset information, the system information and the data information form a simple first-order cycle;
when the digital signal is received, detecting and determining the position of preset information, and taking the first symbol clock position behind the preset information as the start of system information;
detecting and determining the position of system information, and taking the first symbol clock position after the system information as the start of data information;
the data information is signal processed.
Wherein the preset information is composed of m-bit PN sequences. The system information is formed by adding j bits of walsh sequence to the back of n bits of two-level definite signals; and the n + j bit system information is added after the m bit preset information.
Preferably, m is 595, n is 4, and j is 32.
The synchronization of the digital signal transceiving method for channel decoding may include the synchronization of channel L DPC decoding, channel NR decoding of digital television terrestrial transmission.
According to an embodiment of the present invention, the position of the preset information is determined using an asynchronous correlator, including:
inputting the received data stream into an asynchronous correlator in series;
when the output value of the asynchronous correlator is the autocorrelation value, counting is started, if the output values of the asynchronous correlator are the autocorrelation value at k clock beats in the interval of N times continuously, the position is determined as the end position of the transmission of the preset information in the frame, and k is the sum of the system information and the data information symbol number in the data frame of the transmission system.
Preferably, k is 3780 and N is 3.
According to a fourth aspect of the present invention, a digital signal transmitter for achieving system synchronization, comprises:
a data frame dividing means for dividing a data stream composed of multilevel symbols into continuous data frames;
the data transmission device transmits the data frame;
the preset information adding device is used for adding preset information in each data frame and used for system synchronization, clock recovery, channel estimation and equalizer training;
the system information adding device is used for adding system information in each data frame and is used for representing the data information modulation mode, the interleaving mode and the L DPC code rate of the frame;
data information adding means for adding data information to each of the data frames; wherein the preset information, the system information and the data information form a simple first-order loop.
According to a fifth aspect of the invention, a received digital signal comprises at least preset information, system information and data information, the receiver comprising:
a preset information position determining device for detecting and determining the position of the preset information, and taking the first symbol clock position after the preset information as the start of the system information;
system information position determining means for detecting and determining a position of the system information, with a first symbol clock position after the system information as a start of the data information;
and a data information processing device for performing signal processing on the data information.
Preferably, the preset information position determination means is an asynchronous correlator, wherein,
the asynchronous correlator receives the data stream in a serial input mode;
when the output value of the asynchronous correlator is the autocorrelation value, counting is started, if the output values of the asynchronous correlator are the autocorrelation value at k clock beats in the interval of N times continuously, the position is determined as the end position of the transmission of the preset information in the frame, and k is the sum of the system information and the data information symbol number in the data frame of the transmission system.
According to a sixth aspect of the present invention, there is provided a digital signal transmission/reception system for realizing system synchronization, comprising:
a digital signal transmitter includes, in combination,
a data frame dividing means for dividing a data stream composed of multilevel symbols into continuous data frames;
the data transmission device transmits the data frame;
the preset information adding device is used for adding preset information in each data frame and used for system synchronization, clock recovery, channel estimation and equalizer training;
the system information adding device is used for adding system information in each data frame and is used for representing the data information modulation mode, the interleaving mode and the L DPC code rate of the frame;
data information adding means for adding data information to each of the data frames; wherein the preset information, the system information and the data information form a simple first-order cycle;
a digital signal receiver, comprising,
a preset information position determining device for detecting and determining the position of the preset information, and taking the first symbol clock position after the preset information as the start of the system information;
system information position determining means for detecting and determining a position of the system information, with a first symbol clock position after the system information as a start of the data information;
and a data information processing device for performing signal processing on the data information.
The preset information added by the preset information adding device is composed of m-bit PN sequences. The system information added by the system information adding device is formed by adding j bits of walsh sequence after n bits of two-level definite signals; and the n + j bit system information is added after the m bit preset information.
Preferably, m is 595, n is 4, and j is 32.
The synchronization of the digital signal transceiving system for channel decoding may include synchronization of channel L DPC decoding, channel NR decoding of digital television terrestrial transmission.
According to an embodiment of the invention, said preset information position determining means is an asynchronous correlator, wherein
The asynchronous correlator receives the data stream in a serial input mode;
when the output value of the asynchronous correlator is the autocorrelation value, counting is started, if the output values of the asynchronous correlator are the autocorrelation value at k clock beats in the interval of N times continuously, the position is determined as the end position of the transmission of the preset information in the frame, and k is the sum of the system information and the data information symbol number in the data frame of the transmission system.
Preferably, k is 3780 and N is 3.
The method and the system of the invention determine the starting position of symbol de-interleaving, channel L DPC decoding, channel NR decoding or data de-scrambling according to the position of the preset information, and the system can realize the synchronization of symbol de-interleaving, the synchronization of channel L DPC decoding, the synchronization of channel NR decoding and the synchronization of data de-scrambling according to the starting position, and respectively complete de-symbol interleaving, channel L DPC decoding, channel NR decoding or data de-scrambling.
Drawings
The above and other features, properties and advantages of the present invention will become more apparent from the following description of embodiments thereof, taken in conjunction with the accompanying drawings, in which like reference characters refer to like features throughout, and in which:
FIG. 1 is a block diagram of a prior art digital transmission system;
fig. 2 is a block diagram of a channel coding structure of a digital tv terrestrial broadcasting transmission system;
FIG. 3 is a frame structure of high bit rate 32-QAM, 16-QAM, medium bit rate 4-QAM and low bit rate 4-QAM-NR;
fig. 4 is a block diagram of a transmitter according to an embodiment of the present invention;
FIG. 5 is a block diagram of a receiver according to an embodiment of the present invention;
FIG. 6 is a block diagram of a transceiver system according to an embodiment of the present invention;
FIG. 7 is a block diagram of an asynchronous correlator according to an embodiment of the present invention;
FIG. 8 is a workflow for synchronous symbol deinterleaving, channel decoding, and data descrambling using asynchronous correlation in accordance with an embodiment of the present invention;
FIG. 9 is a flow chart of a method of transmission according to an embodiment of the present invention;
fig. 10 is a flow chart of a receiving method according to an embodiment of the invention;
fig. 11 is a flowchart of a transceiving method according to an embodiment of the present invention.
Detailed Description
The technical scheme of the invention is further explained by combining the attached drawings.
The invention can realize the synchronization of channel L DPC decoding, the synchronization of channel NR decoding and the synchronization of data descrambling respectively.
Digital signal transmitter
First, according to an aspect of the present invention, there is provided a digital signal transmitter for implementing system synchronization, referring to a transmitter 400 according to an embodiment of the present invention shown in fig. 4, the transmitter 400 including:
the data frame dividing means 402 divides the data stream composed of multilevel symbols into consecutive data frames.
The data transmission device 404 transmits the data frame.
And a preset information adding device 406 for adding preset information in each data frame for system synchronization, clock recovery, channel estimation and equalizer training, wherein the preset information is formed by m-bit PN sequence.
And a system information adding device 408 for adding system information in each data frame for representing the data information modulation mode, the interleaving mode and the L DPC code rate of the frame, wherein the system information added by the system information adding device is formed by adding j bits of walsh sequence to the back of n bits of two-level known signal, and the n + j bits of system information are added to the back of m bits of preset information.
Data information adding means 410 for adding data information to each data frame; wherein the preset information, the system information and the data information form a simple first-order loop.
According to an embodiment of the present invention, the values of the parameters m, n, j in the components of the transmitter are as follows: m is 595, n is 4, j is 32.
Digital signal receiver
According to an aspect of the present invention, there is provided a digital signal receiver for implementing system synchronization, the digital signal received by the receiver includes at least preset information, system information and data information, and referring to a receiver 500 shown in fig. 5 according to an embodiment of the present invention, the receiver 500 includes:
a preset information position determining means 502 for detecting and determining the position of the preset information, and using the first symbol clock position after the preset information as the start of the system information;
system information position determining means 504 for detecting and determining a position of the system information, with a first symbol clock position after the system information as a start of the data information;
the data information processing device 506 performs signal processing on the data information. The signal processing of the data information includes synchronization symbol deinterleaving, channel decoding and data descrambling.
According to an embodiment of the present invention, the preset information position determining device 502 can be implemented by an asynchronous correlator, wherein,
the asynchronous correlator receives the data stream in a serial input mode;
when the output value of the asynchronous correlator is the autocorrelation value, counting is started, if the output values of the asynchronous correlator are the autocorrelation value at k clock beats in the interval of N times continuously, the position is determined as the end position of the transmission of the preset information in the frame, and k is the sum of the system information and the data information symbol number in the data frame of the transmission system.
According to an embodiment of the invention, the parameters in the various components of the receiver are as follows: k is 3780 and N is 3.
Further, according to an embodiment of the present invention, the asynchronous correlator may adopt a structure 700 as shown in fig. 7, which includes a plurality of D flip-flops 702a-n connected in sequence, where the output of each D flip-flop 702 is connected to the input of the next D flip-flop, and also connected to a corresponding multiplier 704a-n, the outputs of all the multipliers 704 are connected to an adder 706, and the output I of the adder 706 is used as the output of the asynchronous correlator 700.
The process of detecting the position of the preset information using the asynchronous correlator 700 is shown in fig. 8. the method of fig. 8 is a workflow 800 for synchronous symbol deinterleaving, channel decoding, and data descrambling using asynchronous correlation according to an embodiment of the present invention.
A received data signal stream, which may be an un-demapped data signal stream (synchronization process for symbol deinterleaving), a data signal stream without L DPC decoding (synchronization process for channel L DPC decoding) or a data information stream without NR decoding (synchronization process for channel NR decoding), is first serially input into an asynchronous correlator (step 802), the asynchronous correlator is always in an operating state, counting is started when the output value of the asynchronous correlator is an autocorrelation value (i.e., a maximum value) (step 804), if the output values of the asynchronous correlator are autocorrelation values for 3 consecutive times at an interval of 3780 clock beats, the position is determined as an end position of preset information transmission (step 806), symbol deinterleaving, channel L DPC decoding or channel NR decoding is performed on the following data information starting from the first symbol clock position after the position (step 808).
It should be noted that the value of N or k may take other values according to different applications, and the present invention does not limit the specific values of N and k.
Digital signal transmitting and receiving system
According to an aspect of the present invention, there is also provided a digital signal transceiving system for implementing system synchronization, referring to the transceiving system 600 shown in fig. 6 according to an embodiment of the present invention, where the transceiving system 600 includes:
the transmitter 602 includes:
the data frame dividing means 622 divides the data stream composed of multilevel symbols into consecutive data frames.
The data transmission device 624 transmits the data frame.
The preset information adding device 626 adds preset information in each data frame for system synchronization, clock recovery, channel estimation and equalizer training, wherein the preset information is composed of m-bit PN sequence.
And a system information adding device 628 for adding system information in each data frame, for representing the data information modulation mode, the interleaving mode and the L DPC coding rate of the frame, wherein the system information added by the system information adding device is formed by adding j bits of walsh sequence after n bits of two-level known signal, and the n + j bits of system information are added after m bits of preset information.
A data information adding means 630 for adding data information to each data frame; wherein the preset information, the system information and the data information form a simple first-order loop.
According to an embodiment of the present invention, the values of the parameters m, n, j in the components of the transmitter are as follows: m is 595, n is 4, j is 32.
The receiver 604 includes:
a preset information position determining means 642 for detecting a position of the preset information, and taking a first symbol clock position after the preset information as a start of the system information;
system information position determining means 644 for detecting and determining the position of the system information, with the first symbol clock position after the system information as the start of the data information;
the data information processing device 646 performs signal processing on the data information.
According to an embodiment of the present invention, the preset information position determining means 642 may be implemented by an asynchronous correlator, wherein,
the asynchronous correlator receives the data stream in a serial input mode;
when the output value of the asynchronous correlator is the autocorrelation value, counting is started, if the output values of the asynchronous correlator are the autocorrelation value at k clock beats in the interval of N times continuously, the position is determined as the end position of the transmission of the preset information in the frame, and k is the sum of the system information and the data information symbol number in the data frame of the transmission system.
According to an embodiment of the invention, the parameters in the various components of the receiver are as follows: k is 3780 and N is 3.
The digital signal transceiving system 600 can be used to achieve synchronization of symbol deinterleaving, channel decoding, and data descrambling, wherein the synchronization of the digital signal transceiving system for channel decoding comprises synchronization of channel L DPC decoding, channel NR decoding of digital television terrestrial transmissions.
Further, according to an embodiment of the present invention, the asynchronous correlator employed by the receiver 604 in the transceiving system 600 may also employ the structure 700 as shown in fig. 7, which includes a plurality of D flip-flops 702a-n connected in sequence, wherein the output of each D flip-flop 702 is connected to the input of the next D flip-flop, and is also connected to a corresponding multiplier 704a-n, the outputs of all multipliers 704 are connected to the adder 706, and the output I of the adder 706 is used as the output of the asynchronous correlator 700.
The process of detecting the position of the preset information using the asynchronous correlator 700 is also illustrated in fig. 8. the method of fig. 8 is a workflow 800 for synchronous symbol deinterleaving, channel decoding, and data descrambling using asynchronous correlation according to an embodiment of the present invention.
A received data signal stream, which may be an un-demapped data signal stream (synchronization process for symbol deinterleaving), a data signal stream without L DPC decoding (synchronization process for channel L DPC decoding) or a data information stream without NR decoding (synchronization process for channel NR decoding), is first serially input into an asynchronous correlator (step 802), the asynchronous correlator is always in an operating state, counting is started when the output value of the asynchronous correlator is an autocorrelation value (i.e., a maximum value) (step 804), if the output values of the asynchronous correlator are autocorrelation values for 3 consecutive times at an interval of 3780 clock beats, the position is determined as an end position of preset information transmission (step 806), symbol deinterleaving, channel L DPC decoding or channel NR decoding is performed on the following data information starting from the first symbol clock position after the position (step 808).
It should be noted that the value of N or k may take other values according to different applications, and the present invention does not limit the specific values of N and k.
Digital signal transmitting method
According to the present invention, there is also provided a digital signal transmitting method for implementing system synchronization, referring to fig. 9, where fig. 9 is a flowchart of the transmitting method according to the embodiment of the present invention, and the transmitting method 900 includes:
902. the data stream composed of multilevel symbols is divided into successive data frames for transmission.
904. Adding preset information in each data frame for system synchronization, clock recovery, channel estimation and equalizer training; wherein the preset information is composed of a PN sequence of m bits.
906. Adding system information in each data frame for representing the data information modulation mode, the interleaving mode and L DPC code rate of the frame, wherein the system information is formed by adding j-bit walsh sequence after n-bit two-level definite signal, and the n + j-bit system information is added after m-bit preset information.
908. Adding data information into each data frame; wherein the preset information, the system information and the data information form a simple first-order loop.
According to an embodiment of the present invention, values of parameters in the digital signal transmitting method 900 of the present invention are as follows: m is 595, n is 4, j is 32.
Digital signal receiving method
According to the present invention, there is also provided a digital signal receiving method for implementing system synchronization, where a received digital signal at least includes preset information, system information and data information, as shown in fig. 10, fig. 10 is a flowchart of the receiving method according to an embodiment of the present invention, and the receiving method 1000 includes:
1002. detecting and determining the position of preset information, and taking the first symbol clock position behind the preset information as the start of system information;
1004. detecting and determining the position of system information, and taking the first symbol clock position after the system information as the start of data information;
1006. the data information is signal processed.
According to an embodiment of the invention, the location of the preset information is determined using an asynchronous correlator, comprising:
inputting the received data stream into an asynchronous correlator in series;
when the output value of the asynchronous correlator is the autocorrelation value, counting is started, if the output values of the asynchronous correlator are the autocorrelation value at k clock beats in the interval of N times continuously, the position is determined as the end position of the transmission of the preset information in the frame, and k is the sum of the system information and the data information symbol number in the data frame of the transmission system.
According to an embodiment of the present invention, the parameter values in the receiving method 1000 are as follows: k is 3780 and N is 3.
Also, the process of detecting the position of the preset information using the asynchronous correlator is shown in fig. 8, including,
a received data signal stream, which may be an un-demapped data signal stream (synchronization process for symbol deinterleaving), a data signal stream without L DPC decoding (synchronization process for channel L DPC decoding) or a data information stream without NR decoding (synchronization process for channel NR decoding), is first serially input into an asynchronous correlator (step 802), the asynchronous correlator is always in an operating state, counting is started when the output value of the asynchronous correlator is an autocorrelation value (i.e., a maximum value) (step 804), if the output values of the asynchronous correlator are autocorrelation values for 3 consecutive times at an interval of 3780 clock beats, the position is determined as an end position of preset information transmission (step 806), symbol deinterleaving, channel L DPC decoding or channel NR decoding is performed on the following data information starting from the first symbol clock position after the position (step 808).
It should be noted that the value of N or k may take other values according to different applications, and the present invention does not limit the specific values of N and k.
Digital signal receiving and transmitting method
According to the present invention, there is also provided a digital signal transceiving method for implementing system synchronization, as shown in fig. 11, fig. 11 is a flowchart of the transceiving method according to an embodiment of the present invention, where the transceiving method 1100 includes:
1102. the data stream composed of multilevel symbols is divided into successive data frames for transmission.
1104. Adding preset information in each data frame for system synchronization, clock recovery, channel estimation and equalizer training; wherein the preset information is composed of a PN sequence of m bits.
1106. Adding system information in each data frame for representing the data information modulation mode, the interleaving mode and L DPC code rate of the frame, wherein the system information is formed by adding j-bit walsh sequence after n-bit two-level definite signal, and the n + j-bit system information is added after m-bit preset information.
1108. Adding data information into each data frame; wherein the preset information, the system information and the data information form a simple first-order loop. According to an embodiment of the present invention, values of parameters in the digital signal transceiving method 1100 of the present invention are as follows: m is 595, n is 4, j is 32.
1110. Detecting and determining the position of preset information, and taking the first symbol clock position behind the preset information as the start of system information;
1112. detecting and determining the position of system information, and taking the first symbol clock position after the system information as the start of data information;
1114. the data information is signal processed. The signal processing of the data information includes synchronization symbol deinterleaving, channel decoding and data descrambling.
The digital signal transceiving method 1100 of the present invention can be used to achieve synchronization of symbol deinterleaving, channel decoding, and data descrambling, the synchronization of the digital signal transceiving method for channel decoding can include synchronization of channel L DPC decoding, channel NR decoding of digital television terrestrial transmission.
According to an embodiment of the invention, the location of the preset information is determined using an asynchronous correlator, comprising:
inputting the received data stream into an asynchronous correlator in series;
when the output value of the asynchronous correlator is the autocorrelation value, counting is started, if the output values of the asynchronous correlator are the autocorrelation value at k clock beats in the interval of N times continuously, the position is determined as the end position of the transmission of the preset information in the frame, and k is the sum of the system information and the data information symbol number in the data frame of the transmission system.
According to an embodiment of the present invention, the parameter values in the receiving method 1000 are as follows: k is 3780 and N is 3.
Also, the process of detecting the position of the preset information using the asynchronous correlator is shown in fig. 8, including,
a received data signal stream, which may be an un-demapped data signal stream (synchronization process for symbol deinterleaving), a data signal stream without L DPC decoding (synchronization process for channel L DPC decoding) or a data information stream without NR decoding (synchronization process for channel NR decoding), is first serially input into an asynchronous correlator (step 802), the asynchronous correlator is always in an operating state, counting is started when the output value of the asynchronous correlator is an autocorrelation value (i.e., a maximum value) (step 804), if the output values of the asynchronous correlator are autocorrelation values for 3 consecutive times at an interval of 3780 clock beats, the position is determined as an end position of preset information transmission (step 806), symbol deinterleaving, channel L DPC decoding or channel NR decoding is performed on the following data information starting from the first symbol clock position after the position (step 808).
It should be noted that the value of N or k may take other values according to different applications, and the present invention does not limit the specific values of N and k.
Summary of the invention
The invention relates to a digital signal receiving and transmitting method and a system thereof, which determine the starting position of symbol de-interleaving, channel L DPC decoding, channel NR decoding or data de-scrambling according to the position of preset information, and the system can realize the synchronization of symbol de-interleaving, the synchronization of channel L DPC decoding, the synchronization of channel NR decoding and the synchronization of data de-scrambling according to the starting position, and respectively complete de-symbol interleaving, channel L DPC decoding, channel NR decoding or data de-scrambling.
The embodiments described above are provided to enable persons skilled in the art to make or use the invention and that modifications or variations can be made to the embodiments described above by persons skilled in the art without departing from the inventive concept of the present invention, so that the scope of protection of the present invention is not limited by the embodiments described above but should be accorded the widest scope consistent with the innovative features set forth in the claims.
Claims (24)
1. A digital signal transmission method for achieving system synchronization, comprising:
dividing a data stream composed of multilevel symbols into continuous data frames for transmission;
adding preset information in each data frame for system synchronization, clock recovery, channel estimation and equalizer training, wherein the position of the preset information is determined by using a correlator, and the starting position of symbol de-interleaving, channel L DPC decoding, channel NR decoding or data descrambling is determined according to the position of the preset information;
adding system information in each data frame, wherein the system information is used for representing a data information modulation mode, an interleaving mode and L DPC code rate of the data frame;
adding data information into each data frame; wherein the preset information, the system information and the data information form a simple first-order loop.
2. The digital signal transmission method for achieving system synchronization of claim 1, wherein the preset information is comprised of a PN sequence of m bits.
3. The digital signal transmission method for achieving system synchronization according to claim 1, wherein the system information is composed of a walsh sequence of n bits of a two-level signal followed by j bits; and the n + j bit system information is added after the m bit preset information.
4. The method of claim 3, wherein m is 595, n is 4, and j is 32.
5. A digital signal receiving method for achieving system synchronization, wherein a received digital signal includes at least preset information, system information, and data information, the receiving method comprising:
detecting and determining the position of preset information, wherein the position of the preset information is determined by using a correlator, and the position of the first symbol information after the preset information is used as the start of system information;
detecting and determining the position of system information, and taking the position of the first symbol information after the system information as the beginning of data information;
the data information is signal-processed and L DPC-decoded, and a start position of symbol deinterleaving, channel L DPC decoding, channel NR decoding, or data descrambling is determined according to a position of the preset information.
6. The digital signal receiving method as claimed in claim 5, wherein the position of the preset information is determined using a correlator, comprising:
inputting the received data stream into a correlator in series;
when the output value of the correlator is the autocorrelation value, counting is started, if the output values of the correlator are the autocorrelation value at the interval of k clock beats for N times continuously, the position is determined as the end position of the transmission of the preset information in the frame, and k is the sum of the number of symbols in the data frame of the transmission system.
7. A method for transmitting and receiving digital signals for system synchronization, comprising:
when the digital signal is transmitted, dividing a data stream composed of multilevel symbols into continuous data frames for transmission;
adding preset information in each data frame for system synchronization, clock recovery, channel estimation and equalizer training, and determining the starting position of symbol de-interleaving, channel L DPC decoding, channel NR decoding or data descrambling according to the position of the preset information;
adding system information in each data frame, wherein the system information is used for representing a data information modulation mode, an interleaving mode and L DPC code rate of the data frame;
adding data information into each data frame; wherein 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 determined by using a correlator, the position of the preset information is detected and determined, and the position of the first symbol information after the preset information is used as the start of system information;
detecting and determining the position of system information, and taking the position of the first symbol information after the system information as the beginning of data information;
the data information is signal processed.
8. The digital signal transceiving method of claim 7,
the preset information is composed of m-bit PN sequences.
9. The digital signal transceiving method of claim 7,
the system information is formed by adding j-bit walsh sequences to the back of n-bit two-level signals; and the n + j bit system information is added after the m bit preset information.
10. The digital signal transceiving method of claim 9,
m is 595, n is 4, and j is 32.
11. The digital signal transceiving method of any one of claims 7 to 10,
the digital signal transceiving method is used for realizing synchronization of symbol de-interleaving, channel decoding and data descrambling.
12. The digital signal transceiving method of claim 7,
the digital signal transceiving method is used for synchronizing channel decoding, including the synchronization of channel L DPC decoding and channel NR decoding of digital television ground transmission.
13. A digital signal transmitter for implementing system synchronization, comprising:
a data frame dividing means for dividing a data stream composed of multilevel symbols into continuous data frames;
the data transmission device transmits the data frame;
preset information adding device, adding preset information in each data frame for system synchronization, clock recovery, channel estimation and equalizer training, the position of the preset information is determined by a correlator, and the starting position of symbol de-interleaving, channel L DPC decoding, channel NR decoding or data de-scrambling is determined according to the position of the preset information;
the system information adding device is used for adding system information in each data frame and is used for representing the data information modulation mode, the interleaving mode and the L DPC code rate of the frame;
data information adding means for adding data information to each of the data frames; wherein the preset information, the system information and the data information form a simple first-order loop.
14. The digital signal transmitter for achieving system synchronization of claim 13, wherein the preset information is comprised of a PN sequence of m bits.
15. The digital signal transmitter for realizing system synchronization of claim 13, wherein the system information is comprised of a walsh sequence of n bits of a two-level signal followed by j bits; and the n + j bit system information is added after the m bit preset information.
16. The digital signal transmitter for implementing system synchronization of claim 15, wherein m is 595, n is 4, and j is 32.
17. A digital signal receiver for performing system synchronization, wherein the received digital signal includes at least preset information, system information and data information, the receiver comprising:
a preset information position determining means for detecting and determining a position of preset information, which is determined using the correlator, with a first symbol information position after the preset information as a start of system information;
the system information position determining device detects and determines the position of system information, and takes the position of the first symbol information after the system information as the beginning of data information, wherein the system information is used for representing the data information modulation mode, the interleaving mode and L DPC code rate of the frame;
a data information processing device for processing the data information and performing L DPC decoding,
wherein the start position of the symbol deinterleaving, the channel L DPC decoding, the channel NR decoding, or the data descrambling code is determined according to the position of the preset information.
18. The digital signal receiver of claim 17, wherein said preset information position determining means is an asynchronous correlator, wherein,
the asynchronous correlator receives the data stream in a serial input mode;
when the output value of the asynchronous correlator is the autocorrelation value, counting is started, if the output values of the asynchronous correlator are the autocorrelation value at k clock beats continuously for N times, the position is determined as the end position of the transmission of the preset information in the frame, and k is the sum of the preset information, the system information and the data information symbol number in the data frame of the transmission system.
19. A digital signal transceiving system for achieving system synchronization, comprising:
a digital signal transmitter includes, in combination,
a data frame dividing means for dividing a data stream composed of multilevel symbols into continuous data frames;
the data transmission device transmits the data frame;
the preset information adding device is used for adding preset information in each data frame, is used for system synchronization, clock recovery, channel estimation and equalizer training, and determines the initial position of symbol de-interleaving, channel L DPC decoding, channel NR decoding or data descrambling according to the position of the preset information;
the system information adding device is used for adding system information in each data frame and is used for representing the data information modulation mode, the interleaving mode and the L DPC code rate of the frame;
data information adding means for adding data information to each of the data frames; wherein the preset information, the system information and the data information form a simple first-order cycle;
a digital signal receiver, comprising,
a preset information position determining means for detecting and determining a position of preset information, which is determined using the correlator, with a first symbol information position after the preset information as a start of system information;
system information position determining means for detecting and determining a position of the system information with a first symbol information position after the system information as a start of the data information;
and a data information processing device for performing signal processing on the data information.
20. The digital signal transceiving system of claim 19,
the preset information added by the preset information adding device is composed of m-bit PN sequences.
21. The digital signal transceiving system of claim 19,
the system information added by the system information adding device is formed by adding j bits of walsh sequence after n bits of two-level signals; and the n + j bit system information is added after the m bit preset information.
22. The digital signal transceiving system of claim 21,
m is 595, n is 4, and j is 32.
23. The digital signal transceiving system of any of claims 19 to 22,
the digital signal receiving and transmitting system is used for realizing synchronization of symbol de-interleaving, channel decoding and data descrambling.
24. The digital signal transceiving system of claim 19,
the digital signal transceiving system is used for synchronizing channel decoding, including the synchronization of channel L DPC decoding and channel NR decoding of digital television ground transmission.
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| CN201110150002.5A CN106953712B (en) | 2006-07-17 | 2006-07-17 | Digital signal transmitting and receiving system and method |
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| CN2006100289981A CN101110626B (en) | 2006-07-17 | 2006-07-17 | Digital signal emitting and receiving system and method thereof |
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| CN1617580A (en) * | 2003-11-13 | 2005-05-18 | 上海交通大学 | Signal transmission method in digital signal transmission system |
| CN1617579A (en) * | 2003-11-13 | 2005-05-18 | 上海交通大学 | Signal transmission method in digital TV ground broadcast 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 |
| CN1838728A (en) * | 2006-04-24 | 2006-09-27 | 上海交通大学 | Synchronous method for channel decodable bit interleave or rescrambling code in digital television ground transmission |
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| 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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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1617580A (en) * | 2003-11-13 | 2005-05-18 | 上海交通大学 | Signal transmission method in digital signal transmission system |
| CN1617579A (en) * | 2003-11-13 | 2005-05-18 | 上海交通大学 | Signal transmission method in digital TV ground broadcast 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 |
| CN1838728A (en) * | 2006-04-24 | 2006-09-27 | 上海交通大学 | Synchronous method for channel decodable bit interleave or rescrambling code in digital television ground transmission |
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| CN103067117B (en) | 2015-08-05 |
| CN103067117A (en) | 2013-04-24 |
| CN101110626B (en) | 2012-01-04 |
| HK1117657A1 (en) | 2009-01-16 |
| CN106953712A (en) | 2017-07-14 |
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