CN101640790A - Method and system for identifying frame header - Google Patents
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- CN101640790A CN101640790A CN200810129982A CN200810129982A CN101640790A CN 101640790 A CN101640790 A CN 101640790A CN 200810129982 A CN200810129982 A CN 200810129982A CN 200810129982 A CN200810129982 A CN 200810129982A CN 101640790 A CN101640790 A CN 101640790A
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Abstract
The invention provides a method for identifying a frame header, which is applicable to a digital terrestrial multimedia broadcasting (DTMB) system and comprises the following steps of: firstly, receiving a packet which comprises a plurality of frames each of which comprises a header and a data extent, wherein each header corresponds to one of a plurality of transmission modes and the plurality oftransmission modes correspond to a specific sequence respectively; secondly, carrying out a correlation operation between a header of the plurality of frames and the header of a corresponding specificframe so as to generate a plurality of results corresponding to the transmission modes; and, finally, identifying the transmission mode of the header according to the plurality of results.
Description
Technical field
The present invention is relevant for a kind of frame header (frame header) discrimination method and system, particularly relevant for a kind of method and the system that can distinguish the transmission mode of the frame header that Digital Television Terrestrial Broadcasting (DTMB) transmission system is used.
Background technology
Along with multimedia progress is quick, the user is to multimedia service also more and more requirement.Therefore, China has formulated the transmission standard that Digital Television Terrestrial Broadcasting (Digital Terrestrial Multimedia Broadcast is hereinafter to be referred as DTMB) transmission system standard is used as the digital television signal of China's use.Because in the DTMB transmission system standard that China is formulated, for the difference transmission that single carrier and multicarrier are provided is used, worked out the frame header (frame header) of three kinds of different lengths, having used length respectively is the pseudo noise sequence (pseudo noise sequence is hereinafter to be referred as the PN sequence) of 420,595 and 945 characters (symbol).In the frame header pattern of using length 420 and length 945 characters, different subframes can be selected to use identical or different PN sequences, so the digital television signal that transmits of transmission end just has the selection that multiple PN sequence may transmission mode.Receiving terminal must correctly pick out the transmission mode of the frame header that transmits the transmission end, just can obtain correct data interval and be deciphered, and produces required digital television service.
Generally speaking, for the employed transmission mode of PN sequence that obtains transmitting at receiving terminal, can produce corresponding local PN sequence earlier at receiving terminal, utilize sliding window technique (sliding window) and the signal that receives to carry out adding up of related operation (correlation) again, by finding corresponding maximum accumulated value, the transmission mode of the PN sequence that obtains transmitting.Yet, the factor affecting that this traditional approach is subjected to frequency drift is very big, when frequency drift produces, make that not only required computing time and the complexity of transmission mode of judging the PN sequence of transmitting significantly increases, also make become quite long the time of delay of whole system.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of identifying frame header method and system, can not be subjected to the transmission mode that frequency drift influences and can obtain fast the PN sequence, to reduce the time of delay of whole system.
To achieve these goals, the invention provides a kind of identifying frame header method, be applicable to digital TV ground multimedia broadcasting (DTMB) system.The identifying frame header method comprises the following steps.At first, receive a package, wherein package comprises a plurality of frames, and each frame has a header and a data interval, and header is corresponding to one of a plurality of transmission modes, and wherein said a plurality of transmission modes correspond respectively to a particular sequence.Then, the header of the particular frame that one header of described a plurality of frames is corresponding with carries out related operation, produces a plurality of operation results corresponding to described a plurality of transmission modes.Afterwards, according to described a plurality of operation results, pick out the transmission mode of header.
To achieve these goals, the present invention provides a kind of identifying frame header system in addition, is applicable to digital TV ground multimedia broadcasting (DTMB) system.The identifying frame header system comprises a storage element, a correlation value calculation unit, an operation result generation unit and an identifying frame header unit.Storage element is in order to receive and to store the input signal from a DTMB package, and wherein package comprises a plurality of frames, and each frame has a header and a data interval, and header corresponds respectively to a particular sequence corresponding to one of a plurality of transmission modes and transmission mode.The header of the particular frame that the correlation value calculation unit is corresponding with one header of described a plurality of frames carries out a related operation and obtains correlation.The operation result generation unit receives the correlation that the correlation value calculation unit produces, and produces a plurality of operation results corresponding to described a plurality of transmission modes.The identifying frame header unit picks out the used transmission mode of header according to an operation result and an established rule.
To achieve these goals, the present invention provides a kind of identifying frame header method in addition, is applicable to digital TV ground multimedia broadcasting (DTMB) system, and it comprises the following steps.At first, receive a package, wherein package comprises a plurality of frames, and each frame has a header and a data interval, and described header is corresponding to one of a plurality of transmission modes, and wherein said a plurality of transmission modes correspond respectively to a particular sequence.Then, this header of the particular frame that one header of described a plurality of frames is corresponding with carries out related operation, and produces an operation result of one corresponding to described a plurality of transmission modes.Wherein, if the operation result of a transmission mode surpasses a set value, the transmission mode of decision header is above-mentioned transmission mode.
For above and other objects of the present invention, feature and advantage can be become apparent, cited below particularlyly go out preferred embodiment, and cooperate appended accompanying drawing, be described in detail below.
Description of drawings
Fig. 1 is the schematic diagram that shows according to the DTMB package of the embodiment of the invention;
Fig. 2 is the schematic diagram of demonstration according to the PN sequence of the various transmission modes of the embodiment of the invention;
Fig. 3 is the flow chart of demonstration one according to the identifying frame header method of the embodiment of the invention;
Fig. 4 is the flow chart of demonstration one according to the transmission mode determining method of the embodiment of the invention;
Fig. 5 shows another flow chart according to the transmission mode determining method of the embodiment of the invention;
Fig. 6 is the schematic diagram that shows according to the frame header detecting system of one embodiment of the invention.
[primary clustering symbol description]
100～package;
110～frame;
112～header;
114～data division;
PN0-PN5～pseudo noise sequence;
S310-S330～execution in step;
S410-S450～execution in step;
S510-S530～execution in step;
600～frame header detecting system;
610～storage element;
620～correlation value calculation unit;
630～operation result generation unit;
640～identifying frame header unit;
R ()～received signal;
∧ ()～operation result.
Embodiment
For instance, in DTMB transmission system standard, provide the transmission end multiple transmission mode selection, therefore, a kind of identifying frame header method and system thereof are provided in the embodiment of the invention, use to postpone relevant (delaycorrelation) computing, the PN sequence of variable (rotated) or fixing (fixed) is carried out self-related operation, obtain the relevant accumulated value of oneself.Simultaneously, utilize variable PN sequence differing two frame characters (frame symbol) between the time, its PN sequence differences is not to be exactly characteristic of (i.e. character) that moves right a bit to moving to left, the time of two frame characters of fixed delay subtracts the time of a character (symbol), or the time that adds a character carry out relevant the adding up of oneself of variable PN sequence, judge the transmission mode of PN sequence whereby.Wherein, for instance, the selection mode of the transmission mode of PN sequence can be following arbitrary mode: (a) if there is relevant accumulated value to surpass default set point; (b) utilize whole section relevant accumulated value, find out maximum; Or (c) utilize whole section relevant accumulated value, and find out maximum standard deviation, can obtain the transmission mode of PN sequence, but be not limited thereto.
Fig. 1 shows the schematic diagram according to the DTMB package of the embodiment of the invention.As shown in the figure, comprise a plurality of frames (frame) 110 in the package 100, each frame all has a header (frame header) 112 and one data interval (frame body) 114, and each frame 110 has equal length.Wherein, header 112 has three kinds of possible length, is respectively 420,595 and 945 characters, and data interval 114 is a regular length then, is 3780 characters.Comprise a specific PN sequence in the header 112.The PN sequence that is comprised in the header can be variable (rotated) sequence of fixing sequence or PN sequence.In the present embodiment, the variable sequence of PN sequence is represented to have and PN sequence identical data, but arranges different () sequences for example: to moving to left or moving right a bit.Therefore, in the present embodiment, the PN sequence of header has five kinds of possible transmission modes, it is the fixedly PN sequence of 420 characters that first kind of transmission mode adopts length, it is the variable sequence of the fixedly PN sequence of 420 characters that second kind of transmission mode adopts length, it is the fixedly PN sequence of 595 characters that the third transmission mode adopts length, and it is the fixedly PN sequence of 945 characters that the 4th kind of transmission mode adopts length, and it is the variable sequence of the fixedly PN sequence of 945 characters that the 5th kind of transmission mode adopts length.In order to further specify, please refer to following explanation.
Suppose that PN420, PN595 and PN945 represent that respectively length is the PN sequence of 420,595 and 945 characters.Below enumerating the demonstration PN sequence content of first transmission mode, is example with fixing PN420, and its length is 420 characters.20 characters in front of supposing the PN sequence are as follows:
-1，1，-1，-1，1，1，1，1，-1，1，-1，1，1，-1，1，-1，-1，-1，-1，1
Then the demonstration PN sequence of second transmission mode (being the variable sequence of PN420) can utilize preceding 20 characters of following frame to be illustrated, wherein frame index 0-5 preceding 6 packages of representing in the package respectively to be received.
-1，1，-1，-1，1 ，1，1，1，-1，1 ，-1，1，1，-1，1 ，-1，-1，-1，-1，1
... this is the first two ten signal of frame index 0
1，-1，-1，1，1 ，1，1，-1，1，-1 ，1，1，-1，1，-1 ，-1，-1，-1，1，-1
... this is the first two ten signal of frame index 1
-1，-1，1，-1，-1 ，1，1，1，1，-1 ，1，-1，1，1，-1 ，1，-1，-1，-1，-1
... this is the first two ten signal of frame index 2
-1，-1，1，1，1 ，1，-1，1，-1，1 ，1，-1，1，-1，-1 ，-1，-1，1，-1，1
... this is the first two ten signal of frame index 3
-1，-1，-1，1，-1 ，-1，1，1，1，1 ，-1，1，-1，1，1 ，-1，1，-1，-1，-1
... this is the first two ten signal of frame index 4
-1，1，1，1，1 ，-1，1，-1，1，1 ，-1，1，-1，-1，-1 ，-1，1，-1，1，1
... this is the first two ten signal of frame index 5
By above-mentioned PN sequence PN420 as can be known, obviously the PN sequence of frame index 2 is generation of PN sequence displacement to the right of frame index 0, and the PN sequence of frame index 4 is generation of PN sequence displacement to the right of frame index 2, and the PN sequence of frame index 3 be the PN sequence of frame index 1 to generation of left dislocation, and the PN sequence of frame index 5 is that the PN sequence of frame index 3 is to generation of left dislocation.
Similarly, the demonstration PN sequence of the 3rd transmission mode (promptly fixedly PN595), its length is 595 characters.20 characters in front of supposing the PN sequence are as follows:
-1，1，1，1，1，1，1，1，1，1，-1，1，1，-1，1，1，-1，1，1，-1，.......
Because PN sequence PN595 is used for single carrier transmission, therefore under this pattern, the PN sequence of transmission is fixing sequence, that is the PN sequence of frame index 0-5 is identical.
Next, enumerating the demonstration PN sequence content of the 4th transmission mode, suppose that PN945 represents that length is 945 PN sequence, is example with fixing PN945, and its length is 945 characters.20 characters in front of supposing the PN sequence are as follows:
-1，-1，-1，-1，-1 ，1，-1，-1，-1，1 ，1，-1，1，-1，1 ，1，1，-1，-1，1
It is as follows then to use the transmission mode (i.e. the 5th transmission mode) of the variable sequence of PN945 to be used as the resulting frame of its header:
-1，-1，-1，-1，-1 ，1，-1，-1，-1，1 ，1，-1，1，-1，1 ，1，1，-1，-1，1
... this is the first two ten signal of frame index 0
-1，-1，-1，-1，1 ，-1，-1，-1，1，1 ，-1，1，-1，1，1 ，1，-1，-1，1，-1
... this is the first two ten signal of frame index 1
1，-1，-1，-1，-1 ，-1，1，-1，-1，-1 ，1，1，-1，1，-1 ，1，1，1，-1，-1
... this is the first two ten signal of frame index 2
-1，-1，-1，1，-1 ，-1，-1，1，1，-1 ，1，-1，1，1，1 ，-1，-1，1，-1，-1
... this is the first two ten signal of frame index 3
1，1，-1，-1，-1 ，-1，-1，1，-1，-1， -1，1，1，-1，1， -1，1，1，1，-1
... this is the first two ten signal of frame index 4
-1，-1，1，-1，-1 ，-1，1，1，-1，1 ，-1，1，1，1，-1，-1，1，-1，-1，1
... this is the first two ten signal of frame index 5
Similarly, by above-mentioned PN sequence PN945 as can be known, obviously the PN sequence of frame index 2 is generation of PN sequence displacement to the right of frame index 0, and the PN sequence of frame index 4 is generation of PN sequence displacement to the right of frame index 2; And the PN sequence of frame index 3 be the PN sequence of frame index 1 to generation of left dislocation, and the PN sequence of frame index 5 is that the PN sequence of frame index 3 is to generation of left dislocation.
Fig. 2 shows the schematic diagram according to the PN sequence of the various transmission modes of the embodiment of the invention.As shown in Figure 2, in first transmission mode, because of using fixing PN420 sequence, so the employed PN sequence of the header of frame index 0-5 PN0 to PN5 is identical fixedly PN420 sequence.In second transmission mode, because of using the variable sequence of PN420 sequence, therefore the PN sequence PN2 of frame index 2 is one of the PN sequence PN0 displacement to the right of frame index 0, and the PN sequence PN4 of frame index 4 is one of the PN sequence PN2 displacement to the right of frame index 2, and the PN sequence PN3 of frame index 3 be the PN sequence PN1 of frame index 1 to one of left dislocation, and the PN sequence PN5 of frame index 5 is that the PN sequence PN3 of frame index 3 is to one of left dislocation.In the 3rd transmission mode, because of using fixing PN595 sequence, so the employed PN sequence of the header of frame index 0-5 PN0 to PN5 is identical fixedly PN595 sequence.In the 4th transmission mode, because of using fixing PN945 sequence, so the employed PN sequence of the header of frame index 0-5 PN0 to PN5 is identical fixedly PN945 sequence.In the 5th transmission mode, because of using the variable sequence of PN945 sequence, therefore the PN sequence PN2 of frame index 2 is one of the PN sequence PN0 displacement to the right of frame index 0, and the PN sequence PN4 of frame index 4 is one of the PN sequence PN2 displacement to the right of frame index 2, and the PN sequence PN3 of frame index 3 be the PN sequence PN1 of frame index 1 to one of left dislocation, and the PN sequence PN5 of frame index 5 is that the PN sequence PN3 of frame index 3 is to one of left dislocation.From the above, variable PN sequence is differing (for example: frame index 3 and frame index 1 or frame index 4 and frame index 2) between two frame character times, its PN sequence differences is not to be exactly to move right a bit to moving to left, and header of one of them frame character time representation adds the total time of a data part.For instance, if use the PN420 sequence, then a frame character time equals the 420+3780=4200 character time; If use the PN595 sequence, then a frame character time equals the 595+3780=4375 character time; And if use the PN945 sequence, then a frame character time equals the 945+3780=4725 character time, by that analogy.
Please refer to Fig. 3, demonstration one is applicable to a DTMB system according to the flow chart 300 of the identifying frame header method of the embodiment of the invention.At first, as step S310, receive a package (package 100 for example shown in Figure 1), wherein package comprises the frame of a plurality of same format, and each frame has a header and a data interval, and a plurality of sampling points are arranged in the header, and 420 sampling points are for example arranged among the PN420.Note that each header corresponding to a kind of transmission mode, and transmission mode is corresponding to a particular sequence.This particular sequence is the variable sequence of a PN sequence or this PN sequence.Then, as step S320, the header of the particular frame that the header of the wherein frame in the package that receives is corresponding with carries out related operation, and produces the operation result corresponding to transmission mode.In this step, can obtain a plurality of correlations by each sampling point of the header of a frame of package is carried out related operation with a corresponding sampling point of the header of corresponding particular frame, then, again these correlations are added up, and then obtain an operation result.Wherein, corresponding particular frame is positioned at before the present received frame, in other words, its for received or postpone both frame of measured length.For instance, in the present embodiment, corresponding particular frame and the frame that receives at present two frame lengths (for example frame 3 is corresponding to frame 1, and frame 2 is corresponding to frame 0) of being separated by, wherein frame length is the length that comprises frame header and data division.
Can be expressed as following mathematical equation for the pairing correlation of each transmission mode.In the following equation, suppose that variable PN sequence is for moving right a bit.
Wherein, the input data that r () expression receives, d, k be the express time index respectively, the input signal of r (d) expression receiver, the output signal of r (d-k) expression holder, and the relevant output valve that adds up of ∧ (d) expression oneself.First formula to the, five formulas are then represented first kind of result of calculation to the 5th kind of pairing correlation of transmission mode respectively.For instance, ∧
Pn420-fixedExpression uses fixing PN420 sequence to be used as first kind of pairing result of calculation of transmission mode of header, ∧
Pn420-rotatedExpression uses variable PN420 sequence to be used as second kind of pairing result of calculation of transmission mode of header, by that analogy.
By above-listed first formula to the, five formulas as can be known, if when the transmission mode of the PN sequence of transmission end is first kind of transmission mode, the result of calculation ∧ of first formula then
Pn420-fixedTo level off to 1, and the result of calculation ∧ of second formula
Pn420-rotatedTo level off to 0, the result of calculation of other formula can be less than ∧
Pn420-fixed, the transmission mode that therefore can tell the PN sequence of transmission end is first kind of transmission mode.Similarly, if when the transmission mode of the PN sequence of transmission end is second kind of transmission mode, the result of calculation ∧ of first formula then
Pn420-fixedTo level off to 0, and the result of calculation ∧ of second formula
Pn420-rotatedTo level off to 1, the result of calculation of other formula can be less than ∧
Pn420-rotatedTherefore, the transmission mode that can tell the PN sequence of transmission end according to result of calculation is second kind of transmission mode.
In addition, can suppose that also variable PN sequence is that then first formula to the, five formulas become following form to moving to left a bit:
Wherein, the input data that r () expression receives, d, k be the express time index respectively, the input signal of r (d) expression receiver, the output signal of r (d-k) expression holder, and the relevant output valve that adds up of ∧ (d) expression oneself.
In addition, be convenient calculating and required time of shortening calculating, also first formula to the, five formulas can be rewritten into following form:
0≤N＜420
Wherein, the input data that r () expression receives, d, k be the express time index respectively, the input signal of r (d) expression receiver, the output signal of r (d-k) expression holder, and the relevant output valve that adds up of ∧ (d) expression oneself.
Then, after obtaining result of calculation,,, pick out the employed transmission mode of frame header again according to operation result as step S330.The decision of the transmission mode of PN sequence can have multiple selection mode in the frame header.In one embodiment, can according to one both definite sequence calculate five kinds in regular turn to received signal and postpone relevant values for example from first transmission mode to the, five transmission modes, surpass up to certain value and set set value, can obtain the transmission mode of PN sequence.For instance, please refer to Fig. 4, demonstration one is according to the flow chart 400 of the transmission mode determining method of the embodiment of the invention.Suppose earlier selecting first kind of transmission mode (step S410), and first kind of transmission mode carried out the accumulation calculating (as first formula) (step S420) of self-correlation, if the result of calculation that obtains surpasses set value, represent that first kind of transmission mode promptly is the employed transmission mode of present header (step S450).Otherwise, if the result of calculation that obtains surpasses set value (step S420 denys), represent that first kind of transmission mode is not the employed transmission mode of present header, therefore, just then select other kind transmission mode (promptly second kind to the 5th kind in wherein a kind of) (step S440), and the transmission mode of choosing (for example: second kind) is carried out the accumulation calculating (as second formula to the, five formulas) of self-correlation, surpassing set value up to wherein a kind of result of calculation, just is the employed transmission mode of being asked of present header.In addition, set value can suitably be set according to the parameter or the rule of thumb of transmission environment, makes the result of calculation of correct transmission mode can surpass this set value.For instance, in one embodiment, if operation result between one first a numerical value V1 and a second value V2, then can be made as set value half (V1+V2)/2 of the summation that approximates first numerical value and second value.Therefore, (surpass (V1+V2)/2) when surpassing this set value, represent that this transmission mode is the employed transmission mode of present header as if the result of calculation when calculating a certain transmission mode.In another embodiment, if operation result is no more than a maximum MAX, can decide according to environment at that time set value is made as to approximate 3/4 of this peaked half MAX/2 or MAX.Therefore, (surpass MAX/2) when surpassing this set value, represent that this transmission mode is the employed transmission mode of present header as if the result of calculation when calculating a certain transmission mode.
In another embodiment, can calculate five kinds in regular turn to received signal and postpone relevant value, shown in equation first formula to the five formulas, relatively five kinds postpone relevant value, find out maximum, and its corresponding PN sequence is the transmission mode of being asked.For instance, please refer to Fig. 5, show another flow chart 500 according to the transmission mode determining method of the embodiment of the invention.In this embodiment, five kinds of transmission modes will be calculated simultaneously, to produce five result of calculations (step S510) of corresponding five kinds of transmission modes, compare these result of calculations, maximizing (step S520) again.Therefore, have the pairing transmission mode of Computation of Maximal Waiting result and be the transmission mode of being asked (step S530).
In another embodiment, can calculate five kinds in regular turn to received signal and postpone relevant value, relatively five kinds of standard differences that postpone relevant value are found out the maximum standard deviation value, and its corresponding PN sequence is the transmission mode of being asked.In this embodiment, five kinds of transmission modes will be calculated simultaneously, to produce five result of calculations of corresponding five kinds of transmission modes, compare these result of calculations again, find the result of calculation with maximum standard deviation.Therefore, the pairing transmission mode of result of calculation with maximum standard deviation is the transmission mode of being asked.
Fig. 6 shows the schematic diagram according to the identifying frame header system 600 of one embodiment of the invention.Input signal r (d) is sent to storage element 610, in order to the input signal r (d-k) of k sampling point of continuous storage delay, then postpone the input signal r (d-k) of k sampling point and the conjugate complex number r* (d) of input signal r (d) and be resent in the correlation value calculation unit 620.Wherein, correlation value calculation unit 620 can also comprise conjugation plural number generation unit (not shown), receiving inputted signal r (d) and the input signal r (d-k) that is delayed k sampling point, and produce required conjugate complex number r* (d) or r* (d-k).Correlation value calculation unit 620 utilizes a sampling window, and its sampling window length is a set value N, comes the signal calculated relating value, the mathematical expression of its calculation mode shown in equation first formula to the five formulas.
Correlation value calculation unit 62 then is sent to operation result generation unit 630 with the correlated results of trying to achieve.Operation result generation unit 630 can also comprise the unit (not shown) that adds up, and adds up in order to will carry out correlation value calculation unit 620 resulting correlated results, producing required operation result, and operation result is delivered to identifying frame header unit 640.Identifying frame header unit 640 is judged the transmission mode of frame header, and is obtained the data of data segments whereby according to an operation result and the established rule calculated.Wherein, identifying frame header unit 640 can also comprise a comparator (not shown), in order to find out the result of calculation with maximum or maximum standard deviation.For instance; identifying frame header unit 640 can be according to Fig. 4 or flow process shown in Figure 5; judge that whether operation result surpasses a set value or find one that wherein has maximum or maximum standard deviation, and then obtain the transmission mode of the used frame header in the transmission end asked.
Above-mentioned explanation provides several different embodiment or uses distinct methods of the present invention.Specific device in the example and method are in order to help explaination main spirit of the present invention and purpose, to the invention is not restricted to this certainly.
Certainly; the present invention also can have other various embodiments; under the situation that does not deviate from spirit of the present invention and essence thereof; those of ordinary skill in the art work as can make various corresponding changes and modification according to the present invention, but these corresponding changes and distortion all should belong to the protection range of the appended claim of the present invention.
Claims (25)
1, a kind of identifying frame header method is applicable to a digital TV ground multi-media broadcasting system, it is characterized in that, comprises the following steps:
Receive a package, wherein this package comprises a plurality of frames, and each frame has a header and a data interval, and this header corresponds respectively to a particular sequence corresponding to one of a plurality of transmission modes and described a plurality of transmission mode;
This header of the particular frame that this header of one of described a plurality of frames is corresponding with carries out related operation, produces a plurality of operation results corresponding to described a plurality of transmission modes; And
According to described a plurality of operation results, pick out this used transmission mode of this header.
2, identifying frame header method according to claim 1 is characterized in that, this corresponding particular frame is positioned at before this of described a plurality of frames.
3, identifying frame header method according to claim 2 is characterized in that, one of this of the particular frame that this is corresponding and described a plurality of frames, two frame lengths of being separated by.
4, identifying frame header method according to claim 1 is characterized in that, each this header has a plurality of sampling points, and this generation also comprises corresponding to the step of a plurality of operation results of described a plurality of transmission modes:
One corresponding sampling point of this header of the particular frame that each sampling point of this this header of of described a plurality of frames is corresponding with this carries out related operation, to obtain a plurality of correlations; And
Described a plurality of correlations are added up, produce this operation result.
5, identifying frame header method according to claim 1 is characterized in that, the described a plurality of operation results of this foundation, and the step that picks out this used transmission mode of this header also comprises:
Find out and have peaked one in described a plurality of operation result; And
This transmission mode that determines this header has a pairing transmission mode of peaked operation result for what this found.
6, identifying frame header method according to claim 1 is characterized in that, the described a plurality of operation results of this foundation, and the step that picks out this used transmission mode of this header also comprises:
Find out one that has maximum standard deviation in described a plurality of operation result; And
Determine this transmission mode of this header to be this pairing transmission mode of the operation result with maximum standard deviation that finds.
7, identifying frame header method according to claim 1 is characterized in that, this particular sequence is a pseudo noise sequence.
8, identifying frame header method according to claim 1 is characterized in that, this header is corresponding to one of five kinds of transmission modes.
9, identifying frame header method according to claim 1 is characterized in that, this transmission mode is corresponding to one of three kinds of header length, and wherein three kinds of header length are respectively 420,595 and 945 characters.
10, identifying frame header method according to claim 9 is characterized in that, this particular sequence is the variable sequence of a fixed sequence program or this fixed sequence program.
11, a kind of identifying frame header system is applicable to a digital TV ground multi-media broadcasting system, it is characterized in that, comprising:
One storage element, in order to receive and to store input signal from a digital TV ground multi-media broadcasting system package, wherein this package comprises a plurality of frames, each frame has a header and a data interval, and this header corresponds respectively to a particular sequence corresponding to one of a plurality of transmission modes and these a plurality of transmission modes;
One correlation value calculation unit, this header of the particular frame that this header of one of these a plurality of frames is corresponding with carries out a related operation and obtains correlation;
One operation result generation unit receives the correlation of this correlation value calculation unit, produces a plurality of operation results corresponding to these a plurality of transmission modes; And
One identifying frame header unit according to these a plurality of operation results and an established rule, picks out this used transmission mode of this header.
12, identifying frame header according to claim 11 system is characterized in that, this correlation value calculation unit also comprises conjugation plural number generation unit, in order to produce the conjugate complex number of this received signal correspondence, to finish this related operation.
13, identifying frame header according to claim 11 system, it is characterized in that, this operation result generation unit also comprises the unit that adds up, in order to resulting this correlation in this correlation value calculation unit is added up, to produce these required a plurality of operation results.
14, identifying frame header according to claim 11 system is characterized in that this identifying frame header unit also comprises a comparator, in order to find out an operation result that has maximum or maximum standard deviation in these a plurality of operation results.
15, identifying frame header according to claim 14 system is characterized in that, this identifying frame header unit also find out according to this comparator this have peaked operation result, determine this transmission mode of this header.
16, identifying frame header according to claim 14 system is characterized in that, this identifying frame header unit also find out according to this comparator this have the operation result of maximum standard deviation, determine this transmission mode of this header.
17, identifying frame header according to claim 11 system is characterized in that, if this operation result of a transmission mode surpasses a set value, this identifying frame header unit determines that the transmission mode of this header is this transmission mode.
18, identifying frame header according to claim 11 system is characterized in that this header is corresponding to one of five kinds of transmission modes.
19, identifying frame header according to claim 11 system is characterized in that this transmission mode is corresponding to one of three kinds of header length, and wherein three kinds of header length are respectively 420,595 and 945 characters.
20, identifying frame header according to claim 19 system is characterized in that this particular sequence is the variable sequence of a fixed sequence program or this fixed sequence program.
21, a kind of identifying frame header method is applicable to a digital TV ground multi-media broadcasting system, it is characterized in that, comprises the following steps:
Receive a package, wherein this package comprises a plurality of frames, and each frame has a header and a data interval, and this header is corresponding to one of a plurality of transmission modes, and wherein these a plurality of transmission modes correspond respectively to a particular sequence; And
This header of the particular frame that this header of one of these a plurality of frames is corresponding with carries out related operation, and produces an operation result of one corresponding to these a plurality of transmission modes,
Wherein if this operation result of a transmission mode surpasses a set value, the transmission mode that determines this header is this transmission mode.
22, identifying frame header method according to claim 21 is characterized in that, also comprises:
If this operation result of this transmission mode does not surpass this set value, this header of the particular frame that this header of one of these a plurality of frames is corresponding with carries out related operation, and produce another a operation result corresponding to these a plurality of transmission modes, to pick out the transmission mode of this header.
23, identifying frame header method according to claim 21 is characterized in that, this operation result is between one first numerical value and a second value, and this set value equals half of summation of this first numerical value and this second value.
24, identifying frame header method according to claim 21 is characterized in that, this operation result is no more than a maximum, and this set value equal this peaked half.
25, identifying frame header method according to claim 21 is characterized in that, this transmission mode is corresponding to one of three kinds of header length, and three kinds of header length are respectively 420,595 and 945 character lengths.
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| CN102223224A (en) * | 2010-04-19 | 2011-10-19 | 联咏科技股份有限公司 | Frame synchronization device and method based on difference correlation in communication system |
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