CN101867446A - Transmit the method for receiving broadcast signal and transmit receiving broadcast signal equipment - Google Patents
Transmit the method for receiving broadcast signal and transmit receiving broadcast signal equipment Download PDFInfo
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Abstract
The present invention relates to transmit receiving broadcast signal and broadcast singal and transmit receiving equipment, according to the present invention, transmit the embodiment of the method for broadcast singal, the source and course that comprises a plurality of frames that are made of first data and second data field utilizes the special code randomization, above-mentioned randomized source and course chnnel coding generates data block, from the data block of above-mentioned generation, generate signal frame, and transmit the signal frame of above-mentioned generation.Here above-mentioned said randomization utilizes wherein a kind of method with the randomized method of predefined randomization period at least with comprising in the data method of randomization that has randomness in the above-mentioned second portion data field.Therefore, according to the present invention, improve the randomness (randomness) that transmits signal when having the randomized algorithm (randomization algorithm) that not only can keep relevant specification, the randomness that improves above-mentioned transmission signal improves the collection of letters performance of receiving terminal, and need not any optional equipment at receiving terminal, receive and also handle the effect that randomness transmits signal and improves the efficient of system.
Description
Technical field
The present invention relates to transmit broadcast singal and broadcasting signal receiving, more especially in order to improve the performance of broadcasting signal receiving receiving broadcast signal, transmit and receiving equipment thereby strengthen the broadcast singal transmission that sends signal randomness (randomness) and method of reseptance and broadcast singal.
Background technology
For China earthward the specification that proposes of wave number word television broadcasting heart standard case be called ground digital multimedia/television broadcasting (Terrestrial Digital Multimedia/Television Broadcasting; ), below be DMB-T).Can in DMB-T, being time-domain synchronous orthogonal, frequently multiplexing (time domainsynchronous orthogonal frequence divsion multiplexing (OFDM) is TDS-OFDM once, hereinafter referred to as TDS-OFDM) signal modulation skill and technique and single-carrier modulated technology come the modulation skill and technique of transmission signals selectively to be used.
The signal of the receiving terminal modulation back transmission of TDS-OFDM such as Cyclic Prefix OFDM (cyclicprefix OFDM is following to be CP-OFDM) method are on the signal that most subcarriers transmit, and the anti-Fu Li of separation leaf conversion (Inverse Discrete Fourier Transform is following to be IDFT) is suitable for (multi-carrier modulation).
On the contrary, the transmission signal of DMB-T, Load Signal on a carrier wave, utilization modulation skill and technique (single-carrier modulation) can be transmitted.Promptly, the transmission signal of DMB-T, the mutual multiplexing transmission of signal that signal that obtains by multi-carrier modulation and single-carrier modulated obtain. still, multiplexing transmission signal is as training signal, on protection interval (guard interval), not CP, but inserted man made noise signal (pseudonoise; Below be PN).
Mode same as described above, the signal overhead (overhead) in the time of can reducing the broadcast singal transmission.Improve channel and be suitable for efficient, improve the power of broadcasting signal receiving and the performance of channel estimation unit.
Yet according to the randomized algorithm of traditional DMB-T mode and relevant specification, the randomization reset cycle is short, in this cycle, can produce randomization zero and wrap in and draw that to go up equally distributed probability low, the problem that randomness (randomness) reduces.It is low also can to produce such transmission signal randomness, the problem that the receptivity of receiving terminal reduces.Moreover in the transmission end, the change according to the randomized algorithm of relevant specification can bring burden to receiving terminal. at receiving terminal.Descend in order to compensate the randomness that transmits signal, increase equipment needs expense, may bring the specification of equipment, the problem of whole efficiency such as size.
Summary of the invention
The problem that solves
The present invention is exactly in order to address the above problem, purpose of the present invention is intended to, keep relevant specification signal random algorithm (randomization algorithm), sending and receiving method and the broadcast singal transmission and the accepting device of the broadcast singal that can improve randomness (randomness) be provided.
Other purposes of the present invention are to strengthen transmitting the randomness of signal, thereby improve the performance of receiving the broadcast singal receiving terminal.
Another object of the present invention is the efficient of raising system, does not add any other equipment at receiving terminal that is:, and the transmission signal that the above-mentioned randomness of good reception is strong is also effectively handled this signal.
The means of dealing with problems
The present invention relates to transmission and the method for reseptance and the broadcast singal transmission receiving equipment of broadcast singal, according to the present invention, transmit the embodiment of the method for broadcast singal, the source and course that comprises a plurality of frames that are made of first data field and second data field utilizes the randomized stage of special code; Above-mentioned randomized source and course chnnel coding generates the stage of data block; In the data block of above-mentioned generation, generate the stage of Frame; And the transfer phase of the signal frame of above-mentioned generation, the above-mentioned randomization stage is with predefined randomization period randomization with comprise in the data method of randomization that has randomness in above-mentioned the 2nd data field and utilize a kind of mode at least.
At this moment, above-mentioned randomization portion, can utilize as predefined random period and to have two units more than the frame at least, calendar day frame (CDF:calendar day frame) unit somely in minute frame (minuteframe) unit and super frame (super frame) unit carries out randomization.
And, above-mentioned randomization portion is as above-mentioned data with randomness, at least in a randomization period, data in each the 2nd data field data same mutually or that do not repeat mutually also can comprise the data of passing through PRBS as above-mentioned data with randomness.
About an example of transmission broadcast singal, comprise that the source and course of a plurality of frames that the data field by the 1st data field and the 2nd constitutes utilizes the randomized randomization of special code portion according to the present invention; Above-mentioned randomization source and course chnnel coding forms the chnnel coding portion of data block; Generate the generating unit of signal frame by the data block of above-mentioned generation; And the transport unit of the above-mentioned generation signal frame of transmission; Above-mentioned randomization portion is with the randomized mode of the above-mentioned source and course of predefined randomization period with comprise in the data randomization meter mode that has randomness in above-mentioned the 2nd data field and utilize a kind of mode at least.
At this moment, above-mentioned randomization portion, can utilize as predefined randomization period and to have two units more than the frame at least, calendar day frame (CDF:calendar day frame) unit somely in minute frame (minute frame) unit and super frame (super frame) unit carries out randomization.
And, above-mentioned randomness portion is as above-mentioned data with randomness, at least in a randomization period, data in each the 2nd data field are all mutual same or be unduplicated data, also can comprise random data by PRBS as above-mentioned data with randomness.
One example of broadcast signal processing method comprises according to the present invention, receives the reception stage of using the randomized digital broadcast signal of special code; And the stage that the digital broadcast signal of above-mentioned reception is encoded. above-mentioned digital broadcasting letter comprises a plurality of frames that are made of the 1st data and the 2nd data field, randomization utilizes wherein a kind of mode with the randomized mode of predefined randomization period at least with comprising in above-mentioned in the data randomised way that has randomness in above-mentioned the 2nd data field, above-mentioned coding stage, the stage of recompile does not finish by the stage of above-mentioned the 2nd data field of identification and the 2nd data field of control identification in the digital broadcast signal of above-mentioned reception.
At this moment, above-mentioned predefined random period can be, has the above unit of two frames at least, and calendar day frame (CDF:calendar day frame) unit is some in minute frame (minute frame) unit and super frame (super frame) unit.
And, above-mentioned data with randomness, at least one at random during in, the data in each the 2nd data field are all mutual same or be unduplicated data, also can comprise the random data by PRBS.
In addition, above-mentioned digital broadcast signal comprises the frame head of the symbol that has at least one yard in 420,595 and 945 and has the information frame of the frame of 3780 symbols.Above-mentioned frame comprises the demodulating information of every signal frame needs, decoded information, and the sign map mode, LDPC code rate is inserted pattern information, the signal message that frame pattern information etc. are corresponding.Can change by the above-mentioned the 1st and the 2nd data field and realize
One example of broadcast signal processing method comprises according to the present invention, receives the acceptance division that uses the randomized digital broadcast signal of special code; The encoder that the digital broadcast signal of above-mentioned reception is encoded; And the control part of the above-mentioned encoder encodes action of control; Above-mentioned digital broadcasting letter comprises a plurality of frames that are made of the 1st data and the 2nd data field, randomization utilizes wherein a kind of mode with the randomized mode of predefined randomization period at least with comprising in above-mentioned in the data randomised way that has randomness in above-mentioned the 2nd data field, above-mentioned control part, the 2nd data field that the stage of above-mentioned the 2nd data field of identification and control are discerned in the digital broadcast signal of above-mentioned reception is the control part of recompile not.
At this moment, above-mentioned control part, decoding control to the above-mentioned digital broadcast signal that receives, the predefined random period of above-mentioned digital broadcast signal can be, has the above unit of two frames at least, calendar day frame (CDF:calendar day frame) unit, some in minute frame (minute frame) unit and super frame (super frame) unit.
And above-mentioned control part, to the decoding control of the digital broadcast signal of above reception, above-mentioned data with digital broadcast signal randomness are at least in a randomization period, data are same mutually or be unduplicated data in each the 2nd data field, also comprise the random data that passes through PRBS.
In addition, above-mentioned control part, the decoding control of the digital broadcast signal of above-mentioned reception, above-mentioned digital broadcast signal, comprise and have 420, with the frame head and the information frame that comprises the frame of 3780 symbols of the symbol that has a sign indicating number at least, above-mentioned frame comprises the demodulating information of every signal frame needs, decoded information in 595 and 945, the sign map mode, LDPC code rate is inserted pattern information, the signal message that frame pattern information etc. are corresponding.Can change by the above-mentioned the 1st and the 2nd data field and realize
Effect:
Transmit receiving equipment according to the present invention relates to transmission and receiving broadcast signal method and broadcast singal,
The first, can keep the random algorithm (randomnization algorithm) of relevant specification, improve the randomness (randomness) that transmits signal.
The second, improve the randomness of above-mentioned transmission signal, and improve the collection of letters performance that receives termination, and
The 3rd, be not with any optional equipment at receiving terminal, have the strong transmission signal of the randomness of reception, and improve the advantage of treatment effeciency.
Description of drawings
Fig. 1 is according to the present invention, and the drawing of the formation symbol of broadcast singal conveyer is described
Fig. 2 is related to the present invention to Fig. 4, for the generation of each sequence is described, illustrates that linear feedback shifts
The drawing of (liner feedback shift register:LFSR below is LFSR) of structure
Fig. 5 concerns the present invention, and the drawing of frequency device coding (scrambler coder) is described
Fig. 6 is the drawing of each cycle of signal frame randomized packet repeatedly of explanation
Fig. 7 is the interweave drawing of effect of explanation time domain
Fig. 8 is very according to example 1 of the present invention, and the drawing that improves randomized method is described
Fig. 9 is in order to realize example 2 of the present invention, the drawing of the formation of conveyer to be described
Figure 10 receives the strong transmission signal of randomness according to the present invention, and the drawing of the formation structure of the reception of handling
Explanation for main symbol
110: randomization portion 120: forward error correction portion 130: chnnel coding portion
140: system information output portion 150: multiplexing unit 160: frame handling part
170: frame head output portion 180: frame formation portion 190: filter house
200: transport unit
The particular content that carries out an invention
In view of the above, the drawing of the method for the transmission broadcast singal that reference adds according to the present invention and the action of equipment, concrete condition is as follows:
Method according to transmission of the present invention and receiving broadcast signal, and explanation to being provided with, below be example (terrestrial digitaltelevision broadcast) in this manual for convenience of description with the ground digital television broadcast, especially with China earthward in the television broadcasting of wave number word the transmission of signal and method of reseptance and equipment be that example describes.
The broadcast singal transfer equipment
Fig. 1 be according to the present invention for the example of Configuration Framework figure of broadcast singal transfer equipment.
Device one example according to broadcast singal transmission of the present invention, comprise: portion (110) (randomization block) at random, forward error correction portion (120) (forward error correction (FEC) block), chnnel coding portion (channel coding (constellation mapping and interleave) block) (130), system information output portion (system information block) (140), multiplexing unit (multiplexer) (150), frame data processing division (frame body data processing block) (160), frame head output portion (frame header block) (170), frame formation portion (frame groupingblock) (180), filter house (filtering (baseband post processing) block) (190) and transport unit (transmitting (orthogonal up-convert) block) (200).
For the detailed description of each frame section, as follows:
Portionization (110) at random: with source and course (source stream) randomization (randomization) of input.At this moment, randomisation process in the above-mentioned portion at random (110) can be introduced in appropriate section about method execution or specific description according to the present invention in detail according to described later, omits herein.Here the source and course that is input to above-mentioned portion at random (110) is, for example bit stream form (bit stream).
Forward error correction portion (120) is for the correction forward (FEC) of the transmission signal (transportsignal) that comprises randomized input source and course.Forward error correction here (FEC) in order to make the convenience of correcting the broadcast singal that transmits at receiving terminal, can fetch realization by the chain of sign indicating number (outer code) and ISN (inner code) outside the end of delivering letters.In addition, above-mentioned outer sign indicating number can use BCH (Bose-Chaudhuri-Hocquenghem), and ISN can use LDPC (Low DensityParity Check).At this moment, the concrete parameter (parameter) of forward error correction (FEC) for example, and is the same with table.1
Table 1
| Number | Code long (bit) | Message code | Corresponding codes efficient |
| ??Code?rate?1 | ?7488 | ??3008 | ??0.4 |
| ??Code?rate?2 | ?7488 | ??4512 | ??0.6 |
| ??Code?rate?3 | ?7488 | ??6016 | ??0.8 |
BCH (762,752) be with BCH (1023,1013) shorten to form, add 0 and form 1013 bits and this is encoded on the preceding 261 bit bases of 752 Bit data scramblers (bit data scrambling code), 1023 bits (information bit information bit) are preceding.Afterwards, the basis of 261 bit informations before again 0,762 bit information that gets on forms the BCH code word.The mathematical expression 1 of the multinomial (polynomial) that above-mentioned BCH code word generates is as follows:
G
BCH(x)＝1+x
3+x
10
In above-mentioned each code check (code rate), forward error correction (FEC) for example can be used same BCH code.
Then, the structure of the generator matrix of LDPC sign indicating number (generation matrix) Gqc is for example, identical with following mathematical expression 2
Mathematical expression 2
Wherein, ' I ' is bxb step unit matrix (step unit matrix), ' O ' is bxb step null matrix (step zero matrix), G (i, j) be bxb circular matrix (circulation matrix) ' i greater than 0 less than k-1, ' j ' greater than 0 less than c-1.
When LDPC coding (not shown) imported in order in the BCH code word, anteposition (bit) is first element (first element) of information sequence vector (information sequence vector), the codeword information position (bit) of above-mentioned LDPC encoder output is positioned at the position of check digit (check bit) front in the back, the LDPC sign indicating number produce circular matrix G (i, j).More than forward error correction (FEC) structure of three different code rates (coderate), illustrate into down:
A), code check is 0.4 FEC (7488,3008) sign indicating number:
5 check digits of 4 BCH (762,752) sign indicating number and LDPC (7493,3408) yard fronts at first.The matrix Gqc of LDPC (7493,3048) sign indicating number has the matrix form that shows as in (3), and matrix parameter is k=24, c=35, b=127.
B), code check is 0.6 FEC (7488,4512) sign indicating number:
At first 6 BCH (762,752) sign indicating number and LDPC (7493,4572) sign indicating number link to each other, then 5 check digits of deletion (7493,4572) front.The matrix Gqc of LDPC (7493,4752) sign indicating number has the matrix form that shows as in (3), and matrix parameter is k=36, c=23, b=127.
C), code check is 0.8 FEC (7488,6016) sign indicating number:
At first 8 BCH (762,752) sign indicating number and LDPC (7493,6096) sign indicating number link to each other, and delete 5 check digits of LDPC (7403,6096) code front then.The generator matrix Gqc of LDPC (7493,6096) sign indicating number has in (3) formula and shows rectangular in form, among parameter be k=48, c=11, b=127.
Chnnel coding portion (130) carries out chnnel coding (channelcoding) to the transmission signal of above-mentioned forward error correction, and chnnel coding can be passed through sign map (symbol mapping) here, and interweave (interleaving) waits and realize.The bit stream (bitstream) of above-mentioned sign map process forward error correction is to the mapping of trooping (constellation mapping) of symbols streams (symbol stream).That is: nQAM (quadrature amplitude modulation uniformly, Quadrature Amplitude Modulation), (n constellation points (constellation point) quantity here) means the transformation of symbols streams (symbol stream), in addition, comprises most sign map relations on relevant specification.Such sign map relation can comprise 64QAM, 32QAM, 16QAM, 4QAM and 4QAM-NR.The sign map of above-mentioned majority imposes all standardizations (power normalization) of electric power, and the electric power that makes a plurality of sign map much at one.For example per 6 bytes of 64QAM modulation reflection incoming bit stream are corresponding with a constellation symbols (constellation symbol).Per 5 bytes of 32QAM modulation reflection incoming bit stream are corresponding with a cluster code, per 4 bytes of 16QAM modulation reflection incoming bit stream are corresponding with a cluster code, and per 2 bytes of 4QAM modulation reflection incoming bit stream are corresponding with a cluster code. and 4QAM-NR is meant in addition increases before above-mentioned 4QAM sign map or suitable NR orthogonal coding mapping (Nordstrom Robinson (NR) near orthogonal encodingmapping).Above-mentioned chnnel coding portion (130) is at the symbols streams that DO symbol mapping back the forms formation symbolic unit that interweaves.Because interweaving of symbolic unit can carry out in the master data piece (data block) of a plurality of symbolic frames (symbol frame) for time domain interweaving encoding (time domaininterleaving encoding) here.For example, data-signal (that is, the constellation symbols of numeric data code (data code) interweaving between) the master data piece, can utilize the convolutional interleave coding (convolve interleave encoding) based on constellation symbols.
System information output portion (140) output comprises the system information about the transmission signal of the information of structure that transmits signal or chnnel coding.Here system information (system information) for example, can comprise about transmitting the interior bit rate (inner code rate) of signal, the information of the modulation type (modulationtype) and the model that interweaves (interleaving mode) etc.
Multiplexing unit (150) is that the system information of signal that chnnel coding is obtained and output is multiplexing.
Frame handling part (160) is handled the frame signal of the broadcast data that transmits input signal multiplexing in the multiplexing unit (150).Here, frame handling part (160) can utilize according to two kinds of modulation systems of relevant specification definition and carry out signal in the frame of separate processes input transfer signal.A kind of is single-carrier modulated mode (single carrier (SC) modulation scheme), and another kind is multi-carrier modulation (multi carrier (MC) modulation scheme).ATSC (8-VSB) mode of the single-carrier modulated mode (SCmodulation scheme) and the U.S. is similar, based on higher bit (bit) speed and superior performance, can be used for the fixedly TV (HDTV HighDefintion Television) of HDTV (High-Definition Television).Multi-carrier modulation (MC modulation scheme) is according to the present invention, and multiplex mode (Cyclic Prefix (CP)-OFDM (CP-OFDM)) is similar frequently to prefix orthogonal.Here; transmission data according to above-mentioned multi-carrier modulation; utilize contrary discrete Fourier transform (DFT); protection at interval; not a CP but PN (pseudo noise) sequence (Pseudo-random Noise (PN) Sequence (PN)) be used for training sequence (training sequence) that therefore, above-mentioned multi-carrier modulation (MC modulation scheme) not only can reduce the transmission expense; improve channel performance, also can improve the motivation processing of the end of collecting mail and the performance of channel estimation unit.
Frame head output portion (170), output is as the training signal (training sequence) that transmits signal, the header signal of use.Among the present invention, to use the PN sequence to be example as above-mentioned training signal.Frame head output portion (170) generates the PN sequence by certain rule
Frame formation portion (180) exports frame handling part (160) and frame head output portion (170) output is multiplexing and form data frame structure (date frame structure).Here, the structure example of Frame is as forming the structure of 4 layers (layer).In addition, the elementary cell of the structure of above-mentioned Frame is signal frame (signal frame).Signal frame is made of frame head (frame header) and frame (frame body).Super frame (super frame) is defined as one group of signal frame.Minute (minute frame) frame definition is one group of super frame.In addition, top (the top layer) of above-mentioned Frame is CDF (Calendar DayFrame).Here, signal frame (signal frame) is as the base unit of system-frame structure, and by a signal frame, the time-domain signal of above-mentioned frame head and frame part constitutes.Difference according to the formation of above-mentioned frame head can form different structures.In addition, the signal baseband signal ratio of frame head and frame (baseband symbol rate) for example can
Be that identical value is 7.56MHz.
Frame head is made of the PN sequence, and 3 kinds of patterns are arranged.Relevant with the present invention generating structure for each sequence with Fig. 4 of Fig. 2 is the diagram of example with linear feedback shift register sequential structure figure (linear feedbackregister (LFSR) is LFSR down).It below is more specific description with reference to figure 2 and Fig. 4.
At first, the PN sequence that frame head mode (Frame header mode) adopts is defined as the 8 step m sequences (8step m seqence (8 dried time)) of clicking expansion (Cyclic Extension).Can realize with a LFSR, with ' 0 '+1 value (value), ' 1 '-1 value (value), binary character mapping conversion.
Length (Length) is that the header signal (frame header signal, PN 420) of 420 symbols is made of a signal heads (pre-amble) and PN255 sequence and a signal tail (post-amble).Above-mentioned signal heads and signal tail are defined as the expansion of clicking of PN255 sequence, and wherein the length of signal heads is 82 symbols, 83 symbols of the length tail of signal tail.Initial (linitial) condition of LFSR determines to generate the PN sequence phase.255 signal frames are arranged in the super frame, and in every super frame, the frame head of each signal frame adopts different position phase PN signal mutually, forms signal frame link (frame tag).
The generator polynomial of the LFSR of formation sequence PN255, for example can represent with following mathematical expression 3:
Mathematical expression 3
G(x)＝1+x+x
5+x
6+x
8
PN 420 sequences can generate the LFSR that shows among Fig. 2.During with reference to figure 2, initial condition based on LFSR, can generate 255 mutual different position phase PN420 sequences, serial number position from 0 to 254. is selected 225 position phase PN420 sequences wherein in the present invention, order from 0 to 224. is selected wherein 225 PN420 sequences in the present invention, under the sequence number during since 0 to 224. each super frame LFSR (reset) sequence number of rolling back and rationalizing of resetting be 0 initial condition.
The average electric power of header signal is 2 times of frame signal averaging electric power.In addition, can not realize the phase change of PN sequence under the situation that does not require the display frame serial number, the use serial number is 0 initial phase.
Then, frame head mode 2 (Frame header mode 2) adopts the longest PN sequence of 10 steps, and the length of header signal is 595 symbols, is that 1023 m sequence (m sequence) front has 595 symbols in length just.The PN sequence that greatly enhances most generates the shift register group (shift register group) of 10 bits (bit).The concrete multinomial that generates is identical with mathematical expression 4:
Mathematical expression 4
G
1023(x)＝1+x
3+x
10
The initial phase of the shift register group of 10 bits (bit) is 0000000001, and (reset) all resets when each signal begins.
The structure chart that generates the PN sequence that greatly enhances most is with reference to figure 3, and in reference to figure 3,595 sign indicating numbers before the PN sequence are with ' 0 '+1 value, and ' 1 '-1 is worth, and binary law carries out the sign map conversion.In this case, a super frame comprises 216 information frames altogether, and in each super frame, the frame head of each information frame can adopt same PN sequence.The average electric power of frame head is identical with the average electric power of frame signal.
Last frame head mode 3 adopts the PN sequence of (Frame header mode 3), is defined as the 9 step m sequences of clicking expansion.Can realize by a LFSR, with ' 0 '+1 value, ' 1 '-1 value, binary character mapping conversion.
Length is the header signal (PN 945) of 945 symbols, and by an information header, a PN511 sequence and an information tail constitute.Above-mentioned information header and information tail are defined as the expansion of clicking of PN511 sequence, and the length of above-mentioned information header and information tail is 217 symbols.The initial condition of LFSR is determined the phase of the PN sequence of generation.A super frame one has 200 signal frames, and the frame head of each signal frame adopts the mutually mutually different PN signal in position as the signal frame mark in each super frame.
For example figure below mathematical expression 5 definition equally of the multinomial of the LFSR of formation sequence PN511.
Mathematical expression 5
G
511(x)＝1+x
2+x
7+x
8+x
9
PN 945 sequences can generate the LFSR of Fig. 4.During with reference to figure 4,, can generate 511 mutually mutually different PN945 sequences, serial number from 0 to 510 based on the initial condition of LFSR.Select 200 PN945 sequences wherein in the present invention, serial number is 0 to 199. each super frame when beginning, and the reset sequence number of rolling back and rationalizing of LFSR is 0 initial bit phase.In addition, the average electric power of header signal is 2 times of frame signal averaging electric power.And under the situation that does not require the display frame serial number, can not realize the phase change of PN sequence, the use serial number is 0 PN initial bit phase.
As above-mentioned said, header signal has 3 kinds of patterns, and in this manual, header signal has adopted the same 4QAM modulation of I and Q.In addition, frame comprises 36 notation information and 3744 symbol datas totally 3780 symbols.The duration of super frame is defined as 125ms, and 8 super frame are 1 second.Therefore, time system (for example: GPS) just made things convenient for to the time time.During the duration of minute frame (minute frame) 1 minute, comprise 480 super frame.CDF carries out repetition with the cycle of a nature, constitutes during by 1440, and the time is 24 hours.
As mentioned above, the elementary cell of Frame framework is a signal frame.Signal frame is made of frame head and frame two parts, in order to be applicable to different operating modes, is defined as and 3 kinds of corresponding signal frame frameworks of action frame head mode.Therefore, along with the difference of above-mentioned 3 kinds of action action frame frame heads, the signal frame number of the super frame of formation is also different.
Filter house (190) is that filtering frames formation portion (180) produces signal bandwidth (bandwidth), promptly (for example: the bandwidth of 8MHz) forms output signal by baseband postprocessing (baseband post-processing).For example above-mentioned baseband postprocessing (baseband post-processing) adopts SRRC (Square Root Raised Cosine) filtering that base band is carried out the pulse correction, can prevent intersymbol interference.At this moment, the rolloff-factor factor of above-mentioned SRRC filtering (roll off factor: α) be 0.05.
And, transport unit (200) is the signal of filtering portion (190) output to be carried out quadrature up-conversion handle (orthogonal up conversion), the radiofrequency signal of the RF (RadioFrequency) of formation cycle wave number fc (centre frequency), transmit frequency range, for example, can utilize the RF frequency range of the cycle wave number frequency band range of UHF (hyperfrequency) VHF (very high frequency(VHF) radio-frequency range) to transmit signal.
Randomization (Randomization)
Transmit between data and exist correlation (correlation), this correlation can influence the transmission signal, produces unwanted signal.Therefore, the correlation of eliminating between sort signal just is starved of.One of method of erasure signal intersexuality correlation is exactly randomization (randomization).The randomization purpose is exactly the transmission that prevents unwanted signal, and therefore, the formation randomization just can be eliminated the correlation between data, and prevents the transmission of unwanted signal.Improve the performance of accepting of receiver. promptly eliminate the correlation that transmits between data by randomization, the electric power frequency spectrum graphics (powerspectrum) of the transmission signal of receiver also can obtain prediction substantially, timing recovery circuit shape (timingrecovery circuit) in the receiver, transmit data in automatic gain control circuit (automatic gain control circuit) and other adaptive circuits and relatively effectively handle, to improve the receiver overall performance.In addition, such randomization is for example also satisfied standard in FCC (Federal Communications Commission) (FCC:federal communicationscommission) and electromagnetic compatibility (EMC:electromagnetic compatibility) certification authority (certification instiution).
Below be for the additional reference diagram of randomised way.
The drawing that Fig. 5 pours into for an example of scrambler program coding related to the present invention (scrambler coder)
As mentioned above, affirmation is necessary in the randomness (randomness) of the transmission data of transmission end.Below be to turn at random with the explanation as an example of scramble sign indicating number (scrambling code) mode, here to use pseudo-random binary to be example (pseudo-random binary sequence:PRBS) with scrambler in this specification according to relevant specification transmitting data (stream data).
Among Fig. 5, import as an example with the formation of disturbing symbolic code (scramling code) related to the present invention.Transmission/the receiving terminal of broadcast singal uses pseudo-random binary sequence (PRBS) because of interference signal, and above-mentioned here sequence (PRBS) can generate LFSR.
The multinomial of LFSR such as mathematical expression 6, initial condition may be defined as 100101010000000.
Mathematical expression 6
G(x)＝1+x
14+x
15
Type bit stream (bit stream) and the 2nd mould of PN sequence (PN sequence pseudo noise code) affix (modulo two addition) back according to input generate data scramblers (datascreambling code).
Randomization reset cycle (Randomization reset period)
The linear feedback shift register (LFSR) of relevant specification scrambler coding (scrambling coder) has been expressed, during each signal frame (frame) beginning, and the initial condition of resetting back (initialphase).Be each frame, the linear feedback shift register cycle of all carrying out resets.An above-mentioned here frame, 3744 symbols (symbol) for example, above-mentioned symbol mean the data cell that the mapping of trooping (constellation mapping) by QAM pattern class (mode) forms.But the data of process forward error correction during the data before the above-mentioned mapping of trooping, promptly along with different code checks (code rate), the bitstream data of each frame (stream data bit) number is also different for example as table 2, and table 2 has shown random period replacement (randomization reset period)
Table 2
Randomness (randomness)
Fig. 6 is for the drawing of the randomized zero bag importing that each signal frame cycle repeats is described.
As mentioned above, be that unit reset to realize randomization (randomization) with a signal frame among the present invention.Mode according to invention, in order to illustrate as follows: suppose having about 32Mbit/sec (here according to randomization explanation randomness (randomness), 64QAM, code rate (code rate))=0.8. signal frame length (singal fream length)=4200 symbols) system's (with reference to table 3 described later) of loading capacity (payload) in to propagate stream (ransport stream:TS) data transfer rate be the situation of 4Mbit/sec.Here, in getting rid of 32Mbit/sec, insert zero bag during the 28Mbit/sec of the TS data transfer rate of 4Mbit/sec.Above-mentioned zero bag by Head Section (header area) and data field (data area) (for example: 184 bytes) formation.Head Section (header) is as sign (flag) identification of packet, and promptly whether bag is zero bag, to the not restriction of above-mentioned data field.In addition, above-mentioned data field for example inserts all ' 1 ' or ' 0 '.
As mentioned above, if insert the situation of zero bag, account for the TS packet (Fig. 6 draws dash area) of overall signal frame 1/8, though each frame all carries out randomization, in above-mentioned complete frames, get rid of zero bag (A of Fig. 6, B of TS data redundancy part (Global Information frame 7/8), C) turn to uniform data at random, each Frame is (with reference to Fig. 6) repeatedly.If occupy zero bag of overall signal frame 7/8 here, (constellation point) is evenly distributed not according to 64 constellation points, but all gathers the situation on particular point, each information frame will strengthen at the probability that specified point distributes.This is the phenomenon that the degree randomness that is evenly distributed on 64 constellation points will reduce.Such phenomenon is along with TS data transfer rate (TS data rate) the relative system data loading capacity (payload) that transmits signal is little (promptly, along with increasing of zero bag), increasing (promptly of the constellation points that should be evenly distributed, high-order QAM pattern (highorder QAM mode)), the probability of generation just becomes big.The data transfer rate (payload data rate) that table 3 has shown system's load-carrying (Mbit/s).
Table 3
Time domain interweave (Time domain interleave)
Fig. 7 is the figure that inserts in order to illustrate time domain to interweave
The purpose of time domain interweaving encoding (Time domain interleave encoding) is to interweave at a plurality of signal frame internal symbols, makes when interweaving burst error (burst error) to take place to become obvious.For no other reason than that time domain interweaves with the symbol is that unit interweaves particular cluster point distribution probability is not exerted an influence.Words with reference to figure 6 can be found, though the position change of symbol because of interweaving of symbolic unit arranged, is not all changes of symbol, therefore the distribution to constellation points does not influence.
If is-symbol interweaving encoding (symbol interleave encoding) not as mentioned above, but carry out under the situation of Bit Interleave coding, because whole change (the bit interleave encoding) of value of symbol, being fixed in the zero bag on the specified point in the frame will change with the position of value of symbol in a plurality of frames that changes, and forms randomness.
As mentioned above, relevant specification randomization (2 times) reset cycle (randomization reset period) is for belonging to short by comparison in a frame (about 600us) and other broadcasting specifications.In other words, be exactly that the probability that whole constellation points homogeneous distributes in a randomization reset cycle is relatively low.If it is short with respect to system's load-carrying (payload date rate) data transfer rate to transmit signal TS data transfer rate, the proportion that inserts zero bag of AD HOC becomes big, and zero bag of each frame repeats.If when the randomization of a frame zero bag (randomized null packet) bag did not have homogeneous to be distributed on the whole accumulation point, particular aggregation point concentrated the possibility that transmits will become big so.This is along with the constellation points that should homogeneous distributes is a plurality of high-order QAMs (high order QAM mode) pattern and become big.In addition, because the change of Data Position, time-interleaved (the time interlever) that can improve randomness do not exert an influence to the distribution of constellation points with the symbolic unit action, so random distribution can not change yet.
The result carries out randomization according to the randomized algorithm that defines and hands over to deal with problems with symbolic unit and be difficult in order to improve randomness in relevant specification.Therefore, below in order to solve problem as mentioned above, by following embodiment, prevent that randomness is low, improve the receiving terminal performance.
The 1st embodiment
Fig. 8 is the figure that imports in order to improve the method for randomness according to the present invention the 1st embodiment.
During with reference to Fig. 8,, be about changing and expand the example of (hereinafter referred to as expansion) the randomization weight same period (randomization reset period) method according to example 1.
Because relevant with the randomization reset cycle, each information frame has all carried out reset cycle at random, and randomization is low, may exert an influence to receptivity.
So, propose to adopt the scheme of expanding randomization period in the present invention.
Be to the example more detailed description below according to the present invention
Fig. 8 (a) randomization reset cycle is the situation of 1 signal frame, and Fig. 8 (b) is in order to illustrate according to the present invention, randomization reset cycle condition of enlarged (2 signal frames) and the drawing that imports.Here, with reference to Fig. 8 (a) and Fig. 8 (b), each information frame is represented the TS data with the part of drawing shade,, rest parts is represented zero bag.In addition, the A of above-mentioned zero packet portion, B, C, D, E, F represents constellation points, so, for convenience of description, be that 7/8 zero situation of wrapping is an example among Fig. 8 with a frame.8 (a) randomization period is 1 signal frame, i.e. 3276 situations that symbols are zero bags in totally 3744 symbols, and 8 (b) randomization period is 2 signal frames, i.e. the situation of zero bag during the individual signal of 6552 (3276*2) in the individual symbol of 7488 (3744*2).
With reference to 8 (a) and 8 (b), 3276 symbols in zero bag of Fig. 8 (a) are evenly distributed on 64 constellation points, compare, and 6552 symbols in Fig. 8 (b) zero are evenly distributed on 64 constellation points, and to open rate higher.For example, among Fig. 8 (a), randomization same period of resetting is the situation of an information frame, randomization is reset and all is clustered in zero bag A the same period, B, on 3 constellation points of C, Fig. 8 (b) randomization same period is the situation of 2 frames, randomized zero bag is compared with 6 constellation points (A, B, C, D, E, distribution F) is variation more.
As a result, frame is reset the same period, forms the bigger cycle compared with 1 frame unit, more may form randomization.Just and the unconfined expanded phase ratio of frame reset cycle,, determine the efficient of randomized degree and system, definition that can appropriateness by the frame unit of expansion according to the power that transmits acknowledge(ment) signal.For example can be set at super frame unit, minute frame (minute frame) unit and, CDF (calendar day frame calendar day frame) unit.
The 2nd embodiment
According to the present invention, as improving randomized method the 2nd embodiment, the data that the data consular district of zero bag contains are not specific data, and are to use the data with randomness.Here so-called random data means, for example, same or per zero bag of not repeating mutually is different data mutually.In addition, the above-mentioned data that have randomness, data same or that do not repeat mutually in a frame period are benchmark with one zero bag in an above-mentioned randomization period at least, and are same with zero adjacent bag or do not repeat mutually.
Fig. 9 be according to the present invention in order to realize the 2nd embodiment, and the inscape of explanation conveyer and the drawing quoted.Here, Fig. 9 is according to the present invention, and at conveyer, the figure of no use of the reception purpose inscape behind the randomization unit shows, but same with the formation of above-mentioned Fig. 1, the also former explanation of using Fig. 1 of the explanation of the randomness of each inscape.
Randomized zero wrap in each randomization when resetting the same period repeatedly, taking the data particular data that the data field of stating randomized zero bag comprises here is example, like ' 1 ' and ' o ', same data being included in repeatedly according in the data field.General TS data cell district, along with the difference of randomization reset cycle, each frame of corresponding data integral body is also different.Because of having randomness, so do not produce the problem of randomness.The problem of final randomness mainly results from zero bag.In order to address this problem, have a lot of methods, but for convenience of description, be held in and utilize each randomization reset cycle among the present invention repeatedly, be data in the data field of randomization zero bag and TS data class seemingly, the method that makes it to have randomness is the example explanation.
Basic conception in the example 2 makes zero to wrap the same randomness that has with the TS packet as mentioned above.The Head Section that wraps by the formation zero of relevant specification there is certain regulation, but the data field is not had specific regulation.In order to satisfy the condition of above standard, prevent that randomness is low, the same or not repetition mutually of the data that comprise in the above-mentioned data field comprises the random data with randomness, determines the randomness that it is similar or same with the TS data.
In the present invention,, be included in zero data of wrapping in the data field, use random data to be example, promptly transmitting zero wrap multiplexing between the stream, constitute a source and course in order to form randomization at transmitting terminal by PRBS for the convenience that illustrates.At this moment, zero bag data field is by the randomization data of process PRBS and the formation of circling round.Therefore, among Fig. 1, the source and course of using the input of randomization unit is by zero bag and process PRBS randomization data, the bit stream form data of the multiplexing formation of the data of circling round and transmission block.Just the present invention not only is defined in above-mentioned example.Also found the data in the above-mentioned data field in advance, formed and use the situation of the random data that has randomness according to other mode, the fact that is included within the interest field of the present invention is also found in advance.
The 2nd embodiment according to the present invention as the data field of number zero, uses random data, not only can improve the performance of randomness, and the processing procedure to tradition zero bag of receiver is handled with same mode, also can determine the interchangeability with conventional receiver.Because, in the processing of receiver to zero bag, judge according to corresponding bag from basically, if corresponding bag is zero bag, just ignore, do not decode.Therefore, the data in the zero bag data field have the random data of randomness even replaced tradition with other, and the action of receiver can not change yet.That is, transmit the PRBS generator and, only increase and constitute the code that circles round and just can from the circle round code that circles round of (convolution) zero bag of the random data that generator produces.Receiving terminal also can be handled the strong transmission signal of randomness even without the appliance arrangement of any interpolation.
The 3rd embodiment
The 3rd embodiment of the present invention as be above-mentioned the 1st embodiment and the 2nd embodiment in conjunction with the embodiments.Change with the embodiment 1 the same randomization period that makes of statement, with the embodiment 2 the same embodiment that use of the data of zero bag in randomized each frame in the randomization period of stating with randomization data.
According to the situation of above-described each embodiment, as what state, the randomness that transmits signal is strengthened, and does not add any attachment device on receiving terminal, also can receive and handle the transmission signal that randomness is strengthened.
Receiving terminal
Figure 10 has been according to the invention to the drawing of the structural framing importing that the receiving terminal that receives and handle the strong transmission signal of randomization is described.Each framework of receiver is carried out and identical action down, with last identical, is received in the Chinese surface wave DTV broadcast singal with feature that receiving terminal is handled.
With reference to Figure 10, radio receiver comprises: tuning (tuner) (701), obtain control (auto again controller:AGC) portion (702) automatically, and AD changes (analog/digital converter; ADC) (703), Base-Band Processing (base band processing block) portion (704), (resampler) portion (705) resamples, monitoring and electricity be management department (SRRC:Square Root Raised Cosine) (706) frequently, carrier wave recovery portion (carrier recovery block) (707), time recovery portion (timingrecovery block) (708), data processing division (data processing block) (709), PN correlator (PN correlator) (710), channel estimator (channel estimator) (711), fourier transform portion (FFT:Fast Fourier Transform block) (712), channel balancing portion (channelequalizaion block) (713), time map portion (time deinterleaver) (714), storage part (715), symbol decoding portion (symbol demapper) (716), LDPC decode (LDPC decoder) (717), BCH decode (BCH decoder) (718), descrambler (descrambler) (719), and control part (720).A/V decode (721)
With reference to following additional Figure 10 to being described as follows that each framework that constitutes receiving terminal carries out:
Tuning (701) are transformed into baseband (baseband) to the RF band signal (450Mhz-860Mhz) that transmits to channel tuner by tuning channel.Automatically obtain control part (AGC) (702) and carry out power specificationization (power normalization) for the fixing big signal of approving A/D converter (703).AD conversion (ADC) (703) are that the similarity signal of input is converted to digital signal.The offset frequency that causes because of digital signal change is removed by Base-Band Processing portion (704).The portion (705) that resamples is a crystal frequency deviation of removing signal after the frequency deviation.Monitoring makes it to be recovered to the RC signal with electricity frequency management department (706) by the SRRS identical with transport unit.
Carrier wave recovery portion (707) is a frequency deviation (frequency offest) of inferring (estimating) compensation (compensate) input signal.Time recovery portion (708) is cancel out each other (the timing offset) of supposition and compensated crystal (crystal) time.Data processing division (709) is to eliminate ACI (adjacentchannel interference) and CCI (co-channel interference).PN correlator (710) is a coefficient correlation (correlation coefficient) of finding out frame head (frame header) and PN.Channel estimator (711) is the number of ways of inferring wireless channel (wireless channel).Fourier transform portion (712) is for equilibrium, and data and estimated channel are converted to (FFT) frequency zones (frequencedomain).
The contrary channel (de-filtering) of inferring that filters of channel balancing portion (713) is found out data.The decoding (interleave encoding) of time map portion (714) interweaving encoding signal.Decoded signal (decoding) in the interim temporary transient storage time mapping portion (714) of storage part (715).Symbol decoding portion (716) becomes the LDPC symbol to symbol mapping (mapping symbol) decoding (demapping) that transmits by the QAM pattern class.LDPC decoder (717) becomes the BCH code word to the LDPC decode codewords according to the code check (coderate) of LDPC, and BCH decoding (718) is decoded into a yard bit stream (scrambling coded bit stream) to the BCH code word.Descrambler (719) makes it to become data flow to sign bit stream (scrambling coded bit stream) descrambling (descrambling) of randomization (randomization).With A/V decoding (721) is to receive the data flow of descrambling and carry out decoding in (719).
Here according to invention, randomized zero wraps, and no matter whether corresponding bag be zero bag, also can be implemented in the demodulation of receiving terminal.That is, randomized zero bag that comprises in the data message of reception is carried out channel balancing (channel equalization) with other data, and signal is drawn (demapping), LDPC decoding, BCH decoding and descrambling.Afterwards, carry out randomization zero bag in the digital signal till the descrambler, whether identification is corresponding zero bag (null packet) in control part (for example system decodes) (720), and above-mentioned randomization zero bag is no longer decoded.Therefore, above in the example of the present invention narrated, even expansion zero bag randomization reset cycle or interim randomization data is not changed in zero bag data field does not add any optional equipment on receiving terminal, also can realize.
Roughly summarize tuning (701) receiving digital signals.The digital signal here can have signal frame as mentioned above.Above-mentioned signal frame generally is divided into frame head (frame header) and frame (frame body).As above-mentioned statement, frame head has a kind of in 3 those symbols at least.Above-mentionedly can have first long 420 symbols, the 2 595 symbol, length is 945 symbol at last.From the transmission end, the decoded information (demodulationinformation) that each signal frame (signal frame) needs, sign map (symbol mapping method), insert pattern information (interleavemode information), LDPC decoding rate (code rate), frame information (frame bodyinformation mode) is sent to frame with their corresponding information frame (signal frame) information.Signal frame transmission end again becomes packet (data packet) and zero bag (null packet).Zero wraps in the transmission end begins to have randomness from the PRBS processor.In receiver, comprise the decoding processing of contrary randomization, combine digital signal processing under the LDPC decoding.
Therefore, according to the present invention.The tradition randomization is calculated without variation and is kept the exchange row, prevents that the randomization of the information that transmits is low, improves receptivity.Receiving terminal is according to the present invention, even do not add any equipment, also can receive the strong broadcast singal of randomness and handles.
Claims (14)
1. the source and course that comprises a plurality of frames that are made of data first and second data fields utilizes the randomized stage of special code, comprising:
Above-mentioned randomized source and course chnnel coding generates the stage of data block;
The data block of above-mentioned generation generates the stage of signal frame; And
The transfer phase of the signal frame of above-mentioned generation,
The above-mentioned randomization stage is, with the randomized method of predefined randomization period with comprise the method for utilizing a kind of method to transmit broadcast singal in the data method of randomization that has randomness in above-mentioned the 2nd data field at least.
2. randomization according to claim 1,
Above-mentioned predefined randomization period,
At least 2 units that frame is above, calendar day frame CDF, minute frame, any one in the super frame transmits the method for broadcast singal.
3. according to asking profit to require 1 and 2 described randomizations,
The above-mentioned data that have randomness,
Data at least one random period in each the 2nd data field are mutual same or be repeating data not,
The transfer approach that comprises the broadcast singal of the randomization data of passing through PRSB.
4. the source and course that comprises a plurality of frames that are made of the 1st data and the 2nd data field utilizes the randomized randomization of special code portion, comprising:
Above-mentioned randomized source and course chnnel coding generates the chnnel coding portion of data block;
From the data block of above-mentioned generation, generate the signal frame generating unit of signal frame; And
Transmit the transport unit of the signal frame of above-mentioned generation;
Above-mentioned randomization portion is, carries out the randomized method of source and course and comprises the broadcast singal transfer equipment of using a kind of mode in the randomised way of the data that have randomness in above-mentioned the 2nd data field at least with predefined randomization period.
5. randomization according to claim 4 portion,
Above-mentioned randomization portion,
According to the above unit of at least 2 frames of randomization period of anticipation definition, calendar frame CDF, minute frame promptly uses wherein a kind of randomized broadcast singal transfer equipment that carries out in the super frame.
6. according to claim 4 and 5 described randomization portions,
Above-mentioned predefined randomness portion,
With above-mentioned data with randomness at least in a randomization period in each second data field data same mutually or utilize and do not repeat randomization,
As above-mentioned data, comprise broadcast singal conveyer through the random data of PRBS with randomness.
7. comprise the reception stage of utilizing the randomized digital broadcast signal of special code; And
Decode stage of digital broadcast signal of above-mentioned reception;
Digital broadcast signal comprises a plurality of frames that are made of the 1st data and the 2nd data field in above-mentioned,
Randomization has the random data method of randomization in above-mentioned the 2nd data field and utilizes a kind of method at least with comprising with predefined randomization period method of randomization in above-mentioned,
Decode phase in above-mentioned,
In the stage in identification the 2nd number district in the digital broadcast signal of above-mentioned reception, reach the no longer decoded stage of the 2nd data field of controlling above-mentioned identification and the processing method that forms broadcast singal.
8. according to asking profit to require 7 described predefined randomization period,
Above-mentioned predefined randomization period,
At least 2 above frame units, calendar frame CDF unit, minute frame unit, i.e. one of them broadcast signal processing method in the super frame unit.
9. according to claim 7 and 8 described broadcast signal processing methods,
The above-mentioned data that have randomness,
In at least one randomization period, the data in each the 2nd data field are same mutually or the data for not repeating mutually,
The processing method that comprises the transmission broadcast singal of the randomization data of passing through PRBS.
10. digital broadcast signal according to claim 7,
Above-mentioned digital broadcast signal comprises
At least have in 420,595,945 a code symbol frame head and have the information frame of the frame of 3780 symbols,
Above-mentioned frame comprises, the demodulating information that every information frame needs, and decoded information, the sign map mode, LDPC code rate is inserted pattern information, the relevant signal information of frame pattern information etc.,
Broadcast signal processing method by above-mentioned the 1st data and the 2nd data field conversion.
11. receive the acceptance division that utilizes the randomized digital broadcast signal of special code; Comprise
The decoder of the broadcast figure signal decoding of above-mentioned reception; And
Control the control part of above-mentioned decoder decode action;
Digital broadcast signal comprises a plurality of frames that are made of first data and second data area in above-mentioned,
The predefined randomization period randomised way of randomization is utilized a wherein method at least with comprising to have in above-mentioned the 2nd data field in above-mentioned in the random data method of randomization,
Above-mentioned control part,
The broadcasting signal processing apparatus of no longer decoding in the 2nd data field of above-mentioned identification is controlled in above-mentioned the 2nd data field of identification from the digital broadcast signal of above-mentioned reception.
12. control part according to claim 11,
Above-mentioned control part,
Control the decoding of the digital broadcast signal of above-mentioned reception,
The predefined randomization period of the signal of above-mentioned digital broadcasting,
At least 2 a frames above unit, calendar frame CDF, minute frame unit, i.e. wherein a kind of broadcasting signal processing apparatus in the super frame unit.
13. according to claim 11 and 12 described control parts,
Above-mentioned control part,
Control the decoding of the digital broadcast signal of above-mentioned reception,
Above-mentioned data with randomness of digital broadcast signal,
The data of each the 2nd data field are same mutually or be the data of repetition mutually not at least one randomization period,
Comprise randomized broadcasting signal processing apparatus through PRBS.
14. according to asking profit to require 11 described control parts,
Above-mentioned control part,
Control the decoding of the digital broadcast signal of above-mentioned reception,
Above-mentioned digital broadcast signal comprises
In 420,595,945 at least one have code symbol frame head and have the information frame of the frame of 3780 symbols,
Above-mentioned frame comprises: the demodulating information of each information frame needs, and decoded information, the sign map mode, LDPC code rate is inserted pattern information, the relevant signal information of frame pattern information etc.,
By the above-mentioned the 1st and the broadcasting signal processing apparatus of the 2nd data field conversion.
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| CN101167321A (en) * | 2005-03-17 | 2008-04-23 | 高通股份有限公司 | Pilot signal transmission for an orthogonal frequency division wireless communication system |
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