CN101047489B - Method for synchronous receiving program and method of correspondance transmitting program - Google Patents
Method for synchronous receiving program and method of correspondance transmitting program Download PDFInfo
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- CN101047489B CN101047489B CN200610060356XA CN200610060356A CN101047489B CN 101047489 B CN101047489 B CN 101047489B CN 200610060356X A CN200610060356X A CN 200610060356XA CN 200610060356 A CN200610060356 A CN 200610060356A CN 101047489 B CN101047489 B CN 101047489B
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Abstract
A method for synchronizing program-receiving includes receiving OFDM signal frame in receiving super-frame, using first frame of public information frame in super-frame as type of OFDM signal frame, receiving a complete public information frame and taking out program index information from received frame, confirming the coming time of program data frame containing specific program in super-frame according to program index information and receiving said program data frame when said time is up for finalizing initial receiving synchronization. The corresponding program-transmitting method is also disclosed.
Description
Technical field
The present invention relates to wireless communication field, the method for synchronous method and corresponding transmission program during program receiving in particularly a kind of digital broadcast network.
Background technology
The mobile TV technology is that for example mobile phone, mobile unit etc. provide the technology of multimedia service to portable terminal device by the received terrestrial digital broadcasting network.The mobile receptivity of this specification requirement portable terminal device receiver is better, and antijamming capability is stronger, but also requires the receiver power consumption lower, and has the ability of carrying out the switching of program searching and program fast.
Existing technical scheme, as shown in Figure 1, before each superframe, add known time domain targeting signal, wherein comprise programme information and control information in the superframe, the portable terminal device receiver is searched for targeting signal when receiving, search targeting signal after, finish the synchronous of superframe, carry out the reception of corresponding program then according to the control information in the superframe.
Yet need targeting signal is searched for always during the portable terminal device start or after switching program, it is synchronous just to finish program receiving, power consumption is bigger, and the known pilot signal done coherent detection, if flase drop is surveyed or omission when surveying, need just may correct to next targeting signal, intermediate demand is waited for the transmission course of a superframe.
Summary of the invention
The invention provides the synchronous method of a kind of program receiving, can realize receiving synchronously fast of program, to reach the purpose of saving power consumption.
The method that program receiving provided by the invention is synchronous, comprise the steps: to receive the ofdm signal frame in the superframe, described ofdm signal frame type is judged, when the type of described ofdm signal frame is the first frame of public information frame in the superframe, ofdm signal frame below then continuing to receive is until receiving a complete public information frame, from the public information frame, take out program search information, according to described program search information, determine that the program data frame that comprises specific program in the superframe arrives constantly, when this arrives constantly, the described program data frame that comprises specific program is received, it is synchronous to finish initial reception, described superframe is made of superframe public information frame and several program data frames, described superframe public information frame comprises the retrieving information of all programs in described superframe or the radio network, and described retrieving information comprises the time location information of the identification information and the program of program;
If in described program search information, do not find the retrieving information of specific program, then stop to receive the ofdm signal frame, and determine the moment that the first frame of public information frame in the next superframe arrives according to superframe structure, when arriving constantly, this receives public information frame in the next superframe, from the public information frame, take out program search information, determine that the program data frame that comprises specific program in the superframe arrives constantly, when this arrives constantly the described program data frame that comprises specific program is received, it is synchronous to finish initial reception.
Complete public information frame of described reception, the process of taking out program search information from the public information frame specifically comprises the steps: the first frame of public information frame is carried out fast fourier transform, and preserves the physical layer control signaling subcarrier of the first frame of public information frame and the constellation point symbol of data subcarrier carrying; Continue to receive the first frame of public information frame ofdm signal frame afterwards, it is carried out fast fourier transform, and preserve the constellation point symbol of its physical layer control signaling subcarrier and data subcarrier carrying; After receiving a complete public information frame, the part physical layer control signaling subcarrier that takes out each ofdm signal frame is as public information frame physical layer control signaling subcarrier; Data on the described public information frame physical layer control signaling subcarrier are carried out demodulation, deinterleaving and channel-decoding, obtain data subcarrier carries the constellation point symbol in the public information frame channel coding rate and modulation system; Data subcarrier in the public information frame is carried the constellation point symbol carry out demodulation and channel-decoding, obtain program search information.
If in described program search information, do not find the retrieving information of specific program, then stop to receive the ofdm signal frame, and determine the moment that the first frame of public information frame in the next superframe arrives according to superframe structure, when arriving constantly, this receives public information frame in the next superframe, from the public information frame, take out program search information, determine that the program data frame that comprises specific program in the superframe arrives constantly, when this arrives constantly the described program data frame that comprises specific program is received, it is synchronous to finish initial reception.
Close the receiver radio frequency device after receiving a complete public information frame, when the described program data frame that comprises specific program arrives, reopen the receiver radio frequency device.
A superframe is made of public information frame and several program data frames; A public information frame is made of continuous eight ofdm signal frames; A program data frame is made of continuous eight ofdm signal frames.
The method that program receiving provided by the invention is synchronous comprises the steps: to receive the ofdm signal frame in the superframe;
Judge this ofdm signal frame type, if the type of this ofdm signal frame is the first frame of public information frame in the superframe, receive a complete public information frame, from the public information frame, take out program search information, according to described program search information, determine that the program data frame that comprises specific program in the superframe arrives constantly, when this arrives constantly, the described program data frame that comprises specific program received that it is synchronous to finish initial reception.
If this ofdm signal frame is a program data frame head frame, then receive a complete program data frame, take out the program control signaling in this program data frame, remove to receive the first frame of public information frame in the next superframe according to described program control signaling, after receiving a complete public information frame, from the public information frame, take out program search information, according to described program search information, determine that the program data frame that comprises specific program in the superframe arrives constantly, when this arrives constantly the described program data frame that comprises specific program is received, it is synchronous to finish initial reception; If the ofdm signal frame is non-first frame of public information frame or the non-first frame of program data frame, then continues to receive the ofdm signal frame, and the ofdm signal frame type is judged, until receiving first frame of public information frame or the first frame of program data frame.
The process of this ofdm signal frame type of described judgement specifically comprises: the ofdm signal frame that receives is carried out fast fourier transform; Preserve the constellation point symbol of this ofdm signal frame physical layer control signaling subcarrier carrying; Frame type signaling constellation point symbol in the described constellation point symbol is carried out the demodulation chnnel coding, obtain the frame type signaling; Judge this ofdm signal frame type according to the frame type signaling.
Complete program data frame of described reception, take out the program control signaling in this program data frame, the process of removing to receive the first frame of public information frame in the next superframe according to described program control signaling specifically comprises the steps: to continue the first frame of program receiving Frame ofdm signal frame afterwards, it is carried out fast fourier transform, and preserve the constellation point symbol of its physical layer control signaling subcarrier carrying; After receiving a complete program data frame, the part physical layer control signaling subcarrier that takes out each ofdm signal frame is as program data frame physical layer control signaling subcarrier; Data on the described program data frame physical layer control signaling subcarrier are carried out demodulation, deinterleaving and channel-decoding, obtain program data frame physical layer control signaling; According to program data frame physical layer control signaling, determine the moment that the first frame of public information frame arrives in the next superframe, when arriving constantly, this receives the first frame of public information frame in the next superframe.
Control signaling described according to program data frame physical layer, determine the moment that the first frame of public information frame arrives in the next superframe, when this arrives constantly, receive in the next superframe before the first frame step of public information frame, also comprise step: described program data frame physical layer control signaling is carried out CRC check.
Control signaling described according to program data frame physical layer, determine the moment that the first frame of public information frame in the next superframe arrives, when this arrives constantly, receive and also comprise step in the next superframe after the first frame step of public information frame: the ofdm signal frame that receives is carried out type once more judge.
Complete public information frame of described reception, the process of taking out program search information from the public information frame specifically comprises the steps: the first frame of public information frame is carried out fast fourier transform, and preserves the physical layer control signaling subcarrier of the first frame of public information frame and the constellation point symbol of data subcarrier carrying; Continue to receive the first frame of public information frame ofdm signal frame afterwards, it is carried out fast fourier transform, and preserve the constellation point symbol of its physical layer control signaling subcarrier and data subcarrier carrying; After receiving a complete public information frame, the part physical layer control signaling subcarrier that takes out each ofdm signal frame is as public information frame physical layer control signaling subcarrier; Data on the described public information frame physical layer control signaling subcarrier are carried out demodulation, deinterleaving and channel-decoding, obtain data subcarrier carries the constellation point symbol in the public information frame channel coding rate and modulation system; Data subcarrier in the public information frame is carried the constellation point symbol carry out demodulation and channel-decoding, obtain program search information.
If in described program search information, do not find the retrieving information of specific program, then stop to receive the ofdm signal frame, and determine the moment that the first frame of public information frame in the next superframe arrives according to superframe structure, when arriving constantly, this receives public information frame in the next superframe, from the public information frame, take out program search information, determine that the program data frame that comprises specific program in the superframe arrives constantly, when this arrives constantly the described program data frame that comprises specific program is received, it is synchronous to finish initial reception.
Close the receiver radio frequency device after receiving a complete public information frame, when the described program data frame that comprises specific program arrives, reopen the receiver radio frequency device.
The present invention also comprises: during the transmission OFDM signal frame, the subcarrier in the ofdm signal frame frequency territory is divided into data subcarrier and physical layer control signaling subcarrier; With N ofdm signal frame as a unit; Utilize the data subcarrier of described unit to carry the constellation point symbol of program search information and the constellation point symbol of program data information, utilize the physical layer control signaling subcarrier of described unit to carry the constellation point symbol of ofdm signal frame frame type signaling and the constellation point symbol of physical layer control signaling, wherein N is a positive integer.
Described unit further is divided into the first kind unit and the second class unit, the constellation point symbol of the data subcarrier carrying program search information of first kind unit, the physical layer control signaling subcarrier of first kind unit carry the constellation point symbol of N ofdm signal frame frame type signaling in this unit and the constellation point symbol of this unit physical layer control signaling; The constellation point symbol of the data subcarrier carrying program data information of the second class unit, the physical layer control signaling subcarrier of the second class unit carry the constellation point symbol of N ofdm signal frame frame type signaling in this unit and the constellation point symbol of this unit physical layer control signaling.
Compared with prior art, the present invention has the following advantages:
Behind receiver start or the switching program, the process short period just can receive first frame of public information frame and complete public information frame, then according to the program search information in the public information frame, receive the program that the user need appreciate in particular moment, saved power consumption, and further, when the superframe signal is detected, flase drop is surveyed or omission is surveyed even occur, just can detect the first frame of public information frame of next superframe again through transmission time of 15 ofdm signal frames at the most, shorten the time of error correction.
Description of drawings
Fig. 1 is the structural representation of superframe in the prior art scheme;
Fig. 2 is the structural representation of superframe among the present invention;
Fig. 3 is the synchronous flow chart of the initial reception of program among the present invention;
Fig. 4 is the synchronous flow chart of program receiving course among the present invention.
Embodiment
Below in conjunction with accompanying drawing, in the dynamo-electric apparent digital broadcast network of adversary during program receiving synchronous method be described in detail, should be appreciated that mobile TV not only comprises mobile phone terminal here, also comprised other kinds portable terminal such as mobile unit, notebook computer etc.
The received terrestrial digital broadcasting net is the general time division multiplexing working method that adopts when mobile TV sends TV programme, several superframes of transmission in a timeslice, all comprising corresponding programme information in each superframe, just can be in timeslice with all program carousels of present networks one time.
See also shown in Figure 2, superframe is made of superframe public information frame and several program data frames among the present invention, the number of program data frame can be set as required, and public information frame and program data frame all are little eight frame structures, and little eight frames comprise eight ofdm signal frames; First ofdm signal frame is the first frame of public information frame in the public information frame, and first ofdm signal frame is the first frame of program data frame in the program data frame.
Superframe public information frame comprises the retrieving information of all programs in this superframe: the time location information of the identification information of program and program, if program is less certainly, the retrieving information that also can comprise all programs in the radio network comprises transmission mode signaling and program control signaling in addition; The program data frame is the base unit of programme information transmission, also comprises transmission mode signaling and program control signaling except that comprising program data information; The ofdm signal frame is by protecting interval and OFDM frame to constitute, and protecting has Cyclic Prefix to protect interval, the remainder according to protecting interval, pseudo random sequence protection interval at interval usually, to each ofdm signal frame, also comprises the frame type signaling.
During digital broadcasting network transmission superframe, the subcarrier in the ofdm signal frame frequency territory is divided into data subcarrier and physical layer control signaling subcarrier.With the program data information chnnel coding in the program search information in the public information frame, the program data frame and the modulation after the constellation point sign map to data subcarrier, just utilize data subcarrier to carry, the channel coding method here is fixed as the LDPC coding; The constellation point symbol that the frame type signaling of ofdm signal frame, public information frame physical layer control signaling (being transmission mode signaling and program control signaling) and program data frame physical layer control signaling (being transmission mode signaling and program control signaling) are carried out after chnnel coding and the modulation utilizes physical layer control signaling subcarrier to carry.
Further in order to increase the constellation point symbol energy, signal to noise ratio when improving transmission, guarantee the accuracy of reception, the constellation point symbol energy of physical layer control signaling subcarrier carrying is normalized to 16/9, and the constellation point symbol on the physical layer control signaling subcarrier is compared the signal energy gain that has about 2.5dB with program data information constellation point symbol like this.
When utilizing physical layer control signaling subcarrier beared information, select 35 equally distributed relatively physical layer control signaling subcarriers from the whole frequency domain of ofdm signal frame correspondence, for example the numbering of these subcarriers is: 52,155,258,361,464,567,670,773,876,979,1082,1185,1288,1391,1494,1597,1700,1978,2081,2184,2287,2390,2493,2596,2699,2802,2905,3008,3111,3214,3317,3420,3523,3626,3729.
The frame type signaling of ofdm signal frame represents that with 2 bits concrete implication is as shown in table 1:
The frame type signaling of table 1OFDM signal frame
Type information to the ofdm signal frame among the present invention carries out carrying out the interactive channel coding again after the BPSK modulation, for the accuracy that guarantees to transmit, respectively distribute one group of physical layer control signaling subcarrier to carry to the data behind each bit modulation, the coding, 5 physical layer control signaling subcarriers are arranged in every group, 5 physical layer control signaling subcarrier loaded information in same group are identical, and these 5 physical layer control signaling subcarriers also are relatively evenly to distribute in frequency domain, for example b
0Corresponding 155,773,1597,2596,3317 physical layer control signaling subcarrier, the b of being numbered
1Corresponding 464,1185,2184,3008,3626 the physical layer control signaling subcarrier that is numbered.
Transmission mode signaling in the public information frame, the transmission mode signaling in the program data frame are used to refer to the code rate and the modulation system of program search information, program data information respectively, see also shown in table 2, table 3, the table 4:
Table 2 transmission mode signaling
| The signaling title | Bit wide (bits) | Signaling is described |
| Code rate | 4 | The code rate of information in little eight frames is described |
| Modulation system | 4 | The modulation system of information in little eight frames is described |
Table 3 code rate pattern
Table 4 code rate pattern
Each represents that with 4 bits 16 kinds of patterns are correspondingly arranged respectively code rate and modulation system, and by a table 3 and table 4 information revealed, we just can separate the mediation channel-decoding to the constellation point symbol of program search information or program data information.Wherein the α in the table 4 represents the scale factor in the Delamination Transmission modulator approach, and α is defined as: carry minimum range between the various constellations point symbol of high priority code stream than the minimum range between last any two various constellations point symbols.
In addition, needs according to transmission, transmission information can also be divided into high priority code stream and low priority code stream, both can adopt identical code rate when the high priority code stream is carried out chnnel coding with the low priority code stream, also can adopt different code rates.
Program control signaling in the public information frame, the implication of the program control signaling in the program data frame see also shown in table 5 and the table 6:
Program control signaling in the table 5 public information frame
The sequence number that " sequence number of this superframe " signaling is indicated current superframe is the time location information of superframe just; " protection is type at interval " signaling indicates the protection of the ofdm signal frame of current transmission to belong to any pattern at interval;
Program control signaling in the table 6 program data frame
The sequence number of " sequence number of these little eight frames in superframe " signaling indication current program data frame in superframe can also learn from this sequence number that in addition next little eight frames are public information frame or program data frame.
Whether the program data frame after " next little eight frames carrying whether be identical program " signaling indication current program data frame comprises identical program, if this signaling is " 0 ", be illustrated in receive the current program data frame after, this program receives, otherwise continues to receive next program data frame.
" under this program next round sowing time time location information " signaling information is used to refer to this program in the time location information of sowing time of next round down, just which little eight frames in which superframe that current superframe is started at as the 0th superframe begin transmission, because superframe is timed sending, so only need location aware information, just can infer the moment of this program arrival next time, when this 12bits signaling information is " 0 " entirely, represent that this programming finishes.
Can find that from top form public information frame and program data frame physical layer control signaling (being transmission mode signaling and program control signaling) all contains the information of 32 bits, wherein the transmission mode signaling is 8 bits, and program control signaling is 32 bits.Adopt the transmission means of this robust to carry to public information frame and program data frame physical layer control signaling, help mobile TV and recover physical layer control signaling accurately, rapidly.
Then public information frame and program data frame physical layer control signaling are at first carried out CRC check, through generating 8 CRC check positions after the CRC check, wherein the generator polynomial of CRC check is g
CRC8(D)=D
8+ D
7+ D
4+ D
3+ D+1; Then 40 bits that obtain after the CRC check being carried out code rate is (5,1,7) " stinging tail " convolutional encoding of 1/5, establishes physical layer control signaling bit stream to be encoded and is b
39b
38... b
2b
1b
0, bit b
0Be introduced into encoder, the way of stinging the tail convolutional encoding is: last 6 the bit b that earlier initial condition of code registers are made as physical layer control signaling bit stream
39b
38b
37b
36b
35b
34, and then the beginning convolutional encoding, bit number is 200 bits after the convolutional encoding.The generator polynomial of the convolution coder of " stinging tail " is:
g
1(x)=(175)
8, the output first via of corresponding convolution coder;
g
2(x)=(131)
8The output the second tunnel of corresponding convolution coder;
g
3(x)=(135)
8The output Third Road of corresponding convolution coder;
g
4(x)=(135)
8The output the four tunnel of corresponding convolution coder;
g
5(x)=(147)
8The output the five tunnel of corresponding convolution coder;
Physical layer control signaling information adopts the benefit of " stinging tail " convolutional encoding to be: the data block length of stinging after the tail convolutional encoding is the same with the length of last coded data piece, do not need to resemble the bit of adjunct register length the common convolutional encoding, can save the bit number in the physical layer control signaling data bag as much as possible.
200 information bits after the convolutional encoding are interweaved, and the pass of output sequence number j after it interweaves and input sequence number i is j=mod (23*i, 200), i=0～199 wherein, and mod is complementation;
Again 200 information bits after interweaving are modulated as BPSK, obtain 200 BPSK constellation point symbols, because the frame type signaling of an ofdm signal frame has spent 10 physical layer control signaling subcarriers, so each ofdm signal frame also has 25 physical layer control signaling subcarriers not use, little eight frames (comprising public information frame and program data frame) then have 200 physical layer control signaling subcarriers and do not use.These 200 physical layer control signaling unit of sub-carriers with little eight frames are transmission mode signaling and the program control signaling information that a complete unit carries these little eight frames.200 constellation point symbols are got on by 200 physical layers control signaling subcarriers that the order of ofdm signal frame is mapped in little eight frames successively.
From top description, we as can be seen the present invention only need utilize less physical layer control signaling subcarrier (each ofdm signal frame only needs 35 physical layers control signaling subcarriers) just can finish the transmission that physical layer is controlled signaling and frame type signaling, and physical layer control signaling information adopts the transmission means of robust very (5 repeated encodings or code rate are interweaving of 1/5 chnnel coding and 8 OFDM symbol times) to carry, and mobile TV can recover physical layer control signaling information accurately, rapidly at receiving terminal.
Receive the ofdm signal frame of digital broadcasting network transmission after the mobile TV start, the process of specific program such as sports cast is as follows synchronously fast:
At first this ofdm signal frame type is judged, if the first frame of public information frame in the superframe, ofdm signal frame below continuing to receive is until receiving a complete public information frame, from the public information frame, take out program search information, according to described program search information, through receiving the program data frame that comprises sports cast in the superframe behind the interval after a while, it is synchronous to finish initial reception.
If non-first frame of public information frame or the non-first frame of program data frame continue to receive the ofdm signal frame and carry out the type judgement; If the first frame of program data frame, then receive a complete program data frame, take out the program control signaling in this program data frame, remove to receive public information frame in the next superframe according to described program control signaling then, according to the sports cast retrieving information in the public information frame, receive the program data frame that comprises sports cast in the superframe, it is synchronous to finish initial reception.
After initial reception is finished synchronously, from the program data frame that receives, take out program control signaling; Time location information when finding out sports cast in the program from the current program data frame control signaling then and playing next time just comprises the time location information of the program data frame of sports cast; When the program data frame that comprises sports cast of digital broadcasting network transmission arrives again, it is received, finish receiving synchronously.
Equally, technical solution of the present invention is applicable to that also the user switches program and for example switch to behind the sports cast fast the process of sports cast synchronously from music program.When user's start or program switch, do not need to carry out signal receives always, just can receive the program that the user need appreciate fast, saved power consumption, and further, when signal was detected, flase drop was surveyed or omission is surveyed even occur, just can detect the first frame of public information frame of next superframe again through transmission time of 15 ofdm signal frames at the most, shorten the time of error correction.
See also shown in Figure 3ly, Fig. 3 has disclosed that program initially receives synchronizing process among the present invention.
In step 111, mobile TV open behind the receiver radio frequency device or switch program after detect the ofdm signal frame that digital broadcast network sends.
In step 112, receiver carries out the operation of ofdm signal frame synchronization, and this is disclosed by prior art, no longer describes in detail here.
In step 113, beginning receives the ofdm signal frame synchronously.
In step 114, the ofdm signal frame that receives is carried out fast fourier transform, obtain comprising the data on the frequency domain of frame type signaling constellation point symbol, frame type signaling constellation point symbol is kept in the mobile TV buffer memory.
In step 115, frame type signaling constellation point symbol is carried out the demodulation chnnel coding, obtain the frame type signaling.
In step 116, receiver judges frame type, if 00 or 11, illustrate that present frame is the ofdm signal frame in the public information frame, execution in step 117; If 10 or 01, illustrate that present frame is the ofdm signal frame in the program data frame, execution in step 125.
In step 117, judge further whether present frame is the first frame of public information frame, and promptly whether the frame type signaling is 00, returns step 113 if not, continue to receive the ofdm signal frame, if execution in step 118.
In step 118, data on the frequency domain that obtains after the fast fourier transform are kept in the mobile TV buffer memory, the program search information constellation point symbol that comprises the data subcarrier carrying, the transmission mode signaling constellation point symbol of physical layer control signaling subcarrier carrying, program control signaling constellation point symbol.
In step 119, judge whether to receive a complete public information frame, just after the first frame of public information frame, whether receive continuous 7 frame type signalings again and be 11 ofdm signal frame, if not, return step 113, if execution in step 120.
In step 120, take out 25 physical layer control signaling subcarriers in each ofdm signal frame, be numbered 52,258,361,567,670,876,979,1082,1288,1391,1494,1700,1978,2081,2287,2390,2493,2699,2802,2905,3111,3214,3420,3523,3729, owing in the public information frame 8 ofdm signal frames are arranged, therefore always have 200 physical layer control signaling subcarriers, these 200 physical layers are controlled signaling subcarriers as a complete unit, be called public information frame physical layer control signaling subcarrier, the constellation point symbol that carries on the public information frame physical layer control signaling subcarrier is carried out demodulation, deinterleaving and channel-decoding, the transmission mode signaling and the program that obtain the public information frame are controlled signaling, see also table 2.
After step 120, to public information frame physical layer control signaling is that transmission mode signaling and program control signaling are carried out CRC check (not showing among the figure), if physical layer control signaling receives mistake, promptly the CRC check result is 1, return step 113, receive the ofdm signal frame again; If physical layer control signaling receives correct, be that the CRC check result is 0, code rate and the modulation system in the transmission mode signaling that obtains according to reception then, and channel coding method is the LDPC coding, just can carry the constellation point symbol and carry out demodulation, deinterleaving and channel-decoding, obtain program search information data subcarrier in the public information frame.
In step 121, program search information is searched.
In step 122, judged whether to find the retrieving information of specific program such as sports cast, comprise the identification information and the time location information of sports cast, if execution in step 123, execution in step 124 if not.
In step 123, identification information and time location information according to sports cast just can remove to receive sports cast, it is synchronous to finish initial reception, because superframe is timed sending, and the structure of superframe is fixed, so time location information according to sports cast, mobile TV just can be inferred the moment of the program data frame arrival that comprises sports cast and the time difference of current time, close the receiver radio frequency device, after waiting for during this period of time, open radio-frequency unit again and receive sports cast.
In step 124, mobile TV is closed the receiver radio frequency device, jumps to the first frame of next public information frame and carries out the reception of ofdm signal frame constantly, restarts step 113 to 116, once more frame type is judged; Certainly also can be chosen in step 124 back execution in step 118 in this case, the ofdm signal frame is carried out fast fourier transform, and the data on the frequency domain are kept in the mobile TV buffer memory, to be on the safe side, the present invention selects to carry out a frame type again and judges.
In step 125, judge further whether present frame is the first frame of program data frame, and promptly whether the frame type signaling is 10, returns step 113 if not, continue to receive the ofdm signal frame, if execution in step 126.
In step 126, transmission mode signaling constellation point symbol, the program control signaling constellation point symbol that obtains after the fast fourier transform in the step 114 is kept in the mobile TV buffer memory.
In step 127, judge whether to receive a complete program data frame, just after the first frame of program data frame, whether receive continuous 7 frame type signalings again and be 01 ofdm signal frame, if not, return step 113, if execution in step 128.
In step 128, obtain program data frame physical layer control signaling subcarrier according to the mode in the step 120, the constellation point symbol that carries on the program data frame physical layer control signaling subcarrier is carried out demodulation, deinterleaving and channel-decoding, obtain the transmission mode signaling and the program control signaling of program data frame.
In step 129, the transmission mode signaling and the program control signaling of program data frame are carried out CRC check, if CRC check mistake (check results is 1) is returned step 113, if correct (check results is 0), execution in step 130.
In step 130, see also table 6, just can learn the moment that the first frame of next public information frame arrives according to " sequence number of these little eight frames in superframe " in the program control signaling, mobile TV is closed the receiver radio frequency device, jump to the first frame of next public information frame and carry out the reception of ofdm signal frame constantly, restart step 113.
Top step has disclosed initial reception synchronizing process, the present invention program is after receiving the ofdm signal frame, find immediate public information frame fast, when arriving, immediate public information frame receives then, and therefrom take out program search information, find the time location information of sports cast, when specific program arrives, receive.
See also shown in Figure 5ly below, Fig. 5 has disclosed the synchronizing process in receiving course after initial reception is finished synchronously among the present invention.
After mobile TV is finished initial reception synchronously to the program data frame that comprises sports cast, ofdm signal frame of every reception, just carry out fast fourier transform, and the data after the conversion are kept in the mobile TV buffer memory, the program data information constellation point symbol that comprises the data subcarrier carrying, the transmission mode signaling constellation point symbol of physical layer control signaling subcarrier carrying, program control signaling constellation point symbol takes out 25 physical layer control signaling subcarriers in each ofdm signal frame, be numbered 52,258,361,567,670,876,979,1082,1288,1391,1494,1700,1978,2081,2287,2390,2493,2699,2802,2905,3111,3214,3420,3523,3729, in a program data frame, taken out 200 physical layer control signaling subcarriers altogether, these 200 physical layer control signaling subcarriers have just been obtained program data frame physical layer control signaling subcarrier as a complete unit, the constellation point symbol that carries on the program data frame physical layer control signaling subcarrier is carried out demodulation, deinterleaving and channel-decoding, the program that obtains the frame of program data shown in the table 6 is controlled signaling.
To signaling " next little eight frames carrying whether be identical program " judge, if " 0 ", mean that sports cast receives in this reception, just the sports cast in this superframe finishes, close the receiver radio frequency device, if " 1 ", then illustrate in the next program data frame and also comprise sports cast, continue to receive next program data frame, and take out its program and control signaling, after waiting sports cast in this superframe all to finish, close the receiver radio frequency device, just can know the time location of the next program data frame that comprises sports cast according to " under this program next round sowing time time location information " in the current program data frame program control signaling, be which little eight frames in which superframe as this program data frame of words of the 0th frame just, when this program data frame arrives, receive then with current superframe.
When from the program data frame that comprises sports cast, recovering sports cast, owing to recover physical layer control signaling (being transmission mode signaling and program control signaling) from program data frame physical layer control signaling subcarrier, just can learn in the program data frame code rate and the modulation system of sports cast constellation point symbol on the data subcarrier according to table 3, table 4, because channel coding method is the LDPC coding.Just can carry out the demodulation chnnel coding, thereby sports cast is played back on mobile phone the constellation point symbol of sports cast.
The present invention program is after finishing initial reception synchronously, utilize current program data frame physical layer control signaling just can learn the time of sports cast arrival next time, close the receiver radio frequency device then, when arriving, sports cast receives, avoided the ofdm signal frame is retrieved the trouble of bringing one by one, also effectively saved power consumption.
The present invention program can significantly bring following beneficial effect:
When user's start or switching program, do not need to carry out signal always and receive, just can realize the synchronous of program receiving fast;
Only need just can finish the function of initial synchronisation of program reception and the synchronizing function in the program receiving course with less physical layer control signaling subcarrier;
Public information frame and program data frame physical layer control signaling adopts very coding, the modulation system of robust to carry, and mobile TV can be accurately, recovery is come out rapidly;
The correctness that program data frame physical layer control signaling is recovered can be judged by CRC check;
This is external carry out specific program such as sports cast demodulation, channel-decoding the time, owing to just can learn code rate, the modulation intelligence of sports cast by program data frame physical layer control signaling, therefore when received signal, remove the constellation point symbol that sports cast constellation point outer symbol only needs storaging program data frame physical layer control signaling, saved memory space.
The above only is a preferred implementation of the present invention; should be pointed out that for those skilled in the art, under the prerequisite that does not break away from the principle of the invention; can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (14)
1. the method that program receiving is synchronous is characterized in that, comprises the steps:
Receive the ofdm signal frame in the superframe, described ofdm signal frame type is judged, when the type of described ofdm signal frame is the first frame of public information frame in the superframe, ofdm signal frame below then continuing to receive is until receiving a complete public information frame, from the public information frame, take out program search information, according to described program search information, determine that the program data frame that comprises specific program in the superframe arrives constantly, when this arrives constantly, the described program data frame that comprises specific program is received, it is synchronous to finish initial reception, described superframe is made of superframe public information frame and several program data frames, described superframe public information frame comprises the retrieving information of all programs in described superframe or the radio network, and described retrieving information comprises the time location information of the identification information and the program of program;
If in described program search information, do not find the retrieving information of specific program, then stop to receive the ofdm signal frame, and determine the moment that the first frame of public information frame in the next superframe arrives according to superframe structure, when arriving constantly, this receives public information frame in the next superframe, from the public information frame, take out program search information, determine that the program data frame that comprises specific program in the superframe arrives constantly, when this arrives constantly the described program data frame that comprises specific program is received, it is synchronous to finish initial reception.
2. the synchronous method of program receiving according to claim 1 is characterized in that, complete public information frame of described reception, and the process of taking out program search information from the public information frame specifically comprises the steps:
The first frame of public information frame is carried out fast fourier transform, and preserve the physical layer control signaling subcarrier of the first frame of public information frame and the constellation point symbol of data subcarrier carrying;
Continue to receive the first frame of public information frame ofdm signal frame afterwards, it is carried out fast fourier transform, and preserve the constellation point symbol of its physical layer control signaling subcarrier and data subcarrier carrying;
After receiving a complete public information frame, the part physical layer control signaling subcarrier that takes out each ofdm signal frame is as public information frame physical layer control signaling subcarrier;
Data on the described public information frame physical layer control signaling subcarrier are carried out demodulation, deinterleaving and channel-decoding, obtain data subcarrier carries the constellation point symbol in the public information frame channel coding rate and modulation system;
Data subcarrier in the public information frame is carried the constellation point symbol carry out demodulation and channel-decoding, obtain program search information.
3. the synchronous method of program receiving according to claim 1 is characterized in that, closes the receiver radio frequency device after receiving a complete public information frame, reopens the receiver radio frequency device when the described program data frame that comprises specific program arrives.
4. the synchronous method of program receiving according to claim 1 is characterized in that,
A superframe is made of public information frame and several program data frames;
A public information frame is made of continuous eight ofdm signal frames;
A program data frame is made of continuous eight ofdm signal frames.
5. the method that program receiving is synchronous is characterized in that, comprises the steps:
Receive the ofdm signal frame in the superframe;
Judge this ofdm signal frame type, if the type of this ofdm signal frame is the first frame of public information frame in the superframe, receive a complete public information frame, from the public information frame, take out program search information, according to described program search information, determine that the program data frame that comprises specific program in the superframe arrives constantly, when this arrives constantly, the described program data frame that comprises specific program received that it is synchronous to finish initial reception;
If this ofdm signal frame is a program data frame head frame, then receive a complete program data frame, take out the program control signaling in this program data frame, remove to receive the first frame of public information frame in the next superframe according to described program control signaling, after receiving a complete public information frame, from the public information frame, take out program search information, according to described program search information, determine that the program data frame that comprises specific program in the superframe arrives constantly, when this arrives constantly the described program data frame that comprises specific program is received, it is synchronous to finish initial reception;
If the ofdm signal frame is non-first frame of public information frame or the non-first frame of program data frame, then continues to receive the ofdm signal frame, and the ofdm signal frame type is judged, until receiving first frame of public information frame or the first frame of program data frame.
6. as the synchronous method of program receiving as described in the claim 5, it is characterized in that the process of this ofdm signal frame type of described judgement specifically comprises:
The ofdm signal frame that receives is carried out fast fourier transform;
Preserve the constellation point symbol of this ofdm signal frame physical layer control signaling subcarrier carrying;
Frame type signaling constellation point symbol in the described constellation point symbol is carried out the demodulation chnnel coding, obtain the frame type signaling;
Judge this ofdm signal frame type according to the frame type signaling.
7. as the synchronous method of program receiving as described in the claim 5, it is characterized in that, complete program data frame of described reception, take out the program control signaling in this program data frame, the process of removing to receive the first frame of public information frame in the next superframe according to described program control signaling specifically comprises the steps:
Continue the first frame of program receiving Frame ofdm signal frame afterwards, it is carried out fast fourier transform, and preserve the constellation point symbol of its physical layer control signaling subcarrier carrying;
After receiving a complete program data frame, the part physical layer control signaling subcarrier that takes out each ofdm signal frame is as program data frame physical layer control signaling subcarrier;
Data on the described program data frame physical layer control signaling subcarrier are carried out demodulation, deinterleaving and channel-decoding, obtain program data frame physical layer control signaling;
According to program data frame physical layer control signaling, determine the moment that the first frame of public information frame arrives in the next superframe, when arriving constantly, this receives the first frame of public information frame in the next superframe.
8. as the synchronous method of program receiving as described in the claim 7, it is characterized in that, control signaling described according to program data frame physical layer, determine the moment that the first frame of public information frame arrives in the next superframe, when this arrives constantly, receive in the next superframe before the first frame step of public information frame, also comprise step:
Described program data frame physical layer control signaling is carried out CRC check.
9. as the synchronous method of program receiving as described in the claim 7, it is characterized in that, control signaling described according to program data frame physical layer, determine the moment that the first frame of public information frame in the next superframe arrives, when this arrives constantly, receive and also comprise step in the next superframe after the first frame step of public information frame:
The ofdm signal frame that receives is carried out type once more to be judged.
10. as the synchronous method of program receiving as described in the claim 5, it is characterized in that, complete public information frame of described reception, the process of taking out program search information from the public information frame specifically comprises the steps:
The first frame of public information frame is carried out fast fourier transform, and preserve the physical layer control signaling subcarrier of the first frame of public information frame and the constellation point symbol of data subcarrier carrying;
Continue to receive the first frame of public information frame ofdm signal frame afterwards, it is carried out fast fourier transform, and preserve the constellation point symbol of its physical layer control signaling subcarrier and data subcarrier carrying;
After receiving a complete public information frame, the part physical layer control signaling subcarrier that takes out each ofdm signal frame is as public information frame physical layer control signaling subcarrier;
Data on the described public information frame physical layer control signaling subcarrier are carried out demodulation, deinterleaving and channel-decoding, obtain data subcarrier carries the constellation point symbol in the public information frame channel coding rate and modulation system;
Data subcarrier in the public information frame is carried the constellation point symbol carry out demodulation and channel-decoding, obtain program search information.
11. as the synchronous method of program receiving as described in the claim 5, it is characterized in that, if in described program search information, do not find the retrieving information of specific program, then stop to receive the ofdm signal frame, and determine the moment that the first frame of public information frame in the next superframe arrives according to superframe structure, when arriving constantly, this receives public information frame in the next superframe, from the public information frame, take out program search information, determine that the program data frame that comprises specific program in the superframe arrives constantly, when this arrives constantly the described program data frame that comprises specific program is received, it is synchronous to finish initial reception.
12., it is characterized in that as the synchronous method of program receiving as described in the claim 5, close the receiver radio frequency device after receiving a complete public information frame, when arriving, the described program data frame that comprises specific program reopens the receiver radio frequency device.
13. as the synchronous method of program receiving as described in the claim 5, it is characterized in that, also comprise:
During the transmission OFDM signal frame, the subcarrier in the ofdm signal frame frequency territory is divided into data subcarrier and physical layer control signaling subcarrier; With N ofdm signal frame as a unit; Utilize the data subcarrier of described unit to carry the constellation point symbol of program search information and the constellation point symbol of program data information, utilize the physical layer control signaling subcarrier of described unit to carry the constellation point symbol of ofdm signal frame frame type signaling and the constellation point symbol of physical layer control signaling, wherein N is a positive integer.
14. as the synchronous method of program receiving as described in the claim 13, it is characterized in that, described unit further is divided into the first kind unit and the second class unit, the constellation point symbol of the data subcarrier carrying program search information of first kind unit, the physical layer control signaling subcarrier of first kind unit carry the constellation point symbol of N ofdm signal frame frame type signaling in this unit and the constellation point symbol of this unit physical layer control signaling; The constellation point symbol of the data subcarrier carrying program data information of the second class unit, the physical layer control signaling subcarrier of the second class unit carry the constellation point symbol of N ofdm signal frame frame type signaling in this unit and the constellation point symbol of this unit physical layer control signaling.
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| CN1332556A (en) * | 2001-04-27 | 2002-01-23 | 清华大学 | Channel transmission method for ground digital multimeldia television broadcast system |
| CN1604646A (en) * | 2004-10-29 | 2005-04-06 | 清华大学 | Method for reducing power consumption of hand-held mobile multimedia telecasting equipment |
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| CN1332556A (en) * | 2001-04-27 | 2002-01-23 | 清华大学 | Channel transmission method for ground digital multimeldia television broadcast system |
| CN1604646A (en) * | 2004-10-29 | 2005-04-06 | 清华大学 | Method for reducing power consumption of hand-held mobile multimedia telecasting equipment |
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