Embodiment
Embodiments of the invention are described below in detail, the example of the embodiment is shown in the drawings, wherein from beginning to end
Same or similar label represents same or similar element or the element with same or like function.Below with reference to attached
The embodiment of figure description is exemplary, is only used for explaining the present invention, and is not construed as limiting the claims.
In order to realize the purpose of the present invention, embodiments of the invention propose in a kind of DMB and transmit data
Method.
As shown in figure 1, comprising the following steps:
S101:DMB transmitting terminal generation transmitting data frame distribution information, and the transmitting data frame is divided
DMB receiving terminal is sent to information.
Herein, it is preferable that DMB is digital audio broadcasting or DVB.But, it is of the invention
Digital audio broadcasting or DVB are not limited to, but some static media (Still can also be embodied
Media) broadcast.Static media refer to content will not over time and change digital multimedia, such as text and picture.
In one embodiment, when DMB is digital audio broadcasting, wherein transmitting data frame is distributed
Information, which is sent to DMB receiving terminal, can specifically include following steps:
DMB transmitting terminal carries out channel coding, Bit Interleave successively to transmitting data frame distribution information
With symbol mapping processing;DMB transmitting terminal will be by above-mentioned channel coding, Bit Interleave and symbol mapping processing
Transmitting data frame distribution information and the business datum multiple connection afterwards is physical signalling frame, and the physical signalling frame is sent to
DMB receiving terminal.
Preferably, the transmitting data frame after above-mentioned channel coding, Bit Interleave and symbol mapping processing is distributed and believed
Breath is that physical signalling frame specifically may comprise steps of with the business datum multiple connection:By it is described by above-mentioned channel coding,
Transmitting data frame distribution information after Bit Interleave and symbol mapping processing constitutes logical frame with the business datum;Patrolled described
Collect frame and be mapped as physical signalling frame, and sent.
Preferably, 4 physical signalling frames can constitute a physics superframe, and each physical signalling frame can include 4
Individual physical sub-frame.Each physical sub-frame can include 1 beacon symbols and Sn OFDM symbol;4 continuous logic frame groups
Into a logic superframe, each logical frame includes 4 continuous logic subframes, and each physical sub-frame includes 1 beacon symbols and Sn
Individual OFDM symbol.
More specifically, each OFDM symbol preferably includes 36 bits, and to the bit included by each OFDM symbol
C0~c35 is explained in detail as follows:
Wherein:
c0~c1Represent the position of current physical layer signal frame;
c2~c3Represent present sub-frame position;
c4~c5Represent the subframe method of salary distribution;
c6~c7Represent that transmitting data frame distributes the modulation system of information;
c8~c9Represent the modulation system of business datum;
c10~c11Represent that the hierarchical modulation of business datum is indicated;
c12Represent the coding of business datum using the instruction uniformly protected;
c13~c14Represent the LDPC encoder bit rates of business datum;
c15~c16Represent the LDPC encoder bit rates of business datum;
c17~c26Represent to retain Rfa;
c27~c29Represent CRC check position;
c30~c35Represent to retain Rfu.
In a preferred embodiment, put in order, patrolled described according to 4 continuous logic subframes in the logical frame
4 logic subframes are mapped as 4 physical sub-frames in physical signalling frame in collecting in frame, and wherein Sn is 56.
In a further advantageous embodiment, with 8 continuous logic subframes in 4 continuous logic frames in every 2 logical frames
It is for group, the logic subframe in the group is interlaced, and the interlaced logic subframe of the group is mapped as 2 continuous physicals letters
Number frame, wherein Sn is 111.
In a further advantageous embodiment, using 4 continuous logic frames as group, by i-th in each logical frame in the group
Logic subframe is sequentially mapped to i-th of physical signalling frame, and wherein i is 1,2,3 or 4.
Although constituting a physics superframe in above step with 4 physical signalling frames, each physical signalling frame includes 4
The present invention is elaborated exemplified by individual physical sub-frame, it will be appreciated by those of skill in the art that the present invention does not limit to
A physics superframe is constituted in 4 physical signalling frames, being also not limited to each physical signalling frame includes 4 physical sub-frames.
Substantially, the physical signalling frame number of a physics superframe, and the physical sub-frame number included by each physical signalling frame are constituted
Mesh can be carried out change, and the implication of the bit of OFDM symbol and every bit can make certain conversion.
In the case that subframe is not 4, the logic subframe in each logical frame be assigned in physical layer frame remain in that before and after it is suitable
Sequence is constant just can be with.
S102:Information is distributed according to the transmitting data frame by DMB receiving terminal, optionally from described
DMB transmitting terminal receives business datum.
Herein, specifically can be with step:It is true that DMB receiving terminal distributes information according to the transmitting data frame
Surely during the inoperative for not receiving during receiving the work of business datum and business datum;When during the work, numeral
Multimedia broadcasting, which is received, corresponds to the business datum that transmitting data frame distributes information, and when not during the work, numeral is more
Media broadcast does not receive business datum.
Illustrated further below with reference to the preferred embodiment that accompanying drawing is applied to digital audio broadcast system to the present invention.
Fig. 2 is logical frame of the embodiment of the present invention and physical layer frame structure schematic diagram;Fig. 3 is subframe structure of the embodiment of the present invention
Schematic diagram.
As shown in Figures 2 and 3, the digital audio broadcast system transmission structure based on OFDM include four layers, respectively superframe,
Frame, subframe and OFDM symbol.It is made up of, is made up of per frame 4 subframes 4 frames per superframe.Superframe length is 2560ms, Mei Gechao
Frame is made up of 4 length for 640ms physical layer signal frame, and each physical layer signal frame includes the son that 4 length are 160ms
Frame, each subframe includes 1 beacon and SNIndividual OFDM symbol.Each physical layer signal frame carries the data of a logical frame.Its
In, logic frame structure and physical layer signal frame structure are shown in Fig. 2, and the structure chart of subframe is shown in Fig. 3, S in these figuresNValue is referring to table 1.
Table 1
Logical frame is the data frame before subframe is distributed, and includes synchronizing information, system information, business description information and business
Data etc..Each logical frame includes 4 logic subframes, and each logic subframe includes 1 beacon symbols and SNIndividual OFDM symbol.It is right
Four continuous logical frame F1F2F3F4In logic subframe SFp,q(p=1,2,3,4, q=1,2,3,4) carries out subframe distribution,
SFp,qRepresent q-th of logic subframe in p-th of logical frame.
Wherein c0~c5Bit definitions are as follows:
c0~c1:Position of the current physical layer signal frame in a superframe, 00 represents the 1st frame;01 represents the 2nd frame;10 tables
Show the 3rd frame;11 represent the 4th frame.c2~c3:Position of the present sub-frame in a physical layer signal frame, 00 represents the 1st subframe;01
Represent the 2nd subframe;10 represent the 3rd subframe;11 represent the 4th subframe.c4~c5:The subframe method of salary distribution, 00 retains;01 represents subframe
The method of salary distribution 1;10 represent the subframe method of salary distribution 2;11 represent the subframe method of salary distribution 3.
Preferably, the present invention can be shown in Fig. 4, Fig. 5 and Fig. 6 using three kinds of different subframe methods of salary distribution, each method of salary distribution.
Fig. 4 is the schematic diagram of the subframe method of salary distribution 1 of the embodiment of the present invention 1.In Fig. 4, the subframe method of salary distribution 1 does not change in each logical frame
Four original orders of logic subframe.Specifically, put in order according to 4 continuous logic subframes in the logical frame, will
4 logic subframes are mapped as 4 physical sub-frames in physical signalling frame in the logical frame, and wherein Sn is 56.
Fig. 5 is the schematic diagram of the subframe method of salary distribution 2 of the embodiment of the present invention 2.In Figure 5, the subframe method of salary distribution 2 is by 4 companies
Each logic subframe in every 2 continuous logical frames in continuous logical frame constitutes physical layer letter in the way of shown in Fig. 5
Number frame.Specifically, 8 continuous logic subframes using in 4 continuous logic frames in every 2 logical frames is groups, by patrolling in the group
Collect subframe interlaced, and the interlaced logic subframe of the group is mapped as 2 continuous physical signal frames, wherein Sn is 111.
Fig. 6 is the schematic diagram of the subframe method of salary distribution 3 of the embodiment of the present invention 3.The subframe method of salary distribution 3 is by 4 continuous logics
Each logic subframe of frame constitutes physical layer signal frame in the way of shown in Fig. 6.Specifically, using 4 continuous logic frames as group,
I-th of logic subframe in each logical frame in the group is sequentially mapped to i-th of physical signalling frame, wherein i is 1,2,3 or 4.
Table 2 is preferred value of the OFDM symbol number in these three subframe methods of salary distribution of each subframe.
Table 2
Parameter |
Symbol |
Transmission mode 1 |
Transmission mode 2 |
Transmission mode 3 |
The OFDM symbol number of each subframe |
SN |
56 |
111 |
61 |
As can be seen here, when applying the present invention to digital audio broadcasting field, in the method for the embodiment of the present invention, root first
According to distribution state of the digital audio broadcasting transmitting terminal to multiple logical frame data transmission times, in the transmitting terminal digital audio broadcasting
Form the transmitting data frame for distributing control for control logic frame and distribute information, and carry out channel coding to it, Bit Interleave with
Symbol maps;Then formed together with being multiplexed into other pilot frequency informations and business information and send signal frame and according to transmitting data frame
Distribute information and correspondence frame transmission is carried out to broadcast singal;Then in system receiving terminal elapsed time and Frequency Synchronization, channel estimation
With it is balanced after extract carrying transmitting data frame distribute information demodulating data symbols;Then the symbol is deinterleaved again
With decoded operation;And extraction logic frame distributes related control information from the transmitting data frame distribution information after decoding, and adjust
Whole operation of receiver on off state and the corresponding reception processing of purpose logical frame execution.Pass through the present invention method, energy
Enough indicate that receiver is effectively handled receive information, therefore can be widely applied to digital multimedia broadcasting system, reduce
Receiver energy consumption.
Based on foregoing detailed description, Fig. 7 reduces power consumption schematic diagram for the receiver of the embodiment of the present invention.
As shown in fig. 7, such as current goal business datum is logical frame 1 and is transmitted according to the subframe method of salary distribution 2, then
Receiver need to only carry out signal reception in 1 and 3 subframes of the first two physical signalling frame of each superframe, and remaining time is equal
Signal can not be received, so as to realize the reception of target service and the purpose of reduction operation of receiver energy consumption.
The invention also provides the system that data are transmitted in a kind of DMB.Fig. 8 is the embodiment of the present invention
The system structure diagram of data is transmitted in DMB.
As shown in figure 8, the system includes DMB transmitting terminal 810 and DMB receiving terminal 820.
DMB transmitting terminal 810, for generating transmitting data frame distribution information, and by the transmitting data frame
Distribution information is sent to DMB receiving terminal;
DMB receiving terminal 820, for distributing information according to the transmitting data frame, optionally from described
DMB transmitting terminal receives business datum.
In said system, DMB is preferably digital audio broadcasting.When for digital audio broadcasting, numeral
Multimedia broadcasting transmitting terminal 810, can be used for carrying out channel coding, Bit Interleave successively to transmitting data frame distribution information
Handled with symbol mapping, and the transmitting data frame after above-mentioned channel coding, Bit Interleave and symbol mapping processing is distributed
Information is physical signalling frame with the business datum multiple connection, and the physical signalling frame is sent into DMB reception
End 820.
In one embodiment, DMB transmitting terminal 810, for passing through above-mentioned channel coding, ratio by described
Transmitting data frame distribution information after spy's intertexture and symbol mapping processing constitutes logical frame with the business datum, and is patrolled described
Collect frame and be mapped as physical signalling frame, and sent;The wherein 4 physical signalling frames constitute a physics superframe, each thing
Managing signal frame includes 4 physical sub-frames, and each physical sub-frame includes 1 beacon symbols and Sn OFDM symbol;4 described continuous
Logical frame constitutes a logic superframe, and each logical frame includes 4 continuous logic subframes, and each physical sub-frame includes 1 beacon
Symbol and Sn OFDM symbol.
Wherein, each OFDM symbol includes bit c0~c35;
Wherein:
c0~c1Represent the position of current physical layer signal frame;
c2~c3Represent present sub-frame position;
c4~c5Represent the subframe method of salary distribution;
c6~c7Represent that transmitting data frame distributes the modulation system of information;
c8~c9Represent the modulation system of business datum;
c10~c11Represent that the hierarchical modulation of business datum is indicated;
c12Represent the coding of business datum using the instruction uniformly protected;
c13~c14Represent the LDPC encoder bit rates of business datum;
c15~c16Represent the LDPC encoder bit rates of business datum;
c17~c26Represent to retain Rfa;
c27~c29Represent CRC check position;
c30~c35Represent to retain Rfu.
In one embodiment, DMB transmitting terminal 810, for continuously being patrolled according to 4 in the logical frame
Volume subframe is put in order, and 4 logic subframes in the logical frame are mapped as to 4 physics in physical signalling frame
Frame, wherein Sn are 56.
In another embodiment, DMB transmitting terminal 810, for being patrolled with every 2 in 4 continuous logic frames
8 continuous logic subframes of volume frame in are group, and the logic subframe in the group is interlaced, and by the interlaced logic of the group
Subframe is mapped as 2 continuous physical signal frames, and wherein Sn is 111.
In another embodiment, DMB transmitting terminal 810 is stated, for using 4 continuous logic frames as group, inciting somebody to action
I-th of logic subframe in the group in each logical frame is sequentially mapped to i-th of physical signalling frame, and wherein i is 1,2,3 or 4.
Preferably, when DMB is digital audio broadcasting, DMB receiving terminal 820 is used for
The inoperative of business datum is not received during distributing the work that information determines reception business datum according to the transmitting data frame and
Period;And when during the work, DMB, which is received, corresponds to the business number that transmitting data frame distributes information
According to when not during the work, DMB does not receive business datum.
As can be seen here, in embodiments of the present invention, receiver selectivity can be indicated using transmitting data frame distribution information
Ground receives purpose logic frame data, its operational module is closed during non-purpose logical frame, so as to reduce operation of receiver energy consumption.
Specifically, the system according to the present invention can define the transmitting data frame distribution for indicating logical frame distribution in transmitting terminal
Letter, and it is encoded, interweave and mapped with symbol, this transmitting data frame distribution information is risen with other business datums one
Send;Receive transmitting data frame distribution information to obtain transmitting terminal on multiple logical frame assignments in the receiver of receiving terminal
Status information, receives machine purpose logic frame data according to this information butt joint and does corresponding reception processing, during non-purpose logical frame
Its operational module is closed, so as to reach the purpose of reduction operation of receiver energy consumption.
The invention also provides a kind of DMB transmitting terminal.
Fig. 9 is the DMB sending end structure schematic diagram of the embodiment of the present invention.As shown in figure 9, including:Data
Frame distribution information process unit 910, physical signalling frame Multi-connection unit 920 and rf transmitter unit 930, wherein:
Data frame distributes information process unit 910, for generating transmitting data frame distribution information, and to the transmission data
Frame distribution information carries out channel coding, Bit Interleave and symbol mapping processing successively;
Physical signalling frame Multi-connection unit 920, for will by above-mentioned channel coding, Bit Interleave and symbol mapping processing after
Transmitting data frame distribution information and business datum multiple connection be physical signalling frame, and the physical signalling frame is sent to radio frequency hair
Penetrate unit 930;
Rf transmitter unit 930, for the physical signalling frame to be sent.
Based on logical construction shown in Fig. 9, Figure 10 is detailed for the DMB sending end structure of the embodiment of the present invention
Schematic diagram.
In Fig. 10, most of functions of modules is functional module commonly used in the art, at this to its function without repeating.
However, convolutional coded bits interweave and constellation mapping block 101 completes to distribute letter to the transmitting data frame of transmitting terminal
The channel coding of breath, Bit Interleave maps with symbol, preceding 6 bit information c0- in 36 system informations shown in foregoing table 2
The distribution control information of c5 formation logical frames.Logical frame framing subframe distribution physical layer signal frame module 102 will reflect by symbol
Together with system information symbol after penetrating is multiplexed into other pilot frequency informations and business information, and letter is controlled according to the distribution of logical frame
Breath carries out subframe distribution and physical layer signal framing operation (in i.e. foregoing table 2 shown in c0-c5 bits) to logical signal frame, wherein
Channel coding uses constraint length for 7 1/4 convolutional code, and the corresponding octal system generator polynomial of encoder of convolutional code is:
133,171,145,133, shift register initial value is complete " 0 ".System information shown in every 36 tables 2 independently carries out convolution
Coding.The low level of system information bit streams is in preceding, i.e. c0Preceding.Wherein:System information by convolutional encoding is handed over using bit
Knit, interweave and carried out in units of interleaving block, its interleaving algorithm is as follows:If the list entries before interweaving isWherein NMUXIt is 144 for the length of interleaving block, the output sequence after intertexture is:Then zn'=zR(n), wherein R (n) can try to achieve according to following algorithm:
Wherein, p (0)=0, p (i)=(5 × p (i-1)+q) mods, (i ≠ 0),Q=s/4-1.
System information, which is fixed, uses QPSK mapping modes.Bit stream v after Bit Interleave0,v1,v2... it is mapped as
QPSK symbol streams are sent, and various symbols mapping adds the power normalization factor, and the mean power for mapping various symbols is convergent.Star
Power normalization factor-beta is included in seat figure, when QPSK maps
The embodiment of the present invention also proposed a kind of DMB receiving terminal.Figure 11 is the numeral of the embodiment of the present invention
Multimedia broadcasting receiving terminal structural representation.
As shown in figure 11, the DMB receiving terminal includes the He of transmitting data frame distribution information resolution unit 1110
Business datum receives Unit 1120, wherein:
Transmitting data frame distribution information resolution unit 1110, is generated by it for being received from DMB transmitting terminal
Transmitting data frame distribution information, and during parsing work of the transmitting data frame distribution information to determine to receive business datum
During the inoperative for not receiving business datum;
Business datum receiving unit 1120, for when during the work, DMB reception to correspond to
Transmitting data frame distributes the business datum of information, and when not during the work, DMB does not receive business number
According to.
Based on logical construction shown in Figure 10, it is detailed that Figure 12 receives end structure for the DMB of the embodiment of the present invention
Schematic diagram.
In fig. 12, most of functions of modules is functional module commonly used in the art, for example, data subcarrier as depicted
Module 207, de-interleaving block 208, decoding module 209 are provided, at this to its function without repeating.
However, timing and frequency synchronization module 202 using the beacon signal deadline in Fig. 2 and Fig. 3 subframe structures and
Frequency Synchronization;Channel estimation and equalization module 203 completes channel estimation and equalization using the pilot signal received in signal;Transmission
The module of data frame distribution information symbol extraction module 204 extracts the demodulating data symbols of the system information shown in carrying table 2;Solution
Interweave and folding coding is carried out to symbolic information with folding coding module 205;Logical frame distributes control information 206 from decoded 36
The control bit information needed for logical frame distribution is extracted in bit system information, is transmitted to subframe switch control 201.
It is appreciated that in the multi-carrier digital broadcast system based on OFDM, by the transmitting data frame for playing control action
The transmission of information is distributed, the processing of receiver can be effectively controlled, and reduction operation of receiver time, drop can easily be reached
The purpose of low energy consumption.Fixed terminal and/or movement of this method suitable for satellite broadcasting and terrestrial wireless broadcast system are eventually
End.
Described above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.