CN103051419B - Progressive broadcast transmission method and system - Google Patents
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Abstract
The invention discloses a progressive broadcast transmission method and a system for demodulating and decoding the progressive broadcast transmission by a receiving end surface. The method comprises the following steps of: S1, acquiring a code stream coded by a progressive information source; S2, setting channel coding bit rate and performing channel coding on the bit stream according to priority; S3, performing bit pipeline division on a physical layer sub-channel or a physical layer channel for transmitting the bit stream, so as to obtain bit pipelines with different protection degrees; S4, transmitting the bit streams in different priorities corresponding to the corresponding bit pipelines; and S5, demodulating and decoding the progressive broadcast transmission by the receiving end surface. By the progressive broadcast transmission method and the system, the progressive business containing different priority information can be transmitted in one physical layer sub-channel or the physical layer channel; different transmission and receiving conditions can be met; and the progressive transmission can be effectively realized.
Description
Technical field
The present invention relates to digital information transmission field, particularly the progressive broadcast transmission method of one and system.
Background technology
Digital communication system, comprises typical mobile radio system and received terrestrial digital broadcasting system, and one of its basic task is the error free transport realizing digital information.Utilizing chnnel coding to carry out error control is the effective method the most and the means that realize this basic task.In order to adapt to the transmission demand of digital information under common analog channel, channel coding technology needs to be combined with digital modulation technique usually.Chnnel coding and modulation be bonded code modulation system, it is the subsystem of digital communication system transmitting terminal, is also one of its nucleus module, and corresponding coding modulation technique is also the core technology of digital communication system.Corresponding with code modulation system, separate the demodulating and decoding system being bonded receiver of mediation channel-decoding, corresponding demodulating and decoding technology is also the core technology of digital communication system.
So-called modulation, represents and carries out conversion process to input data or signal, to obtain the signal being suitable for transmission, comprise various analog-modulated and digital modulation technique.To typical digital communication system, digital modulation technique mainly comprises constellation mapping technology and subsequent treatment technology thereof, as multi-carrier modulation technology and shaping filter technology etc.So-called constellation mapping, becomes to be suitable for " symbol " sequence transmitted exactly by finite field " bit " sequence mapping carrying digital information.The valued space of each symbol can be the real number space (space that such as multiple-antenna MIMO system Signal transmissions is corresponding) of one dimension real number space, two-dimentional real number space (i.e. complex number space or complex number plane) or more higher-dimension.Constellation mapping comprises two key elements, i.e. planisphere and constellation point mapping mode.Planisphere represents the set of all value compositions of constellation mapping output symbol, wherein, and a kind of value of the corresponding output symbol of each point of planisphere.Constellation point mapping mode represents the mapped specific relation of input bit (group) to constellation point, or constellation point is to the mapped specific relation of bit (group), the bit group one_to_one corresponding that usual each constellation point and a bit or multiple bit form.The planisphere of complex number space the most common and practical at present mainly contains quadrature amplitude modulation (Quadrature Amplitude Modulation, QAM), phase shift keying (Phase Shift Keying, and Amplitude phase shift keying (Amplitude-Phase Shift Keying, APSK) modulation technique PSK).
In digital communication system, binary bits is converted to discrete symbols after chnnel coding, Bit Interleave and constellation mapping etc., carry out the subsequent treatment such as orthogonal frequency division multiplexi (Orthogonal Frequency Division Multiplexing, OFDM) modulation, framing, quadrature modulation again.For band-limited channel, based on Bulk transport technology or channel equalization technique, actual continuous time, channel can be equivalent to discrete-time channel, transmission model can be equivalent to the digital baseband model that discrete symbols represents, wherein, the signal space of discrete symbols can be time domain, frequency domain and spatial domain etc., and namely time, frequency (or subcarrier), space resources (i.e. antenna resources) etc. all can carry discrete symbols waiting for transmission.
Progressively-encode (Embedded/Progressive/Scalable Coding) is a kind of message sink coding mode, coded bit arranges according to priority order from high to low, the bit that priority is higher comprises the essential information of information source, and the bit that priority is lower comprises the enhancing information of information source.For image, as shown in Figure 1, after progressively-encode, code stream is divided into 1,2,3 isopreference level bit bags, and receiving priority is after the bit bag of 1, can recover low-resolution image; Continuing to receive priority is after the bit bag of 2, can obtain intermediate resolution image; Continuing to receive priority is after the bit bag of 3, can obtain high-definition picture.
For broadcast transmission system, because progressive business packet waiting for transmission is containing the bit bag of different priorities, conventional method utilizes the physical-layer sub-channel of multiple different priorities to transmit, wherein multiple physical-layer sub-channel splits (namely by methods such as time domain, frequency domain, spatial domain, code domain, physical layer channel being divided into multiple subchannel) the simple linear of physical layer channel, when it is for progressive transmission, overall transmission efficiency is low, cannot meet different transmission and condition of acceptance.
Summary of the invention
(1) technical problem that will solve
The technical problem to be solved in the present invention is: how to provide a kind of progressive broadcast transmission method and system, to make in a physical-layer sub-channel or physical layer channel can transmission package containing the progressive business of different priorities information, different transmission and condition of acceptance can be met, can more effectively realize data progressive transmission.
(2) technical scheme
For solving the problems of the technologies described above, the invention provides a kind of progressive broadcast transmission method, the method comprising the steps of:
S1. the code stream through progressive message sink coding is obtained;
S2. described code stream is carried out chnnel coding according to priority level initializing chnnel coding code check;
S3. bit pipe division is carried out to the physical-layer sub-channel or physical layer channel that transmit described code stream, obtain the bit pipe of different degree of protection;
S4. corresponding for the code stream of different priorities corresponding bit pipe is transmitted.
Preferably, through the code stream of message sink coding described in step S1, be divided into n priority, the ratio of each priority code flow rate is p
1: p
2: ...: p
n.
Preferably, in step S2, after chnnel coding, the ratio of each priority code flow rate is l
1, l
2..., l
n, described l
1, l
2..., l
nfor integer and
m
ifor the constellation mapping exponent number of i-th symbol in every k symbol, k is integer.
Preferably, by time domain, frequency domain, spatial domain or code domain, physical layer channel is divided into multiple described physical-layer sub-channel in step S3.
Preferably, the division methods of described bit pipe is: using every k symbol of described physical-layer sub-channel or physical layer channel as one group, will
individual bit is divided into n bit pipe, and bit pipe comprises l respectively
1, l
2..., l
nindividual bit.
Preferably, described method also comprises step:
S5. receiving terminal carries out demodulating and decoding to the code stream received;
In described step S5, the method for demodulating and decoding is:
The code stream of S5.1 demodulating and decoding q=1 priority and limit priority, obtains the demodulating and decoding result of q=1 level;
If S5.2 q level is correctly decoded and needs the code stream of q+1 priority, then continue the bit stream of demodulating and decoding q+1 priority, priority q=q+1, repeat step 5.2;
If S5.3 decoding error or do not need the code stream of q+1 priority, then the 1st grade of demodulating and decoding result to q level is exported.
Present invention also offers a kind of progressive broadcast transmission system, this system comprises:
Code stream acquisition module, for obtaining the code stream through progressive message sink coding;
Channel coding module, for carrying out chnnel coding by described code stream according to priority level initializing chnnel coding code check;
Transmission pipeline divides module, for carrying out bit pipe division to the physical-layer sub-channel or physical layer channel that transmit described code stream, obtains the bit pipe of different degree of protection;
Transport module, for transmitting corresponding for the code stream of different priorities corresponding bit pipe.
Preferably, the ratio of described channel coding module each priority code flow rate after carrying out chnnel coding is l
1, l
2..., l
n, described l
1, l
2..., l
nfor integer and
m
ifor the constellation mapping exponent number of i-th symbol in every k symbol, k is integer.Preferably, described transmission pipeline divides module using every k symbol of described physical-layer sub-channel or physical layer channel as one group, general
individual bit is divided into n bit pipe, and bit pipe comprises l respectively
1, l
2..., l
nindividual bit.
Preferably, this system also comprises demodulating and decoding module, and the code stream of described demodulating and decoding module demodulating and decoding q=1 priority and limit priority, obtains the demodulating and decoding result of q=1 level; Verify, if q level is correctly decoded and needs the code stream of q+1 priority, then continue the bit stream of demodulating and decoding q+1 priority, priority q=q+1, repeated authentication; If decoding error or do not need the code stream of q+1 priority, then the 1st grade of demodulating and decoding result to q level is exported.
(3) beneficial effect
Adopt progressive broadcast transmission method of the present invention and system, transmission package in a physical-layer sub-channel or physical layer channel can be realized and, containing the progressive business of different priorities information, different transmission and condition of acceptance can be met, more effectively realize data progressive transmission.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of image progressively-encode in prior art of the present invention.
Fig. 2 is the progressive broadcast transmission method flow chart of the embodiment of the present invention.
Fig. 3 is the embodiment of the present invention progressive broadcast transmission method demodulating and decoding flow chart.
Fig. 4 is the embodiment of the present invention 256 rank Gray-APSK constellation mapping schematic diagrames.
Fig. 5 is the channel capacity and Between Signal To Noise Ratio figure that the embodiment of the present invention 256 rank Gray-APSK constellation mapping bit is corresponding.
Fig. 6 is the transmission rate of high priority code stream in the embodiment of the present invention, the transmission rate of low priority code stream and the graph of relation between the actual effective speed of high priority code stream and SNR1.
Embodiment
Below in conjunction with drawings and Examples, the specific embodiment of the present invention is described in further detail.Following examples for illustration of the present invention, but are not used for limiting the scope of the invention.
Embodiment 1
In order to more effectively transmit the information of progressively-encode, the progressive broadcast transmission method of one that the embodiment of the present invention proposes specifically comprises as shown in Figure 2:
S1, obtain code stream through progressive message sink coding, comprise the bit stream of different priorities;
S2, chnnel coding is carried out to the code stream selected channel encoder bit rate of different priorities;
S3, according to conventional method; obtain the physical-layer sub-channel for transmitting described bit stream or directly obtain physical layer channel; described physical-layer sub-channel or physical layer channel are divided further on bit level, obtains the bit pipe with different degree of protection.
S4, the code stream of different priorities is input to different bit pipes respectively transmits.
Wherein, the code stream described in step S1, is divided into n priority, and the ratio of each priority code flow rate is p
1: p
2: ...: p
n.
Wherein, the chnnel coding described in step S2 can be any channel coding technology, and the chnnel coding code check of each priority code stream is r
1, r
2..., r
n, after chnnel coding, the ratio of each priority code flow rate is l
1: l
2: ...: l
n=p
1/ r
1: p
2/ r
2: ...: p
n/ r
n, regulated by equal proportion and make l
1, l
2..., l
nfor integer and
m
ifor the constellation mapping exponent number of i-th symbol in every k symbol, k is integer.
Wherein, it is by physical layer channel being divided into multiple subchannel at time domain, frequency domain or time-frequency domain that the conventional physical layer sub-channels described in step S3 divides, and the constellation mapping mode adopted can be PAM, PSK, QAM or APSK etc., and order of modulation can be 2
m, m is positive integer.
Wherein, the bit pipe described in step S3 divides and is specially: using every k symbol of described physical-layer sub-channel as one group, by this
individual bit is divided into n bit pipe, and each bit pipe comprises l respectively
1, l
2..., l
nindividual bit.
Preferably, the method also comprises step:
S5. receiving terminal carries out demodulating and decoding to the code stream received;
In described step S5, the method for demodulating and decoding is:
The code stream of S5.1 demodulating and decoding q=1 priority and limit priority, obtains the demodulating and decoding result of q=1 level;
If S5.2 q level is correctly decoded and needs the code stream of q+1 priority, then continue the bit stream of demodulating and decoding q+1 priority, priority q=q+1, repeat step 5.2;
If S5.3 decoding error or do not need the code stream of q+1 priority, then the 1st grade of demodulating and decoding result to q level is exported.
The embodiment of the present invention also provides a kind of towards progressive broadcast transmission system, and this system comprises:
Code stream acquisition module, for obtaining the code stream through progressive message sink coding
Channel coding module, for carrying out chnnel coding by described code stream according to priority level initializing chnnel coding code check
Transmission pipeline divides module, for carrying out bit pipe division to the physical-layer sub-channel or physical layer channel that transmit described code stream, obtains the bit pipe of different degree of protection;
Transport module, for transmitting corresponding for the code stream of different priorities corresponding bit pipe;
Preferred receiving terminal also comprises:
Demodulating and decoding module as shown in Figure 3, for carrying out demodulating and decoding to the code stream received.
The code stream of this demodulating and decoding module demodulating and decoding q=1 priority and limit priority, obtains the demodulating and decoding result of q=1 level; Verify, if q level is correctly decoded and needs the code stream of q+1 priority, then continue the bit stream of demodulating and decoding q+1 priority, priority q=q+1, repeated authentication; If decoding error or do not need the code stream of q+1 priority, then the 1st grade of demodulating and decoding result to q level is exported.
Embodiment 2
Present embodiment describes a kind of progressive broadcast transmission method mapped based on LDPC coding and APSK constellation.
The method comprises:
1, the code stream through message sink coding is divided into height two different priorities, and high priority code stream is p with the ratio of low priority stream rate
1: p
2=1: 3, the signal-noise ratio threshold (SNR of low priority code stream
2) with the signal-noise ratio threshold (SNR of high priority code stream
1) difference be 10dB.
2, chnnel coding adopts the LDPC code in DVB-S2 standard to encode, and optional code check has 1/2, and 3/5,2/3,3/4,4/5,5/6.
3, symbol-modulated mode is 256 rank Gray-APSK.Wherein, the exponent number of described Gray-APSK planisphere is M=2
m, the n that counts on each ring equal and
number of rings
wherein m=m
1+ m
2, m, m
1and m
2be positive integer.As shown in Figure 4, mapping mode is prior art to described 256 rank Gray-APSK constellation mapping, and each symbol carries 8 bits, has 7 kinds of error protection degree, the bit b in each symbol
0b
7corresponding channel capacity and Between Signal To Noise Ratio are as shown in Figure 5.
In order to meet above-mentioned transmission demand, the transmission rate (R of high priority code stream
1) and the transmission rate (R of low priority code stream
2) demand fulfillment R
1≤ R
2/ 3, if do not meet above-mentioned relation, need the transmission rate of high priority code stream to reduce, the therefore actual effective transmission speed (R of high priority code stream
1eff) be R
1eff=min (R
1, R
2/ 3).
The concrete implementation step of transmitting terminal of the method for the invention comprises:
The code stream of S1, acquisition two priority, high priority code stream is p with the ratio of low priority stream rate
1: p
2=1: 3.；
S2, respectively the chnnel coding code check of selected high priority code stream and low priority code stream are r
1=r
2, and carry out chnnel coding.Obtain the code stream after chnnel coding, the ratio of its speed is l
1: l
2=1: 3.；
S3, using the symbol of every 1 Gray-APSK of physical layer channel as one group, often organize 8 bits are divided into 2 bit pipes, wherein, b
3, b
4distribute to high degree of protection pipeline, b
0, b
1, b
2, b
5, b
6, b
7distribute to low protection degree pipeline;
S4, high prioritized bit transmitted by high degree of protection bit pipe, low priority bit is transmitted by low protection degree bit pipe.
A kind of concrete implementation step of demodulating and decoding of progressive broadcast transmission method comprises:
The bit stream of S5.1, demodulating and decoding high priority, obtains the demodulating and decoding result of high priority;
If S5.2 high priority is correctly decoded and needs the bit stream of low priority, then the bit stream of demodulating and decoding low priority, and exports whole decoded result;
If S5.3 high priority decoding error or do not need the bit stream of low priority, then the decoded result of high priority is exported.
The transmitting terminal of conventional method is according to the optimization of transmission demand, by being divided into two physical-layer sub-channels to be equivalent to bit pipe of the present invention physical layer channel at time domain, frequency domain or time-frequency domain, the symbol of 40.5% is used for transmitting high priority code stream, the symbol of 59.5% is used for the code stream transmitting low priority.
Fig. 6 gives at the signal-noise ratio threshold (SNR limiting low priority code stream
2) with the signal-noise ratio threshold (SNR of high priority code stream
1) difference when being 10dB, the transmission rate (R of high priority code stream
1), the transmission rate (R of low priority code stream
2) and the actual effective speed (R of high priority code stream
1eff) and SNR
1between relation.Compared with conventional method, the actual effective transmission speed of transmission system of the present invention is higher.Because conventional method can not meet R in good signal to noise situations
1≤ R
2/ 3, cause the waste of resource, therefore transmission system of the present invention can more effectively transmit progressively-encode business.
Above execution mode is only for illustration of the present invention; and be not limitation of the present invention; the those of ordinary skill of relevant technical field; without departing from the spirit and scope of the present invention; can also make a variety of changes and modification; therefore all equivalent technical schemes also belong to category of the present invention, and scope of patent protection of the present invention should be defined by the claims.
Claims (6)
1. a progressive broadcast transmission method, is characterized in that, the method comprising the steps of:
S1. the code stream through progressive message sink coding is obtained;
S2. described code stream is carried out chnnel coding according to priority level initializing chnnel coding code check;
S3. bit pipe division is carried out to the physical-layer sub-channel or physical layer channel that transmit described code stream, obtain the bit pipe of different degree of protection;
S4. corresponding for the code stream of different priorities corresponding bit pipe is transmitted;
In step S2, after chnnel coding, the ratio of each priority code flow rate is l
1, l
2..., l
n, described l
1, l
2..., l
nfor integer and
m
ifor the constellation mapping exponent number of i-th symbol in every k symbol, k is integer;
The division methods of described bit pipe is: using every k symbol of described physical-layer sub-channel or physical layer channel as one group, will
m
iindividual bit is divided into n bit pipe, and bit pipe comprises l respectively
1, l
2..., l
nindividual bit.
2. progressive broadcast transmission method according to claim 1, is characterized in that, through the code stream of message sink coding described in step S1, is divided into n priority, and the ratio of each priority code flow rate is P
1: P
2: ...: P
n.
3. progressive broadcast transmission method according to claim 1, is characterized in that, by time domain, frequency domain, spatial domain or code domain, physical layer channel is divided into multiple described physical-layer sub-channel in step S3.
4. progressive broadcast transmission method according to claim 1, is characterized in that, described method also comprises step:
S5. receiving terminal carries out demodulating and decoding to the code stream received;
In described step S5, the method for demodulating and decoding is:
The code stream of S5.1 demodulating and decoding q=1 priority and limit priority, obtains the demodulating and decoding result of q=1 level;
If S5.2 q level is correctly decoded and needs the code stream of q+1 priority, then continue the bit stream of demodulating and decoding q+1 priority, priority q=q+1, repeat step 5.2;
If S5.3 decoding error or do not need the code stream of q+1 priority, then the 1st grade of demodulating and decoding result to q level is exported.
5. a progressive broadcast transmission system, is characterized in that, this system comprises:
Code stream acquisition module, for obtaining the code stream through progressive message sink coding;
Channel coding module, for carrying out chnnel coding by described code stream according to priority level initializing chnnel coding code check;
Transmission pipeline divides module, for carrying out bit pipe division to the physical-layer sub-channel or physical layer channel that transmit described code stream, obtains the bit pipe of different degree of protection;
Transport module, for transmitting corresponding for the code stream of different priorities corresponding bit pipe;
Wherein, the ratio of described channel coding module each priority code flow rate after carrying out chnnel coding is l
1, l
2..., l
n, described l
1, l
2..., l
nfor integer and
m
ifor the constellation mapping exponent number of i-th symbol in every k symbol, k is integer;
Wherein, described transmission pipeline divides module using every k symbol of described physical-layer sub-channel or physical layer channel as one group, general
m
iindividual bit is divided into n bit pipe, and bit pipe comprises l respectively
1, l
2..., l
nindividual bit.
6. progressive broadcast transmission system according to claim 5, is characterized in that, this system also comprises demodulating and decoding module, and the code stream of described demodulating and decoding module demodulating and decoding q=1 priority and limit priority, obtains the demodulating and decoding result of q=1 level; Verify, if q level is correctly decoded and needs the code stream of q+1 priority, then continue the bit stream of demodulating and decoding q+1 priority, priority q=q+1, repeated authentication; If decoding error or do not need the code stream of q+1 priority, then the 1st grade of demodulating and decoding result to q level is exported.
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| CN101562502A (en) * | 2009-06-04 | 2009-10-21 | 清华大学 | Physical-layer sub-channel allocation method, emission system and receiving system |
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| CN102388609A (en) * | 2009-04-08 | 2012-03-21 | 诺基亚公司 | Method and apparatus for delivery of scalable media data |
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