CN104780136B - Constellation mapping method, base band frame forming method and de-mapping method - Google Patents

Constellation mapping method, base band frame forming method and de-mapping method Download PDF

Info

Publication number
CN104780136B
CN104780136B CN201410016921.7A CN201410016921A CN104780136B CN 104780136 B CN104780136 B CN 104780136B CN 201410016921 A CN201410016921 A CN 201410016921A CN 104780136 B CN104780136 B CN 104780136B
Authority
CN
China
Prior art keywords
stream
constellation mapping
code
mode
mapping
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN201410016921.7A
Other languages
Chinese (zh)
Other versions
CN104780136A (en
Inventor
张文军
史毅俊
徐洪亮
杨帆
赵杰
管云峰
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shanghai National Engineering Research Center of Digital Television Co Ltd
Original Assignee
Shanghai National Engineering Research Center of Digital Television Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shanghai National Engineering Research Center of Digital Television Co Ltd filed Critical Shanghai National Engineering Research Center of Digital Television Co Ltd
Priority to CN201410016921.7A priority Critical patent/CN104780136B/en
Publication of CN104780136A publication Critical patent/CN104780136A/en
Application granted granted Critical
Publication of CN104780136B publication Critical patent/CN104780136B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Abstract

A kind of constellation mapping method, base band frame forming method and de-mapping method, wherein constellation mapping method include encoding program stream to obtain bit stream；Determine used by Bit Interleave planisphere and mapping mode used by interleaving mode and constellation mapping, wherein the selection of the interleaving mode, planisphere and mapping mode at least based on being encoded to different program streams used by the code length of LDPC code in error correcting code determine；Bit Interleave and constellation mapping are carried out to the bit stream using the interleaving mode and the planisphere and mapping mode to obtain symbol stream.The different code length that the technical program considers LDPC code in error correcting code selects different constellation mapping method and interleaving mode, so as to effectively reduce the threshold level of corresponding program.

Description

Constellation mapping method, base band frame forming method and de-mapping method
Technical field
The present invention relates to coding digital information transmission field, more particularly to a kind of constellation mapping method, the base band frame side of being formed Method and de-mapping method.
Background technology
Constellation mapping refers to for the bit sequence for carrying digital information to be mapped to the symbol sebolic addressing suitable for transmission.Constellation mapping It is planisphere respectively comprising two key elements（constellation）And constellation point（Labeling）Mode.Wherein, constellation Figure represents the set of all values composition of constellation mapping output symbol, and one of the corresponding output symbol of each point in planisphere Kind value.The mapped specific relation or constellation point that constellation point mapping mode represents input bit or bit group to constellation point arrive The mapped specific relation of bit or bit group, the bit group that usually each constellation point is formed with a bit or multiple bits is one by one It is corresponding.
Quadrature amplitude modulation（Quadrature Amplitude Modulation, QAM）Constellation mapping（Abbreviation qam constellation Mapping）It is constellation mapping method common in communication system.QAM is a kind of amplitude and the combined modulation of phase, and being also will be modulated The amplitude and phase of signal change with the change of digital baseband signal.Using M（M>2）The QAM of system can be denoted as MQAM（Example Such as 16QAM, 64QAM）, M is bigger, and band efficiency is higher.
Irregular constellation mapping is mapped compared to traditional qam constellation, can effectively obtain shaping gains, improves system The technology of system capacity.DVB-NGH standards are the method for employing irregular constellation mapping.Due to different code checks error correcting code and In the case of various constellations mapping exponent number, the threshold level of system is different, and the design of irregular constellation mapping is typically basis Position Design where threshold level, therefore different error correcting code code checks and code length can correspond to different irregular constellations and reflect Penetrate.
The content of the invention
The present invention solves the problems, such as it is the threshold level for reducing irregular constellation mapping.
To solve the above problems, compiled an embodiment of the present invention provides a kind of constellation mapping method, including to program stream Code is to obtain bit stream；Determine used by Bit Interleave planisphere and mapping side used by interleaving mode and constellation mapping Formula, wherein the selection of the interleaving mode, planisphere and mapping mode at least is based on encoding different program streams being adopted The code length of LDPC code in error correcting code determines；Using the interleaving mode and the planisphere and mapping mode to the bit Stream carries out Bit Interleave and constellation mapping to obtain symbol stream.
Optionally, the selection of the interleaving mode, planisphere and mapping mode also based on the code check of LDPC code in coding, Constellation mapping exponent number and constellation type determine.
Optionally, transmitting terminal is provided with multiple planispheres, at least exists in the coding corresponding to a pair of different planisphere The type of the code check of LDPC code, constellation mapping exponent number and constellation mapping is all identical, and the two planispheres are respectively suitable for adopting The program stream encoded with the LDPC code of the first code length and the program stream for using the LDPC code of the second code length to be encoded, wherein First code length is more than second code length.Optionally, the program encoded suitable for the LDPC code using the first code length The planisphere of stream is the first planisphere, suitable for using the planisphere of program stream that the LDPC code of the second code length encoded as Two planispheres, each correspond to the first Bit Interleave mode and the second Bit Interleave mode；
Under specified channel condition and code check, selected for the program stream that the LDPC code using the first code length is encoded The threshold level ratio that first planisphere and the first Bit Interleave mode carry out constellation mapping selects the second planisphere and the first bit The threshold level that interleaving mode carries out constellation mapping is low；
Under specified channel condition and code check, selected for the program stream that the LDPC code using the second code length is encoded The threshold level ratio that second planisphere and the second Bit Interleave mode carry out constellation mapping selects the first planisphere and the second bit The threshold level that interleaving mode carries out constellation mapping is low.
Optionally, the type of the constellation mapping is all identical refers to：The two planispheres all apply to one-dimensional irregular Constellation mapping all applies to the irregular constellation mapping of two dimension.
Optionally, the channel condition specified includes Gaussian white noise channel and Ruili fading channel.
The embodiment of the present invention additionally provides a kind of forming method of base band frame, using above-mentioned constellation mapping method to each A program stream carries out constellation mapping to obtain symbol stream；The symbol stream of the different programs of correspondence is subjected to framing modulation to form base band Frame.
Optionally, the symbol stream by the different programs of correspondence carries out framing modulation is included with forming base band frame：In framing In modulated process, the inserting signaling in symbol stream, comprising in error correcting code used by being encoded to the program stream in the signaling The information of the code length of LDPC code.
Optionally, the code check of LDPC code in coding, constellation mapping exponent number and constellation type are also included in the signaling Information.
The embodiment of the present invention additionally provides a kind of de-mapping method, including receives base band frame, which is by above-mentioned base Forming method with frame obtains；Make the synchronous position with definite base band frame to the base band frame；Channel estimation is carried out to be broadcasted The situation of channel；Position and channel estimation results based on definite base band frame carry out equilibrium treatment to recover symbol stream；By this A little symbol streams disassemble into the symbol stream of the different programs of correspondence；According to from the corresponding demapping mode of transmitting terminal to different programs Symbol stream carries out demapping to obtain log-likelihood ratio stream；Log-likelihood ratio stream is carried out more each to obtain than deinterleave and decoding A bit stream.
Optionally, it is described that demapping is carried out to the symbol stream of different programs according to from transmitting terminal corresponding demapping mode Included with obtaining log-likelihood ratio stream：Planisphere and mapping mode used by the signaling received is parsed to determine transmitting terminal； Using demapping is carried out to the symbol stream of different programs from the planisphere and the corresponding demapping mode of mapping mode to obtain pair Number likelihood ratio stream.
Optionally, log-likelihood ratio stream is carried out to obtain each bit stream including than deinterleave and decoding：Parsing connects Received signaling with determine transmitting terminal used by interleaving mode；Using deinterleaving mode corresponding with the interleaving mode to logarithm Likelihood ratio stream is carried out than deinterleave and decoded to obtain each bit stream.
Optionally, the signaling received includes the code length of LDPC code in error correcting code used by being encoded to the program stream Information.
Optionally, the signaling received also includes code check, constellation mapping exponent number and the planisphere class of LDPC code in coding The information of type.
Compared with prior art, technical solution of the present invention has the advantages that：
Interleaving mode and constellation mapping method of the transmitting terminal in selection Bit Interleave（Choosing including planisphere and mapping mode Select）When, determined according to the code length of LDPC code in error correcting code used by being encoded to different program streams, so as to consider not Code length with LDPC code in error correcting code selects different constellation mapping method and interleaving mode, so as to effectively reduce corresponding program Threshold level.
Further, transmitting terminal is during base band frame is formed, and when framing is modulated, the inserting signaling in symbol stream should Signaling includes the information of the code length of LDPC code in error correcting code used by being encoded to the program stream, so that receiving terminal passes through solution Analysing the signaling can determine to dock the demapping mode of received base band frame.
Brief description of the drawings
Fig. 1 is a kind of flow diagram of the embodiment of constellation mapping method of the present invention；
Fig. 2 is a kind of flow diagram of the embodiment of the forming method of base band frame of the present invention；
Fig. 3 is a kind of flow diagram of the embodiment of de-mapping method of the present invention.
Embodiment
Inventor has found in the prior art, when transmitting terminal makees constellation mapping, does not account for using for different program streams Error correcting code in LDPC code different code length encoded in the case of receiving terminal threshold level problem.
In view of the above-mentioned problems, inventor is by research, there is provided constellation mapping method, base band frame forming method and solution are reflected Shooting method, it is contemplated that the different code length of LDPC code selects different constellation mapping method in error correcting code, so as to effectively reduce pair Answer the threshold level of program.
It is understandable to enable the above objects, features and advantages of the present invention to become apparent, below in conjunction with the accompanying drawings to the present invention Embodiment be described in detail.
As shown in Fig. 1 the flow diagram of the embodiment of a kind of constellation mapping method of the invention.With reference to Fig. 1, constellation mapping method include the following steps：
Step S11：Program stream is encoded to obtain bit stream；
Step S12：Determine used by Bit Interleave planisphere and mapping side used by interleaving mode and constellation mapping Formula, wherein the selection of the interleaving mode, planisphere and mapping mode at least is based on encoding different program streams being adopted The code length of LDPC code in error correcting code determines；
Step S13：Using the interleaving mode and the planisphere and mapping mode the bit stream is carried out Bit Interleave and Constellation mapping is to obtain symbol stream.
In the present embodiment, as described in step S11, transmitting terminal encodes different program streams to be corresponded to respectively The bit stream of different programs.In an encoding process, transmitting terminal can select entangling for different code length under conditions of code check is specified Error code carries out coded treatment to program stream.Wherein, coding module first carries out outer code（Such as BCH code）Coding, then carry out LDPC code Coding.The detail of type and LDPC code for outer code is not limited with coding mode, can using the prior art come Realize.
As described in step S12, determine used by Bit Interleave used by interleaving mode and constellation mapping planisphere and Mapping mode, wherein the selection of the interleaving mode, planisphere and mapping mode is at least based on compiling different program streams The code length of LDPC code used by code in error correcting code determines.
In practical applications, transmitting terminal can set two modules to complete constellation mapping and Bit Interleave, including interweave And the selecting module and intertexture and mapping block of constellation mapping method.
Interweave and the selecting module of constellation mapping method is according at least to carrying out different program streams to encode used error correction The code length of LDPC code in code determines a constellation mapping method（Determined including planisphere and mapping mode）.Further Ground, during the constellation mapping method is determined, the selecting module of the intertexture and constellation mapping method is also contemplated in coding The type of the code check of LDPC code, constellation mapping exponent number and constellation mapping）.
One constellation mapping method can be regarded as a function that M dimension Boolean spaces are mapped to complex field, that is, the letter The boolean vector that one length is M can be mapped as a plural number by number.The exponent number of constellation mapping is defined as 2M.The picture of the function is empty Between become planisphere.Each plural number in planisphere is known as constellation point.
It should be noted that in the present embodiment, the constellation mapping method includes selection and the mapping mode of planisphere Determine.
The type of constellation mapping includes following information：The constellation mapping is rule or irregular, the constellation mapping It is one-dimensional irregular or two-dimentional irregular.It is BPSK, 16-QAM, 64-QAM, 256-QAM, 1024- to define planisphere The constellation mapping method of the QAM of 2 even-times power order of QAM and higher is regular constellation mapping.Planisphere is not belonging to above-mentioned Scope for irregular constellation mapping.
One-dimensional irregular constellation mapping meets following condition：The value of the real part of constellation point is only tieed up in boolean vector with M M1A bit is related, with remaining M-M1A bit is unrelated, the value of the imaginary part of constellation point on the contrary, only with remaining M-M1A ratio It is special related, and the M in boolean vector is tieed up with M1A bit is unrelated, or all constellation points are after a fixed rotation, constellation The value of the real part of point only ties up the M in boolean vector with M1A bit is related, with remaining M-M1A bit is unrelated, and imaginary part takes Value and remaining M-M1A bit is related, and the M in boolean vector is tieed up with M1A bit is unrelated.The irregular constellation mapping of two dimension Meet following condition：M dimension boolean vector at least there are a bit cause constellation point real part and imaginary part value all therewith It is related.
At least there is a pair of constellation mapping method with different planispheres, entangling corresponding to them in the transmitting terminal The type of the code check of LDPC code in error code, constellation mapping exponent number and constellation mapping is all identical, but a constellation mapping method is fitted For the program stream encoded using the LDPC code of the first code length, another constellation mapping method is suitable for using the second code length The program stream that is encoded of LDPC code, wherein first code length is more than second code length（That is the first code length as long code, Second code length is as short code）.
In the present embodiment, all identical to refer to that the two planispheres all apply to one-dimensional non-for the type of the constellation mapping Regular constellation mapping all applies to the irregular constellation mapping of two dimension.
It is the first constellation mapping method to define the two constellation mapping methods respectively（Suitable for the error correction using the first code length The constellation mapping method for the program stream that code is encoded）With the second constellation mapping method（Suitable for the error correction using the second code length The program stream constellation mapping method that code is encoded）, and the corresponding interleaving mode of the first constellation mapping method is handed over for the first bit Knit mode, the corresponding interleaving mode of the second constellation mapping method is the second Bit Interleave mode.
In specified channel condition（Such as Gaussian white noise channel, Ruili fading channel etc.）With code check condition（Such as 5/6 Code check）Under, select the first constellation mapping method and the first ratio for the program stream that the LDPC code using the first code length is encoded The threshold level that special interleaving mode carries out constellation mapping is carried out than the second constellation mapping method of selection and the first Bit Interleave mode The threshold level of constellation mapping is low；And the program stream encoded for the LDPC code using the second code length selects the second constellation to reflect The threshold level ratio that shooting method and the second Bit Interleave mode carry out constellation mapping selects the first constellation mapping method and the second ratio The threshold level that special interleaving mode carries out constellation mapping is low.
As described in step S13, bit friendship is carried out to the bit stream using the interleaving mode and planisphere and mapping mode It is symbol stream to knit with constellation mapping.Interweave and mapping block is first to each group of bit by LDPC codings of encoder output Block is interleaved, and the specific method of intertexture is not construed as limiting.Then interweave and mapping block will be divided by the bit block to interweave The bit vectors for being M into one group of group length, are finally mapped to symbol stream one by one（That is plural number stream）.
Utilize constellation mapping method provided in this embodiment, it is contemplated that the different code length selection of LDPC code is different in error correcting code Constellation mapping method and interleaving mode, so as to effectively reduce the threshold level of corresponding program.
The embodiment of the present invention additionally provides a kind of forming method of base band frame.As shown in Fig. 2 a kind of base of the invention The flow diagram of the embodiment of forming method with frame.With reference to figure 2, the forming method of the base band frame includes：
Step S21：Constellation mapping is carried out to each program stream using above-mentioned constellation mapping method to obtain symbol stream；
Step S22：The symbol stream of the different programs of correspondence is subjected to framing modulation to form base band frame.
In the present embodiment, the implementation process of the step S21 refers to figure 1 above the embodiment described.
As described in the step S22, the symbol stream of the different programs of correspondence is subjected to framing modulation to form base band frame.
Specifically, the symbol stream of the different programs of correspondence is carried out framing modulation by transmitting terminal, ultimately forms base band frame.This implementation Example does not limit the specific implementation of framing modulation.The inserting signaling in framing modulated process, it is necessary in symbol stream, should The information of code length comprising the LDPC code in error correcting code used by being encoded to the program stream in signaling.Further, should The information of the code check of LDPC code, constellation mapping exponent number and constellation type in coding is also included in signaling.So easy to reception End determines the demapping mode of the received base band frame of docking by parsing the signaling.
The embodiment of the present invention additionally provides a kind of de-mapping method.As shown in Fig. 3 a kind of demapping side of the invention The flow diagram of the embodiment of method.With reference to figure 3, the de-mapping method includes：
Step S31：Base band frame is received, which obtained by the forming method of above-mentioned base band frame；
Step S32：Make the synchronous position with definite base band frame to the base band frame；
Step S33：Channel estimation is carried out to obtain the situation of broadcast channel；
Step S34：Position and channel estimation results based on definite base band frame carry out equilibrium treatment to recover symbol stream；
Step S35：These symbol streams are disassembled into the symbol stream of the different programs of correspondence；
Step S36：According to the symbol streams of different programs is carried out from the corresponding demapping mode of transmitting terminal demapping with Obtain log-likelihood ratio stream；
Step S37：Log-likelihood ratio stream is carried out than deinterleave and decoded to obtain each bit stream.
In the present embodiment, it is synchronous inclined to correct sample offset and carrier frequency to dock received base band frame work for receiving terminal Move, the situation of broadcast channel is then obtained by channel estimation, afterwards according to the position of definite base band frame and channel estimation knot Fruit carries out equilibrium treatment to recover symbol stream.Above-mentioned processing mode can be realized using the prior art.
Then, these symbol streams are disassembled into the symbol stream of the different programs of correspondence.In the present embodiment, the side specifically disassembled Formula can be corresponding with the mode of transmitting terminal framing, and details are not described herein.
As described in step S36, according to the symbol from the corresponding demapping mode of the mapping mode of transmitting terminal to different programs Number stream carries out demapping to obtain log-likelihood ratio stream.
Specifically, it is described that demapping is carried out to the symbol stream of different programs according to from transmitting terminal corresponding demapping mode Included with obtaining log-likelihood ratio stream：Planisphere and mapping mode used by the signaling received is parsed to determine transmitting terminal； Using demapping is carried out to the symbol stream of different programs from the planisphere and the corresponding demapping mode of mapping mode to obtain pair Number likelihood ratio stream.
Log-likelihood ratio stream is carried out than deinterleave and decoding to obtain each bit stream to include：Parse the letter received Interleaving mode used by making to determine transmitting terminal；Using deinterleaving mode corresponding with the interleaving mode to log-likelihood ratio stream Carry out than deinterleave and decode to obtain each bit stream.
In practical applications, receiving terminal can set De-mapping module to complete de-mapping process.The De-mapping module leads to Cross symbol stream and calculate log-likelihood ratio corresponding to different programs（Loglikelihood Ratio, LLR）Data flow（I.e. Log-likelihood ratio stream）.Further, which can include two submodules, respectively deinterleaving and constellation mapping Selecting module and deinterleaving and De-mapping module.Wherein, deinterleaving and the selecting module of constellation mapping and the intertexture of transmitting terminal And the selecting module of constellation mapping method is identical.Code check, constellation mapping exponent number, the type of constellation mapping and to different program streams The information such as the code length of the LDPC code used by being encoded in error correcting code can be, but not limited to parse from signaling and obtain.
As described in step S37, log-likelihood ratio stream is carried out than deinterleave and decoded to obtain bit stream.Wherein bit Deinterleave and the method for decoding is corresponding with the Bit Interleave and coding of transmitting terminal.Each contrast stream corresponds to each program.
An example is set forth below and further describes technical scheme.
Example 1：
For the described transmitting terminal of this example except following in addition to some, the methods of other coding, framings, complies fully with DVB-T2 Standard.
First, corresponding to each physical layer pipe in signaling has a bit instruction when whether the physical layer pipe uses Irregular constellation mapping, one-dimensional irregular star is used when also having a bit to indicate using irregular constellation mapping The constellation mapping method of seat mapping method or two dimension.For the specific position of the two bits, therefore not to repeat here.
2nd, all code checks of DVB-T2, the long code of each code check are corresponded in this example（LDPC code a length of 64800）With Short code（LDPC code a length of 16200）There are a kind of one-dimensional irregular 64-QAM, a kind of two-dimentional irregular 64-QAM, one kind respectively A kind of one-dimensional irregular 256-QAM and two-dimentional irregular 256-QAM, and each irregular 64-QAM or irregular 256- QAM corresponds to a kind of Bit Interleave method.That is, when transmitter have selected code check, order of modulation (during in 64 or 256) and code length And during using irregular constellation mapping, launching opportunity generates irregular constellation mapping method according to these information and selects bit to hand over Organization method.
For example, definition is reflected corresponding to the one-dimensional irregular 64-QAM constellation mapping methods of 1/3 code check of long code for constellation Penetrate A.The bit vectors that the input of constellation mapping A is 6 for a length, export as a plural number.Constellation mapping A is by table 1 by 6 First 3 of a bit are mapped as the real part of output, the imaginary part by rear 3 bit maps for output.Definition corresponds to 1/3 yard of short code The one-dimensional irregular 64-QAM constellation mapping methods of rate are constellation mapping B.The ratio that the input of constellation mapping B is 6 for a length Special vector, exports as a plural number.The real part that constellation mapping B is mapped as output by table 2 by first 3 of 6 bits, 3 by after A bit map is the imaginary part of output.As it can be seen that the difference of the planisphere of constellation mapping A and constellation mapping B from Tables 1 and 2.
Definition is deinterleaving method A corresponding to the deinterleaving method of constellation mapping A, and one is 1/3 by code check by deinterleaving method A Long error correcting code（LDPC code a length of 64800）It is 64800 bits to encode obtained 64800 bit block interleavings, deinterleaving method A Detail repeat no more.Definition is deinterleaving method B corresponding to the deinterleaving method of constellation mapping B, and deinterleaving method B passes through one Cross the short error correcting code that code check is 1/3（LDPC code a length of 16200）It is 16200 ratios to encode 16200 obtained bit block interleavings Spy, the detail of deinterleaving method B also repeat no more.
Table 1
Preceding 3 bit The real part of output 3 bit afterwards The imaginary part of output
000 6.1 000 6.1
001 5.9 001 5.9
010 1.9 010 1.9
011 2.1 011 2.1
100 -6.1 100 -6.1
101 -5.9 101 -5.9
110 -1.9 110 -1.9
111 -2.1 111 -2.1
Table 2
Preceding 3 bit The real part of output 3 bit afterwards The imaginary part of output
000 6.2 000 6.2
001 5.8 001 5.8
010 1.8 010 1.8
011 2.2 011 2.2
100 -6.2 100 -6.2
101 -5.8 101 -5.8
110 -1.8 110 -1.8
111 -2.2 111 -2.2
Therefore, for the transmitting equipment in this example, first according to the requirement of code check and code length to each section Mesh bit stream is encoded, and coding includes Bose-Chaudhuri-Hocquenghem Code and encoded with LDPC.Then according to code length, code check and constellation mapping type It is required that selection deinterleaving method and constellation mapping method.For example, it is 64800 to work as desired code length, and code check 1/3, constellation mapping class When type is one-dimensional irregular constellation mapping, transmitter just according to deinterleaving method A to LDPC coding output each bit block into Row interweaves, then one group of the bit stream 6 for the output that interweaves is mapped as symbol stream in a manner of constellation mapping A；When desired code length For 16200, code check 1/3, when constellation mapping type is one-dimensional irregular constellation mapping, transmitter is just according to B pairs of deinterleaving method Each bit block of LDPC coding outputs is interleaved, then one group of side with constellation mapping B of bit stream 6 by the output that interweaves Formula is mapped as symbol stream.
The coding and the obtained threshold levels of Bit Interleave method A of 1/3 code check of constellation mapping A combinations long code in AWGN and Rayleigh decline under conditions of be below 1/3 code check of constellation mapping B combinations long code coding and Bit Interleave method A in AWGN Threshold level under conditions of declining with Rayleigh.The coding and Bit Interleave method of 1/3 code check of constellation mapping B combinations short code B obtained threshold levels under conditions of AWGN and Rayleigh declines are below 1/3 code check of constellation mapping A combinations short code Coding and Bit Interleave method the B obtained threshold level under conditions of AWGN and Rayleigh declines.
And in receiving terminal, received base band frame is docked by synchronously obtaining the position of frame, corrects sampling partially and carrier frequency Partially, the situation of channel is then obtained by channel estimation, symbol stream is recovered by equilibrium afterwards, then by corresponding with originator Method disassemble into symbol stream corresponding to different programs.Demapping is calculated corresponding to not with de-interleaving block by symbol stream With program log-likelihood ratio and be deinterleaved.
De-mapping module judges the deinterleaving method and constellation mapping method of current physical layer pipeline according to signaling first.Lift For example, if being obtained by signaling resolution, the coding mode of current physical layer pipeline is the long code that code check is 1/3, constellation mapping Type is one-dimensional irregular constellation mapping, then it is deinterleaving method A to obtain deinterleaving method, and constellation mapping method is constellation mapping A, if Obtained by signaling resolution, the coding mode of current physical layer pipeline is the short code that code check is 1/3, and constellation mapping type is one-dimensional Irregular constellation mapping, then it is deinterleaving method B to obtain deinterleaving method, and constellation mapping method is constellation mapping B.Then, according to The corresponding mapping method that connects of constellation mapping method carries out demapping, recovers LLR and is handed over with the corresponding solution of deinterleaving method Organization method is deinterleaved.Each program stream is recovered finally by with the corresponding decoding algorithm of transmitting terminal.
Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this area Technical staff without departing from the spirit and scope of the present invention, may be by the methods and technical content of the disclosure above to this hair Bright technical solution makes possible variation and modification, therefore, every content without departing from technical solution of the present invention, according to the present invention Any simple modifications, equivalents, and modifications made to above example of technical spirit, belong to technical solution of the present invention Protection domain.

Claims (12)

  1. A kind of 1. constellation mapping method, it is characterised in that including：
    Program stream is encoded to obtain bit stream；
    Planisphere and mapping mode used by interleaving mode and constellation mapping are determined used by Bit Interleave, wherein the friendship Used by the selection of mode, planisphere and mapping mode is knitted at least based on being encoded to different program streams in error correcting code The code length of LDPC code determines；
    Bit Interleave and constellation mapping are carried out to the bit stream using the interleaving mode and the planisphere and mapping mode to obtain To symbol stream,
    Wherein, transmitting terminal is provided with multiple planispheres, at least there is LDPC code in the coding corresponding to a pair of different planisphere Code check, the type of constellation mapping exponent number and constellation mapping it is all identical, and the two planispheres are respectively suitable for using first Program stream that the LDPC code of code length is encoded and the program stream that is encoded of LDPC code using the second code length, wherein described the One code length is more than second code length,
    The planisphere of the program stream encoded suitable for the LDPC code for using the first code length for the first planisphere, suitable for use The planisphere for the program stream that the LDPC code of second code length is encoded is the second planisphere, each corresponding first Bit Interleave mode With the second Bit Interleave mode；
    Under specified channel condition and code check, first is selected for the program stream that the LDPC code using the first code length is encoded The threshold level ratio that planisphere and the first Bit Interleave mode carry out constellation mapping selects the second planisphere and the first Bit Interleave The threshold level that mode carries out constellation mapping is low, the program stream selection second encoded for the LDPC code using the second code length The threshold level ratio that planisphere and the second Bit Interleave mode carry out constellation mapping selects the first planisphere and the second Bit Interleave The threshold level that mode carries out constellation mapping is low.
  2. 2. constellation mapping method as claimed in claim 1, it is characterised in that the interleaving mode, planisphere and mapping side The selection of formula is determined also based on the code check of LDPC code, constellation mapping exponent number and constellation type in coding.
  3. 3. constellation mapping method as claimed in claim 1, it is characterised in that the type of the constellation mapping is all identical to be referred to： The two planispheres all apply to one-dimensional irregular constellation mapping or all apply to the irregular constellation mapping of two dimension.
  4. 4. constellation mapping method as claimed in claim 1, it is characterised in that the channel condition specified includes Gauss white noise Acoustic channel and Ruili fading channel.
  5. A kind of 5. forming method of base band frame, it is characterised in that including：
    Constellation mapping is carried out to each program stream using the constellation mapping method described in claim 1 to obtain symbol stream；
    The symbol stream of the different programs of correspondence is subjected to framing modulation to form base band frame.
  6. 6. the forming method of base band frame as claimed in claim 5, it is characterised in that the symbol stream by the different programs of correspondence Carry out framing modulation is included with forming base band frame：
    In framing modulated process, the inserting signaling in symbol stream, is used comprising being encoded to the program stream in the signaling Error correcting code in LDPC code code length information.
  7. 7. the forming method of base band frame as claimed in claim 6, it is characterised in that also comprising LDPC code in coding in the signaling Code check, the information of constellation mapping exponent number and constellation type.
  8. A kind of 8. de-mapping method, it is characterised in that including：
    Base band frame is received, which obtained as the forming method of the base band frame described in claim 5；
    Make the synchronous position with definite base band frame to the base band frame；
    Channel estimation is carried out to obtain the situation of broadcast channel；
    Position and channel estimation results based on definite base band frame carry out equilibrium treatment to recover symbol stream；
    These symbol streams are disassembled into the symbol stream of the different programs of correspondence；
    According to demapping is carried out to the symbol streams of different programs from the corresponding demapping mode of transmitting terminal to obtain log-likelihood Than stream；
    Log-likelihood ratio stream is carried out than deinterleave and decoded to obtain each bit stream.
  9. 9. de-mapping method as claimed in claim 8, it is characterised in that it is described according to the corresponding demapping side of transmitting terminal Formula carries out demapping to the symbol stream of different programs to be included with obtaining log-likelihood ratio stream：
    Planisphere and mapping mode used by the signaling received is parsed to determine transmitting terminal；
    Using demapping is carried out to the symbol stream of different programs from the planisphere and the corresponding demapping mode of mapping mode to obtain Obtain log-likelihood ratio stream.
  10. 10. de-mapping method as claimed in claim 8, it is characterised in that log-likelihood ratio stream is carried out than deinterleave and Decoding is included with obtaining each bit stream：
    Interleaving mode used by the signaling received is parsed to determine transmitting terminal；
    Log-likelihood ratio stream is carried out using deinterleaving mode corresponding with the interleaving mode than deinterleave and decoded to obtain Each bit stream.
  11. 11. the de-mapping method as described in claim 9 or 10, it is characterised in that the signaling received is included to the program stream Used by being encoded in error correcting code the code length of LDPC code information.
  12. 12. the de-mapping method as described in claim 9 or 10, it is characterised in that the signaling received is also comprising in coding The information of the code check of LDPC code, constellation mapping exponent number and constellation type.
CN201410016921.7A 2014-01-15 2014-01-15 Constellation mapping method, base band frame forming method and de-mapping method Active CN104780136B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201410016921.7A CN104780136B (en) 2014-01-15 2014-01-15 Constellation mapping method, base band frame forming method and de-mapping method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201410016921.7A CN104780136B (en) 2014-01-15 2014-01-15 Constellation mapping method, base band frame forming method and de-mapping method

Publications (2)

Publication Number Publication Date
CN104780136A CN104780136A (en) 2015-07-15
CN104780136B true CN104780136B (en) 2018-05-04

Family

ID=53621384

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201410016921.7A Active CN104780136B (en) 2014-01-15 2014-01-15 Constellation mapping method, base band frame forming method and de-mapping method

Country Status (1)

Country Link
CN (1) CN104780136B (en)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US10601546B2 (en) * 2018-04-03 2020-03-24 SK Hynix Inc. Dynamic interleaver change for bit line failures in NAND flash storage

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1949692A (en) * 2005-10-13 2007-04-18 北京泰美世纪科技有限公司 Multi-carrier digital satellite broadcasting system and digital information transmission method thereof
EP2518922A1 (en) * 2011-04-26 2012-10-31 Panasonic Corporation Bit permutation patterns for BICM with LDPC codes of rate 1/3 and QAM constellations
CN103404037A (en) * 2010-12-07 2013-11-20 索尼公司 Data processing device and data processing method

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1949692A (en) * 2005-10-13 2007-04-18 北京泰美世纪科技有限公司 Multi-carrier digital satellite broadcasting system and digital information transmission method thereof
CN103404037A (en) * 2010-12-07 2013-11-20 索尼公司 Data processing device and data processing method
EP2518922A1 (en) * 2011-04-26 2012-10-31 Panasonic Corporation Bit permutation patterns for BICM with LDPC codes of rate 1/3 and QAM constellations

Non-Patent Citations (4)

* Cited by examiner, † Cited by third party
Title
DVB-S2标准的LDPC码改进;肖扬 等;《铁道学报》;20110228;第33卷(第2期);全文 *
European Telecommunications Standards Institute 2011.Digital Video Broadcasting (DVB);Frame structure channel coding and modulation.《ETSI EN 302 755 V 1.2.1》.2011, *
LDPC码与调制技术的适配性及其应用研究;郑敏晗;《中国优秀硕士学位论文全文数据库 信息科技辑》;20090815(第08期);全文 *
LDPC编码调制技术研究;张阳;《中国优秀硕士学位论文全文数据库 信息科技辑》;20081015(第10期);全文 *

Also Published As

Publication number Publication date
CN104780136A (en) 2015-07-15

Similar Documents

Publication Publication Date Title
CN113271281B (en) Transmitting method and receiving method
US8190981B2 (en) Apparatus and method for transmitting and receiving data in a communication system using low density parity check codes
US8468396B2 (en) Channel interleaver having a constellation-based block-wise permuation module
TWI403133B (en) Method and apparatus for using multiple modulation schemes for a single packet
JP6820994B2 (en) Communication method
WO2016107160A1 (en) Data packet processing method and apparatus in ofdma system, and storage medium
EP2206262A1 (en) Apparatus and method for transmitting and receiving data in a communication system using low density parity check code
CN107222293A (en) A kind of information transferring method, device, electronic equipment and storage medium
US8630363B2 (en) Single-carrier block transmission with trellis coded modulation (TCM), multi-level coded modulation (MLCM) and bit-interleaved MLCM (BIMLCM)
JP2008295057A5 (en)
CN110071895B (en) Receiving apparatus and receiving method
JP6357547B2 (en) Transmitter device and receiver device for performing iteration before interleaving and puncturing after interleaving, and method thereof
CN102111242B (en) Method for reducing narrowband noise interference in power line carrier communication
JP5771134B2 (en) Transmitting apparatus and receiving apparatus
JP5122459B2 (en) Method and system for data diversity transmission
CN104780136B (en) Constellation mapping method, base band frame forming method and de-mapping method
CN104980251B (en) Code modulating method and decoding demodulation method
CN104780018B (en) Constellation mapping method, base band frame forming method and de-mapping method
JP4675312B2 (en) Encoding device, decoding device, transmitter, and receiver
JP2016174234A (en) Communication device and communication system
CN101515919B (en) Method for digital communication
CN109672500B (en) 8APSK mapping method of LDPC-BICM-ID system
CN104702556B (en) Constellation mapping method and de-mapping method
JP5521063B2 (en) Encoding and modulation method and decoding method for wireless communication apparatus
CN110506401B (en) Transmitter and receiver for delayed bit interleaved coded modulation

Legal Events

Date Code Title Description
C06 Publication
PB01 Publication
EXSB Decision made by sipo to initiate substantive examination
SE01 Entry into force of request for substantive examination
CB02 Change of applicant information

Address after: Room 1018, block B, No. three East Bridge Road, Pudong New Area, Shanghai, 200125, China

Applicant after: Shanghai NERC-DTV National Engineering Research Center Co., Ltd.

Address before: 200125 Shanghai East Road, Pudong New Area, No. three, No. 1018

Applicant before: Shanghai NERC-DTV National Engineering Research Center Co., Ltd.

COR Change of bibliographic data
GR01 Patent grant
GR01 Patent grant