CN107395322B - Code modulation signaling generation method and analysis method - Google Patents
Code modulation signaling generation method and analysis method Download PDFInfo
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- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/0001—Systems modifying transmission characteristics according to link quality, e.g. power backoff
- H04L1/0023—Systems modifying transmission characteristics according to link quality, e.g. power backoff characterised by the signalling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0041—Arrangements at the transmitter end
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
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- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L1/00—Arrangements for detecting or preventing errors in the information received
- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0045—Arrangements at the receiver end
- H04L1/0046—Code rate detection or code type detection
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- H—ELECTRICITY
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- H04L1/004—Arrangements for detecting or preventing errors in the information received by using forward error control
- H04L1/0056—Systems characterized by the type of code used
- H04L1/0071—Use of interleaving
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L27/00—Modulated-carrier systems
- H04L27/32—Carrier systems characterised by combinations of two or more of the types covered by groups H04L27/02, H04L27/10, H04L27/18 or H04L27/26
- H04L27/34—Amplitude- and phase-modulated carrier systems, e.g. quadrature-amplitude modulated carrier systems
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Abstract
The invention provides a code modulation signaling generation method and an analysis method, which are characterized by comprising the following steps: selecting a preset number of coded modulation mode information by matching the coded mode information with constellation mapping information; uniformly and sequentially mapping the coded modulation mode information into coded modulation signaling fields according to a preset mapping relation table; loading the corresponding code length field to generate a combined signaling field; and generating signaling in combination with other signaling fields, wherein the predetermined mapping relation table is determined in ascending or descending order according to at least one of the spectral efficiency of the coded modulation mode information and the receiving threshold. Correspondingly, the coded modulation signaling analysis method extracts the signaling and extracts a coded modulation signaling field; and determining and matching the corresponding code length, code rate and coding mode, as well as the constellation mapping order and the constellation mapping mode according to a preset mapping relation table.
Description
The invention relates to a generation method and an analysis method of coding modulation signaling, which are filed by divisional application of original cases, namely application number 201410648302.X of the original cases, and application date 2014, 11 and 14.
Technical Field
The present invention relates to the field of communications, and in particular, to a method for generating and parsing a coded modulation signaling.
Background
A coded modulation technique is one of core techniques in a communication system. Improvements to coded modulation techniques may significantly increase the transmission capability of a communication system or effectively lower the receive threshold.
Many broadcast systems, such as DVB-S2, DVB-T2, DTMB, DVB-NGH, etc., employ LDPC, a relatively advanced coding technique, in conjunction with constellation mapping and bit interleaving techniques, which in combination effectively improve the performance of the broadcast system.
In existing broadcasting systems, the coding mode and modulation mode used for a program are usually indicated by some signaling fields at the transmitting end. For example, the DTMB system utilizes a signaling field to indicate the code rate and also utilizes a signaling field to indicate the modulation order. The DVB-T2 system and the DVB-NGH system use one signaling field to indicate the code length in addition to two similar signaling fields. The DVB-NGH system uses irregular constellation mapping and a more complex bit interleaving pattern compared to the DVB-T2 system, so the implementation complexity of the coded modulation and the storage amount of coefficients of the DVB-NGH system are also larger. In this way, the development of the coded modulation technology will make the implementation burden of the transmitting end and the receiving end greater and greater, and therefore the demand for reasonable simplification of the coded modulation mode is emerging.
Furthermore, the existing broadcast standard also has a problem that the sequencing of the coded modulation mode information is arranged and mapped according to the specific code rate and the magnitude sequence of the constellation mapping mode, so that the spectral efficiency or the numerical distribution of the receiving threshold corresponding to each coded modulation mode is relatively disordered. However, users of the broadcast standard, i.e. service operators, often mainly concern the spectral efficiency and the reception threshold when selecting the coded modulation mode, rather than how the code rate and the constellation mapping mode are specific. The code table is searched out of order all the time when the system is used, so that the prior broadcasting system can not lead the user to select the code modulation mode more intuitively and conveniently.
Furthermore, the life cycle of a broadcast standard is often 10 to 20 years, during which time more advanced coded modulation techniques, although emerging, cannot be timely merged into existing standards. The deployment of each new standard also involves a large amount of infrastructure changes and terminal upgrades. The backward compatibility of standard upgrades also becomes very important.
Disclosure of Invention
The invention solves the problems that the realization burden of a transmitting end and a receiving end is large and the code modulation modes can not be reasonably and orderly arranged based on the spectrum efficiency and the receiving threshold.
In order to solve the above problem, an embodiment of the present invention provides a method for generating a coded modulation signaling, which generates a signaling for coded modulation, and is characterized by including the following steps: selecting a preset number of coded modulation mode information by matching the coded mode information with constellation mapping information; uniformly and sequentially mapping the coded modulation mode information into coded modulation signaling fields according to a preset mapping relation table; loading a corresponding code length field on the coded modulation signaling field to generate a combined signaling field; and combining the combined signaling field with other signaling fields to generate a signaling, wherein the predetermined mapping relation table is determined by ascending or descending according to at least one of spectral efficiency and a receiving threshold of coding modulation mode information, the coding mode information comprises an error correcting code coding table number, a corresponding code length, a corresponding code rate and a corresponding coding mode are determined through the error correcting code coding table number, the constellation mapping information comprises a constellation mapping table number, and a corresponding constellation mapping order and a constellation mapping mode are determined through the constellation mapping table number.
Optionally, the predetermined combination mapping table includes a certain number of undefined fields, where the certain number is obtained by subtracting the predetermined number from the maximum defined number of fields, and the undefined fields are used to define the new coding modulation mode information that should be added to upgrade the extension requirement.
Optionally, the newly added coding modulation mode information is formed by newly adding coding mode information or constellation mapping information or changing a matching relationship between the coding mode information and the constellation mapping information.
Optionally, when the receiving threshold interval between two adjacent pieces of coded modulation mode information is greater than the predetermined interval value, a new piece of coded modulation mode information is added between the two adjacent pieces of coded modulation mode information, so that the receiving threshold interval conforms to the predetermined interval value.
Optionally, when a new code modulation mode information is added to reduce the receiving threshold, the new code modulation mode information and the existing code modulation mode information adopt the same code rate, the same coding mode and the same constellation mapping order, but the constellation mapping mode adopts an iterative demapping and decoding method.
Optionally, when a new code modulation mode information is added to the depth overlay type mobile receiving, the coding mode is adopted, which has better waterfall performance although the depth of the error floor layer is reduced to some extent.
Optionally, the code length field is 1 bit, and the coded modulation signaling field is at least 6 bits.
Optionally, the coded modulation signaling field is 6 bits, and then the coded modulation signaling field is combined into a combined signaling field with 7 bits.
Optionally, the code length field is used to distinguish the long code from the short code, the maximum defined number of fields determined by the 6-bit coded modulation signaling field is 64, and when the long code is used, the predetermined number is 35, the undefined number is 29; when the predetermined number is 28 when using short codes, the undefined field is 36.
Optionally, the number of the corresponding matching relationships between the coding mode information and the constellation mapping information is selected by comparing the spectral efficiency or the receiving threshold between the similar coding modulation mode information, so as to become the predetermined number.
In addition, an embodiment of the present invention further provides a method for analyzing coded modulation signaling, which is characterized by including the following steps: extracting a signaling, wherein the signaling is generated by the code modulation signaling generation method; extracting the code length field and the code modulation signaling field from the signaling; analyzing the coded modulation mode information correspondingly according to the coded modulation signaling field according to the preset mapping relation table; determining and matching the coding mode information and the constellation mapping information according to the coding modulation mode information; and obtaining an error correction code coding table number, a corresponding code length, a corresponding code rate and a corresponding coding mode, and also obtaining a constellation mapping table number, a corresponding constellation mapping order and a constellation mapping mode through the coding mode information and the constellation mapping information.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
according to the code modulation signaling generation method and the analysis method, the transmitting end comprehensively maps the code length, the code rate, the constellation mapping order and the like to a unified extensible field through the method, namely sequentially maps the code modulation signaling field, and determines the arrangement distribution of the code modulation mode information according to at least one of the frequency spectrum efficiency and the receiving threshold, so that the receiving end can specifically identify the code length, the code rate, the constellation mapping order and the like after analyzing the code modulation mode information according to the code length field and the code modulation signaling field, and the code modulation signaling generation method and the analysis method provided by the invention not only meet the reasonable and simple requirements, but also have the reasonable and ordered arrangement of the code modulation modes, thereby enabling a user to select the code modulation modes more intuitively and conveniently, and providing possibility for backward compatibility of standard future upgrading, The expansibility is more flexible.
Drawings
Fig. 1 is a flowchart illustrating a method for generating code modulation signaling for a transmitting end according to an embodiment of the present invention;
fig. 2 is a block diagram of a process of generating coded modulation signaling at a transmitting end in an embodiment of the present invention;
fig. 3 is a flowchart illustrating a method for parsing a coded modulation signaling at a receiving end according to an embodiment of the present invention; and
fig. 4 is a block diagram of a code modulation signaling parsing process at a receiving end in an embodiment of the present invention.
Detailed Description
The inventor finds that in the prior art, the implementation burden of a transmitting end and a receiving end is large and the code modulation modes cannot be reasonably and orderly arranged based on the spectrum efficiency and the receiving threshold.
In view of the above problems, the inventors have studied and provided a coded modulation signaling generation method and an analysis method. A coded modulation signaling generation method for generating signaling for coded modulation, comprising the steps of: selecting a preset number of coded modulation mode information by matching the coded mode information with constellation mapping information; uniformly and sequentially mapping the coded modulation mode information into coded modulation signaling fields according to a preset mapping relation table; loading a corresponding code length field on the coded modulation signaling field to generate a combined signaling field; and combining the combined signaling field with other signaling fields to generate a signaling, wherein the predetermined mapping relation table is determined by ascending or descending according to at least one of spectral efficiency and a receiving threshold of coding modulation mode information, the coding mode information comprises an error correcting code coding table number, a corresponding code length, a corresponding code rate and a corresponding coding mode are determined through the error correcting code coding table number, the constellation mapping information comprises a constellation mapping table number, and a corresponding constellation mapping order and a constellation mapping mode are determined through the constellation mapping table number. In addition, the corresponding coded modulation signaling analysis method comprises the following steps: extracting a signaling, wherein the signaling is generated by the code modulation signaling generation method; extracting the code length field and the code modulation signaling field from the signaling; analyzing the coded modulation mode information correspondingly according to the coded modulation signaling field according to the preset mapping relation table; determining and matching the coding mode information and the constellation mapping information according to the coding modulation mode information; and obtaining an error correction code coding table number, a corresponding code length, a corresponding code rate and a corresponding coding mode, and also obtaining a constellation mapping table number, a corresponding constellation mapping order and a constellation mapping mode through the coding mode information and the constellation mapping information.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
The embodiment of the invention provides a method for generating a coded modulation signaling. Fig. 1 is a flowchart illustrating a method for generating code modulation signaling for a transmitting end according to an embodiment of the present invention.
Referring to fig. 1, a code modulation signaling generating method for a transmitting end, the method for generating signaling for code modulation, includes the following steps:
step S11: selecting a preset number of coded modulation mode information by matching the coded mode information with constellation mapping information;
step S12: uniformly and sequentially mapping the coded modulation mode information into coded modulation signaling fields according to a preset mapping relation table;
step S13: loading a corresponding code length field on the coded modulation signaling field to generate a combined signaling field; and
step S14: and combining the combined signaling field with other signaling fields to generate signaling.
Wherein the predetermined mapping relation table is determined in ascending order or descending order according to at least one of the spectral efficiency of the coded modulation mode information and the receiving threshold.
The coding mode information comprises an error correcting code coding table number, and the corresponding code length, code rate and coding mode are determined by the error correcting code coding table number.
The constellation mapping information comprises a constellation mapping table number, and the corresponding constellation mapping order and the constellation mapping mode are determined by the constellation mapping table number.
Fig. 2 is a block diagram of a process of generating coded modulation signaling at a transmitting end in an embodiment of the present invention. The method for generating the coded modulation signaling in fig. 1 is described below with reference to fig. 2.
And selecting a preset number of coded modulation mode information by matching the coded mode information with the constellation mapping information, and then uniformly and sequentially mapping the coded modulation mode information into coded modulation signaling fields according to a preset mapping relation table.
A code length field indicating a long code or a short code is loaded on the coded modulation signaling field to generate a combined signaling field, which is then combined with other signaling fields to generate a signaling, which is not shown in fig. 2 and is to be used for coded modulation to obtain a signaling symbol stream.
The embodiment of the invention also provides a coding modulation signaling analysis method. Fig. 3 is a flowchart illustrating a coded modulation signaling parsing method according to an embodiment of the present invention.
The coded modulation signaling parsing method is used for parsing the signaling generated by using the coded modulation signaling generating method in fig. 1, and one is used for the transmitting end and one is used for the receiving end, which correspond to the coded modulation signaling generating method in fig. 1.
As shown in fig. 3, the method for parsing coded modulation signaling includes the following steps:
step S21: extracting a signaling, wherein the signaling is generated by a code modulation signaling generation method shown in fig. 1;
step S22: extracting a code length field and a code modulation signaling field from the signaling in the step;
step S23: analyzing coded modulation mode information correspondingly from the coded modulation signaling field according to a preset mapping relation table;
step S24: determining and matching coding mode information and constellation mapping information according to the coding modulation mode information;
step S25: and obtaining an error correction code coding table number, a corresponding code length, a corresponding code rate and a corresponding coding mode, and also obtaining a constellation mapping table number, a corresponding constellation mapping order and a constellation mapping mode through the coding mode information and the constellation mapping information.
Fig. 4 is a block diagram of a code modulation signaling parsing process at a receiving end in an embodiment of the present invention.
In this embodiment, after the signaling is extracted, the signaling is analyzed to obtain a combined signaling field and other signaling fields, and then the combined signaling field is split into a code length field and a code modulation signaling field.
And correspondingly analyzing the coded modulation mode information from the coded modulation signaling field according to a preset mapping relation table corresponding to the coded modulation signaling generation method.
And determining and matching the coding mode information and the constellation mapping information corresponding to the coding modulation signaling generation method according to the coding modulation mode information.
Not shown in fig. 4, the specific information of the error correction code coding table number, the corresponding code length, the corresponding code rate, and the corresponding coding mode, as well as the constellation mapping table number, the corresponding constellation mapping order, and the constellation mapping mode are obtained through the determined coding mode information and the constellation mapping information.
The following describes the technical solution of the present invention by way of an example.
< example 1>
In an embodiment of the invention, the communication system involved comprises two versions of the standard: standard 1.0 and Standard 1.1. Wherein, version 1.1 is the upgrade of version 1.0, and the compatibility extension is performed on the basis of the standard 1.0 communication system.
Table 1 is a list of coded modulation mode information using long codes in the release 1.0 communication system in this embodiment. As shown in table 1 below, version 1.0 includes 35 sets of coded modulation mode information using long codes (code length 64800 bits), which are represented by BICM _ L0 through BICM _ L34, respectively.
Table 1: version 1.0 coded modulation mode information using Long-code (Long-code)
Table 2 is a list of coded modulation mode information for the release 1.0 communication system using short codes in this embodiment. As shown in table 2 below, version 1.0 also contains 28 sets of coded modulation mode information using short codes (16200 bits in code length), represented by BICM _ S0 through BICM _ S27, respectively.
Table 2: version 1.0 coded modulation mode information using Short-code (Short-code)
Table 3 is a list of coding mode information corresponding to the long code and the short code respectively adopted by the communication system in this embodiment.
Version 1.0 contains the error correction coding table numbers of 12 groups of long codes and the error correction coding table numbers of 12 groups of short codes, which are respectively denoted by FEC _ L0 to FEC _ L11 and FEC _ S0 to FEC _ S11, and the specific code rate values and code length values of these error correction codes are listed in table 3 below. It should be noted here that a unique code length and code rate value can be determined by one error correction coding table number, however, specific values such as the code length and the code rate cannot determine the unique error correction coding table number, and the correspondence between the values is not equireversible.
Table 3: 1.0 version coding mode information
Table 4 is a constellation mapping information list related to the communication system in the present embodiment. In the 30 sets of constellation mapping information related to version 1.0 in this embodiment, the constellation mapping information includes a constellation mapping table number, that is, represented by CONS0 to CONS29, and specific values such as a constellation mapping manner and a constellation mapping order can be determined by the constellation mapping table number.
Table 4 shows the constellation mapping orders respectively corresponding to the 30 sets of constellation mapping information.
Table 4: 1.0 version of constellation mapping information
For the standard with version 1.0, the transmitting end maps the coded modulation mode into two signaling fields: a 1-bit code length field and a 6-bit combined signaling field.
When the code modulation mode adopts a long code, the code length field is mapped to 1, and when the code modulation mode adopts a short code, the code length field is mapped to 0.
By matching the coding mode information with the constellation mapping information, a predetermined number of pieces of coded modulation mode information (35 for long codes; 28 for short codes) as shown in table 1, for example, are selected. The predetermined number is determined by comparing spectral efficiencies or reception thresholds between the similar coded modulation pattern information and selecting the number of correspondence matching relationships between the coded modulation pattern information and the constellation mapping information to be the predetermined number. For example, the selection of the better reception threshold from the coded modulation mode information with similar spectral efficiency, or the selection of the better spectral efficiency from the coded modulation mode information with similar reception threshold is preferentially determined.
As described above, when the parameters and matching relationship between the coding mode information and the constellation mapping information and the predetermined number of the coding modulation mode information are determined, the coding modulation mode information is sorted according to the predetermined mapping relationship table.
Since the coded modulation mode using the long code and the coded modulation mode using the short code are often used in different application scenarios, even on different types of receiving devices, 1 bit is used to distinguish the two first.
Table 5 below shows the values of the spectral efficiency and the receiving threshold corresponding to each piece of coded modulation mode information in the predetermined mapping relationship table when long codes are used. When different coded modulation mode information is numbered, the coded modulation mode information is arranged according to the frequency spectrum efficiency and the receiving threshold of different coded modulation modes in an ascending order, namely the coded modulation mode information with high number has higher frequency spectrum efficiency and higher receiving threshold. The principle is the same when short codes are used, and the illustration is omitted here.
Through the sorting change of the values of the spectral efficiency and the receiving threshold, it can be known that the predetermined mapping relation table is determined by ascending or descending according to at least one of the spectral efficiency and the receiving threshold of the coded modulation mode information, so that the sorting distribution sequence of the coded modulation mode information in tables 1 and 2 can be determined. For example, coded modulation mode information formed by matching between FEC _ L0 and CONS0 corresponds to BICM _ L0, and in turn, coded modulation mode information formed between FEC _ L11 and CONS29 corresponds to BICM _ L34. The corresponding principles of matching with short codes in table 2 are also communicated. Since the spectrum efficiency and the receiving threshold are mainly concerned when selecting the code modulation mode by the standard user, i.e. the service operator, rather than the specific code rate and the constellation mapping mode,
therefore, the mode can be selected more intuitively and conveniently by the user by adopting the ascending sequencing method according to the spectrum efficiency/the receiving threshold.
Table 5: 1.0 version of code modulation mode information adopting long code and corresponding frequency spectrum efficiency and receiving threshold
After reasonably sorting the predetermined number of pieces of coded modulation mode information, as shown in the following table 6, a method for generating a 1.0 version coded modulation signaling field in the present embodiment is given. The coded modulation signaling fields are uniformly and sequentially mapped according to the coded modulation mode information and a predetermined mapping relation table, for example, the coded modulation signaling fields are sequentially raised from 000000 of BICM _ L0 to 011010 of BICM _ L34 in the case of a long code, and are sequentially raised from 000000 of BICM _ S0 to 010011 of BICM _ S27 in the case of a short code. Thus, the corresponding code length field is loaded on the coded modulation signaling field to generate a combined signaling field.
It is known that a code length field is 1 bit, and a code modulation signaling field is 6 bits, which are combined into a combined signaling field of 7 bits. If the signaling generation mode of the existing DVB-T2 and DVB-NGH is adopted, the signaling with 1 bit code length is also needed, and the signaling with 4 bit code rate and the signaling with 3 bit constellation mapping order are needed. But 1 bit signaling can be saved by using the signaling generation mode of the embodiment.
In addition to the 6 bits defined in this embodiment, in order to further increase the scalability space of future version upgrade, the present invention may also use 7 bits with higher performance but increased complexity to define the coded modulation signaling field, which is at least 6 bits, and the present invention is not limited herein.
Returning to table 6, it can be seen that the predetermined combination correspondence table includes a certain number of undefined fields, which is obtained by subtracting the predetermined number from the maximum defined number of fields, and the undefined fields are used to define the new coded modulation mode information that should be added to upgrade the extension requirement. Wherein, the long code and the short code are distinguished by the code length field, the maximum defined number of fields determined by the 6-bit code modulation signaling field is 64 (64 for 6 bits), and when the long code is used, the predetermined number is 35, the undefined number is 29; when the predetermined number is 28 when using short codes, the undefined field is 36. Thus, Standard 1.0 reserves 29 undefined patterns (011011-111111) for combined signaling fields using long codes and 36 undefined patterns (010100-111111) for combined signaling fields using short codes.
The newly added code modulation mode information is formed by adding any one of the code modulation mode information or the constellation mapping information or changing the matching relationship between the code modulation mode information and the constellation mapping information.
Table 6: method for generating 1.0 version coding modulation signaling field
In this implementation, the present invention further provides an analysis method corresponding to the coded modulation signaling generation method. Similarly, after the receiving end extracts the signaling, the extracted coded modulation signaling field and the code length field obtain the error correction code coding table number in the coded modulation information and the constellation mapping table number in the constellation mapping information, and then the table 1 and the table 2 are the list of the coded modulation mode information of the short code adopted by the version 1.0 communication system in this embodiment. As shown in table 2 below, version 1.0 also contains 28 sets of coded modulation mode information using short codes (16200 bits in code length), represented by BICM _ S0 through BICM _ S27, respectively.
Table 2, table 3 and table 4 are lists of constellation mapping information related to the communication system in the present embodiment. In the 30 sets of constellation mapping information related to version 1.0 in this embodiment, the constellation mapping information includes a constellation mapping table number, that is, represented by CONS0 to CONS29, and specific values such as a constellation mapping manner and a constellation mapping order can be determined by the constellation mapping table number. Table 4 shows the constellation mapping orders respectively corresponding to the 30 sets of constellation mapping information.
Table 4 obtains the error correction code coding table number, the corresponding code rate and code length, the constellation mapping table number, the corresponding constellation mapping order and the constellation mapping mode, and finally obtains the specific details of coding and constellation mapping through the information.
In order to upgrade and extend version 1.0, in the implementation process of the version 1.1 standard, we want to add the following 4 pieces of coded modulation mode information:
1. the reception threshold interval of the short code BICM _ S26 and BICM _ S27 modes is too large, and a new coded modulation mode information BICM _ S28 is added so that its reception threshold is between BICM _ S26 and BICM _ S27. Like BICM _ S26 and BICM _ S27, BICM _ S28 also uses a constellation mapping pattern of 256-QAM, but with another code rate, 5/6. Therefore, BICM _ S28 uses a new ECC coding scheme with the ECC coding table number FEC _ S12. Correspondingly, we also design a new constellation mapping information CONS30 for it. Therefore, it is possible to solve the problem that the reception threshold interval is too large so that the reception threshold interval conforms to the predetermined interval value.
2. The threshold interval of the long code BICM _ L33 and BICM _ L34 modes is too large, and a new piece of coded modulation mode information BICM _ L35 is added so that its reception threshold is between BICM _ L33 and BICM _ L34. Like BICM _ L33 and BICM _ L34, BICM _ L35 also uses a 1024-QAM constellation mapping scheme, but with another code rate, 5/6. Therefore, BICM _ L35 uses a new ECC coding scheme with the ECC coding table number FEC _ L12. Correspondingly, we also design a new constellation mapping information CONS31 for it. Therefore, it is possible to solve the problem that the reception threshold interval is too large so that the reception threshold interval conforms to the predetermined interval value.
3, the BICM _ L34 has the highest receiving threshold, so a new coded modulation mode information BICM _ L36 is added to be lower than the receiving threshold, and it is known that the method of iterative demapping and decoding (BICM-ID) can effectively reduce the receiving threshold, so that the code rate, coding mode and constellation mapping order of BICM _ L36 are the same as BICM _ L34, but the constellation mapping mode is selected to be more suitable for iterative demapping and decoding. That is, BICM _ L36 also adopts FEC _ L11, so its code rate is still 13/15, but it adopts a new constellation mapping information CONS 32. Thus, the reception threshold is lowered.
BICM _ S0 for mobile reception with deep coverage we have found that the error-level requirements for this type of application are not as high as considered when the 1.0 standard is established, so we add a new coded modulation mode information BICM _ S29, making its coding mode FEC _ S13 have the same code rate (2/15) as BICM _ S0, but the waterfall performance is better, and the error-level depth is sacrificed, being raised and reduced. The constellation mapping information of BICM _ S29 does not need to be changed and remains as CONS 0. Therefore, the newly added BICM _ S29 is made more suitable for mobile reception of deep coverage.
The newly added coded modulation mode information and the corresponding coded modulation signaling field are defined by table 7 and table 8 through the following.
Table 7: method for generating code modulation combined field adopting long code for newly adding version 1.1
| Coded modulation signalling field | Encoding modulation mode information | Error correcting code coding table number | Code rate | Constellation mapping table number | Constellation mapping order |
| 011011 | BICM_L35 | FEC_L12 | 5/6 | CONS31 | 1024-QAM |
| 011100 | BICM_L36 | FEC_L11 | 13/15 | CONS32 | 1024-QAM |
Table 8: method for generating code modulation combined field adopting short code for newly adding version 1.1
| Coded modulation signalling field | Encoding modulation mode information | Error correcting code coding table number | Code rate | Constellation mapping table number | Constellation mapping order |
| 010100 | BICM_S28 | FEC_S12 | 5/6 | CONS30 | 256-QAM |
| 010101 | BICM_S29 | FEC_S13 | 2/15 | CONS0 | QPSK |
Compared with the existing DVB-T2 and DVB-NGH modes, the method for generating the coded modulation signaling and the method for analyzing the coded modulation signaling have the following advantages that:
1. since the coding and constellation mapping scheme adopted by the BICM _ L36 is identical to that of the BICM _ L34, the coded modulation signaling field of the DVB-T2 is generated in a manner that cannot provide a unique coded modulation signaling field value for the BICM _ L36 to distinguish the BICM _ L34 in the existing system version.
2. Since the code length and code rate of the coding adopted by the BICM _ S29 are the same as those of the BICM _ S0, and the constellation mapping method is also the same, the generation method of the coded modulation signaling field of the DVB-T2 cannot provide a unique coded modulation signaling field value for the BICM _ S29 to distinguish the BICM _ S0 in the existing system version.
3. The expansibility of the coding modulation mode signaling field generation mode adopted by the invention is more flexible. For example, 29 undefined patterns reserved for the coded modulation mode using the long code may be flexibly provided for the newly added coding scheme and constellation mapping scheme, instead of respectively limiting the upper limits of the numbers of the newly added coding scheme and the newly added constellation mapping scheme.
Although the present invention has been described with reference to the preferred embodiments, it is not intended to limit the present invention, and those skilled in the art can make variations and modifications of the present invention without departing from the spirit and scope of the present invention by using the methods and technical contents disclosed above.
Claims (8)
1. A method for generating coded modulation signaling, generating signaling for coded modulation, comprising the steps of:
selecting a preset number of coded modulation mode information by matching the coded mode information with constellation mapping information;
mapping the coded modulation mode information into coded modulation signaling fields in sequence according to a preset mapping relation table;
loading a corresponding code length field on the coded modulation signaling field to generate a combined signaling field; and
combining the combined signaling field with other signaling fields to generate the signaling;
wherein the coding mode information comprises an ECC coding table number, and the corresponding code length, code rate and coding mode are determined by the ECC coding table number,
the constellation mapping information comprises a constellation mapping table number, and the corresponding constellation mapping order and the constellation mapping mode are determined by the constellation mapping table number,
the predetermined mapping relation table is determined according to at least one of the spectral efficiency and the receiving threshold of the coded modulation mode information in an ascending order or a descending order;
wherein the predetermined mapping relation table contains a certain number of undefined fields,
the certain number is a maximum defined number of fields minus the predetermined number,
the undefined field is used for defining the coded modulation mode information which is newly added due to upgrading of extension requirements;
when a new code modulation mode information is received aiming at the depth covering type movement, the new code modulation mode information adopts a coding mode of reducing the depth of an error code level layer;
comparing the frequency spectrum efficiency or the receiving threshold between the adjacent coding modulation mode information, and selecting the number of the corresponding matching relations between the coding mode information and the constellation mapping information, namely the number is the preset number.
2. The coded modulation signaling generating method of claim 1, wherein:
the newly added coding modulation mode information is newly added by the coding mode information or the constellation mapping information, or is formed by the change of the matching relationship between the coding mode information and the constellation mapping information.
3. The coded modulation signaling generating method of claim 1, wherein:
when the receiving threshold interval between two adjacent coded modulation mode information is larger than a preset interval value, a new piece of coded modulation mode information is added between the two adjacent coded modulation mode information, so that the receiving threshold interval conforms to the preset interval value.
4. The coded modulation signaling generating method of claim 3, wherein:
when a new code modulation mode information is added to reduce the receiving threshold interval, the new code modulation mode information and the existing code modulation mode information adopt the same code rate, the same coding mode and the same constellation mapping order, and the constellation mapping mode of the new code modulation mode information adopts an iterative demapping and decoding method.
5. The code modulation signaling generation method of claim 1, characterized by:
wherein, the code modulation signaling field is at least 6 bits, and the code length field is 1 bit.
6. The coded modulation signaling generating method of claim 5, wherein:
wherein, the coded modulation signaling field is 6 bits, and the generated combined signaling field is 7 bits.
7. The coded modulation signaling generating method of claim 6, wherein:
wherein the code length field is used to distinguish between long codes and short codes,
the maximum defined number of fields determined by the 6-bit coded modulation signaling field is 64, the predetermined number is 35 when long codes are used, and the undefined number is 29; when a short code is used, the predetermined number is 28 and the undefined field is 36.
8. A method for analyzing code modulation signaling is characterized by comprising the following steps:
extracting signaling generated by the code modulation signaling generation method according to claim 1;
extracting the code length field and the code modulation signaling field of claim 1 from the signaling;
the predetermined mapping relation table according to claim 1, correspondingly parsing the coded modulation signaling field to obtain the coded modulation mode information;
determining, from the coded modulation mode information, that the coded mode information and the constellation mapping information according to claim 1 are matched; and
and obtaining an error correction code coding table number, a corresponding code length, a corresponding code rate and a corresponding coding mode, a constellation mapping table number, a corresponding constellation mapping order and a constellation mapping mode according to the coding mode information and the constellation mapping information.
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