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GB/T 39348-2020Space data and information transfer systems - TM (telemetry)synchronization and channel coding (English PDF)

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

November 19, 2020

Implementation date

June 1, 2021

Scope

GB/T 39348-2020 (Space data and information transfer systems - TM (telemetry)synchronization and channel coding) is available as an English-translated PDF.

GB/T 39348-2020 — This standard specifies convolutional codes, RS codes, Turbo codes, and convolutional codes involved in telemetry synchronization and channel coding in spatial data and information transmission systems. Technical requirements for LDPC codes, interleaving, and pseudo-randomization. This standard applies to the interface design of air-to-ground links and channel coding between air-to-air links. Can be combined with GB/T 39351 or Use with GB/T 39345.

Document preview — GB/T 39348-2020

National Standard of the People's Republic of China

ICS: 49.140
Classification: V 75

Issued by: State Administration for Market Regulation, China National Standardization Administration

1 Scope1
2 Normative references1
3 Terms and definitions, abbreviations1
3.1 Terms and definitions1
3.2 Abbreviations2
4 General3
4.1 Architecture3
4.2 Function Introduction4
4.3 Internal organization of sub-layers4
5 Convolutional code6
5.1 Overview6
5.2 General requirements6
5.3 Basic convolutional codes7
5.4 Punctured convolutional codes8
6 RS code (Reed-Solomon code)9
6.1 Overview9
6.2 General requirements9
6.3 Characteristics of RS code9
6.4 Symbol interleaving13
7 Cascade code13
7.1 The combination of cascade13
7.2 Inner code and outer code13
7.3 Block diagram of cascaded channel coding system13
8 Turbo Code14
8.1 Overview14
8.2 General requirements14
8.3 Features of Standard Turbo Code14
8.4 Synchronization identification18
9 LDPC code transmission frame18
9.1 Overview18
9.2 General requirements19
9.3 LDPC code with coding rate of 223/25519
9.4 LDPC code clusters with coding rates of 1/2, 2/3 and 4/522
9.5 Synchronization identification25
10 Frame synchronization25
10.1 Overview25
10.2 Additional Synchronization Mark (ASM)26
10.3 Bit pattern of ASM26
10.4 Location of ASM28
10.5 The relationship between ASM and RS, Turbo and LDPC code blocks and code words28
10.6 ASM embedded in the data stream28
11 Pseudo-randomization28
11.1 Overview28
11.2 Description of pseudo-randomization28
11.3 Synchronization and application of pseudo-randomization29
11.4 Pseudo-random sequence29
12 Transmission frame length29
13 Management parameters30
13.1 Overview30
13.2 Encoding selection30
13.3 Parameter setting31
Appendix A (informative appendix) The structural changes of this standard compared with ISO 22641.201232
Appendix B (informative appendix) Technical differences between this standard and ISO 22641.2012 and their reasons34
Appendix C (Normative Appendix) Service Definition36
Appendix D (informative appendix) RS code generator polynomial coefficient expansion38
Appendix E (informative appendix) Conversion between Berlekamp representation and conventional representation39
Appendix F (informative appendix) 223/255 ratio LDPC code45
Appendix G (Informative Appendix) Cyclic Redundancy (CRC) Error Detection Code Application47
Figure 1 The relationship between TM synchronization and channel coding and OSI layer3
Figure 2 The internal process of the synchronization and coding sublayer at the transmitter5
Figure 3 The internal flow of synchronization and coding sublayer at the receiving end6
Figure 4 Schematic diagram of convolutional encoder7
Figure 5 Principle diagram of punctured encoder8
Figure 6 RS code block structure11
Figure 7 Block diagram of RS interleaving coding13
Figure 8 Block diagram of the cascaded channel coding system14
Figure 9 Block diagram of Turbo encoder16

Foreword

This standard was drafted in accordance with the rules given in GB/T 1.1-2009.

This standard uses the redrafting method to modify and adopt ISO 22641.2012 "Space Data and Information Transmission System Telemetry Synchronization and Channel

coding".

Compared with ISO 22641.2012, this standard has many structural adjustments. Appendix A lists this standard and ISO 22641.2012

The chapter number comparison list.

Compared with ISO 22641.2012, this standard has technical differences, and the clauses related to these differences have been

The set vertical single line (|) is marked, and a list of the corresponding technical differences and their reasons is given in Appendix B.

This standard also made the following editorial changes.

---Deleted part of the references to the principle definition document structure in Chapter 1 of ISO 22641.2012;

--- Changed Appendix A "Abbreviations" in ISO 22641.2012 to Chapter 4 of the main text;

--- Deleted the informative appendix B of ISO 22641.2012 "Security, space allocation numbers and patent factors";

---The informative appendix E "References" of ISO 22641.2012 is deleted.

This standard was proposed and managed by the National Aerospace Technology and Application Standardization Technical Committee (SAC/TC425).

Drafting organizations of this standard. China Aerospace Standardization Institute, Beijing Space Vehicle General Design Department, Beijing University of Aeronautics and Astronautics, Beijing Yao

Institute of Measurement Technology, Xi'an Institute of Space Radio Technology, Aerospace Dongfanghong Satellite Co., Ltd.

1 Scope

This standard specifies convolutional codes, RS codes, Turbo codes, and convolutional codes involved in telemetry synchronization and channel coding in spatial data and information transmission systems.

Technical requirements for LDPC codes, interleaving, and pseudo-randomization.

This standard applies to the interface design of air-to-ground links and channel coding between air-to-air links. Can be combined with GB/T 39351 or

Use with GB/T 39345.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this document.

For undated references, the latest version (including all amendments) applies to this document.

GB/T 2900.54 Electrotechnical terminology radio communication. transmitter, receiver, network and operation (GB/T 2900.54-2002, IEC 60050-713.1998, IDT)

GB/T 39345 Space Data and Information Transmission System Advanced On-orbit System Space Data Link Protocol (GB/T 39345-2020, ISO 22666.2016, MOD)

GB/T 39349 Spatial data and information transmission system remote synchronization and channel coding (GB/T 39349-2020, ISO 22642.2015, MOD)

GB/T 39351 Spatial Data and Information Transmission System Telemetry Spatial Data Link Protocol (GB/T 39351-2020, ISO 22645.2016, MOD)

3 Terms and definitions, abbreviations

3.1 Terms and definitions

The following terms and definitions defined in GB/T 2900.54 apply to this document.

3.1.1

symbol

The basic data unit for transformation and processing, and its specific meaning varies depending on the application.

a) For standard convolutional codes, a symbol refers to a binary code point;

b) For the RS code, the symbol refers to the element in the finite field GF(2J). At this time, each symbol is composed of J bits.

3.1.2

numbers

A sequence of n symbols generated by an (n, k) code encoder encoding k input information symbols.

Note. This output sequence will be processed as a whole during decoding.

3.1.3

Code block

Used for RS codes, a collection of I codewords, where I is the interleaving depth. When I is 1, "code block" and "code word" are equivalent.

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — all pages — is available in the English PDF.

Referenced standards

Normative references

GB/T 2900.54 · GB/T 2900.54-2002 · IEC 60050 · ISO 22666.2016 · GB/T 39349 · GB/T 39349-2020 · ISO 22642.2015 · ISO 22645.2016

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