ETSI
Contents
Intellectual Property Rights ................................................................................................................................ 5
Foreword ............................................................................................................................................................. 5
Modal verbs terminology .................................................................................................................................... 5
Introduction ........................................................................................................................................................ 5
1 Scope ........................................................................................................................................................ 6
2 References ................................................................................................................................................ 6
2.1 Normative references ......................................................................................................................................... 6
2.2 Informative references ........................................................................................................................................ 6
3 Symbols and abbreviations ....................................................................................................................... 7
3.1 Symbols .............................................................................................................................................................. 7
3.2 Abbreviations ..................................................................................................................................................... 7
4 Overview of physical layer ....................................................................................................................... 7
5 Forward bearers ........................................................................................................................................ 8
5.1 Introduction ........................................................................................................................................................ 8
5.1.1 Forward bearer types .................................................................................................................................... 8
5.1.2 L-Band Forward Frequency Range ............................................................................................................... 9
5.2 Modulation ....................................................................................................................................................... 10
5.2.1 Symbol rate ................................................................................................................................................. 10
5.2.2 Modulation schemes ................................................................................................................................... 11
5.2.2.1 16-QAM (X/X16) bearers ..................................................................................................................... 11
5.2.2.2 32-QAM (X32) bearers ......................................................................................................................... 11
5.2.2.3 64-QAM (X64) bearers ......................................................................................................................... 13
5.2.2.4 QPSK (Q/X4) bearers ........................................................................................................................... 15
5.2.2.5 Dynamic Modulation ............................................................................................................................ 16
5.2.3 Channel filtering ......................................................................................................................................... 16
5.3 Bearer types and frame formats ........................................................................................................................ 20
5.3.1 Frame numbering ........................................................................................................................................ 20
5.3.2 Forward bearer parameters ......................................................................................................................... 20
5.3.3 Forward channel frame formats .................................................................................................................. 21
5.3.4 Unique words .............................................................................................................................................. 22
5.3.4.0 General .................................................................................................................................................. 22
5.3.4.1 QPSK (Q) bearers ................................................................................................................................. 22
5.3.4.2 X (F80T1X, F80T4.5X) Bearers ........................................................................................................... 23
5.3.4.3 X4/16 (FR80T2.5X4/16-5B, FR80T5X4/16-9B) Bearers ..................................................................... 23
5.3.4.4 X16 (FR80T2.5X16-5B, FR80T5X16-9B) Bearers .............................................................................. 24
5.3.4.5 X32 (FR80T2.5X32-6B, FR80T5X32-11B) Bearers ............................................................................ 25
5.3.4.6 X64 (FR80T2.5X64-7B, FR80T5X64-13B) Bearers ............................................................................ 26
5.3.5 Pilot symbols .............................................................................................................................................. 26
5.3.6 Empty block data ........................................................................................................................................ 27
5.3.7 Scrambling .................................................................................................................................................. 27
5.3.8 Coding ........................................................................................................................................................ 27
5.3.8.0 General .................................................................................................................................................. 27
5.3.8.1 Turbo coding ......................................................................................................................................... 27
5.3.8.2 SRCC encoder ....................................................................................................................................... 28
5.3.8.3 S-Interleaver .......................................................................................................................................... 29
5.3.8.4 Puncturing, Channel Interleaving and Symbol Mapping ...................................................................... 29
5.3.8.5 80ms Outer Interleaver .......................................................................................................................... 29
5.4 PDU formats ..................................................................................................................................................... 30
6 Return bearers ........................................................................................................................................ 31
6.1 Introduction ...................................................................................................................................................... 31
6.1.1 Return bearer types ..................................................................................................................................... 31
6.1.2 L-Band Return Frequency Range ............................................................................................................... 33
6.2 Modulation ....................................................................................................................................................... 34
