LTE物理层标准-Physical Channels and Modulation

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LTE物理层标准-Physical Channels and Modulation
Contents
Foreword ...........................................................................................................................................................6
1 Scope ......................................................................................................................................................7
2 References ...............................................................................................................................................7
3 Definitions, symbols and abbreviations ...................................................................................................7
3.1 Symbols ............................................................................................................................................................ 7
3.2 Abbreviations.................................................................................................................................................... 9
4 Frame structure........................................................................................................................................9
4.1 Frame structure type 1 ...................................................................................................................................... 9
4.2 Frame structure type 2 .................................................................................................................................... 10
5 Uplink....................................................................................................................................................11
5.1 Overview......................................................................................................................................................... 11
5.1.1 Physical channels ...................................................................................................................................... 11
5.1.2 Physical signals ......................................................................................................................................... 11
5.2 Slot structure and physical resources............................................................................................................... 12
5.2.1 Resource grid ............................................................................................................................................ 12
5.2.2 Resource elements..................................................................................................................................... 13
5.2.3 Resource blocks ........................................................................................................................................ 13
5.3 Physical uplink shared channel........................................................................................................................ 13
5.3.1 Scrambling ................................................................................................................................................ 14
5.3.2 Modulation ................................................................................................................................................ 14
5.3.3 Transform precoding................................................................................................................................. 14
5.3.4 Mapping to physical resources................................................................................................................... 15
5.4 Physical uplink control channel ....................................................................................................................... 16
5.4.1 PUCCH formats 1, 1a and 1b..................................................................................................................... 16
5.4.2 PUCCH formats 2, 2a and 2b..................................................................................................................... 19
5.4.3 Mapping to physical resources................................................................................................................... 20
5.5 Reference signals ............................................................................................................................................ 21
5.5.1 Generation of the reference signal sequence .............................................................................................. 21
5.5.1.1 Base sequences of length RB
3Nsc or larger............................................................................................ 21
5.5.1.2 Base sequences of length less than RB
3Nsc ........................................................................................... 22
5.5.1.3 Group hopping..................................................................................................................................... 23
5.5.1.4 Sequence hopping................................................................................................................................ 24
5.5.2 Demodulation reference signal................................................................................................................... 24
5.5.2.1 Demodulation reference signal for PUSCH.......................................................................................... 24
5.5.2.1.1 Reference signal sequence .............................................................................................................. 24
5.5.2.1.2 Mapping to physical resources........................................................................................................ 25
5.5.2.2 Demodulation reference signal for PUCCH......................................................................................... 25
5.5.2.2.1 Reference signal sequence .............................................................................................................. 25
5.5.2.2.2 Mapping to physical resources........................................................................................................ 26
5.5.3 Sounding reference signal .......................................................................................................................... 27
5.5.3.1 Sequence generation............................................................................................................................ 27
5.5.3.2 Mapping to physical resources ............................................................................................................. 27
5.5.3.3 Sounding reference signal subframe configuration .............................................................................. 29
5.6 SC-FDMA baseband signal generation............................................................................................................ 30
5.7 Physical random access channel ...................................................................................................................... 31
5.7.1 Time and frequency structure..................................................................................................................... 31
5.7.2 Preamble sequence generation ................................................................................................................... 37
5.7.3 Baseband signal generation....................................................................................................................... 40
5.8 Modulation and upconversion......................................................................................................................... 40
6 Downlink...............................................................................................................................................41
6.1 Overview......................................................................................................................................................... 41
6.1.1 Physical channels ...................................................................................................................................... 41
3GPP
3GPP TS Release 8 4 36.211 V8.4.0 (2008-09)
6.1.2 Physical signals ......................................................................................................................................... 41
6.2 Slot structure and physical resource elements ................................................................................................. 42
6.2.1 Resource grid ............................................................................................................................................ 42
6.2.2 Resource elements..................................................................................................................................... 42
6.2.3 Resource blocks ........................................................................................................................................ 43
6.2.3.1 Virtual resource blocks of localized type ............................................................................................. 44
6.2.3.2 Virtual resource blocks of distributed type........................................................................................... 44
6.2.4 Resource-element groups ........................................................................................................................... 45
6.2.5 Guard period for half-duplex FDD operation............................................................................................. 46
6.2.6 Guard Period for TDD Operation............................................................................................................... 46
6.3 General structure for downlink physical channels ........................................................................................... 46
6.3.1 Scrambling ................................................................................................................................................ 47
6.3.2 Modulation ................................................................................................................................................ 47
6.3.3 Layer mapping .......................................................................................................................................... 47
6.3.3.1 Layer mapping for transmission on a single antenna port .................................................................... 47
6.3.3.2 Layer mapping for spatial multiplexing ............................................................................................... 47
6.3.3.3 Layer mapping for transmit diversity ................................................................................................... 48
6.3.4 Precoding .................................................................................................................................................. 48
6.3.4.1 Precoding for transmission on a single antenna port ............................................................................ 48
6.3.4.2 Precoding for spatial multiplexing........................................................................................................ 49
6.3.4.2.1 Precoding without CDD.................................................................................................................. 49
6.3.4.2.2 Precoding for large delay CDD....................................................................................................... 49
6.3.4.2.3 Codebook for precoding ................................................................................................................. 50
6.3.4.3 Precoding for transmit diversity ........................................................................................................... 51
6.3.5 Mapping to resource elements.................................................................................................................... 52
6.4 Physical downlink shared channel ................................................................................................................... 52
6.5 Physical multicast channel.............................................................................................................................. 52
6.6 Physical broadcast channel .............................................................................................................................. 53
6.6.1 Scrambling ................................................................................................................................................ 53
6.6.2 Modulation ................................................................................................................................................ 53
6.6.3 Layer mapping and precoding.................................................................................................................... 53
6.6.4 Mapping to resource elements.................................................................................................................... 53
6.7 Physical control format indicator channel ....................................................................................................... 54
6.7.1 Scrambling ................................................................................................................................................ 54
6.7.2 Modulation ................................................................................................................................................ 54
6.7.3 Layer mapping and precoding.................................................................................................................... 54
6.7.4 Mapping to resource elements.................................................................................................................... 55
6.8 Physical downlink control channel .................................................................................................................. 55
6.8.1 PDCCH formats ........................................................................................................................................ 55
6.8.2 PDCCH multiplexing and scrambling........................................................................................................ 55
6.8.3 Modulation ................................................................................................................................................ 56
6.8.4 Layer mapping and precoding.................................................................................................................... 56
6.8.5 Mapping to resource elements.................................................................................................................... 56
6.9 Physical hybrid ARQ indicator channel........................................................................................................... 57
6.9.1 Modulation ................................................................................................................................................ 58
6.9.2 Resource group alignment, layer mapping and precoding ......................................................................... 58
6.9.3 Mapping to resource elements.................................................................................................................... 60
6.10 Reference signals ............................................................................................................................................ 61
6.10.1 Cell-specific reference signals ................................................................................................................... 62
6.10.1.1 Sequence generation............................................................................................................................ 62
6.10.1.2 Mapping to resource elements .............................................................................................................. 62
6.10.2 MBSFN reference signals .......................................................................................................................... 64
6.10.2.1 Sequence generation............................................................................................................................ 64
6.10.2.2 Mapping to resource elements .............................................................................................................. 64
6.10.3 UE-specific reference signals..................................................................................................................... 66
6.10.3.1 Sequence generation............................................................................................................................ 66
6.10.3.2 Mapping to resource elements .............................................................................................................. 67
6.11 Synchronization signals .................................................................................................................................. 68
6.11.1 Primary synchronization signal.................................................................................................................. 69
6.11.1.1 Sequence generation............................................................................................................................ 69
6.11.1.2 Mapping to resource elements .............................................................................................................. 69
6.11.2 Secondary synchronization signal.............................................................................................................. 69
3GPP
3GPP TS Release 8 5 36.211 V8.4.0 (2008-09)
6.11.2.1 Sequence generation............................................................................................................................ 69
6.11.2.2 Mapping to resource elements .............................................................................................................. 71
6.12 OFDM baseband signal generation.................................................................................................................. 72
6.13 Modulation and upconversion......................................................................................................................... 72
7 Generic functions ..................................................................................................................................73
7.1 Modulation mapper......................................................................................................................................... 73
7.1.1 BPSK .............................................................................................................................................................. 73
7.1.2 QPSK.............................................................................................................................................................. 73
7.1.3 16QAM........................................................................................................................................................... 74
7.1.4 64QAM........................................................................................................................................................... 74
7.2 Pseudo-random sequence generation ............................................................................................................... 75
8 Timing...................................................................................................................................................76
8.1 Uplink-downlink frame timing ........................................................................................................................ 76
Annex A (informative): Change history ...............................................................................................77
 

xunhaien

正在找这个，谢谢啊