Content for TS 36.211 Word version: 18.0.1
6 Downlink
6.1 Overview
6.2 Slot structure and physical resource elements
6.3 General structure for downlink physical channels
6.3.1 Scrambling
6.3.2 Modulation
6.3.3 Layer mapping
6.3.4 Precoding
6.3.5 Mapping to resource elements
6.4 Physical downlink shared channel
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6 Downlink p. 98
6.1 Overview p. 98
6.1.1 Physical channels p. 98
6.1.2 Physical signals p. 98
6.2 Slot structure and physical resource elements p. 99
6.2.1 Resource grid p. 99
6.2.2 Resource elements p. 100
6.2.3 Resource blocks p. 101
6.2.3.1 Virtual resource blocks of localized type p. 102
6.2.3.2 Virtual resource blocks of distributed type p. 102
6.2.4 Resource-element groups (REGs) p. 103
6.2.4A Enhanced Resource-Element Groups (EREGs) p. 104
6.2.4B Short Resource-Element Groups (SREGs) p. 104
6.2.5 Guard period for half-duplex FDD operation p. 104
6.2.6 Guard Period for TDD Operation p. 105
6.2.7 Narrowbands and widebands p. 105
6.2.8 Guard period for narrowband and wideband retuning p. 106
6.3 General structure for downlink physical channels p. 106
6.3.1 Scrambling p. 107
6.3.2 Modulation p. 108
6.3.3 Layer mapping p. 108
6.3.3.1 Layer mapping for transmission on a single antenna port p. 108
6.3.3.2 Layer mapping for spatial multiplexing p. 109
6.3.3.3 Layer mapping for transmit diversity p. 110
6.3.4 Precoding p. 110
6.3.4.1 Precoding for transmission on a single antenna port p. 110
6.3.4.2 Precoding for spatial multiplexing using antenna ports with cell-specific reference signals p. 111
6.3.4.2.1 Precoding without CDD p. 111
6.3.4.2.2 Precoding for large delay CDD p. 111
6.3.4.2.3 Codebook for precoding and CSI reporting p. 112
6.3.4.3 Precoding for transmit diversity p. 113
6.3.4.4 Precoding for spatial multiplexing using antenna ports with UE-specific reference signals p. 114
6.3.5 Mapping to resource elements p. 115
6.4 Physical downlink shared channel p. 116
