Bits: 3 3 2 2 1 1 3 1 2 6 MIMO Control field The subfields of the VHT MIMO Control field are defined in Subfields of the VHT MIMO Control field . Subfields of the VHT MIMO Control field Subfield Description Nc Indicates the number of columns, in the compressed Nc, beamforming feedback matrix minus one: Set to 0 for = 1 Nc Set to 1 for = 2 Nc … Set to 7 for = 8 Nc Nr Indicates the number of rows, in the compressed beamforming Nr, feedback matrix one: Set to 0 for = 1 Nr Set to 1 for = 2 Nr … Set to 7 for = 8 Nr Channel Width Indicates the width of the channel in which the measurement to create the compressed beamforming feedback matrix was made: Set to 0 for 20 MHz Set to 1 for 40 MHz Set to 2 for 80 MHz Set to 3 for 160 MHz or 80+80 MHz Grouping Indicates the subcarrier grouping, used for the compressed Ng, beamforming feedback matrix: Set to 0 for = 1 (No grouping) Ng Set to 1 for = 2 Ng Set to 2 for = 4 Ng The value 3 is reserved Codebook Indicates the size of codebook entries: Information If Feedback Type is SU: Set to 0 for 2 bits for 4 bits for  ψ, Set to 1 for 4 bits for 6 bits for  ψ, If Feedback Type is MU: Set to 0 for 5 bits for 7 bits for  ψ, Set to 1 for 7 bits for 9 bits for  ψ, Feedback Type Indicates the feedback type: Set to 0 for SU Set to 1 for MU
Bits: 3 3 2 2 1 1 3 1 2 6 MIMO Control field The subfields of the VHT MIMO Control field are defined in Subfields of the VHT MIMO Control field . Subfields of the VHT MIMO Control field Subfield Description Nc Indicates the number of columns, Nc, in the compressed beamforming feedback matrix minus one: Set to 0 for Nc = 1 Set to 1 for Nc = 2 … Set to 7 for Nc = 8 Nr Indicates the number of rows, Nr, in the compressed beamforming feedback matrix one: Set to 0 for Nr = 1 Set to 1 for Nr = 2 … Set to 7 for Nr = 8 Channel Width Indicates the width of the channel in which the measurement to create the compressed beamforming feedback matrix was made: Set to 0 for 20 MHz Set to 1 for 40 MHz Set to 2 for 80 MHz Set to 3 for 160 MHz or 80+80 MHz Grouping Indicates the subcarrier grouping, Ng, used for the compressed beamforming feedback matrix: Set to 0 for Ng = 1 (No grouping) Set to 1 for Ng = 2 Set to 2 for Ng = 4 The value 3 is reserved Codebook Information Indicates the size of codebook entries: If Feedback Type is SU: Set to 0 for 2 bits for ψ, 4 bits for  Set to 1 for 4 bits for ψ, 6 bits for  If Feedback Type is MU: Set to 0 for 5 bits for ψ, 7 bits for  Set to 1 for 7 bits for ψ, 9 bits for  Feedback Type Indicates the feedback type: Set to 0 for SU Set to 1 for MU
11-12-1037-00-00ac-lb188-d3-0-resolution-for-regulatory-generalisation.docx