Short guard interval (transmit and receive) — A TVHT STA may optionally support: TVHT_MODE_2C, TVHT_MODE_2N, TVHT_MODE_4C, or TVHT_MODE_4N (Two or four — frequency segments) Two or more spatial streams (transmit and receive) — Beamforming sounding (by sending a VHT NDP frame) — Respond to transmit beamforming sounding (provide compressed beamforming feedback) — STBC (transmit and receive) — LDPC (transmit and receive) — MU (transmit and receive) — MCSs 8 and 9 (transmit and receive) — The tone spacing, DFT duration and the other timing parameters remain unchanged for all optional modes compared with the mandatory mode (one segment). The DATA encoding process for transmissions is similar to one segment transmission. TVHT supports following formats Non-HT format (NON_HT). (NON_HT_DUP_OFDM only) TVHT format (TVHT). Support for TVHT format is mandatory. TVHT supports 1 to 4 single user space-time streams and up to four user multi user transmission. The following table summarises timing related parameters and tone location. Parameter 6 MHz 7 MHz 8 MHz Description Number of complex data 108 108 108 numbers per NSD frequency segment Number of pilot values per 6 6 6 NSP frequency segment Total number of subcarriers per 114 114 114 NST frequency segment Highest data subcarrier index 58 58 58 NSR per frequency segment Subcarrier frequency ∆F spacing IDFT/DFT 24 µs 24 µs 18 µs TDFT period
— Short guard interval (transmit and receive) A TVHT STA may optionally support: — TVHT_MODE_2C, TVHT_MODE_2N, TVHT_MODE_4C, or TVHT_MODE_4N (Two or four frequency segments) — Two or more spatial streams (transmit and receive) — Beamforming sounding (by sending a VHT NDP frame) — Respond to transmit beamforming sounding (provide compressed beamforming feedback) — STBC (transmit and receive) — LDPC (transmit and receive) — MU (transmit and receive) — MCSs 8 and 9 (transmit and receive) The tone spacing, DFT duration and the other timing parameters remain unchanged for all optional modes compared with the mandatory mode (one segment). The DATA encoding process for transmissions is similar to one segment transmission. TVHT supports following formats Non-HT format (NON_HT). (NON_HT_DUP_OFDM only) TVHT format (TVHT). Support for TVHT format is mandatory. TVHT supports 1 to 4 single user space-time streams and up to four user multi user transmission. The following table summarises timing related parameters and tone location. Parameter 6 MHz 7 MHz 8 MHz Description NSD 108 108 108 Number of complex data numbers per frequency segment NSP 6 6 6 Number of pilot values per frequency segment NST 114 114 114 Total number of subcarriers per frequency segment NSR 58 58 58 Highest data subcarrier index per frequency segment ∆F Subcarrier frequency spacing TDFT 24 µs 24 µs 18 µs IDFT/DFT period
11-12-0809-05-00af-tgaf-phy-proposal.docx