| 主权项 |
1. A method, comprising:
selecting, at a communication device, a number of spatial streams NSS; selecting, at the communication device, a channel bandwidth; selecting, at the communication device, a modulation coding scheme (MCS) from i) a first set of MCSs when the selected channel bandwidth is a first channel bandwidth, or ii) a second set of MCSs when the selected channel bandwidth is a second channel bandwidth, wherein the first set of MCSs is different than the second set of MCSs, and the second set of MCSs excludes MCSs from the first set of MCSs that will result in a padding-related constraint not being met when the second channel bandwidth is to be used; encoding, at the communication device, information bits according to the selected MCS; after encoding, parsing, at the communication device, the information bits into NSS spatial streams; after parsing, interleaving, at the communication device, the information bits in each spatial stream, including
entering the information bits into a matrix having an integer number of rows equal to NROW and an integer number of columns equal to NCOL,reading the information bits out from the matrix in the NCOL columns, andapplying a frequency rotation r according to
r=(j−f*NROTNBPSCS(iSS))mod NCBPSS(iSS)where iSS is a spatial stream index from 1, 2, . . . NSS, NCBPSS(iSS) is a number of coded bits per symbol for an iSSth spatial stream, NBPSCS(iSS) is a number of coded bits per carrier for the iSSth spatial stream, j=0, 1, . . . , NCBPSS(iSS)−1, f is an integer that varies based on the spatial stream index iSS, and NROT is an interleaving parameter; after interleaving, modulating, at the communication device, the information bits according to the selected MCS; and generating, at the communication device, a plurality of Orthogonal Frequency Division Multiplexing (OFDM) symbols using the modulated information bits. |
