At receiver 105, the sequence of HE-LTF symbols is mapped using the ith column of P_16×16 as depicted (i.e., the ith column has dimensions of 16×4) is received after the ith group of groups 211-214 (e.g., 1^st group is group 211). After receiving group 211 of HE-LTF symbols, preamble processing 106 applies a Hermitian of the 4×4 P-matrix, as defined in the standard, to the HE-LTF symbols transmitted within group 211 after removing their polarity. This application is the undo P of calculation 221. The resulting matrix is representative of the channel estimate for streams 4x+1 (e.g., the 1^st, 5^th, 9^th, and 13^th streams) where x=1, 2, 3, and 4 corresponding to users 1-4 having the (4x+1)th stream allocated to them, respectively. After receiving group 212 of HE-LTF symbols, preamble processing 106 applies the Hermitian of the 4×4 P-matrix to the HE-LTF symbols transmitted within group 212 after removing their polarity. This application is the undo P of calculation 222. The resulting matrix is representative of the channel estimate for streams 4x+2 (e.g., the 2^nd, 6^th, 10^th, and 14^th streams) where x=1, 2, 3, and 4 corresponding to users 1-4 having the (4x+2)th stream allocated to them, respectively. After receiving group 213 of HE-LTF symbols, preamble processing 106 applies the Hermitian of the 4×4 P-matrix to the HE-LTF symbols transmitted within group 213 after removing their polarity. This application is the undo P of calculation 223. The resulting matrix is representative of the channel estimate for streams 4x+3 (e.g., the 3^rd, 7^th, 11^th, and 15^th streams) where x=1, 2, 3, and 4 corresponding to users 1-4 having the (4x+3)th stream allocated to them, respectively. After receiving group 214 of HE-LTF symbols, preamble processing 106 applies the Hermitian of the 4×4 P-matrix to the HE-LTF symbols transmitted within group 214 after removing their polarity. This application is the undo P of calculation 224. The resulting matrix is representative of the channel estimate for streams 4x+4 (e.g., the 4^th, 8^th, 12^th, and 16^th streams) where x=1, 2, 3, and 4 corresponding to users 1-4 having the (4x+4)th stream allocated to them, respectively.