If STBC is applied, the stream of complex numbers, , generated by the constellation mapper, is the input of the STBC encoder, which produces as output the stream of complex numbers . For given values of k STBC processing operates on the complex modulation symbols in sequential pairs of OFDM and i, symbols so that the value of depends on and and also depends on and , as defined in Table 2216. --Constellation mapper output to spatial mapper input for STBC NSTS NSS iSTS 1 2 1 2 1 2 4 2 3 4 1 2 3 6 3 4 5 6 1 2 3 4 8 4 5 6 7 8 If STBC is not applied, and . NOTE--When STBC is applied, an odd number of space time streams per user is not allowed, and . Pilot subcarriers For a 20 MHz transmission, four pilot tones shall be inserted in subcarriers 7, and 21. The pilot –21, –7, mapping for subcarrier for symbol shall be as follows k n where is given by the 1 row of Table 20-18 of Clause 20. NSTS = For a 40 MHz transmission, six pilot tones shall be inserted in subcarriers 11, 25, and 53. –53, –25, –11, The pilot mapping for subcarrier for symbol shall be as follows k n where is given by the 1 row of Table 20-19 of Clause 20. NSTS = For an 80 MHz transmission, pilot tones shall be inserted in subcarriers 11, 39, –103, –75, –39, –11, 75, and 103. The pilot mapping for subcarrier for symbol shall be as follows k n where is defined in Table 2217. 2217 Pilot values for 80 MHz transmission – 0 1 2 3 4 5 6 7 1 1 1 -1 -1 1 1 1
If STBC is applied, the stream of complex numbers, , generated by the constellation mapper, is the input of the STBC encoder, which produces as output the stream of complex numbers . For given values of k and i, STBC processing operates on the complex modulation symbols in sequential pairs of OFDM symbols so that the value of depends on and and also depends on and , as defined in Table 2216. --Constellation mapper output to spatial mapper input for STBC NSTS NSS iSTS 2 1 1 2 4 2 1 2 3 4 6 3 1 2 3 4 5 6 8 4 1 2 3 4 5 6 7 8 If STBC is not applied, and . NOTE--When STBC is applied, an odd number of space time streams per user is not allowed, and . Pilot subcarriers For a 20 MHz transmission, four pilot tones shall be inserted in subcarriers –21, –7, 7, and 21. The pilot mapping for subcarrier k for symbol n shall be as follows where is given by the NSTS = 1 row of Table 20-18 of Clause 20. For a 40 MHz transmission, six pilot tones shall be inserted in subcarriers –53, –25, –11, 11, 25, and 53. The pilot mapping for subcarrier k for symbol n shall be as follows where is given by the NSTS = 1 row of Table 20-19 of Clause 20. For an 80 MHz transmission, pilot tones shall be inserted in subcarriers –103, –75, –39, –11, 11, 39, 75, and 103. The pilot mapping for subcarrier k for symbol n shall be as follows where is defined in Table 2217. 2217 – Pilot values for 80 MHz transmission 0 1 2 3 4 5 6 7 1 1 1 -1 -1 1 1 1
11-10-1361-03-00ac-proposed-tgac-draft-amendment.docx