Praise for Fundamentals of WiMAX

284 Chapter 8 • PHY Layer of WiMAXTable 8.4 Uplink and Downlink Burst Profiles in IEEE 802.16e-2005Format Format Format Format0 QPSK CC a 1/2 14 Reserved 28 64 QAM ZCC 3/4 42 64 QAM LDPC 2/31 QPSK CC 3/4 15 QPSK CTC b 3/4 29 QPSK LDPC 1/2 43 64 QAM LDPC 3/42 16 QAM CC 1/2 16 16 QAM CTC 1/2 30 QPSK LDPC 2/3 44 c QPSK CC 1/23 16 QAM CC 3/4 17 16 QAM CTC 3/4 31 QPSK LDPC 3/4 45 c QPSK CC 3/44 64 QAM CC 1/2 18 64 QAM CTC 1/2 32 16 QAM LDPC 1/2 46 c 16 QAM CC 1/25 64 QAM CC 2/3 19 64 QAM CTC 2/3 33 16 QAM LDPC 2/3 47 c 16 QAM CC 3/46 64 QAM CC 3/4 20 64 QAM CTC 3/4 34 16 QAM LDPC 3/4 48 c 64 QAM CC 2/37 QPSK BTC d 1/2 21 64 QAM CTC 5/6 35 64 QAM LDPC 1/2 49 c 64 QAM CC 3/48 QPSK BTC 3/4 22 QPSK ZCC e 1/2 36 64 QAM LDPC 2/3 50 QPSK LDPC 5/6910111216 QAM BTC3/516 QAM BTC4/564 QAM BTC5/864 QAM BTC4/523 QPSK ZCC 3/4 37 64 QAM LDPC 3/4 51 16 QAM LDPC 5/624 16 QAM ZCC 1/2 38 f QPSK LDPC 2/3 52 64 QAM LDPC 5/625 16 QAM ZCC 3/4 39 f QPSK LDPC 3/4 > 52 reserved26 64 QAM ZCC 1/2 40 f 16 QAM LDPC 2/313 QPSK CTC 1/2 27 64 QAM ZCC 2/3 41 f 16 QAM LDPC 3/4a. Convolutional codeb. Convolutional turbo codec. 44–49 use the optional interleaver with the convolutional codesd. Block turbo codese. Zero-terminating convolutional code, which uses a padding byte of 0 x 00 instead of tailbitingf. 38–43 use the B code for LDPC; other burst profiles with LDPC use A codethen the remainder of the subcarriers are mapped onto the various subchannels, using a permutationscheme [3, 4]. The set of the pilot subcarriers is divided in to two constant sets and two variablessets. The index of the pilot subcarriers belonging to the variable sets changes from oneOFDM symbol to the next, whereas the index of the pilot subcarriers belonging to the constantsets remains unchanged. The variable sets allow the receiver to estimate the channel responsemore accurately across the entire frequency band, which is especially important in channels with