[STDS-802-16-MOBILE] the difference between FUSC and PUSC in downlink

[Ming Ren <mingren@GMAIL.COM>]

Dear All,

I have a question on subcarrier allocations of 802.16e OFDMA PHY layer.
According to 802.16-2004 cor1/D5(8.4.6 OFDMA subcarrier
allocations,P.159), it is said that "For OFDMA, . Subtracting the
guard tones from NFFT, one obtains the set of "used" subcarriers
Nused. For both uplink and downlink, these used subcarriers are
allocated to pilot subcarriers and data subcarriers. However, there is
a difference between the different possible zones. For FUSC and PUSC,
in the downlink, the pilot tones are allocated first; what remains are
data subcarriers, which are divided into subchannels that are used
exclusively for data. For PUSC in the downlink or in the uplink, the
set of used subcarriers is first partitioned into subchannels, and
then the pilot subcarriers are allocated from within each subchannel.
Thus, in FUSC, there is one set of common pilot subcarriers, and in
PUSC of the downlink, there is one set of common pilot subcarriers in
each major group, but in PUSC of the uplink, each subchannel contains
its own set of pilot subcarriers."
Is "Thus, in FUSC, there is one set of common pilot subcarriers, and
in PUSC of the downlink, there is one set of common pilot subcarriers
in each major group" the only difference between FUSC and PUSC in the
downlink?
Your reply will be highly appreciated!

Best Regards

Ming Ren