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-----Original Message-----
From: Chao_Ming Chang [mailto:Lepidus_Chang@MTK.COM.TW]
Sent: Friday, June 02, 2006 7:25 AM
To: STDS-802-16@listserv.ieee.org
Subject: [STDS-802-16] [STDS-802.16][PREAMBLE]
Hello all,
This is Chao-Ming Chang from MediaTek Inc.
By going through the IEEE 802.16e/D12, it is found
that when the Mobile Subsriber Station (MSS) turned on
near a base station (BS), the received preamble would be
like three quasi-repetitive short symbols. This is mainly because
the preamble structure transmits signals every three sub-carriers.
This repetition property was extensively discussed on this reflectors
around August 2004.
However, when the MSS turned on at a similar distance to
three BSs using three different segment preambles, the received
preamble would lose its quasi-repetition property because every
sub-carriers are non-zero (except the DC carrier and the guard band
carriers). Without this repetition property, the initial frame
synchronization would only rely on the cyclic prefix (CP) in every
observed OFDM symbols in a frame to decide a symbol boundary.
And then detect the PN squence with unknown channel impulse response,
frequency offset (there might have integer-part frequency offset)
over 114 possible sequences. This would really drain the power of
the MS.
By reading the discussions on the reflectors, unfortunately,
I did not find the discussion on this issue. Has this issue been
discussed? Any comments are truely appreciated. Thanks a bunch.
Best regards,
Chao-Ming.
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