Re: [STDS-802-16] Pilot subcarrier transmission in OFDMA
Dear Stinsen:
Since the subcarriers index are not contiguous in the subchannels of a zone(8.4.6.1.2.2.2), the allocated burst are randomly scattered in the zone. If pilots are not transmitted, MS cannot estimate the wireless channel of the zone. 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(8.4.6).
DL bursts are allocated as subchannels*slots, a zone is filled by these subchannels*slots. If there are many unallocated subchannels*slots in the zone, it is the responsibility of BS to change DL-MAP to adapt to the change of bandwidth. The transmitter may choose not to transmit both data and pilot in the time gap between the end of all mapped bursts and TTG.
----- Original Message -----
From: "Sten Sjöberg" <stinsen@passagen.se>
To: <STDS-802-16@listserv.ieee.org>
Sent: Monday, August 28, 2006 9:47 PM
Subject: [STDS-802-16] Pilot subcarrier transmission in OFDMA
> Hi,
>
> I have a question on DL pilot subcarrier transmission in PUSC and
> FUSC
> zones for OFDMA.
>
> Should pilot subcarriers in DL PUSC and FUSC zones only be
> transmitted
> in allocated OFDM symbols or should pilot subcarriers be transmitted
> in
> the whole zone even when there are parts without allocated OFDM
> symbols?
> Would it be a violation of the standard if pilot subcarriers are
> always transmitted in the whole zone (DL PUSC or FUSC) even if there
> are only a few OFDM symbols allocated in the DL-MAP?
>
> Thanks in advance
>
> Stinsen
>
>