Re: [STDS-802-16] OFDMA Preamble for 512FFT Case Ambiguity

[krishnamurthy chetan <kchetan@NAVINI.COM>]

Hi,

You need to consider only 143 binary data and leave the last binary which is always 0. If you consider 143 then you will get 512 sub-carrier.

 

 

Rgds

Chetan

 

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From: Amir Kamalizad [mailto:amirk@MORPHOTECH.COM]
Sent: Thursday, October 05, 2006 12:28 AM
To: STDS-802-16@listserv.ieee.org
Subject: [STDS-802-16] OFDMA Preamble for 512FFT Case Ambiguity

 

Hello there,

 

In the OFDMA PHY for FFT 512, the standard has 36 hex characters for each preamble which accounts for 36x4=144 binary data. With preambles being every 3 sub-carrier then the preamble spans total of 144x3=432. Standard also states that there are 42 left and 41 right guards which make the total 515 sub-carrier!

Am I missing anything? I have also noticed that the last two binaries are always zero in all preamble sequences.

 

Regards,

Amir