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Article:
  When Is 54 Not Equal to 54? A Look at 802.11a, b, and g Throughput
Subject:   Corrections made/new revision date
Date:   2003-08-15 16:15:40
From:   MatthewGast
The date on the article now reads "revised 8/14/03" because two corrections were made.


The smaller correction is that the analysis did not mention the six OFDM tail bits used in 802.11a and 802.11g. Six bits are added as a pad at the end of the data for use with the convolution code. As it turns out, adding six bits to the end of any of the frames discussed in this article does not change the number of symbols, so it does not change any of the calculations.


More substantially, I had neglected the 6 microsecond signal extension time in 802.11g. One anonymous talkback comment as well as a private e-mail pointed out my error. The tables and text have been revised to correct the oversight. The effect of the correction is that an 802.11g-only network will have identical throughput to an 802.11a network.