aPreambleLength + aPLCPHeaderLength

Asked by Mohammad Siddique on 2009-12-03

Hi,

According to IEEE 802.11a-1999, aPreambleLength = 20 us and aPLCPHeaderLength = 4 us for 20MHz channel bandwidth.
According to IEEE 802.11-2007, aPreambleLength = 16 us and aPLCPHeaderLength = 4 us for 20MHz channel bandwidth.

As far I understand in openwns wifimac, second one is implemented for Frame duration calculation. Isn't it?

* In WARP2, first one was considered; which make me curious.

Kind regards,
M Siddique

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openWNS WiFiMAC Edit question
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Last query:
2009-12-03
Last reply:
2009-12-08
Sebastian Max (smx-comnets) said : #1

Dear Mohammad,

> According to IEEE 802.11a-1999, aPreambleLength = 20 us and aPLCPHeaderLength = 4 us for 20MHz channel bandwidth.
> According to IEEE 802.11-2007, aPreambleLength = 16 us and aPLCPHeaderLength = 4 us for 20MHz channel bandwidth.

Well... this is a little bit unspecific :-)
I would rather say
OFDM PHY @ 5GHz:
aPreambleLength=16us, aPLCPHeaderLength=4us (Table 17-15)

OFDM PHY @ 2.4GHz:
aPreambleLength=20us, aPLCPHeaderLength=4us (Table 19-7)

This should also answer you section question, right?

BR,
Sebastian

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