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What are the transmission durations for PLCP preamble and PLCP header in 802.11n Greenfield mode

wireless communications, WiFI

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The PLCP preamble and PLCP header in 802.11n Greenfield mode transmit at 2TX20GF for the 20 MHx Channels and 1TX40GF for the 40 MHx Channels. Their transmissions are based on the number of transmit antennas and the channel bandwidth. You can check out http://www.mayflex.com/_assets/downloads/Wireless_4111466_0000_ENG_A_W.pdf for more details.

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Thanks a lot Vincent!
I have one more question for you. Does Block Ack frame follow the same length of PLCP in 802.11n GF? I mean do the AMPDU and Block Ack frames have the same length of PLCP header and preamble?
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