CHANNEL ESTIMATION IN AN OFDM TRANSMISSION SYSTEM
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United States of America Patent
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Jun 7, 2012
app pub date -
Nov 11, 2011
filing date -
Dec 2, 2010
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Abstract
A method of channel estimation in an OFDM transmission system having a transmitter and a receiver according to standard IEEE 802.11x. The method includes: in the transmitter, setting an identifier in a reserved bits section of the header following the preamble in a physical layer frame; attaching a postamble at the end of said frame without altering the length information in the header; transmitting said frame over the channel, in the receiver, receiving a frame over the channel and checking a reserved bits section in the header of the received frame for the presence of the identifier; and if the identifier is detected, using the postamble and the preamble of the received frame to estimate the channel.
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