Efficient physical layer preamble format
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United States of America Patent
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Dec 11, 2012
Grant Date -
Nov 19, 2009
app pub date -
May 15, 2009
filing date -
May 15, 2008
priority date (Note) -
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Abstract
A method for generating a preamble of a data unit for transmission via a communication channel includes generating a first field of the preamble using one of a first sequence or a second sequence, such that the first sequence and the second sequence are complementary sequences such that a sum of out-of-phase aperiodic autocorrelation coefficients of the first sequence and the second sequence is zero; generating, using the other one of the first sequence or the second sequence, an indicator of a start of a second field of the preamble, the second field associated with channel estimation information, such that the indicator of the start of the second field immediately follows the first field; and generating the second field of the preamble.
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