Hierarchical preamble constructions for OFDMA based on complementary sequences
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United States of America Patent
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Jan 27, 2009
Grant Date -
Feb 17, 2005
app pub date -
Sep 2, 2004
filing date -
Mar 7, 2002
priority date (Note) -
Expired
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Abstract
A method of implementing OFDMA systems with enhanced preamble properties is presented. The transmit power is boosted during a preamble transmission, by utilizing preambles with a low Peak-to-Average Power Ratio (PAPR) property, as opposed to higher PAPR during the data portion of the transmission. Further, sets of preambles satisfying good PAPR properties in OFDMA systems are presented. The preambles satisfy a low Peak-to-Average Power Ratio (PAPR) property for numerous subsets of the usable subcarrier set. A method for generating a hierarchical set of preambles for OFDMA communication systems is described. The method hinges on the good PAPR properties of Golay's complementary sequences, and on hierarchical construction methods of larger complementary sequences out of smaller ones.
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