Method and apparatus for mapping quadrature amplitude modulation symbol
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United States of America Patent
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Oct 14, 2014
Grant Date -
May 16, 2013
app pub date -
Sep 14, 2012
filing date -
Nov 11, 2011
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Abstract
A method and an apparatus for mapping a quadrature amplitude modulation (QAM) symbol. The QAM symbol mapping apparatus includes a frequency checker, which checks frequencies of sub-carriers in an orthogonal frequency division multiplexing (OFDM) symbol; and a data categorizer, which maps data coded for error correction and uncoded data to the sub-carriers based on the checked frequencies, wherein the data categorizer maps a combination of the coded data and the uncoded data with respect to sub-carriers having frequencies lower than a reference frequency.
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