Method and apparatus for mitigating the residual CFO effect on channel estimation for OFDM receivers
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United States of America Patent
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Feb 25, 2014
Grant Date -
Dec 1, 2011
app pub date -
Oct 21, 2010
filing date -
May 29, 2010
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Abstract
A CFO tracking loop module comprises: a numerically-controlled oscillator (NCO) that calculates a phase output; a CFO phase error block that generates a corrected NCO phase output by subtracting half of residual CFO phase error from the NCO phase output; a multiplier that corrects pilot subcarrier's phase by multiplying complex values of the pilot subcarriers by a conjugated complex value of the corrected NCO phase output; a pilot processor that generates a phase error by averaging phases over pilot subcarriers; and a loop filter that filters phase error from the pilot processor and updates the NCO with the filtered phase error.
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