Apparatus and method for correcting iterative residual frequency and phase in turbo coded OFDM system
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United States of America Patent
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Oct 11, 2011
Grant Date -
Dec 25, 2008
app pub date -
Dec 7, 2006
filing date -
Dec 8, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Provided is an iterative residual frequency and phase compensation apparatus for an OFDM system and a method thereof. The apparatus includes: a first classifying unit for classifying symbol sequences by each subcarrier wave; a soft-decision calculating unit for calculating a soft-decision value of a data symbol using a soft-decision reliability obtained from iterative decoding performed by the iterative decoder; a classifying unit for classifying the soft-decision values by a carrier wave; a frequency estimating unit for estimating a residual frequency error of each carrier wave using the soft-decision value; a phase estimating unit for estimating an average residual phase error using the soft-decision value; a frequency and phase compensating unit for compensating frequencies and phases for input symbols of each carrier wave using the estimated frequency error and the estimated phase error; and a buffer for temporally storing the compensated symbols to provide it to the first classifying unit.
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