Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2008-03-25
2008-03-25
Fan, Chieh M. (Department: 2611)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S260000, C375S261000, C375S267000
Reexamination Certificate
active
10971039
ABSTRACT:
An apparatus and method for performing coarse frequency synchronization in an orthogonal frequency division multiplexing (OFDM) receiver includes cyclically shifting a received signal X(k) by a predetermined shift amount d, determining the length of a summation interval according to a phase coherence bandwidth and a number K of sub-bands into which the summation interval is divided, generating and adjusting a symbol time offset according to the number K of sub-bands, generating a weighted phase reference signal Z(k) which is phase-shifted by the symbol time offset and weighted by a weighting vector determined according to a frequency band, partially correlating the shifted signal X(k+d) and the weighted phase reference symbol Z(k) and calculating a partial correlation value for each of the K sub-bands; and determining the shift amount dmaxat a maximum sum of the partial correlation values and outputs the shift amount dmaxas an estimated coarse frequency offset.
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Aghdam Freshteh N.
Fan Chieh M.
Lee & Morse P.C.
Samsung Electronics Co,. Ltd.
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