Pulse or digital communications – Receivers – Particular pulse demodulator or detector
Reexamination Certificate
2005-11-01
2005-11-01
Bayard, Emmanuel (Department: 2631)
Pulse or digital communications
Receivers
Particular pulse demodulator or detector
C375S150000
Reexamination Certificate
active
06961393
ABSTRACT:
An OFDM receiver recovers an rf signal as in-phase (I) and quadrature phase (Q) components of a baseband signal sampled in an A/D converter. The I and Q components of a received symbol are correlated at all sampling points. Correlation values are averaged over the latest L frames and saved in an L-deep FIFO. Symbol amplitude and phase are computed and passed to an offset estimator and an OFDM frame synchronization estimator. A phase-locked loop oscillator provides a sample number identifying the OFDM frame boundary to the offset estimator. An estimated offset value is selected as the negative of the phase angle of the auto correlation.
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Cupo Robert Louis
Karim Muhammad R.
Bayard Emmanuel
Lucent Technologies - Inc.
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