Pulse or digital communications – Synchronizers
Reexamination Certificate
2005-09-06
2005-09-06
Corrielus, Jean B. (Department: 2637)
Pulse or digital communications
Synchronizers
C375S375000, C370S515000, C370S518000, C370S519000
Reexamination Certificate
active
06940933
ABSTRACT:
A method, apparatus and system detects a loss of synchronization between a transmitter and a receiver in a multiple-carrier communication system such as an OFDM system. A phase-frequency synchronization detector determines when the receiver has lost synchronization with the transmitter based on a phase-frequency relationship of plurality of pilot signals transmitted at different frequencies from the transmitter and received at the receiver. A loss of synchronization is detected when a slope of a line defined by the phase-frequency relationship exceeds a timing threshold more at a rate in excess of an occurrence threshold within a time period.
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Heinonen Jari M.
Hirano Michael R.
Cingular Wireless II LLC
Corrielus Jean B.
Munoz Guillermo
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