Pulse or digital communications – Synchronizers
Reexamination Certificate
2006-11-07
2006-11-07
Tran, Khai (Department: 2611)
Pulse or digital communications
Synchronizers
C370S509000, C370S210000
Reexamination Certificate
active
07133479
ABSTRACT:
A frequency synchronization apparatus and method for OFDM systems. The frequency synchronization apparatus is comprised of a digital mixer, a first synchronizer and a second synchronizer. The digital mixer acquires a baseband signal by means of a local frequency and adjusts the local frequency in response to an integer frequency offset and a fractional frequency offset. The first synchronizer takes a sequence of received samples derived from the baseband signal in a time domain to estimate the fractional frequency offset. The fractional frequency offset is fed back to the digital mixer. After that, the second synchronizer takes a sequence of demodulated symbols derived from the baseband signal in a frequency domain. The second synchronizer yields the integer frequency offset through a coarse search stage and a fine search stage. Then, the integer frequency offset is fed back to the digital mixer.
REFERENCES:
patent: 7042858 (2006-05-01), Ma et al.
patent: 2002/0126618 (2002-09-01), Kim
patent: 2003/0072255 (2003-04-01), Ma et al.
patent: 2003/0086366 (2003-05-01), Branlund et al.
patent: 2004/0202234 (2004-10-01), Wang
Birch, Stewart, Kolasch and Birch LLP
Silicon Integrated Systems Corp.
Tran Khai
Ware Cicely
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