Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train
Reexamination Certificate
2011-08-16
2011-08-16
Ahn, Sam K (Department: 2611)
Pulse or digital communications
Systems using alternating or pulsating current
Plural channels for transmission of a single pulse train
Reexamination Certificate
active
08000397
ABSTRACT:
Provided is a method and apparatus for acquiring OFDM synchronization even when it fails to detect a plurality of symbols at an initial stage. In the method, a frequency is adjusted to a first frequency band and a cross correlation value between a received preamble symbol and a preset preamble symbol is calculated. When the calculated cross correlation value is larger than a predetermined reference value and is first detected, frequency hopping is performed to receive subsequent symbols and cross correlation values to the subsequent symbols are reexamined. When the reexamined cross correlation value larger than the predetermined reference value is detected, timing synchronization, frequency offset estimation, and frame detection are performed.
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Korean Office Action issued on Apr. 30, 2009 in corresponding Korean Patent Application 10-2007-0128942.
Cho Sang-In
Choi Sang-Sung
Kang Kyu-Min
Ahn Sam K
Electronics and Telecommunications Research Institute
Staas & Halsey , LLP
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