Telecommunications – Receiver or analog modulated signal frequency converter – Signal selection based on frequency
Reexamination Certificate
2006-09-05
2006-09-05
Vuong, Quochien B. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Signal selection based on frequency
C455S067140, C455S323000, C455S334000, C375S324000, C375S344000
Reexamination Certificate
active
07103332
ABSTRACT:
An apparatus and method for compensating for the frequency offset of a received signal in a receiving apparatus of a mobile communication system. In the present invention, a sine component is calculated by adding I and Q channel signals resulting from downconverting a training sequence inserted between data symbols, and a cosine component is calculated by subtracting the Q channel signal from the I channel signal. Using the cosine and sine components at two time points, tangent components for the two time points are computed and thus first and second phase values are obtained. The frequency offset is estimated by determining the slope of a second-order line derived from the first and second phase values. The frequency offset of the received signal is compensated for based on the estimated frequency offset.
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Choi Pil-Soon
Lee Kwy-Ro
Lee Seong-Soo
Son Mi-Hyun
Dilworth & Barrese LLP
Korea Advanced Institute of Science and Technology (KAIST)
Samsung Electronics Co,. Ltd.
Vuong Quochien B.
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