Timing extractor, timing extraction method, and demodulator...

Details Timing extractor, timing extraction method, and demodulator... Timing extractor, timing extraction method, and demodulator...

2004-06-07

2008-11-25

Fan, Chieh M (Department: 2611)

Pulse or digital communications

Receivers

Angle modulation

C375S279000, C375S280000, C375S316000, C375S326000, C375S327000, C375S355000, C375S376000, C329S304000, C329S307000, C329S325000, C329S360000

Reexamination Certificate

active

07457375

ABSTRACT:
In a timing component extractor for a digital modulated signal, a frequency converting section30receives a complex baseband signal having a symbol rate fs and formed from an I signal and a Q signal, and converts frequency components ±fs/2, which are present in the complex baseband signal as the data changes, to frequency components ±fs/4. The I signal and Q signal of the complex baseband signal are then nonlinearly processed. In other words, multipliers31, 32square the I signal and the Q signal, respectively, and an adder33adds the respective results of the multipliers31, 32. A BPF34extracts the frequency components ±fs/2 from the output of the adder33, and outputs the extracted frequency components ±fs/2 as a timing signal. Accordingly, processing can be conducted at a sampling frequency which is twice the symbol rate fs. Moreover, timing extraction can be stably conducted without being affected by a carrier frequency offset.

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