Method and apparatus for reproducing timing, and a...

Pulse or digital communications – Receivers – Angle modulation

Reexamination Certificate

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C375S149000, C375S355000, C375S326000, C375S240010, C600S453000

Reexamination Certificate

active

06850576

ABSTRACT:
A base band signal is sampled, based on an asynchronous sampling clocking, to output two sampled data series. A transmission side complex symbol frequency generator generates a complex transmission symbol frequency component combining an envelope value and an amplitude change amount value, which are each calculated from the two sampled data series. The transmission side complex symbol frequency component is provided to a correlation value calculator that outputs a correlation data series correlated to the complex symbol frequency and the symbol frequency generated by a cosine wave generator. The correlation data series is converted a timing error by an inverse tangent calculator. By the above configuration, a timing reproducing unit, which includes the above components, determines the timing error at a sampling speed of twice the symbol rate.

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F. Patenaude, et al., Proceedings of the International Conference on Communications, vol. 14, pp. 1588-1592, “A New Symbol Timing Tracking Algorithm for π/2-BPSK and π/4-QPSK Modulations”, Jun. 14, 1992.
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