Syncomm Technology Corporation

Shih-Heng Chen

This specification discloses a symbol timing recovery circuit, which includes a transform value generation circuit, a selection circuit, a plurality of accumulators, and a comparison module. Without performing phase difference calculation, the invention is a symbol timing recovery circuit that can directly use digital in-phase signal components and digital quadrature signal components of consecutive two symbols to obtain an optimal sampling point. The invention also provides a phase demodulator with a simple structure.

Phase demodulator, symbol timing recovery circuit and the method thereof

The present invention relates to a circuit and method for symbol timing recovery in phase modulation systems. First, phase differences of in-phase signals and quadrature signals in a polar coordinate are generated at the same sampling points of neighboring symbols. Second, an operator is generated by taking a square of a value subtracting the phase difference from a default phase value. Third, the sums of phase differences of every sampling point in a symbol are computed to determine an optimal sampling point in a symbol period and correctly recover symbol timing of signal sequences. By the above properties, the present invention has a simple structure and can shorten an execution time.

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Taoyuan, Taiwan

Shih-Heng Chen