Method and apparatus for symbol clock recovery from signal havin

Details Method and apparatus for symbol clock recovery from signal havin Method and apparatus for symbol clock recovery from signal havin

1995-05-11

1996-03-12

Chin, Stephen

Pulse or digital communications

Synchronizers

Synchronizing the sampling time of digital data

375326, 377 78, H04L 700

Patent

active

054992737

ABSTRACT:
The present invention provides an apparatus for symbol clock recovery from a received signal having wide range of frequency errors or offsets. Magnitudes of received inphase and quadrature sampled signals are determined (210). These magnitudes are summed and distributed (227) into accumulator registers (231, 232, 233, 235, 237, 239) for accumulating sums of the first and second signals for each sample time and substantially over a length of an expected burst. A maximum-minimum determination circuit (240) chooses the sample time having a largest or smallest sum to provide a recovered clock signal (270). The carrier could then be recovered (260), and a downsampler (250) downsamples the received inphase and quadrature signals based on the recovered clock signal.

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Sabel, L. P. et al., IEEE Global Telecommunications Conference, Conference Record, GLOBECOM 1992, "A Recursive Algorithm for the Estimation of Symbol Timing in PSK Burst Modems", Dec. 6, 1992, pp. 360-364.

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