Method and apparatus for symbol clock recovery from signal having wide frequency possibilities
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United States of America Patent
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Mar 12, 1996
Grant Date -
N/A
app pub date -
May 11, 1995
filing date -
May 11, 1995
priority date (Note) -
Expired
status (Latency Note)
Importance
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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