Digital fast recovery timing algorithm
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United States of America Patent
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Sep 12, 1989
Grant Date -
N/A
app pub date -
Feb 22, 1988
filing date -
Feb 22, 1988
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Expired
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Abstract
The present invention employs a four sample per baud timing recovery scheme to achieve fast acquistion of initial timing phase uncertainity and reliable fast tracking with low jitter for non-equalized QAM wave forms. The present invention operates for data timing frequency uncertainties up to 0.02 percent in the preferred embodiment. The timing recovery system is implemented with programmable digital signal processor code in connection with a programmable phase baud timer. The baud timer may be implemented in software or hardware. The present scheme is based on a pair of quadrature (T/4 spaced) timing error signals derived by a wave difference method. In the wave difference method, the envelope power of each baud sample is computed by square summing the real and imaginary samples of the received analog signal.
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