The invention provides a method and apparatus for achieving timing
synchronization during signal acquisition and for achieving frequency
synchronization in a digital communication receiver after signal
acquisition. The invention operates by performing multiple correlations
of a received signal, each correlation performed over an symbol interval
and correlating the received signal in the symbol interval with a
sinusoid of an expected frequency. The correlations are combined to
determine a peak and energy, and if the peak to energy ratio is above a
threshold, the symbol timing and frequency offset is estimated.