Method and apparatus for preamble detection for a control signal

摘要

An embodiment of a technique to determine an expected occurrence of a signal is disclosed. The technique includes receiving first and second signals, and storing delay information representing an expected time delay from an occurrence of the first signal to a point in time corresponding approximately to an expected occurrence of the second signal. The technique further includes responding to an occurrence of the first signal by: waiting for a time interval equivalent to the expected time delay, evaluating the second signal at approximately the end of the time interval, and adjusting the stored delay information if the second signal occurred outside a time window associated with the end of the time interval.

主权项

1. An apparatus comprising circuitry that includes a delay evaluation section that:
receives first and second signals; stores delay information representing an expected time delay from an occurrence of the first signal to a point in time corresponding approximately to an expected occurrence of the second signal; and responds to an occurrence of the first signal by:
waiting for a time interval equivalent to the expected time delay;evaluating the second signal at approximately the end of the time interval; andadjusting the stored delay information if the second signal occurred outside a time window associated with the end of the time interval; wherein the delay evaluation section includes a state machine that: carries out the evaluating by determining an actual occurrence of the second signal with respect to the time window; and thereafter generates an adjustment signal, the adjusting of the stored delay information is carried out as a function of the adjustment signal; and wherein the adjustment signal specifies the stored delay information is to be one of incremented or decremented.