Digital automatic frequency control loop-locking decision method
An automatic frequency control and loop technology, applied in digital transmission systems, electrical components, transmission systems, etc., can solve the problems of high probability of misjudgment, reduce the probability of misjudgment, strengthen constraints, and make the judgment method simple and efficient. accurate effect
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[0020] figure 1 is a block diagram of a lock judgment circuit used in a traditional lock judgment method. Such as figure 1 As shown, the judgment method adopted by the traditional lock judgment circuit is the characteristic of the cosine of the loop error signal. The basic principle is that when the loop is locked, the error signal θ e small, cosθ e =1, the output value of the low-pass filter is relatively large, and when the output value is greater than a certain appropriate threshold, it is considered that the loop is locked. However, in mobile communication channels, affected by Rayleigh fading, even if the loop is locked, but because the signal amplitude is low and the output value of the auxiliary phase detector is small, this method will be misjudged as a loop Unlocked, or the loop is not locked, but the signal amplitude is relatively high, and the output value of the auxiliary phase detector is relatively large. This method will be misjudged as loop locked. Even if ...
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