Phase discontinuity-free sampling timing control for IF sampling receiver

The effect of changing sampling timing in intermediate frequency (IF) sampling receivers is analyzed for the case when symbol timing recovery is performed by controlling the IF sampling clock. We note that changing the sampling timing in IF sampling causes a phase discontinuity which is detrimental to the stable operation of the phase recovery loop. We propose a new IF sampling scheme which makes it possible to control sampling timing while maintaining the continuous phase of the output samples so that the subsequent phase recovery properly works.