A DIGITAL APPROACH TO CLOCK RECOVERY IN GENERALIZED MINIMUM SHIFT KEYING

A new method for clock recovery to be used with generalized minimum-shift-keying modulations is presented. Attractive features of the method are that it is suited for digital implementation and that its performance is not affected by the carrier phase recovery process. Clock reference is extracted by passing the sampled baseband waveform through the cascade of a nonlinearity, followed by a digital differentiator whose average output represents the error signal to be employed in a tracking loop. The performance of this scheme is analyzed by means of simulation, both in the steady state and in transient conditions. Tracking errors are compared with those attained by the well-known De Buda synchronizer and with the Cramer-Rao lower bound. © 1990 IEEE