A CLOCK RECOVERY TECHNIQUE BASED ON SPECTRAL RESTORATION

In this paper a clock recovery technique suitable for several families of modulation-demodulation methods is presented. The modulation metho d should exhibit a timing relationship among the carrier frequency and the symbol rate, Two major examples are Phase Shift Keying (m-PSK) an d Quadrature Amplitude Modulation (m-QAM) families. The key feature of the proposed technique when applied to the above modulation formats i s the relative easiness of synchronization and/or timing recovery. The method is applicable to Non Return to Zero (NRZ) data formats, as wel l. It is based on the modification of conventional, off-the-self, Phas e Locked Loop (PLL) devices.