A clock recovery scheme for 7PRS signals

Baseband PRS signals do not contain any spectral components at the symbol rate or submultiples thereof. For this reason difficulty is frequently experienced in synchronising a PRS receiver with the data transmitter. This article presents a description of a novel synchronization scheme developed for such signals-using digital signal processing (DSP) techniques. A channel filter with a response derived from the raised cosine (RC) frequency response is used. This is followed by a limited amount of processing, resulting in a substantial signal at the required frequency.