Differential detection based timing recovery for continuous phase modulation

A data-aided (DA) timing recovery method for general continuous phase modulation (CPM) signaling is introduced. This method requires only symbol rate sampling and is independent of the carrier phase offset, owing to the use a differential operator. By examining the phase of the data after the differential operation, we derive an expression of the phase error caused by the timing offset and obtain an efficient timing error function. Then a feedback timing recovery algorithm is developed by exploiting this timing error function. The characteristics of the algorithm are examined through computer simulation