Using a single phase error algorithm for coarse and fine signal timing synchronisation

摘要

Rather than using separate sample rate offset and phase offset estimation algorithms for coarse timing synchronization and fine timing synchronization of a receiver timing, respectively, one phase error algorithm can be used for both the coarse and fine timing synchronization. In order to perform coarse timing synchronization the phase error indications sampled over a sampling period are used to form an error vector, and a Fourier transform can then be applied to the error vector. An analysis of the Fourier transform of the error vector can be used to determine a frequency component identifying an offset between the receiver frequency and the signal frequency. The frequency of the receiver timing can then be adjusted in accordance with the identified offset, thereby performing the coarse timing synchronization. Once the coarse timing synchronization has been applied, the same phase error algorithm may be used, without the Fourier transform, to implement the fine timing synchronization.

主权项

1. A method of adjusting a receiver timing towards a signal timing of a data signal received at a receiver, said signal timing being a characteristic of said data signal, the method comprising:
receiving the data signal using a receive mode operating in accordance with the receiver timing; determining, according to particular phase error algorithm, a first set of phase error indications indicating phase errors between the receiver timing and the signal timing of the received data signal, wherein the first set of phase error indications forms an error vector; applying a Fourier transform to the error vector; analysing the Fourier transform of the error vector to determine a frequency component of the error vector which identifies a frequency difference between the receiver timing and the signal timing; adjusting the receiver timing to a first adjusted receiver timing based on the identified frequency difference; determining an average of a second set of phase error indications indicating phase errors between the first adjusted receiver timing and the signal timing according to said particular phase error algorithm; and adjusting the first adjusted receiver timing to a second adjusted receiver timing based on the determined average of the second set of phase error indications.