Patent ID: 7551677
Filing Date: 2009-06-23
Classification: H04L

Abstract:
1. A pilot phase tracking loop for an orthogonal frequency division multiplexed (OFDM) receiver comprising: a phase rotator for receiving and phase de-rotating an incoming signal; a fast Fourier transform to be coupled to an output of the phase rotator for processing a signal output from the phase rotator; a pilot phase error metric including a discrete Fourier transform portion, the discrete Fourier transform portion coupled to the output of the phase rotator, wherein the pilot phase error metric determines a phase error estimate associated with a received OFDM symbol of the signal output from the phase rotator; a loop filter to be coupled to an output of the pilot phase error metric; and an oscillator to be coupled to an output of the loop filter and having an output to be coupled to the phase rotator such that the phase rotator is adapted to adjust the phase of subsequent OFDM symbols of the incoming signal arriving after the received OFDM symbol by the phase error estimate.