Patent ID: 7010062
Filing Date: 2006-03-07
Classification: H04L

Abstract:
1. A method of compensating for carrier frequency and phase errors of a received multi-carrier modulated (MCM) signal, said received MCM signal including data tones for transmitting data and training tones for error correction, comprising: time-domain down-converting said received MCM signal to base-band to provide a down-converted signal, the down-converted signal including a plurality of data tones for transmitting data and training tones for carrier phase error correction; sampling a training tone of the down-converted signal to provide received data samples; providing a reference signal derived from the training tone of the down-converted signal; and estimating phase errors from a phase difference between the training tone and the reference signal derived from the training tone of the down-converted signal to provide a plurality of received sample phase error estimates for each data tone, wherein the estimating phase errors is provided by a first tone tracking circuit for tracking each training tone and then calculating a phase angle of the training tone, and wherein the first tone tracking circuit comprises a tone tracking mixer filter, a mixer, and a phase angle calculator.