Patent ID: 8111770
Filing Date: 2012-02-07
Classification: H04L

Abstract:
1. An electronic multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) carrier frequency recovery method, comprising: (a) receiving a wirelessly propagated time-domain signal observation; (b) electronically estimating with a computer processor a data-channel vector from a latest observation vector that is taken before a fast Fourier transform (FFT) by correcting for a phase rotation effect based on an initial estimate or an up-to-date estimate of a phase rotation term; (c) removing an effect associated with the data-channel vector from the latest observation vector using the estimated data-channel vector to obtain an up-to-date estimate of the phase rotation term; and (d) repeating step (a) through (c) iteratively on time-domain signal observations to allow for production of FFT input samples that are free or nearly free of carrier frequency and phase error.