Patent ID: 8416759

Claim:
A method for carrier frequency offset (CFO) and Doppler frequency estimation and correction for Orthogonal Frequency-Division Multiple Access (OFDMA) and Single Carrier-Frequency-Division Multiple Access (SC-FDMA) signals, comprising: accepting, at a receiver, a plurality of multicarrier signals transmitted simultaneously from a plurality of transmitters, the plurality of multicarrier signals having overlapping carrier frequencies, orthogonal reference signals, and one of intra-subframe hopping or inter-subframe hopping; for each of the plurality of multicarrier signals, performing a channel estimate and equalizing a channel; estimating frequency offset between a transmit carrier frequency of each of the plurality of multicarrier signals and a receiver local oscillator frequency using one of phase rotation of data constellations as a function of time or phase rotation of channel estimates as a function of time, wherein: the estimating the frequency offset using the phase rotation of data constellations as a function of time comprises using a data-aided maximum-likelihood estimation (MLE) if the plurality of multicarrier signals have intra-subframe hopping or inter-subframe hopping, and the estimating the frequency offset using the phase rotation of channel estimates as a function of time comprises using a time-domain demodulation reference signal (DM-RS) if the plurality of multicarrier signals have inter-frame hopping or intra-subframe hopping; and determining a combined CFO and Doppler frequency estimate.