Patent ID: 8416759
Filing Date: 2013-04-09
Classification: H04W

Abstract:
1. 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: determining a combined CFO and Doppler frequency estimate.