发明授权
US08416759B1 Carrier frequency offset and doppler frequency estimation and correction for OFDMA and SC-FDMA 有权
OFDMA和SC-FDMA的载波频率偏移和多普勒频率估计和校正

Carrier frequency offset and doppler frequency estimation and correction for OFDMA and SC-FDMA
摘要:
A system and method are provided 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 in a wireless communications receiver. The receiver is capable of accepting a plurality of multicarrier signals transmitted simultaneously from a plurality of transmitters, with overlapping carrier frequencies and orthogonal reference signals. For each multicarrier signal, a channel estimate is performed and the channel is equalized. Then, a frequency offset is estimated between the transmit carrier frequency of each multicarrier signal and a receiver local oscillator frequency using either the phase rotation of data constellations as a function of time or the phase rotation of channel estimates as a function of time. The receiver supplies the CFO/Doppler frequency estimates and corrects the equalized symbols prior to demodulation.
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