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US07480337B2 Tracking system comprised in an OFDM receiver 有权
包括在OFDM接收机中的跟踪系统

Tracking system comprised in an OFDM receiver
Abstract:
According to one embodiment, a method for tracking rapid changes in frequency and phase offset in an Orthogonal Frequency Division Multiplexing (OFDM) receiver includes correcting a frequency error of a received OFDM symbol. A Fourier transform operation is performed resulting in a number of independently modulated subcarriers. An initial coarse estimate of the phase of the received OFDM symbol is performed based on the phase of pilot subcarriers. An initial correction of a symbol phase is performed. A data-driven phase estimation is performed on the corrected symbol resulting in a refined phase estimate. A second, more precise, correction of the received OFDM symbol phase is performed. Phase and frequency tracking is performed based on the refined phase estimated.
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