CORRECTION OF A SAMPLING FREQUENCY OFFSET IN AN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM BY SIDELOBE ANALYSIS OF PILOT SUBCARRIERS

摘要

An OFDM (orthogonal frequency division multiplexing) receiver that detects and corrects a sampling frequency offset of a sampled signal. The OFDM receiver samples an incoming signal in the time domain, multiplies the sampled data by a window function to widen the main lobe of each of the predetermined subcarriers' frequency domain spectrum, takes an FFT (fast Fourier transform) of the sampled signal to analyze the frequency domain samples of each predetermined subcarrier, detects a difference in magnitude of the frequency domain samples for each predetermined subcarrier, and generates a sampling frequency error based on the detected changes in magnitude.