FREQUENCY ERROR ESTIMATION AND FRAME SYNCHRONIZATION IN OFDM SYSTEM

摘要

PROBLEM TO BE SOLVED: To provide a means for performing frequency error estimation and frame synchronization of an OFDM receiver based on a metric that is indicative of pilot power.;SOLUTION: The metric is defined based on cross-correlation between two received symbols obtained in two OFDM symbol periods. For frequency error estimation, a metric value is computed for each of multiple hypothesized frequency errors. The hypothesized frequency error for the metric value with the largest magnitude is provided as the estimated frequency error. For frame synchronization, a correlation value is obtained for each OFDM symbol period by the correlation metric values obtained in the NC (e.g. most recent) OFDM symbol periods having the NC expected values. The expected values are computed in a manner consistent with the manner in which the metric values are computed. Peak detection is performed on the correlation values obtained for different OFDM symbols to determine frame synchronization.;COPYRIGHT: (C)2011,JPO&INPIT