METHOD AND SYSTEM FOR ESTIMATING OFDM TIMING OFFSET

摘要

A method for estimating OFDM timing offset according to the present invention comprises the steps of (a) generating a repetitive structure OFDM preamble having a transmitter (100) of a random sequence, (b) estimating a timing point to a signal path having maximum power in multi-path signals using a timing metric that a receiver (200) obtains from an auto-correlation function and a cross-correlation function, and (c) estimating a timing point of a first signal path in the multi-path signals using a reciprocal of a sample average value of the timing metric generated by multiplying the auto-correlation function and the cross-correlation function by the receiver (200). The present invention is able to calculate the sample average and dispersion values including all of possible signal paths for the cross-correlation function of a receiving signal and obtain tenacity against an instant power change in the signal path using the timing metric for maximizing the change by the first path, thereby improving performance in a radio communication system using the OFDM method. [Reference numerals] (a) Step of generating a repetitive structure OFDM preamble having a transmitter of a random sequence; (AA) Start; (b) Step of estimating a timing point to a signal path having maximum power in multi-path signals using a timing metric that a receiver obtains from an auto-correlation function and a cross-correlation function; (BB) End; (c) Step of estimating a timing point of a first signal path using a reciprocal of a sample average value of the timing metric generated by multiplying the auto-correlation function and the cross-correlation function by the receiver