Patent ID: 8165230

Claim:
A method for estimating Doppler frequency in a wireless communication system, said method comprising: determining a first correlation coefficient (c 1 ) between a currently received Orthogonal Frequency Division Multiplexed (OFDM) symbol and an OFDM symbol received previous to said currently received OFDM symbol, and a second correlation coefficient (c 2 ) between said currently received OFDM symbol and an OFDM symbol received immediately previous to said OFDM symbol received previous to said currently received OFDM symbol; performing a leaky integration across OFDM symbols of the resulting first and second correlation coefficients (c 1 , c 2 ) to obtain an estimate of the first and second correlation coefficients; dividing said second correlation coefficient (c 2 ) by said first correlation coefficient (c 1 ) to obtain a correlation coefficient ratio; and using said correlation coefficient ratio as an estimate of said Doppler frequency in said wireless communication system.