Patent ID: 8660197

Claim:
A method of compensating carrier frequency generation in communication equipment for radio transmission in an Orthogonal Frequency Division Multiplex (OFDM) based wireless radio communication system in which reference signals known to the communication equipment are transmitted in a regular time repetitive manner, wherein a coarse carrier frequency offset estimate and a fine carrier frequency offset estimate are calculated from said reference signals received at said communication equipment, wherein said coarse carrier frequency offset estimate is calculated from reference symbols of one of said reference signals received at said communication equipment, and wherein said carrier frequency generation is compensated by said calculated coarse and fine carrier frequency offset estimates, and said fine carrier frequency offset estimate is calculated from: i) reference symbols of a first of one of said reference signals received at said communication equipment at a first point in time (t 1 ) and ii) reference symbols of a second of one of said reference signals received at said communication equipment at a second point in time (t 2 ) that is different than said first point in time, wherein said reference symbols used to calculate the coarse frequency offset estimate comprise at least a first reference symbol and a second reference symbol, said first reference symbol is modulated on a first carrier, and said second reference symbol is modulated on a second carrier that is different than said first carrier.