Patent ID: 7266162

Claim:
A method for recovering a carrier of a received signal including a plurality of frames, the plurality of frames including prescribed frames having a cyclic prefix and data samples and a plurality of non-zero carriers, the method comprising the steps of: effectively removing said cyclic prefix from said prescribed frames; determining an angle of a line relative to a predetermined axis in a complex plane on which a constellation of the non-zero carriers of each of said prescribed frames lie, wherein said complex plain has a real axis and an imaginary axis and said predetermined axis is said real axis, and wherein said angle is between said line and said real axis; utilizing said angle to obtain a value of said carrier frequency offset; fast Fourier transforming (FFT) each of said prescribed frames after the cyclic prefix has been effectively removed to obtain real and imaginary parts of the resulting carriers of each of the prescribed frames, and using said real parts and said imaginary parts to obtain an estimate of said angle; and recovering the carrier using said carrier frequency offset, wherein said non-zero carriers are binary phase shift keyed (BPSK) modulated and each of said non-zero carriers in a prescribed frame has a real part x i and an imaginary part y i , wherein i=0, . . . N−1 represents the carriers and said angle φ is determined in accordance with tan ⁡ ( ϕ ) = ∑ ( x i - x a ) ⁢ ( y i - y a ) ∑ ( x i - x a ) 2 , where x a = Σ ⁢ ⁢ x i N , is the mean value of the real parts of the carriers, and y a = Σ ⁢ ⁢ y i N , is the mean value of the imaginary parts of the carriers.