Patent ID: 7515657

Claim:
A system comprising: a receiver module that generates a receiver carrier frequency and that demodulates an orthogonal frequency division multiplexing (OFDM) signal using said receiver carrier frequency; and a CFO estimator module that communicates with said receiver module and that generates a carrier frequency offset (CFO) estimate of said OFDM signal using a method that includes an exponential product based on adjacent symbols and a normalized magnitude, wherein said CFO estimator module generates said CFO estimate based on ɛ ^ = 1 2 ⁢ π ⁢ ⁢ M ⁡ ( 1 + α ) ⁢ ∠ ⁡ ( ∑ k ⁢ = ⁢ 0 N - 1 ⁢ ⁢ ( Y m - 1 * ⁡ [ k ] ⁢ Y m ⁡ [ k ] ) M  Y m - 1 * ⁡ [ k ] ⁢ Y m ⁡ [ k ]  λ ) , wherein M is a number of phases, λ is a normalizing power, N is a number of data samples, α is a ratio of a number of cyclic prefix samples divided by N, m is a symbol index, and Y m-1 *[k]Y m [k] are adjacent received symbols.