Patent ID: 6975839

Claim:
In a communication system having a receiving station operable to receive data communicated thereto, the data, when sent, exhibiting an initial frequency, and the data, when received at the receiving station, exhibiting a receive frequency, an improvement of apparatus for facilitating estimation of a frequency offset between the initial frequency and the receive frequency, said apparatus comprising: a likelihood polynomial processor to receive indications of the data received at the receiving station, and compute coefficients of said likelihood polynomial processor and a filter coupled to receive indications of the data received at the receiving station, said filter having a selected filter response, said filter for filtering the indications of the data to form filtered data therefrom; and a down sampler coupled to said filter, to receive the filtered data formed thereat, said down sampler for sampling values of selected parts of the filtered data and for forming a sampled representation thereof, the sampled representation used to estimate the frequency offset.