FIELD: information technology.
SUBSTANCE: frequency information is extracted based on an observation of a single symbol carrying pilot tones, which can be at any bandwidth location. Specifically, the frequency error information is extracted after selecting the pilot tone assigned to a specific user, converting the selected pilot tone into a time-domain pilot tone, comparing it with a complex-conjugate pilot tone, projecting the result onto the top half or lower half of a unit circle by multiplying the result by ei2π0.5n/N and e-j2π0.5n/N respectively, and calculating the square difference of the magnitude of the resultant vector sum for each half as a frequency error estimate. Frequency error can be corrected based on the estimate. Further, the disclosed aspects can be applied to multi-path environments.
EFFECT: performing frequency error estimation.
28 cl, 14 dwg
