A RECEIVER AND A METHOD FOR ESTIMATING THE CARRIER FREQUENCY OFFSET IN A MULTICARRIER MODULATION SIGNAL

摘要

The invention relates to a receiver (101) for receiving a multicarrier modulation signal over a communication channel (120), wherein the multicarrier modulation signal comprises at least one training signal. The receiver (101) comprises an estimator (103) configured to estimate a fractional frequency offset ε of the multicarrier modulation signal on the basis of the at least one training signal, wherein the estimator (103) is configured to estimate the fractional frequency offset ε on the basis of an approximation (A)of a log-likelihood function λ(ε), wherein the approximation (A) of the log-likelihood function λ(ε) is based on the following equation: (I), wherein (B) denotes a set of weighting coefficients, φ_κ(ε) denotes a set of basis functions and Κ is an odd number equal to or larger than 3 and wherein the set of basis functions is based on the following equations: (II) for odd κ and (III) for even κ, wherein (C) denotes an adjustment factor, which is smaller than one and decreases with increasing Κ; and an adjuster (105) configured to adjust the multicarrier modulation signal on the basis of the estimated fractional frequency offset ε.