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1. (WO2017157453) A RECEIVER AND A METHOD FOR ESTIMATING THE CARRIER FREQUENCY OFFSET IN A MULTICARRIER MODULATION SIGNAL

Pub. No.:    WO/2017/157453    International Application No.:    PCT/EP2016/055916
Publication Date: Fri Sep 22 01:59:59 CEST 2017 International Filing Date: Sat Mar 19 00:59:59 CET 2016
IPC: H04L 27/26
Applicants: HUAWEI TECHNOLOGIES CO., LTD.
RUSEK, Fredrik
Inventors: RUSEK, Fredrik
Title: A RECEIVER AND A METHOD FOR ESTIMATING THE CARRIER FREQUENCY OFFSET IN A MULTICARRIER MODULATION SIGNAL
Abstract:
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, φκ(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.