Correction of frequency offsets greater than the Nyquist frequency

摘要

There is disclosed a method of estimating frequency offset of a received signal in a terminal apparatus operating in a wireless communication system. The method comprises a) determining a phase change between a first and a second reference symbol of the received signal, wherein the time distance t between the first and the second reference symbols is associated with an observation frequency f such that f =1/ t ; b) determining a preliminary frequency offset ” f based on the determined phase change, wherein the preliminary frequency offset ” f form a frequency offset hypothesis ” f h ; c) decoding at least a part of the received signal, with application of the frequency offset hypothesis ” f h , to a decoded signal; d) determining whether the decoded signal is a successful decoding, wherein if the decoded signal is a successful decoding, determining the frequency offset hypothesis ” f h to be the estimated frequency offset, and if the decoded signal is not a successful decoding, adjusting the frequency offset hypothesis ” f h , by an integer n times the observation frequency f such that ” f h = ” f + n · f, where n ˆˆ [+/- 1, 2, 3, ...], and repeating steps c) and d). Computer program, frequency controller, and terminal apparatus are also disclosed.