Patent ID: 8848844

Claim:
A method, in a receiver node, for compensating a frequency offset of a received data symbol in a signal on an orthogonal frequency division (OFDM) multiplexed carrier from a transmitter node, the receiver node and the transmitter being in a radio communications network, the method comprising: receiving the signal over a radio channel, the signal transmitted in a time structured transmission comprising time slots of a specific length in time, the signal carrying a first reference symbol and a second reference symbol transmitted in a first time slot and an adjacent second time slot, respectively; estimating a first channel estimate of the received first reference symbol; estimating a second channel estimate of the received second reference symbol; determining a first frequency offset estimate based on the first channel estimate and the second channel estimate; determining a second frequency offset estimate by adding or subtracting a frequency value to the first frequency offset estimate; extracting at least one reference symbol of the first and second reference symbols from the received signal; frequency compensating the extracted at least one reference symbol using the first frequency offset estimate resulting in a first compensated reference symbol; frequency compensating the extracted at least one reference symbol using the second frequency offset estimate resulting in a second compensated reference symbol; correlating each of the first and second compensated reference symbols with a target reference symbol; selecting the first or second frequency offset estimate having a largest level of correlation between the corresponding first or second compensated reference symbol and the target reference symbol as a selected frequency offset estimate; and compensating the frequency offset of the received data symbol by using the selected frequency offset estimate.