Patent ID: 8514987

Claim:
A method of detecting a frequency offset (A) between data at a transmission symbol rate (fTx) transmitted from a transmitter and a reception sampling frequency (fRx) operating in a receiver on the basis of hard decision based on a binary number in the receiver, the method comprising: demultiplexing by an electrical circuit a wireless signal transmitted by the transmitter and received by the receiver into a plurality of partition phases; a data oversampling step of making a hard decision about which binary number (1 or −1) or (1 or 0) is assigned to each of the plurality of partition phases, (phase 1 , phase 2 , and phase 3 ), the plurality of partition phases being obtained by sampling in which a symbol is divided into n sections in accordance with an oversampling frequency at or above n times the reception sampling frequency, where n is a natural number more than two; a step of obtaining a binary symbol decision value by making a symbol decision from the binary numbers of the plurality of partition phases subjected to the hard decision; a step of obtaining a timing correlation value for each of the plurality of partition phases by calculating correlation between a binary number of the symbol decision value and a binary number of a partition phase subjected to the hard decision in a symbol period associated with the symbol decision value by performing multiplication when the binary number (1, −1) is assigned or performing “exclusive-or” when the binary number (1, 0) is assigned; a step of cumulatively adding the obtained timing correlation values for a specific period or for a specific number of symbols to obtain a cumulative timing correlation value; and a step of comparing a plurality of cumulative timing correlation values among the plurality of partition phases to obtain the frequency offset (A).