Patent ID: 8781034

Claim:
A method for communication, the method comprising: in a mobile device: receiving a first OFDM symbol containing a first received cell-specific reference subcarrier; extracting the first received cell-specific reference subcarrier of the first OFDM symbol; receiving a second OFDM symbol containing a second received cell-specific reference subcarrier; extracting the second received cell-specific reference subcarrier of the second OFDM symbol; generating a pair of received subcarriers by computing a scalar product of the first received cell-specific reference subcarrier and a conjugate of the second received cell-specific reference subcarrier; providing a reference sequence, the reference sequence containing pairs of reference subcarriers for multiple combinations of cell-IDs, wherein a pair of reference subcarriers is a scalar product of a first cell-specific reference subcarrier and the conjugate of a second cell-specific reference subcarrier at a same resource element in a time-frequency grid as the first and second received cell-specific subcarriers respectively; correlating the pair of received subcarriers with each pair of reference subcarriers of the reference sequence to generate a cell-specific correlation value associated with each cell-ID of a plurality of cell-specific correlation values; and determining the cell-ID of a strongest cell by searching for a highest correlation value within the plurality of cell-specific correlation values and assigning the cell-ID associated with the highest correlation value to the cell-ID of the strongest cell.