Patent ID: 8547821

Claim:
A method of determining whether one or more expected signals is received within a set of OFDMA resource elements, said method comprising: receiving an OFDMA transmission on said OFDMA resource elements; forming resource element pairs, wherein the resource elements in each resource element pair are selected from disjoint sets of said OFDMA resource elements, and wherein the disjoint sets of said OFDMA resource elements represent possible locations for the one or more expected signals; for each resource element pair, comparing received signals on each resource element of the resource element pair by multiplying the received signals by a complex conjugate of one of the one or more expected signals to generate two resulting products and calculating, by processing circuitry a difference between the resulting products to cancel out channel coefficients in the resulting products; determining, by the processing circuitry a statistical test value based on the difference between the resulting products in each resource element pair; and determining whether the one or more expected signals is present in the set of OFDMA resource elements by comparing the statistical test value to a threshold.