Patent ID: 8675749

Claim:
A method comprising: receiving an Orthogonal Frequency-Division Multiplexing (OFDM) signal with scatter pilots; and producing a first estimate of a channel in a first estimated data subcarrier in a subchannel in an OFDM symbol of the OFDM signal through interpolation, the interpolation being based on estimated channels in both of: (a) at least one pilot subcarrier that is in the same subchannel as the data subcarrier but in a different OFDM symbol than the data subcarrier; and (b) at least two pilot subcarriers that are in the same OFDM symbol as the data subcarrier but a different subchannel than the data subcarrier, wherein the estimated channels in the at least two pilot subcarriers in the same OFDM symbol are determined by: assigning a corresponding weight to each of the at least two pilot subcarriers that are in the same OFDM symbol as the data subcarrier but the different subchannel than the data subcarrier based on impulse response of a filter; in response to detecting that one of the at least two pilot subcarriers is missing, assigning the corresponding weight of the missing pilot subcarrier to a closest existing pilot subcarrier of the at least two pilot subcarriers, such that the closest existing pilot subcarrier is applied at least twice with two different weights to determine the estimated channel; multiplying each of the at least two pilot subcarriers by the corresponding weight to compute two or more products; adding the two or more products in an adder to compute a sum; and dividing the sum by a total weight assigned to all of the at least two pilot subcarriers.