Patent ID: 8213543

Claim:
A method for use in a receiving apparatus for receiving comprising: the receiving apparatus receiving a first receive signal, including a first pilot symbol, at a first receive time, wherein the first pilot symbol is represented by a first pilot carrier, having a first predetermined value, and a second pilot carrier, having a different, second predetermined value, located at a first predetermined sample frequency and a second predetermined sample frequency, respectively, in a bandwidth of a communication channel; the receiving apparatus determining a first value of the first pilot carrier, located at the first predetermined sample frequency, responsive to receiving the first receive signal; the receiving apparatus determining a second value of the second pilot carrier, located at the second predetermined sample frequency, responsive to receiving the first receive signal; the receiving apparatus receiving a second receive signal, including a second pilot symbol, at a second receive time that is different from the first receive time, wherein the second pilot symbol is represented by a third pilot carrier, having a third predetermined value, and a fourth pilot carrier, having a fourth predetermined value, which is different than the third predetermined value, located at a third predetermined sample frequency and a fourth predetermined sample frequency, respectively, in the bandwidth of the communication channel; the receiving apparatus determining a third value of the third pilot carrier, located at the third predetermined sample frequency, responsive to receiving the second receive signal; the receiving apparatus determining a fourth value of the fourth pilot carrier, located at the fourth predetermined sample frequency, responsive to receiving the second receive signal; the receiving apparatus generating a distortion estimate for each of the first, second, third and fourth predetermined sample frequencies, based on the first, second, third and fourth values, respectively.