Patent ID: 8571156

Claim:
A receiver apparatus configured for receiving a signal over a fading channel, wherein symbols are modulated onto subcarrier frequency channels and pilots are placed at some of the subcarrier frequency channels, the receiver apparatus comprising: a frequency domain interpolation unit that is configured to interpolate the pilots at the subcarrier frequency channels and further comprises: a power comparison unit, a first filter element configured to filter a first signal, a second filter element configured to filter a second signal, and a third filter element, wherein a length of said second filter element is variable with respect to a length of said first filter element, said power comparison unit is configured to compare a signal power of the first signal with a signal power of the second signal, and a processing unit is configured to determine an appropriate filter length for said third filter element based on an output of said power comparison unit and said third filter element is configured to filter the received signal with a filter length set to said determined filter length.