Method and a channel estimating arrangement for performing channel estimation

A channel estimating arrangement in a receiving communication node for performing channel estimation on a signal received from a transmitting communication node over a radio channel, which receiving communication node and transmitting communication node are arranged to be comprised in a radio communications network, the channel estimating arrangement comprising:

• a receiving circuit configured to receive the signal from the transmitting communication node;
• a matched filtering circuit coupled to the receiving circuit and configured to apply a matched filtering process to the received signal resulting in an estimated channel;
• a transforming circuit coupled to the matched filtering circuit and configured to transform the estimated channel from a frequency domain to a discrete cosine transform domain in a discrete cosine transformation process;
• a truncating circuit coupled to the transforming circuit and configured to apply a sloped window truncation function of an adaptive length onto the transformed estimated channel, wherein the adaptive length in the discrete cosine transform domain is configured to be calculated, based on channel state information of the radio channel, in a calculating circuit coupled to the truncating circuit;
• and
• an inverse transforming circuit coupled to the truncating circuit and configured to transform the truncated transformed estimated channel from the discrete cosine transform domain to the frequency domain in an inverse discrete cosine transformation process resulting in a channel estimate of the channel estimation.