Patent ID: 8761314

Claim:
A frequency-domain interpolator, utilized in a receiver of an orthogonal frequency-division multiplexing (OFDM) system, for estimating a plurality of channels corresponding to a plurality of subcarriers, the frequency-domain interpolator comprising: an edge pilot estimation unit, for receiving a plurality of input pilots on the plurality of subcarriers, to generate a plurality of pilots according to the plurality of input pilots, a pilot interval ratio and a complexity parameter, wherein the plurality of pilots comprise the plurality of input pilots and a plurality of edge pilots; a first selection unit, coupled to the edge pilot estimation unit, for receiving the plurality of pilots, to select a plurality of pilot groups from the plurality of pilots according to the pilot interval ratio and the complexity parameter; a second selection unit, for generating a plurality of coefficient groups corresponding to the plurality of channels according to a channel profile and a used pilot interval, wherein each of the plurality of coefficient groups corresponds to a set of the plurality of channels; and a filter unit, coupled to the first selection unit and the second selection unit, for receiving the plurality of pilot groups and the plurality of coefficient groups, to generate the plurality of channels according to the plurality of pilot groups, the plurality of coefficient groups, and a relation between the plurality of pilot groups and the plurality of coefficient groups.