Patent ID: 8391413

Claim:
A method of efficiently estimating a frequency response of a wireless channel in a wireless OFDM communication system in which only M subbands centered among N total subbands are used for data/pilot transmission with N−M subbands at either end comprising inactive subbands, the method comprising: (a) obtaining an initial frequency response estimate for subbands in a first set of uniformly spaced apart by N/P subbands based on channel gain estimates for a second set of subbands within the centered M subbands, where P is an integer greater than one and N is total subbands, and wherein the first set includes at least one subband not included in the second set; (b) deriving a time-domain channel impulse response estimate for the wireless channel based on the initial frequency response estimate; and (c) deriving a final frequency response estimate for the wireless channel based on the channel impulse response estimate.