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Channel estimation for an OFDM communication system with inactive subbands

  • US 8,391,413 B2
  • Filed: 12/19/2003
  • Issued: 03/05/2013
  • Est. Priority Date: 12/19/2003
  • Status: Active Grant
First Claim
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1. 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.

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