(i9) United States
(12) Patent Application Publication
Wilhelmsson et al.
(54) LOW COMPLEXITY INTER-CARRIER INTERFERENCE CANCELLATION
(76) Inventors: Leif Wilhelmsson, Dalby (SE);
Michael Faulkner, Melbourne (AU)
POTOMAC PATENT GROUP, PLLC
P. O. BOX 270
FREDERICKSBURG, VA 22404 (US)
(21) Appl. No.: 11/350,807
(22) Filed: Feb. 10, 2006
Related U.S. Application Data
(60) Provisional application No. 60/673,384, filed on Apr. 21, 2005.
(51) Int. CI.
H04K 1/10 (2006.01)
(52) U.S. CI 375/260
Inter-carrier interference (ICI) in a kth sub-carrier of an orthogonal frequency division multiplexing (OFDM) signal received at time t is reduced, wherein the received OFDM signal comprises a plurality of sub-carriers. This is achieved by generating a self-interference term, ICIk_L k_L, for a signal received on sub-carrier k-L, wherein L e[ . . . , -3,-2,-1,1,2,3, . . . ], and wherein the self-interference term is an estimate of the data received at time t on the sub-carrier k-L, weighted by a rate of change of the channel through which sub-carrier k-L passes at time t. An ICI cancellation coefficient, GL is obtained, and an estimated ICI term is generated by adjusting the self-interference term, ICIk_L k_L, by an amount based on the ICI cancellation coefficient, GL. The estimated ICI term is then subtracted from a term representing a signal received on the kth sub-carrier at time t.