Patent ID: 8009747

Claim:
A method for suppressing inter-carrier interference in an orthogonal frequency division multiplexing (OFDM) mobile communication system, comprising: performing down-conversion of a signal received at a receiving end; removing a cyclic prefix of the signal to obtain an original signal containing original OFDM symbols at the receiving end; reattaching the cyclic prefix to the original signal at the receiving end after the receiving end removing the cyclic prefix of the signal; and performing an operation of window adding by a window function at the receiving end, wherein frequency spectrum of the window function in said operation of window adding is: W r ⁡ ( f ) = sin ⁢ ⁢ c ⁡ ( fT u ) ⁡ [ - 2 ⁢ ( a 1 + 2 ⁢ a 2 ) ⁢ sin ⁢ ⁢ c ⁡ ( α ⁢ ⁢ fT u ) + 2 ⁢ a 2 ⁢ sin ⁢ ⁢ c 2 ⁡ ( α 2 ⁢ fT u ) + 2 ⁢ ( a 0 + a 1 + a 2 ) ⁢ cos ⁡ ( απ ⁢ ⁢ fT u ) + 1 - 2 ⁢ a 0 ] wherein sinc(f)=sin(πf)/πf, f represents frequency, T u represents width of the original signal, α represents roll-off coefficient, a 0 represents zero order coefficient of normalized fundamental function, a 1 represents first order coefficient of normalized fundamental function, and a 2 represents second order coefficient of normalized fundamental function.