Patent ID: 7215715

Claim:
An orthogonal frequency division multiplexing (OFDM) system for generating a modulated orthogonal multi-carrier signal, comprising: an over sampling logic to generate an MN over sampled data frame from an N sample data frame, wherein said MN over sampled data frame comprises M-1 zeros between consecutive samples; a wave shaping filter to perform convolution of said over sampled data frame with MN filter coefficients to produce an MN complex filtered sample frame in order to modify the frequency response of said modulated orthogonal multi-carrier signal in the frequency domain; a spectrum mask to modify said MN complex filtered sample frame respectively by MN elements to produce an MN complex filtered and masked sample frame in order to further modify the frequency response of said modulated orthogonal multi-carrier signal; and an inverse fast Fourier transform (IFFT) to generate said modulated orthogonal multi-carrier signal from said MN complex filtered and masked sample frame.