Patent ID: 7573960

Claim:
A method of interference cancellation in a victim band for application in multi-band orthogonal frequency division multiplex (OFDM) system transmitters comprising the steps of: storing the pre-computed coefficients of first and last row of transform matrix; convolving the pre-computed transform matrix with a current information data vector for frequencies within victim band and two adjacent frequencies, said convolving step including multiplying the current information data vector by recalled coefficients forming a product, computing the sum of the product with a prior value of the product, quantizating the sum, and modulating the tone by the quantized sum; transmitting OFDM tones on said two adjacent frequencies outside the victim band to eliminate interference within the victim band according to the convolution results; and transmitting eliminating tones within the victim band to cancel interference within victim band by caused by said OFDM tones outside the victim band.