Patent ID: 8155166

Claim:
A method for reducing inter-carrier interference (ICI) in a network, wherein the network uses orthogonal frequency division multiplexing (OFDM), comprising a processor for performing steps of the method, comprising the steps of: generating, in a transmitter, a diversified signal B of M data elements repeated K times; multiplying, in the transmitter, the diversified signal B by an orthogonal matrix C according to B·C to produce a spread signal D suitable for transmission in the network at a reduced ICI, wherein the orthogonal matrix is a M×K matrix, and M columns in the orthogonal matrix correspond to K vectors {q 1 , q 2 , q K }, wherein the K vectors are substantially orthogonal, where M and K are integers greater than zero, and C c m εQ={q 1 ,q 2 , . . . q L }; and transmitting the spread signal D in the network.