Patent ID: 8509324

Claim:
A method for transmitting data in a wireless communication system using orthogonal frequency division multiplexing (OFDM), comprising: performing a serial-to-parallel conversion of modulated symbols for the data to obtain a first sequence of samples; performing a time-to-frequency transformation of the first sequence of samples to obtain a second sequence of samples, wherein the time-to-frequency transformation comprises: performing a first cyclic permutation of the first sequence of samples utilizing a first cyclic permutation matrix to obtain a permuted sequence of samples; performing a transformation involving a unitary matrix on the permuted sequence of samples to obtain a transformed sequence of samples; and performing a second cyclic permutation of the transformed sequence of samples utilizing a second cyclic permutation matrix to obtain the second sequence of samples, wherein the first cyclic permutation matrix is characterized by a first index i, and the second cyclic permutation matrix is characterized by a second index j, and wherein the first index i and the second index j are each determined by simulations where a particular set of matrices are used for a particular modulation type; and generating an OFDM symbol for transmission from the second sequence of samples.