Patent ID: 7519123

Claim:
A method of shaping an orthogonal frequency division multiplexing (OFDM) signal spectrum of a transmitted signal, comprising: receiving an input signal that includes a plurality of input components; generating, for one of the plurality of input components, a first instance; obtaining a random sequence having a plurality of elements; shifting the plurality of elements in the random sequence to obtain a shifted sequence; determining, for said one of the plurality of input components, whether a second instance of said one of the plurality of input components is to be different than the first instance based at least in part on a corresponding one of the elements in the shifted random sequence; in the event it is determined to generate the second instance that is different from the first instance, generating the second instance of said one of the plurality of input components that is different from the first instance by time spreading; in the event it is determined to generate the second instance that is not different from the first instance, generating the second instance of said one of the plurality of input components that is the same as the first instance by time spreading; and generating an output signal to be transmitted by a transmitter, wherein the output signal includes the first instance and the second instance, such that the shape of the output signal's orthogonal frequency division multiplexing (OFDM) signal spectrum is different than that of the input signal's.