Patent ID: 7346041

Claim:
A method of processing an orthogonal frequency-division multiplexing signal, comprising: transforming in frequency-to-time transformation data to be transmitted to a basic waveform containing a first set of waveform components representing subbands of a spectrum of the signal, the transformation being done to at least one training symbol and at least one data symbol of an orthogonal frequency-division multiplexing signal burst; forming at least one alternative waveform comprising a second set of waveform components, where the second set of waveform components is formed using waveform components in said first set of waveform components of the basic waveform, and where at least one waveform component in the second set of waveform components is delayed a small number of samples in time compared to a corresponding waveform component in the first set of waveform components; and selecting a waveform for transmission from a group of waveforms, where the group of waveforms contains the basic waveform and said at least one alternative waveform, wherein the selection is done from waveforms transformed from the orthogonal frequency-division multiplexing bursts comprising the at least one training symbol and the at least one data symbol.