US 2011/0235760 A1 · EFFICIENT OFDM PEAK REDUCTION ALGORITHM

Abstract

An efficient method of OFDM peak reduction is described. In an embodiment, a set of the most significant peaks in a symbol of an OFDM signal are identified and then, for each identified peak, a shifted and scaled version of a template cancellation signal is subtracted from the OFDM signal. The template cancellation signal is shifted such that its peak aligns with the identified peak and it is scaled such that it has the opposite phase to the identified peak. No iterative peak search and cancellation is involved in peak reduction, i.e. a cancellation step is not followed by another peak search for the same OFDM symbol. The process is repeated for each symbol in turn and in some embodiments the OFDM signal is up-sampled before it is analyzed to identify the most significant peaks.

Claims20

Dependent claims

A method of peak reduction of an OFDM signal, the method comprising:

identifying at least one peak in a symbol of the OFDM signal;
for each identified peak, generating a cancellation signal by shifting and scaling a pre-computed cancellation waveform;
and
generating a modified OFDM signal by subtracting the cancellation signals from the OFDM signal.

1 more element

Dependencies are inferred from the claim text.

Efficient ofdm peak reduction algorithm

Life of this patent

Efficient ofdm peak reduction algorithm

Life of this patent

Abstract

Claims20