US 2011/0235747 A1 · SIGNALING METHOD IN AN OFDM MULTIPLE ACCESS SYSTEM

Abstract

A method for reducing the peak-to-average ratio in an OFDM communication signal is provided. The method includes defining a constellation having a plurality of symbols, defining a symbol duration for the OFDM communication signal, and defining a plurality of time instants in the symbol duration. A plurality of tones are allocated to a particular communication device, and a discrete signal is constructed in the time domain by mapping symbols from the constellation to the time instants. A continuous signal is generated by applying an interpolation function to the discrete signal such that the continuous signal only includes sinusoids having frequencies which are equal to the allocated tones.

Claims36

Dependent claims

A processor-based apparatus for generating wireless communications, the processor-based apparatus comprising:

a first circuit configured to perform a Discrete Fourier Transform (DFT) on a discrete signal of complex data symbols to obtain a first frequency response vector of length M;
a second circuit configured to expand the first frequency response vector to obtain a second frequency response vector of length N;
a third circuit configured to perform an N-point Inverse DFT (IDFT) on the second frequency response vector of length N, by inserting zero-value symbols corresponding to tones other than tones allocated to a transmitter, to obtain a vector of digital signal samples;
and
a fourth circuit configured to generate a low peak-to-average orthogonal frequency division multiplexing (OFDM) signal representing the vector of digital signal samples for transmission.

2 more elements

Dependencies are inferred from the claim text.

Signaling method in an ofdm multiple access system

Life of this patent

Signaling method in an ofdm multiple access system

Life of this patent

Abstract

Claims36