Fractional Selective Mapping Using Decimation in Time IFFT/FFT

An IFFT-based selective mapping (SLM) technique is presented for reducing the peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal. We use fractional inputs at intermediate stages within a decimation in time (DIT) IFFT to generate the SLM sequences. This significantly reduces the computational complexity while maintaining a PAPR performance close to that with original SLM. This new technique provides a better PAPR versus complexity tradeoff compared to previous techniques. Further, this approach provides similar complexity reduction for both low and high radix IFFT algorithms.