Title :
A Low Complexity SLM-Based Radix FFT Method for PAPR Reduction in OFDM Systems
Author :
Ghassemi, Abolfazl ; Gulliver, T. Aaron
Abstract :
A low complexity selective mapping (SLM) technique for reducing the peak-to-average power ratio (PAPR) of an orthogonal frequency division multiplexing (OFDM) signal is introduced. The intermediate signals within an N-point IFFT are used to generate the phase sequences. We use decimation in frequency (DIF) and propose a low computational complexity technique based on multiplying the phase sequences at different IFFT stages. This new technique greatly reduces the multiplicative complexity while providing similar PAPR reduction to ordinary SLM (O-SLM). The additive complexity is also reduced.
Keywords :
OFDM modulation; computational complexity; fast Fourier transforms; signal processing; OFDM reduction; OFDM system; decimation in frequency; intermediate signal; inverse fast Fourier transform; low complexity selective mapping; low computational complexity; multiplicative complexity; orthogonal frequency division multiplexing signal; peak-to-average power ratio reduction; phase sequence generation; radix FFT method; Communication standards; Computational complexity; Frequency division multiplexing; OFDM; Peak to average power ratio; Quadrature amplitude modulation; Quadrature phase shift keying; Signal generators; Signal mapping; Wireless communication; Orthogonal frequency-division multiplexing; Selective Mapping; decimation in frequency (DIF); peak-to-average power ratio (PAPR);
Conference_Titel :
Communications, Computers and Signal Processing, 2007. PacRim 2007. IEEE Pacific Rim Conference on
Conference_Location :
Victoria, BC
Print_ISBN :
978-1-4244-1189-4
Electronic_ISBN :
1-4244-1190-4
DOI :
10.1109/PACRIM.2007.4313235
