Author : Dike U. Ike, Samuel N. John and Charles Ndujiuba

Orthogonal Frequency Division Multiplexing (OFDM) is a type of multicarrier transmission technique with capability of supporting very high data rates. The high Peak-to-Average Power Ratio (PAPR), which leads to OFDM signal distortion and power inefficiency in the OFDM system transmitter radio frequency amplifier, shows a major limitation of OFDM. Several PAPR reduction techniques have been proposed and used, such as, tone injection, amplitude clipping, coding, tone injection, Partial Transmit Sequence (PTS), interleaving, and Selected Mapping (SLM). This paper introduced an effective SLM technique which gives a better OFDM PAPR reduction performance than conventional SLM technique. In achieving this, phase rotation of OFDM symbol is performed using a new set of phase rotation factors, and a Hann window function is applied to further reduce peaks in the OFDM signal. The results of computer simulations show that the PAPR reduction performance of the proposed technique is higher than conventional SLM by 0.2dB.

Keywords: OFDM, Multicarrier Transmission, Selected Mapping, Modified Selected Mapping, PAPR.

Article published in International Journal of Current Engineering and Technology, Vol.7, No.4 (Aug-2017)