Evaluation of PAPR in OFDM System by Changing the IFFT Size for BPSK Modulation Scheme

OFDM is a broadband multicarrier modulation method that offers superior performance and benefits over older, more traditional single-carrier modulation methods. It is a better fit with today’s high-speed data requirements and operation in the UHF and microwave spectrum. Orthogonal frequency division multiplexing (OFDM) is one of the multicarrier modulation (MCM) techniques that transmit signals through multiple carriers. These carriers (sub carriers) have different frequencies and they are orthogonal to each other. There are various issues related to OFDM such as dispersion (ICI), external interference (crosstalk) and nonlinearities (PAPR). In this paper we discussed the effect of IFFT size on PAPR for BPSK modulation scheme for without any reduction technique, with clipping technique and with comapnding technique."