Author : Minakshi Dubey and Neeraj Shrivastava

Orthogonal Frequency Division Multiplexing or we can also say OFDM is a technique for rapid data-transmission in wireless communication system (applications). A basic problem in OFDM is that the time domain OFDM signal, which is a sum of several signal high peak towards they are leading to power ratio which is average PAPR. Many of the number of techniques for reduction in PAPR in OFDM systems form of system. Here two techniques had been introduced for reducing the PAPR are Selected Mapping or SLM and Partial Transmit Sequence or we can say PTS. We can achieve efficient gains by SLM whereas complexity remains quite moderate. The PTS scheme achieves an excellent PAPR reduction performance of OFDM signals at cost effective. In this paper, we compare the performance of SLM and PTS techniques. The analysis of complementary cumulative distribution function or CCDF of the PAPR being used to measure the performance of reduction techniques also in SLM instead of applying reference data symbols for estimation of channel and synchronization only and carefully selected codeword’s can be transmitted on the pilot subcarriers caring additional information about the selected vector mask for PAPR minimization.

Keywords: Orthogonal Frequency Division Multiplexing (OFDM), Peak- to- average power ratio (PAPR), Selected Mapping (SLM), Partial Transmit Sequence (PTS), Complementary Cumulative Distribution Function (CCDF), Inter-Symbol-Interference (ISI), Fast Fourier Transforms (FFT), inverse fast Fourier transforms (IFFT), IDFT (Inverse discrete Fourier Transform).

Article published in International Journal of Current Engineering and Technology, Vol.5, No.6 (Dec-2015)