Novel Schemes for Minimizing the PAPR in LTE-OFDM System

Abstract

Orthogonal Frequency Division Multiplexing (OFDM) has gained an increasing attention due to its potential for supporting higher transmission rates in frequency selective fading environments which causes Inter Symbol Interference (ISI). Though, OFDM system has the drawback of large Peak to Average Power Ratio (PAPR) of the signals which are transmitted with a non-constant envelope. Power amplifiers with a large dynamic range are used to reduce PAPR in OFDM system applications. Due to which, the complexity and cost of the system increases. So to overcome this, different PAPR reduction schemes are used. The existing PAPR reduction schemes i.e. Selective Mapping (SLM), Clipping and Filtering (CF) Schemes are discussed and Novel Schemes are proposed in this paper. Based on BER analysis Novel schemes outperforms when compared to SLM and CF.