Performance of PAPR Reduction Techniques in Terms of BER in LTE-OFDM Signals

As a promising technique, OFDM has been widely used in many new and emerging broadband communication systems but the main drawback of Orthogonal Frequency Division Multiplexing (OFDM) is is its high peakto- average power ratio (PAPR). There are many techniques like Clipping, Companding, Active Constellation Extension, Selective Mapping, Partial Transmit Sequence, Interleaving, etc. All the PAPR reduction techniques have some disadvantages , essentially, BER increases .In this paper two PAPR reduction techniques called Clipping Based Active Constellation Extension (CB-ACE) which is based Repeated Clipping and Filtering (RCF) originally proposed by Jean Armstrong and the other technique called Exponential Companding Transform has been compared on the basis of SNR vs BER performance. The simulation results show that, exponential Companding Transform gives better result for PAPR Reduction and provides low complexity in Algorithm.