Clipping Based PMPR Reduction Techniques for LTE-OFDM Systems

Long term evolution (LTE) system is designed to provide high speed data rates, high probability, and more efficient use of radio network, latency reduction and improved quality based on orthogonal frequency division multi-plexing (OFDM) technology. Apart from the many advantages, LTE-OFDM system suffers from high peak to mean power ratio (PMPR) is a major issue due to the large envelope fluctuations in the signal. It forces the power amplifier (PA) to operate in the nonlinear region which causes undesired distortions like in-band distortion and out-of band (OOB) radiation. These undesired distortions degrade the bit error rate (BER) performance of the system, causes interference to other users and thus decreases the cellular capacity of the system. To improve the efficiency of LTE-OFDM system, this paper mainly focuses on implementation of two clipping based PMPR reduction techniques (RCF & RFC) and their performance evaluated in terms of complementary cumulative distribution function (CCDF) of PMPR and BER. The results demonstrate that RFC technique have shown better performance with lower BER and significant PMPR reduction than RCF.