Improved PAPR Reduction with Low Complexity in OFDM and Filtered-OFDM (5G) Systems

Abstract

Partial Transmit Sequence (PTS) method is one of the most efficient method to reduce the high Peak to average power ratio (PAPR) in 4G Waveform Structure like the Orthogonal Frequency Division Multiplexing systems. Filtered–OFDM System is the new System within in the 5G waveform Development with maintaining a high level with legacy of commonality OFDM Systems. In Filtered OFDM High PAPR value is the problem because it supports the orthogonal transmission. PTS is the most Popular method to improves the PAPR Reduction Significantly, the high computational complexity level for improving the phases of the transmitting signal limits this system in practical applications, the low computational complexity level of the PTS method results in the adoption of this system for PAPR reduction within the multicarrier systems like OFDM and F-OFDM. during this paper, a substitution low complexity algorithm (Gray-PF-PTS) by combining the gray code and Left Feedback register operation supported a selected mapping rule has been proposed. The numerical results are shows that the Gray-PF-PTS algorithm Broadly reduces the computational complexity level without degradation the PAPR reduction performance compared with the conventional PTS method. Moreover, the OFDM and F-OFDM systems supported the Gray-PF-PTS algorithm are compared regarding the PAPR, Bit Error Rate (BER), and Power Spectrum Density (PSD) performances.