Performance Improvement of OFDM system and PAPR Reduction
Journal Title: International Journal for Research in Applied Science and Engineering Technology (IJRASET) - Year 2015, Vol 3, Issue 6
Abstract
One of the major concerns of Orthogonal Frequency Division Multiplexing (OFDM) systems are its high Peak to Average Power Ratio (PAPR) values. These high PAPR values result in serious degradation in performance when a nonlinear power amplifier is employed. The Conventional Partial Transmit Sequence (C-PTS) technique is one of the highly efficient methods for PAPR reduction in OFDM systems. Unfortunately, the number of Inverse Fast Fourier Transform (IFFT) operations employed in C-PTS technique is large and this adds to the computational complexity of the technique. In our proposed Hybrid technique, we have combined the C-PTS technique with predefined phase factor multiplication method. The peaks of the OFDM signal are compressed by making the out of phase sub blocks to in phase sub blocks. All the extra IFFT operations that are required for C-PTS technique are avoided by our proposed method. Signal clipping and filtering result in reducing PAPR values even further. The simulation results show that our proposed (post-phase optimized)PTS technique achieves better reduction compared to the Amplitude Clipping and Selective Level Mapping(SLM) technique at levels of reduced computational complexity.
Authors and Affiliations
Paturi Soma Sekhar Reddy, Mr. Shashidhara K S
Keywords
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