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
Line Following Pick and Place Robot for Green Planet
This project deals with the development and construction of a line follower robot capable to sense multiple colour combinations and placing buds in the given zone by picking it. These two robots to be prepared are as f...
Survey on Biomedical Image Retrieval System
With the increasing use of Social media thousands of images are being downloaded & uploaded every day. Contentbased image retrieval (CBIR) was in research for the last few years. In particular, there has been growing int...
Prototype Development of a SmartphoneControlled Robotic Vehicle with Pick- Place Capability
The work in this paper is directed towards the development of a robotic vehicle with arm and gripper, whose movements can be controlled by giving commands through android based Smartphone over Bluetooth wireless protoco...
CFD Investigation on Thermal Characteristics of Air in a Square Duct using Perforated RIBS
In the present work thermal characteristics of air in a square duct with perforated ribs having Aspect ratio (A.R) 2, 3 and 5 were investigated. Analysis is carried out by using a CFD tool. The flow and thermal characte...
Section Optimization of Diaphragm Wall
Diaphragm wall is common type of earth retention system. Diaphragm walls are generally used in deep basement of building, congested urban spaces, riverfront structures and marine structures. The stability is provided th...