Performance Analysis Of Papr Reduction In Helical Interleaved Ofdm System

Performance Analysis of PAPR Reduction in Helical Interleaved OFDM System

Orthogonal Frequency Division Multiplexing (OFDM) is one of the most promising technique for the fourth generation (4G) communication. High spectral efficiency, immunity to channel interference and nonlinear distortions are some advantages of OFDM. But frequency offset and high peak-to-average power ratios (PAPR) for large number of subcarriers are two major drawbacks for practical application. This paper presents the PAPR reduction techniques for OFDM system such as interleaving and different phase rotation schemes. Selected mapping (SLM) and partial transmit sequence (PTS) are applied with mentioning distinct conditions for the application of these techniques. This paper also presents helical interleaver in OFDM system, for the reduction of system complexity and significant reduction in memory requirement as well. Evaluation is done on the basis of mathematical analysis and mentions best way to simulate in step-wise manner in MATLAB.

Analysis of PAPR Reduction Techniques in OFDM Systems

Papr Reduction Techniques in Wireless Ofdma Networks

In this book, some of the existing PAPR reduction techniques have been analyzed. After discussing the existing PAPR reduction techniques, two new PAPR reduction techniques have been proposed which are based on the existing schemes. The simulation results for the proposed techniques are compared with some of the existing techniques like, Partial Transmit Sequences (PTS), Selective Mapping (SLM), Iterative flipping and new SLM. Although all the existing techniques can reduce the Peak to Average Power Ratio (PAPR), the computer simulation results show that the Proposed techniques can offer better Peak to Average Power Ratio (PAPR) reduction performance. These proposed techniques have been named as Proposed Technique1 and Proposed Technique2 in this work. The results also show that the Proposed technique2 performs better than Proposed technique1 in terms of PAPR reduction when the numbers of subblocks in the OFDM transmitted signal increases. However, when the number of sub-blocks is comparatively lesser, the proposed technique1 gives better performance. The PAPR reduction performance analysis of the existing and proposed techniques is the main focus of my paper.