Simulation of OFDM and Performance Analysis of PAPR Reduction Technique

Abstract

OFDM (Orthogonal Frequency Division Multiplexing) technology has become a pri- ority in the mobile communication due to its feature of partitioning the available bandwidth into sub-channels with much lower bandwidth. The report contains an introduction to multi-carrier modulation which emphasizes on OFDM followed by its mathematical and qualitative description. The MATLAB software is used for the simulations of the OFDM where the various parameters are analyzed. Moreover the results for M-PSK, M-QAM and the e ect of symbol period are calculated. The second phase describes the PAPR (Peak to Average Power Ratio) -reduction techniques, which demonstrates Selected Mapping (SLM) and Partial Transmit Se- quences (PTS) techniques. In an SLM system, an OFDM symbol is mapped to a set of quasi-independent equivalent symbols and then the lowest-PAR symbol is selected for transmission. In the PTS the PAPR reduction process is made more e cient by varying the number of phase sequences and the length of block size. Here for both techniques number of sub blocks and phase sequences are changed and results are obtained using MATLAB Software.