MODIFIED SELECTIVE MAPPING TECHNIQUE FOR PEAK-TO-AVERAGE POWER REDUCTION OF ORTHOGONAL FREQUENCY DIVISION MULTILPEXING COMMUNICATIONS SYSTEM
Publication Date : 05/08/2019
High Peak-to-Average Power Ratio (PAPR) also known as Power Envelope Variation (PEV) is the main setback of Orthogonal Frequency Division Multiplexing (OFDM) system, which affects the power efficiency of the radio frequency amplifier, distorts transmitted data, and increase bit error rate etc. Many techniques for mitigating this impairment were proposed such as Selective Mapping Technique (SLM) which was considered as one of the effective technique for reducing the high PEV. However, the Performance of the SLM technique in reducing PEV is largely affected by the design and magnitude of the Phase Rotation Vectors (PRVs) used to generate the signals used in the SLM technique. To deal with these effects, three different normalization pro-cedures in conjunction with Hilbert matrix were deployed to scale down the magnitude of PRVs in order to modify the PEV mitigation processes. The simulation results demonstrated that the modified SLM technique using normalized Hilbert matrix accomplished PAPR reduction as compared to SLM using Hilbert matrix without normalization with 36.0%, 14.0%, and 14.0% as percentage improvement for Eigenvectors and Eigenvalues, Euclidean and determinant of matrix normalization schemes.
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