Indian Journal of Science and Technology

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Objectives: To reduce the PAPR in OFDM signal. Methods/Statistical Analysis: The foremost problem found in OFDM is the high PAPR (Peak to Average Power Ratio). The variety of processes worned to diminish the high PAPR is: Partial Transmit Sequence (PTS) Coding, Clipping, m-Law, Selective Mapping (SLM), Exponential Companding (EC) etc. Findings: However, these PAPR reduction techniques have some disadvantages, such as Higher Modulation Order, Degradation of the BER and SNR performance, increasing of Average Power etc. A new Nonlinear Companding technique is proposed which aims at compressing the large amplitude signals and at the same time sustaining the normal power as stable. The Simulation results show that the proposed Companding method possibly provides an improved scheme recital in stipulations of PAPR lessening, and BER recital. Application/Improvements: Amplifier will not get damage.

Keywords

Exponential Companding (EC), PAPR (Peak to Average Power Ratio), Partial Transmit Sequence (PTS), Selective Mapping (SLM)
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