A Review of PAPR Reduction Techniques in OFDM
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Abstract
The concept of Orthogonal Frequency Division Multiplexing (OFDM) is an attractive modulation technique for transmitting large
amounts of digital data over radio waves. It is recently being used for both wireless and wired communication. OFDM is a form of multi carrier
modulation technique with high spectral efficiency, robustness to channel fading, immunity to impulse interference, uniform average spectral
density, capacity of handling very strong echoes and less non linear distortion. OFDM is the time domain signal which is a sum of several
sinusoids leads to high Peak to Average Power Ratio (PAPR). High PAPR causes saturation in power amplifiers, leading to inter modulation
products among the sub carriers and disturbing out of band energy. Several techniques have been proposed to reduce PAPR, such as clipping,
windowing, coding, pulse shaping, tone reservation, tone injection, companding, etc. In this paper the various techniques proposed for reducing
the PAPR and the selection criteria for choosing these techniques have been reviewed and compared.
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Keywords: - Orthogonal Frequency Division Multiplexing (OFDM), Peak-to-Average power ratio (PAPR), Peak Envelope Power (PEP),
Selective Level Mapping (SLM), Partial Transmit Sequences (PTS).
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