Comparative Study of PAPR Reduction Techniques in OFDM
Keywords:Orthogonal frequency division multiplexing (OFDM), Peak-to-Average Power Ratio (PAPR), Selected Mapping (SLM), Partial Transmit sequences (PTS), Tone Injection (TI), Tone Reservation (TR), Active Constellation Extension (ACE), Bit error rate (BER).
Orthogonal frequency division multiplexing (OFDM) also referred to as multicarrier communication
systems, have become a key technology in current and for future communication systems. Due to OFDM’s immunity to
many channel imperfections, it is the ideal modulation scheme for many applications which transmit signals in hostile
environments. A major drawback of OFDM is the high peak-to-average-power ratio (PAPR) problem, which can lead to
low power efficiency and nonlinear distortion at the transmitter power amplifier.
In this paper one of disadvantage of OFDM-PAPR and its different reduction technique is discussed. The PAPR of the
transmitted signal power is large, necessitating power backoff, unless PAPR –reduction techniques are incorporated to
control the resulting nonlinear distortion at the power amplification stage. The various techniques for PAPR reduction
are like selected mapping (SLM), partial transmit sequence (PTS), Tone reservation (TR), Tone injection (TI), clipping &
filtering and active constellation Extension(ACE).