Performance Analysis of Different PAPR Reduction Techniques in OFDM

In todays life, High data rate wireless access is demanded by many applications. Usually, more bandwidth is required for higher data rate transmission in any of the system. With promising technology and ever-increasing wireless devices, the spectrum is becoming scarcer day by day. In this case, using Orthogonal Frequency Division Multiplexing (OFDM) for spectrally efficient transmission is an alternative solution.

Orthogonal Frequency-Division Multiplexing (OFDM) is a popular technique for achieving high-bit-rate wireless data transmission. A major disadvantage of orthogonal frequency-division multiplexing (OFDM) is the high peak-to-average power ratio (PAPR) of the transmitted signal. Partial Transmit Sequence (PTS) and selective mapping (SLM) can improve the PAPR statistics of OFDM signal. In PTS technique, the data block to be transmitted is divided into disjoint subblocks. Each subblock is multiplied by the phase sequence and calculates the combined PAPR for each phase sequence and selects the lowest PAPR sequence for transmission. The minimum In the SLM technique, the data block to be transmitted is converted into parallel sequence and each sequence is multiplied by the different phase sequence and selects the lowest PAPR sequence for transmission. SLM technique is more suitable if the system can tolerate more redundant information and PTS is more suitable if first consideration is complexity.