Peak-To-Average Power Ratio Reduction Techniques for OFDM Systems

Abstract

Fourth generation wireless communication technology is possible because of the OFDM technology. The modern era wants high data rate by using bandwidth efficiently, which are successfully fulfilled by OFDM technology. OFDM has been institutionalized as a major aspect of the IEEE 802.11a and IEEE 802.11g for high bit rate information transmission over wireless LANs. With so many advantages OFDM have been handicapped with a major disadvantage, high peak-to-average power ratio value. A high peak deviation about average would drive PAs into non-linear region, which causes distortion, ISI, high BER etc.
This thesis gives the idea about OFDM, PAPR, problems with high PAPR, the criteria which should be considered while reducing PAPR value. This thesis will also describe some of the important PAPR reduction techniques and its consequences. After going through this thesis one will found that no single method is the best under all circumstances. Such as SLM and PTS methods has excellent PAPR reduction performance but are complex in nature, whereas clipping is simple and excellent performance in term of PAPR reduction but it increases the BER.