| In this thesis, three low-complex PAPR reduction schemes for OFDM systems are proposed. All the proposed schemes can be considered as modified versions of the conventional SLM scheme, which can significantly reduce high PAPR of OFDM signals with no distortion.;In the first proposed scheme, a new set of the candidate sequences is generated by partial phase weighting in the time domain and the combination of sub-blocks by applying IFFT properties. In the second scheme which is based on a combination of SLM and PTS, a simple phase optimization technique is introduced. The third scheme forms different 16-QAM signals from 2 QPSK signals. Also, the circular convolution part in TPPW-SLM, which is also a part of Class-III SLM, is applied.;A comparison among the proposed schemes, in terms of PAPR reduction performance and computational complexity reduction, is made, thus allowing selection of the most suitable scheme for a given application. |
