Abstract
This thesis proposes an iterative symbol predistortion scheme for peak-to-average power ratio reduction in OFDM systems. In the proposed scheme, the real and/or the imaginary parts of a set of input symbols in the frequency domain are expanded by using a metric for evaluating their contribution to the time-domain peak samples. The real and imaginary parts of the frequency-domain symbols with the largest metrics are selected for expanding by weighting them separately. Different from a previous related work, the weighting functions have less parameters that have to be predetermined according to different OFDM systems. The proposed scheme does not need to transmit any side information to the receiver and there is no additional loading for data detection at the receiver. In addition, by adopting clipping level control during each iteration, the proposed scheme can achieve almost the same PAPR reductions for severely low initial clipping levels.