IMD Reduction With SLM and PTS to Improve the Error-Probability Performance of Nonlinearly Distorted OFDM Signals.

In this paper, the authors propose selective map- ping (SLM) and partial transmit sequences (PTS) employing an intermodulation distortion (IMD)-reduction strategy to improve the error-probability performance of nonlinearly distorted orthogonal frequency division multiplexing (OFDM). In particular, the authors consider two IMD-reduction criteria: One requires knowledge of nonlinearity parameters, whereas the other does not. Simulation results demonstrate that in the presence of non-linearities, OFDM systems using SLM or PTS with either of the IMD-reduction strategies perform better than those with peak- to-average power ratio (PAPR) or the recently proposed excess power (EP)-reduction strategies. Furthermore, the error-probability performance of the IMD-reduction technique that exploits knowledge of nonlinearity parameters is only slightly better than that of the technique that does not. Additionally, simulation results also demonstrate that the average out-of-band power generated by the IMD-reduction strategies is similar to that generated by PAPR or EP reduction. [ABSTRACT FROM AUTHOR]