New SUB-SLM Method for PAPR Reduction in OFDM Signals

Selected mapping is an efficient algorithm for PAPR reduction in multicarrier systems. Two major issues in this technique are the side information and complexity of the implementation in terms of the number of IF FT blocks being used. Our proposed algorithm deals with the complexity issue. The new algorithm called sub-SLM algorithm divides the OFDM sequence into multiple equal length sequences then the SLM algorithm is applied on these individual partial sequences. Both the length of the new IFFT and the SLM is changed in the individual block which reduces the complexity. Simulation results show a reduction of almost 3 dB and reduction of complexity by a factor greater than two. The PAPR performance is slightly degraded as compared to the original SLM technique but the complexity is improved considerably.