A LOW COMPLEXITY ITERATIVE SLM-OFDM FOR SHF BAND APPLICATIONS
Keywords:Complexity, Iterative Selective Level Mapping (ISLM), OFDM, Peak-to-Average Power Ratio (PAPR), Phase Sequence set, SHF
The transmitted Orthogonal Frequency Division Multiplexing signal in systems such as Wireless LAN,Mobile WiMAX, Digital Video Broadcasting (DVB) operating in the Super High Frequency (SHF) band suffers from high Peak to Average Power Ratio.This is reduced in Selective Level MappingÂ (SLM)Â approachÂ butÂ atÂ theÂ expenseÂ ofÂ increased complexity.Â In this paper,we propose a iterative selective level mapping algorithm for PAPR reduction with reduced computation complexity. The performance of Iterative SLM is investigated for a new phase sequence set based on mutually orthogonal Golay complementary pairs and results are compared with Walsh-Hadamard sequence set. The iterative threshold is varied between 4-8 dB and candidate signal values of 4,8,16 and 32 are considered for a 64 subcarrier system. Computer simulation results show lesserÂ computational complexityÂ in termsÂ of candidate signal requirement in comparison to conventional SLM, while maintaining an almost identical PAPR.Â The new phase sequence set achieves a 1.2 dB and 2.4 dB PAPR improvement over conventional SLM and OFDM respectively for maximum of 16 candidate signals at iterative threshold of 6 dB. The computational complexity reduction achieved is 59%.
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