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Selected Mapping Technique Based on Erasure Decoding for PAPR Reduction of OFDM Signals  

Kong, Min-Han (Dept. of Control and Instrumentation Engineering, Wonkwang University)
Song, Moon-Kyou (Dept. of Electrical, Electronic and Information Engineering, Wonkwang University)
Publication Information
Journal of the Institute of Electronics Engineers of Korea TC / v.44, no.2, 2007 , pp. 22-28 More about this Journal
Abstract
High PAPR (peak-to-average power ratio) is a major drawback of OFDM (orthogonal frequency division multiplexing) signals. In this paper, a modified SLM (selective mapping) technique that uses erasure decoding of RS (Reed-Solomon) codes is presented. At the transmitter a set of phase sequences are multiplied such that some portions of check symbols in RS-coded OFDM data blocks are phase-rotated. At the receiver, RS decoding is performed with the phase-rotated check symbols being treated as erasures. Hence, there is no need to send side information about the phase sequence selected to transmit for the lowest PAPR. In addition, the estimation process for the selected phase sequence is no longer needed at the receiver, leading to improvement in terms of complexity and performance. To evaluate the performance of this technique, the CCDF (complementary cumulative distribution function) of PAPR, the BER (bit error rate) and the decoding failure probability are compared with those of the previous SLM techniques.
Keywords
erasure decoding; OFDM; PAPR; SLM; RS codes;
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