Coded OFDM 시스템에서 PAPR 감소를 위한 새로운 SLM 기법

Abstract

High peak-to-average power ratio (PAPR) of the transmit signal is a major drawback of orthogonal frequency-division multiplexing (OFDM). In this thesis, we develop a new selected-mapping (SLM) scheme to reduce PAPR in coded OFDM systems. When we use conventional SLM scheme in coded OFDM systems, the decoding complexity is increased in proportion to the number of candidate OFDM signals. Therefore it is necessary to solve decoding complexity problem. The main goal is to propose a new scheme that is not required additional decoding complexity without data rate loss. We employ label bits to insert at information sequence and modulo-2 sum with binary sequence to make modified information sequence. Using this sequence, encoding and puncturing process are implemented. This procedure does not required additional side information. The simulation results show that the PAPR reduction capability of proposed scheme is same with conventional SLM. Further, proposed scheme have SNR gain when we use nonlinear amplifier model.