tailieunhanh - Báo cáo hóa học: " PAPR reduction of OFDM signals using PTS: a real-valued genetic approach"

Tuyển tập các báo cáo nghiên cứu về hóa học được đăng trên tạp chí hóa hoc quốc tế đề tài : PAPR reduction of OFDM signals using PTS: a real-valued genetic approach | Lain et al. EURASIP Journal on Wireless Communications and Networking 2011 2011 126 http content 2011 1 126 o EURASIP Journal on Wireless Communications and Networking a SpringerOpen Journal RESEARCH Open Access PAPR reduction of OFDM signals using PTS a real-valued genetic approach Jenn-Kaie Lain Shi-Yi Wu and Po-Hui Yang Abstract The partial transmit sequences PTS scheme achieves an excellent peak-to-average power ratio PAPR reduction performance of orthogonal frequency division multiplexing OFDM signals at the cost of exhaustively searching all possible rotation phase combinations resulting in high computational complexity. Several researchers have proposed using binary-coded genetic algorithms BGA PTS to reduce both the PAPR and computational load. To improve the PAPR statistics of OFDM signals further while still reducing the computational complexity this paper proposes a new PTS using the real-valued genetic algorithm RVGA . By defining a cost function based on the amount of PAPR PTS can be formulated as an optimization problem over a multidimensional real space and solved by implementing the RVGA method. The simulation results show that the performance of the proposed RVGA PTS along with an extinction and immigration strategy provides approximately the same PAPR statistic as the exhaustive PTS scheme while maintaining a low computational load. Keywords genetic algorithm orthogonal frequency division multiplexing partial transmit sequences 1 Introduction Orthogonal frequency division multiplexing OFDM is an attractive technique for achieving high-bit-rate wireless communication 1 and has been applied extensively to digital transmission such as in wireless local area networks and digital video and audio broadcasting systems. Moreover OFDM has been regarded as a promising transmission technique for next generation wireless mobile communication. However due to its multicarrier nature one of the major drawbacks in OFDM systems is the high