Abstract
본 논문에서는 OFDM 시스템의 문제점으로 지적되고 있는 송신단의 피크전력 대 평균전력비(Peak to average Power Rate; PAR) 을 고려하여 부호화된 OFDM (Coded OFDM) 시스템을 설계하고 PAR 저감기법을 사용하여 BER (Bit Error Rate)과 SNR (Signal to Noise Ratio) 특성을 평가하였다. 변조방식에 따른 성능 평가를 위하여 M-ary PSK와 M-ary QAM 방식을 비교하였고, 그 결과 16-PSK와 16-QAM 의 성능이 우수하게 나타났다. 또한 16-QAM이 16-PSK 방식보다 10-3의 오차범위에서 2 dB 더 우수한 성능을 보였으며, Peak Power Clipping 기법에서는 약 5dB 정도 우수한 성능을 보였다. In this paper, considering PAR of transmitter which is pointed out OFDM system's problem, we designed Coded OFDM (COFDM) system and estimated BER and SNR using PAR reduction method In order to evaluate performance, we compared M-ary PSK (M-ary Phase Shift Keying) with M-ary QAM (M-ary Quadrature Amplitude Modulation). In result, performance of 16-PSK and 16-QAM came to good Moreover, 16-QAM showed better performance of about 2 dB in 10-3 error probability and performance of about 5 dB in Peak power clipping than that of 16-PSK.
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