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학술지 PAPR Analysis of the OFDMA and SC-FDMA in the Uplink of a Mobile Communication System
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이영선, 이일진, 김장수, 유흥균
Journal of the Korean Institute of Electromagnetic Engineering and Science, v.9 no.1, pp.17-24
한국전자파학회 (KIEES)
09ME2300, MoIP 서비스 기반구조 및 응용 표준개발, 강신각
In recent years, OFDMA(orthogonal frequency division multiple access) and SC-FDMA(Single Carrier Frequency Division Multiple Access) have been widely studied for the uplink of a mobile communication system. In this paper, PAPR(Peak-to-Average Power Ratio) and BER(Bit Error Rate) performance of the OFDMA and SC-FDMA systems are studied in relation to the uplink of a mobile communication system. Three kinds of sub-carrier allocation methods in the OFDMA system and 2 kinds of sub-carrier allocation methods in SC-FDMA system are suggested to compare and improve system performance. Simulation results show that in the OFDMA system, the first sub-band allocation method has better PAPR reduction performance than the other methods. In the SC-FDMA system, the distributed allocation method offers similar PAPR, compared with the sub-band allocation method. PAPR can be further reduced by adding a spectrum shaping filter with an appropriate roll of factor. Furthermore, it is found that on average, SC-FDMA can reduce the PAPR by more than 5 dB compared to OFDMA, when the total sub-carrier number is 1,024 and the sub-carrier number allocated to each user changes from 8 to 512. Because of the frequency diversity and low PAPR characteristics, SC-FDMA system of the distributed sub-carrier allocation method can achieve better BER performance than the OFDMA system.
KSP 제안 키워드
Allocation method, BER performance, Bit Error Rate(And BER), Frequency division multiple access(FDMA), Low PAPR, Orthogonal Frequency Division Multiple Access(OFDMA), PAPR Reduction, Peak-to-Average-Power-Ratio(PAPR), Reduction performance, Roll of factor, Shaping filter