Analysis of different sub-carrier allocation of M-ary QAM-OFDM downlink in RoF system  

作　　者：邵宇丰 陈烙 王安蓉 赵云杰 龙颖 季幸平 

机构地区：[1]College of Electronic and Information Engineering, Chongqing Three Gorges University [2]Faculty of Engineering, Shanghai Polytechnic University

出　　处：《Optoelectronics Letters》2018年第1期40-43,共4页光电子快报（英文版）

基　　金：supported by the National Natural Science Foundation of China(No.61107064);the Bayu Scholars Founding,the Chongqing University Innovation Team Founding(No.KJTD201320);the Chongqing Science and Technology Commission Foundation(Nos.cstc2014jcyj A40046,cstc2016jcyj A1233 and cstc2016jcyj A0246);the Chongqing 2011 Collaborative Innovation Center Project(Chongqing Education Department(2016)No.40);the Chongqing Graduate Scientific Research Innovation Project(Nos.CYS15225 and CYS16225);the Science and Technology Special Funds in Wanzhou District

摘　　要：In this paper, the performance of a 60 GHz radio over fiber(Ro F) system with 4/16/64 quadrature amplitude modulation(QAM) orthogonal frequency division multiplexing(OFDM) downstream signals is studied. Delivery of 10 Gbit/s M-ary QAM(MQAM) OFDM signals through the 20-km-long single-mode fiber(SMF) is complicated in terms of intensity modulation and direct detection(IM/DD). Using self-homodyne method, the beating of two independent light waves generating the millimeter-wave at the photodetector can be down-converted to baseband in the electrical domain. Meanwhile, three kinds of sub-carrier arrangement schemes are compared and discussed, and the simulation results show that lower peak-to-average power ratio(PAPR) can be obtained adopting the adjacent scheme. At bit error rate(BER) of 10^(-3), the receiver sensitivity using 4QAM-OFDM sub-carrier signal is almost enhanced by 4 dB and 9 dB compared with those of 16 QAM-OFDM signal and 64 QAM-OFDM signal.In this paper, the performance of a 60 GHz radio over fiber（Ro F） system with 4/16/64 quadrature amplitude modulation（QAM） orthogonal frequency division multiplexing（OFDM） downstream signals is studied. Delivery of 10 Gbit/s M-ary QAM（MQAM） OFDM signals through the 20-km-long single-mode fiber（SMF） is complicated in terms of intensity modulation and direct detection（IM/DD）. Using self-homodyne method, the beating of two independent light waves generating the millimeter-wave at the photodetector can be down-converted to baseband in the electrical domain. Meanwhile, three kinds of sub-carrier arrangement schemes are compared and discussed, and the simulation results show that lower peak-to-average power ratio（PAPR） can be obtained adopting the adjacent scheme. At bit error rate（BER） of 10^（-3）, the receiver sensitivity using 4QAM-OFDM sub-carrier signal is almost enhanced by 4 dB and 9 dB compared with those of 16 QAM-OFDM signal and 64 QAM-OFDM signal.

关 键 词：QAM Analysis of different sub-carrier allocation of M-ary QAM-OFDM downlink in RoF system 

分 类 号：TN[电子电信]