| SHAO Yu-feng,CHEN Luo,WANG An-rong,ZHAO Yun-jie,LONG Ying,JI Xing-ping.Analysis of different sub-carrier allocation of M-ary QAM-OFDM downlink in RoF system[J].Optoelectronics Letters,2018,14(1):40-43 |
| Analysis of different sub-carrier allocation of M-ary QAM-OFDM downlink in RoF system |
| Author Name | Affiliation | | SHAO Yu-feng | College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China
Faculty of Engineering, Shanghai Polytechnic University, Shanghai 201209, China | | CHEN Luo | College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China | | WANG An-rong | College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China | | ZHAO Yun-jie | College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China | | LONG Ying | College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China | | JI Xing-ping | Faculty of Engineering, Shanghai Polytechnic University, Shanghai 201209, China |
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| Abstract: |
| In this paper, the performance of a 60 GHz radio over fiber (RoF) 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 16QAM-OFDM signal and 64QAM-OFDM signal. |
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