Analysis of different sub-carrier allocation of M-ary QAM-OFDM downlink in RoF system |
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| Authors: | SHAO Yu-feng CHEN Luo WANG An-rong ZHAO Yun-jie LONG Ying JI Xing-ping |
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| Affiliation: | College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China;Faculty of Engineering, Shanghai Polytechnic University, Shanghai 201209, China,College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China,College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China,College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China,College of Electronic and Information Engineering, Chongqing Three Gorges University, Chongqing 404100, China and 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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