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

• 来源期刊: 光电子快报（英文版）
• 年，卷（期）: 2018,（1）
• 页码范围: 40-43
• 页数: 4页
• 语种: 英文
• DOI: 10.1007/s11801-018-7142-x

摘要

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.