季幸平,王建军,邵宇丰,汪志峰.基于8PSK 和16PSK 调制的全双工RoF 系统研究[J].上海第二工业大学(中文版),2018,(4):280-284
基于8PSK 和16PSK 调制的全双工RoF 系统研究
Research on Full-Duplex RoF System Based on8PSK and 16PSK Modulations
  
DOI:
中文关键词:  光载线通信  8PSK 调制  16PSK 调制  光信噪比  误码率  远距离传输
英文关键词:radio over fiber  8PSK modulation  16PSK modulation  optical signal to noise ratio  bit error rate  long-distance transmission
基金项目:国家自然科学基金(6117064), 上海市教委科研创新项目(15ZZ101), 上海第二工业大学重点学科(XXKZD1605), 上 海第二工业大学内涵建设项目(A11NH170301), 校研究生基金项目(EGD17YJ0049) 资助
作者单位
季幸平 上海第二工业大学计算机与信息工程学院, 上海201209 
王建军 上海第二工业大学计算机与信息工程学院, 上海201209 
邵宇丰 上海第二工业大学计算机与信息工程学院, 上海201209 
汪志峰 上海第二工业大学计算机与信息工程学院, 上海201209 
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中文摘要:
      误码率(bit error rate, BER) 是信号传输质量的重要衡量指标, 为了对比分析8 进制相移键控(eight hexadecimal phase shift keying, 8PSK) 与16 进制相移键控(sixteen hexadecimal phase shift keying, 16PSK) 信号的传输性 能, 建立了一个全双工光载线通信(radio over fiber, RoF) 链路模型。系统的下行链路是对基于马赫增德尔调制器 (Maher-Zehnder modulator, MZM) 的抑制奇次边带两路信号, 分别进行8PSK 和16PSK 调制。上行链路是取下行链 路中一路未被调制的抑制奇次边带信号, 作为上行基带信号的载波信号, 节约系统的成本。该系统分别在不同的光 信噪比(optical signal to noise ratio, OSNR) 和不同传输距离条件下, 仿真分析了下行链路两种调制信号的光谱图及 误码率曲线, 通过分析接收信号的星座图和误码特性证明: 与16PSK 信号相比, 当OSNR > 25 时, 8PSK 信号误码 率量级可以达到10-4(lg BER ≤-3), 当传输距离为40 km 时, 8PSK 的误码率为4.8*10-3 (lg BER = -2.32), 仍然 可以有效传输数据信息。且在不同OSNR 和不同传输距离条件下, 8PSK 的误码率均低于16PSK, 因此8PSK 具有 更可靠的传输性能, 且更适用于远距离传输。
英文摘要:
      The bit error rate (BER) is an important measure of signal transmission quality. In order to study and analyze the transmission performance of eight hexadecimal phase shift keying (8PSK) and sixteen hexadecimal phase shift keying (16PSK) signals, a full-duplex radio over fiber (RoF) link model is built in this paper. For the down link, the RoF system with suppression of even order sidebands based on Maher-Zehnder modulator (MZM) is proposed and uses 8PSK and 16PSK to modulate.In the meanwhile, a sideband of downlink is employed as the carrier of uplink baseband signal to save the cost of the system. Under different optical signal to noise ratio (OSNR) and different transmission distances conditions, the spectrum diagram and error rate curves are obtained. By analyzing the constellation and error characteristics of the received signal, it is proved that compared with 16PSK, when the OSNR is greater than 25, the 8PSK signal BER can reach 10-4 (lg BER ≤-3). When the transmission distance is 40 km, the 8PSK BER is 4.8*10-3 (lg BER = -2.32), data information can still be transmitted efficiently. And under different OSNR and different transmission distances, the BER of 8PSK is lower than 16PSK, so 8PSK has more reliable transmission performance and is more suitable for long-distance transmission.
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