基于光子射频高阶调制的关键技术研究
2018-10-12樊秋月
樊秋月
摘 要: 现有高阶调制技术存在上、下行峰值速率和空口速率过低现象。为了解决此问题,设计一种基于光子射频的高阶调制模型。通过分析OTTD光子移相技术、光载波调相技术、光谱处理射频技术,完成光子射频关键技术研究;在此基础上,通过MQAM高阶信号识别、基于MQAM高阶信号的调制子载波识别,完成基于光子射频高阶调制模型的搭建。模拟该模型的运行环境,对比实验结果表明,与传统方法相比,应用基于光子射频高阶调制模型后有效提升了上、下行峰值速率和空口速率。
关键词: 光子射频; 高阶调制; OTTD; 光谱处理; MQAM; 高阶信号; 子载波识别
中图分类号: TN929.1?34 文献标识码: A 文章编号: 1004?373X(2018)19?0165?04
Abstract: Since the existing high?order modulation technology has the phenomena of low uplink and downlink peak rate and low empty rate, a high?order modulation model based on photon radio frequency (RF) is designed. The research on the key technologies of photon RF was accomplished by analysis on OTTD photonic phase shift technology, optical carrier phase modulation technology and spectrum processing RF technology. On this basis, the high?order modulation model based on photon RF was established by means of the MQAM high?order signal recognition and modulated subcarrier recognition based on MQAM high?order signal. The operation environment of the model was simulated. The experimental results show that the high?order modulation model based on photon RF can improve the uplink and downlink peak rate, and empty rate more effectively in comparison with the traditional methods.
Keywords: photon radio frequency; high?order modulation; OTTD; spectral processing; MQAM; high?order signal; subcarrier recognition
0 引 言
现有高阶调制识别方法通过操作人员手持接收仪器的方式,接收到待调制信号,再经过复杂的观测分析过程,确定接收到信号的频谱形状及时域波形,进而完成信号调制方式的判断,根据判断结果选择最为适宜的解调器进行解调处理[1?2]。这种方式虽然可以得到较为可靠的调制结果,但在调制过程中上、下行峰值速率和空口速率都只能维持在较低水平,限制了调制类型多样性的发展。随着微波光子学的不断发展,利用光子条件对微波、毫米波信号进行生成、控制、传输等处理的技术已经发展得十分出色。光子射频技术主要由OTTD光子移相技术、光载波调相技术、光谱处理射频技术组成。利用光子射频技术改进现有高阶调制方法,当微波光子系统的工作频率逐渐达到最大频率界限时,光电子器件及其子系统间产生的各种微波传输问题都得到了有效改进。……
