摘要
为了克服高铁移动通信场景下传输容量和多普勒频移带来的困难,提出一种基于光纤无线电(RoF)和正交时频空间(OTFS)调制技术的新型高铁移动通信双层链路结构。在高铁移动通信场景下,有线部分使用RoF技术作为沿铁路分配高频宽带无线信号的解决方案;无线部分使用OTFS调制,通过将时频域信号转换为相对稳定的时延多普勒域信号来解决多普勒频移(DFS)破坏现行宽带正交频分复用(OFDM)信号子载波间正交性的问题。仿真结果表明:在相同传输条件下,当OFDM调制的误码率降为10-1以下时,OTFS调制的误码率已经降低到10-4量级,因此OTFS调制的传输性能更优。
In order to overcome the problems of transmission capacity and Doppler frequency shift in high-speed environments,a novel high-speed railway mobile communication two-layer link structure based on radio over fiber(RoF)and orthogonal time frequency space(OTFS)modulation technology is proposed.In the high-speed railway communication environment,wired part uses RoF technology as a solution for distributing high-frequency broadband wireless signals along the railway.The wireless part uses OTFS modulation to solve the problem of Doppler frequency shift(DFS)destroying the orthogonality between subcarriers of existing wideband orthogonal frequency division multiplexing(OFDM)signals by converting time-frequency domain signals into relatively stable time-delay Doppler domain signals.The simulation results show that under the same transmission conditions,when the bit error rate of OFDM modulation drops below 10-1,the bit error rate of OTFS modulation has dropped to the order of 10-4,and the transmission performance is better.
作者
王丽萱
马健新
WANG Lixuan;MA Jianxin(School of Electronic Engineering,Beijing University of Posts and Telecommunications,Beijing 100089,China)
出处
《光通信技术》
2023年第3期56-61,共6页
Optical Communication Technology
基金
国家重点实验室基金项目(IPOC2020ZT06)资助。
关键词
光纤无线电
高速铁路
多普勒频移
正交时频空间
双层通信架构
radio over fiber
high-speed railway
Doppler frequency shift
orthogonal time frequency space
two-layer communication architecture
