一种适合低轨卫星通信的宽带传输技术

A Broadband Transmission Technology for LEO Satellite Communications

针对低轨卫星通信过程中功率受限的约束以及宽带业务需求的不断增长,研究了一种宽带传输技术。首先,分析了离散傅里叶变换扩频正交频分复用技术的宽带传输能力以及低峰均比特性;其次,进行了低轨卫星运动场景下的多普勒频移及采样偏差的分析,并在此基础上提出了一种低轨宽带通信的帧结构。仿真结果表明,该技术可有效抗低轨场景下的多普勒残留频偏且能完成高速率的传输任务。

To deal with power constraint and increasing broadband service requirement,this paper proposes a broadband transmission technology for low Earth orbit(LEO)satellite communications.Firstly,the ability for broadband transmission and low peak-to-average power ratio(PAPR)of discrete Fourier transform spread spectrum orthogonal frequency division multiplexing technology(DFT-s-OFDM)are analyzed.Secondly,Doppler shift and sampling bias are deduced in the LEO scenario,then a physical frame is designed.Simulation results show that the technology can complete high speed transmission task when most Doppler frequency shift has been removed.