【CCF-AIR青年基金】高性能卫星通信技术研究 Research on High Performance Satellite Communication

Research Themes

Other

Background

卫星通信被认为是6G通信技术的重要组成部分。地面终端将数据直接发送到卫星,然后卫星将数据转发至远端地面站,进而接入互联网。卫星运行在距地面上百至上万公里的高空中,有潜力提供覆盖全球的通信服务,包括海洋、湖泊、沙漠、高山等地区。

Satellite communication is considered an essential component of 6G communication techniques. Ground user terminals transmit data directly to satellites, which then deliver data to remote ground stations for access to the Internet. Satellites work atop the ground with a distance of hundreds to tens of thousands of kilometers, and have the potential to provide communication services to global areas including oceans, lakes, deserts, mountains, etc.

近期,以StarlinkOneWeb为代表的低轨卫星星座蓬勃发展。相比传统的地球同步卫星,低轨卫星距地面距离更近,因此能够提供更大的网络带宽和更低的传输延时。这两项特性有助于支撑带宽敏感型应用(如高清视频传输)和延时敏感型应用(如远程通话、远程设备操作)。

Recently, Low Earth Orbit (LEO) satellite constellations such as Starlink or OneWeb are thriving. Compared with traditional Geosynchronous Equatorial Orbit (GEO) satellites, LEOs are much closer to the ground and can provide higher network bandwidth and lower transmission latency. These two features can support bandwidth-intensive applications (e.g. high-fidelity video transfer) and latency-sensitive applications (e.g. remote telephony, remote device operation).

为充分发挥低轨卫星大带宽、低延时的特性,为应用性能带来更好体验,我们需要解决两个主要问题。

To fully exploit the bandwidth and latency advantages of LEO satellites and provide good application performance, we should address two major problems.

其一,传统卫星通信基于DVB协议。DVB由欧洲电信标准化组织ETSI制定,目前已经广泛应用于高轨卫星通信中。然而,DVB协议中,调制解调和冗余机制要么无法调整、过于僵化,要么通过动态降低调制解调阶数、增加冗余倍数,追求低误码率。当应用在低轨卫星中时,DVB协议可能无法适配信道的高度动态性,导致无法充分发挥低轨卫星大带宽、低延时的特性。

First, traditional satellite communication depends on the Digital Video Broadcasting (DVB) protocol defined by the European Telecommunications Standards Institute (ETSI). DVB is widely used in GEO communication. However, the modulation and coding scheme (MCS) in DVB is either fixed and unadjustable, or pursuing low Bit Error Rate (BER) by dynamically degrading the modulation order and increasing redundancy ratio. When used in LEO communication, DVB may fail to adapt to the high dynamics of the wireless channels, thus being unable to actually deliver the high bandwidth and low latency features of LEO.

其二,低轨卫星网络能够承载多种应用。不同类型的应用有不同的性能需求。在延时方面,诸如实时金融交易、远程通话等应用需要网络具备极低延时。在带宽方面,诸如高清视频传输等应用需要网络提供高带宽。多种多样的应用性能需求为卫星通信的传输层设计带来了挑战。

Second, LEO satellites can carry multiple types of applications with different performance requirements. With respect to latency, applications like real-time financial trading or remote telephony demand low network latency. On the other hand, applications like high fidelity video transfer require high network bandwidth. Diverse application performance requirements bring challenges to the transport layer design for satellite communication.

Target

  • An MCS scheme designed for LEO satellite communication, which can adapt to channel dynamics and fully deliver the bandwidth and latency features of LEO
  • An application performance-aware transport layer, which can adjust transport algorithms and channel codec strategies according to diverse application performance requirements


  • 适用于低轨卫星通信的信道调制解调及编码机制(MCS),适配低轨卫星信道的动态性,充分发挥低轨卫星大带宽、低延时特性
  • 应用性能可感知的传输层技术,能够面向不同性能需求的应用,调整传输层算法和信道编码策略及参数

Related Research Topics

  • Communication protocol designed for LEO satellites
  • Modulation and demodulation method that can adapt to LEO dynamics
  • Channel coded strategy that can adapt to LEO dynamics
  • Congestion control algorithm for LEO satellite communication
  • Prototype implementation based on Software-defined Radio (SDR)
  • Audio/Video transmission techniques


  • 面向低轨卫星的通信协议
  • 适配低轨卫星动态性的调制解调方法
  • 适配低轨卫星动态性的信道编码策略
  • 面向低轨卫星的拥塞控制(CC
  • 软件定义无线电(SDR)实现
  • 音视频传输技术

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