background_study.md

LEO-NTN-Communication-Signal-Test-and-Verification

低軌衛星與相關通訊網路課程測試與驗證 kEYSIGHT 公司Nick

• 5G NTN Concept
  • 2022 satellite comm news : starlink support ukraine
    • 提供地面接收設備就可以直接上網(當基礎設施被毀壞，依然不受到影響)
  • 4 key LEO network suppliers : TeleSat, Oneweb, SpaceX STARLINK, Amazon
  • use ku, ka band
  • CH bandwidth : 250 MHZ
  • modulation/scheme : propietary
  • NTN status(low data rate, low band) :
    • spaceX cowork with T-mobile 讓手機可以直接連網(T-mobile takes coverage above and beyond with spaceX) : mid-band spetrum
    • 中國移動研究院與中興通訊、交通運輸信息等共同發布 5G NTN技術(3GPP R17 NTN協議，文字短訊、語音對講技術)
    • Emergency SOS via satellite (iphone-14)
    • Qualcomm,Ericson
  • LEO, EMO, HEO 低軌中軌高軌衛星通訊
  • Protocol:
    • Rel-15 (TR 28.811)
    • Rel-16 (TR 38.821)
    • Rel-17 (TR 38.829)
  • LEO Satellite system :
    • Gateway(地面接收設備)
    • Satellite(衛星本體)
    • User Equipment(個人設備)
  • Phased array antenna design workflow challenges
    • SWaP-C (size, weught, power, cost)
  • Digital and RF Mixed DUT becomes a part of the measurement system
  • Modilation distortion solution w/ PNA-X and SG
  • Satellite paylod test
  • G/T measurement
  • Transmitter module test
  • VXG Signal generator
  • FCC part 25 test case
• NTN Reality Innovative test
  • 5G Non Terrestrial Network(NTN)
  • Testing Realistic satellite radio links
  • Channel model structure
  • NR-NTN E2E test bed prototyping
  • cellular and satellite interconnected with 5G NTN
  • Main system parameters of 5G NTN
  • VSAT User equipment
  • software simulation
    • LEO_NTN support NB-IoT

  • hardware emulation