ETRI-Knowledge Sharing Plaform



논문 검색
구분 SCI
연도 ~ 키워드


학술대회 Fine Frequency Offset Synchronization Scheme for Internet of Things Devices in 5G non-terrestrial Network
Cited 0 time in scopus Download 7 time Share share facebook twitter linkedin kakaostory
임경래, 유준규, 변우진
International Conference on Information and Communication Technology Convergence (ICTC) 2021, pp.1850-1852
21HH9400, 3차원 공간 위성통신 기술 개발, 박승근
In this paper, we propose a center frequency offset (CFO) estimation and correction algorithm for chirp-spread spectrum (CSS) modulated LoRa waveform in a non-terrestrial network (NTN). However, the frequency of the terrestrial LoRa compensates for signal bandwidth in reciprocal units of a symbol duration, which is coarse and therefore cannot effectively compensate for random frequency offset by the Doppler shift. Furthermore, to realize satellite IoT, a link budget must be achieved using large spreading factors, which are more problematic in satellite IoT because LoRa has the property of being sensitive to frequency offset as the spreading factor increases. To overcome this problem, we propose a fine frequency offset synchronization scheme using FFT. Computer simulation results show that our proposed algorithm works well in the Shadowed Rician fading channel.
KSP 제안 키워드
Center frequency, Computer simulation(MC and MD), Correction algorithm, Doppler Shift, Internet of thing(IoT), Link budget, Rician Fading channel, Shadowed Rician fading, Spreading factor, Synchronization scheme, Terrestrial network