Harmonic retrieval of CFO and frame misalignment for OFDM-based inter-satellite links
17th International Symposium on Wireless Communication Systems, ISWCS 2021, Berlin, Almanya, 6 - 09 Eylül 2021, cilt.2021-September, (Tam Metin Bildiri)
- Yayın Türü: Bildiri / Tam Metin Bildiri
- Cilt numarası: 2021-September
- Doi Numarası: 10.1109/iswcs49558.2021.9562177
- Basıldığı Şehir: Berlin
- Basıldığı Ülke: Almanya
- Anahtar Kelimeler: Doppler shift, Frequency synchronization, Harmonic retrieval, Inter-satellite links, Timing synchronization
- Açık Arşiv Koleksiyonu: AVESİS Açık Erişim Koleksiyonu
- Maltepe Üniversitesi Adresli: Evet
Özet
As dense low Earth orbit (LEO) constellations are being planned, the need for accurate synchronization schemes in high-speed environments remains a challenging problem to tackle. To further improve synchronization accuracy in channeling environments, which can also be applied in the LEO networks, we present a new method for estimating the carrier frequency offset (CFO) and frame misalignment in orthogonal frequency division multiplexing (OFDM) based inter-satellite links. The proposed method requires the transmission of pilot symbols to exploit 2-D estimation of signal parameters via rotational invariance techniques (ESPRIT) and estimate the CFO and the frame misalignment. The Cramer-Rao lower bounds (CRLB) of the joint estimation of the CFO and frame misalignment are also derived. Numerical results show that the difference between the proposed method and the state-of-art method is less than 5dB at its worse.