In terrestrial wireless networks, using multiple access points for joint coherent transmission towards mobile users is well known to provide several benefits. Conversely, for non-terrestrial networks (NTNs), the advantages of joint coherent processing are hardly achievable due to the difficulty to achieve perfect phase synchronization among the transmitting devices. This paper thus investigates the limits and challenges related to joint transmission in a cell-free user-centric massive MIMO NTN scenario. In particular, after introducing the transceiver signal processing for satellite-based joint transmission, we analyze through extensive numerical results how the coherent and non-coherent joint transmissions influence the system performance and envisage the need for approaches that achieve an, at least coarse, phase synchronization among transmitting devices to partly restore the system performance.
Coherent vs. Non-Coherent Joint Transmission in Cell-Free User-Centric Non-Terrestrial Wireless Networks / D'Andrea, C; Foggi, T; Piemontese, A; Ugolini, A; Buzz, S; Colavolpe, G. - (2024), pp. 636-640. (Intervento presentato al convegno 25th IEEE International Workshop on Signal Processing Advances in Wireless Communications, SPAWC 2024 tenutosi a ita nel 2024) [10.1109/SPAWC60668.2024.10694465].
Coherent vs. Non-Coherent Joint Transmission in Cell-Free User-Centric Non-Terrestrial Wireless Networks
Foggi, T;Piemontese, A;Ugolini, A;Colavolpe, G
2024-01-01
Abstract
In terrestrial wireless networks, using multiple access points for joint coherent transmission towards mobile users is well known to provide several benefits. Conversely, for non-terrestrial networks (NTNs), the advantages of joint coherent processing are hardly achievable due to the difficulty to achieve perfect phase synchronization among the transmitting devices. This paper thus investigates the limits and challenges related to joint transmission in a cell-free user-centric massive MIMO NTN scenario. In particular, after introducing the transceiver signal processing for satellite-based joint transmission, we analyze through extensive numerical results how the coherent and non-coherent joint transmissions influence the system performance and envisage the need for approaches that achieve an, at least coarse, phase synchronization among transmitting devices to partly restore the system performance.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.