To extend the proposed RTT estimation framework to support multi-antenna configurations at the gNB and UE, we can leverage the additional spatial diversity provided by multiple antennas. By incorporating multiple antennas, the gNB and UE can exploit spatial processing techniques like beamforming and spatial multiplexing to enhance the accuracy of channel estimation and RTT calculations.
At the gNB, multiple antennas can be used to receive SRS signals from the UE, allowing for spatial diversity and improved channel estimation. By combining the channel estimates from different antennas, the gNB can obtain a more accurate representation of the channel characteristics, leading to better RTT estimation. Similarly, at the UE, multiple antennas can be utilized to transmit SRS signals, enabling spatial diversity in the uplink transmission.
Moreover, with multi-antenna configurations, techniques like spatial filtering and MIMO processing can be employed to mitigate multipath effects and enhance the robustness of RTT estimation in challenging propagation environments. By jointly processing the signals received from different antenna elements, the system can achieve higher accuracy in determining the round-trip time between the UE and gNB. Overall, integrating multi-antenna configurations into the RTT estimation framework can significantly improve positioning accuracy in 5G NR systems.