Advanced (Zero MUI) AP Cooperation Precoding for Wi-Fi 8

11 January 2023 | 17:30 | INTERLLIGENT Tel Aviv Training Centre, 2 Koyfman st.

Dr. Doron Ezri, CTO Wi-Fi of Datacom PL, Huawei


AP Cooperation schemes which tackle the cell-edge user problem, are expected to be in the focus of Wi-Fi 8.
Among them, Coordinated Beamforming (CoBF) is expected to play a key role, mainly due to the minimal inter-AP synchronization and joint processing it requires.
In this talk we will analyze CoBF from the perspective of multi-user interference (MUI) and show that the scheme currently envisioned in Wi-Fi 8 is broken! Specifically, we will show that (in contrast to DL MU-MIMO) when the number of STA Rx antennas is larger than the number of streams, the STA does not have enough DoF to mitigate the MU interference and the scheme collapses.
After we identify this problem, we will propose a new feedback concept which completely solves the problem, leads to zero MUI; while keeping the Wi-Fi feedback format and implying lower computational complexity! We will demonstrate the ideas in this talk with a short MATLAB demo.