Coordinated beamforming for mutually interfering multi-antenna wlan networks with multipacket reception

This paper presents the design of multiple-input multiple-output (MIMO) coordinated beamforming (CBF) techniques that greatly decrease packet decoding failure due to collisions at co-channel 802.11 WLAN access points (APs). Specifically, we advocate a new WLAN paradigm that promotes the sharing of channel state information (CSI) and uplink precoders between co-channel APs that are capable of multipacket reception (MPR). PHY-layer MIMO CBF design algorithms based on joint and sequential computation that satisfy network-wide MPR conditions are presented. Numerical examples illustrate that the proposed CBF schemes greatly outperform uncoordinated methods in terms of successful packet detection.