Massive MIMO is a new technology that has the potential to improve wireless communication performance, in particular spectral efficiency, by spatially multiplexing different user equipments (UEs) using many antennas at the access point (AP). In this thesis we provide an in-depth study of a Massive MIMO implementation with wireless local area network (WLAN). We analyze and optimize signal processing and channel estimation techniques to reduce complexity and enable efficient Massive MIMO operation. A Massive MIMO system supported by the current WLAN specification (IEEE 802.11ax) is designed and simulated. It accounts for the main sources of overhead for both uplink (UL) and downlink (DL) (with transmit beamforming (TxBF)) transmissions.