HaLow Wi-Fi (IEEE 802.11ah) wireless networking standard. Compared to 2.4 GHz and 5 GHz-based conventional Wi-Fi networks, it leverages 900 MHz frequencies license-exempt for enabling networks with a more extended range. Lower energy usage makes it possible to build extensive networks of sensors or stations that work together to communicate signals, which is another advantage. In this paper, the IEEE 802.11ah Wi-Fi system was designed and implemented using MATLAB Simulink and tested under multi-users and channels environment in terms of Spectrum analyzer and constellation Diagram where 4 users, 2 MHz and 4 MHz channels bandwidth used to perfume the test also the power of coarse synchronization, fine synchronization and initial channel estimation, to make Wi-Fi networks with a more excellent range possible were illustrated in space-time stream, MPSK modulation transceiver Simulink is implemented by MATLAB and tested under AWGN, Rayliegh, Rician fading channels in term of BER.