1. High reuse gain and diversity gain: The spatial resolution of the massive MIMO system is significantly higher than that of existing MIMO systems, which can deeply exploit the spatial dimension resources and enable multiple users within the base station coverage area to communicate with the base station simultaneously using the spatial degrees of freedom provided by the massive MIMO in the same time-frequency resources, thereby improving the spectrum resource reuse ability and significantly increasing the spectral efficiency without increasing the base station density and bandwidth.
2. High energy efficiency: The massive MIMO system can form narrower beams and concentrate radiation into a smaller spatial area, thus improving the energy efficiency of the RF transmission link between the base station and UE, reducing the power loss of the base station transmission, and is an important technology for building future high-efficiency green broadband wireless communication systems.
3. High spatial resolution: The massive MIMO system has better robustness. Since the number of antennas is much larger than the number of UE, the system has a very high degree of spatial freedom, and has a strong anti-interference ability. When the number of base station antennas tends to infinity, the adverse effects of additive Gaussian white noise and Rayleigh fading can be ignored altogether.
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