Next generation wireless radios demand for better spectral efficiencies and for high energy efficient (green) handhelds, and multiple-input multiple-output (MIMO) air interfaces represent a popular approach to address these challenges. In this work, spatial signal processing techniques in MIMO radios at different domains are evaluated with respect to their achievable performance, their power
... [Show full abstract] consumption and system sizes. Here, adaptive weighting in the analogue domain reveals several benefits compared to digital approaches. The obtained results are based on a four antennas receiver implementation in an 0.25 µm SiGe BiCMOS process.