Circuit implications of MIMO technology for advanced wireless local area networks

This paper first gives a brief introduction to multiple input multiple output (MIMO) wireless communication systems. Various architectures of MIMO systems and corresponding features are discussed, including those proposed for the IEEE 802.11n standards committee. The constraints on RF circuits in a MIMO system are then addressed, as well as the impact of analog impairments on the performance of MIMO systems. Finally, the paper discusses calibration procedures in MIMO systems.