Signal Processing in Multi-Antenna (MIMO) Communication System
In wireless communication the Shannon bound limits the capacity of a link. To increase the capacity in a given bandwidth advanced systems employ multi-antenna techniques. On other hand, multi-antenna systems can be designed to harvest spatial diversity directly or to convert spatial diversity into time or frequency diversity to be harvested by traditional communication techniques such as equalization, channel coding, etc. Multi-antenna systems are using multiple antennas both on transmit and receive side. This lecture starts from a review of multiple antenna channel models and signal characterizations. Channel capacity and diversity is elaborated followed by different antenna techniques (receive diversity, transmit diversity, beamforming, spatial multiplexing). Multi-antenna systems require knowledge of the channel at the transmitter or receiver and this will also be discussed. Major topics of the lecture include: MIMO channels and signal models, MIMO channel capacity, Antenna diversity techniques, Adaptive antenna arrays, Spatial division multiplexing (SDM).