Multiple input multiple output (MIMO) represents a system with multiple transmit and multiple receive antennas. In addition to frequency and time, multiple antennas enable a wireless system to utilize spatial degrees of freedom.
MIMO increases the reliability (via delivering diversity gain) and/or the capacity (via delivering multiplexing gain) of communication systems.
MIMO is one of the key technologies for next generation wireless communications, as evidenced by the widespread interest in the WiMAX and 3GPP-LTE standards.
We have investigated the use of transmit-side message splitting strategies in a three-terminal MIMO relay channel, where the source, relay and destination each employ multiple antennas. While message-splitting techniques do not yield rate benefits in a standard single-input single-output (SISO) relay channel, they are extremely useful given the presence of multiple-antenna nodes. In this scenario we can use message splitting to induce partial cooperation between the source and the relay. Using strategies such as superposition coding and precoding, we have shown that message splitting yields rate benefits over a simple transmit approach that either ignores the relay or ignores the direct link.
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- Wikipedia:MIMO, the Wikipedia article on MIMO