Multiple input, multiple output (MIMO) technology refers to the use of multiple antennas and advanced signaling techniques to increase wireless network range, resiliency, and speed. The antennas at each end of the communications circuit are combined to minimize errors and optimize data speed. MIMO is one of several forms of smart antenna technology, the others being MISO (multiple input, single output) and SIMO (single input, multiple output).
MIMO systems are "a proven technology and is currently being used in commercial Fourth Generation (4G) wireless systems moving at less than 30 knots. It has been tested at data rates up to 300 Mbps. MIMO combines information theory, forward error correction coding, signal processing, and propagation theory; therefore, the mathematics behind MIMO and space-time coding is complicated. MIMO would use multiple paths (although they are not necessarily independent) with lower data rates on each path; apply space-time coding and capacity optimization to achieve a total high data rate mission; apply power saving to jammer margin; and evaluate performance in benign and stress conditions.