Abstract
Various methods of generating of space-time codes and algebraic structures for increasing noise immunity of MIMO communication systems with a large number of transmitting and receiving antennas are considered. The possibility of generation of an orthogonal precoding matrix in MIMO systems depending on changing reception conditions in a radio channel using feedback from a transmitter to a receiver is shown. It is obtained that to transmit such a precoding matrix in MIMO systems with 4×4, 8×8, 16×16 antenna configurations, feedback is required with the ability to transmit only 2 bits on the reverse link at an energy gain of 1.5 dB ... 2.5 dB compared to an open loop system. The precoding matrices obtained in the article and their formation algorithms can be used in the development of new MIMO mobile communication systems.
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