Abstract
The article represents a method of simplifying MIMO by increasing energy efficiency, where each transmitting antenna transmits not a chosen signal, but its base signals weighted by the corresponding coordinates of the chosen signal. It is shown that in this case, high efficiency of the system can be achieved if a multidimensional biorthogonal signal is used. Since such signals have a minimum number of non-zero coordinates, the number of active transmitting antennas will also be minimal. Examples of the implementation of used four-dimensional signals and corresponding simulation results for Rayleigh and generalized fading (Nakagami-m) conditions are given. In provided examples, cases are considered for a specific number of transmitting antennas, while the number of receiving antennas is different. The obtained results indicate the advantage of simplified MIMO, both in terms of simplicity and energy efficiency, compared to the traditional one.
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