earticle

영어

As research continues for the commercialization of 5G and 6G communications, the study of MU-MIMO systems in the mm-Wave band is one of the most key research areas in the field of communication algorithm research. MU-MIMO systems utilize a very wide bandwidth in the tens to hundreds of GHz frequency band, which has a significant disadvantage that the power consumption of the RF at the Rx end is very high. In this paper, a hybrid precoding algorithm in a hybrid beamforming and combining system is studied to solve these drawbacks. The proposed hybrid precoding algorithm defines a problem formulation that can eliminate interference by setting constraint conditions and designing an unconstrained precoder, and then derives a hybrid precoder by projecting a square circle into the null space. The proposed algorithm reduces the computational complexity by about 40% or more by reducing the size and number of SVDs compared to existing works.