HYBRID PRECODING DESIGN METHOD FOR ACTUAL BROADBAND LARGE-SCALE MIMO SYSTEM

摘要

The present invention provides a hybrid precoding design method for an actual broadband large-scale MIMO system. The method comprises the following steps: at a radio frequency end, first assuming that analog precoding on all the carriers is the same, and calculating an optimal analog precoding matrix by using complete channel state information according to a criterion of maximizing system spectral efficiency; according to characteristics of a phase shifter in an actual system, determining an analog precoding matrix for each carrier in practice, designing a phase correction matrix in a digital domain, correcting phase shift occurring in the analog precoding on different carriers in practice to approach an optimal analog precoding, and multiplying the phase correction matrix by the analog precoding matrix having a phase shift on each carrier to obtain the designed analog precoding matrix; and finally, designing a digital precoding matrix at a baseband by using equivalent low-dimensional channel state information, and multiplying the digital precoding matrix by the obtained analog precoding to obtain a hybrid precoding design scheme.