METHOD FOR HYBRID ANALOG AND DIGITAL PRECODING FOR USE IN LARGE-SCALE MIMO SYSTEM

摘要

A method for hybrid analog and digital precoding for use in a large-scale multiple-input and multiple-output system. the method comprises: estimating a spatial correlation matrix of a user equipment on the basis of a first pilot signal coming from the user equipment (S11); calculating a wideband analog precoding matrix of an analogue domain on the basis of the estimated spatial correlation matrix (S12); estimating an equivalent channel of the user equipment on the basis of a second pilot signal coming from the user equipment (S21); calculating a narrowband digital precoding matrix of a digital domain on the basis of the estimated equivalent channel (S22), and, transmitting a hybrid analog and digital precoded downlink data signal to the user equipment on the basis of the analogue precoding matrix and of the digital precoding matrix. Provided is a solution for implementing large-scale multiple input and multiple output that is feasible in actual systems, and particularly in systems having strict restrictions on costs, size, and power.