RECEIVER, COMMUNICATION SYSTEM, AND METHOD IMPLEMENTED BY COMPUTER FOR ENABLING BOTH ANALOG AND DIGITAL BEAMFORMING IN COMMUNICATION SYSTEM

摘要

A method for enabling hybrid beamforming in a communication system including a transmitter being able to serve a plurality of receivers, wherein a frequency band comprises at least one subcarrier; wherein each receiver is associated to a set Cprec,k of analog precoding codewords, said method comprising: - for each receiver, computing (202) an analog precoding matrix FRF k associated to said receiver; said computation (202) comprising: /a/ for each subcarrier, performing (202a) a Singular Value Decomposition, SVD, on a channel matrix associated to said receiver and to said each subcarrier; /b/ for each subcarrier, determining a first decomposition matrix Vk(l) based on the relative SVD; /c/ determining (303) an analog precoding codeword which optimizes a first function g1(Vk(1),..., Vk(L), F) of Vk(1),..., Vk(L) and F, for a plurality of F E Cprec,k, wherein L denotes a number of subcarriers.