Patent ID: 9119209
Filing Date: 2015-08-25
Classification: H04B,H04L,H04W

Abstract:
1. For use in a wireless communication network, a base station comprising: a two dimensional (2D) antenna array comprising a number N of antenna elements configured in a 2D grid N a controller configured to transmit N channel-state-information reference-signal (CSI-RS) antenna ports (APs) associated with each of the N antenna elements, wherein the controller is configured to transmit at least two sets of CSI-RS APs and the at least one subscriber station derives and feeds back horizontal CSI (H-CSI) and vertical CSI (V-CSI) estimated by the at least one subscriber station receiving and processing the at least two sets of CSI-RS APs, and wherein a total number of CSI-RS APs is less than N.