METHODS AND APPARATUS FOR MULTI-USER MIMO TRANSMISSIONS IN WIRELESS COMMUNICATION SYSTEMS Russian patent published in 2015 - IPC H04B7/04 

FIELD: radio engineering, communication.

SUBSTANCE: invention discloses a wireless communication system which includes a base station capable of communicating with a plurality of user stations. The base station can transmit control information and data to user stations. The base station can also identify a set of RS patterns to be used for communicating with a user station, assign a subset of antenna port numbers within the set of RS patterns to the user stations. The base station can indicate the assigned states in a Downlink Control Information (DCI) format transmitted over a Physical Downlink Control Channel (PDCCH). The base station transmits the data using a subset of antenna ports corresponding to the subset of antenna port numbers. The base station also can map reference signals corresponding to the subset of antenna ports according to at least one RS pattern within the set of RS patterns.

EFFECT: invention relates to wireless communication systems which transmit downlink reference signals (RS) in a multi-user multiple input, multiple output system.

30 cl, 22 dwg, 37 tbl