Abstract:
PURPOSE: A transmitting and receiving device for transmitting and receiving channel state information reference signals at a giant multiple input multiple output system operating in a frequency division duplex mode and a method thereof are provided to effectively transmit the channel information of various antennas and enable a receiving device to effectively estimate downlink channel state information using only downlink resources of limited amount. CONSTITUTION: A control part (1030) generates a signal for each beam to be transmitted through each antenna port. The control part forms the beam by precoding the signal for the each beam generated through a beam forming vector. The control part separates the resource reusing groups of an arbitrary number through grouping beams which is sharing the same resources of the formed beam. The control part transmits the beam to a receiving device by allocating the resource by the resource reusing group. The control part allocates the resources by determining the beam in which a transmitting device has a maximum benefit using feedback information transmitted from the receiving device. [Reference numerals] (1010) Wireless communication part; (1020) Storage part; (1030) Control part; (1031) Signal generation part by beams; (1032) Precoding part; (1033) Scheduler
Abstract:
PURPOSE: A device and a method thereof for giving channel state information (CSI) feedback by using the limited amount of information in a wireless communication system using a massive multiple-input multiple-output (MIMO) operating in a frequency division duplex (FDD) mode are provided for a mobile station to effectively give a base station feedback of the CSI by using the limited amount of feedback information. CONSTITUTION: A control part (620) selects a beam index having a maximum result value by comparing arbitrary function result values having channel coefficients of N as an input. The control part selects a beam index which is above a threshold value which is the constant value of the maximum result value among the function result values. The control part includes the selected beam index in a valid beam index aggregation. The control part estimates channel state information for the valid beam index aggregation. The control part controls a wireless communication part to give a base station feedback of the estimated channel state information and the valid beam index aggregation. [Reference numerals] (610) Wireless communication part; (620) Control part; (623) Channel state estimation part; (625) Valid beam index determination part; (627) Feedback information producing part; (630) Storing part