METHOD AND APPARATUS FOR TRANSMITTING AND RECEIVING CHANNEL STATE INFORMATION REFERENCE SIGNAL FOR MASSIVE MULTI INPUT MULTI OUTPUT SYSTEM BASED WIRELESS COMMUNICATION SYSTEMS

摘要

In a massive multiple-input multiple-out (MIMO) system operating in the FDD mode, the present invention effectively transmits a channel state information reference signal (CSI-RS) using only a limited amount of downlink propagation resources And a receiving technology. In this case, when M transmit antennas are used, N beams are formed by N column vectors of an M × N precoding matrix, and the co-channel interference can be suppressed spatially due to high beamforming gain of massive MIMO Allocates one CSI-RS resource multiplexed in the code, frequency, and time domain to the beams. That is, a technique of reusing one resource multiplexed in code, frequency, and time domain in a spatial domain is proposed. The present invention proposes a technique for determining a beam index having a maximum gain by combining an average channel gain by a transmission CSI-RS estimated from an uplink spatial correlation matrix and a resource reuse group index information that is feedbacked momentarily. In order for the receiver of each mobile station to estimate the channel quality information (CQI), the number of beams or the power information allocated to each resource is reused by the base station through RRC signaling, To the user.