Patent ID: 9197372
Filing Date: 2015-11-24
Classification: H04B,H04L,H04W,Y02D

Abstract:
1. A method performed by a serving enhanced Node B (eNB) for precoding symbols for multiple-input multiple output (MIMO) beamforming in an orthogonal frequency division multiple access (OFDMA) broadband wireless access network, the method comprising: configuring user equipment (UE) for an eight transmit antenna (8-TX) reporting mode; receiving, from the UE, first and second precoding-matrix indicator (PMI) reports on an uplink channel, each PMI report selected for a four transmit antenna (4-TX) codebook to represent a single subband precoder matrix of an 8-TX codebook; computing the single subband precoder matrix of the 8-TX codebook from both the PMI reports, the single subband precoder matrix defining an 8-TX precoder; and precoding symbols for MIMO beamforming using the 8-TX precoder for an OFDMA downlink transmission, wherein each of the first and second PMI reports include a PMI associated with a same subband of a physical downlink shared channel (PDSCH), the PDSCH being a multi-subband channel between the serving eNB and the UE, and wherein each of the PMIs corresponds to a precoding matrix of the same 4-TX codebook.