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In public channels, common signals need to be transmitted omnidirectionally to achieve cell-wide coverage. In this paper, we consider omnidirectional beamforming for common signal transmission in the massive multi-input multi-output (MIMO) scenario. After formulating the task as a max-min optimization problem, we propose a semidefinite programming (SDP) based technique to maximize the minimum received...
Higher spectrum efficiency is a target of the 5th generation (5G) mobile communications system. Massive MIMO is considered as one of important technologies for that purpose. Under the practical conditions that the number of antennas on user equipment (UE) is limited, multi-user MIMO (MU-MIMO) is a probable use scenario of Massive MIMO. Furthermore, massive connectivity is another important target,...
Time-division duplexing (TDD) systems enjoy one superior characteristic referred to as channel reciprocity. However, due to different radio frequency branches for transmitting and receiving, calibrating the antenna array at the base station (BS) is necessary to effect this reciprocity between the end-to-end downlink (DL) and uplink (UL) channels. As the array size gets large in massive multi-input...
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