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This paper addresses the problem of pilot power allocation between users in massive multiuser multiple-input-multiple-output (MU-MIMO) systems with heterogeneous users. By exploiting the fact that heterogeneous users can experience different path loss and shadowing degradations due to their distinct locations, this paper proposes an optimized pilot power allocation strategy for massive MIMO systems...
Pilot contamination has become a main constraint for large-scale multi-input multi-output (MIMO) systems. In this paper, we consider a large-scale multi-cell MIMO where the number of users per cell K is proportional to that of base station antennas M. Both performances with and without pilot contamination are analyzed in a quantitative way with closed-form expressions. Unlike some existing works,...
Massive multiple-input multiple-output (MIMO) is envisioned to offer considerable capacity improvement, but at the cost of high complexity of the hardware. In this paper, we propose a low-complexity hybrid precoding scheme to approach the performance of the traditional baseband zero-forcing (ZF) precoding (referred to as full-complexity ZF), which is considered a virtually optimal linear precoding...
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