Abstract
Despite the large benefits that can be fulfilled through the exploitation of Massive Multi-input Multioutput (M-MIMO), this technology still constrained by a well-known constraint, called as pilot contamination problem (PCP), which is the main consequence of, simultaneously, reusing the same set of orthogonal pilot sequences (OPSs) for the users of several cells. Due to the scarcity of the OPS resources, the reuse of the same set of the OPSs for the users of different cells is unavoidable. Hence, this work proposes a novel decontaminating strategy, which is aimed at guaranteeing a trade-off between the use of the OPSs and the mitigation of the PCP. Specifically, to make the use of the available OPSs better, we propose the consolidation of two powerful decontaminating strategies. Under a derived supervision rule (SR), these strategies are the soft pilot reuse-based multicell block diagonalization precoding (SPR-MBDP) and the weighted graph coloring-based pilot assignment (WGC-PA). The SR enables the switching mechanism between the two strategies, which leads to address the PCP with a fewer number of the OPSs compared to the SPR-MBDP, therefore boosting the per-cell achievable rate. Simulation results prove the effectiveness of our proposed strategy.
Highlights
Massive Multi-input Multioutput (M-MIMO) technology was introduced in 2010 by [1], and it is aimed at serving, simultaneously, tens of the users (K user per cell)
A soft pilot reuse-based multicell block diagonalization precoding (SPR-MBDP) was proposed in [9], which suggests selecting the edge users of the overall cells; each one of the selected users is assigned with a unique orthogonal pilot sequences (OPSs), while the center users of the overall cells are obliged to reuse the same set of the OPSs; by exploiting the singular value decomposition (SVD) tool, data symbols are scheduled toward the target users
In the existing decontaminating strategies, less attention has been paid to the problem of pilot overhead, which is—without any doubt—a crucial side that must be respected in any proposed decontaminating strategy; stand from that remark, this paper provides a new decontaminating strategy to boost the performance of the M-MIMO
Summary
M-MIMO technology was introduced in 2010 by [1], and it is aimed at serving, simultaneously, tens of the users (K user per cell) This is by employing a massive number (i.e., hundreds) of antennas (i.e., M antennas) at the Base Stations (BSs). A soft pilot reuse-based multicell block diagonalization precoding (SPR-MBDP) was proposed in [9], which suggests selecting the edge users of the overall cells; each one of the selected users is assigned with a unique OPSs, while the center users of the overall cells are obliged to reuse the same set of the OPSs (i.e., full pilot reuse); by exploiting the singular value decomposition (SVD) tool, data symbols are scheduled toward the target users. The Frobenius norm of a matrix is denoted as k:kF
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