Abstract
Even though, Massive MIMO (M-MIMO) technology offers good improvement in terms of performance and quality of communications between users and Base Stations (BS). This technology, still limited by a harmful constraint renowned Pilot Contamination (PC) problem. To beat this problem of PC, two approaches have been adapted as a medicine for this problem, which appears strongly in Multi-Cell M-MIMO systems. The first approach is based on assigning extra pilot sequences to different users, while the second approach obliges the reuse of the same set of pilots in different cells. This paper reviews, briefly, the problem of PC in M-MIMO systems. Thereafter, it analyzes and provides a comparison between two decontaminating strategies: the Soft Pilot Reuse (SPR) and the Pilot Assignment based on the Weighted Graph Coloring (WGC-PA), which are respectively based on the above-discussed approaches. The analysis presented in this paper is focused on the uplink phase (i.e reverse link).
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Belhabib, A., Boulouird, M., Hassani, M.M. (2020). Pilot Assignment vs Soft Pilot Reuse to Surpass the Pilot Contamination Problem: A Comparative Study in the Uplink Phase. In: Belkasmi, M., Ben-Othman, J., Li, C., Essaaidi, M. (eds) Advanced Communication Systems and Information Security. ACOSIS 2019. Communications in Computer and Information Science, vol 1264. Springer, Cham. https://doi.org/10.1007/978-3-030-61143-9_1
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