On Reusing Pilots Among Interfering Cells in Massive MIMO

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Pilot contamination, caused by the reuse of pilots among interfering cells, remains a significant obstacle that limits the performance of massive multi-input multi-output antenna systems. To handle this problem, less aggressive reuse of pilots involving allocation of additional pilots for interfering users is closely examined in this paper. Hierarchical pilot reuse methods are proposed, which effectively mitigate pilot contamination and increase the net throughput of the system. Among the suggested hierarchical pilot reuse schemes, the optimal way of assigning pilots to different users is obtained in a closed-form solution, which maximizes the net sum-rate in a given coherence time. Simulation results confirm that when the ratio of the channel coherence time to the number of users in each cell is sufficiently large, less aggressive reuse of pilots yields significant performance advantage relative to the case, where all cells reuse the same pilot set.
Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
Issue Date
2017-12
Language
English
Article Type
Article
Keywords

ANTENNA SYSTEMS; WIRELESS; NETWORKS; 5G; CONTAMINATION; ALLOCATION; EFFICIENCY

Citation

IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS, v.16, no.12, pp.8092 - 8104

ISSN
1536-1276
DOI
10.1109/TWC.2017.2756927
URI
http://hdl.handle.net/10203/238795
Appears in Collection
EE-Journal Papers(저널논문)
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