Pilot assigning strategy in massive MIMO system = 초다중 안테나 시스템에서의 파일럿 배정방법

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The pilot reuse issue in massive multi-input multi-output (MIMO) antenna systems with interfering cells is closely examined. This paper considers scenarios where the ratio of the channel coherence time to the number of users in a cell may be sufficiently large. One such practical scenario arises when the number of users per unit coverage area cannot grow freely while user mobility is low, as in indoor networks. Another important scenario is when the service provider is interested in guaranteeing a maximum sum rate over some subset of users rather than over all users in the cell. A sum-rate comparison analysis shows that in such scenarios less aggressive reuse of pilots involving allocation of additional pilots for interfering users yields significant performance advantage relative to the case where all cells reuse the same pilot set. For a given ratio of the normalized coherence time interval to the number of users per cell, the optimal pilot assignment strategy is revealed via a closed-form solution and the resulting net sum-rate is compared with that of the full pilot reuse. Moreover, in a practical scenario of prioritized user groups similar analysis is performed for maximizing net weighted-sum-rate, which reinforces the necessity of appropriate pilot assigning strategy.
Advisors
Moon, Jaekyunresearcher문재균researcher
Description
한국과학기술원 :전기및전자공학부,
Publisher
한국과학기술원
Issue Date
2016
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 전기및전자공학부, 2016.2 ,[v, 56 p. :]

Keywords

MIMO; Massive MIMO; Pilot contamination; Pilot assignment; Channel estimation; 다중안테나; 초다중안테나; 파일럿 오염효과; 파일럿 배정; 채널 추정

URI
http://hdl.handle.net/10203/221717
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=649620&flag=dissertation
Appears in Collection
EE-Theses_Master(석사논문)
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