Partial Overlapped Time-Shifted Pilots for Massive MIMO Systems

This letter proposes a partial-time-shifted pilot scheme to find a better tradeoff between the user accommodation and orthogonality of pilots for the massive multiple-input multiple-output system. To this end, the pilot symbols rather than the pilot sequences are applied. In addition, the neighborin...

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Bibliographic Details
Published in:IEEE communications letters 2017-11, Vol.21 (11), p.2480-2483
Main Authors: Chang, Wenson, Hua, Yun-Kuei, Liao, Shu-Fong
Format: Article
Language:English
Subjects:
Contamination
Downlink
Fading channels
fractional pilot reuse
Interference
Massive MIMO
MIMO
partial time-shifted pilot
pilot contamination
Signal to noise ratio
time-shifted pilot
Uplink
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Summary:This letter proposes a partial-time-shifted pilot scheme to find a better tradeoff between the user accommodation and orthogonality of pilots for the massive multiple-input multiple-output system. To this end, the pilot symbols rather than the pilot sequences are applied. In addition, the neighboring cells are allowed to transmit the pilot signals using the overlapped symbol periods. Despite the stronger interference, the larger user accommodation as well as the near-far effect incurred by using the pilot symbols can contribute to the higher sum transmission rates for both the uplink and downlink cases.
ISSN:1089-7798
1558-2558
DOI:10.1109/LCOMM.2017.2734766