Results 21 to 30 of about 51,994 (258)
Automatic Vending-Machines Contamination: A Pilot Study
Global Journal of Health Science, 2016 <p>Hot-drinks vending machines are disseminated worldwide and millions of drinks are served every day. Because of a small number of studies on hot-drinks related illnesses, the aim of this pilot study was to identify the presence and load of bacterial species, potentially harmful for consumers, within hot-drinks vending machines external critical
Cardaci, R. +6 more
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Flexible Pilot Contamination Mitigation With Doppler PSD Alignment [PDF]
IEEE Signal Processing Letters, 2016 Pilot contamination in the uplink (UL) can severely degrade the channel estimation quality at the base station (BS) in a massive multi-input multi-output (MIMO) system. Thus, it is critical to explore all possible avenues to enable more orthogonal resources for the users to transmit non-interfering UL pilots.
Xiliang Luo, Xiaoyu Zhang 0005
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On the effect of imperfect timing synchronization on pilot contamination
2017 IEEE International Conference on Communications (ICC), 2017 The phenomenon of pilot contamination (PC) in multi-cell Massive MIMO systems is investigated in the presence of imperfect timing synchronization (TS). In particular, a basic setup is considered, where a base station (BS) is perfectly synchronized with the user of its cell, but there is imperfect TS between the BS and the user in another cell, possibly
Pitarokoilis, Antonios +2 more
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Pilot contamination problem in multi-cell TDD systems [PDF]
2009 IEEE International Symposium on Information Theory, 2009 This paper considers a multi-cell multiple antenna system with precoding at the base stations for downlink transmission. To enable precoding, channel state information (CSI) is obtained via uplink training. This paper mathematically characterizes the impact that uplink training has on the performance of multi-cell multiple antenna systems.
Jubin Jose +3 more
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Pilot Allocation Scheme for Pseudo-random Sequence Scrambling in Massive MIMO System
Journal of Harbin University of Science and Technology, 2021 In this paper，a scheme of joint polar coordinate pilot assignment and pseudo-random code pilot design is proposed to solve the pilot contamination caused by the reuse of the same pilot sequence in each cell of the Massive MIMO system.
HAN Zhi-yu +4 more
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An Improved Anti-Interference Precoding of Large-Scale Fading System Based on Channel Inversion
Applied Sciences, 2020 Recently, a large-scale fading precoding (LSFP) for the wireless massive multiple-input, multiple-output (MIMO) systems has been proposed. In this precoding, the channel information of all the cells using re-use pilot sequences is processed jointly, and ...
Wei Lei +4 more
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The microbial contamination of toothbrushes. A pilot study [PDF]
Australian Dental Journal, 1998 AbstractTen individuals were each supplied with a new toothbrush of the same type and brand, together with identical tubes of fluoridated toothpaste. After a three‐week period, during which subjects were asked to follow their usual oral hygiene practices, the toothbrushes were collected and assayed for microbial contamination using a range of selective
Taji, S., Rogers, A.
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Multi‐input fully CNN for joint pilot decontamination and symbol detection in 5G massive MIMO
IET Communications, 2023 This paper presents a multi‐input deep learning‐based joint pilot decontamination and symbol detection (SD) technique for 5G massive multiple‐input multiple‐output (MAMIMO) systems.
Crallet M. Victor +2 more
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Tongxin xuebao, 2017 Pilot contamination is appeared in massive MIMO (multiple input multiple output) system when using the same pilot sequences at different cells to get the channel state information.It becomes a bottleneck problem of massive MIMO when the number of antenna
Xin-lei SONG, Lin YANG, Jia-liang DU
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Detection of Pilot Contamination Attack for Frequency Selective Channels [PDF]
IEEE Access, 2020 Physical layer security (PLS) provides an additional protection layer to the conventional encryption in the presence of an active eavesdropper (Eve). The detection of pilot contamination attack (PCA) on legitimate nodes by the active Eve is vital in order to mitigate the effect of the attack. In this work, we propose a novel PCA detector for the nodes,
Awais Ahmed +3 more
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