Results 11 to 20 of about 293,784 (75)

On Reusing Pilots Among Interfering Cells in Massive MIMO [PDF]

arXiv, 2017
Pilot contamination, caused by the reuse of pilots among interfering cells, remains as 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 ...
arxiv  

P*: A Model of Pilot-Abstractions [PDF]

arXiv, 2012
Pilot-Jobs support effective distributed resource utilization, and are arguably one of the most widely-used distributed computing abstractions - as measured by the number and types of applications that use them, as well as the number of production distributed cyberinfrastructures that support them.
arxiv  

Pilot Optimization and Channel Estimation for Multiuser Massive MIMO Systems [PDF]

arXiv, 2014
This paper proposes novel pilot optimization and channel estimation algorithm for the downlink multiuser massive multiple input multiple output (MIMO) system with $K$ decentralized single antenna mobile stations (MSs), and time division duplex (TDD) channel estimation which is performed by utilizing $N$ pilot symbols.
arxiv  

Pilot Decontamination Through Pilot Sequence Hopping in Massive MIMO Systems [PDF]

arXiv, 2015
This work concerns wireless cellular networks applying massive multiple-input multiple-output (MIMO) technology. In such a system, the base station in a given cell is equipped with a very large number (hundreds or even thousands) of antennas and serves multiple users. Estimation of the channel from the base station to each user is performed at the base
arxiv  

Random-Training-Assisted Pilot Spoofing Detection and Secure Transmission [PDF]

arXiv, 2016
The pilot spoofing attack is considered as an active eavesdropping activity launched by an adversary during the reverse channel training phase. By transmitting the same pilot signal as the legitimate user, the pilot spoofing attack is able to degrade the quality of legitimate transmission and, more severely, facilitate eavesdropping.
arxiv  

Contention-based Grant-free Transmission with Independent Multi-pilot Scheme [PDF]

arXiv, 2020
Contention-based grant-free transmission is very promising for future massive machine-type communication (mMTC). In contention-based transmission, the random pilot collision is a challenging problem. To solve this problem, multiple pilots scheme is used to reduce the pilot collision probabliltiy.
arxiv  

Joint Pilot Design and Uplink Power Allocation in Multi-Cell Massive MIMO Systems [PDF]

arXiv, 2017
This paper considers pilot design to mitigate pilot contamination and provide good service for everyone in multi-cell Massive multiple input multiple output (MIMO) systems. Instead of modeling the pilot design as a combinatorial assignment problem, as in prior works, we express the pilot signals using a pilot basis and treat the associated power ...
arxiv  

Spectral and Energy Efficiency of Superimposed Pilots in Uplink Massive MIMO [PDF]

arXiv, 2017
Next generation wireless networks aim at providing substantial improvements in spectral efficiency (SE) and energy efficiency (EE). Massive MIMO has been proved to be a viable technology to achieve these goals by spatially multiplexing several users using many base station (BS) antennas.
arxiv  

A Comprehensive Perspective on Pilot-Job Systems [PDF]

arXiv, 2015
Pilot-Job systems play an important role in supporting distributed scientific computing. They are used to consume more than 700 million CPU hours a year by the Open Science Grid communities, and by processing up to 1 million jobs a day for the ATLAS experiment on the Worldwide LHC Computing Grid. With the increasing importance of task-level parallelism
arxiv  

Enhanced Channel Estimation in Massive MIMO via Coordinated Pilot Design [PDF]

arXiv, 2019
Pilot contamination is a limiting factor in multicell massive multiple-input multiple-output (MIMO) systems because it can severely impair channel estimation. Prior works have suggested coordinating pilot design across cells in order to reduce the channel estimation error caused by pilot contamination. In this paper, we propose a method for coordinated
arxiv