Results 1 to 10 of about 293,784 (75)

Mitigating Pilot Contamination and Enabling IoT Scalability in Massive MIMO Systems [PDF]

GLOBECOM 2023 - 2023 IEEE Global Communications Conference, 2023
Massive MIMO is expected to play an important role in the development of 5G networks. This paper addresses the issue of pilot contamination and scalability in massive MIMO systems. The current practice of reusing orthogonal pilot sequences in adjacent cells leads to difficulty in differentiating incoming inter- and intra-cell pilot sequences.
arxiv   +1 more source

Contention-based Grant-free Transmission with Extremely Sparse Orthogonal Pilot Scheme [PDF]

arXiv, 2021
Due to the limited number of traditional orthogonal pilots, pilot collision will severely degrade the performance of contention-based grant-free transmission. To alleviate the pilot collision and exploit the spatial degree of freedom as much as possible, an extremely sparse orthogonal pilot scheme is proposed for uplink grant-free transmission.
arxiv  

Channel Charting Aided Pilot Reuse for Massive MIMO Systems with Spatially Correlated Channels [PDF]

, 2022
Massive multiple-input multiple-output (mMIMO) technology is a way to increase the spectral efficiency of machine-type communications (MTC). To exploit the benefits from large antenna arrays, accurate channel estimation through pilot signals is needed. Massive MTC systems cannot avoid pilot reuse due to the enormous numbers of connected devices.
arxiv   +1 more source

Joint Pilot Design and Channel Estimation using Deep Residual Learning for Multi-Cell Massive MIMO under Hardware Impairments [PDF]

arXiv, 2021
In multi-cell massive MIMO systems, channel estimation is deteriorated by pilot contamination and the effects of pilot contamination become more severe due to hardware impairments. In this paper, we propose a joint pilot design and channel estimation based on deep residual learning in order to mitigate the effects of pilot contamination under the ...
arxiv  

An Adaptive Pilot Model with Reaction Time-Delay [PDF]

arXiv, 2022
Practical adaptive control implementations where human pilots coexist in the loop are still uncommon, despite their success in handling uncertain dynamical systems. This is owing to their special nonlinear characteristics which lead to unfavorable interactions between pilots and adaptive controllers.
arxiv  

On the Pilot Contamination Attack in Multi-Cell Multiuser Massive MIMO Networks [PDF]

IEEE Transactions on Communications, 2020, 2020
In this paper, we analyze pilot contamination (PC) attacks on a multi-cell massive multiple-input multiple-output (MIMO) network with correlated pilots. We obtain correlated pilots using a user capacity-achieving pilot sequence design. This design relies on an algorithm which designs correlated pilot sequences based on signal-to-interference-plus-noise
arxiv   +1 more source

From Novice to Skilled: RL-based Shared Autonomy Communicating with Pilots in UAV Multi-Task Missions [PDF]

, 2023
Multi-task missions for unmanned aerial vehicles (UAVs) involving inspection and landing tasks are challenging for novice pilots due to the difficulties associated with depth perception and the control interface. We propose a shared autonomy system, alongside supplementary information displays, to assist pilots to successfully complete multi-task ...
arxiv   +1 more source

Adaptive Pilot Clustering in Heterogeneous Massive MIMO Networks [PDF]

, 2015
We consider the uplink of a cellular massive MIMO network. Acquiring channel state information at the base stations (BSs) requires uplink pilot signaling. Since the number of orthogonal pilot sequences is limited by the channel coherence, pilot reuse across cells is necessary to achieve high spectral efficiency.
arxiv   +1 more source

Exploiting Spatial Correlation for Pilot Reuse in Single-Cell mMTC [PDF]

arXiv, 2021
As a key enabler for massive machine-type communications (mMTC), spatial multiplexing relies on massive multiple-input multiple-output (mMIMO) technology to serve the massive number of user equipments (UEs). To exploit spatial multiplexing, accurate channel estimation through pilot signals is needed.
arxiv  

On Hybrid Pilot for Channel Estimation in Massive MIMO Uplink [PDF]

arXiv, 2016
This paper introduces a hybrid pilot-aided channel estimation technique for mitigating the effect of pilot contamination for the uplink of multi-cell multiuser massive MIMO systems. The proposed hybrid pilot is designed such that it enjoys the complementary advantages between time-multiplexed (TM) pilot and time-superimposed (TS) pilot, and thereby ...
arxiv