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massive-multiple-input--multiple-output-system--mimo
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A high-throughput low-complexity VLSI architecture for ZF precoding in massive MIMO
, Article IEEE International Workshop on Computer Aided Modeling and Design of Communication Links and Networks, CAMAD, 19 June 2017 through 21 June 2017 ; Volume 2017-June , 2017 ; 23784873 (ISSN) ; 9781509063024 (ISBN) ; Shabany, M ; Nezamalhosseini, S. A ; Emadi, M. J ; Sharif University of Technology
Abstract
In this work we present a high-throughput, low-complexity design for linear precoding in massive Multiple-Input Multiple-Output (MIMO) systems. Large number of Base Station (BS) antennas in massive MIMO at one hand has caused the performance of linear precoders to be near-optimal and at the other hand has increased their complexity due to the need for the inversion of matrices with large dimensions. To avoid this complexity, approximate inversion methods based on Neumann Series have been proposed. However, in this work, we propose an architecture for Zero Forcing (ZF) precoder based on the Neumann Series approximate inversion that further reduces the complexity by replacing matrix-matrix...
Massive MIMO-NOMA systems secrecy in the presence of active eavesdroppers
, Article 30th International Conference on Computer Communications and Networks, ICCCN 2021, 19 July 2021 through 22 July 2021 ; Volume 2021-July , 2021 ; 10952055 (ISSN); 9780738113302 (ISBN) ; Mirmohseni, M ; Papadimitratos, P ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2021
Abstract
Non-orthogonal multiple access (NOMA) and massive multiple-input multiple-output (MIMO) systems are highly efficient. Massive MIMO systems are inherently resistant to passive attackers (eavesdroppers), thanks to transmissions directed to the desired users. However, active attackers can transmit a combination of legitimate user pilot signals during the channel estimation phase. This way they can mislead the base station (BS) to rotate the transmission in their direction, and allow them to eavesdrop during the downlink data transmission phase. In this paper, we analyse this vulnerability in an improved system model and stronger adversary assumptions, and investigate how physical layer security...
Differentially encoded blind multicell multiuser massive MIMO
, Article IEEE International Conference on Communication Workshop, ICCW 2015, 8 June 2015 through 12 June 2015 ; June , 2015 , Pages 1054-1059 ; 9781467363051 (ISBN) ; Khalaj, B. H ; Pesavento, M ; Sharif University of Technology
Institute of Electrical and Electronics Engineers Inc
2015
Abstract
In this paper, we consider the uplink of the narrowband multicell multiuser massive multiple-input multiple-output (MIMO) systems. In traditional approaches, orthogonal pilots among users of all (interfering) cells are utilized to estimate their channels assumed to be constant during channel coherence time. However, in multicell scenarios, such schemes suffer from pilot contamination. In order to address this issue, based on asymptotic pairwise orthogonality of the users' channels in massive regime, blind channel estimation schemes have been proposed. On the other hand, such schemes rely on low interference or high signal to noise ratio (SNR) levels, to achieve reliable performance. Inspired...