Results 31 to 40 of about 65,120 (254)
Towards Very Large Aperture Massive MIMO: a measurement based study [PDF]
, 2014 Massive MIMO is a new technique for wireless communications that claims to offer very high system throughput and energy efficiency in multi-user scenarios. The cost is to add a very large number of antennas at the base station.
De Carvalho, Elisabeth +2 more
core +3 more sources
IEEE AccessEach generation of mobile communications introduces new frequency spectrums and new communication systems to increase user’s experienced data rates.
Kin-Lu Wong +3 more
doaj +1 more source
Cost Reduction and Channel Capacity Enhancement of MIMO System Using Antenna Selection Techniques [PDF]
International Journal of Electronics and Telecommunications, 2019 MIMO technology has become very popular in a wireless communication system because of the many advantages of multiple antennas at the transmitting end and receiving end.
Dalveer Kaur, Neeraj Kumar
doaj +1 more source
Millimeter Wave Communications with Reconfigurable Antennas
, 2018 The highly sparse nature of propagation channels and the restricted use of radio frequency (RF) chains at transceivers limit the performance of millimeter wave (mmWave) multiple-input multiple-output (MIMO) systems. Introducing reconfigurable antennas to
He, Biao, Jafarkhani, Hamid
core +1 more source
Secure Degrees of Freedom of MIMO X-Channels with Output Feedback and Delayed CSIT [PDF]
, 2013 We investigate the problem of secure transmission over a two-user multi-input multi-output (MIMO) X-channel in which channel state information is provided with one-unit delay to both transmitters (CSIT), and each receiver feeds back its channel output to
Abdellatif Zaidi +4 more
core +6 more sources
Massive MIMO With Dual-Polarized Antennas
IEEE Transactions on Wireless Communications, 2023 This paper considers a single-cell massive MIMO (multiple-input multiple-output) system with dual-polarized antennas at both the base station and users. We study a channel model that includes the key practical aspects that arise when utilizing dual-polarization: channel cross-polar discrimination (XPD) and cross-polar correlations (XPC) at the ...
Ozgecan Ozdogan, Emil Bjornson
openaire +2 more sources
Scalability of MIMO Antennas: Assessing Gain and HPBW for Different Antenna Element Configurations
Jurnal Rekayasa ElektrikaThe design of Massive MIMO Antennas presents challenges due to their large size, which can impede the design process. Additionally, the arrangement of multiple antenna elements in Massive MIMO Antennas poses a challenge, as it surpasses the capabilities ...
Salwa Salsabila +3 more
doaj +1 more source
Intelligent Surface-Aided Transmitter Architectures for Millimeter-Wave Ultra Massive MIMO Systems
IEEE Open Journal of the Communications Society, 2021 In this article, we study two novel massive multiple-input multiple-output (MIMO) transmitter architectures for millimeter wave (mmWave) communications which comprise few active antennas, each equipped with a dedicated radio frequency (RF) chain, that ...
Vahid Jamali +4 more
doaj +1 more source
On X-Channels with Feedback and Delayed CSI
, 2012 The sum degrees of freedom (DoF) of the two-user MIMO X-channel is characterized in the presence of output feedback and delayed channel state information (CSI).
Mohajer, Soheil +3 more
core +1 more source
Effect of pedestrian movement on MIMO-OFDM channel capacity in an indoor environment [PDF]
, 2009 Effects of pedestrian movement on multiple-input multiple-output orthogonal frequency division multiplexing (MIMO-OFDM) channel capacity have been investigated using experiment and simulation. The experiment was conducted at 5.2 GHz by a MIMO-OFDM packet
Das Gupta, Jishu +2 more
core +2 more sources