Results 61 to 70 of about 22,554 (188)
Using OFDMA for MU-MIMO User Selection in 802.11ax-Based Wi-Fi Networks
IEEE Access, 2019 Two innovative multi-user (MU) communication mechanisms, multi-user multi-input multi-output (MU-MIMO) and orthogonal frequency division multiple access (OFDMA), have recently attracted much attention as key technologies to boost the capabilities of 802 ...
Kyu-Haeng Lee
doaj +1 more source
Secure Uplink IM-OFDMA With Artificial IQ Imbalance
IEEE Access, 2023 This study proposes a novel secure uplink index modulation-based orthogonal frequency division multiple access (IM-OFDMA) systems using artificial in-phase and quadrature imbalance (A-IQI).
Ozgur Alaca +4 more
doaj +1 more source
, 2011 We consider the problem of simultaneous user-scheduling, power-allocation, and rate-selection in an OFDMA downlink, with the goal of maximizing expected sum-utility under a sum-power constraint.
Aggarwal, Rohit +3 more
core +2 more sources
A Survey on Delay-Aware Resource Control for Wireless Systems --- Large Deviation Theory, Stochastic Lyapunov Drift and Distributed Stochastic Learning [PDF]
, 2011 In this tutorial paper, a comprehensive survey is given on several major systematic approaches in dealing with delay-aware control problems, namely the equivalent rate constraint approach, the Lyapunov stability drift approach and the approximate Markov ...
Cui, Ying +4 more
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Transactions on Emerging Telecommunications Technologies, Volume 36, Issue 7, July 2025.We introduce a novel model of an IRS‐assisted MU‐MISO‐OFDMA system. We aim to jointly optimize beamforming vectors, IRS reflection coefficients, and OFDM subcarrier allocation to maximize the overall sum rate. ABSTRACT In this article, we propose a novel resource allocation strategy for multiuser multiple‐input single‐output orthogonal frequency ...
Binh‐Minh Vu, Oh‐Soon Shin
wiley +1 more source
Cross-layer design for single-cell OFDMA systems with heterogeneous QoS and partial CSIT [PDF]
, 2009 — This paper proposes a novel cross-layer scheduling scheme for a single-cell orthogonal frequency division multiple access (OFDMA) wireless system with partial channel state information (CSI) at transmitter (CSIT) and heterogeneous user delay ...
Ni, Q, Skordoulis, D, Zarakovitis, C
core +1 more source
Green communication systems via a wavefront multiplexing technique
Systems Engineering, Volume 28, Issue 1, Page 5-14, January 2025.Abstract A green communication scheme using an orthogonal wavefront (WF) multiplexing (Muxing) scheme spatially combined with orthogonal frequency‐division multiplexing (OFDM) techniques is proposed. It forms a spatial WF OFDM transceiver. The WF Muxing technique serves as the preprocessing and postprocessing method of the WF OFDM transceiver.
Hen‐Geul Yeh, Joe Lee
wiley +1 more source
Yeni Nesil Kablosuz Ağ Teknolojisi: Wimax Standardının İncelenmesi
Düzce Üniversitesi Bilim ve Teknoloji Dergisi, 2016 Wimax (Worldwide Interoperability for Microwave Access) teknolojisi, Wimax Forum tarafından çeşitli standartları geliştirilen, geniş alanda iletişim sağlayan bir kablosuz ağ teknolojisidir. Çalışma boyunca Wimax hakkında bilgi verilmiştir.
Arafat Şentürk +4 more
doaj
ENHANCEMENT OF CODE DIVISION MULTIPLE ACCESS (CDMA) WITHIN THE GSM SYSTEM IN IRAQ
Mağallaẗ Al-kūfaẗ Al-handasiyyaẗDespite the widespread adoption of Global System for Mobile Communications (GSM) in Iraq, the network's capacity and performance limitations have become increasingly apparent, particularly in urban areas with high user density. Currently, LTE (4G) is the
Nabil Abdulwahab Abdulrazaq Baban
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Open vs Closed Access Femtocells in the Uplink
, 2010 Femtocells are assuming an increasingly important role in the coverage and capacity of cellular networks. In contrast to existing cellular systems, femtocells are end-user deployed and controlled, randomly located, and rely on third party backhaul (e.g ...
Andrews, Jeffrey G. +2 more
core +1 more source