Results 41 to 50 of about 30,726 (232)
EURASIP Journal on Wireless Communications and Networking, 2009 The problem of multiservice transmission in OFDMA-based cooperative relay networks is studied comprehensively. We propose a framework to adaptively allocate power, subcarriers, and data rate in OFDMA system to maximize spectral efficiency under the ...
Wenbo Wang, Shuping Chen, Xing Zhang
doaj +2 more sources
A NEW DISCRETE HARTLEY TRANSFORM PRECODING BASED INTERLEAVED-OFDMA UPLINK SYSTEM WITH REDUCED PAPR FOR 4G CELLULAR NETWORKS [PDF]
Journal of Engineering Science and Technology, 2011 High peak-to-average power ratio (PAPR) reduction is one of the major challenges in orthogonal frequency division multiple access (OFDMA) systems since last decades. High PAPR increases the complexity of analogue-to-digital (A/D) and digital-to-analogue (
VARUN JEOTI, IMRAN BAIG
doaj
An Efficient Backoff Procedure for IEEE 802.11ax Uplink OFDMA-Based Random Access
IEEE Access, 2022 IEEE 802.11ax stations can use multi-user (MU) uplink OFDMA-based random access (UORA) to improve per-station throughput in dense deployments in comparison to legacy IEEE 802.11 single-user access.
Katarzyna Kosek-Szott, Krzysztof Domino
doaj +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
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Adaptive Video Transmission for OFDMA Systems [PDF]
Multimedia and Expo, 2007 IEEE International Conference on, 2007 An adaptive framework is proposed for multi-user video transmission over orthogonal frequency division multiple access (OFDMA) systems. Utilizing the channel knowledge, a two-step heuristic sub-carrier assignment algorithm is proposed to achieve unequal error protection for the video data.
Shen, D, Li, VOK, Yang, GH
openaire +2 more sources
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
Multicast broadcast services support in OFDMA-based WiMAX systems [Advances in mobile multimedia] [PDF]
, 2007 Multimedia stream service provided by broadband wireless networks has emerged as an important technology and has attracted much attention. An all-IP network architecture with reliable high-throughput air interface makes orthogonal frequency division ...
Chen, HH, Jiang, T, Ni, Q, Xiang, W
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Robust Spectral and Energy Efficiency Tradeoff for RIS‐Aided Multi‐User Communication
IET Communications, Volume 20, Issue 1, January/December 2026.In this work, an RIS‐aided multi‐user network with imperfect CSI is investigated. Correspondingly, we focus on balancing SE and EE through the collaborative design of the base station (BS)'s precoding matrix and the RIS's phase shifts, which consider the transmit power budget and the channel uncertainties constraints.
Xiandeng He, Yilin Wang, Shun Zhang
wiley +1 more source
Energy-Efficient OFDM Radio Resource Allocation Optimization With Computational Awareness: A Survey
IEEE Access, 2022 In this paper, we review radio resource optimization methods for energy-efficient wireless communication in links and networks using the Orthogonal Frequency Division Multiplexing (OFDM) and Orthogonal Frequency Division Multiple Access (OFDMA ...
Bartosz Bossy +2 more
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Artificial Noise Aided Secrecy Information and Power Transfer in OFDMA Systems
, 2016 In this paper, we study simultaneous wireless information and power transfer (SWIPT) in orthogonal frequency division multiple access (OFDMA) systems with the coexistence of information receivers (IRs) and energy receivers (ERs).
Liu, Yuan, Zhang, Meng, Zhang, Rui
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