Results 21 to 30 of about 4,474,307 (216)
Sensors, 2018 Non-orthogonal multiple access (NOMA) systems are being considered as candidates for 5G wireless systems due to their promise of improved spectral efficiency.
Jayanta Datta, Hsin-Piao Lin
doaj +1 more source
Photonics, 2022 Orbital angular momentum (OAM) with mutually orthogonal advantage attribute to break through the high capacity and long-reach transmission limited in the classical passive optical network (PON). Employing Laguerre Gaussian (LG) mode as the orthogonal OAM
Qingan Ding +8 more
doaj +1 more source
Understanding the effects of phase noise in orthogonal frequency division multiplexing (OFDM) [PDF]
IEEE Transactions on Broadcasting, 2001 Phase noise must be carefully considered when designing an OFDM-based communication system since an accurate prediction of the tolerable phase noise can allow the system and RF engineers to relax specifications. This paper analyzes the performance of OFDM systems under phase noise and its dependence on the number of sub-carriers both in the presence ...
openaire +3 more sources
OFDM transmission scheme with subcarrier supply index modulation
Tongxin xuebao, 2023 To address the drawback that subcarrier activation pattern (SAP) of the orthogonal frequency division multiplexing with index modulation (OFDM-IM) cannot match the binary numbers which affects the system performance, the orthogonal frequency division ...
Yi GUO +3 more
doaj +2 more sources
Sparse Orthogonal Circulant Transform Multiplexing for Coherent Optical Fiber Communication
IEEE Photonics Journal, 2018 This paper introduces a new multicarrier system, named sparse orthogonal circulant transform multiplexing (S-OCTM), for optical fiber communication. This technique uses an inverse sparse orthogonal circulant transform (S-OCT) matrix, which is simple and ...
Yukui Yu +4 more
doaj +1 more source
Principles，technologies and challenges of OQAM-OFDM for 5G applications
Dianxin kexue, 2016 5G will need to be able to support much larger connections of communication devices and meet the requirements of diverse scenarios.However，this requirement cannot be met by OFDM（orthogonal frequency division multiplexing）due to its own drawbacks.As an ...
Jun LI +4 more
doaj +2 more sources
Robust time synchronization for NC-OFDM cognitive radio systems
Journal of King Saud University: Computer and Information Sciences, 2022 In this paper, we propose a time-synchronization method for non-contiguous orthogonal frequency division multiplexing (NC-OFDM) systems. NC-OFDM is a modulation and multiplexing technique that is often used for cognitive radio (CR) systems. In OFDM-based
Suyoto Suyoto +3 more
doaj +1 more source
, 2001 The effect of time-domain and frequency-domain synchronization errors is quantified in the context of various coherently and noncoherently detected 1, 2, and 4 bits/symbol OFDM constellations, in order to demonstrate the wide applicability of the ...
Piazzo, L. +7 more
core +1 more source
Terahertz Channel Modeling, Estimation and Localization in RIS‐Assisted Systems
Advanced Electronic Materials, EarlyView.Reconfigurable intelligent surfaces have become a recent intensive research focus. Based on practical applications, channel strategies for RIS‐assisted terahertz wireless communication systems are categorized into three different types: channel modeling, channel estimation, and channel localization.
Hongjing Wang +9 more
wiley +1 more source
International Journal of Satellite Communications and Networking, Volume 44, Issue 6, Page 689-699, November/December 2026.ABSTRACT In this paper, the correlation learning estimation and adaptive reduction (CLEAR) of interference, an adaptive, blind and transparent interference compensation method applied in a wideband dual‐channel receiver, is studied for a pair of independent satellite multi‐connectivity links, using the same carrier frequency and signal bandwidth in use
Svilen Dimitrov
wiley +1 more source