Results 41 to 50 of about 2,794,451 (217)
Performance evaluation of channel estimation techniques for a mobile fourth generation wide area OFDM system [PDF]
, 2002 In this paper channel estimation techniques for a mobile fourth generation coherent orthogonal frequency division multiplexing (OFDM) system are proposed. Coherent detection dictates that a per-subband estimate of the frequency response of the channel is
Nix, AR +5 more
core +1 more source
OFDM With Hybrid Number and Index Modulation
IEEE Access, 2020 A novel transmission scheme is introduced for efficient data transmission by conveying additional information bits through jointly changing the index and number of active subcarriers within each orthogonal frequency division multiplexing (OFDM) subblock.
Ahmad M. Jaradat +2 more
doaj +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
IM-OFDM ISAC Outperforms OFDM ISAC by Combining Multiple Sensing Observations
IEEE Open Journal of Vehicular TechnologyIndex Modulated Orthogonal Frequency-Division Multiplexing (IM-OFDM) based Integrated Sensing and Communication (ISAC) is potentially capable of outperforming Orthogonal Frequency-Division Multiplexing (OFDM) ISAC, since Index Modulation (IM ...
Hugo Hawkins +3 more
doaj +1 more source
New Signal Constellation Pairs for the ZTM-OFDM-IM System [PDF]
Wireless Communications and Mobile Computing, 2020 In this paper, we investigate new signal constellation pairs for mapping active subcarriers of the zero-padded trimode orthogonal frequency division multiplexing with index modulation (ZTM-OFDM-IM) systems. In the presented system, one of a constellation pair is the same as the one used in the previous work, and the other is a constellation larger than
Shuang Li, Seog Geun Kang
openaire +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
, 2007 Orthogonal Frequency Division Multiplexing (OFDM) has been employed in numerous wireless standards. However, the performance of OFDM systems is degraded by both the Carrier Frequency Offset (CFO) and the Phase Estimation Error (PER).
Liu, X., Hanzo, L.
core +2 more sources
Low-Complexity Suboptimal ML Detection for OFDM-IM Systems
IEEE Wireless Communications Letters, 2023 Orthogonal frequency division multiplexing with index modulation (OFDM-IM) is a novel multicarrier scheme, which uses the k out of n subcarriers as active subcarriers to transmit data. For detecting the subcarrier activation pattern (SAP) at the receiver, maximum likelihood (ML) detection cannot be used because of its high computational complexity ...
openaire +2 more sources
An Optimized SLM for PAPR Reduction in Non-coherent OFDM-IM [PDF]
IEEE Wireless Communications Letters, 2020 5 pages, 1 ...
Sarath Gopi, Sheetal Kalyani
openaire +2 more sources
Advanced Intelligent Systems, Volume 8, Issue 9, September 2026.The phase discontinuity problem—where the cyclic nature of phase angles causes catastrophic errors near the ±π boundary—is a fundamental obstacle in learning‐based reconfigurable intelligent surface (RIS) optimization. A phase‐aware hybrid CNN–LSTM framework resolves this by decomposing phase predictions into sine–cosine components, mapping circular ...
Seda Savaşçı Şen +3 more
wiley +1 more source