Results 331 to 340 of about 5,997,708 (388)

Modulated index structures

Journal of the Optical Society of America A, 1990
We present a brief tutorial overview of the basic physics of periodically modulated index structures and how they affect an incident electromagnetic wave in various simple limits. Discussions of the wave-vector spectrum, coupled-amplitude equations, and finite grating-size effects are included.
George I. Stegeman, Dennis G. Hall
openaire   +1 more source

Design of Non-Coherent RIS-Empowered DCSK With Two-Level Nested Index Modulation

IEEE Transactions on Wireless Communications
Non-coherent chaotic communication has gained increasing attention as it provides an efficient solution for reliable communications without requiring channel state information.
Xiangming Cai, Chongwen Huang, Pingping Chen, E. Başar, Chau Yuen   +4 more
semanticscholar   +1 more source

Performance of LoRa-Based Schemes and Quadrature Chirp Index Modulation

IEEE Internet of Things Journal, 2022
This article proposes new approximations for the bit error probability of several LoRa-based schemes, such as phase-shift keying (PSK) LoRa, in-phase and quadrature (IQ) chirp spread spectrum (CSS), discrete chirp rate keying (DCRK) CSS, and CSS with ...
G. Baruffa, L. Rugini
semanticscholar   +1 more source

Transformer-Based Detector for OFDM With Index Modulation

IEEE Communications Letters, 2022
A deep learning (DL)-based detector utilizing the Transformer framework is proposed for orthogonal frequency-division multiplexing with index modulation (OFDM-IM) systems, termed as TransIM. Concretely, TransIM adopts a two-step detection method.
Dexin Zhang, Sixian Wang, K. Niu, Jincheng Dai, Sen Wang, Yifei Yuan   +5 more
semanticscholar   +1 more source

Affine Frequency Division Multiplexing With Index Modulation: Full Diversity Condition, Performance Analysis, and Low-Complexity Detection

IEEE Journal on Selected Areas in Communications
Affine frequency division multiplexing (AFDM) is a novel modulation technique based on chirp signals that has been recently proposed as an effective solution for highly reliable communications in high-mobility scenarios.
Yiwei Tao, Miaowen Wen, Yao Ge, Jun Li, E. Başar, N. Al-Dhahir   +5 more
semanticscholar   +1 more source

Position Index Modulation for Fluid Antenna System

IEEE Transactions on Wireless Communications
Fluid antenna system (FAS) represents all forms of movable and non-movable position-flexible antenna system, and opens up the possibility of a new form of modulation schemes. In this paper, we investigate the design of position index modulation (PIM) for
Halvin Yang, Hao Xu, kai-kit Wong, Chan-Byoung Chae, Ross D. Murch, Shi Jin, Yangyang Zhang   +6 more
semanticscholar   +1 more source

Index-Modulation-Aided Terahertz Communications With Reconfigurable Intelligent Surface

IEEE Transactions on Wireless Communications
Reconfigurable intelligent surface (RIS) has drawn extensive attentions as a promising alternative for classical phased-array antennas at the massive multiple-input multiple-output (MIMO) transmitter, leading to cost-effective data transmission that is ...
Tianqi Mao, Zhen-Xiong Zhou, Zhenyu Xiao, Chong Han, Zhaocheng Wang   +4 more
semanticscholar   +1 more source

On the Capacity of Index Modulation

IEEE Transactions on Wireless Communications, 2022
Index modulation represents the transmitted information in two parts: by selecting a subset of available transmission dimensions (antennas, sub-carriers, or time-slots) whose selection index carries information, and by modulation symbols transmitted in ...
Bharath Shamasundar, Aria Nosratinia
semanticscholar   +1 more source

Windowed OFDM with Index Modulation

IEEE International RF and Microwave Conference
This paper presents a novel scheme called Windowed Orthogonal Frequency Division Multiplexing with Index Modulation (W-OFDM-IM), which integrates windowing techniques such as rectangular, Hamming, Hanning, Chebyshev, and Kaiser into OFDM-IM to mitigate ...
Ahmed Waheed, Somayeh Mohammady
semanticscholar   +1 more source

OCDM with Enhanced Index Modulation

2025 5th International Conference on Neural Networks, Information and Communication Engineering (NNICE)
This paper addresses suboptimal transmission rates in orthogonal chirp division multiplexing with index modulation (OCDM-IM) by drawing inspiration from orthogonal frequency division multiplexing with enhanced index modulation (OFDM-EIM) framework.
Xiaoyan Ning, Yuhao Shao, Zihan Tang, Qiaoling Yin   +3 more
semanticscholar   +1 more source