Results 11 to 20 of about 5,341,111 (402)
Switching management in couplers with biharmonic longitudinal modulation of refractive index [PDF]
Optics Letters 34, 3544 (2009), 2009 We address light propagation in couplers with longitudinal biharmonic modulation of refractive index in neighboring channels. While simplest single-frequency out-of-phase modulation allows suppression of coupling for strictly defined set of resonant frequencies, the addition of modulation on multiple frequency dramatically modifies the structure of ...
Ablowitz +24 more
arxiv +3 more sources
Power-dependent shaping of vortex solitons in optical lattices with spatially modulated nonlinear refractive index [PDF]
Optics Letters 33, 2173 (2008), 2008 We address vortex solitons supported by optical lattices featuring modulation of both the linear and nonlinear refractive indices. We find that when the modulation is out-of-phase the competition between both effects results in remarkable shape transformations of the solitons which profoundly affect their properties and stability.
Abdullaev +21 more
arxiv +3 more sources
Vector OFDM With Index Modulation
IEEE Access, 2017 The concept of index modulation (IM) has gained increased attention in recent years. As a member of the IM family, orthogonal frequency division multiplexing with index modulation (OFDM-IM), which is able to convey additional information bits using the ...
Yun Liu +4 more
doaj +3 more sources
A Novel Index Modulation Dimension Based on Filter Domain: Filter Shapes Index Modulation [PDF]
IEEE Transactions on Communications, 2020 A novel domain for Index Modulation (IM) named “Filter Domain” is proposed. This new domain generalizes many existing modulations and IM domains. In addition, a novel scheme “Filter Shape Index Modulation” (FSIM) is proposed.
Majed Saad +4 more
semanticscholar +6 more sources
Modulation of negative index metamaterials in the near-IR range [PDF]
, 2007 Optical modulation of the effective refractive properties of a "fishnet" metamaterial with a Ag/Si/Ag heterostructure is demonstrated in the near-IR range and the associated fast dynamics of negative refractive index is studied by pump-probe method ...
Evgenia Kim +7 more
openalex +3 more sources
Subcarrier-Index Modulation Aided OFDM - Will It Work?
IEEE Access, 2016 The achievable performance of subcarrier-index modulation (SIM) is analyzed in terms of its minimum Euclidean distance, constrained and unconstrained average mutual information, as well as its peak-to-average power ratio (PAPR).
Naoki Ishikawa +2 more
doaj +2 more sources
Index and Composition Modulation [PDF]
IEEE Communications Letters, 2021 In this paper, we propose a novel modulation concept which we call \emph{index and composition modulation (ICM)}. In the proposed concept, we use indices of active/deactive codeword elements and compositions of an integer to encode information. In this regard, we first determine the activated codeword elements, then we exploit energy levels of these ...
Ferhat Yarkin, Justin P. Coon
openaire +4 more sources
IEEE Communications Letters, 2021 5 pages, submitted for ...
Sultan Aldirmaz-Colak +4 more
openaire +8 more sources
FRaC: FMCW-Based Joint Radar-Communications System Via Index Modulation [PDF]
IEEE Journal on Selected Topics in Signal Processing, 2021 Dual function radar communications (DFRC) systems are attractive technologies for autonomous vehicles, which utilize electromagnetic waves to constantly sense the environment while simultaneously communicating with neighbouring devices.
Dingyou Ma +4 more
semanticscholar +1 more source
Filter Shape Index Modulation [PDF]
ICC 2021 - IEEE International Conference on Communications, 2021 Index Modulation (IM) techniques enable a significant Spectral Energy (SE) and/or Energy Efficiency (EE) enhancement. In this paper, a novel Filter IM domain is being explored, where a novel scheme Filter Shape Index Modulation (FSIM) is proposed. In contrast to most existing Single-Input Single-Output (SISO) IM systems, the proposed scheme achieves a ...
Saad, Majed +4 more
openaire +3 more sources