Results 41 to 50 of about 714,452 (294)
Active plasmonic devices and optical metamaterials [PDF]
, 2009 We studied active near-infrared metamaterials based on phase transition of vanadium oxide thin films, asymmetrically coupled split-ring resonators for narrowing resonance line-widths , field effect modulation of plasmon propagation and 3D single layer ...
Atwater, Harry A. +8 more
core +1 more source
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 +1 more source
Generalized Frequency Division Multiplexing With Flexible Index Modulation
IEEE Access, 2017 After the vision and the overall objectives of future wireless networks for 2020 and beyond have been defined, standardization activities for fifth generation (5G) wireless networks have been started.
Ersin Ozturk +2 more
doaj +1 more source
A Novel Downlink IM-NOMA Scheme
IEEE Open Journal of the Communications Society, 2021 In the next generations of communication systems, resources' scarcity devolves to a more critical point as a consequence of the expected massive number of users to be served. Furthermore, the users' contradicting requirements on quality of service forces
Abdullateef Almohamad +3 more
doaj +1 more source
A Detailed Study of 2S 0114+650 with the RXTE [PDF]
, 2008 We present the results of a detailed study of the high mass X-ray binary 2S 0114+650 made with the pointed instruments onboard the Rossi X-ray Timing Explorer.
Aab +56 more
core +1 more source
Unified Power Allocation for Receive Spatial Modulation Based on Approximate Optimization
IEEE Access, 2018 In this paper, a novel unified power allocation (PA) framework is proposed for receive (pre-coding aided) spatial modulation (RSM). We find that the PA matrix design can be formulated as a non-convex quadratically constrained quadratic program (QCQP ...
Ping Yang +5 more
doaj +1 more source
Switching management in couplers with biharmonic longitudinal modulation of refractive index
, 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 ...
Ablowitz +24 more
core +1 more source
Photoelastically induced light modulation in gradient index lenses [PDF]
, 1993 A new photoelastic light modulator is demonstrated based on the modulation of the birefringence and of the index profile in graded index lenses. Using the birefringence modulation we obtained 35% modulation depth in a quarter-pitch lens and 65% using a ...
Albert +15 more
core +1 more source
Upper-Bound Performance of a Wide-Band Adaptive Modem
, 1999 Adaptive modulation is applied in conjunction with a decision-feedback equalizer (DFE) in order to mitigate the effects of the slowly varying wide-band multipath Rayleigh fading channel in a noise-limited environment.
Hanzo, L., Wong, C.H.
core +2 more sources
Coherent phonon induced optical modulation in semiconductors at terahertz frequencies [PDF]
, 2013 The coherent modulation of electronic and vibrational nonlinearities in atoms and molecular gases by intense few-cycle pulses has been used for high-harmonic generation in the soft X-ray and attosecond regime, as well as for Raman frequency combs that ...
Constantinescu Anca Monia +4 more
core +2 more sources