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Interference alignment (IA) is a promising interference management technique to improve the achievable degrees of freedom (DOF) and system throughput in a K-user interference network. However, most IA schemes only focus on minimizing the interference leakage power, leading to poor performance at low to moderate SNRs. In this paper, we put forward a novel algorithm, namely, sum-rate improved interference...
Troposphere scatter communication is a kind of over-the-horizon communication depending on the medium inhomogeneity of the troposphere. By the acoustic wave, the inhomogenous layers with different dielectric constants can be formed artificially, which causes the coherent addition of reflection signal and enhances the radiation energy of the scattering wave. According to the turbulent flow theory of...
In communication systems with interference, the performance of traditional adaptive beamforming to search the direction of angle (DOA) of incoming desired signal degrades because of mismatch between the true array response and the assumed array response of desired signal in a receiver antenna array. In this paper, we approach the method of maximum output Signal-to-Interference-plus-Noise Ratio (SINR)...
One of the prominent techniques used to mitigate the electromagnetic energy radiation (which causes interference in the signal transmission) is smart antenna. The smart antenna system remains the noticeable dynamic approach employed to develop the power output of the signal of interest in a specified direction and reduce the interfering signal power in unnecessary direction. Smart antenna system comprises...
The axial resolution of conventional confocal microscopy is usually larger than 600 nm. In super-resolution microscopy, although Stimulated emission depletion (STED) microscopy offers lateral resolution beyond the optical diffraction limit [1, 2], the axial resolution often remains the same, unless a special set of phase modulation is employed. With two opposing objectives in 4Pi microscopy, the interference...
Polarization cancellation is an effective method to improve the radar target detection performance under the main lobe interference environment. Interference suppression ratio is widely used to assessment polarization filter performance. However, the radar target detection performance is determined by the Signal Interference plus Noise Ratio (SINR). It is important to analyze the polarization filter's...
Recently, the studies about the vector optical field have attracted a lot of interest due to its novel properties and potential applications. Compared to a scalar optical field with the uniform distribution of states of polarization (SoP), the vector optical field with nonuniform SoP in the field cross-section has many unique properties. Here we explore theoretically a vector optical field with hybrid...
We propose a reflective linear polarization converter with broadband and high-efficiency using ladder-shaped resonator (LSR) structure metamaterial (MM) based on multi-reflection interference theory. Three resonances generated by LSRs contribute to the expansion of working frequency range while the interference theory is employed to explain the characteristic of high-efficiency polarization conversion...
In this talk, I will discuss two applications of nonlinear quantum photonics in silicon nanowires: correlated photon pair sources and a single-photon wavelength converter. Correlated photon pairs can be generated in a nonlinear silicon waveguide through the spontaneous four-wave mixing (SFWM) process shown in Fig. 1(a), where two photons from a bright pump laser are annihilated, and a two photons...
Due to the increase of the operating frequency and the complexity of modern microwave circuits, transient hybrid field-circuit simulations have aroused great interest in the field of heterogeneous electromagnetics such as signal integrity/power integrity (SI/PI), electromagnetic compatibility/electromagnetic interference (EMC/EMI), etc‥ A novel transient field-circuit cosimulation method based on...
This paper presents a new algorithm to estimate the ranges of multiple targets with super-resolution in Frequency Modulated Continuous Wave (FMCW) radar systems. The proposed algorithm is based on the monopulse estimation technique. The estimation of multiple ranges is equivalent to finding multiple frequencies from noisy discrete-time observations. In multiple frequency estimation, the frequencies...
In this paper, an approximate model is presented to understand Fano resonances observed in the Mie scattering from a core-shell particle with high permittivity cover. The scattering coefficients of a core-shell particle with high permittivity cover can be described by the superposition of narrow resonance and slow varying background. The slow varying background part is the same as scattering coefficient...
We experimentally generate a stochastic electromagnetic beam with controllable coherence, employing two crossed zero-twisted nematic liquid crystal spatial light modulators. The coherence of the stochastic electromagnetic beam can be controlled by the variation magnitude of phase modulation of the spatial light modulators. We measure the coherence properties of the beam using Young's interference...
The 2012 World Radiocommunication Conference (WRC-12) allocated the 694– 790MHz (700 MHz) band for the mobile service on a co-primary basis with other services including digital terrestrial television service in Region 1. Countries of Region 1 will also be able to continue the use of these frequencies for their digital terrestrial television services. This allocation of mobile service in Region 1...
Traditional optical interference narrow-band-stop filters do not possess wide-angle property, because peaks and troughs of filter spectrum move to short wavelength at non-normal angle of incidence (AOI), which could result in functional failure in particular cases, e.g., blocking of laser for pilot in cockpit during premeditated laser pointer direct. For this reason, we designed a wide-angle metamaterial...
We will report on our latest experimental result on atom-light hybrid interferometer. We demonstrated a new type of hybrid atom-light interferometer [1] with two atomic Raman amplification processes (RA1 and RA2) replacing the beam splitting elements in a traditional interferometer. Different with conventional optical interferometer, the first beam splitter process in atom-light hybrid interferometer...
With its simple fabrication, low economic cost, good interference effect, large interference range, etc., the corner reflector is now being widely used in anti-missile, anti-detection and other fields. This paper presents a broadband millimeter-wave radar system to cope with the interference. This system uses the technology of DBS imaging and image processing to combat the dilute interference as well...
In nature, a variety of insects, plants, or other living species utilizes micro-scale fibers/hairs to possess hydrophobic surface on their bodies. Hydrophobic surface is important especially for small living species to keep their fragile bodies against surface tension of water droplets and to keep their body surface clean. By being inspired by such natural microstructures, we artificially fabricated...
First, the paper analyzes the basic principle of the uplink MU-MIMO and gives the user matching conditions and application suggestion. Then, an estimation method of uplink MU-MIMO gain is presented based on the tests analysis. At last, the performance of uplink MU-MIMO in the current user condition is also given.
For applications in photonics, optical data storage devices and bio-sensing, Surface Plasmon Polaritons (SPPs) have been intensely studied because of its high spatial confinement and precise optical control with, for example, its quantum properties. SPPs can be photo-generated on a metal surface as a propagating electromagnetic wave and guided in any arbitrary shape, while the vertical confinement...
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