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It is envisioned that future 5G wireless links will extensively employ multiple mm-Wave spectra (e.g., 28GHz, 37GHz, 39GHz, and 70GHz). A major bottom neck for silicon-based mm-Wave electronics lies in the generation of mm-Wave signals with high energy efficiency, high linearity, and large modulation bandwidth, all of which are indispensable to support Gbit/s complex modulations with large peak-to-average-power...
Antimonene is a new 2D material and its applications in gas sensors are still deficient. We took a first principles investigation of three small organic molecules (formaldehyde, acetone, and methane) adsorption on the antimonene. We found that only the adsorption of the acetone molecule could induce a moderate adsorption energy, obvious charge transfer, and large work function change, which are suitable...
The non-interferometric phase retrieval technique based on the transport-of-intensity equation (TIE) is employed to calculate the missing phase information from the intensity measurement. However, since the limiting effect of the lens aperture is existed in the actual imaging system, a certain effect on the resolution of the recovery phase is under consideration. A phase retrieval technology based...
Owing to the limitation of the fine pitch and the fine area array assembly, fine pitch package or micro BGA are facing challenges such as miniaturization, high density and assembly problems along with the rapid development of the high-density electronic packaging and surface mount assembly. The major limitation of the fine pitch packages is around 0.3mm. Exceeding this limitation encounters reliability...
As the device miniaturization, the assembly is becoming more and more dense. The current fine pitch package or micro BGA and other forms of interconnection come to a certain limit, which hindering the development of packaging and assembly. high-density assembly and packaging is facing a lot of new challenges. Today, even the most of the fine pitch packages' pitch maintained at around 0.3mm, it is...
With the development of high density electronic packaging and surface mount assembly, fine pitch package or micro BGA are facing challenges such as miniaturization, high density and assembly problems due to the fine pitch and fine area array assembly limitation. Most fine pitch packages' pitch limited in around 0.3mm pitch. If pitches are smaller than this limitation, the manufacture of packages'...
This paper presents the design of dual-polarized ultra-wideband six-beam arrays for wireless communications (1.694–2.69 GHz). Based on the required specifications such as gain, the beam coverage, the cross-over point between beams, the side lobe level, and the grating lobe, three ultra-wideband dual-polarized six-beam arrays with varying antenna specifications have been designed, implemented, and...
This paper presents the design and implementation of dual band dual polarized multi-beam base station antennas. By utilizing the interleaved single band elements with asymmetrical non-uniform spacing arrangements, the proposed multi-beam antennas have the following dual band hybrid functions: normal L multiple beams at low band (0.698–0.96 GHz) and double 2L multiple beams at high band (1.71–2.36/1...
Optical activity has been demonstrated by twisting cascading multilayer anisotropic metamaterials with cross-polarization conversions, for which the x-(y-) polarized light is significantly transformed to a y-(x-) polarized one with enhanced transmittance in a unidirectional manner. Here, we design a twisted tri-layer anisotropic metamaterial with the twisted angle θ = 22.5° to present the unidirectional...
A resource allocation scheme consisting of joint assignment of routing, wavelength and time-slot is proposed to construct different channels in software-defined optical networks secured by quantum key distribution (QKD). Security level is considered by key-updating period.
Nonvolatile static random-access memory (NV-SRAM) is a crucial component type for normally-off computing systems. This work proposes a novel 10T2R resistive random-access memory (ReRAM)-based NV-SRAM controller that is aware of redundant bit writes and considers the conditions of redundant bit writes. When data stored in SRAM cells are the same as the data in ReRAM devices, backup can be skipped....
Frequency bands above 6GHz are receiving great attention for 5G mobile radio communications due to the potential availability of enormous channel bandwidths. Various multi-carrier and single-carrier waveforms are being considered as potential candidates for 5G radio interface. When evaluating the waveform performance at high carrier frequency and large bandwidths, the inclusion of realistic hardware...
Modern wireless communication raise the demand for higher spectral efficiency, faster-than-Nyquist (FTN) signaling is able to increase transmission rate without expanding signaling bandwidth. In this paper, we develop a graph-based iterative FTN detector in the presence of phase noise (PHN). Wiener process is employed to model the time evolution of nonstationary channel phase. The colored noise imposed...
In this paper, a code-aided maximum-likelihood and moment-based joint SNR estimator is proposed for M- ary amplitude phase shift keying (APSK) signals over AWGN channels. The proposed estimator significantly improves the performance at low SNRs by utilizing the syndrome in the LDPC codes to act as a reference measurement of estimation performance. Moreover, a methodology to measure the performance...
The registration possibility of the excited states for impurity complexes A+ + e (acceptor with an additional hole, which interacts with an electron, localized in the quantum dot ground state) because of their contribution to the dielectric permeability of the semiconductor quasi-zero structure under intraband optical transitions of electrons in an external magnetic field, has been theoretically analyzed...
We demonstrate touch sensor application of spray coated Zinc Oxide (ZnO) thin-films with submicron thickness (50–200 nm). The prepared ZnO films are characteristic with a wide optical transmittance window (80% ∼ 97%) and a sheet resistance over 1500 ohm/square. The touch sensor was formed using a ZnO thin-film as an electrode attached to an oscillator circuit. The prepared touch sensors produce a...
In this paper, a general structure of type-III FIR filters with derivative constraints is proposed. It consists of a linear combinations of basic sub-filters, called cardinal filters, with weighting coefficients equal to derivatives of the target frequency response at ω = 0. Closed-form expressions for these cardinal filters are derived and their filter coefficients are shown to have a simple recursive...
The viscoelastic behavior of the molding compound in fine pitch encapsulated electronic packages has a significant impact on component warpage and SMT assembly reliability. This is particularly true for the thin or ultra-thin (such as fan-out) packages used in mobile handsets and tablets, where process-induced warpage behavior is exacerbated by a larger molding volume and higher density of Cu trace...
To prevent data losses and service interruptions caused by natural disasters or human misconduct, we need to leverage periodic disaster backup among geographically distributed multiple datacenters. Previous works aimed at bandwidth allocation to achieve maximum network flow for every backup pair one by one or fair load distribution for backup datacenters respectively, without jointly optimizing the...
Localization techniques are crucial for wireless networks in the age of big data. Exploiting pairwise measurements between agents, the scheme of cooperative localization yield superior performance and has been discussed extensively. However, despite its great significance for network design, the efficiency of cooperation remains an open topic. By introducing a decomposition of the Fisher information...
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