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A 0.6-V, 200-kbps, 429-MHz ultra-low-power FSK transceiver (TRX) is presented. The receiver (RX) adopts a frequency-to-time based demodulator, which detects high or low frequency to determine data output level. The proposed RX achieves −85-dBm sensitivity at 0.1% BER and draws 0.146 mW. A 38.7% global efficiency, 429-MHz FSK transmitter (TX) is also reported in this paper. To remove the power-hungry...
A wideband tunable low-noise microwave generation system utilizing optoelectronic oscillator based on the deamplification of stimulated brillouin scattering is demonstrated. Tunable 12–20GHz microwave signals with phase noise of −120dBc/Hz at 10kHz offset are achieved.
A novel high-efficiency 36–50GHz millimeter-wave down-conversion system utilizing an optoelectronic oscillator based on stimulated brillouin scattering is demonstrated. 35–49GHz signals are down-converted to 1GHz IF with −35.72dB conversion-efficiency and without optical or electronic amplifiers.
We demonstrate a narrow-linewidth, low-threshold surface-plasmon-polariton (SPP) laser based on a low-loss open cavity resonator leveraging grating-coupled SPPs to pump the lasing SPPs with strong spatial overlap and minimum perturbation.
We develop a cost-effective and highly reproducible method for manufacturing large-area dielectric metasurfaces. A high-performance silicon metasurface for generating cylindrical polarized vector beam is demonstrated as an example.
We demonstrate centimeter-size, color-stable flexible OLEDs using an ultra-thin Ag electrode. The device shows ∼35% enhanced current efficiencies compared to its ITO counterpart, stable emission color even at large observation angles, and bending stability over 1000 circles.
We demonstrate a new measurement procedure using attenuated total internal reflection ellipsometry for accurately extracting the permittivity of hyperbolic metamaterials. This technique enhances the interaction of probe light with the HMM, thus providing sufficient ellipsometric parameters for the subsequent permittivity extraction.
In this paper, we propose a fast design procedure for the low scattering metasurface in the microwave region. Since there are numerous units with various geometric dimensions inside the metasurface aiming to generate a diffusion-like scattering pattern, it presents a large computation burden for the evaluation and optimization of the scattering behaviors of the whole metasurface. To overcome this...
A key feature of Software Defined Network is the decoupling of control pane and data plane. Although delivering huge benefits, such a decoupling also brings a new risk: the data plane states (i.e., flow tables) may deviate from the control plane policies. Existing data plane testing tools like Monocle check the correctness of flow tables by injecting probes. However, they are limited in four aspects:...
By suppressing the additive phase noise induced by light scattering in the optical fiber and optical interference due to the optical reflection in a microwave phase noise measurement system using photonic-delay based frequency discriminator, the sensitivity improvement of 10 dB is experimentally achieved. Using the proposed measurement scheme, a single sideband phase noise is measured to be −145 dBc/Hz...
A 10 GS/s photonic sub-sampling ADC is proposed and experimentally demonstrated. The single-sideband phase noise of the optoelectronic oscillator is tested to be −128 dBc/Hz at 10 kHz offset and the aperture jitter of the photonic ADC is 40.3 fs with the integral interval from 1 kHz to 10 MHz. 23 GHz and 43.1 GHz signals are sampled by the system with the ENOB of 5.0 bits and 4.2 bits.
While extending network programmability to a larger degree, P4 also raises the risks of incurring runtime bugs after the deployment of P4 programs. These runtime bugs, if not handled promptly and properly, can ruin the functionality and performance of networks. Unfortunately, the absence of runtime debuggers makes troubleshooting of P4 program bugs challenging and intricate for operators. This paper...
Speech feature learning is very important for the design of classification algorithm of Parkinson's disease (PD). Existing speech feature learning method for classification of PD just pays attention to the speech feature. This paper proposed a novel hybrid feature learning algorithm which puts the features of all the speech segments of each subject together, thereby obtaining new and high efficient...
The Radio Interferometric Positioning System (RIPS) is a phase-based localization scheme that achieves high accuracy with low-cost devices. Indoor localization with RIPS is, however, a challenge due to dense multipath. In this paper, we propose holographic radio interferometry (HRI) to cope with multipath effect. HRI builds hologram out of phase measurements in radio interferometry for the mobile...
A novel broadband circularly-polarized (CP) antenna fed by strip-line is proposed. The CP operation is achieved by corners truncated and can be significantly improved by introducing a pair of half loop strips around two opposite corners of the square patch. The bandwidths for the axial ratio (AR < 3 dB) and relative impedance (|S11| < −10 dB) is 7.6% (16–17.2 GHz). The proposed antenna also...
Metamaterial absorber (MMA) has been widely used in many fields like stealth and electromagnetic shielding. However the optically opaque property of the MMA hinders them from electronic applications in some scenarios demanding large light transmittance and high microwave absorptivity simultaneously. Here we present a novel metamaterial for simultaneously optical transparency and millimeter wave absorption...
Multimodal medical volumetric image fusion (MVIF) plays an important role in medical image processing. This paper presents a novel MVIF method based on multifeature obtained by a multiscale geometric analysis of the threedimensional shearlet transform (3DST) with contextual hidden Markov model (CHMM) and type-2 fuzzy logic techniques. First, the preregistered medical volumetric images are decomposed...
Interface charges are easy to accumulate between two different dielectrics with various characteristics, which may cause accelerated degradation of insulation systems. Ethylene-propylene-diene terpolymer (EPDM) is used mainly for HVDC cable joint, which is the most vulnerable part of the cable system because of the interface. Particles with nonlinear conductivity can be doped into the polymer matrix...
We present the study of generation mechanism of terahertz (THz) radiation from tightly focused femtosecond laser pulses in a gas medium. The analysis of the experimental data led to the assumption that the dipole radiation prevails in most cases despite the existing conception regarding the dominating role of the quadrupole mechanism of radiation.
A novel approach based on nondominated sorting genetic algorithm II (NSGA-II) is proposed to suppress sidelobe level (SLL) and sideband level (SBL) in time-modulated linear antenna arrays. The SLL and SBL of a time-modulated linear array can be reduced by optimizing the excitation amplitudes as well as the switch-on time intervals of each element. A 32-element linear array has been synthesized to...
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