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A non-orthogonal multicarrier signal, termed spectrally efficient frequency division multiplexing (SEFDM), is investigated in this work. It improves spectral efficiency by compressing sub-carrier spacing below the symbol rate at the cost of self-created inter carrier interference (ICI). Sphere decoding (SD) is an efficient method to recover signals approaching maximum likelihood (ML) performance....
In this paper, we propose two simple and practically feasible countermeasures to address the Route Spoofing and Resource Exhaustion attacks in Software Defined Networking (SDN) scenarios. For Route Spoofing attack, we introduce a new technique called “selective blocking” which blocks an adversary node to use a genuine user's active routes, and for Resource Exhaustion attack, we propose a “periodic...
In this paper, we attempt to manage GC overhead at the operating system level. In our approach, first, we use a machine learning technique to devise a GC detecting mechanism at the operating system level, and second, we show that by making use of this mechanism performance variance normally observed on SSDs can be reduced. We develop a GC-detector that detects garbage collection of SSDs and request...
This paper presents a zero-bias Schottky diode detector optimized for 24 GHz six-port radar applications. Based on a typical radar system, different requirements for the diode detector are derived. Moreover, a detector layout is chosen, a full mathematical model is presented and compared with Keysight ADS simulations. An optimization process is described to design a detector circuit which meets all...
The signals of magnetic encoders (MEs) are a pair sinusoidal waves: a sine wave and a cosine wave. Due to many different causes, they contain error factors such as offsets, amplitude differences, phase shifts, and random noise. This paper proposes auto-calibration and noise-reduction methods to reduce these errors and to estimate the positions of MEs. This method includes auto-calibration and adaptive-bandwidth...
This paper presents the design, optimization, and characterization of a square-law power detector for heterodyne millimeter-wave radiometers implemented using 0.13 μm SiGe HBTs. A 3-dB bandwidth of 19–34 GHz (56% fractional bandwidth) is obtained through the use of inductively degenerated SiGe HBTs with large emitter lengths. The detector achieves a minimum noise-equivalent power (NEP) of 0.49 pW/VHz...
The designing of instruments aimed to measure electromagnetic interference (EMI) is particularly challenging. The most critical aspect is the high dynamic range, which is required to avoid overload conditions and thus to guarantee reliable measurements. Unfortunately, also adhering to today's standards (i.e., CISPR 16-1-1) is not sufficient to avert overload phenomena. With three simple experiments,...
Measuring broadband signals demands complex calibration of a detector over a sufficient bandwidth. For inertial cavitation emissions, the shock waves will be convolved with the transfer function of the hydrophone, and introduce artefacts to the measurement. Use of appropriately calibrated detectors would thus facilitate meaningful comparison of the cavitation emission data reported from groups using...
This paper presents a piezoelectric energy harvesting interface circuit with a technique to broaden the bandwidth by introducing two time delays into the conventional synchronous-electrical-charge-extraction (SECE) scheme. The circuit adaptively adjusts these time delays for maximum power output at off-resonant frequencies. The bandwidth is increased by 71% while the power consumption of the circuit...
This article investigates photoconductive THz detectors based on low-temperature-grown InGaAs/InAlAs with a localized Be doping profile. With this approach we address the inherent trade-off between ultrafast carrier trapping and high mobility in photoconductors. The processed detector antennas show an excellent performance and feature a detection bandwidth of more than 6 THz and a signal-to-noise...
We present a THz heterodyne detector based on a single layer graphene field effect transistor (GFET) integrated with a bowtie antenna at 400 GHz. The heterodyne detection is achieved by coupling RF and LO signals quasi-optically to the same GFET. The down converted IF signal is extracted via a coplanar stripline connected to the GFET source and drain terminals. The measured IF bandwidth is 5 GHz.
Long bases RT THz standoff spectrometer is designed. GaSe91S0.09:Al(0.03 at.%) DFG of near IR lasers was seeded by THz emission from electronic system. THz generation efficiency was improved by the factor of ≥10 at principally reduced emission bandwidth, and pulse magnitude variation decreased for at least of 4–5 times.
A D-Band total power radiometer, implemented in an advanced 90 nm SiGe BiCMOS technology is presented. The passive imager front-end consists of D-Band LNA followed by a HBT-based power detector. The LNA achieves 30 dB gain over 28 GHz bandwidth with measured noise figure lower than 7.5 dB. The square-law power detector achieves responsivity of 14.5 kV/W and noise equivalent power (NEP) <1.5 pW/√Hz...
This work reports a frequency-agile receiver front-end for rapidly changing channels. The receiver includes a programmable low noise amplifier (LNA) that can be tuned from 4.3 to 5.7 GHz using an all-digital phase-locked loop (ADPLL). It also includes a power detector, a 10-bit SAR ADC, and a closed-loop system to dynamically optimize the matching of the LNA.
We present performance characterization of a bio-potential recording system with an asynchronous readout architecture. The signal processing chain consists of a low-noise bio-potential amplifier, spike detection circuitry, and an address event representation (AER) communication protocol. The system was fabricated in a 0.5 pm CMOS technology. Each stage of the recording system was tested individually,...
The performance of data-intensive parallel jobs is often constrained by the cluster's hard-to-scale network bisection bandwidth. Previous solutions do not consider inter-job data dependencies and schedule jobs independently from one another. In this work, we find that aggregating and co-locating the data and tasks of dependent jobs offers an extra opportunity of data locality that can help to greatly...
We propose a scheme of multi-channel quantum random generator based on superluminescent LED (SLED), which can use only one laser source to generate independent random bit sequences parallelly. By using dense wavelength division multiplexing (DWDM) module with 100 GHz interval, we produced 10 random bit streams in different channels, every stream's generating speed reaching 2.5 Gbps. All the random...
In non-destructive testing (NDT) and industrial process monitoring [1], reflection geometry is commonly preferred over transmission, because only one-side access to the sample is possible. State-of-the-art terahertz (THz) time domain spectroscopy (TDS) systems hitherto use different emitter and detector devices [2], such that either an angled THz beam path or a beam splitter is required to enable...
A plasmonic photodetector based on nanomonopoles is proposed and investigated. The detection region is a thin film of InGaAs, placed on a n-doped InP substrate. The responsivity of the photodetector is estimated to be ∼200 mA/W, while its 3 dB electrical bandwidth is ∼ 1 THz.
Indoor positioning for visible light communication (VLC) has gained significant attentions recently with the popularity of light-emitting diodes (LEDs). In this paper, we consider a typical application of VLC by proposing a three-dimensional positioning scheme for a target terminal equipped with multiple photodiodes (PDs). Given the relative coordinates between the target terminal and receiving PDs...
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