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Nowadays, transmission of data via Internet has made illegal data distribution a major problem in digital world. Watermarking is known as a possible solution to protect digital data. In this work, we propose a blind detector for multiplicative watermarking of images in the wavelet domain. To this end, the vector-based hidden Markov model (HMM) is employed as a prior model for the wavelet coefficients...
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,...
A hybrid voltage-mode hysteretic boost converter is introduced in this work. The implemented control topology is practically self-stabilized due to the introduction of a current-limiting loop. A full range inductor current sensor and a hysteretic comparator are used to realize the current-limiting loop. A zero current detector is also implemented to enable a seamless transition from continuous to...
Viterbi detectors are widely used in data recording channels in the timing loop as well as in the digital back end before error-correction decoding to detect data in the presence of inter-symbol interference (ISI) and noise. Further, soft reliability values assist in the decoding of outer codes. The state-of-the-art implementations of the Viterbi algorithm are synchronous which consider the ‘worst-case’...
Sparse Code Multiple Access (SCMA) is a promising multiple access technology candidate for 5G wireless communication systems. The high detection complexity is its bottleneck. Stochastic computation is an ultra-low complexity digital signal processing technique in which probabilities are represented and processed with streams of random bits. In this paper, we propose a novel low complexity stochastic...
This paper describes a novel readout integrated circuit (ROIC) for a nanoscale photoresistive image sensor array with a novel dual element readout and calibration method. The dual element readout increases detector signal sensitivity and sensor dynamic range. It works on the assumption that adjacent nanoscale detectors have similar illumination levels. A novel on-chip two-point calibration method...
We present an x-ray quanta image sensor (XQIS) utilizing temporal oversampling and CMOS image sensor technology. The output of the XQIS is a binary bit frame with each bit representing the presence or absence of a detected x-ray photon. The bit frames are read out at very high rate (>1000fps) and a series or bit values are combined to form pixel values using digital frame integration. A system...
As one of the most promising future fundamental devices, memristor has its unique advantage on implementing low-power high-speed matrix multiplication. Taking advantage of the high performance on basic matrix operation and flexibilitys of memristor crossbars, in this paper, we investigate both discrete Fourier transformation (DFT) and miltiple-input and multi-output (MIMO) detection unit in baseband...
The current work proposes a method and circuitry for a lightning strike detection system with current and vibration detecting features. A Rogowski coil is used for current detection, which can be placed around a conductor where the lightning current is expected to flow. The method also provides means of ascertaining which tower is closest during the moment of the strike through use of a dual-axis...
To increase power conversion efficiency (PCE), we introduce a new rectifier, which combines advantages of cross-coupled and cross-coupled bridge rectifiers by switching between the two topologies according to the incoming signal power level. In conventional designs, cross-coupled topology attains up to 80% PCE in the low-power range, while cross-coupled bridge topology attains up to 80% in the mid-power...
In this paper, we explain the THz detection mechanism in sub-threshold Si MOSFETs by exploiting the exponential dependence of channel electron density to the gate-source voltage. According to our theory, this high frequency non-linear dependence is the underlying mechanism for rectification of THz radiation. The maximum detection frequency is limited by dielectric relaxation time of the electrons...
The paper presents a CMOS clock and data recovery (CDR) circuit for a full-rate 40 Gb/s optical receiver, and the proposed CDR adopts a mixer-based phase detector (MBPD). The MBPD approach offers several advantages such as capability to operate high frequencies, and a linear relationship between the phase difference and the output current. However, an MBPD requires a frequency-doubling mechanism (FDM)...
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 a mobile vehicle classification technique achieved by tracking two vehicle based Points of Interest (PoI) in multiple filter configurations to compose a vehicle specific 3D geometry. Using high fidelity physics based simulation we demonstrate the capability to classify the 3D geometries in the presence of noise by extracting vector magnitudes and angles as features. Additionally, we investigate...
This paper presents the current state of a novel event-based surveillance framework for real-time detection and tracking of the person-of-interest with IP PTZ network camera. Formulating the problem in a (non-linear) Bayesian filtering framework in combination with Convolutional Neural Networks (CNN), we develop dynamical and adaptive approaches for identifying the Person-of-Interest(PoI) from its...
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