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In this paper we derive the distribution of the total contention delay in wireless sensor networks (WSNs) tasked with detection of an intruder in a specific sensing field. We use a stochastic geometry framework to model the WSN, in which the sensor nodes send their local decisions and data to the fusion center over a shared communication channel employing a contention based MAC protocol. We first...
Combined with the Moon exploration, it builds the simulation scenario about the communication between Deep Station and Moon Detector. It analyzes the problems in the deep communication, such as: the big path loss, large delay and intermittent communication. Based on the analysis, it provides the methods to solve the problems and analyzes the effect for using the appropriate measures which can enhance...
We present an attack to locate hidden servers in anonymous common networks. The attack is based on correlating the flow of messages that arrives to a certain server with the flow that is created by the attacker client. The fingerprint is constructed by sending requests, each request determines one interval. To improve the performance a prediction of the time of arrival is done for each request. We...
In the future, the nuclear threat is less likely from a massive nuclear attack, but more likely from crude devices, such as dirty bombs perpetrated by an individual or group of terrorists. Detection and prevention of these nuclear devices are critical to the safety and security of the general population. In general, the research of detecting various radioactive sources using individual sensors has...
This paper presents a construction of dual-edge-triggered flip-flops (DET-FFs) with timing error detection capability. The proposed FF is based on a conventional DET-FF and a conventional timing error detection method. While the conventional timing error detection uses a transition detector with the area of large, the proposed FF uses internal signals in a DET-FF as an alternative of the transition...
An auto selective boost (ASB) scheme for slow SRAM memory cells in random variations has been proposed. ASB shortens the cycle time and decreases the average BL amplitude, which reduces both dynamic and leakage energy dissipation. The cycle time of SRAM is reduced by 60% at 0.5V using the proposed ASB scheme. By combining the ASB with a BL amplitude limiter (BAL), the energy dissipation is reduced...
As the number of core integration on a single diegrows, buffers consume significant energy, and occupy chip area. A bufferless deflection routing that eliminates router's inputportbuffers can considerably help saving energy and chip areawhile providing similar performance of existing buffered routing, especially for low-to-medium network loads. However when congestion increases, the bufferless frequently...
A fast locking 3.0 Gb/s clock data recovery circuit (CDR) based on the digital DLL is proposed for intra-panel clock-embedded display interface. The CDR uses 3-level sub-ranging delay control in digital DLL. Overlapping range selection, successive approximation, and highly-linear timing amplifier are used for most, intermediate, and least significant bits of control, respectively to improve both jitter...
The paper presents the concept, design and analysis for a visible light communications receiver which has a full 180° perception angle thus offering the guard against blocking and enhancing the system mobility. The proposed receiver includes seven sub-receivers with the proposed geometrical shape investigated and analyzed in MATLAB® for evaluating the received power, RMS delay spread and corresponding...
Cognitive Radio is an enabling technology that is expected to address the problem of scarcity of spectrum by intelligent access, mobility and management of spectrum and pave way for efficient usage of the same. Increasingly, it is seen that most research is directed towards building theoretic models for spectrum access and management. Though some of these are backed by simulations, certainty of any...
This paper presents the concept, design and analysis for a visible light communications receiver to guard against blocking and enhance mobility. Different geometrical shapes have been investigated, with two being chosen and analyzed in MATLAB for the received power and the root-mean-square (RMS) delay spread. The results show that the receiver is fully mobile within the test area and can handle data...
A mm-wave delay locked loop (DLL) using a full rate sub-psec phase detector (PD) is presented. The PD employs a differential lumped hybrid coupler to create and combine quadrature phase components of the input signals and performs amplitude measurement in order to measure phase difference between the input signals. The DLL and PD were implemented using the TSMC 40nm LP CMOS process and measured using...
This paper presents a low-power MMSE MIMO detector using a dynamic voltage wordlength scaling (DVWS) technique for 4×4 MIMO-OFDM systems. A MIMO MMSE detector requests high performance computing for real-time processing. A pipelined MMSE detector using Strassen's algorithm has been developed in our previous work. However, it consumes significant power and thus, we have to consider a low-power solution...
Multi-phase clock generation (MPCG) is a problem that aims to generate a sequence of clock signals with the same frequency and uniformly shifted phases. In this paper we propose a MPCG design with two major innovations: (1) We use a process calibration scheme that makes the per-phase delay (defined as the timing difference between two consecutive clock signals) highly accurate. (2) We further exploit...
Energy detection is widely used by cognitive radios for spectrum sensing. During a silent period, secondary users (SUs) are kept silent so that the energy detector does not confuse SU signals for primary user (PU) signals. Due to imperfect coordination, an SU may transmit during a silent period and cause possible false alarms. We propose to leverage matched filters that already exist in many SUs to...
A well used approach for echo cancellation is the two-path method, where two adaptive filters in parallel are utilized. Typically, one filter is continuously updated, and when this filter is considered better adjusted to the echo-path than the other filter, the coefficients of the better adjusted filter is transferred to the other filter. When this transfer should occur is controlled by the transfer...
In this paper, the performances of different kinds of IEEE802.15.4a receivers, which are suitable for the modulation methods and their combinations defined by the standard, are compared using two dissimilar channel models for wireless body area networks. The reference channel model is the one defined by the IEEE802.15.6 standardization group, and the other one is based on the channel measurements...
The process variation among 512 DRAM samples is more than 30% [1]. The performance variation of general circuits is predicted to be over 60% in 2012 [2]. In general, a single-die-based DRAM has a large process variation from chip to chip, which among other parameters, causes tAC (address access time) variation in the application system. In order to reduce the tAC variation, most highspeed SDRAMs adopt...
In this paper, we propose, evaluate and compare two detectors of apnea-bradycardia episodes, based on hidden Markov models (HMM) and hidden semi-Markov models (HSMM). Evaluation is performed on a database of 233 apnea-bradycardia episodes manually annotated. The acquired ECG signals are processed to obtain RR series. The proposed detectors, applied to these RR series, are composed of two HMM or HSMM...
Epilepsy affects 50 million people worldwide, and 30% remain drug-resistant. This has increased interest in responsive neurostimulation, which is assumed to be most effective when administered right at the seizure onset. We propose a novel framework for seizure onset detection that involves (i) constructing statistics from intracranial multichannel EEG signals (iEEG) to distinguish non-ictal vs. ictal...
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