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A low-complexity rate-compatible LDPC decoder

A low-complexity rate-compatible LDPC decoder

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43rd Asilomar Conference on Signals, Systems and computers

作者： Zhang, Kai Huang, Xinming Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA 01609 United States

ISBN: (纸本)9781424458271

In this paper, we present a rate-compatible LDPC decoder architecture which supports code rates between the rate of the mother code and 1. The rate-1/2 2304-bit Quasi-Cyclic (QC) LDPC codes with dual-diagonal parity check structure is selected from WiMax standard as the mother code and is punctured using specific puncturing patterns to obtain arbitrary rates. Parallel layered decoding architecture (PLDA) is employed to reduce chip area and improve the throughput. Simulation results show that the proposed punctured codes have comparable error correcting performances with the performances of dedicated codes from WiMax standard. The decoder is implemented on the platform of Xilinx XC2V8000. Compared with previous WiMax LDPC decoders synthesized by the same device, our lowcomplexity decoder consumes less FPGA resources: reduction of slices by 63%, flip-flops by 73%, look-up tables (LUTs) by 60% and RAMs by 30%.© 2009 IEEE.

关键词： Flip flop circuits

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Real-time lane departure and front collision warning system on an FPGA

Real-time lane departure and front collision warning system ...

引用

2014 IEEE High Performance Extreme Computing Conference, HPEC 2014

作者： Zhao, Jin Xie, Bingqian Huang, Xinming Department of Electrical and Computer Engineering Worcester Polytechnic Institute WorcesterMA01609 United States

ISBN: (纸本)9781479962334

Driving safety is a top priority when designing intelligent automobiles. In this paper, we present an FPGA-based real-time system for lane departure warning (LDW) and front collision warning (FCW), which requires intensive computation and memory access for high resolution video input from a front-view camera. Our system first converts gray scale video input into desired binary video images by applying Sobel filter, Otsu's threshold binarization and dilation. Hough transform is then applied to detect lanes for LDW. The front vehicles are detected for FCW by searching shadow area on the images. Our experimental results demonstrate the FPGA design is fully functional and it can process about 160 frames per second for 720P video input, which exceeds the real-time processing requirement. © 2014 IEEE.

关键词： Field programmable gate arrays (FPGA)

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Real-time Prediction Algorithms to Detect Clouds and Forecast Photovoltaic System Performance 49

Real-time Prediction Algorithms to Detect Clouds and Forecas...

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49th IEEE Photovoltaics Specialists Conference, PVSC 2022

作者： Mughal, Maqsood Ali Adua, Habeebullah Uddin, Muhammad Hammad Sauter, Evan Natale, Stephen Lewis, Timothy Ferreira, Jonathan G. Worcester Polytechnic Institute Electrical & Computer Engineering Department Massachusetts Worcester01609 United States

ISBN: (数字)9781728161174

ISBN: (纸本)9781728161174

When clouds roll over photovoltaics (PV) arrays, PV systems' output power fluctuates. As a result, the PV penetration into the power grid causes energy imbalance and technical problems such as voltage instability in distribution networks. We designed an intelligent Cloud Motion Vector Sensor (CMVS) system model that utilizes gradient matrix and peak detection algorithms to compute cloud motion parameters such as cloud speed and direction. A predictive PV System model is also designed in Simulink that uses a perturb and observes maximum power point tracking (MPPT) algorithm to predict the performance of the PV system. Power management companies may benefit from the two models to better manage grid integration of renewables and non-renewables in the energy mix. © 2022 IEEE.

关键词： Forecasting

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A fast real-time memory authentication protocol

A fast real-time memory authentication protocol

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3rd ACM Workshop on Scalable Trusted Computing, STC'08, Co-located with the 15th ACM computer and Communications Security Conference, CCS'08

作者： Hu, Yin Hammouri, Ghaith Sunar, Berk Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA 01609 United States

ISBN: (纸本)9781605582955

We propose a new real-time authentication scheme for memory. As in previous proposals the scheme uses a Merkle tree to guarantee dynamic protection of memory. We use the universal hash function family NH for speed and couple it with an AES encryption in order to achieve a high level ofsecurity. The proposed scheme is much faster compared to similar schemes achieved by cryptographic hash functions such as SHA-1 due to the finer grain incremental hashing ability provided by NH. This advantage in speed becomes more vivid when the frequency of integrity checks becomes much lower than the frequency of memory updating. This feature is mainly due to the incremental nature of NH. Moreover, we show that with a small variation in the universal hash function family used, we can achieve fast and simple software implementation. Copyright 2008 ACM.

关键词： Authentication

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Memristor memory trade-offs and design considerations 14

Memristor memory trade-offs and design considerations

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2014 14th IEEE International Conference on Nanotechnology, IEEE-NANO 2014

作者： Smaili, Sami Massoud, Yehia Electrical and Computer Engineering Department Worcester Polytechnic Institute WorcesterMA01609 United States

ISBN: (纸本)9781479956227

The continuous demand for high storage capacities in modern electronic systems has made it more than ever important to find memory technologies beyond CMOS that are able to cope with the challenges at the nanoscale while catering to the requirements of high performance and robust operation. Memristors are excellent candidates for post CMOS memories, owing to their nanoscale nature and their programmability and ability to retain their state when turned off. In this paper we present design considerations for memristor memories for robust operation and discuss the trade-off between reading operations, refresh rates, and writing, stemming from the inherent variability of the memristor state when read. © 2014 IEEE.

关键词： Memristors

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Energy efficient relaying games in cooperative wireless transmission systems

Energy efficient relaying games in cooperative wireless tran...

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41st Asilomar Conference on Signals, Systems and computers, ACSSC

作者： Yang, Jie Brown III, D. Richard Electrical and Computer Engineering Department Worcester Polytechnic Institute Worcester MA 01609 United States

ISBN: (纸本)9781424421107

In wireless networks, intermediate nodes are often used as relays to reduce the transmission energy required to deliver a message to an intended destination. The selfishness of autonomous nodes, however, raises concerns about their willingness to expend energy to relay information for others. This paper considers the effect of selfishness on energy efficiency using a non-cooperative game theoretic approach. A two-source relaying game is formulated for both non-fading and fading scenarios. We show that cooperative transmission with optimum energy allocation is a Nash Equilibrium in non-fading channels when the sources are sufficiently patient. In fading channels, cooperative transmission with optimum energy allocation is also a Nash Equilibrium when a ceiling is applied to the relay energy of each source. Simulation results show that sources acting in their own self-interest can achieve an energy efficiency close to that of centrally optimized energy allocation in many cases. © 2007 IEEE.

关键词： Energy efficiency

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Opportunistic broadcast of emergency messages in vehicular ad hoc networks with unreliable links 5

Opportunistic broadcast of emergency messages in vehicular a...

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5th International ICST Conference on Heterogeneous Networking for Quality, Reliability, Security and Robustness, QShine 2008

作者： Li, Ming Lou, Wenjing Department of Electrical and Computer Engineering Worcester Polytechnic Institute WorcesterMA01609 United States

ISBN: (纸本)9789639799264

Multi-hop broadcast is an important means to disseminate safety information like time-sensitive emergency messages (EMs) in Vehicular Ad hoc Networks (VANETs). Providing low-latency, highcoverage and scalable multi-hop EM broadcast is a hard task in VANET with unreliable links. The major challenge comes from that fact that the link-layer broadcast uses unreliable transmissions, i.e., no positive feedback to acknowledge the reception of the message. Many existing works have used redundant relay nodes to enhance the reliability of broadcast packet reception. However they often involve more relays than it is necessary, which increases the network load and undermines the scalability of the protocol. Moreover, large latency is often incurred due to coarse protocol design. In this paper, we propose a new EM broadcast scheme that uses a small number of relays to achieve fast multi-hop EM propagation, at the same time to maintain a high level of transmission reliability, i.e., a minimum packet reception probability (PRP). Two types of relays are introduced to provide fast EM propagation and to enhance PRP simultaneously, so that low-latency, the desired reliability level and small overhead can be achieved at the same time. The opportunistic broadcast protocol (OBP) is based on opportunistic broadcast (OB), a MAC-layer mechanism to select single relay distributively, which features an effective redundant relay suppressing mechanism and very small rebroadcast delay for high priority nodes. Simulation study shows that OBP achieves close to 100% PRP, while using a small number of relays with very low broadcast latency under a wide range of road traffic conditions. © Copyright 2008 ICST.

关键词： Scalability

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DeePaGait: Motor Assessment of Parkinson's Disease Using a Multi-Layer 1D Convolutional Neural Network on Smartphone Gait Data

DeePaGait: Motor Assessment of Parkinson's Disease Using a M...

引用

2022 IEEE International Conference on Big Data, Big Data 2022

作者： Abujrida, Hamza Agu, Emmanuel Pahlavan, Kaveh Worcester Polytechnic Institute Department of Electrical and Computer Engineering WorcesterMA01609 United States

ISBN: (纸本)9781665480451

Nearly 1 million people in the USA and 10 million people worldwide are living with Parkinson's disease (PD) [1]. The progression of the disease can be inferred from the changes in the patients' gait to inform early intervention. Due to their near-ubiquitous ownership, smartphone sensing is a very effective, highly available way of assessing gait. Objectives: In this work, we explore the inference of PD gait, by analyzing the patient's walk data collected from a smartphone in the patients' homes, using Deep Learning (DL) methods. Specifically, we investigate DL models to classify the severity of the motor part of the UPDRS (MDS-UPDRS 2.10-2.13). Methodology: Using data from the mPower study [2], we selected 152 PD patients who recorded at least 3 walks before taking their medication. We extracted gait cycles from the accelerometer and gyroscope sensor records and fed them to DeePaGait;our DL multi-layer Conventional Neural Network (CNN). DeePaGait operates on 1Dimensional convolution filters to classify 30 seconds of walking data into one of five severity levels (Normal, Slight, Mild, Moderate, Severe). Results: Our DeePaGait DL network was able to Classify the PD Walking-Balance, Shaking/Tremor, and Freeze of Gait (FoG) symptoms, with an accuracy of: 99.1%,98.4%, and 98.2% respectively. Conclusion: Despite the challenges of working with a patient-labeled, crowdsourced dataset, we were able to demonstrate that gait classification based on smartphone sensor data is a viable approach to infer the severity of PD gait anomalies. © 2022 IEEE.

关键词： Smartphones

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Globally convergent state estimation via the trust region method

Globally convergent state estimation via the trust region me...

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2003 IEEE Bologna PowerTech Conference

作者： Pajic, Slobodan Clements, Kevin A. Department of Electrical and Computer Engineering Worcester Polytechnic Institute Worcester MA 01609 United States

ISBN: (纸本)0780379675

This paper introduces trust region methods into power system state estimation. The traditional Newton (Gauss-Newton) method is not always reliable particularly in the presence of bad data, topological or parameter errors. The motivation was to enhance convergence properties of the state estimator under those conditions, and together with QR factorization to make a globally convergent and reliable algorithm. The trust region formulation shows that such a model is more robust then the traditional Newton (Gauss-Newton). The algorithm has been programmed and applied to representative power networks, and the computational requirement has been found. © 2003 IEEE.

关键词： State estimation

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A Miniaturized ISFET-Based Blood pH Sensing Device for Home Care Use

A Miniaturized ISFET-Based Blood pH Sensing Device for Home ...

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2022 IEEE MIT Undergraduate Research Technology Conference, URTC 2022

作者： Buckley, Evan Geyster, Joshua Larkin, Benjamin Guler, Ulkuhan Worcester Polytechnic Institute Department of Electrical and Computer Engineering WorcesterMA01609 United States

ISBN: (纸本)9781665473453

This article presents the design of a miniaturized, minimally-invasive blood pH sensing device for medical point-of-care applications. Blood pH is a vital marker for determining respiratory and metabolic health. Abnormal blood pH levels indicate that the body's natural buffer system is out of balance, which may imply serious health issues, such as kidney damage, pneumonia, or heart failure. This work utilizes an Ion Sensitive Field Effect Transistor (ISFET) to measure the pH of a liquid solution with a future focus on blood pH measurements. We designed a readout circuit to convert the changing threshold voltage of the ISFET, based on the solution's pH level, to a pH measurement displayed on the device's screen in real-Time. With its portable size and its ability to accurately measure with a minimal amount of solution, this device may be a more convenient alternative for home use when compared to the current state-of-The-Art blood pH measurement techniques. © 2022 IEEE.

关键词： Threshold voltage

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