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2005 International Symposium on Low Power Electronics and design

作者： Ma, Dongsheng Wang, Janet M. Somasundaram, Mohankumar N. Hu, Zongqi Integrated System Design Laboratory Electrical and Computer Engineering Department University of Arizona Tucson AZ 85721 United States Digital VLSI Design Laboratory Electrical and Computer Engineering Department University of Arizona Tucson AZ 85721 United States

This paper presents an integrated power system for low-power wireless sensor networks with dynamic efficiency optimization technique. By adaptively resizing power transistors and adjusting switching frequency, system efficiency is enhanced significantly. Theoretical analysis is elaborated to support the proposed technique. A prototype integrated power system for self-powered photovoltaic wireless sensing node was designed and simulated with TSMC 0.35μm CMOS process. With a power range of 0.5μW to 10mW, power efficiency stays above 71%. Tolerance between theoretical and simulated optimal power transistor sizes is less than 6.7%, while that of optimal switching frequencies is less than 5%. The paper gives another solution to minimizing system power in the perspective of power processing. Copyright 2005 ACM.

关键词： Power electronics

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High throughput vlsi architecture for H.264/AVC context-based adaptive binary arithmetic coding(CABAC) decoding

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Journal of Zhejiang University-Science C(computers and Electronics) 2013年第6期14卷 449-463页

作者： Kai HUANG De MA Rong-jie YAN Hai-tong GE Xiao-lang YAN Institute of VLSI Design Zhejiang University State Key Laboratory of Computer Science Institute of SoftwareChinese Academy of Sciences Hangzhou C-Sky Micro-System Company

Context-based adaptive binary arithmetic coding(CABAC) is the major entropy-coding algorithm employed in H.264/*** this paper,we present a new vlsi architecture design for an H.264/AVC CABAC decoder,which optimizes both decode decision and decode bypass engines for high throughput,and improves context model allocation for efficient external memory *** on the fact that the most possible symbol(MPS) branch is much simpler than the least possible symbol(LPS) branch,a newly organized decode decision engine consisting of two serially concatenated MPS branches and one LPS branch is proposed to achieve better parallelism at lower timing path cost.A look-ahead context index(ctxIdx) calculation mechanism is designed to provide the context model for the second MPS branch.A head-zero detector is proposed to improve the performance of the decode bypass engine according to UEGk encoding *** addition,to lower the frequency of memory access,we reorganize the context models in external memory and use three circular buffers to cache the context models,neighboring information,and bit stream,respectively.A pre-fetching mechanism with a prediction scheme is adopted to load the corresponding content to a circular buffer to hide external memory *** results show that our design can operate at 250 MHz with a 20.71k gate count in SMIC18 silicon technology,and that it achieves an average data decoding rate of 1.5 bins/cycle.

关键词： H.264/AVC Context-based adaptive binary arithmetic coding(CABAC) Decoder vlsi

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architecture of timing synchronization for MIMO-OFDM WLAN systems

Architecture of timing synchronization for MIMO-OFDM WLAN sy...

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2008 4th IEEE International Conference on Circuits and systems for Communications, ICCSC

作者： Cho, Jongmin Huynh, Trong Anh Kim, Jinsang Cho, Won-Kyung Computer System Architecture and VLSI Design Laboratory Department of Electronics and Radio Engineering Kyung Hee University 1 Seocheon Kihung Yongin Kyungki 449-701 Korea Republic of

ISBN: (纸本)9781424417087

In this paper, we present a timing synchronization scheme of the next generation IEEE 802.11n wireless LAN standard which is based on MIMO-OFDM technique. The proposed timing synchronization method takes two steps which consist of two modified auto-correlators. For coarse timing synchronization, a sliding window differentiator is used after a conventional auto-correlation in order to avoid plateau problem. The conjugate symmetry property of L-LTS is used for fine timing synchronization. Since cross-correlation based methods are not required, the computational complexity and the number of multiplier can be reduced. In order to reduce the hardware complexity, we have used sign comparators (SC) instead of using multipliers. Based on simulation results, the proposed method outperforms a conventional method. The proposed scheme can be applied to IEEE 802.11n systems and can easily be expanded to frequency synchronization scheme. ©2008 IEEE.

关键词： Orthogonal frequency division multiplexing

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architecture of Timing Synchronization for MIMO-OFDM WLAN systems

Architecture of Timing Synchronization for MIMO-OFDM WLAN Sy...

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IEEE International Conference on Circuits and systems for Communications (ICCSC)

作者： Jongmin Cho Huynh Trong Anh Jinsang Kim Won-Kyung Cho Computer System Architecture & VLSI Design Laboratory Department of Electronics and Radio Engineering Kyung Hee University Yongin si Kyunggi South Korea

In this paper, we present a timing synchronization scheme of the next generation IEEE *** wireless LAN standard which is based on MIMO-OFDM technique. The proposed timing synchronization method takes two steps which consist of two modified auto-correlators. For coarse timing synchronization, a sliding window differentiator is used after a conventional auto-correlation in order to avoid plateau problem. The conjugate symmetry property of L-LTS is used for fine timing synchronization. Since cross-correlation based methods are not required, the computational complexity and the number of multiplier can be reduced. In order to reduce the hardware complexity, we have used sign comparators (SC) instead of using multipliers. Based on simulation results, the proposed method outperforms a conventional method. The proposed scheme can be applied to IEEE 802.1 In systems and can easily be expanded to frequency synchronization scheme.

关键词： Timing Wireless LAN Frequency synchronization OFDM Autocorrelation Hardware MIMO computer architecture Very large scale integration Laboratories

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Lightweight Task-Oriented Semantic Communication Empowered by Large-Scale AI Models

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IEEE Transactions on Vehicular Technology 2025年

作者： Liu, Chuanhong Guo, Caili Yang, Yang Chen, Mingzhe Quek, Tony Q. S. Beijing University of Posts and Telecommunications Beijing Key Laboratory of Network System Architecture and Convergence School of Information and Communication Engineering Beijing100876 China Beijing University of Posts and Telecommunications Beijing Laboratory of Advanced Information Networks School of Information and Communication Engineering Beijing100876 China University of Miami Department of Electrical and Computer Engineering Institute for Data Science and Computing Coral GablesFL United States Singapore University of Technology and Design Dept. of Information Systems Technology and Design 487372 Singapore

Recent studies have focused on leveraging large-scale artificial intelligence (LAI) models to improve semantic representation and compression capabilities. However, the substantial computational demands of LAI models pose significant challenges for real-time communication scenarios. To address this, this paper proposes utilizing knowledge distillation (KD) techniques to extract and condense knowledge from LAI models, effectively reducing model complexity and computation latency. Nevertheless, the inherent complexity of LAI models leads to prolonged inference times during distillation, while their lack of channel awareness compromises the distillation performance. These limitations make standard KD methods unsuitable for task-oriented semantic communication scenarios. To address these issues, we propose a fast distillation method featuring a pre-stored compression mechanism that eliminates the need for repetitive inference, significantly improving efficiency. Furthermore, a channel adaptive module is incorporated to dynamically adjust the transmitted semantic information based on varying channel conditions, enhancing communication reliability and adaptability. In addition, an information bottleneck-based loss function is derived to guide the fast distillation process. Simulation results verify that the proposed scheme outperform baselines in term of task accuracy, model size, computation latency, and training data requirements. © 1967-2012 IEEE.

关键词： NP-hard

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Hardware-efficient auto-correlation for synchronization of MIMO-OFDM WLAN systems

Hardware-efficient auto-correlation for synchronization of M...

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International SoC design Conference, ISOCC

作者： Jongmin Cho Youngmin Cho Mohammad Rakibul Islam Jinsang Kim Won-Kyung Cho Computer System Architecture & VLSI Laboratory Department of Electronics and Radio Engineering Kyung Hee University Yongin si Gyeonggi South Korea

ISBN: (纸本)9781424450343;9781424450350

This paper presents a hardware-efficient autocorrelation scheme for the synchronization of MIMO-OFDM based wireless local area network (WLAN) systems, such as IEEE 802.11n. Carrier frequency offset (CFO) estimation for the frequency synchronization requires high complexity autocorrelation operations of many training symbols. In order to reduce the hardware complexity of the MIMO-OFDM synchronization, we propose an efficient correlation scheme based on time-multiplexing technique and the use of reduced samples while preserving the performance. Compared to a conventional architecture, the proposed architecture requires only 27% logic gates and 22% power consumption with acceptable BER performance loss.

关键词： Autocorrelation Wireless LAN Frequency synchronization OFDM Hardware Very large scale integration MIMO Timing Frequency estimation Energy consumption

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On disjoint covers and ROBDD size

On disjoint covers and ROBDD size

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IEEE Pacific Rim Conference on Communications, computers and Signal Processing

作者： E.V. Dubrova D.M. Miller Electronic System Design Laboratory Department of Electronics KTH-Electrum Royal Institute of Technology Sweden VLSi Design and Test Group Department of Computer Science University of Victoria Victoria BC Canada

ISBN: (纸本)0780355830

The relation between the number of nodes in a ROBDD and the number of implicants in the disjoint cover of the function represented by that ROBDD is studied. We identify a class of functions for which there are disjoint covers such that a cover of a larger size can be represented by a ROBDD with a smaller number of nodes. This shows that the size of a ROBDD is not a monotonically increasing function of the size of the disjoint cover.

关键词： Data structures Boolean functions Electronic equipment testing Input variables Circuits Very large scale integration system testing computer science Adders Polynomials

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Doppler diversity for OFDM wireless mobile communications. Part I: frequency domain approach

Doppler diversity for OFDM wireless mobile communications. P...

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IEEE Conference on Vehicular Technology (VTC)

作者： Byung-Chul Kim I-Tai Lu System Architecture Design Laboratory TN Business Samsung Electronics Company Limited Suwon Gyeonggi South Korea Department of Electrical and Computer Engineering Polytechnic University Melville NY USA

ISBN: (纸本)0780377575

A novel frequency domain Doppler diversity technique for OFDM systems is proposed. The received OFDM signal is first frequency shifted to generate various diversity branches. After demodulation, branch outputs are individually weighted and added together. For Doppler spread signal, it alters fading statistics and improves the bit error rate. Extensive simulations show that combining three diversity branches with proper frequency shifts reduces BER by an order when the normalized Doppler spread is larger than 0.3.

关键词： OFDM Wireless communication Mobile communication Frequency domain analysis Diversity reception Frequency diversity Bit error rate Signal generators Demodulation Fading

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Rapid prototyping of neonatal jaundice detector using skin optics theory

Rapid prototyping of neonatal jaundice detector using skin o...

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IEEE EMBS Conference on Biomedical Engineering and Sciences (IECBES)

作者： Zulfadhli Osman Afandi Ahmad Azlan Muharam Bioelectronics and Instrumentation Research Laboratory (BioEI) Universiti Tun Hussein Onn Malaysia (UTHM) Batu Pahat Johor Malaysia Department of Computer Engineering Universiti Tun Hussein Onn Malaysia (UTHM) Batu Pahat Johor Malaysia VLSI Architecture and Systems Design Research Laboratory Universiti Tun Hussein Onn Malaysia (UTHM) Batu Pahat Johor

When newborns present with jaundice, various clinical assessment need to be executed including evaluation of the history, physical examination, and assessment of severity of jaundice. This project concerns with the quantification of neonatal jaundice level using Simulink model-based design. It is important to address that the proposed method is non-invasive, hence suitable for infants. In this project, the concentration level of bilirubin in dermis layer of skin has been detected using skin optic theory with light emitting diode (LED) and photodiode as a detector. To evaluate the proposed system, a mock skin soaking is used to replace the real infant's skin. At the system level, Arduino Uno has been used as a hardware platform, whilst MATLAB and Simulink have been fully utilised to implement the system's architecture. An evaluation of the proposed systems reveals its capability to detect, process and display real-time results with three (3) levels of jaundice, including normal, mild and critical.

关键词： Skin Pediatrics Photodiodes Light emitting diodes Conferences Optics Blood

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A reconfigurable routing method for fault-tolerant mesh-based network on chip

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Journal of Information and Computational Science 2013年第1期10卷 157-165页

作者： Liu, Yanhua Ruan, Ying Lai, Zongsheng Sun, Ling Institute of Microelectronics Circuit and System East China Normal University Shanghai 200241 China Jiangsu Provincial Key Lab. of ASIC Design Nantong University Nantong 226019 China State Key Laboratory of Computer Architecture Institute of Computing Technology Chinese Academy of Sciences Beijing 100190 China

As the semiconductor industry advances to nano-technology points, Network on Chip (NoC) components are becoming vulnerable to errors during the system operation. Consequently, fault-tolerant techniques for NoC are needed to achieve high reliability. In this paper, we present a fault-tolerant routing method to tolerate faulty routers in a two-dimension (2D) mesh-based NoC. With this method, the system can have a multi-router fault-tolerant capability and the routing path can be dynamically reconfigured to support different situations caused by faulty routers in NoC. Fault-tolerance capability and system performance of the proposed method are evaluated through analysis and simulations. Theoretical analysis and simulation results show that the proposed method can enhance the reliability of system and offer considerable fault-tolerance capability. © 2013 by Binary Information Press.

关键词： Network-on-chip

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