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检索条件"主题词=Change Detection Algorithms"

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Efficient ARQ error control strategies with adaptive packet length for mobile radio networks

Efficient ARQ error control strategies with adaptive packet ...

引用

International Conference on Universal Personal Communications

作者： A. Annamalai V.K. Bhargava Department of Electrical and Computer Engineering University of Victoria Victoria BC Canada

The throughput of conventional ARQ protocols, such as the stop-and-wait, go-back-N and selective-repeat, can be improved by dynamically adapting the protocol packet length with the changes in channel conditions. Such an action requires a method for sensing the channel state and detecting a change in it. This paper examines four simple algorithms to implement such an adaptive system in a slowly varying mobile radio channel. It is shown that these algorithms performs remarkably well in spite of their simplicity. In particular, the algorithm based on counting the contiguous positive and/or negative acknowledgment messages provides a reliable channel state information (CSI) within only a few block transmissions, and requires the shortest observation interval among the four schemes.

关键词： Automatic repeat request Error correction Programmable control Adaptive control change detection algorithms Protocols Throughput Adaptive systems Land mobile radio Channel state information

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A new algorithm for P-wave detection in the ECG signal

A new algorithm for P-wave detection in the ECG signal

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Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC)

作者： Hee-Kyo Joeng Kwang-Keun Kim Sun-Chul Hwang Myoung-Ho Lee Department of Electrical Engineering Yonsei University Seoul South Korea

An algorithm is presented for P-wave detection in the ECG signal. The peak and valley points are obtained by using a significant point extraction algorithm with a nine-point derivative. Because P-wave duration is a changing tendency according to heart rate, the R peak is first searched and the R-R interval time calculated prior to the determination of the threshold value of P-wave duration, in order to adapt to the change of P-wave duration actively. The parameter values are determined for P-wave detection, and then the P peak, P onset, and P offset are detected by these parameters values. The results obtained from the proposed algorithm have a detection accuracy of more than 90%.< >

关键词： Electrocardiography Heart rate detection Heart rate Adaptive signal detection change detection algorithms Morphology Data mining Equations Engineering in medicine and biology Societies

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A Highly Linear Direct-Conversion Transmit Mixer Transconductance Stage with Local Oscillation Feedthrough and I/Q Imbalance Cancellation Scheme

A Highly Linear Direct-Conversion Transmit Mixer Transconduc...

引用

IEEE International Conference on Solid-State Circuits (ISSCC)

作者： C.P. Lee A. Behzad Dayo Ojo M. Kappes S. Au Meng-An Pan K. Carter S. Tian Broadcom San Diego CA IQ-Analog San Diego CA Broadcom Irvine CA

A linear transconductance stage with process insensitive gain control and gain insensitive output offset current is proposed. A calibration scheme to remove the LO feedthrough (LOFT) and I/Q imbalance is also introduced. The prototype achieves 3 rd -order IMD suppression better than 52dBc, LOF suppression better than 32dBc, and image rejection better than 46dBc for all gain settings. The transmit chain achieves an 802.11a EVM of < -40dB

关键词： Transconductance Baseband Envelope detectors Wireless LAN Radio transmitters Circuits Gain control change detection algorithms Gold Local oscillators

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Design of MAC protocols with less collision fast resolution for WLAN

Design of MAC protocols with less collision fast resolution ...

引用

Consumer Communications and Networking Conference, CCNC IEEE

作者： Ye Yan DongSun Park Department of Infor.& Comm. Chonbuk National University of Korea Jeonju Jeonbuk South Korea

ISBN: (纸本)0780387848

Development of efficient medium access control (MAC) protocols providing both high throughput performance for data traffic and good quality of service (QoS) support for real-time traffic is the current major focus in distributed contention-based (DCF) MAC protocol research. In this paper, we propose a novel and efficient contention-based MAC protocol for wireless local area networks, namely, the less collision fast resolution (LCFR) algorithm. This algorithm is developed based on the following innovative ideas: to reduce probability of collision and speed up the backoff procedure. We actively redistribute the backoff timers for all active nodes and reduce the backoff timers exponentially fast. The MAC protocol with this new algorithm attempts to provide significantly higher throughput and low latency performance for data services in wireless LANs than the IEEE 802.11 MAC algorithm. We demonstrate that this algorithm indeed resolves collisions faster and reduces the idle slots more effectively.

关键词： Media Access Protocol Wireless LAN Access protocols Road accidents Throughput Communication system traffic control Quality of service Wireless application protocol change detection algorithms Delay

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detection and Tracking of Multiple Moving Objects in Real-World Scenarios using Attributed Relational Graph

Detection and Tracking of Multiple Moving Objects in Real-Wo...

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Canadian Conference on Computer and Robot Vision, CRV

作者： Wei Huang Q.M. Jonathan Wu Department of Electrical and Computer Engineering University of Windsor Windsor ONT Canada

This paper presents a new algorithm for detecting and tracking multiple moving objects in both outdoor and indoor environments. The proposed method measures the change of a combined color-texture feature vector in each image block to detect moving objects. The texture feature is extracted from DCT frequency domain. An attributed relational graph (ARG) is used to represent each object, in which vertices are associated to an objectpsilas sub-regions and edges represent spatial relations among them. Multiple cues including color, texture, and spatial position are integrated to describe each objectpsilas sub-regions. Object tracking and identification are accomplished by inexact graph matching, which enables us to track partially occluded objects and to cope with object articulation. An ARG adaptation scheme is incorporated into the system to handle the changes in object scale and appearance. The experimental results prove the efficiency of the proposed method.

关键词： Object detection Motion detection Hidden Markov models Active shape model Computer vision change detection algorithms Indoor environments Tracking Principal component analysis Object recognition

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Probabilistic Sensor Deployment in Wireless Sensor Network: A New Approach

Probabilistic Sensor Deployment in Wireless Sensor Network: ...

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International Conference on Advanced Communication Technology (ICACT)

作者： Md. Obaidur Rahman Md. Abdur Razzaque Choong Seon Hong Networking Lab Department of Computer Engineering Kyung Hee University South Korea

Wireless sensor network has the two major tasks: sensing & detecting of any event over a sensing region. Quality of network coverage entirely depends upon the success of these tasks. Network coverage can be degraded after sensor deployment due to sensor's finite energy. So, it is a decisive task to identify those regions of a network where further deployment of sensor is required to improve the quality of network coverage. Exposure is a probabilistic concept and it determines the probability of detecting any event by the sensors. In this paper we proposed a new approach to find out least covered regions in a sensor network where further sensor deployment is desirable. This approach used some graph-theory based algorithm. In order to improve the network coverage the proposed technique of this paper gives a noticeable performance. The experimental output of the proposed approach is a satisfied one for the improvement quality of network coverage. Moreover in case of sensing or detecting, use of closest sensor of a cluster to a particular point of event makes the overall computation less expensive for the proposed technique.

关键词： Wireless sensor networks Event detection Clustering algorithms Clustering methods Computer networks Electronic mail Degradation change detection algorithms Joining processes Monitoring

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Detecting changes over Time in a Knowledge Sharing Community

Detecting Changes over Time in a Knowledge Sharing Community

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IEEE WIC ACM International Conference on Web Intelligence (WI)

作者： Styliani Kleanthous Vania Dimitrova School of Computing University of Leeds UK

There is an establishing trend towards the socialization of the web. Virtual communities are becoming very popular web spaces for collaboration and knowledge sharing. However, studies have shown that virtual communities may often be ineffective and may not sustain. We propose a novel approach for community-tailored support which is aimed at facilitating processes important for the community’s effectiveness and sustainability. The paper presents algorithms for detecting evolution patterns of community knowledge sharing behavior. The algorithms are applied to a model of an existing closely-knit community, and used to identify when and what intelligent interventions may be needed to support the functioning of the community as an entity.

关键词： Intelligent agent Virtual colonoscopy Collaboration Monitoring Data analysis Cognitive science Communities change detection algorithms Conferences Time sharing computer systems

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Improved 3D video synthesis combining graph cuts and chroma key technology

Improved 3D video synthesis combining graph cuts and chroma ...

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3DTV Conference

作者： Kosmas Dimitropoulos Theodoros Semertzidis Nikos Grammalidis Informatics and Telematics Institute Centre for Research and Technology Hellas Thessaloniki Greece

Depth information is essential for 3DTV applications, as it is used for rendering in many modern 3D displays. In this paper, we propose a new approach for 3DTV content synthesis, by integrating an existing state-of-the-art MRF-based disparity estimation method with additional pre- and post-processing steps. The key of the proposed method is the decomposition of the scene in foreground and background. To this end, chroma key technology is used to facilitate the detection of foreground objects and to significantly improve depth estimation for these objects. Then, we can combine the foreground objects with any background, for both color images and depth maps, to generate a new representation of the scene. Experimental results have shown that the proposed approach can produce satisfactory depth maps with improved silhouettes for foreground objects and a stable background for all the frames of the sequence.

关键词： Layout Three dimensional displays Calibration Cameras Object detection Color change detection algorithms Noise robustness Informatics Telematics

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Analysis of Belief Propagation for Non-Linear Problems: The Example of CDMA (or: How to Prove Tanaka's Formula)

Analysis of Belief Propagation for Non-Linear Problems: The ...

引用

IEEE (first ITW conference of the year) Information Theory Workshop (ITW)

作者： A. Montanari D. Tse Laboratoire de Physique Théorique de l'Ecole Normale Supérieure France Department of Electrical Engineering and Computer Science University of California USA

We consider the CDMA (code-division multiple-access) multi-user detection problem for binary signals and additive white gaussian noise. We propose a spreading sequences scheme based on random sparse signatures, and a detection algorithm based on belief propagation (BP) with linear time complexity. In the new scheme, each user conveys its power onto a finite number of chips l̄, in the large system limit. We analyze the performances of BP detection and prove that they coincide with the ones of optimal (symbol MAP) detection in the l̄ → ∞ limit. In the same limit, we prove that the information capacity of the system converges to Tanaka's formula for random 'dense' signatures, thus providing the first rigorous justification of this formula. Apart from being computationally convenient, the new scheme allows for optimization in close analogy with irregular low density parity check code ensembles.

关键词： Belief propagation Multiaccess communication Multiuser detection Parity check codes Iterative decoding Computer science Additive white noise Mutual information change detection algorithms Performance analysis

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Impact of Bit-Width Specification on the Memory Hierarchy for a Real-Time Video Processing System 06

Impact of Bit-Width Specification on the Memory Hierarchy fo...

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Design, Automation and Test in Europe Conference and Exhibition

作者： B. Thornberg M. O'Nils Mid-Sweden University Sundsvall SWEDEN

ISBN: (纸本)9783981080100

Bit-width specification will affect the total memory storage requirement of a video processing system. However, what is not so obvious is that the bit-width specification will also affect the design of the memory hierarchy. Experiments with a real-life surveillance system show how the optimal allocation of shift registers for the storage of intermediate results is sensitive to bit-widths. It is shown that the total on-chip memory storage requirement can be reduced by 61 percent compared to a non-optimal design

关键词： Real time systems Surveillance Digital signal processing Pixel Delay Cameras change detection algorithms Signal processing algorithms Clocks Pipelines

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