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An Efficient Algorithm for Improving Precision of Multi-Cell Channel Estimation systems

Procedia engineering 2012年 41卷 367-376页

作者： Ali K. Marzook A. Ismail B.M. Ali A. Sali S. Khatun Computer andCommunication Systems Department Universiti Putra Malasia Serdang 43400 Malaysia Institute of Advanced Technology Universiti Putra Malasia Serdang 43400 Malaysia School of Computer and Communication System Engineering Universiti Malasia Perlis Malaysia

A new multi-cell joint channel estimation technique for uplink TD-SCDMA system is proposed. The Channel impulse responses of the serving cell and the effective neighboring cell users will process jointly. The new technique adopts the singular value decomposition criterion to reduce the rank order of the system channel matrix. Depending on a limited number of the real parameters that need it to describe the channel matrix, the estimation process will be efficient and the reduced rank technique can significantly improve the channel estimation accuracy. Simulation results show clearly that the proposed reduced rank estimator can significantly improve the channel estimation accuracy for multi-cell networks under rank-deficient consideration. The mean square error (MSE) measure has shown the validity performance of the proposed estimator over the conventional estimators. In addition, the correlation coefficient measures of the reduced rank estimators have shown slightly the superiority of the proposed technique.

关键词： TD-SCDMA systems multi-cell joint channel estimation reduced rank techniques SVD algorithm Steiner algorithm

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An improved MAC protocal for marine-environment monitoring WSN system

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Journal of Networks 2012年第11期7卷 1900-1907页

作者： Xu, Lizhong Zhang, Jiahua Li, Hua Harry Ye, Pengfei Yan, Xijun Li, Xiaofang College of Computer and Information Engineering Hohai University Nanjing 210098 China Institute of Communication and Information System Engineering Hohai University Nanjing 210098 China Computer Engineering Department San Jose State University San Jose CA 95192 United States

To meet the demand of the energy consumption, transmission bandwidth, high reliability and real-time transmission for marine-environment monitoring networks, we propose a Real-Time Data Duty Cycle Adaptive (RDDCA) algorithm to improve the Medium Access Control (MAC) layer of IEEE802.15.4 wireless communication standard, and design an architecture of Wireless Sensor Network (WSN) with star topology WSN system for monitoring marine-environment based on the RDDCA algorithm. Through the proposed system with sensor nodes, remote sensing terminals and data center, the states of the sensor nodes can be judged dynamically. The decision of whether to change the duty cycle of the transmission data can be made in the Marineenvironment remote sensing terminals. Simulations performed in Network Simulation Version 2 (NS2) show that the star topology based RDDCA algorithm for WSN system can achieve the demands of the marine-environment monitoring applications. Comparing with traditional IEEE802.15.4 standard, it is found that the performance is improved significantly in energy consumption, sensor nodes lifetime, network throughput and real-time performance. © 2012 Academy publisher.

关键词： Sensor nodes

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A dynamic decision model for Smart Grid real time optimal control

A dynamic decision model for Smart Grid real time optimal co...

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IEEE International Energy Conference and Exhibition (EnergyCon)

作者： A. Bonfiglio F. Delfino R. Minciardi R. Procopio M. Robba DYNATECH-Department of Naval Electrical and ICT Engineering University of Genoa Genoa Italy DIST-Department of Communication Computer and System Sciences University of Genoa Genoa Italy

The increased penetration of renewable energy sources and the concept of a dynamic and highly distributed Smart Grid which can intelligently integrate production units, storage systems and connected users opened new challenges in the application of optimization techniques. In this work, a dynamic optimization problem is formulated on a power grid characterized by wind and photovoltaic production units, conventional power plants, biomass co-generation and storage systems. A Model Predictive Control (MPC) scheme is adopted in the dynamic decision model for real time purposes. The decision problem takes into account the network load flows constraints and a state equation related to the state of charge (SOC) of the batteries. Different issues (economic, technical, environmental, security) have been taken into account for the formalization of the objective function. Numerical results are finally reported and discussed.

关键词： Biomass Reactive power Optimization Production Fossil fuels Load flow Power system dynamics

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Self-Optimization of RACH Power Considering Multi-cell Outage in 3GPP LTE systems

Self-Optimization of RACH Power Considering Multi-cell Outag...

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IEEE Vehicular Technology Conference

作者： Wonbo Lee Dongmyoung Kim Seunghyun Choi Kyung-Joon Park Sunghyun Choi Ki-Young Han School of Electrical Engineering and INMC Seoul National University Korea Department of Electrical Engineering and Computer Science University of Michigan USA Department of Information and Communication Engineering DGIST Korea System Lab. Next Generation System Team Samsung Electronics Korea

ISBN: (纸本)9781467309899

Self-organizing network (SON), which is an essential technology of future radio networks, is proposed in the 3GPP Long Term Evolution (LTE) specification as a usage case. In this paper, we focus on user equipment (UE)'s power control considering interference mitigation and retransmission constraints especially for physical random access channel (PRACH) of LTE. When a UE initially accesses an evolved-NodeB (eNB), it sends a preamble with an initial access level, and raises the power by a fixed step whenever the preamble was not detected by the eNB. We present an analysis and simulation to study the tradeoff relationship between inter-cell interference and retransmission according to the PRACH power setting, i.e., the initial target received power and power ramping step, assuming Rayleigh fading channels. Furthermore, we propose an algorithm tracing the optimal power setting that minimizes the resource wastage of the cell in consideration and its adjacent cells satisfying the constraint of retransmission and failure probability bound.

关键词： Self-Optimization RACH Power Considering Multi-cell Outage 3GPP LTE systems RETRANSMISSION Local thermodynamic equilibrium Long Term Evolution 3GPP Energy sources disturbance suppression inter-cell interference adaptive optimization Radio networks Power (Psychology) failure probability Access levels

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A New Ultrasound Pulser Technique for Wide Range Measurements

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Journal of Physics: Conference Series 2013年第1期423卷

作者： M S Salim M F Abd Malek N M Noaman Naseer Sabri Latifah Mohamed K M Juni School of Mechatronics Eng. University Malaysia Perlis01000 Malaysia School of Electrical System Eng. University Malaysia Perlis01000 Malaysia Electrical and Electronics Engineering Department Gulf University Bahrain Kingdom School of Computer and Communication Eng. University Malaysia Perlis Perlis 01000 Malaysia Electrical Engineering Department Politeknik Tuanku Syed Sirajudain Malaysia

The objective of this research was to design and implement a new ultrasonic pulse-power-decay technique that transmits multiple ultrasound pulses through slurry to determine the lowest concentration that can provide an accurate attenuation measurement. A wide measurement range is obtained using the pulsed-power-decay transmission technique, and regardless of the material used to construct the container. A signal in the receiver transducer provides the attenuation measurements, for each echo, a fast Fourier transform (FFT) of the appropriate signal was obtained and compared with the water signals to yield the attenuation as a function of frequency. The data show the feasibility of measuring a kaolin concentration of 5% wt. When using a commercial pulser with the same device setting, no detectable echo was observed. Therefore, new technique measurements may prove useful in detecting solid content in liquid. This study demonstrated that the proposed pulsed-power transmission technique is promising for evaluating low concentrations of solids in fluids and for measuring sedimentation in solid-liquid systems.

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A Novel Approach for Raising the Accuracy of SVDD

A Novel Approach for Raising the Accuracy of SVDD

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International Conference on Computing, Measurement, Control and Sensor Network (CMCSN)

作者： Chi-Kai Wang I-Hsuan Huang Chao-Hsing Hsu Department of Logistics Management National Defense University Management College Taipei Taiwan Department of Industrial and System Engineering Chung Yuan Christian University Chungli Taiwan Department of Computer and Communication Engineering Chienkuo Technology University Taiwan

This paper presents a novel one-class classification method to improve the correct proportion by adding new outliers. General speaking, it is difficult to improve the correct proportion of the one-class classification because of few data. How to distinguish the target objects correctly from unknown samples becomes one of the most important problems. The support vector data description (SVDD) is a method proposed to solve the problem of one-class classification. It models a hyper sphere around the target set, and by the introduction of kernel functions, more flexible descriptions are obtained. In SVDD, the width parameter and the penalty parameter have to be given beforehand by the user. To automatically optimize the values for these parameters, the error on both the target and outlier data has to be estimated. Because no outlier examples are available, we propose a max-min range method for generating artificial outliers in this paper. By generating artificial outliers around the target set, the accuracy of classifiers will improve. At the last, we use four benchmark data sets: Iris, Wine, Balance-scale, and Ionosphere data base to validate the approach in this research indeed has better classification result.

关键词： Support vector machines Training Error analysis Machine learning Standards Educational institutions

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Optimization of Power Consumption for Centrifugation Process Based on Attenuation Measurements

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Journal of Physics: Conference Series 2013年第1期423卷

作者： M S Salim M F Abd Malek Naseer Sabri M Iqbal bin Omar Latifah Mohamed K M Juni School of Mechatronics Eng. University Malaysia Perlis 01000 Malaysia School of Electrical System Eng. University Malaysia Perlis01000 Malaysia School of Computer and Communication Eng. University Malaysia Perlis Perlis 01000 Malaysia Electrical Engineering Department Politeknik Tuanku Syed Sirajudain Malaysia

The main objective of this research is to produce a mathematical model that allows decreasing the electrical power consumption of centrifugation process based on attenuation measurements. The centrifugation time for desired separation efficiency may be measured to determine the power consumed of laboratory centrifuge device. The power consumption is one of several parameters that affect the system reliability and productivity. Attenuation measurements of wave propagated through blood sample during centrifugation process were used indirectly to measure the power consumption of device. A mathematical model for power consumption was derived and used to modify the speed profile of centrifuge controller. The power consumption model derived based on attenuation measurements has successfully save the power consumption of centrifugation process keeping high separation efficiency. 18kW.h monthly for 100 daily time device operation had been saved using the proposed model.

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A very small novel patch antenna design for WLAN application

A very small novel patch antenna design for WLAN application

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2012 IEEE International Workshop on Antenna Technology, iWAT 2012

作者： Zulkefli, M.S. Malek, F. Jamlos, M.F. Juni, K.M. Idris, M.S. Saleh, M.I.M. Mat, M.H. Ronald, S.H. School of Electrical System Engineering Universiti Malaysia Perlis Blok A Tingkat Satu Taman Seberang Jaya Fasa 3 02000 Kuala Perlis Perlis Malaysia School of Computer and Communication Engineering Universiti Malaysia Perlis Jalan Satu Taman Seberang Jaya Fasa 3 02000 Kuala Perlis Perlis Malaysia Electrical Engineering Department Politeknik Tuanku Syed Sirajuddin Pauh Putra 02600 Arau Perlis Malaysia

ISBN: (纸本)9781467300360

In this paper, a very small 2.45 GHz printed antenna suitable for WLAN application is proposed. In order to decrease the size of the antenna, multi-layer substrate and shorting plate method are used. A microstrip line which can lead to a good impedance matching and four pairs of slot are used to obtain acceptable value of return loss at the desired frequency. These techniques are used as a mean that they can be applied in this antenna design and also can give an effect on the antenna characteristics. This antenna shows an omni-directional radiation pattern similar to that of a monopole antenna. © 2012 IEEE.

关键词： Microstrip antennas

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Conversational gaze mechanisms for humanlike robots

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ACM Transactions on Interactive Intelligent systems 2012年第2期1卷 1–33页

作者： Mutlu, Bilge Kanda, Takayuki Forlizzi, Jodi Hodgins, Jessica Ishiguro, Hiroshi Department of Computer Sciences University of Wisconsin-Madison 1210W. Dayton St. Madison WI 53706 United States Intelligent Robotics and Communication Laboratories ATR 2-2-2 Hikaridai Soraku-gun Seika-cho Kyoto 619-0224 Japan Human-Computer Interaction Institute Carnegie Mellon University 5000 Forbes Ave. Pittsburgh PA 15213 United States Robotics Institute Carnegie Mellon University 5000 Forbes Ave. Pittsburgh PA 15213 United States Department of System Innovation Graduate School of Engineering Science Osaka University 1-3 Machikaneyama Toyonaka Osaka Japan

During conversations, speakers employ a number of verbal and nonverbal mechanisms to establish who participates in the conversation, when, and in what capacity. Gaze cues and mechanisms are particularly instrumental in establishing the participant roles of interlocutors, managing speaker turns, and signaling discourse structure. If humanlike robots are to have fluent conversations with people, they will need to use these gaze mechanisms effectively. The current work investigates people's use of key conversational gaze mechanisms, how they might be designed for and implemented in humanlike robots, and whether these signals effectively shape human-robot conversations. We focus particularly on whether humanlike gaze mechanisms might help robots signal different participant roles, manage turn-exchanges, and shape how interlocutors perceive the robot and the conversation. The evaluation of these mechanisms involved 36 trials of three-party human-robot conversations. In these trials, the robot used gaze mechanisms to signal to its conversational partners their roles either of two addressees, an addressee and a bystander, or an addressee and a nonparticipant. Results showed that participants conformed to these intended roles 97% of the time. Their conversational roles affected their rapport with the robot, feelings of groupness with their conversational partners, and attention to the task. © 2012 ACM.

关键词： Human robot interaction

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Economic and environmental performances quantification of the university of Genoa Smart Polygeneration Microgrid

Economic and environmental performances quantification of th...

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IEEE International Energy Conference and Exhibition (EnergyCon)

作者： Stefano Bracco Federico Delfino Fabio Pampararo Michela Robba Mansueto Rossi DIMSET-Department of Machinery Energy Systems and Transportation University of Genoa Italy DYNATECH-Department of Naval Electrical and ICT Engineering University of Genoa Italy DIST-Department of Communication Computer and System Sciences University of Genoa Italy

Nowadays, one of the most important research lines on smart power grids and microgrids is related to the evaluation of how such active infrastructures can increase energy efficiency, minimize greenhouse gases emissions and contribute to a deeper penetration of renewable energy sources. To investigate this issue, several test-bed facilities/demonstrators have been designed and are now running or under construction all over the world in order to perform experimental research and testing. Among them, it is important to cite the Smart Polygeneration Microgrid (SPM) developed by the University of Genoa at Savona Campus facilities. The present paper describes the SPM structure and proposes a general method to estimate its economic and environmental benefits connected with the use of renewable energy sources and cogeneration plants; in particular, the attention is focused on the SPM running costs, the CO 2 emissions and the primary energy use. The calculation method is explained in details, referring to the “winter configuration” of the SPM trigeneration system.

关键词： Cogeneration Turbines Boilers Natural gas Economics Educational institutions Production

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