The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
It is shown analytical and simulation results on the performance of legacy IEEE 802.11a time synchronization algorithms when the synchronization preamble is transmitted by IEEE 802.11n devices with multiple transmitting antennas using cyclic shift diversity. It is concluded that an auto-correlation synchronization scheme allows the legacy compatibility over AWGN and fading channels.
In this paper, we propose a simplified Log-MAP algorithm that is equivalent to the Log-MAP algorithm in terms of the bit-error-rate (BER) performance, but without its implementation difficulties. The proposed algorithm is based on a linear approximation of the correction function in the Log-MAP algorithm over different signal-to-noise ratio (SNR) regions. This approximation is simple to implement...
Changes in pedality can occur in animals due to injury, congenital defects, or behaviour. Here, an attempt is made to reproduce similar conditions on a nominally quadrupedal robot upon losing functionality in one leg, rendering it tripedal. Attention is given to the energy consumption and efficiency during execution quadrupedal amble and basic tripedal walking gaits.
This paper describes the development of a power device characterization curve tracer based on transient thermal measurement. Experimental test set ups along with the required conditions to mitigate the measurement errors are discussed. The measurement algorithms are implemented in LabVIEW environment as a set up controller. The junction temperature is maintained at the specified set point for carrying...
Sophisticated intrusions are evolving everyday. Hence, requirements are changing towards computer systems that provide more robust solutions. However, new issues, bugs, threats and vulnerabilities are unavoidably introduced into the market each time a new product is designed to meet users' specifications. For these reasons, Vendors, research community, network forensics professionals and other users...
In this paper, a motion and balance control scheme is introduced for inverted pendulums using artificial neural network (ANN). The control strategy uses a trade-off strategy to achieve motion tracking and balance control simultaneously with a single controller. Unlike other neural control strategies, no offline learning or a priori system's dynamics knowledge is required. The controller is trained...
The low-level modeling and control of mobile robots that interact forcibly with their environment, such as excavation machinery, is a challenging problem in robotics research. This paper investigates the modeling of a robotic bulldozing operation for the purpose of autonomous control. The distinct operating modes are contained within a hybrid system modeling framework. The dynamics of the individual...
Dedicated tools for placing and routing data flow graphs extracted from computation-intensive applications are basic requirements for developing applications on a large-scale reconfigurable data-path processor (LSRDP) implemented by superconductivity circuits. Using an alternative technology instead of CMOS circuits for implementing such hardware entails considering particular constraints and conditions...
Video codec compresses the input video source to reduce storage and bandwidth requirements while maintaining the quality. There are different video codecs used in the industry today and understanding their operation to target certain video applications is the key to optimization. This paper presents a comparative analysis of the H.264 AVC and the new standard DIRAC PRO/SMPTE-VC2. Compression Ratio,...
We address the problem of minimum average packet delay of Multi-hop Wireless Networks (MWN) which uses network coding. Our objective is to allocate capacities to different wireless nodes in a way that the average packet delay in the network is minimized under the assumption that the network topology, the traffic matrix in the network, and routing are given. Exploiting queueing theory as well as wireless...
Data based approach and methodology for real time diagnosis and prognosis solutions for thermomechanical systems is discussed. Coated turbine blade operation is emulated to sensor online temperature data as the real-time inputs for the software code developed. An algorithm is presented first and extended sampling based statistical hypothesis tests are used for anomaly detection tests. Paired t-test...
In this paper, we discuss the noise contribution of the current source transistors in the charge sensitive amplifier for application in the front-end semiconductor radiation detectors. We developed an analytical methodology that allow to determine the optimum geometry for the current source transistors, so that the current source transistor ends up contributing only a fraction of the input transistor...
We consider a coded cooperative relaying scheme in which two sources communicate with a destination with the assistance of a relay when necessary for improved bandwidth efficiency, reduced energy consumption and enhanced system performance. Based on the decoding status of source signals, the destination decides whether to ask the relay for help. Also, the relay can refuse the destination's request...
While performance and power consumption of processors present a classic trade-off in designing embedded hardware, software can be optimized in favor of both performance and energy. We evaluate the impact of optimizations at different stages of designing embedded software. We show that algorithm choice and compiler optimizations aimed at improving performance can also reduce energy consumption of an...
In this paper, we propose a target localization method in Multiple Input Multiple Output (MIMO) radars with Widely Separated Antenna (WSA)s. Our proposed method is based on the Maximum Likelihood Estimation (MLE). We assume that the time delays between every transmitter-receiver pair antennas are available, maybe through a preprocessing estimation method and the uncertainty on each time delay is modeled...
As the precise wirelength for a given placement can only be known after routing, accurate and fast to compute wirelength estimates are required for FPGA placement algorithms. Two of the more effective wirelength estimation models are HPWL [1] and Star+ [2]. However, both of these models are expensive to compute requiring O(nm) time, where n is the number of nets and m is the average number of blocks...
The design of a buried wideband 3 dB hybrid coupler in Low Temperature Co-fired Ceramics (LTCC) technology is presented. The LTCC process used is briefly described and the electromagnetic field simulation-based design is presented. Particular care is placed on the design and optimization of transmission from the buried stripline coupler to coplanar probing pads at the surfaces. Measured results of...
Vehicular ad hoc network (VANET) is a network that is formed when vehicles with wireless transceiver have the need to communicate with each other. Although VANET shares some similarities with mobile ad hoc network (MANET), the dynamic nature of VANET has posed a challenge in designing routing protocols. This paper shows the performance evaluation between unicast and multicast routing protocols implemented...
Detecting merged motor unit potential trains (MUPTs) during electromyographic (EMG) signal decomposition can assist with improving decomposition results. In addition, such invalid MUPTs must be identified and then either corrected or excluded before extracted MUPTs are quantitatively analyzed. In this work, a support vector machine (SVM) based supervised classifier that evaluates the shapes of the...
The paper examines two major implementations of inertial response in variable-speed wind turbine generators. Through time-domain simulations, these supplementary loops are compared based on their impact on grid frequency and the wind plant. Testing is performed on an isolated, hydro-dominated power system benchmark, to which a DFIG-based wind plant is connected. The results show that when these implementations...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.