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MultiBand OFDM (MB-OFDM) is a short-range wireless technology that permits data transfers at very high rates, between 53.3 and 480 Mbps. MB-OFDM uses the already licensed radio spectrum, between 3.1 GHz – 10.6 GHz, in an unlicensed manner, i.e. without a licensing cost or control. MB-OFDM divides the spectrum allocated to UWB into 14 bands of 528 MHz. Each OFDM symbol is transmitted across a band...
The implementation of high quality complex wireless sensor networks requires a good level of flexibility both at compile-time (configuration) and at run-time (management). The twofold goal is on one hand to improve the overall “fitness” of the application implemented to the changing environment and on the other hand to limit the footprint of the software. This paper presents a flexible and lightweight...
Much work have been done lately to develop complex motor control systems. However they always rely on a physical drive/motor/encoder setup for experimental results. This paper presents a hardware DC motor emulator that can be synthesized to FPGAs. The emulator is intended to replace an actual DC motor during the development phase of motor controllers. A torque based input is required and incremental...
Sum of Absolute Difference (SAD) is a low complexity distortion metric widely employed in the mode decision stage of real-time video encoders. In H.264/AVC encoding, the state-of-the-art video coding standard, motion estimation responds for the most computational complexity, most of it coming from the SAD calculation for all the candidate blocks. Considering an H.264/AVC motion estimation hardware...
Relentless advances in IC technologies have fueled steady increases on fabricated component density and work frequencies. As feature sizes decrease to nanometer scales, an increase in switching activity per unit of area and time is observed. When extreme switching activity occurs in a small region of an integrated circuit, malfunctions may be caused either as a consequence of a decrease in bias levels...
In microprocessor-based systems, evaluating the criticality of registers is required in order to achieve the expected dependability level with respect to soft errors and to guide selective improvements for a given application program. Methods have been proposed to perform such criticality evaluations at compile time. Several criteria can be used. We analyze in this paper the impact of compilation...
The suitability of the recently proposed Quasi-Floating Gate (QFG) technique for processing physiological signals, and specially to stabilize baseline wandering in a simple and efficient manner, is addressed. As an example of the usefulness of these techniques in biomedical signal processing, an ECG preamplifier is designed, fabricated in a 0.5µm CMOS process, and tested. Measurement results confirm...
Mismatch shaping is a commonly used technique for shaping the noise created by mismatch errors in over-sampled digital-to-analog converters. Mismatch shaping techniques reported thus far operate with the signal band located at a fixed frequency. This paper presents a simple architecture for arbitrarily tuning the center frequency of a first-order mismatch shaping transfer function. Details of hardware...
This paper presents a new two-stage CIC decimation filter. The original CIC filter is replaced by a two-stage CIC structure where both sections are realized in a nonrecursive form. Using the polyphase decomposition, the subfilters of both sections are operated at a lower rate resulting in a fast and a low power structure. The magnitude response of this filter is improved by using the stepped-triangular...
Complex embedded systems application exhibit time-varying workload which requires continuous resource adaptivity. Workload prediction has been successfully achieved through a hybrid model of NARX Recurrent Neural Networks combined with Self Organizing Map (SOM). This paper presents the performance evaluation of this hybrid time series prediction on embedded processors as an alternative to dedicated...
In this paper we designed a new CMOS readout circuit for high-resolution infrared focal plane array (FPA) applications. Substance of material in this circuit is MCT (Mercury Cadmium Telluride). In this circuit, the integration capacitor is placed outside of the unit pixel, reducing the pixel area and allowing integrating the current on larger capacitance for larger charge storage capacity. One of...
This paper presents the design of a high-sensitivity parallel plates accelerometer intended to inertial navigation. Common issues of the parallel plates topology have been addressed to improve the sensor capacitive sensitivity and resolution. A sensitivity of 350 pF/g and a sub-40µg/sqHz resolution have been achieved through simulation. As this sensor will be operated in closed-loop mode with electrostatic...
Information theoretical learning (ITL) has recently been proved to be an efficient tool for developing new adaptive filtering algorithms. The starting point of this approach is the use of an information theoretical cost function. The most widely used family of algorithms in this class is the minimum error entropy (MEE). Linear and nonlinear adaptive filters from MEE family have better overall performance...
In this paper, we present an analysis of VoIP (Voice over IP) traffic and data transfer using PLC (PowerLine Communications) network. We propose a model based on MMFM (Markov Modulated Fluid Models) for data traffic and VoIP in PLC networks. Simulations and comparisons were carried out with other models such as Poisson and MMPP (Markov Modulated Poisson Process). The results were obtained by experiments...
A simple approach for the design, fabrication and characterization of a operational trasconductance amplifier intended for work in low power applications is reported in this work. DC Measured parameters agree with simulation results and specifications. An application for the designed OTA is also tested.
A millimeter-wave PA (Power Amplifier) based on a 65nm CMOS technology from STMicroelectronics has been designed. It is optimized to deliver the maximum OCP1 (Output Compression Point) equal to 12dBm. The targeted feature is the unlicensed band around 60GHz suitable for Wireless Personal Area Network application (WPAN). Considering that constraints, one-tone simulations are not sufficient to characterize...
A novel LNA with integrated notch filter for multi-band, multi-standard cellular communication is presented in this paper. The LNA is capable to serve multiple FDD bands of the LTE standard and its cobanded UMTS counterparts. Due to its architecture also TDD bands including GSM bands DCS1900 and PCS1800 and LTE TDD bands can be covered. Due to the integrated notch filter which is reused for all covered...
CMOS downscaling and recent advances in Single-Electron devices — such as Single-Electron Transistors (SET), foreseen the combination of both devices in hybrid systems. Despite the current problems in manufacturing single-electron structures, there is an increasing need for improving the design-path of these systems by tackling several aspects, among them, device modelling for hybrid simulation. This...
Real time rendering of three-dimensional scenes in high photorealistic detail is a hard task, such as in the Ray Tracing rendering algorithm. However, parallel implementations of Ray Tracing have been enabling real time performance, as the algorithm is embarrassingly parallel. Thus, a custom parallel design in hardware is likely to achieve an acceptable performance. In this paper, we propose a hardware...
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