Exploring and identifying structure is even more important for multivariate data than univariate data, given the difficulties in graphically presenting multivariate data and the comparative lack of parametric models to represent it. Unfortunately, such exploration is also inherently more difficult.

Multivariate Density Estimation

Year 2009 marks the completion of 50 years of the invention of CORDIC (coordinate rotation digital computer) by Jack E. Volder. The beauty of CORDIC lies in the fact that by simple shift-add operations, it can perform several computing tasks such as the calculation of trigonometric, hyperbolic and logarithmic functions, real and complex multiplications, division, square-root, solution of linear systems, eigenvalue estimation, singular value decomposition, QR factorization and many others. As a consequence, CORDIC has been utilized for applications in diverse areas such as signal and image processing, communication systems, robotics and 3-D graphics apart from general scientific and technical computation. In this article, we present a brief overview of the key developments in the CORDIC algorithms and architectures along with their potential and upcoming applications.

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50 Years of CORDIC: Algorithms, Architectures, and Applications

From the Publisher: 
This is undoubtedly the most accessible book on digital signal processing (DSP) available to the beginner. Using intuitive explanations and well-chosen examples, this book gives you the tools to develop a fundamental understanding of DSP theory. The author covers the essential mathematics by explaining the meaning and significance of the key DSP equations. Comprehensive in scope, and gentle in approach, the book will help you achieve a thorough grasp of the basics and move gradually to more sophisticated DSP concepts and applications.

数字信号处理 = Understanding digital signal processing

Although arithmetic coding offers extremely high coding efficiency, it provides little or no security as traditionally implemented. We present a modified scheme that offers both encryption and compression. The system utilizes an arithmetic coder in which the overall length within the range [0,1) allocated to each symbol is preserved, but the traditional assumption that a single contiguous interval is used for each symbol is removed. Additionally, a series of permutations are applied at the input and the output of the encoder. The overall system provides simultaneous encryption and compression, with negligible coding efficiency penalty relative to a traditional arithmetic coder

Secure Arithmetic Coding

Many countries will experience the effects of an aging population, resulting in a high demand of healthcare facilities. Development of novel biomedical technologies is an urgent necessity to improve diagnostic services for this demographic. Electrocar diogram (ECG) and temperature recording have been used for more than 50 years in medical diagnosis to understand various biological activities [1], [2]. A more recent development, electronic pill technology, requires the integration of more complex systems on the same platform when compared to conventional implantable systems. A small miniaturized electronic pill can reach areas such as the small intestine and can deliver real time video images wirelessly to an external console. Figure 1 shows an electronic pill system (i.e., wireless endoscopy) for a medical monitoring system. The device travels through the digestive system to collect image data and transfers the data to a nearby computer for display with a distance of one meter or more. A high resolution videobased capsule endoscope produces a large amount of data, which can then be delivered over a high-capacity wireless link.

Easy-to-Swallow Wireless Telemetry

This paper presents the design of a highly energy efficient CMOS adiabatic inverter driver (scal-driver). The proposed scal-driver uses a single input stage based on a single transistor driving cross-coupled CMOS inverters which provide the memory function. When implemented on a 0.13 mum CMOS 1.2 V technology, under the large capacitive loading condition (10 pF), scal-driver performs better than the reference adiabatic circuit (cal-driver) in terms of propagation delay (23%), the energy-delay product (40%), and core area (24%).

High performance clocked CMOS adiabatic inverter driver with single stage data input

Security of wireless sensor networks and reliability of the data that they generate is very critical for the intended monitoring and control applications. The information received from a sensor may be compromised because of sensor malfunction, communication link failure, or jamming attacks. This paper proposes an algorithm for locating the compromised sensor within a network of cooperating sensors and disregarding the information it sends to the base station. Thus, the final decision regarding the information collected from the sensors is less affected by the compromised sensors. This helps prevent activating wrong response mechanisms based on the compromised received information. Simulation results show that the proposed algorithm effectively locates the compromised sensors and improves the reliability of the final decision at the base station.

Locating and Disregarding the Information from Compromised Sensors in a WSN

In this paper delay insensitive asynchronous design techniques are employed to implement a mathematical morphology processor in GaAs. A modified version of the DCVSL family is introduced, in order to achieve ultra-fast data rates. Simulation of architecture implementation in GaAs MESFET 0.6pm Vitesse technology demonstrates the reliubility of this ASIC system for high end image processing applications.

https://ieeexplore.ieee.org/iel3/4818/13332/00608842.pdf

Architecture and Design of a Very Fast Real Time Delay Insensitive Asynchronous Morphological

Sensor fusion, in many perception algorithms, requires detections from multiple sensors to be transformed onto a conveniently chosen coordinate system for joint processing. The position and orientation of the sensors need to be determined for the fusion procedure. Two automotive radars installed in the taillight fixtures of a truck are considered in this work and their orientation is defined with respect to the straight line connecting them. We extrinsically calibrate the radar geometry by estimating the rotation (mount angle) and translation parameters that are needed to transform the detections from the radars onto a coordinate system whose origin is at the truck’s hitch ball. This coordinate system is a convenient choice for algorithms which use radars, installed in similar locations, to track or sense the rotation of an attached trailer about the hitch ball. The calibration is performed by rotating a trailer or a platform, upon which corner reflectors (CRs) are placed, about the hitch ball in the direction of both the radars. The algorithm is based on two principles: 1) the use of common detections found in the overlapping field of view (FoV) of the radars to estimate the rotation parameters and 2) a search for the center of trailer/platform rotation to estimate the translation parameters, which define the hitch ball position relative to the radars. It is shown that the use of more radar detections tends to increase the calibration accuracy. The data collected in an experiment result in estimation errors of about 0.20° and 3 cm for the rotation and translation parameters, respectively.

Extrinsic Radar Calibration With Overlapping FoV and Hitch Ball Position Estimation

This paper reports a series of symmetric high performance, low to full swing level converters (udld1-converter to udld5-converter) for recovering signal levels at the receiver end of the global interconnects with large capacitive loads. The proposed udld5-converter provides a matching receiver for the up-down low swing voltage driver (UDLD) signaling style for driving the global interconnect lines. When implemented on 0.13 μm CMOS 1.2 V technology, the udld5-converter performs 16% faster, reduces the energy per switching event by 4%, the energy-delay product by 19%, and the active area by 10%, when compared with a counterpart up low swing voltage driver (ULD) level converter (uld-converter). The proposed level converter receivers, each provide a different performance energy saving trade off. The paper also provides comparative performance evaluation of the various proposed level converters and uld-converter.

Saeid Nooshabadi

Papers

High performance clocked CMOS adiabatic inverter driver with single stage data input

Locating and Disregarding the Information from Compromised Sensors in a WSN

Architecture and Design of a Very Fast Real Time Delay Insensitive Asynchronous Morphological

Extrinsic Radar Calibration With Overlapping FoV and Hitch Ball Position Estimation

On the design and optimization of symmetric low swing to high swing level converter for on-chip interconnects