For the transport of multicast video, the use of multi-layered coding is one of the most promising techniques. To avoid feedback implosion at the source due to the control packets returned by the receivers, the network has to implement packet merging at intermediate nodes. We propose in this paper the direct algorithm that performs the merging procedure in only one loop. This algorithm is optim...

adapt to various targets and datasets. The objective was to design an efficient computer vision system that can learn to detect multiple targets in large images with unknown backgrounds. Because the target size is small relative to the image size in this problem, there are many regions of the image that could potentially contain the target. A cursory analysis of every region can be computationa...

This paper presents a new method for detecting and classifying a predefined set of hand gestures using a single transmitter and a single receiver utilizing a linearly frequency modulated ultrasonic signal. Gestures are identified based on estimated range and received signal strength (RSS) of reflected signal from the hand. Support Vector Machine (SVM) was used for gesture detection and classifi...

When considering low-frequency sources, the oceanic environment can act as a very dispersive waveguide, especially in shallow-water long-range sound wave propagation. One efficient tool for studying dispersion effects is based on time-frequency (TF) analysis of the received signals using a single receiver [1,2] . However, theses studies only considered two-dimensional (2-D) waveguides. In the p...

This paper demonstrates a real-time software receiver supporting GPS/WAAS dual-frequency (L1/L5) processing. The software receiver is implemented on a widely-available recent generation multi-core processor and is capable of post-processing datasets from collection hardware. Key contributions of this software receiver are that 1) it is perhaps the first receiver capable positioning solely on L5...

In this paper, we report on the design and experimental results of a fix-tuned Superconductor-Insulator-Superconductor (SIS) mixer for Atacama Large Millimeter/submillimeter Array (ALMA) band 8 (385-500GHz) receivers. Nb-based SIS junctions of a current density of 10kA/cm and one micrometer size (fabricated with a two-step lift-off process) are employed to accomplish the ALMA receiver specifica...

Space-time codes were designed for fading environments in order to improve system capacity and/or to achieve a diversity gain. In this paper, a novel possible application of the Alamouti space-time block code (STBC) for two transmit antennas is investigated, to provide a switchless alternative in current resilient microwave radio links. Resilient means that transmitter (Tx) and receiver (Rx) ar...

ABSTRACT Spectral hole burning reduces sodium laser guide star efficiency. Due to photon recoil, atoms that are initially resonant with the single-frequency get Doppler shifted out of resonance, which return flux. Frequency-chirped (also known as frequency-swept) continuous-wave lasers have potential mitigate effect spectral and even increase efficiency beyond theoretical limit a laser. We inve...