An information communication method of transmitting a signal is provided that uses a change in luminance. The method includes determining a pattern of the change in luminance by modulating the signal to be transmitted, and transmitting the signal by a light emitter changing in luminance according to the determined pattern. The pattern of the change in luminance is a pattern in which one of two different luminance values occurs in each arbitrary position in a predetermined duration. The determining a pattern of change in luminance includes dividing the predetermined duration into four duration units, so that one of two different luminance value occurs in one duration unit of the four duration units and the other luminance value of the two different luminance value occurs in three duration units of the four duration units, the three duration units are other than the one duration unit.

Information communication method

Discrete event simulators are important scientific tools and their efficient design and execution is the subject of much research. In this paper, we propose a new approach for constructing simulators that leverages virtual machines and combines advantages from the traditional systems-based and language-based simulator designs. We introduce JiST, a Java-based simulation system that executes discrete event simulations both efficiently and transparently by embedding simulation semantics directly into the Java execution model. The system provides standard benefits that the modern Java runtime affords. In addition, JiST is efficient, out-performing existing highly optimized simulation runtimes. As a case study, we illustrate the practicality of the JiST framework by applying it to the construction of SWANS, a scalable wireless ad hoc network simulator. We simulate million node wireless networks, which represents two orders of magnitude increase in scale over what existing simulators can achieve on equivalent hardware and at the same level of detail. Copyright © 2005 John Wiley & Sons, Ltd.

JiST: an efficient approach to simulation using virtual machines†

Optical fiber-based wireless systems and related components and methods are disclosed. The systems support radio frequency (RF) communications with clients over optical fiber, including Radio-over-Fiber (RoF) communications. The systems may be provided as part of an indoor distributed antenna system (IDAS) to provide wireless communication services to clients inside a building or other facility. The communications can be distributed between a head end unit (HEU) that receives carrier signals from one or more service or carrier providers and converts the signals to RoF signals for distribution over optical fibers to end points, which may be remote antenna units (RAUs). In one embodiment, calibration of communication downlinks and communication uplinks is performed to compensate for signal strength losses in the system.

Optical fiber-based distributed antenna systems, components, and related methods for calibration thereof

A multi-faceted design platform (104) acts as a tool for front-end hardware IC designers who design complex core base System on Chip. The design platform (104) uses a network such as the Internet (230) to search and gain access to previously designed virtual core blocks. The design platform (104) provides a means to select (306) and transfer (308) all relevant information regarding the selected virtual core blocks and allows the designer to immediately incorporate the virtual core block into the new SoC design. The design platform (104) further generates the appropriate source code files (320) for immediate use with a plurality of known verification tools to verify both the integration and connectivity of the virtual core blocks as well as the basic functionalities of the SoC design.

Method and system for chip design using remotely located resources

A multi-faceted portal site acts as a server in the context of an n-tier client/ server network, and connects electronic designers and design teams to design and verification tool and service providers on the other through a single portal site. Tools and services accessible to users through the portal site include electronic design automation (EDA) software tools, electronic component information, electronic component databases of parts (or dynamic parts), computing and processing resources, virtual circuit blocks, design expert assistance, and integrated circuit fabrication. Such tools and services may be provided in whole or part by suppliers connected to the portal site. Users accessing the portal site are presented with options in a menu or other convenient format identifying the tools and services available, and are able to more rapidly complete circuit designs by having access to a wide variety of tools and services in a single locale. The portal site may facilitate purchase, lease or other acquisition of the tools and services offered through it. The portal site tracks the movements of users through the portal site in order to learn about the design preferences and design approaches of users individually and in the aggregate. Previous actions taken by the user and by similarly-situated users may be considered in determining which information presented to the user, or in what order to present information to the user, thereby providing contextually-driven access.

Method and system for facilitating electronic circuit and chip design using remotely located resources

WARPED is a publically-available time warp simulation kernel for experimentation and application development. The kernel defines a standard interface to the application developer and is designed to provide a highly configurable environment for the integration of time warp optimizations. It is written in C++, uses the MPI (Message Passing Interface) standard and shared memory for communication, and executes on a variety of platforms including a network of SUN workstations, a SUN SMP workstation, the IBM SP1/SP2 multiprocessors, the Intel Paragon and IBM-compatible PCs running Linux. WARPED is distributed with several applications and includes a sequential kernel implementation for comparative analysis. The kernel supports LP (logical process) clustering, various time warp algorithms and several optimizations that dynamically adjust simulation parameters.

WARPED: a time warp simulation kernel for analysis and application development

Described are a system and a method for optical tracking of assets (figure 1). The system includes a sensor (34) having a plurality of pixels. Each pixel is adapted to produce an electrical signal responsive to an incident optical data signal emitted by an optical tag (18) attached to an asset (14). The system also includes a sensor processor (38) in communication with the sensor (34) and configured to generate an electrical data signal based on optical data signals incident on the pixels. The sensor processor (38) also generates asset data in response to the electrical data signals from the pixels. The sensor (34) and sensor processor (38) can be implemented as an optical communications imager in which each pixel generates a communication data signal based on incident light. Alternatively, the sensor (34) can include a digital video camera or an analog video camera for lower bandwidth communications.

Optical asset tracking system

The design of a Time Warp simulation kernel is made difficult by the inherent complexity of the paradigm. Hence it becomes critical that the design of such complex simulation kernels follow established design principles such as object-oriented design so that the implementation is simple to modify and extend. In this paper, we present a compendium of our efforts in the design and development of an object-oriented Time Warp simulation kernel, called warped. warped is a publically available Time Warp simulation kernel for experimentation and application development. The kernel defines a standard interface to the application developer and is designed to provide a highly configurable environment for the integration of Time Warp optimizations. It is written in C++, uses the MPI message passing standard for communication, and executes on a variety of platforms including a network of SUN workstations, a SUN SMP workstation, the IBM SP1/SP2 multiprocessors, the Cray T3E, the Intel Paragon, and IBM-compatible PCs running Linux.

An Object-Oriented Time Warp Simulation Kernel

Described are an optical sensor and method for receiving communications data in an image. The sensor includes a plurality of pixels. Each pixel includes an optical detector for receiving light in a portion of an image and generating an electrical signal in response to the light. The sensor also included a data communications signal detector in communication with the optical detector to detect communications data in the electrical signal. The data communications signal detector includes a data threshold module for detecting a communications bit when the electrical signal exceeds a threshold value.

Dale E. Martin

Papers

WARPED: a time warp simulation kernel for analysis and application development

Optical asset tracking system

An Object-Oriented Time Warp Simulation Kernel

Optical communication imager

SAVANT/TyVIS/WARPED: components for the analysis and simulation of VHDL