Motorola

About: Motorola is a company organization based out in Schaumburg, Illinois, United States. It is known for research contribution in the topics: Signal & Communications system. The organization has 27298 authors who have published 38274 publications receiving 968710 citations. The organization is also known as: Motorola, Inc. & Galvin Manufacturing Corporation.

Method and apparatus for reducing round-trip latency and overhead within a communication system

Abstract: During operation radio frames are divided into a plurality of subframes. Data is transmitted over the radio frames within a plurality of subframes, and having a frame duration selected from two or more possible frame durations.

Video coding using the H.264/MPEG-4 AVC compression standard

Abstract: H.264/MPEG-4 AVC is a recently completed video compression standard jointly developed by the ITU-T VCEG and the ISO/IEC MPEG standards committees. The standard promises much higher compression than that possible with earlier standards. It allows coding of non-interlaced and interlaced video very efficiently, and even at high bit rates provides more acceptable visual quality than earlier standards. Further, the standard supports flexibilities in coding as well as organization of coded data that can increase resilience to errors or losses. As might be expected, the increase in coding efficiency and coding flexibility comes at the expense of an increase in complexity with respect to earlier standards. In this paper, we first briefly introduce the video coding tools that the standard supports and how these tools are organized into profiles. As with earlier standards, the mechanism of profiles allows one to implement only a desired subset of the standard and still be interoperable with applications of interest. Next, we discuss how the various video coding tools of the standard work, as well as the related issue of how to perform encoding using these tools. We then evaluate the coding performance in terms of contribution to overall improvement offered by individual tools, options within these tools, and important combinations of tools, on a representative set of video test sequences and movie clips. Next, we discuss a number of additional elements of the standard such as, tools that provide system support, details of levels of profiles, and the issue of encoder and decoder complexity. Finally, we summarize our overview and analysis of this standard, by identifying, based on their performance, promising tools as well as options within various tools. r 2004 Elsevier B.V. All rights reserved.

Ray tracing as a design tool for radio networks

Abstract: Efficient radio ray tracing programs developed particularly for reflector-rich environments are described. These image-based, dual-grid, scalar, coherent, ray tracing programs generate maps, (two-dimensional slices) of three-dimensional standing wave patterns for continuous wave illumination. The calculated maps are used to estimate system coverage quality in a macroscopic sense and to investigate design alternatives regarding antenna beamwidths, boresight orientations, spatially averaged signal strengths, and so forth. The programs run fast enough on engineering workstation to support indoor radio system design, but not fast enough for interactive use. Examples are given to illustrate the use of the programs. >

Securing the AES Finalists Against Power Analysis Attacks

Abstract: Techniques to protect software implementations of the AES candidate algorithms from power analysis attacks are investigated. New countermeasures that employ random masks are developed and the performance characteristics of these countermeasures are analyzed. Implementations in a 32-bit, ARM-based smartcard are considered.