Traditional multimedia systems deal with only a few basic media: text, graphics, audio and video. However , many other types of media, such as ultra-sound, infrared and RF signals, can be represented by streams of data samples and processed within mul-timedia applications. In this paper, we introduce some of these new media domains and identify interesting… (More)
This thesis presents the design, implementation, and analysis of an adaptive wireless network that is capable of dynamically modifying the physical layer of its wireless links. Nodes in such a network are able to change many aspects of the physical layer, including coding, modulation, and multiple access. With this technology, a wireless network can… (More)
A cluster of commodity personal computers (PCs) is an attractive platform for signal processing, especially for applications like sensor arrays where there is significant paral-lelism in the computation. This paper reports the results of experiments with several small cluster configurations to explore the opportunities and limitations of this approach.… (More)
Status Release Date Comment Audience Draft 0.0.1 11/03/03 Initial Draft, limited release, do not distribute Limited Release Draft 1.0.0 RC1 05/17/04 Updated per comments Limited Release Draft 1.0.0 RC2 05/28/04 Updated per comments Limited Final 1.0.0 RC3 As a key component of the President's Management Agenda, the U.S. E-Authentication Identity Federation… (More)
An NC 1 circuit for division of binary numbers is presented. By results of Beame, Cook and Hoover this also shows that iterated product and powering are in NC 1 , and by a result of Borodin all three operations are in log-space. This settles an open issue in parallel and space bounded arithmetic complexity.
Vanu, Inc. has demonstrated analog FM two way radio and digital APCO Project 25 waveforms on an iPAQ-based handheld software radio. The iPAQ contains a low-power 206 MHz StrongARM processor that is used for all signal processing. This paper explains the software approaches used and lessons learned from implementing the waveforms on this platform. Commercial… (More)
In this thesis we investigate efficient modulation and detection techniques for the up-link (i.e. transmission from mobile to base station) of a DS-CDMA network. Specifically , the thesis contains three parts. In the first part, we focus on the mobile transmitter. In particular, we evaluate and compare the spectral efficiency of two promising variable rate… (More)
The author hereby grants to MIT permission to reproduce and BARKER distribute publicly paper and electronic copies of this thesis d cMSBn'st 1,s INSTITUTE OFITECH NM "r-y in w h ole or in p art.
A dual channel broadband surface mount optical modulator driver has been developed for use in 100Gb/s fiber optic transponders. Each channel is capable of delivering 4 to 8Vpp to each port of the optical modulator at data rates spanning through 43Gb/s with adjustable crossing point and eye quality control. This surface mount package solution enables a more… (More)
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