In this paper we present a framework for recognizing American Sign Language (ASL). The main challenges in developing scalable recognition systems are to devise the basic building blocks from which to build up the signs, and to handle simultaneous events, such as signs where both the hand moves and the handshape changes. The latter challenge is particularly thorny, because a naive approach to ha...

We present new achievable rate regions and code constructions for the symmetric n-channel Multiple Descriptions (MD) coding problem [1] for n > 2. Our approach is inspired by unexplored connections between MD and the problem of distributed source coding [2, 3]. For illustrative clarity, we restrict our focus to the important special case relating to (n, k) source-channel erasure codes [4]. This...

With the advent of the z990 multi-book multiprocessor family of server offerings, significant increases in total system capacity and scalability can be realized. Essential to an increased processing capacity is the corresponding need for significant increases in total I/O scalability and connectivity. With the z990, increased I/O capacity is provided by increasing the number of physical I/O cha...

This dissertation is dedicated to my wife Jijie for her patience, love, encouragement, and support. iii ACKNOWLEDGEMENTS I would like to thank my advisor, Prof. Douglas B. Williams for being a fantastic advisor. Prof. Williams always has great suggestions about research. I have always been greatly inspired by his research style, intellectual aspects, and insights. He has also been a good mentor...

Massive multiple-input multiple-output technology has been considered a breakthrough in wireless communication systems. It consists of equipping a base station with a large number of antennas to serve many active users in the same time-frequency block. Among its underlying advantages is the possibility to focus transmitted signal energy into very short-range areas, which will provide huge impro...

In this paper multiple antenna channel codes, i.e. Space-Time Block Code, Space-Time Trellis Code and SuperOrthogonal Space-Time Trellis Code, are examined in a satellite communication, comparing the gain that the multiple antenna channel coding techniques provide to the communication system. The satellite channel for urban area, modeled as a combination of Rayleigh and log-normal processes wit...

A fuzzy observer based scheme for synchronizing two hyperchaoticoscillators via a scalar transmitted signal for cryptographic application isproposed. The Takagi-Sugeno fuzzy model exactly represents chaotic systems.Based on the general fuzzy model, the fuzzy observer of a chaotic system isdesigned on the basis of the n-shift multiple state based key encryption algorithm.The scalar transmitted s...

In this paper, we investigate the capacity problem of Gaussian fading multiple access relay channel with orthogonal components from the senders to the relay receiver and from the senders and relay to the receiver. This model is motivated by the practical constraint that a node cannot send and receive at the same time or in the same frequency band. We derive a capacity region for the model where...

The paper gives an overview of the multiple-input multiple-output (MIMO) systems and discusses their benefits enabling an increase in the system capacity and an increase of system reliability. The former is attained by signal multiplexing and the later by space encoding. The basic algorithms required for a proper operation of the MIMO systems, i.e. channel estimation, equalisation, optimal and ...

This report investigates channel modeling and estimation for a wired multiuser multicarrier communications system. The special case of a multiple-input multiple-output (MIMO) channel is considered where the different users transmit at the same time and over the same bandwidth. In the report, I will introduce data transmission and training systems. The report also will present a MIMO channel mod...