Smart antenna technology is a promising means to overcome signal impairments in wireless personal communications. When spatial signal processing achieved through smart antennas is combined with temporal signal processing, the space-time processing can mitigate interference and multipath to yield higher network capacity, coverage, and quality. In this dissertation, we propose a dual smart antenn...

An OT-combiner takes n candidate implementations of the oblivious transfer (OT) functionality, some of which may be faulty, and produces a secure instance of oblivious transfer as long as a large enough number of the candidates are secure. We see an OT-combiner as a 2-party protocol that can make several black-box calls to each of the n OT candidates, and we want to protect against an adversary...

A fast directional switch (FADIS) is described, which allows controlled switching of high-power microwaves between two outputs. A possible application could be synchronous stabilization of neoclassical tearing modes (NTM). Generally, the device can be used to share the installed EC power between different types of launchers or different applications (e.g. in ITER, midplane / upper launcher). Th...

In this paper, we analyze the performance of a new cooperative diversity scheme based on best relay selection with interferences at relay nodes, only relay node can be affected by interference. For the selection scenario, only a best relay that maximizes the end-toend received signal-to-interference and noise ratio (SINR) at the destination is selected to forward the information. Through statis...

A companion paper has proposed a new diversity combining scheme, adaptive RAKE diversity (ARD), for differential PSK direct sequence code division multiple access (DS/CDMA) mobile communications systems. In the ARD system, the demodulated signals in the time window for path diversity combining are unequally weighted and combined. The values of the weight coefficients are determined so that the ...

We study the security of the concatenation combiner H1(M)‖H2(M) for two independent iterated hash functions with n-bit outputs that are built using the Merkle-Damg̊ard construction. In 2004 Joux showed that the concatenation combiner of hash functions with an n-bit internal state does not offer better collision and preimage resistance compared to a single strong n-bit hash function. On the other...

In this paper we study the issue of how to scale machine learning algorithms, that typically are designed to deal with main-memory based datasets, to eeciently learn models from large distributed databases. We have explored an approach called meta-learning that is related to the traditional approaches of data reduction commonly employed in distributed database query processing systems. We explo...

This paper proposes an endpoint video combiner architecture in a multipoint control unit (MCU) system for high definition multiparty video conferencing. The proposed architecture addresses the current reliability, computational and quality drawbacks of a conventional centralized based video combiner architecture. This is achieved by redesigning the MCU video to move away the video combiner from...