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This paper discusses channel estimation in a cooperative orthogonal frequency-division multiplexing (OFDM) network in the presence of frequency offsets. Both the amplifyand-forward (AF) and decode-and-forward (DF) relaying modes are... more
This work considers two-way relay channels (TWRC), where two terminals transmit simultaneously to each other with the help of a relay node. For single antenna systems, we propose several new transmission schemes for both... more
A spatial-resolution reduction based framework for incorporation of a Wyner-Ziv frame coding mode in existing video codecs is presented, to enable a mode of operation with low encoding complexity. The core Wyner-Ziv frame coder works on... more
The problem of searching for aperiodic binary sequences with high entropy and uniform element distribution presents significant computational complexity, particularly as the sequence length increases. Such sequences are of crucial... more
Informal Workers across Europe: Evidence from 30 Countries * The European Social Survey data are used to analyze informal employment at the main job in 30 countries. Overall, informality decreases from South to West to East to North.... more
Labour Force Survey (2000) data are used to estimate returns to education in Estonia, Latvia and Lithuania. Results are compared with evidence from other countries. We also discuss gender, ethnic, and urban-rural gaps in payoff to... more
There are few studies examining the relationship between psychopathology and positive experiences and traits. Although initial studies suggest persons with posttraumatic stress disorder (PTSD) are at increased risk for excessive social... more
The intent of H.264 (MPEG-4 Part 10) was to achieve equivalent quality to previous standards (e.g., MPEG-2) at no more than half the bit-rate. H.264 is commonly felt to have achieved this objective. This document presents results of an... more
The distinguished feature of fixed backbone nodes in the wireless mesh networks (WMNs) can be utilized to design an efficient cross layer which cooperates routing and scheduling schemes for increasing end-to-end throughput. With only... more
Congestion is one of the major problems that affects on throughput, delay, losses and other performance metrics of the network. During the last decade, several congestion control protocols have been proposed to overcome this problem. The... more
Study of Analysis of Multiple Input and Multiple outputs (MIMO) Technology in Wireless Communication
In wireless communication, mobile technology is progressive and in this system 4 th generation is the latest at present. 4G mobile, aims to provide an effective solution for the next generation mobile usefulness. Fourth Generation mobile... more
With the proliferation of wireless multimedia applications, multicast/broadcast has been recognized as an efficient technique to transmit a large volume of data to multiple mobile stations at the same time. In most multicast systems, the... more
The success of the Magnetospheric Multiscale mission depends on the accurate measurement of the magnetic field on all four spacecraft. To ensure this success, two independently designed and built fluxgate magnetometers were developed,... more
This paper investigates hardware cyber-security risks associated with channel decoders, which are commonly acquired as a black box in semiconductor industry. It is shown that channel decoders are potentially attractive targets for... more
In the context of multimedia wireless transmission, a link adaptation strategy is proposed, assuming that the source decoder may accept some remaining errors at the output of the channel decoder. Based on a mean bit error rate for... more
HAL is a multi-disciplinary open access archive for the deposit and dissemination of scientific research documents, whether they are published or not. The documents may come from teaching and research institutions in France or abroad, or... more
We propose an efficient IP-block-based design environment for high-throughput VLSI systems. The flow generates SystemC register-transfer-level (RTL) architecture, starting from a Matlab functional model described as a netlist of... more
The network scenario is that of an infrastructure IEEE 802.11 WLAN with a single AP with which several stations (STAs) are associated. The AP has a finite size buffer for storing packets. In this scenario, we consider TCP controlled... more
Genetic therapies have shown recent promise in alleviating some of the cognitive issues associated with some genetic disorders; however, these therapies may come with significant health and socio-ethical concerns, particularly when they... more
We consider the energy-minimal joint cooperator set selection and power assignment problem in a cooperation scenario with multiple relays, under transmit power constraints, while satisfying a target frame error rate (FER) at the... more
A secret sharing scheme is a protocol by means of which a dealer distributes a secret s amonga set of participants P in such a way that only qualified subsets of P can reconstruct the valueof s whereas any other subset of P; non-qualified... more
In this paper we propose a novel Space Division Multiplexing (SDM) detection method. The proposed technique constitutes a list search method and may be regarded as an advanced extension of the Sphere Decoder (SD). Our method may be... more
Although many energy-aware routing schemes have been proposed for wireless ad hoc networks, they are not optimized for networks with heterogeneous power supplies, where nodes may run on battery or be connected to the mains (grid network).... more
Atmospheric turbulence causes severe performance degradation in free space optical communication links. However, by using a reliable low bandwidth wireline or radio frequency link in parallel, the performance of such links can be improved... more
Multi-carrier modulation (MCM) scheme such as Orthogonal Frequency Division Multiplexing (OFDM), is a popular method for high data rate wireless transmission. This paper proposes a novel transmit power allocation for MCM. This technique... more
Sensor-cloud computing is envisioned to be one of the key enabling technologies for remote health monitoring. Integration of sensed data into cloud applications in sensor-cloud will help in real-time monitoring of patients over... more
Technique for selective localization of four-photon mixing and its use for physical parameter extraction in fiber is described. The measurement method relies on localized countercolliding power transfer and was applied to map dispersion... more
This article will report the development of new application of the Sum-Alpha stopping criterion to the case of logmaximum a posterioru Log-MAP turbo decoding. It shows how to adapt Sum-Alphas quantities when using the Log-MAP algorithm... more
Wyner-Ziv video coding (WZVC) is a newly emerged video coding scheme which compresses the input video frames with the side information (SI) frames only available at the decoder. WZVC exploits the statistics between the source frame and... more
This letter presents a new and efficient digital baseband architecture for impulse radio ultra wideband (IR-UWB) transceivers with reconfigurable capacities for wireless sensor network (WSN) applications. An implementation is done on FPGA... more
Avhandlingen är uppdelad i två delar. Del I analyserar kapacitet för linjära modulationssystem med en bärvåg. Kapaciteten är en övre gräns på antalet bitar som kan överföras under en användning av kommunikationskanalen, och uppnås utav... more
Avhandlingen är uppdelad i två delar. Del I analyserar kapacitet för linjära modulationssystem med en bärvåg. Kapaciteten är en övre gräns på antalet bitar som kan överföras under en användning av kommunikationskanalen, och uppnås utav... more
Quantum Key Distribution (QKD) protocols based on higher-order MUBs (Maximally Unbiased Bases), potentially displaying improved range-security performance, are optically realized for higher (>2) dimensions and/or for multiple (>2)... more
In this paper, we consider the downlink heterogeneous scenario with highly transmit correlated channels, and propose two kinds of the statistical channel state information (SCSI) aided proportional fair scheduling (PFS) schemes: (1)... more
Second generation terrestrial digital video broadcasting (DVB-T2) standard aims at providing high definition television and high rate services for the same spectrum allocation of current DVB-T standard. This goal is achieved by adopting... more
In an intermittent-connectivity network, there rarely exists a connected path between a source node and its destination. These networks arise frequently when each node has a limited transmission range, such as a communication network... more
In the information-theoretic literature, it has been widely shown that multicell processing is able to provide high capacity gains in the context of cellular systems and that the per-cell sum-rate capacity of multicell processing systems... more
In this paper, a framework for recognizing network traffic in order to detect anomalies is proposed. We propose to combine and correlate parameters from different layers in order to detect 0-day attacks and reduce false positives.... more
A dissertation presented to The Department of Social Work School of Human and Community Development Faculty of Humanities University of Witwatersrand In fulfilment of the requirements for the degree Masters of Arts in Social Work March 2016
This paper outlines a novel iterative decoding technique for a rate K/N convolutional code based on recurrent neural network (RNN) with stopping criterion. The algorithm is introduced by describing the theoretical models of the encoder... more
This paper discusses the performance comparison of different algorithms for classification, estimation and filtering problems. Two information theoretic measures, namely, the empirical mutual information and the asymptotic information... more
The experimental demonstration of radio-over-fiber Wimedia-defined OFDM ultrawide band (OFDM-UWB) wireless transmission in fiber-to-the-home (FTTH) networks using standard single-mode fiber with lengths ranging from 25 to 100 km is... more
The experimental demonstration of radio-over-fiber Wimedia-defined OFDM ultrawide band (OFDM-UWB) wireless transmission in fiber-to-the-home (FTTH) networks using standard single-mode fiber with lengths ranging from 25 to 100 km is... more
Far-end crosstalk (FEXT) is the major limitation to achieve high data rates in very high bit rate digital subscriber line (VDSL) systems. Full crosstalk cancellation (FCC) techniques have been proposed to mitigate the effect of crosstalk.... more
Conventional medium access control protocols are designed to avoid simultaneous transmissions, based on a simple collision model in the underlying physical layer. Recently, strong physical layer capabilities, enabled by multiuser... more