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In this paper we propose a two-way spectrum sharing protocol for the overlay cognitive radio network consisting of two primary users (PUs) and two secondary users (SUs). One of the SUs acts as a relay to assist the communication between the PUs while at the same time allowing for two-way transmission with the other SU. The communication process is done in two phases. In the first phase, the PUs and...
In this work, bit error rate analysis of amplify-and-forward cooperative spatial modulation (SM) systems with multiple antennas at relay and destination is investigated. Most of the studies in the literature of cooperative SM systems deal with the space shift keying (SSK), which is a special case of SM, and consider the single receive antenna at relay and destination. As it is known, the error performance...
The capacity analysis of the spatial modulation (SM) scheme is different than that of the multiple-input multiple-output (MIMO) systems. Since the information is conveyed not only through the M-ary constellation domain but also through the antenna domain, the capacity of SM is expressed as the sum of the capacities of these two domains. Due to this summation, the outage probability of SM differs from...
Spatial modulation (SM) is a novel and promising approach that has been introduced as an alternative to classical multiple-input multiple-output (MIMO) spatial multiplexing techniques. Cooperative communications, on the other hand, provides additional diversity gains and high data rates by improving coverage. Combining the advantages of SM and cooperative communications would then further improve...
Polar codes are the first explicit class of codes that are provably capacity-achieving under the successive cancelation (SC) decoding. As a suboptimal decoder, SC has quasi-linear complexity N(1 + log N) in the code length N. In this paper, we propose a new non-binary SC decoder with reduced complexity N/2(1 + log N/2) based on the folding operation, which was first proposed in [11] to implement folded...
In this paper, we propose efficient maximum-likelihood (ML) decoding for binary Kronecker product-based (KPB) codes. This class of codes, have a matrix defined by the n-fold iterated Kronecker product Gn = F⊗n of a binary upper-triangular kernel matrix F, where some columns are suppressed given a specific puncturing pattern. Polar and Reed- Muller codes are well known examples of such KPB codes. The...
This paper considers a two-way relay network in which two source nodes exchange messages during two time slots with the help of a half-duplex amplify- and-forward relay node. Closed form expressions of source and relay node powers are obtained by solving an optimization problem which aims to minimize system total power by constraining source nodes' received signal-to-noise ratios (SNR). Furthermore,...
This paper considers a two-way relay network in which two source nodes exchange messages during two time slots with the help of a half-duplex amplify-and-forward relay node. Closed form expressions of source and relay node powers are obtained by solving an optimization problem which aims to minimize system total power by constraining source nodes' received signal-to-noise ratios (SNR), thus satisfying...
Multicasting is a spectrally efficient method for supporting multimedia communication by allowing transmission of packets to multiple destinations using fewer resources. To incorporate cooperative (distributed MIMO) diversity, Cooperative Extended Balanced Space-Time Block Codes (CEBSTBCs) have been proposed providing full diversity when one or more feedback bits are sent back via feedback channel...
To incorporate Multi-Input Multi-Output diversity, Extended Balanced Space-Time Block Codes (EBSTBCs) have been proposed in the literature, providing full diversity when one or more feedback bits are sent back via feedback channel. However, the EBSTBCs are designed for unicast communication. Multicasting is a spectrally efficient method for supporting group communication by allowing transmission of...
Many tracking algorithms have difficulties dealing with occlusions and background clutters, and consequently don't converge to an appropriate solution. Tracking based on the mean shift algorithm has shown robust performance in many circumstances but still fails e.g. when encountering dramatic intensity or colour changes in a pre-defined neighbour hood. In this paper, we present a robust tracking algorithm...
In this paper, we present a family of order-statistics based vector filters for the removal of impulsive noise from color images. These filters preserve the edges and fine image details by switching between the identity (no filtering) operation and a robust order-statistics based filter operation based on the univariate median operator. Experiments on a diverse set of images and comparisons with state-of-the-art...
Color space transformations are frequently used in image processing, graphics, and visualization applications. In many cases, these transformations are complex nonlinear functions, which prohibits their use in time-critical applications. In this paper, we present a new approach called Minimax Approximations for Color-space Transformations (MACT). We demonstrate MACT on two commonly used color space...
Dynamic backgrounds and sudden illumination changes are two of the major problems associated with background subtraction techniques. In this paper, we present a novel approach to background subtraction that addresses both of these challenges. In particular, we present an improved codebook background modelling and subtraction technique. We utilise image segmentation on the background image and model...
In this paper, antenna selection both at the transmitter and the receiver is proposed for space-time coded (STC) orthogonal frequency division multiplexing (OFDM) systems. Antennas for all-subcarriers or per-subcarrier are selected to maximize the signal to noise ratio (SNR) at the receiver which knows the channel state information perfectly and the transmitter only knows the indices of the selected...
Accurate identification of lesion borders is an important task in the analysis of dermoscopy images since the extraction of skin lesion borders provides important cues for accurate diagnosis. Snakes have been used for segmenting a variety of medical imagery including dermoscopy, however, due to the compromise of internal and external energy forces they can lead to under- or over-segmentation problems...
In this paper, we present a classification method of dermoscopy images between melanocytic skin lesions (MSLs) and non-melanocytic skin lesions (NoMSLs). The motivation of this research is to develop a pre-processor of an automated melanoma screening system. Since NoMSLs have a wide variety of shapes and their border is often ambiguous, we developed a new tumor area extraction algorithm to account...
This paper describes a study of Turkish-English cross language information retrieval (CLIR) system. One of the biggest issues with CLIR studies is to access to bi-lingual parallel corpus. So, the first step of this study was to construct a parallel Turkish-English corpus. We have constructed a corpus that has 1801 parallel documents. The corpus has been divided in to two parts, first one for training...
This paper reviews the feedback and expected outcomes for the surveyed students of the Syrian virtual university (SVU) in designing and implementation of e-learning based on Australian flexible learning framework (AFLF). This research used soft systems methodology (SSM) to analyze and understand the complex and 'messy' situation of the current case study. The study emphasizes the effective use of...
Due to the issues like fraudulent use, loss or damage with using credit cards, researchers are focused on developing alternative payment methods. A simple but yet versatile and secure electronic payment technology could be implemented by the use of Mobile Telephones, that will eliminate the security related problems due to the use of card based electronic payment devices. In this paper, we illustrate...
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