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The following topics are dealt with: wireless pervasive computing; cooperative communication; physical communication; sensor network; cognitive radio network; ultrawideband communication; vehicle ad hoc network; mobile ad hoc network; wireless personal area network; localization technique; orthogonal frequency-division multiplexing; wireless multimedia service; wireless network; network coding; next...
In this paper, we study the performance of non-cooperative wireless multiple access systems with noisy separated channels, where correlated sources communicate to an access point (AP) in the presence of block-faded links. This is meaningful for pervasive wireless scenarios, e.g., wireless sensor networks, where information may be exchanged between a multitude of nodes. Our goal is to explore the potential...
Firstly, we prove that the probability density function (PDF) of the end-to-end signal-to-noise ratio (SNR) for dual-hop amplify-and-forward (AF) relaying in Nakagami-m fading with non-integer fading parameters given by [1, Theorem 1] diverges near origin for any parameters, which is in contradiction with simulations. Secondly, the reason for the divergence is clarified. Thirdly, closed-form lower...
In some fading environments, there may not be a feedback link sufficiently fast to convey the full channel state information (CSI) to the transmitter. This paper considers a power allocation problem for cooperative relay networks, where the transmitter node knows only the channel distribution information (CDI). The goal is to maximize the ergodic capacity. The application of the Lambert-W function...
While Internet access using mobile or wireless technologies has become ubiquitous these days, the energy consumption aspect of such connections has not been studied in-depth yet. In this paper, a hybrid wireless network, which consists of a cellular component and a relay-assisted ad hoc component, is studied focusing on energy consumption by mobile stations with respect to the amount of data communicated...
In this paper, a protocol for bi-directional cooperative communications applying full-rate distributed space-time codes and physical network coding is proposed. This scheme uses L relays to transmit the codewords in a distributed fashion. It takes 3 time slots for two sources to transmit two corresponding codewords by exploiting physical network coding and self-interference cancelation at each source...
By allowing neighboring nodes to effectively share their available resources, cooperative diversity-based protocols have shown improvements over the traditional routing and medium access control (MAC) protocols. In this work, we observe that while cooperative diversity-based protocols yield performance improvements in the presence of low-quality links, their performance improvements in the presence...
This paper studies the performance of adaptive transmit channel selection in multipath fading channels. The adaptive selection algorithms are configured for single-antenna bandwidth-efficient or power-efficient transmission with as low transmit channel estimations as possible. Due to the fact that the number of active co-channel interfering signals and their corresponding powers experience random...
In this article, we have presented an extensive statistical analysis of the capacity of double1 Nakagami-m channels. The double Nakagami-m channel model has applications in keyhole channels and amplify-and-forward relay based dualhop communication systems in cooperative networks. We have derived exact analytical expressions for the probability density function (PDF), the cumulative distribution function...
In this paper, we have studied the statistical properties of the capacity of spatially correlated multiple-input multiple-output (MIMO) Rice channels. We have derived an exact closed-form expression for the probability density function (PDF) and an exact expression for the cumulative distribution function (CDF) of the channel capacity for single-input multiple-output (SIMO) and multiple-input single-output...
This paper presents a simulation platform that exploits the scalability properties of network simulator-2 (ns-2) for the discrete-event simulation of a telecommunication network, and adopts the open source tool Octave for the discrete-time implementation of adaptive antenna arrays. The physical antenna system, the beamforming algorithm, and the multipath statistic are modeled in detail to accurately...
We propose an approach using the parameterization of extrinsic information transfer (EXIT) functions for symbol mapping design in bit-interleaved coded modulation (BICM-ID). The EXIT function of demapper is parameterized by a weighed sum of binomial functions. The set of binomial functions is then transformed to an orthonormal basis. Based on the parametric approach, the flatness criterion, aiming...
Tailbiting convolutional codes will be used for several applications in new cellular mobile radio systems. This encoding method does not reset the encoder memory at the end of each data block, avoiding the overhead of the zero tail and improving the efficiency, especially when encoding short data blocks. Nevertheless, the absence of a known tail highly increases the complexity of the decoding process...
In this work, we propose an energy-aware wireless sensor MAC protocol for delay-sensitive data transmission. Since energy consumption and delay greatly depend on Channel Monitoring Period and data sensing period at each sensor node, we propose a new preamble structure and a Channel Monitoring Period selection algorithm pursuing an effective tradeoff between energy consumption and delay with a low...
Ship area networks (SANs) have lately attracted attention in order to guarantee the safety of sea travelers and marine transportation. The wireless sensor network (WSN) is one of the most important components of SAN because crew members must know any damage or malfunction of parts of ships promptly. The safety systems are mostly real-time applications, thus delay is the most important QoS requirement...
With the growing demand for real time services in Wireless Sensor Networks (WSNs), quality of service (QoS) based routing has emerged as an interesting research topic. But offering some QoS guarantee in sensor networks raises significant challenges. The network needs to cope with battery constraints, while providing QoS (end-to-end delay and reliability) guarantees. Designing such QoS routing protocols...
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