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The electrification of vehicles is now considered an effective solution that will reduce fuel consumption and emissions as well as increase energy security through the diversification of available energy sources. The electric energy generated from low-emission renewable resources will play a vital role to meet the electricity needs of the transportation sector and will also address concerns about...
We consider power allocation (PA) and relay positioning in a dual-hop decode-and-forward relaying system over Nakagami-m fading channels. We investigate adaptive power allocation (PA) with fixed relay location, optimal relay location with fixed power allocation and joint optimization of the PA and relay location under transmit power constraint in order to minimize outage probability and average error...
Cooperative-diversity networks have recently been proposed as an effective technique to form virtual antenna arrays without using collocated multiple antennas. In this paper, we consider the adaptive decode-and-forward (DF) cooperative-diversity system with the Nth best-relay selection scheme. In the best-relay selection scheme, from the set of M relays the best relay only forwards the source signal...
We investigate the incremental relaying protocol in conjunction with relay-selection cooperative diversity networks with an aim to make efficient use of the degrees of freedom of the channels by exploiting a limited feedback signal from the destination. In particular, whenever the direct link from the source to the destination is not favorable to decoding, the destination will request the help from...
In this paper, we investigate amplify-and-forward (AF) incremental-best-relay cooperative diversity to make efficient use of the channel spectrum by exploiting a limited feedback from the destination terminal, e.g., a single bit indicating the success or failure of the direct transmission. If the destination provides a negative acknowledgment via feedback; in this case only, the best relay among M...
We consider an amplify-and-forward (AF) cooperative-diversity system where a source node communicates with a destination node directly and indirectly (through multiple relays), in this paper, we analyze the system where N multiple relays that have the strongest signal strength at the destination are selected out of M relays and forward their received data from the source node to the destination node...
In this paper, the performances analysis of cooperative-diversity networks using adaptive decode-and-forward (DF) relaying over independent non-identical flat Nakagami-m fading channels is investigated. We derive closed-form expressions for the error probability, outage probability and average channel capacity, and analyze their dependence on the channel parameters. In adaptive DF relaying, among...
Cooperative-diversity networks have been proposed as a way to form virtual antenna arrays without using collocated multiple antennas. In this paper, we consider the amplify-and-forward cooperative-diversity system with the Nth best-relay selection scheme. In the best-relay selection scheme, the best relay only forwards the source signal to the destination. However, the best relay might be unavailable;...
Power consumption, latency, and complexity are considered to be a benchmark for comparing Medium Access Control (MAC) protocols in Wireless Sensor Networks (WSN). However, the importance of these elements varies according to the application. In this paper, three MAC protocols are proposed for forest fire detection. Basically, two of these protocols are based on the Carrier Sense Multiple Access with...
In this paper, we present closed form expressions for tight lower bounds of the performance of dual-hop non- regenerative relaying over independent non-identical Weibull fading channels. Since it is hard to find a closed form expression for the probability density function (PDF) of the signal-to-noise ratio (SNR) for the Weibull fading distribution, we use an approximate value instead. Novel closed...
Cooperative-diversity networks have recently been proposed as a way to form virtual antenna arrays without using collocated multiple antennas. Cooperative-diversity networks use the neighbor nodes to assist the source by sending the source information to the destination for achieving spatial diversity. Regular cooperative-diversity networks make an inefficient use of the channel resources because...
Cooperative diversity is a promising technology for future wireless networks. In this paper, we derive the average bit error rate (BER) and outage probability (Pout) for differential equal gain combining (EGC) in cooperative diversity networks. The considered network uses adaptive decode-and-forward (DF) relaying over independent non-identical Nakagami-m fading channels. In adaptive DF relaying among...
Dispersion and nonlinear wave impairment upon transition over single channel optical fiber are reviewed. Since chromatic dispersion can be predicted, transmit techniques are developed to contain its effects on digital signal transition. Advancements in these techniques are given high-lighting dispersion resilience versus electronic predistortion. The latter can also handle self phase modulation due...
This paper analyzes the throughput performance of cooperative diversity wireless networks using adaptive modulation over Rayleigh fading channels. Cooperative diversity is achieved by utilizing neighbouring terminals as relays. These relays can generate copies of the same signal, which can provide spatial diversity gain and signal-to-noise ratio (SNR). The main drawback of cooperative diversity is...
This paper studies the end-to-end performance of cooperative diversity networks equipped with amplify-and-forward (non-regenerative) relays and a selection combining receiver over independent non-identical Rayleigh fading channels. Closed-form expressions for the cumulative distribution function (CDF), the probability density function (PDF) and the moment generating function (MGF) of the end-to-end...
Cooperative diversity networks have recently been proposed as a way to form virtual antenna arrays without using collocated multiple antennas. Cooperative diversity networks use the neighbor nodes to assist the source by sending the source information to the destination for achieving spatial diversity. Regular cooperative diversity networks make an inefficient use of the channel resources because...
The introduction of Multiple-Input Multiple-Output (MIMO) opened the door for space-time processing (STP) techniques to improve the transmission reliably and spectral efficiency. STP algorithms have been mainly proposed to achieve either enhancement in the link quality (through spatial diversity) or throughput gain (through spatial multiplexing). The simultaneous enhancement of link reliability and...
This research aims at to assess the impact of natural hazards on the human activities and development planning held along the eastern coastal stretch of the Gulf of Suez. Change detection technique was used in combined with geologic and topographic maps, GIS and field investigations to specify and categorize environmental hazards along the concerned area. This site is characterized by enormous natural...
Cooperative diversity is a promising technology for future wireless networks. In this paper, based on the moment generating function (MGF), we derive exact closed-form expressions for the average bit error rate (BER), the amount of fading (AF), and outage probability (Pout) for cooperative diversity networks with amplify-and-forward relaying over Rayleigh-fading channel using differentially- non-coherent...
Call admission control (CAC) is essential to guarantee the signal quality in CDMA systems. Signal-to-interference-and-noise ratio (SINR) is used as a criterion for user admission by comparing the SINR with a predefined threshold value (SINRth). The choice of the SINRth value is restricted by two opposing factors: the signal quality and the network utilization. Setting SINRth at high value is desirable...
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