Electrical Engineering: Recent submissions
Now showing items 1421-1440 of 2849
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Cooperative communications scheme with interference management under ICI for OFDM LTE-A systems
( IEEE Computer Society , 2013 , Conference)In long term evolution (LTE) systems, the achievable cell spectral efficiency is often limited by the inter carrier interference (ICI) or coverage shortage of base stations. Hence, in LTE-Advanced, cooperative communication ... -
On hierarchical network coding versus opportunistic user selection for two-way relay channels with asymmetric data rates
( IEEE , 2013 , Article)We address in this paper the challenge of coping with asymmetric data rates in two-way relay channels. We consider a relay network comprising two sources and one relay. The sources communicate at different rates through ... -
Prior zero forcing for cognitive relaying
( IEEE , 2013 , Article)Relaying primary signals by cognitive base-stations (CBSs) can help the primary system and thus win CBSs a higher chance to transmit their own signals. For this purpose, conventional zero-forcing (CZF) beamforming is a ... -
Performance analysis of selective cooperation in amplify-and-forward relay networks over identical Nakagami-m channels
( Wiley Online Library , 2013 , Article)In cooperative communications, multiple relays between a source and a destination can increase the diversity gain. Because all the nodes must use orthogonal channels, multiple-relay cooperation becomes spectrally inefficient. ... -
Performance analysis of relay selection schemes in underlay cognitive networks with imperfect channel state information
( IEEE Computer Society , 2013 , Conference)Cognitive Radio (CR) aims to improve spectrum utilization by allowing unlicensed users to access the licensed spectrum and to coexist with primary user (PU) while respecting the PU's restrictions. An interesting case to ... -
Area spectral efficiency of underlay cognitive radio transmission over rayleigh fading channels
( IEEE , 2013 , Conference)Cognitive radio is a promising technology to improve the spectrum utilization by allowing the unlicensed (secondary) user share a frequency bandwidth with the licensed (primary) owner under the condition that no harmful ... -
Interference management schemes with general order statistics and interference constraint for multi-user cooperative wireless networks
( Institute of Electrical and Electronics Engineers Inc. , 2013 , Conference)In this paper, two cooperative communications schemes with interference management are proposed for multiuser wireless networks. The first scheme (Interference Constraint based Relay Selection (ICRS)) maximizes the received ... -
Priority-based zero-forcing in spectrum sharing cognitive systems
( IEEE , 2013 , Article)We consider a spectrum sharing scenario between cognitive radio (CR) users and a licensed primary user (PU), in which the PU is not able to successfully transmit data to its destined receiver. The cognitive base station ... -
Life is engineering program: Impact of an engineering outreach project in K-12
( IEEE , 2013 , Conference)The demand for qualified national engineers is high in Qatar; Currently, a wide gap in supply exists. Consequently, urgent and proactive interventions at K-12 level to promote engineering profession to school students are ... -
Outage analysis of selective cooperation in underlay cognitive networks with fixed gain relays and primary interference modeling
( IEEE , 2012 , Conference)Selective cooperation is a well investigated technique in non-cognitive networks for efficient spectrum utilization and performance improvement. However, it is still a nascent topic for underlay cognitive networks. Recently, ... -
Performance analysis of relay selection schemes in underlay cognitive networks with Decode and Forward relaying
( IEEE , 2012 , Conference)In underlay cognitive networks with regenerative relaying, secondary users operating with primary user are adhering to stringent interference constraint which limits their transmission power and coverage area. In order not ... -
Enhancing wireless networks performance through cooperative communications with interference management
( IEEE , 2012 , Conference)Cooperative radio communication has been proposed as an efficient technique to extend coverage and improve throughput in future wireless networks. However, its performance gain is degraded in the presence of co-channel ... -
Novel cooperative communication schemes with interference management for multi-user wireless networks
( Institute of Electrical and Electronics Engineers Inc. , 2013 , Conference)Cooperative communication is a promising technique for future wireless networks. It can be used in improving communication reliability, and enhancing power and spectrum efficiency. However, its performance gain degrades ... -
Reactive relay selection in underlay cognitive networks with fixed gain relays
( IEEE , 2012 , Conference)Best relay selection is a bandwidth efficient technique for multiple relay environments without compromising the system performance. The problem of relay selection is more challenging in underlay cognitive networks due to ... -
Area spectral efficiency of cooperative network with DF and AF relaying
( IEEE , 2012 , Conference)Most performance metrics for cooperative networks focus on the qualification of either spectrum efficiency or link reliability, without considering the spatial effect of radio transmission. Area spectral efficiency (ASE) ... -
Optimized Selective OFDMA in multihop network
( IEEE , 2012 , Conference)Selective OFDMA is a powerfull relaying technique with subcarrier based selection. This scheeme has a high potential to considerably improve the performance of cooperative OFDM systems. However, in practice, the implementation ... -
Performance of two way opportunistic MAC protocol in non-saturated ad hoc networks
( IEEE , 2012 , Conference)In this paper, performance of relay based MAC protocol for two way traffic is evaluated in non-saturated condition. In real life, non-saturation is more prevalent where nodes are mostly idle. The idea of Two Way ... -
Outage performance of OFDM Ad-hoc routing with and without subcarrier grouping in multihop network
( IEEE , 2012 , Conference)In this contribution, we investigate Decode and Forward (DF) OFDM Ad-hoc Routing strategy with bottleneck maximization. We derive the exact outage probability and diversity order for the different scenarios: with and without ... -
Joint optimal threshold-based relaying and ml detection in network-coded two-way relay channels
( Institute of Electrical and Electronics Engineers Inc. , 2012 , Article)In this paper, we address the problem of joint optimal threshold-based relaying and maximum likelihood (ML) detection in network-coded cooperative systems. The purpose of using threshold-based relaying is to circumvent the ... -
Performance analysis of relay assignment schemes for cooperative networks with multiple source-destination pairs
( IEEE , 2012 , Article)In this paper, we consider two relay assignment schemes for cooperative networks comprising multiple source-destination pairs. Both schemes are based on the max-min criterion and aim at achieving the maximum spatial diversity ...