Electrical Engineering: Recent submissions
Now showing items 1401-1420 of 2821
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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 ... -
A diversity compression and combining technique based on channel shortening for cooperative networks
( IEEE , 2012 , Article)The cooperative relaying process with multiple relays needs proper coordination among the communicating and the relaying nodes. This coordination and the required capabilities may not be available in some wireless systems ... -
Advanced experimental setup for the reliability characterization of radio-acoustic sensors in water pipes
( IEEE , 2011 , Conference)The paper presents the design and construction of a test bench for the analysis and certification of radio-acoustic sensors inside conduits filled with liquids. It is a brand new test-set that integrates the capability to ... -
Joint optimal threshold-based relaying and ML detection in cooperative networks
( IEEE , 2012 , Article)This paper proposes two detection schemes for cooperative networks comprising a source, a relay and a destination. The relay is assumed to operate in a half-duplex mode and it employs decode-and-forward (DF) relaying. The ... -
Analysis of cell spectral efficiency of infrastructure relay-enhanced cellular system
( IEEE , 2011 , Conference)In this paper, we investigate the downlink spectral efficiency of infrastructure relay-enhanced cellular systems. In particular, we use the average achieved spectral efficiency at an arbitrary mobile receiver in presence ... -
Performances analysis of SEC based transmit diversity systems with MRC receivers
( IEEE , 2012 , Conference)Switch and Examine combining (SEC) diversity scheme is one of the simplest yet efficient diversity schemes. Earlier in [1] and [2], we proposed sequential power loading algorithm to reduce the average power used at the ... -
Two way opportunistic MAC protocol for Ad Hoc networks
( IEEE , 2011 , Conference)In this paper, network coding is introduced in relay based MAC protocols for bidirectional traffic to evaluate the performance in terms of throughput and energy. The idea of proposed scheme is to use high data rate nodes ... -
Exposure assessment to WiFi access points by simulations and measurements
( IEEE , 2011 , Conference)This paper discusses two different approaches to assess exposure to indoor WiFi access points at two different frequency bands: 2.4GHz and 5GHz. The first analyzes the electromagnetic propagation in almost empty environments ...