Khartoum International Community School

Displaying 1-16 of 16 results

  • White Papers // Dec 2011

    EMCCA: An Enhanced Mesh Coordinated Channel Access Mechanism for IEEE 802.11s Wireless Mesh Networks

    In this paper, the authors present a channel access mechanism, referred to as the enhanced Mesh Coordinated Channel Access (eMCCA) mechanism, for IEEE 802.11s-based wireless mesh networks. The current draft of IEEE 802.11s includes an optional Medium Access Control (MAC), denoted as MCCA, which is designed to provide collision-free and...

    Provided By Khartoum International Community School

  • White Papers // Oct 2011

    Cooperative MAC Protocol Using Active Relays for Multi-Rate WLANs

    Cooperative communications using relays in wireless networks have similar effects of multiple-input and multiple-output without the need of multiple antennas at each node. To implement cooperation into a system, efficient protocols are desired. In IEEE 802.11 families such as a/b/g, mobile stations can automatically adjust transmission rates according to channel...

    Provided By Khartoum International Community School

  • White Papers // Aug 2011

    Beamforming Optimization for Multiuser Two-Tier Networks

    With the incitation to reduce power consumption and the aggressive reuse of spectral resources, there is an inevitable trend towards the deployment of small-cell networks by decomposing a traditional single-tier network into a multi-tier network with very high throughput per network area. However, this cell size reduction increases the complexity...

    Provided By Khartoum International Community School

  • White Papers // Apr 2011

    Access Right Assignment Mechanisms for Secure Home Networks

    The proliferation of advanced technologies has been altering the peoples lifestyle and social interactions - the next frontier is the digital home. Although the future of smart homes is promising, many technical challenges must be addressed to achieve convenience and security. In this paper, the authors delineate the unique combination...

    Provided By Khartoum International Community School

  • White Papers // Apr 2011

    Efficient Interference Cancellation Scheme for Wireless Body Area Network

    In this paper, the authors propose and simulate an efficient interference cancellation scheme with an optimal ordering Successive Interference Cancellation (SIC) algorithm for Ultra WideBand (UWB)/Multiple-Input-Multiple-Output (MIMO) systems in a Wireless Body Area Network (WBAN). When there are several wireless communication devices on a human body, Multiple Access Interference (MAI)...

    Provided By Khartoum International Community School

  • White Papers // Apr 2011

    PEC: A Privacy-Preserving Emergency Call Scheme for Mobile Healthcare Social Networks

    In this paper, the authors propose a privacy-preserving emergency call scheme, called PEC, enabling patients in life-threatening emergencies to fast and accurately transmit emergency data to the nearby helpers via Mobile Healthcare Social Networks (MHSNs). Once an emergency happens, the Personal Digital Assistant (PDA) of the patient runs the PEC...

    Provided By Khartoum International Community School

  • White Papers // Jan 2011

    Improving TCP Performance With Bandwidth Estimation and Selective Negative Acknowledgment in Wireless Networks

    This paper investigates the performance of the Transmission Control Protocol (TCP) transport protocol over IEEE 802.11 infrastructure based wireless networks. A wireless link is generally characterized by high transmission errors, random interference and a varying latency. The erratic packet losses usually lead to a curbing of the flow of segments...

    Provided By Khartoum International Community School

  • White Papers // Mar 2010

    On the Trade-Off Between Throughput Maximization and Energy Consumption Minimization in IEEE 802.11 WLANs

    Understanding and optimizing the energy consumption of wireless devices is critical to maximize the network lifetime and to provide guidelines for the design of new protocols and interfaces. In this paper, the authors first provide an accurate analysis of the energy performance of an IEEE 802.11 WLAN, and then they...

    Provided By Khartoum International Community School

  • White Papers // Feb 2010

    On the Diversity-Multiplexing Tradeoff of Cooperative Multicast System With Wireless Network Coding

    Diversity-Multiplexing Tradeoff (DMT) is an efficient tool to measure the performance of Multiple-Input and Multiple-Output (MIMO) systems and cooperative systems. Recently, cooperative multicast system with wireless network coding stretched tremendous interesting due to that it can drastically enhance the throughput of the wireless networks. It is desirable to apply DMT...

    Provided By Khartoum International Community School

  • White Papers // Feb 2010

    Proportional Fair Scheduling Algorithm in OFDMA-Based Wireless Systems With QoS Constraints

    In this paper, the authors consider the problem of downlink resource allocation for proportional fairness of long term received rates of data users and quality of service for real time sessions in an OFDMA-based wireless system. The base station allocates available power and subchannels to individual users based on long...

    Provided By Khartoum International Community School

  • White Papers // Dec 2009

    An Energy-Efficient Access Control Scheme For Wireless Sensor Networks Based on Elliptic Curve Cryptography

    For many mission-critical related wireless sensor network applications such as military and homeland security, user's access restriction is necessary to be enforced by access control mechanisms for different access rights. Public key-based access control schemes are more attractive than symmetric-key based approaches due to high scalability, low memory requirement, easy...

    Provided By Khartoum International Community School

  • White Papers // Oct 2009

    An Efficient On-Demand Routing Approach With Directional Flooding for Wireless Mesh Networks

    Current on-demand ad-hoc routing protocols are not appropriate for Wireless Mesh Networks (WMNs), because flooding-based route discovery is both redundant and expensive in terms of control message overhead. In this paper, the authors propose an efficient on-demand routing approach with Directional Flooding (DF), which is suitable for the WMNs with...

    Provided By Khartoum International Community School

  • White Papers // Aug 2009

    Energy-Aware QoS Provisioning for Wireless Sensor Networks: Analysis and Protocol

    Wireless Sensor Networks (WSNs) are envisioned to facilitate information gathering for various applications and depending on the application types they may require certain Quality of Service (QoS) guarantee for successful and guaranteed event perception. Therefore, QoS in WSNs is an important issue and two most important parameters that hinder the...

    Provided By Khartoum International Community School

  • White Papers // Aug 2009

    Exploiting Mobility for Efficient Data Dissemination in Wireless Sensor Networks

    In this paper, the authors introduce a novel mobility model for mobile sinks in which the sinks move towards randomly distributed destinations, where each destination is associated with a mission. The novel mobility model is termed the random mobility with destinations. There have been many studies on mobile sinks; however,...

    Provided By Khartoum International Community School

  • White Papers // Apr 2009

    Large-Scale Joint Rate and Power Allocation Algorithm Combined with Admission Control in Cognitive Radio Networks

    Orthogonal Frequency Division Multiple Access (OFDMA) is a promising modulation and access scheme for the proposed future wireless network standard like 4G cellular networks. For the network based on OFDMA, due to the large capacity that can be provided by OFDMA, it could be possible that the system is under-utilized...

    Provided By Khartoum International Community School

  • White Papers // Apr 2009

    RawPEACH: Multiband CSMA/CA-Based Cognitive Radio Networks

    A new Medium Access Control (MAC) scheme embedding physical channels into multiband Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) networks is proposed to provide strict Quality of Service (QoS) guarantee to high priority users. In the proposed scheme, two priority classes of users, primary and secondary users, are supported. For primary...

    Provided By Khartoum International Community School

  • White Papers // Aug 2009

    Energy-Aware QoS Provisioning for Wireless Sensor Networks: Analysis and Protocol

    Wireless Sensor Networks (WSNs) are envisioned to facilitate information gathering for various applications and depending on the application types they may require certain Quality of Service (QoS) guarantee for successful and guaranteed event perception. Therefore, QoS in WSNs is an important issue and two most important parameters that hinder the...

    Provided By Khartoum International Community School

  • White Papers // Aug 2011

    Beamforming Optimization for Multiuser Two-Tier Networks

    With the incitation to reduce power consumption and the aggressive reuse of spectral resources, there is an inevitable trend towards the deployment of small-cell networks by decomposing a traditional single-tier network into a multi-tier network with very high throughput per network area. However, this cell size reduction increases the complexity...

    Provided By Khartoum International Community School

  • White Papers // Feb 2010

    On the Diversity-Multiplexing Tradeoff of Cooperative Multicast System With Wireless Network Coding

    Diversity-Multiplexing Tradeoff (DMT) is an efficient tool to measure the performance of Multiple-Input and Multiple-Output (MIMO) systems and cooperative systems. Recently, cooperative multicast system with wireless network coding stretched tremendous interesting due to that it can drastically enhance the throughput of the wireless networks. It is desirable to apply DMT...

    Provided By Khartoum International Community School

  • White Papers // Apr 2011

    Access Right Assignment Mechanisms for Secure Home Networks

    The proliferation of advanced technologies has been altering the peoples lifestyle and social interactions - the next frontier is the digital home. Although the future of smart homes is promising, many technical challenges must be addressed to achieve convenience and security. In this paper, the authors delineate the unique combination...

    Provided By Khartoum International Community School

  • White Papers // Dec 2011

    EMCCA: An Enhanced Mesh Coordinated Channel Access Mechanism for IEEE 802.11s Wireless Mesh Networks

    In this paper, the authors present a channel access mechanism, referred to as the enhanced Mesh Coordinated Channel Access (eMCCA) mechanism, for IEEE 802.11s-based wireless mesh networks. The current draft of IEEE 802.11s includes an optional Medium Access Control (MAC), denoted as MCCA, which is designed to provide collision-free and...

    Provided By Khartoum International Community School

  • White Papers // Oct 2009

    An Efficient On-Demand Routing Approach With Directional Flooding for Wireless Mesh Networks

    Current on-demand ad-hoc routing protocols are not appropriate for Wireless Mesh Networks (WMNs), because flooding-based route discovery is both redundant and expensive in terms of control message overhead. In this paper, the authors propose an efficient on-demand routing approach with Directional Flooding (DF), which is suitable for the WMNs with...

    Provided By Khartoum International Community School

  • White Papers // Oct 2011

    Cooperative MAC Protocol Using Active Relays for Multi-Rate WLANs

    Cooperative communications using relays in wireless networks have similar effects of multiple-input and multiple-output without the need of multiple antennas at each node. To implement cooperation into a system, efficient protocols are desired. In IEEE 802.11 families such as a/b/g, mobile stations can automatically adjust transmission rates according to channel...

    Provided By Khartoum International Community School

  • White Papers // Apr 2011

    Efficient Interference Cancellation Scheme for Wireless Body Area Network

    In this paper, the authors propose and simulate an efficient interference cancellation scheme with an optimal ordering Successive Interference Cancellation (SIC) algorithm for Ultra WideBand (UWB)/Multiple-Input-Multiple-Output (MIMO) systems in a Wireless Body Area Network (WBAN). When there are several wireless communication devices on a human body, Multiple Access Interference (MAI)...

    Provided By Khartoum International Community School

  • White Papers // Apr 2009

    Large-Scale Joint Rate and Power Allocation Algorithm Combined with Admission Control in Cognitive Radio Networks

    Orthogonal Frequency Division Multiple Access (OFDMA) is a promising modulation and access scheme for the proposed future wireless network standard like 4G cellular networks. For the network based on OFDMA, due to the large capacity that can be provided by OFDMA, it could be possible that the system is under-utilized...

    Provided By Khartoum International Community School

  • White Papers // Apr 2009

    RawPEACH: Multiband CSMA/CA-Based Cognitive Radio Networks

    A new Medium Access Control (MAC) scheme embedding physical channels into multiband Carrier Sense Multiple Access/Collision Avoidance (CSMA/CA) networks is proposed to provide strict Quality of Service (QoS) guarantee to high priority users. In the proposed scheme, two priority classes of users, primary and secondary users, are supported. For primary...

    Provided By Khartoum International Community School

  • White Papers // Apr 2011

    PEC: A Privacy-Preserving Emergency Call Scheme for Mobile Healthcare Social Networks

    In this paper, the authors propose a privacy-preserving emergency call scheme, called PEC, enabling patients in life-threatening emergencies to fast and accurately transmit emergency data to the nearby helpers via Mobile Healthcare Social Networks (MHSNs). Once an emergency happens, the Personal Digital Assistant (PDA) of the patient runs the PEC...

    Provided By Khartoum International Community School

  • White Papers // Dec 2009

    An Energy-Efficient Access Control Scheme For Wireless Sensor Networks Based on Elliptic Curve Cryptography

    For many mission-critical related wireless sensor network applications such as military and homeland security, user's access restriction is necessary to be enforced by access control mechanisms for different access rights. Public key-based access control schemes are more attractive than symmetric-key based approaches due to high scalability, low memory requirement, easy...

    Provided By Khartoum International Community School

  • White Papers // Feb 2010

    Proportional Fair Scheduling Algorithm in OFDMA-Based Wireless Systems With QoS Constraints

    In this paper, the authors consider the problem of downlink resource allocation for proportional fairness of long term received rates of data users and quality of service for real time sessions in an OFDMA-based wireless system. The base station allocates available power and subchannels to individual users based on long...

    Provided By Khartoum International Community School

  • White Papers // Jan 2011

    Improving TCP Performance With Bandwidth Estimation and Selective Negative Acknowledgment in Wireless Networks

    This paper investigates the performance of the Transmission Control Protocol (TCP) transport protocol over IEEE 802.11 infrastructure based wireless networks. A wireless link is generally characterized by high transmission errors, random interference and a varying latency. The erratic packet losses usually lead to a curbing of the flow of segments...

    Provided By Khartoum International Community School

  • White Papers // Aug 2009

    Exploiting Mobility for Efficient Data Dissemination in Wireless Sensor Networks

    In this paper, the authors introduce a novel mobility model for mobile sinks in which the sinks move towards randomly distributed destinations, where each destination is associated with a mission. The novel mobility model is termed the random mobility with destinations. There have been many studies on mobile sinks; however,...

    Provided By Khartoum International Community School

  • White Papers // Mar 2010

    On the Trade-Off Between Throughput Maximization and Energy Consumption Minimization in IEEE 802.11 WLANs

    Understanding and optimizing the energy consumption of wireless devices is critical to maximize the network lifetime and to provide guidelines for the design of new protocols and interfaces. In this paper, the authors first provide an accurate analysis of the energy performance of an IEEE 802.11 WLAN, and then they...

    Provided By Khartoum International Community School