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University of Leeds
(25 results)-
White Papers
An Integrated Intrusion Detection and Diagnosis for Clouds
April 27, 2009, 12:00am PDT
Improving dependability of Cloud computing is critical to the realization of its potential as a technology to facilitate the development of large-scale, flexible computing infrastructures,...
Provided by University of Leeds
-
White Papers
Towards Quality of Service in the Cloud
June 10, 2009, 12:00am PDT
Quality of Service (QoS) plays a critical role in the affective reservation of resources within service oriented distributed systems and has been widely investigated in the now well established...
Provided by University of Leeds
-
White Papers
The Coexistence of 802.11b/g and Bluetooth: An Experimental Comparison in LoS Conditions
April 3, 2009, 12:00am PDT
This paper presents experimental results for TCP throughput performance of the IEEE 802.11b/g standard in the presence of Bluetooth (BT) interference. The throughput of an IEEE 802.11b/g network...
Provided by University of Leeds
-
White Papers
System Design and Networking Protocols for Wireless Positioning
July 4, 2007, 12:00am PDT
The recent boom in wireless communications has led to a wide range of new applications. Wireless positioning is an emerging technology which can provide accurate locations for indoor environments...
Provided by University of Leeds
-
White Papers
Using the Cognitive Walkthrough to Improve the Design of a Visual Programming Experiment
January 1, 2011, 12:00am PST
Visual programming languages aim to promote usability, but are rarely examined for it. One reason is the difficulty of designing successful experimental evaluations. The authors propose the...
Provided by University of Leeds
-
White Papers
Block Coded Modulation and Non-Coherent Detection For Impulse Radio UWB
September 14, 2007, 12:00am PDT
Noncoherent receivers are favored for UWB-IR systems because of their low implementation complexity compared with coherent correlation receivers. However, existing noncoherent schemes, such as...
Provided by University of Leeds
-
White Papers
Multipath Diversity and Coding Gains of Cyclic-Prefixed Single Carrier Systems
January 22, 2009, 12:00am PST
The multipath diversity and coding gain metrics for Cyclic-Prefixed Single-Carrier (SC-CP) systems, which characterize the Bit Error Rate (BER) at high SNR, have not been carefully studied in the...
Provided by University of Leeds
-
White Papers
Full-Rank and Rank-Deficient Precoding Schemes for Single-Carrier Block Transmissions
April 16, 2009, 12:00am PDT
In block-mode transmission, inserting a Cyclic Prefix (CP) between two consecutive blocks provides an efficient way of removing inter-block interference and simplifies equalization of...
Provided by University of Leeds
-
White Papers
Timing and Frequency Synchronization for OFDM Based Cooperative Systems
December 19, 2008, 12:00am PST
In this paper, the authors investigate the timing and Carrier Frequency Offset (CFO) synchronization problem in decode and forward cooperative systems operating over frequency selective channels....
Provided by University of Leeds
-
White Papers
Transmit Beamforming for MISO Frequency-Selective Channels With Total and Per-Antenna Power Constraints
December 15, 2009, 12:00am PST
The authors consider the problem of transmit BeamForming (BF) design for Cyclic Prefixed (CP) transmissions over MISO frequency selective channels. Both CP single carriers (SC) and Orthogonal...
Provided by University of Leeds
-
White Papers
Data Detection in Cooperative STBC-OFDM Systems With Multiple Frequency Offsets
February 13, 2009, 12:00am PST
This paper addresses the problem of data detection in cooperative Space-Time Block Coded (STBC) Orthogonal Frequency Division Multiplexing (OFDM) systems in the presence of multiple Carrier...
Provided by University of Leeds
-
White Papers
Locally Optimum Detection for Spectrum Sensing in Cognitive Radio
May 10, 2009, 12:00am PDT
Spectrum sensing is a key feature in cognitive radio networks. The authors propose a Locally Optimum (LO) detector, which is known to be optimum at low SNR. This is desirable in cognitive radio...
Provided by University of Leeds
-
White Papers
Wireless Networks With Retransmission Diversity and Carrier-Sense Multiple Access
June 27, 2009, 12:00am PDT
Network Diversity Multiple Access protocols (NDMA) have been shown to considerably outperform previously proposed algorithms. However, several issues in their analysis remain unsolved,...
Provided by University of Leeds
-
White Papers
Semi-Blind Locally Optimum Detection for Spectrum Sensing in Cognitive Radio
September 15, 2009, 12:00am PDT
Spectrum sensing in cognitive radio becomes a challenging task when the signals received at the secondary users' transmitters exhibit low power. Locally Optimum Detectors (LOD) are therefore...
Provided by University of Leeds
-
White Papers
Extension of GPS Broadcast Ephemeris to Determine Satellite Velocity and Acceleration
April 9, 2009, 12:00am PDT
This paper presents an expansion of the algorithm provided in the GPS ICD to include the precise real-time computation in ECEF coordinate of the velocity and acceleration components of the...
Provided by University of Leeds
-
White Papers
A Generalized Geometry-Inclusive Fading Model for Adhoc Wireless Networks
April 23, 2009, 12:00am PDT
A new generic statistical fading model for wireless adhoc networks is proposed. Besides small scale fading, the authors' proposed model incorporates the variations due to geometry, i.e....
Provided by University of Leeds
-
White Papers
Outage Probability Analysis of Cognitive Radio Networks Under Self-Coexistence Constraint
February 25, 2010, 12:00am PST
Cognitive Radio Networks (CRNs) are envisioned to eradicate the artificial scarcity caused by today's stringent spectrum allocation policy. In this paper, the authors develop a statistical...
Provided by University of Leeds
-
White Papers
Training Design for CFO Estimation in OFDM Over Correlated Multipath Fading Channels
August 1, 2007, 12:00am PDT
Carrier Frequency Offset (CFO) estimation is a key challenge in multicarrier systems such as OFDM. Often, this task is carried out using a preamble made of a number, say J, of Repetitive-Slots...
Provided by University of Leeds
-
White Papers
Spatial Multiplexing in the Multi-User MIMO Downlink Based on Signal-to-Leakage Ratios
October 17, 2007, 12:00am PDT
Spatial multiplexing in the Multi-User MIMO (MUMIMO) downlink allows each user in the system to receive multiple data subchannels simultaneously using the same time and spectral resources. In this...
Provided by University of Leeds
-
White Papers
Code-Assisted Synchronization for UWB-IR Systems: Algorithms and Analysis
May 18, 2008, 12:00am PDT
Timing synchronization is a critical challenge in Ultra-WideBand Impulse Radios (UWB-IRs). Conventional full digital synchronization methods encounter implementation difficulties such as high rate...
Provided by University of Leeds
-
White Papers
Energy-Efficiency in Cloud Computing Environments: Towards Energy Savings Without Performance Degradation
June 9, 2011, 12:00am PDT
Due to all the pollutants generated by it and the steady increases in its rates, energy consumption is causing serious environmental and economic problems. In this paper, the growing use and...
Provided by University of Leeds
-
White Papers
OPTIMIS: A Holistic Approach to Cloud Service Provisioning
August 18, 2010, 12:00am PDT
The authors present the fundamentals for a toolkit for scalable and dependable service platforms and architectures that enable flexible and dynamic provisioning of cloud services. The innovations...
Provided by University of Leeds
-
White Papers
Applications of QKD Network for High Performance Distributed Computing
September 16, 2008, 12:00am PDT
Quantum Key Distribution (QKD) is a point to point secure key generation technology which provides unconditional security. To exploit the security of QKD for large scale practical communication,...
Provided by University of Leeds
-
White Papers
Adaptive Modulation for LDPC Coded-OFDM Based Powerline Communication System
September 21, 2011, 12:00am PDT
As a result of the impairments generated by the consumer electronic devices on power line channel extensive research has been carried out to mitigate the deteriorating effects. In this paper, the...
Provided by University of Leeds
-
White Papers
Quantum Cryptography With Generalized Bases and Dimensions of Photon States
January 1, 2012, 12:00am PST
Quantum Key Distribution (QKD) is a secure key sharing technology with unconditional security. Certain well-known protocols for QKD have been presented, which claim their security by means of...
Provided by University of Leeds
-
White Papers
Quantum Cryptography With Generalized Bases and Dimensions of Photon States
January 1, 2012, 12:00am PST
Quantum Key Distribution (QKD) is a secure key sharing technology with unconditional security. Certain well-known protocols for QKD have been presented, which claim their security by means of...
Provided by University of Leeds
-
White Papers
Adaptive Modulation for LDPC Coded-OFDM Based Powerline Communication System
September 21, 2011, 12:00am PDT
As a result of the impairments generated by the consumer electronic devices on power line channel extensive research has been carried out to mitigate the deteriorating effects. In this paper, the...
Provided by University of Leeds
-
White Papers
OPTIMIS: A Holistic Approach to Cloud Service Provisioning
August 18, 2010, 12:00am PDT
The authors present the fundamentals for a toolkit for scalable and dependable service platforms and architectures that enable flexible and dynamic provisioning of cloud services. The innovations...
Provided by University of Leeds
-
White Papers
An Integrated Intrusion Detection and Diagnosis for Clouds
April 27, 2009, 12:00am PDT
Improving dependability of Cloud computing is critical to the realization of its potential as a technology to facilitate the development of large-scale, flexible computing infrastructures,...
Provided by University of Leeds
-
White Papers
Energy-Efficiency in Cloud Computing Environments: Towards Energy Savings Without Performance Degradation
June 9, 2011, 12:00am PDT
Due to all the pollutants generated by it and the steady increases in its rates, energy consumption is causing serious environmental and economic problems. In this paper, the growing use and...
Provided by University of Leeds
-
White Papers
Code-Assisted Synchronization for UWB-IR Systems: Algorithms and Analysis
May 18, 2008, 12:00am PDT
Timing synchronization is a critical challenge in Ultra-WideBand Impulse Radios (UWB-IRs). Conventional full digital synchronization methods encounter implementation difficulties such as high rate...
Provided by University of Leeds
-
White Papers
Spatial Multiplexing in the Multi-User MIMO Downlink Based on Signal-to-Leakage Ratios
October 17, 2007, 12:00am PDT
Spatial multiplexing in the Multi-User MIMO (MUMIMO) downlink allows each user in the system to receive multiple data subchannels simultaneously using the same time and spectral resources. In this...
Provided by University of Leeds
-
White Papers
Training Design for CFO Estimation in OFDM Over Correlated Multipath Fading Channels
August 1, 2007, 12:00am PDT
Carrier Frequency Offset (CFO) estimation is a key challenge in multicarrier systems such as OFDM. Often, this task is carried out using a preamble made of a number, say J, of Repetitive-Slots...
Provided by University of Leeds
-
White Papers
Outage Probability Analysis of Cognitive Radio Networks Under Self-Coexistence Constraint
February 25, 2010, 12:00am PST
Cognitive Radio Networks (CRNs) are envisioned to eradicate the artificial scarcity caused by today's stringent spectrum allocation policy. In this paper, the authors develop a statistical...
Provided by University of Leeds
-
White Papers
A Generalized Geometry-Inclusive Fading Model for Adhoc Wireless Networks
April 23, 2009, 12:00am PDT
A new generic statistical fading model for wireless adhoc networks is proposed. Besides small scale fading, the authors' proposed model incorporates the variations due to geometry, i.e....
Provided by University of Leeds
-
White Papers
Extension of GPS Broadcast Ephemeris to Determine Satellite Velocity and Acceleration
April 9, 2009, 12:00am PDT
This paper presents an expansion of the algorithm provided in the GPS ICD to include the precise real-time computation in ECEF coordinate of the velocity and acceleration components of the...
Provided by University of Leeds
-
White Papers
Semi-Blind Locally Optimum Detection for Spectrum Sensing in Cognitive Radio
September 15, 2009, 12:00am PDT
Spectrum sensing in cognitive radio becomes a challenging task when the signals received at the secondary users' transmitters exhibit low power. Locally Optimum Detectors (LOD) are therefore...
Provided by University of Leeds
-
White Papers
Wireless Networks With Retransmission Diversity and Carrier-Sense Multiple Access
June 27, 2009, 12:00am PDT
Network Diversity Multiple Access protocols (NDMA) have been shown to considerably outperform previously proposed algorithms. However, several issues in their analysis remain unsolved,...
Provided by University of Leeds
-
White Papers
Locally Optimum Detection for Spectrum Sensing in Cognitive Radio
May 10, 2009, 12:00am PDT
Spectrum sensing is a key feature in cognitive radio networks. The authors propose a Locally Optimum (LO) detector, which is known to be optimum at low SNR. This is desirable in cognitive radio...
Provided by University of Leeds
-
White Papers
Data Detection in Cooperative STBC-OFDM Systems With Multiple Frequency Offsets
February 13, 2009, 12:00am PST
This paper addresses the problem of data detection in cooperative Space-Time Block Coded (STBC) Orthogonal Frequency Division Multiplexing (OFDM) systems in the presence of multiple Carrier...
Provided by University of Leeds
-
White Papers
Transmit Beamforming for MISO Frequency-Selective Channels With Total and Per-Antenna Power Constraints
December 15, 2009, 12:00am PST
The authors consider the problem of transmit BeamForming (BF) design for Cyclic Prefixed (CP) transmissions over MISO frequency selective channels. Both CP single carriers (SC) and Orthogonal...
Provided by University of Leeds
-
White Papers
Timing and Frequency Synchronization for OFDM Based Cooperative Systems
December 19, 2008, 12:00am PST
In this paper, the authors investigate the timing and Carrier Frequency Offset (CFO) synchronization problem in decode and forward cooperative systems operating over frequency selective channels....
Provided by University of Leeds
-
White Papers
Full-Rank and Rank-Deficient Precoding Schemes for Single-Carrier Block Transmissions
April 16, 2009, 12:00am PDT
In block-mode transmission, inserting a Cyclic Prefix (CP) between two consecutive blocks provides an efficient way of removing inter-block interference and simplifies equalization of...
Provided by University of Leeds
-
White Papers
Multipath Diversity and Coding Gains of Cyclic-Prefixed Single Carrier Systems
January 22, 2009, 12:00am PST
The multipath diversity and coding gain metrics for Cyclic-Prefixed Single-Carrier (SC-CP) systems, which characterize the Bit Error Rate (BER) at high SNR, have not been carefully studied in the...
Provided by University of Leeds
-
White Papers
Block Coded Modulation and Non-Coherent Detection For Impulse Radio UWB
September 14, 2007, 12:00am PDT
Noncoherent receivers are favored for UWB-IR systems because of their low implementation complexity compared with coherent correlation receivers. However, existing noncoherent schemes, such as...
Provided by University of Leeds
-
White Papers
Using the Cognitive Walkthrough to Improve the Design of a Visual Programming Experiment
January 1, 2011, 12:00am PST
Visual programming languages aim to promote usability, but are rarely examined for it. One reason is the difficulty of designing successful experimental evaluations. The authors propose the...
Provided by University of Leeds
-
White Papers
System Design and Networking Protocols for Wireless Positioning
July 4, 2007, 12:00am PDT
The recent boom in wireless communications has led to a wide range of new applications. Wireless positioning is an emerging technology which can provide accurate locations for indoor environments...
Provided by University of Leeds
-
White Papers
The Coexistence of 802.11b/g and Bluetooth: An Experimental Comparison in LoS Conditions
April 3, 2009, 12:00am PDT
This paper presents experimental results for TCP throughput performance of the IEEE 802.11b/g standard in the presence of Bluetooth (BT) interference. The throughput of an IEEE 802.11b/g network...
Provided by University of Leeds
-
White Papers
Towards Quality of Service in the Cloud
June 10, 2009, 12:00am PDT
Quality of Service (QoS) plays a critical role in the affective reservation of resources within service oriented distributed systems and has been widely investigated in the now well established...
Provided by University of Leeds
-
White Papers
Applications of QKD Network for High Performance Distributed Computing
September 16, 2008, 12:00am PDT
Quantum Key Distribution (QKD) is a point to point secure key generation technology which provides unconditional security. To exploit the security of QKD for large scale practical communication,...
Provided by University of Leeds
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