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Universitat Politecnica de Catalunya
(67 results)-
White Papers
The MIMOWA Project: A Step Towards the Real Implementation of MIMO Techniques in Future Wireless Systems
May 15, 2009, 12:00am PDT
Multiple-Input Multiple-Output (MIMO) is a radio antenna technology which employs multiple antennas at both transmitter and receiver ends, and provides new enhancements and potentials in...
Provided by Universitat Politecnica de Catalunya
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White Papers
Elastic Management of Tasks in Virtualized Environments
December 18, 2009, 12:00am PST
Nowadays, service providers in the Cloud offer complex services ready to be used as it was a commodity like water or electricity to their customers. A key technology for this approach is...
Provided by Universitat Politecnica de Catalunya
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White Papers
Towards an Efficient Service Level Agreement Assessment
January 14, 2009, 12:00am PST
On-line end-to-end Service Level Agreement (SLA) monitoring is of key importance nowadays. For this purpose, past recent researches focused on measuring (when possible) or estimating (most of the...
Provided by Universitat Politecnica de Catalunya
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White Papers
Challenges and Opportunities in Advanced Optical Networking
March 1, 2008, 12:00am PST
Optical communication systems and networks will continue to play a significant role in the development and deployment of emerging network infrastructures. These networks are expected to support...
Provided by Universitat Politecnica de Catalunya
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White Papers
The Hiring Problem: An Analytic And Experimental Study
January 18, 2010, 12:00am PST
When a small, start-up company intends to grow, it has to hire employees. Because the company requires high quality staff, the employer has to interview a lot of candidates and thus, she may take...
Provided by Universitat Politecnica de Catalunya
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White Papers
Towards Energy-Aware Scheduling in Data Centers Using Machine Learning
February 18, 2010, 12:00am PST
As energy-related costs have become a major economical factor for IT infrastructures and data-centers, companies and the research community are being challenged to find better and more efficient...
Provided by Universitat Politecnica de Catalunya
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White Papers
Design and Implementation on DSP of the ETSI GSM Adaptive Multi-Rate Vocoder
October 20, 2008, 12:00am PDT
With the current focus on high-speed packet data transmission, it is easy to forget that the primary purpose of GSM digital telecommunication systems was speech transmission. The general...
Provided by Universitat Politecnica de Catalunya
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White Papers
Adaptive XML Tree Classification on Evolving Data Streams
June 19, 2009, 12:00am PDT
This paper proposes a new method to classify patterns, using closed and maximal frequent patterns as features. Generally, classification requires a previous mapping from the patterns to classify...
Provided by Universitat Politecnica de Catalunya
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White Papers
Performance and Overhead Analysis of the ALOE Middleware for SDR
May 7, 2010, 12:00am PDT
Current Software-Defined Radio applications (Waveforms) are tailored to specific hardware. Processor vendors frequently adapt internal OS mechanisms for its specific architecture (e.g. Scheduling...
Provided by Universitat Politecnica de Catalunya
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White Papers
Insights on the Internet Routing Scalability Issues
December 9, 2009, 12:00am PST
In recent years, the size and dynamics of the global routing table have increased rapidly along with an increase in the number of edge networks. The relation between edge network quantity and...
Provided by Universitat Politecnica de Catalunya
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White Papers
OLSRp: Predicting Control Information to Achieve Scalability in OLSR Ad-Hocs Networks
July 8, 2010, 12:00am PDT
Scalability is a key design challenge that routing protocols for ad hoc networks must properly address to maintain the network performance when the number of nodes increases. This paper focusses...
Provided by Universitat Politecnica de Catalunya
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White Papers
Monitoring Adaptable SOA-Systems Using SALMon
December 25, 2008, 12:00am PST
Adaptability is a key feature of Service-Oriented Architecture (SOA) Systems. These systems must evolve themselves in order to ensure their initial requirements as well as to satisfy arising new...
Provided by Universitat Politecnica de Catalunya
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White Papers
Using UML for Modelling the Static Part of a Software Process
January 1, 2011, 12:00am PST
The authors study in this paper the use of UML as a tool for modeling the process of software construction. As a case study, they deal with the process of building a library of software...
Provided by Universitat Politecnica de Catalunya
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White Papers
Resource Usage Modeling for Network Monitoring Applications
July 10, 2007, 12:00am PDT
Building robust network monitoring applications is hard given the unpredictable nature of network traffic and high, ever-increasing data rates. Traffic analysis systems must be designed with load...
Provided by Universitat Politecnica de Catalunya
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White Papers
Revocable Attribute-Based Signatures With Adaptive Security in the Standard Model
January 27, 2011, 12:00am PST
An attribute-based signature with respect to a signing policy, chosen ad-hoc by the signer, convinces the verifier that the signer holds a subset of attributes satisfying that signing policy....
Provided by Universitat Politecnica de Catalunya
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White Papers
Analysis of Bandwidth Measurement Methodologies Over WLAN Systems
February 3, 2009, 12:00am PST
WLAN devices have become a fundamental component of nowadays network deployments. However, even though traditional networking applications run mostly unchanged over wireless links, the actual...
Provided by Universitat Politecnica de Catalunya
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White Papers
Ideal Multipartite Secret Sharing Schemes
March 16, 2010, 12:00am PDT
Multipartite secret sharing schemes are those having a multipartite access structure, in which the set of participants is divided into several parts and all participants in the same part play an...
Provided by Universitat Politecnica de Catalunya
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White Papers
On Secret Sharing Schemes, Matroids and Polymatroids
June 22, 2009, 12:00am PDT
The complexity of a secret sharing scheme is defined as the ratio between the maximum length of the shares and the length of the secret. The optimization of this parameter for general access...
Provided by Universitat Politecnica de Catalunya
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White Papers
Structured-Content Extraction From the Web for Bibliographic Reference Generation
January 3, 2011, 12:00am PST
In this paper the authors present a system that automatically creates bibliographic indexes from a collection of PDF files by using the file contents to search the Web and later extract the...
Provided by Universitat Politecnica de Catalunya
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White Papers
Performance Analysis of a Lightweight NEMO Implementation for Low-End Devices
February 15, 2008, 12:00am PST
ETF NEtwork MObility (NEMO) basic support protocol is an IP mobility management protocol designed to provide seamless IP mobility to complete networks. This protocol is of crucial interest in...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
Localization Procedure for Randomly Deployed Wireless Sensor Networks
December 17, 2012, 12:00am PST
Wireless Sensor Networks (WSNs) are composed of nodes that gather metrics like temperature, pollution or pressure from events generated by external entities. Localization in WSNs is paramount,...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
Future Evolution of CSMA Protocols for the IEEE 802.11 Standard
March 15, 2013, 12:00am PDT
In this paper a candidate protocol to replace the prevalent CSMA/CA medium access control in wireless local area networks is presented. The proposed protocol can achieve higher throughput than...
Provided by Universitat Politecnica de Catalunya
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White Papers
Resource Management in Virtualized Execution Environments: New Opportunities for Application Specific Decisions
June 9, 2008, 12:00am PDT
In this paper, the authors propose a new approach to offer application-specific resource management on virtualized execution environments, such as those provided for C# or Java. The proposal is...
Provided by Universitat Politecnica de Catalunya
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White Papers
Effective Real-Time Wireless Control of an Autonomous Guided Vehicle
September 1, 2007, 12:00am PDT
Wireless communication systems used in industrial environments must guarantee that the information is sent and received within precise time-bounds. However the nature of the radio channels and the...
Provided by Universitat Politecnica de Catalunya
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White Papers
Towards a Cooperative Intrusion Detection System for Cognitive Radio Networks
February 14, 2011, 12:00am PST
Cognitive Radio Networks (CRNs) arise as a promising solution to the scarcity of spectrum. By means of cooperation and smart decisions influenced by previous knowledge, CRNs are able to detect and...
Provided by Universitat Politecnica de Catalunya
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White Papers
Reinforcement Learning for Dynamic Spectrum Management in WCDMA
November 11, 2009, 12:00am PST
Low use of licensed spectrum imposes a need for the advanced spectrum management for wise spectrum usage with the release of unneeded frequency bands for the secondary markets and opportunistic...
Provided by Universitat Politecnica de Catalunya
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White Papers
Modeling the Lion Attack in Cognitive Radio Networks
July 23, 2010, 12:00am PDT
Cognitive radio is a promising technology aiming to improve the utilization of the radio electromagnetic spectrum. A cognitive radio is a smart device which runs radio applications software to...
Provided by Universitat Politecnica de Catalunya
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White Papers
A Real-Time FPGA-Based Mobile WiMAX Transceiver Supporting Multi-Antenna Configurations
September 11, 2011, 12:00am PDT
This paper presents the design, implementation and experimental validation of a real-time FPGA-based mobile WiMAX baseband transceiver. Three different antenna configuration schemes were...
Provided by Universitat Politecnica de Catalunya
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White Papers
Positioning-Based Framework for Secondary Spectrum Usage
July 9, 2009, 12:00am PDT
In this paper, the authors introduce a framework encompassing the creation and the exploitation of secondary spectrum usage opportunities. The paper develops a complete positioning-based framework...
Provided by Universitat Politecnica de Catalunya
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White Papers
Advanced Spectrum Management for the Downlink of WCDMA Systems Using Genetic Algorithms
January 16, 2009, 12:00am PST
In this paper, the authors propose an advanced spectrum management approach for the downlink of WCDMA systems using genetic algorithms and the concept of coupling matrix, which is able to capture...
Provided by Universitat Politecnica de Catalunya
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White Papers
Simulated Annealing-Based Advanced Spectrum Management Methodology for WCDMA Systems
June 7, 2008, 12:00am PDT
In this paper, the authors propose a new Advanced Spectrum Management (ASM) methodology for WCDMA systems using simulated annealing and the concept of coupling matrix, which is able to capture...
Provided by Universitat Politecnica de Catalunya
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White Papers
On the Role of Spectrum Selection to Improve Coverage Extension Through Opportunistic Networks
September 6, 2011, 12:00am PDT
This paper discusses the role played by Opportunistic Networks (ONs) as a means to bring Future Internet services to users in different situations. After the identification of technical challenges...
Provided by Universitat Politecnica de Catalunya
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White Papers
A Framework Based on a Fittingness Factor to Enable Efficient Exploitation of Spectrum Opportunities in Cognitive Radio Networks
September 14, 2011, 12:00am PDT
In order to increase CRs (Cognitive Radios) operation efficiency, there has been an interest in increasing awareness level about spectrum utilisation. In this respect, this paper proposes a new...
Provided by Universitat Politecnica de Catalunya
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White Papers
A Novel Spectrum Selection Strategy for Matching Multi-Service Secondary Traffic to Heterogeneous Primary Spectrum Opportunities
April 28, 2011, 12:00am PDT
In order to increase spectrum utilization efficiency, CRs (Cognitive Radios) have been introduced to reuse white spaces left unused by legacy services under the strict constraint of not...
Provided by Universitat Politecnica de Catalunya
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White Papers
Strengthening Radio Environment Maps With Primary-User Statistical Patterns for Enhancing Cognitive Radio Operation
July 13, 2011, 12:00am PDT
In order to increase spectrum utilization efficiency, CRs (Cognitive Radios) have been introduced to reuse white spaces left unused by legacy services under the strict constraint of not...
Provided by Universitat Politecnica de Catalunya
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White Papers
Handoff Functions for a Distributed Queuing Collision Avoidance Medium Access Control Protocol for Wireless LANs
August 3, 2009, 12:00am PDT
The Distributed Queuing with Collision Avoidance (DQCA) Medium Access Control (MAC) protocol has been presented in the literature as a high-performance protocol for up-link traffic in WLANs....
Provided by Universitat Politecnica de Catalunya
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White Papers
Analytical Evaluation of a Medium Access Control Priority Mechanism for Wireless Ad Hoc Networks
August 5, 2009, 12:00am PDT
The authors present in this paper the analytical evaluation of a simple mechanism to reduce the average transmission delay of master stations in a network based on the Distributed Queuing MAC...
Provided by Universitat Politecnica de Catalunya
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White Papers
Energy-Delay Tradeoff Analysis in Embedded M2M Networks With Channel Coding
June 7, 2010, 12:00am PDT
Machine-To-Machine (M2M), an emerging communications paradigm, is a facilitator of data flows between machines used, e.g., in mission-critical applications. Focusing in this paper on embedded...
Provided by Universitat Politecnica de Catalunya
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White Papers
Coexistence of a Novel Medium Access Control Protocol for Wireless Ad Hoc Networks and the IEEE 802.11
February 8, 2010, 12:00am PST
The authors describe in this paper a methodology to facilitate the coexistence of the Distributed Queuing Medium Access Control (MAC) protocol for Ad hoc Networks (DQMAN) with the IEEE 802.11...
Provided by Universitat Politecnica de Catalunya
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White Papers
Multi-Radio Cooperative ARQ in Wireless Cellular Networks: A MAC Layer Perspective
April 13, 2010, 12:00am PDT
Multi-Radio Cooperative Automatic Retransmission ReQuest (MCARQ) schemes are introduced in this paper within the context of hybrid networks which combine long-range and short-range communications....
Provided by Universitat Politecnica de Catalunya
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Whitepapers
Future Evolution of CSMA Protocols for the IEEE 802.11 Standard
March 15, 2013, 12:00am PDT
In this paper a candidate protocol to replace the prevalent CSMA/CA medium access control in wireless local area networks is presented. The proposed protocol can achieve higher throughput than...
Provided by Universitat Politecnica de Catalunya
-
Whitepapers
Localization Procedure for Randomly Deployed Wireless Sensor Networks
December 17, 2012, 12:00am PST
Wireless Sensor Networks (WSNs) are composed of nodes that gather metrics like temperature, pollution or pressure from events generated by external entities. Localization in WSNs is paramount,...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
Real-Time Services in EPON
January 18, 2012, 12:00am PST
This paper proposes an improved scheduling algorithm that optimizes the allocation of the real-time services and elastic flows in EPON by spreading the real-time service periods lowering the delay...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
A Survey of Routing Protocols for Maximizing the Lifetime of Ad Hoc Wireless Networks
August 1, 2008, 12:00am PDT
This paper is to show, how to maximize the useful lifetime of ad hoc wireless networks through energy-efficient routing. Most of the studies on energy-aware routing protocols do not provide...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
On the Physical Impairments Constraint in OBS Networks
July 7, 2010, 12:00am PDT
The introduction of sub-wavelength switching is one of the main objectives of the future transparent optical mesh networks. One strong candidate is Optical Burst Switching (OBS) which improves the...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
An Integrated GMPLS/OBS Control Plane: RSVP and OSPF Extensions Proposal
February 8, 2008, 12:00am PST
The GMPLS/OBS Control Plane is a bold research topic. Optical Burst Switching (OBS) networks need to be capable to be rapidly reconfigured with the aim of achieving an efficient use of bandwidth,...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
A Particle Filtering Tracking Algorithm for GNSS Synchronization Using Laplace's Method
January 25, 2008, 12:00am PST
Multipath is one of the dominant sources of error in high-precision GNSS applications. A tracking algorithm is presented that explicitely accounts for direct signal and multipath replicas in the...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
Fuzzy-Based Spectrum Handoff in Cognitive Radio Networks
March 20, 2008, 12:00am PDT
This paper focuses on spectrum handoffs in a cognitive radio network where secondary (unlicensed) users (i.e., cognitive radios) opportunistically use frequency channels as long as the aggregate...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
Differential Feedback in MIMO Communications: Performance With Delay and Real Channel Measurements
February 18, 2009, 12:00am PST
This paper studies the performance of the authors' recently proposed differential feedback scheme for Multi-Input-Multi-Output (MIMO) communication systems using real channel measurement data. The...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
A Low Complexity Space-Frequency Multiuser Scheduling Algorithm
February 7, 2009, 12:00am PST
This paper presents a resource allocation algorithm in K-user, M-subcarrier and NT-antenna systems for on-line scheduling. To exploit temporal diversity and to reduce complexity, the ergodic sum...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
TOA Estimation in UWB: Comparison Between Time and Frequency Domain Processing
April 13, 2010, 12:00am PDT
A comparison between time and frequency domain TOA estimators compliant with the 802.15.4a Standard has been made. The time domain estimator is done in two stages. One has the goal of identify the...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
UWB Joint TOA and DOA Estimation
June 19, 2009, 12:00am PDT
This paper deals with the simultaneous estimation of Time Of Arrival (TOA) and Direction Of Arrival (DOA) in UWB systems considering multipath propagation. The estimation is performed in the...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
A Cross-Layer Scheduling Strategy for the Downlink of a MIMO-OFDMA System With Heterogeneous Traffic
September 24, 2009, 12:00am PDT
In this paper, the authors propose and investigate a cross-layer multiuser scheduling strategy for the support of heterogeneous traffic in the downlink of a MIMO-OFDMA system. It jointly considers...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
Transmit and Receive Filters for MISO FBMC Systems Subjected to Power Constraints
February 18, 2011, 12:00am PST
Build upon the OFDM/OQAM scheme this paper addresses the design of linear transmit and receive filters. Aiming at enhancing the robustness against multipath fading, two novel techniques are...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
Resource Allocation in Multi-Antenna MAC Networks: FBMC Vs OFDM
June 26, 2011, 12:00am PDT
This paper addresses the problem of resource allocation in a multiple access channel where several Mobile Terminals (MT's) are transmitting simultaneously to a single receiving base station, all...
Provided by Universitat Politecnica de Catalunya
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Whitepapers
Recent Advances in Burst Mode Communications for Extended Fiber-to-the-Home Networks
April 7, 2011, 12:00am PDT
In this paper, the authors present recent advances in burst mode operation for WDM/TDM networks, focusing on mitigation techniques implemented at the ONU, as well as ONUONU cross-streaming. Direct...
Provided by Universitat Politecnica de Catalunya
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White Papers
A Max Coverage Formulation for Information Dissemination in Vehicular Networks
June 5, 2009, 12:00am PDT
The authors consider that k infrastructured nodes have to be deployed for disseminating information to vehicles travelling in an urban area. They name the infrastructure nodes Dissemination Points...
Provided by Universitat Politecnica de Catalunya
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White Papers
Adaptive Scheduling on Power-Aware Managed Data-Centers Using Machine Learning
August 29, 2011, 12:00am PDT
Energy-related costs have become one of the major economic factors in IT data-centers, and companies and the research community are currently working on new efficient power-aware resource...
Provided by Universitat Politecnica de Catalunya
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White Papers
A Novel Offline Physical Layer Impairments Aware RWA Algorithm With Dedicated Path Protection Consideration
July 5, 2010, 12:00am PDT
Physical layer impairments accumulate as light propagates through a lightpath in the transparent optical networks. Therefore it is possible to provision a lightpath, while its Quality of...
Provided by Universitat Politecnica de Catalunya
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White Papers
A Novel Impairment Aware RWA Algorithm With Consideration for QoT Estimation Inaccuracy
January 1, 2011, 12:00am PST
In all-optical networks the physical layer impairments accumulate along a lightpath and also vary dynamically, and a number of Impairment Aware Routing and Wavelength Assignment (IA-RWA)...
Provided by Universitat Politecnica de Catalunya
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White Papers
Measurement Based Call Quality Reporting
July 20, 2007, 12:00am PDT
Real-time traffic is an important issue when designing networks. The growth in the deployment of voice applications in packet switched networks requires that the network can deliver such traffic...
Provided by Universitat Politecnica de Catalunya
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White Papers
OBGP+: A Simple Approach to Drastically Improve OBGP
February 6, 2008, 12:00am PST
During the last few years, the research community has shown an increasing interest in the subject of inter-domain routing in optical networks, so new approaches like the optical extension of BGP,...
Provided by Universitat Politecnica de Catalunya
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White Papers
Distributed Sampling for On-line SLA Assessment
June 20, 2008, 12:00am PDT
New business infrastructures over the Internet pose a new set of traffic constraints. In particular, multimedia and interactive contents require guarantees of bandwidth and delivery time. The...
Provided by Universitat Politecnica de Catalunya
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White Papers
On the Challenges of Finding Two Linkdisjoint Lightpaths of Minimum Total Weight Across an Optical Network
June 26, 2009, 12:00am PDT
The problem of finding two link-disjoint (primary and backup) paths of minimum total weight across a network is referred to as Problem 2DP. For this problem, there exist computationally efficient...
Provided by Universitat Politecnica de Catalunya
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White Papers
The Effects of Optimized Regenerator Allocation in Translucent Networks Under Inaccurate Physical information
December 17, 2009, 12:00am PST
Optimized regenerator allocation techniques select which of the already installed regenerators in a translucent network must be used in order to maximize the quality of the optical signal while...
Provided by Universitat Politecnica de Catalunya
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White Papers
Cross-Talk Effects on the Regenerator Allocation Optimization
December 23, 2010, 12:00am PST
This paper studies the impact of considering crosstalk effects in the IA-RWA process and in the regenerator allocation algorithms. First of all, the authors evaluate if the regenerator allocation...
Provided by Universitat Politecnica de Catalunya
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White Papers
XtreemFS - A Case for Object-Based Storage in Grid Data Management
September 6, 2007, 12:00am PDT
In today's Grids, files are usually managed by Grid data management systems that are superimposed on existing file and storage systems. In this position paper, the authors analyze this predominant...
Provided by Universitat Politecnica de Catalunya
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White Papers
Multi-Radio Cooperative ARQ in Wireless Cellular Networks: A MAC Layer Perspective
April 13, 2010, 12:00am PDT
Multi-Radio Cooperative Automatic Retransmission ReQuest (MCARQ) schemes are introduced in this paper within the context of hybrid networks which combine long-range and short-range communications....
Provided by Universitat Politecnica de Catalunya
-
White Papers
Coexistence of a Novel Medium Access Control Protocol for Wireless Ad Hoc Networks and the IEEE 802.11
February 8, 2010, 12:00am PST
The authors describe in this paper a methodology to facilitate the coexistence of the Distributed Queuing Medium Access Control (MAC) protocol for Ad hoc Networks (DQMAN) with the IEEE 802.11...
Provided by Universitat Politecnica de Catalunya
-
White Papers
Energy-Delay Tradeoff Analysis in Embedded M2M Networks With Channel Coding
June 7, 2010, 12:00am PDT
Machine-To-Machine (M2M), an emerging communications paradigm, is a facilitator of data flows between machines used, e.g., in mission-critical applications. Focusing in this paper on embedded...
Provided by Universitat Politecnica de Catalunya
-
White Papers
Analytical Evaluation of a Medium Access Control Priority Mechanism for Wireless Ad Hoc Networks
August 5, 2009, 12:00am PDT
The authors present in this paper the analytical evaluation of a simple mechanism to reduce the average transmission delay of master stations in a network based on the Distributed Queuing MAC...
Provided by Universitat Politecnica de Catalunya
-
White Papers
Handoff Functions for a Distributed Queuing Collision Avoidance Medium Access Control Protocol for Wireless LANs
August 3, 2009, 12:00am PDT
The Distributed Queuing with Collision Avoidance (DQCA) Medium Access Control (MAC) protocol has been presented in the literature as a high-performance protocol for up-link traffic in WLANs....
Provided by Universitat Politecnica de Catalunya
-
White Papers
Strengthening Radio Environment Maps With Primary-User Statistical Patterns for Enhancing Cognitive Radio Operation
July 13, 2011, 12:00am PDT
In order to increase spectrum utilization efficiency, CRs (Cognitive Radios) have been introduced to reuse white spaces left unused by legacy services under the strict constraint of not...
Provided by Universitat Politecnica de Catalunya
-
White Papers
A Novel Spectrum Selection Strategy for Matching Multi-Service Secondary Traffic to Heterogeneous Primary Spectrum Opportunities
April 28, 2011, 12:00am PDT
In order to increase spectrum utilization efficiency, CRs (Cognitive Radios) have been introduced to reuse white spaces left unused by legacy services under the strict constraint of not...
Provided by Universitat Politecnica de Catalunya
-
White Papers
A Framework Based on a Fittingness Factor to Enable Efficient Exploitation of Spectrum Opportunities in Cognitive Radio Networks
September 14, 2011, 12:00am PDT
In order to increase CRs (Cognitive Radios) operation efficiency, there has been an interest in increasing awareness level about spectrum utilisation. In this respect, this paper proposes a new...
Provided by Universitat Politecnica de Catalunya
-
White Papers
On the Role of Spectrum Selection to Improve Coverage Extension Through Opportunistic Networks
September 6, 2011, 12:00am PDT
This paper discusses the role played by Opportunistic Networks (ONs) as a means to bring Future Internet services to users in different situations. After the identification of technical challenges...
Provided by Universitat Politecnica de Catalunya
-
White Papers
Simulated Annealing-Based Advanced Spectrum Management Methodology for WCDMA Systems
June 7, 2008, 12:00am PDT
In this paper, the authors propose a new Advanced Spectrum Management (ASM) methodology for WCDMA systems using simulated annealing and the concept of coupling matrix, which is able to capture...
Provided by Universitat Politecnica de Catalunya
-
White Papers
Advanced Spectrum Management for the Downlink of WCDMA Systems Using Genetic Algorithms
January 16, 2009, 12:00am PST
In this paper, the authors propose an advanced spectrum management approach for the downlink of WCDMA systems using genetic algorithms and the concept of coupling matrix, which is able to capture...
Provided by Universitat Politecnica de Catalunya
-
White Papers
Positioning-Based Framework for Secondary Spectrum Usage
July 9, 2009, 12:00am PDT
In this paper, the authors introduce a framework encompassing the creation and the exploitation of secondary spectrum usage opportunities. The paper develops a complete positioning-based framework...
Provided by Universitat Politecnica de Catalunya
-
White Papers
A Real-Time FPGA-Based Mobile WiMAX Transceiver Supporting Multi-Antenna Configurations
September 11, 2011, 12:00am PDT
This paper presents the design, implementation and experimental validation of a real-time FPGA-based mobile WiMAX baseband transceiver. Three different antenna configuration schemes were...
Provided by Universitat Politecnica de Catalunya
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