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Universitat Pompeu Fabra
(37 results)-
White Papers
A WiMAX-Based Implementation of Network MIMO for Indoor Wireless Systems
July 1, 2009, 12:00am PDT
It is well known that Multiple-Input Multiple-Output (MIMO) techniques can bring numerous benefits, such as higher spectral efficiency, to point-to-point wireless links. More recently, there has...
Provided by Universitat Pompeu Fabra
-
White Papers
SmsPerformer: A Real-Time Synthesis Interface for SMS
January 1, 2010, 12:00am PST
SmsPerformer is a graphical interface for the real-time SMS synthesis engine. The application works from analyzed sounds and it has been designed to be used both as a composition and a performance...
Provided by Universitat Pompeu Fabra
-
White Papers
A Business Case for the Deployment of a 4G Wireless Heterogeneous Network in Spain
September 4, 2007, 12:00am PDT
The emergence of wireless packet-switched networks such as UMTS, WLAN and WiMAX allows the introduction of innovative services and opens up a new range of revenues. It is considered that 4G...
Provided by Universitat Pompeu Fabra
-
White Papers
Secure and Efficient Data Collection in Sensor Networks
January 7, 2008, 12:00am PST
Sensor networks are a very specific type of wireless networks where both security and performance issues need to be solved efficiently in order to avoid manipulations of the sensed data and at the...
Provided by Universitat Pompeu Fabra
-
White Papers
Flat Soft-Synchronization for Gigabit Ethernet
March 27, 2009, 12:00am PDT
This paper presents a synchronization platform for synchronizing nodes in a Gigabit Ethernet network. There are two key concepts in this paper. The first is the implementation of a...
Provided by Universitat Pompeu Fabra
-
White Papers
A Zero-Nanosecond Time Synchronization Platform for Gigabit Ethernet Links
February 10, 2010, 12:00am PST
Ethernet is becoming the dominant data transmission technology for service providers due to its simplicity and low cost. However, the need for Quality of Service (QoS) provisioning for some...
Provided by Universitat Pompeu Fabra
-
White Papers
Neighbor Discovery in Wireless Networks: A Multiuser-Detection Approach
February 5, 2008, 12:00am PST
The authors examine the problem of determining which nodes are neighbors of a given one in a wireless network. They consider an unsupervised network operating on a frequency-flat Gaussian channel,...
Provided by Universitat Pompeu Fabra
-
White Papers
Credit Constraints, Firms~ Precautionary Investment, And The Business Cycle
September 15, 2010, 12:00am PDT
This paper studies the macroeconomic implications of firms' precautionary investment behavior in response to anticipation of future financing constraints. Firms increase their demand for liquid...
Provided by Universitat Pompeu Fabra
-
White Papers
Neglected Risks, Financial Innovation, and Financial Fragility
September 1, 2010, 12:00am PDT
The authors present a standard model of financial innovation, in which intermediaries engineer securities with cash flows that investors seek, but modify two assumptions. First, investors (and...
Provided by Universitat Pompeu Fabra
-
White Papers
Conglomeration With Bankruptcy Costs: Separate Or Joint Financing?
July 1, 2010, 12:00am PDT
The paper analyzes the determinants of the optimal scope of incorporation in the presence of bankruptcy costs. Bankruptcy costs alone generate a non-trivial tradeoff between the benefit of...
Provided by Universitat Pompeu Fabra
-
White Papers
Monetary Policy In A Systemic Crisis
November 10, 2009, 12:00am PST
This paper examines the monetary policy followed during the current financial crisis from the perspective of the theory of the lender of last resort. It is argued that standard monetary policy...
Provided by Universitat Pompeu Fabra
-
White Papers
Econometrics And Decision Making: Effects Of Presentation Mode
February 11, 2010, 12:00am PST
Much of empirical economics involves regression analysis. However, does the presentation of results affect economists' ability to make inferences for decision making purposes? In a survey, 257...
Provided by Universitat Pompeu Fabra
-
White Papers
Prime Property Institutions For A Subprime Era: Exploring Innovative Models Of Residential Development And Finance
May 5, 2010, 12:00am PDT
This paper breaks new ground toward contractual and institutional innovation in models of homeownership, equity building, and mortgage enforcement. Inspired by recent developments in the...
Provided by Universitat Pompeu Fabra
-
White Papers
A Unifying Approach To The Empirical Evaluation Of Asset Pricing Models
July 1, 2010, 12:00am PDT
Two main approaches are commonly used to empirically evaluate linear factor pricing models: regression and SDF methods, with centred and uncentred versions of the latter. The authors show that...
Provided by Universitat Pompeu Fabra
-
White Papers
A Retail Benchmarking Approach To Efficient Two-Way Access Pricing
October 31, 2007, 12:00am PDT
The authors study a retail benchmarking approach to determine access prices for interconnected networks. Instead of considering fixed access charges as in the existing literature, they study...
Provided by Universitat Pompeu Fabra
-
White Papers
International Commodity Prices, Growth, And The Outbreak Of Civil War In Sub-Saharan Africa
August 1, 2009, 12:00am PDT
To learn more about the effect of economic conditions on civil war, the authors examine whether Sub-Saharan civil wars are more likely to start following downturns in the international price of...
Provided by Universitat Pompeu Fabra
-
White Papers
The Role Of Interbank Markets In Monetary Policy: A Model With Rationing
April 12, 2008, 12:00am PDT
This paper analyses the impact of asymmetric information in the interbank market and establishes its crucial role in the micro foundations of the monetary policy transmission mechanism. The...
Provided by Universitat Pompeu Fabra
-
White Papers
The Impact Of Tax Credits On Labor Supply
July 1, 2009, 12:00am PDT
One of the principle aims of the Working Families' Tax Credit in the UK was to increase the participation of single mothers. The literature to date concludes there was approximately a...
Provided by Universitat Pompeu Fabra
-
White Papers
Decision Making In Uncertain And Changing Environments
June 2, 2009, 12:00am PDT
The authors consider an agent who has to repeatedly make choices in an uncertain and changing environment, who has full information of the past, who discounts future payoffs, but who has no prior....
Provided by Universitat Pompeu Fabra
-
White Papers
Generating Global Brand Equity Through Corporate Social Responsibility To Key Stakeholders
September 23, 2010, 12:00am PDT
In this paper, the authors argue that socially responsible policies have positive short-term and long-term impact on equity of global brands. They find that corporate social responsibility towards...
Provided by Universitat Pompeu Fabra
-
White Papers
Rethinking The Effects Of Financial Liberalization
July 1, 2010, 12:00am PDT
During the last few decades, many emerging markets have lifted most restrictions on international asset trade. The conventional view was that capital would flow into these countries raising...
Provided by Universitat Pompeu Fabra
-
White Papers
Accelerating Into The Abyss: Financial Dependence And The Great Depression
July 11, 2011, 12:00am PDT
The author's paper provides empirical support for the importance of financial distress in the propagation of the Great Depression. Even those in agreement are not unanimous in the mechanisms they...
Provided by Universitat Pompeu Fabra
-
White Papers
An Approximate Queueing Model for Multi-Rate Multi-User MIMO Systems
April 11, 2011, 12:00am PDT
A queueing model for multi-rate multi-user MIMO systems is presented. The model is built upon the assumption that the probability distribution of available destinations among the buffered frames...
Provided by Universitat Pompeu Fabra
-
White Papers
DCF/DSDMA: Enhanced DCF With SDMA Downlink Transmissions for WLANs
February 22, 2011, 12:00am PST
Multi-user MIMO is a promising technology to enhance the performance of WLANs. However, the MAC protocol of the IEEE 802.11 standard (the DCF MAC protocol) is not able to solve the new...
Provided by Universitat Pompeu Fabra
-
White Papers
Dynamic Parameter Adjustment in CSMA/ECA
July 20, 2010, 12:00am PDT
CSMA/ECA is a modification of CSMA/CA that delivers higher performance by reducing the number of collisions. This paper presents an algorithm to adapt a configuration parameter of the protocol to...
Provided by Universitat Pompeu Fabra
-
White Papers
A Queuing Model for the Non-Continuous Frame Assembly Scheme in Finite Buffers
April 5, 2009, 12:00am PDT
A batch-service finite-buffer queuing model for the non continuous frame assembly scheme is presented. The steady-state probabilities are computed by simply solving the bi-dimensional Markov chain...
Provided by Universitat Pompeu Fabra
-
White Papers
No Ack in IEEE 802.11e Single-Hop Ad-Hoc VoIP Networks
January 15, 2008, 12:00am PST
This paper analyzes the impact of the No Ack policy in VoIP ad-hoc single-hop IEEE 802.11e networks. The No Ack policy consists on suppressing the MAC layer acknowledgement packets. This option...
Provided by Universitat Pompeu Fabra
-
White Papers
Multihop Cluster-Based Architecture for Sparse Wireless Sensor Networks
May 3, 2008, 12:00am PDT
Cluster-based architectures are one of the most practical solutions in order to cope with the requirements of large-scale WSNs. In this paper a new cluster-based architecture for sparse WSNs is...
Provided by Universitat Pompeu Fabra
-
White Papers
Voice Over IP in the WiFi Network Business Models: Will Voice Be a Killer Application for WiFi Public Networks?
May 1, 2008, 12:00am PDT
The stunning growth of WiFi networks, together with the spreading of mobile telephony and the increasing use of Voice over IP (VoIP) on top of Internet, pose relevant questions on the application...
Provided by Universitat Pompeu Fabra
-
White Papers
VoIP Packet Delay in Single-Hop Ad-Hoc IEEE 802.11 Networks
December 5, 2007, 12:00am PST
This paper presents a joint VoIP/IEEE 802.11 model for ad-hoc networks. The model calculates the average number of collisions and the average packet delay. It is used to predict the impact of...
Provided by Universitat Pompeu Fabra
-
White Papers
Evaluation of Joint Admission Control and VoIP Codec Selection Policies in Generic Multirate Wireless Networks
April 19, 2008, 12:00am PDT
Multirate wireless networks in general share a common problem for the transmission of VoIP traffic, since the rate changes of some of the flows affect the transmission of all others, which causes...
Provided by Universitat Pompeu Fabra
-
White Papers
VoIP Codec Adaptation Algorithm in Multirate 802.11 WLANs : Distributed Vs Centralized Performance Comparison
February 13, 2008, 12:00am PST
Multirate 802.11 environments are quite problematic for VoIP traffic, with the rate changes of some of the flows affecting the transmission of all others. Building upon the authors' previous...
Provided by Universitat Pompeu Fabra
-
White Papers
Judicial Discretion In Corporate Bankruptcy
December 1, 2007, 12:00am PST
The authors study a demand and supply model of judicial discretion in corporate bankruptcy. On the supply side, they assume that bankruptcy courts may be biased for debtors or creditors, and...
Provided by Universitat Pompeu Fabra
-
White Papers
A Comparative Survey of Adaptive Codec Solutions for VoIP Over Multirate WLANs: A Capacity Versus Quality Performance Trade-Off
February 17, 2011, 12:00am PST
In multi-rate WLANs, users can suffer transmission rate changes due to the link adaptation mechanism. This results in a variable capacity channel, which is very hostile for VoIP and can cause...
Provided by Universitat Pompeu Fabra
-
White Papers
CsoundXML: A Meta-Language in XML for Sound Synthesis
January 1, 2008, 12:00am PST
The software sound synthesis is closely related to the Music N programs started with Music I in 1957. Although Music N has many advantages such as unit generators and a flexible score language, it...
Provided by Universitat Pompeu Fabra
-
White Papers
On the Limitations of Cooperation in Wireless Networks
January 30, 2012, 12:00am PST
Cooperation in a large wireless network (such as a cellular system) is shown to have certain fundamental limitations: namely, even perfect cooperation cannot in general change an...
Provided by Universitat Pompeu Fabra
-
White Papers
An Analysis of MIMO Techniques for Mobile WiMAX Systems
March 11, 2008, 12:00am PDT
Multiple Input Multiple Output (MIMO) techniques are an essential part of the IEEE 802.16e - 2005 specifications, which form the basis of mobile WiMAX systems. This paper discusses the basic...
Provided by Universitat Pompeu Fabra
-
White Papers
On the Limitations of Cooperation in Wireless Networks
January 30, 2012, 12:00am PST
Cooperation in a large wireless network (such as a cellular system) is shown to have certain fundamental limitations: namely, even perfect cooperation cannot in general change an...
Provided by Universitat Pompeu Fabra
-
White Papers
A Comparative Survey of Adaptive Codec Solutions for VoIP Over Multirate WLANs: A Capacity Versus Quality Performance Trade-Off
February 17, 2011, 12:00am PST
In multi-rate WLANs, users can suffer transmission rate changes due to the link adaptation mechanism. This results in a variable capacity channel, which is very hostile for VoIP and can cause...
Provided by Universitat Pompeu Fabra
-
White Papers
Judicial Discretion In Corporate Bankruptcy
December 1, 2007, 12:00am PST
The authors study a demand and supply model of judicial discretion in corporate bankruptcy. On the supply side, they assume that bankruptcy courts may be biased for debtors or creditors, and...
Provided by Universitat Pompeu Fabra
-
White Papers
VoIP Codec Adaptation Algorithm in Multirate 802.11 WLANs : Distributed Vs Centralized Performance Comparison
February 13, 2008, 12:00am PST
Multirate 802.11 environments are quite problematic for VoIP traffic, with the rate changes of some of the flows affecting the transmission of all others. Building upon the authors' previous...
Provided by Universitat Pompeu Fabra
-
White Papers
Evaluation of Joint Admission Control and VoIP Codec Selection Policies in Generic Multirate Wireless Networks
April 19, 2008, 12:00am PDT
Multirate wireless networks in general share a common problem for the transmission of VoIP traffic, since the rate changes of some of the flows affect the transmission of all others, which causes...
Provided by Universitat Pompeu Fabra
-
White Papers
VoIP Packet Delay in Single-Hop Ad-Hoc IEEE 802.11 Networks
December 5, 2007, 12:00am PST
This paper presents a joint VoIP/IEEE 802.11 model for ad-hoc networks. The model calculates the average number of collisions and the average packet delay. It is used to predict the impact of...
Provided by Universitat Pompeu Fabra
-
White Papers
Voice Over IP in the WiFi Network Business Models: Will Voice Be a Killer Application for WiFi Public Networks?
May 1, 2008, 12:00am PDT
The stunning growth of WiFi networks, together with the spreading of mobile telephony and the increasing use of Voice over IP (VoIP) on top of Internet, pose relevant questions on the application...
Provided by Universitat Pompeu Fabra
-
White Papers
Multihop Cluster-Based Architecture for Sparse Wireless Sensor Networks
May 3, 2008, 12:00am PDT
Cluster-based architectures are one of the most practical solutions in order to cope with the requirements of large-scale WSNs. In this paper a new cluster-based architecture for sparse WSNs is...
Provided by Universitat Pompeu Fabra
-
White Papers
No Ack in IEEE 802.11e Single-Hop Ad-Hoc VoIP Networks
January 15, 2008, 12:00am PST
This paper analyzes the impact of the No Ack policy in VoIP ad-hoc single-hop IEEE 802.11e networks. The No Ack policy consists on suppressing the MAC layer acknowledgement packets. This option...
Provided by Universitat Pompeu Fabra
-
White Papers
A Queuing Model for the Non-Continuous Frame Assembly Scheme in Finite Buffers
April 5, 2009, 12:00am PDT
A batch-service finite-buffer queuing model for the non continuous frame assembly scheme is presented. The steady-state probabilities are computed by simply solving the bi-dimensional Markov chain...
Provided by Universitat Pompeu Fabra
-
White Papers
Dynamic Parameter Adjustment in CSMA/ECA
July 20, 2010, 12:00am PDT
CSMA/ECA is a modification of CSMA/CA that delivers higher performance by reducing the number of collisions. This paper presents an algorithm to adapt a configuration parameter of the protocol to...
Provided by Universitat Pompeu Fabra
-
White Papers
DCF/DSDMA: Enhanced DCF With SDMA Downlink Transmissions for WLANs
February 22, 2011, 12:00am PST
Multi-user MIMO is a promising technology to enhance the performance of WLANs. However, the MAC protocol of the IEEE 802.11 standard (the DCF MAC protocol) is not able to solve the new...
Provided by Universitat Pompeu Fabra
-
White Papers
An Approximate Queueing Model for Multi-Rate Multi-User MIMO Systems
April 11, 2011, 12:00am PDT
A queueing model for multi-rate multi-user MIMO systems is presented. The model is built upon the assumption that the probability distribution of available destinations among the buffered frames...
Provided by Universitat Pompeu Fabra
-
White Papers
Accelerating Into The Abyss: Financial Dependence And The Great Depression
July 11, 2011, 12:00am PDT
The author's paper provides empirical support for the importance of financial distress in the propagation of the Great Depression. Even those in agreement are not unanimous in the mechanisms they...
Provided by Universitat Pompeu Fabra
-
White Papers
Rethinking The Effects Of Financial Liberalization
July 1, 2010, 12:00am PDT
During the last few decades, many emerging markets have lifted most restrictions on international asset trade. The conventional view was that capital would flow into these countries raising...
Provided by Universitat Pompeu Fabra
-
White Papers
Generating Global Brand Equity Through Corporate Social Responsibility To Key Stakeholders
September 23, 2010, 12:00am PDT
In this paper, the authors argue that socially responsible policies have positive short-term and long-term impact on equity of global brands. They find that corporate social responsibility towards...
Provided by Universitat Pompeu Fabra
-
White Papers
Decision Making In Uncertain And Changing Environments
June 2, 2009, 12:00am PDT
The authors consider an agent who has to repeatedly make choices in an uncertain and changing environment, who has full information of the past, who discounts future payoffs, but who has no prior....
Provided by Universitat Pompeu Fabra
-
White Papers
The Impact Of Tax Credits On Labor Supply
July 1, 2009, 12:00am PDT
One of the principle aims of the Working Families' Tax Credit in the UK was to increase the participation of single mothers. The literature to date concludes there was approximately a...
Provided by Universitat Pompeu Fabra
-
White Papers
The Role Of Interbank Markets In Monetary Policy: A Model With Rationing
April 12, 2008, 12:00am PDT
This paper analyses the impact of asymmetric information in the interbank market and establishes its crucial role in the micro foundations of the monetary policy transmission mechanism. The...
Provided by Universitat Pompeu Fabra
-
White Papers
International Commodity Prices, Growth, And The Outbreak Of Civil War In Sub-Saharan Africa
August 1, 2009, 12:00am PDT
To learn more about the effect of economic conditions on civil war, the authors examine whether Sub-Saharan civil wars are more likely to start following downturns in the international price of...
Provided by Universitat Pompeu Fabra
-
White Papers
A Retail Benchmarking Approach To Efficient Two-Way Access Pricing
October 31, 2007, 12:00am PDT
The authors study a retail benchmarking approach to determine access prices for interconnected networks. Instead of considering fixed access charges as in the existing literature, they study...
Provided by Universitat Pompeu Fabra
-
White Papers
A Unifying Approach To The Empirical Evaluation Of Asset Pricing Models
July 1, 2010, 12:00am PDT
Two main approaches are commonly used to empirically evaluate linear factor pricing models: regression and SDF methods, with centred and uncentred versions of the latter. The authors show that...
Provided by Universitat Pompeu Fabra
-
White Papers
Prime Property Institutions For A Subprime Era: Exploring Innovative Models Of Residential Development And Finance
May 5, 2010, 12:00am PDT
This paper breaks new ground toward contractual and institutional innovation in models of homeownership, equity building, and mortgage enforcement. Inspired by recent developments in the...
Provided by Universitat Pompeu Fabra
-
White Papers
Econometrics And Decision Making: Effects Of Presentation Mode
February 11, 2010, 12:00am PST
Much of empirical economics involves regression analysis. However, does the presentation of results affect economists' ability to make inferences for decision making purposes? In a survey, 257...
Provided by Universitat Pompeu Fabra
-
White Papers
Monetary Policy In A Systemic Crisis
November 10, 2009, 12:00am PST
This paper examines the monetary policy followed during the current financial crisis from the perspective of the theory of the lender of last resort. It is argued that standard monetary policy...
Provided by Universitat Pompeu Fabra
-
White Papers
Conglomeration With Bankruptcy Costs: Separate Or Joint Financing?
July 1, 2010, 12:00am PDT
The paper analyzes the determinants of the optimal scope of incorporation in the presence of bankruptcy costs. Bankruptcy costs alone generate a non-trivial tradeoff between the benefit of...
Provided by Universitat Pompeu Fabra
-
White Papers
Neglected Risks, Financial Innovation, and Financial Fragility
September 1, 2010, 12:00am PDT
The authors present a standard model of financial innovation, in which intermediaries engineer securities with cash flows that investors seek, but modify two assumptions. First, investors (and...
Provided by Universitat Pompeu Fabra
-
White Papers
Credit Constraints, Firms~ Precautionary Investment, And The Business Cycle
September 15, 2010, 12:00am PDT
This paper studies the macroeconomic implications of firms' precautionary investment behavior in response to anticipation of future financing constraints. Firms increase their demand for liquid...
Provided by Universitat Pompeu Fabra
-
White Papers
Neighbor Discovery in Wireless Networks: A Multiuser-Detection Approach
February 5, 2008, 12:00am PST
The authors examine the problem of determining which nodes are neighbors of a given one in a wireless network. They consider an unsupervised network operating on a frequency-flat Gaussian channel,...
Provided by Universitat Pompeu Fabra
-
White Papers
A Zero-Nanosecond Time Synchronization Platform for Gigabit Ethernet Links
February 10, 2010, 12:00am PST
Ethernet is becoming the dominant data transmission technology for service providers due to its simplicity and low cost. However, the need for Quality of Service (QoS) provisioning for some...
Provided by Universitat Pompeu Fabra
-
White Papers
Flat Soft-Synchronization for Gigabit Ethernet
March 27, 2009, 12:00am PDT
This paper presents a synchronization platform for synchronizing nodes in a Gigabit Ethernet network. There are two key concepts in this paper. The first is the implementation of a...
Provided by Universitat Pompeu Fabra
-
White Papers
Secure and Efficient Data Collection in Sensor Networks
January 7, 2008, 12:00am PST
Sensor networks are a very specific type of wireless networks where both security and performance issues need to be solved efficiently in order to avoid manipulations of the sensed data and at the...
Provided by Universitat Pompeu Fabra
-
White Papers
A Business Case for the Deployment of a 4G Wireless Heterogeneous Network in Spain
September 4, 2007, 12:00am PDT
The emergence of wireless packet-switched networks such as UMTS, WLAN and WiMAX allows the introduction of innovative services and opens up a new range of revenues. It is considered that 4G...
Provided by Universitat Pompeu Fabra
-
White Papers
SmsPerformer: A Real-Time Synthesis Interface for SMS
January 1, 2010, 12:00am PST
SmsPerformer is a graphical interface for the real-time SMS synthesis engine. The application works from analyzed sounds and it has been designed to be used both as a composition and a performance...
Provided by Universitat Pompeu Fabra
-
White Papers
A WiMAX-Based Implementation of Network MIMO for Indoor Wireless Systems
July 1, 2009, 12:00am PDT
It is well known that Multiple-Input Multiple-Output (MIMO) techniques can bring numerous benefits, such as higher spectral efficiency, to point-to-point wireless links. More recently, there has...
Provided by Universitat Pompeu Fabra
-
White Papers
An Analysis of MIMO Techniques for Mobile WiMAX Systems
March 11, 2008, 12:00am PDT
Multiple Input Multiple Output (MIMO) techniques are an essential part of the IEEE 802.16e - 2005 specifications, which form the basis of mobile WiMAX systems. This paper discusses the basic...
Provided by Universitat Pompeu Fabra
-
White Papers
CsoundXML: A Meta-Language in XML for Sound Synthesis
January 1, 2008, 12:00am PST
The software sound synthesis is closely related to the Music N programs started with Music I in 1957. Although Music N has many advantages such as unit generators and a flexible score language, it...
Provided by Universitat Pompeu Fabra
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