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Instituto de Telecomunicacoes
(16 results)-
White Papers
Comparison Between UMTS/HSPA+ and WiMAX/IEEE 802.16e in Mobility Scenarios
January 26, 2009, 12:00am PST
The main purpose of this paper is to compare the performance of UMTS/HSPA+ and mWiMAX. Two scenarios were considered: single and multiple users. The single user model estimates the cell radius for...
Provided by Instituto de Telecomunicacoes
-
White Papers
Design and Optimization Next-Generation All-Optical Passive Networks
November 15, 2009, 12:00am PST
This paper describes the progress of the work plan named "Design and Optimization Next Generation Passive All-Optical Networks". The first part of this report focuses on summarizing the status of...
Provided by Instituto de Telecomunicacoes
-
Whitepapers
Anomaly Detection Using DSNS and Firefly Harmonic Clustering Algorithm
May 24, 2012, 12:00am PDT
The networks are becoming an essential part of society life and anomalies may represent a loss in network performance. Modeling the traffic behavior pattern is possible to predict the behavior...
Provided by Instituto de Telecomunicacoes
-
Whitepapers
On-Demand Selection, Control and Management of Context-Based Wireless Mesh Networks
May 24, 2012, 12:00am PDT
The flexible infrastructure of Wireless Mesh Networks (WMNs) can be exploited to provide support to emerging communication paradigms. In this paper, the authors consider an architecture of...
Provided by Instituto de Telecomunicacoes
-
Whitepapers
Energy Saving Through Cooperation Using Game Theory-Based Trading Model
May 24, 2012, 12:00am PDT
Recent years have witnessed an explosive growth of wireless technologies and applications. The adoption of a wide range of multimedia applications on wireless devices has been made possible...
Provided by Instituto de Telecomunicacoes
-
Whitepapers
Secure Framework for Voice Transmission Over Multipath Wireless Ad-hoc Network
October 27, 2009, 12:00am PDT
With the growth of the Internet services, Voice over IP (VoIP) has been playing a key role in cutting the costs of telephone calls. It can be seen that since the demand of VoIP over wireless...
Provided by Instituto de Telecomunicacoes
-
White Papers
Converged Wireless Networking and Optimization for Next Generation Services
June 6, 2010, 12:00am PDT
The Next Generation Network (NGN) vision is tending towards the convergence of internet and mobile services providing the impetus for new market opportunities in combining the appealing services...
Provided by Instituto de Telecomunicacoes
-
White Papers
Simulation of IEEE 802.11e in the Context of Interoperability
October 2, 2007, 12:00am PDT
This paper provides the specification of a MAC layer simulator that evaluates the service quality in WiFi, and presents initial results as a stand-alone simulator. The simulator will account for...
Provided by Instituto de Telecomunicacoes
-
White Papers
Cost/Revenue Optimisation of Multi-Service Cellular Planning for Business Centre Enhanced
October 2, 2007, 12:00am PDT
Enhanced UMTS, E-UMTS, is a UMTS evolution step which provides bit rates higher than 2 Mbit/s in the uplink and downlink directions over a 5 MHz frequency carrier. It enables the provision of new...
Provided by Instituto de Telecomunicacoes
-
White Papers
Design and Planning of IEEE 802.16 Networks
October 2, 2007, 12:00am PDT
This paper presents aspects of design of WiMAX (World Interoperability for Microwave Access) wireless point-to-point, PTP, networks. The objective is to connect the Health Science Faculty of the...
Provided by Instituto de Telecomunicacoes
-
White Papers
Estimation of the Feedback Reliability for IB-DFE Receivers
June 6, 2011, 12:00am PDT
Single-Carrier (SC) modulation with Frequency-Domain Equalization (FDE) combined with iterative (turbo) FDE schemes has been shown to be suitable for Cyclic-Prefix (CP)-assisted block transmission...
Provided by Instituto de Telecomunicacoes
-
White Papers
FEBER: Feedback Based Erasure Recovery for Real-Time Multicast Over 802.11 Networks
September 6, 2011, 12:00am PDT
The authors consider the problem of broadcasting data streams over a wireless network for multiple receivers with reliability and timely delivery guarantees. In their framework, they consider...
Provided by Instituto de Telecomunicacoes
-
White Papers
A Novel Relay Selection Game in Cooperative Wireless Networks Based on Combinatorial Optimization
February 18, 2011, 12:00am PST
Multi-standard mobile devices are allowing users to experience higher data rates and ubiquitous connectivity. These advances are achieved on the expense of higher energy consumption due to the...
Provided by Instituto de Telecomunicacoes
-
White Papers
C2POWER Approach for Power Saving in Multi-Standard Wireless Devices
July 15, 2010, 12:00am PDT
4G networks promise higher data rates and continuous connectivity to multi-standard mobile devices, but at the expense of higher power requirements. Energy is a critical resource for mobile...
Provided by Instituto de Telecomunicacoes
-
White Papers
Iterative Decoding and Channel Estimation of MIMO-OFDM Transmissions With Hierarchical Constellations and Implict Pilots
January 1, 2012, 12:00am PST
It is widely recognized that OFDM modulations (Orthogonal Frequency Division Multiplexing) are suitable for broadband wireless systems. For this reason they were selected for several digital...
Provided by Instituto de Telecomunicacoes
-
White Papers
Efficient Channel Estimation for OFDM Systems With Hierarchical Constellations
August 29, 2007, 12:00am PDT
In this paper, the authors consider the use of M-QAM hierarchical constellations (Quadrature Amplitude Modulation) combined with implicit pilots for the transmission of multicast and broadcast...
Provided by Instituto de Telecomunicacoes
-
Whitepapers
Secure Framework for Voice Transmission Over Multipath Wireless Ad-hoc Network
October 27, 2009, 12:00am PDT
With the growth of the Internet services, Voice over IP (VoIP) has been playing a key role in cutting the costs of telephone calls. It can be seen that since the demand of VoIP over wireless...
Provided by Instituto de Telecomunicacoes
-
Whitepapers
Energy Saving Through Cooperation Using Game Theory-Based Trading Model
May 24, 2012, 12:00am PDT
Recent years have witnessed an explosive growth of wireless technologies and applications. The adoption of a wide range of multimedia applications on wireless devices has been made possible...
Provided by Instituto de Telecomunicacoes
-
Whitepapers
On-Demand Selection, Control and Management of Context-Based Wireless Mesh Networks
May 24, 2012, 12:00am PDT
The flexible infrastructure of Wireless Mesh Networks (WMNs) can be exploited to provide support to emerging communication paradigms. In this paper, the authors consider an architecture of...
Provided by Instituto de Telecomunicacoes
-
Whitepapers
Anomaly Detection Using DSNS and Firefly Harmonic Clustering Algorithm
May 24, 2012, 12:00am PDT
The networks are becoming an essential part of society life and anomalies may represent a loss in network performance. Modeling the traffic behavior pattern is possible to predict the behavior...
Provided by Instituto de Telecomunicacoes
-
White Papers
Efficient Channel Estimation for OFDM Systems With Hierarchical Constellations
August 29, 2007, 12:00am PDT
In this paper, the authors consider the use of M-QAM hierarchical constellations (Quadrature Amplitude Modulation) combined with implicit pilots for the transmission of multicast and broadcast...
Provided by Instituto de Telecomunicacoes
-
White Papers
Iterative Decoding and Channel Estimation of MIMO-OFDM Transmissions With Hierarchical Constellations and Implict Pilots
January 1, 2012, 12:00am PST
It is widely recognized that OFDM modulations (Orthogonal Frequency Division Multiplexing) are suitable for broadband wireless systems. For this reason they were selected for several digital...
Provided by Instituto de Telecomunicacoes
-
White Papers
C2POWER Approach for Power Saving in Multi-Standard Wireless Devices
July 15, 2010, 12:00am PDT
4G networks promise higher data rates and continuous connectivity to multi-standard mobile devices, but at the expense of higher power requirements. Energy is a critical resource for mobile...
Provided by Instituto de Telecomunicacoes
-
White Papers
A Novel Relay Selection Game in Cooperative Wireless Networks Based on Combinatorial Optimization
February 18, 2011, 12:00am PST
Multi-standard mobile devices are allowing users to experience higher data rates and ubiquitous connectivity. These advances are achieved on the expense of higher energy consumption due to the...
Provided by Instituto de Telecomunicacoes
-
White Papers
FEBER: Feedback Based Erasure Recovery for Real-Time Multicast Over 802.11 Networks
September 6, 2011, 12:00am PDT
The authors consider the problem of broadcasting data streams over a wireless network for multiple receivers with reliability and timely delivery guarantees. In their framework, they consider...
Provided by Instituto de Telecomunicacoes
-
White Papers
Estimation of the Feedback Reliability for IB-DFE Receivers
June 6, 2011, 12:00am PDT
Single-Carrier (SC) modulation with Frequency-Domain Equalization (FDE) combined with iterative (turbo) FDE schemes has been shown to be suitable for Cyclic-Prefix (CP)-assisted block transmission...
Provided by Instituto de Telecomunicacoes
-
White Papers
Design and Planning of IEEE 802.16 Networks
October 2, 2007, 12:00am PDT
This paper presents aspects of design of WiMAX (World Interoperability for Microwave Access) wireless point-to-point, PTP, networks. The objective is to connect the Health Science Faculty of the...
Provided by Instituto de Telecomunicacoes
-
White Papers
Cost/Revenue Optimisation of Multi-Service Cellular Planning for Business Centre Enhanced
October 2, 2007, 12:00am PDT
Enhanced UMTS, E-UMTS, is a UMTS evolution step which provides bit rates higher than 2 Mbit/s in the uplink and downlink directions over a 5 MHz frequency carrier. It enables the provision of new...
Provided by Instituto de Telecomunicacoes
-
White Papers
Simulation of IEEE 802.11e in the Context of Interoperability
October 2, 2007, 12:00am PDT
This paper provides the specification of a MAC layer simulator that evaluates the service quality in WiFi, and presents initial results as a stand-alone simulator. The simulator will account for...
Provided by Instituto de Telecomunicacoes
-
White Papers
Converged Wireless Networking and Optimization for Next Generation Services
June 6, 2010, 12:00am PDT
The Next Generation Network (NGN) vision is tending towards the convergence of internet and mobile services providing the impetus for new market opportunities in combining the appealing services...
Provided by Instituto de Telecomunicacoes
-
White Papers
Design and Optimization Next-Generation All-Optical Passive Networks
November 15, 2009, 12:00am PST
This paper describes the progress of the work plan named "Design and Optimization Next Generation Passive All-Optical Networks". The first part of this report focuses on summarizing the status of...
Provided by Instituto de Telecomunicacoes
-
White Papers
Comparison Between UMTS/HSPA+ and WiMAX/IEEE 802.16e in Mobility Scenarios
January 26, 2009, 12:00am PST
The main purpose of this paper is to compare the performance of UMTS/HSPA+ and mWiMAX. Two scenarios were considered: single and multiple users. The single user model estimates the cell radius for...
Provided by Instituto de Telecomunicacoes
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