PRIN2008 – WORLD
Kick-off Meeting
University of Florence
Research Unit
17/10/2008
Laboratorio di Reti di Telecomunicazioni
Rome, Italy
1
DET Dipartimento Elettronica e Telecomunicazioni
Research Group
•
•
•
•
•
•
•
Romano Fantacci
Francesco Chiti
Dania Marabissi
Leonardo Maccari
Simone Menci
Lorenzo Niccolai
Luca Adamo
17/10/2008
Laboratorio di Reti di Telecomunicazioni
Rome, Italy
2
DET Dipartimento Elettronica e Telecomunicazioni
Research Activity
• WP1 - The WORLD System Architecture
– T1.1 WORLD User requirements and QoS-constraints
for Multimedia Applications
– T1.2 WORLD System Definition
– T1.3 WORLD System Refinements
• WP2 - Multi-Antenna UWB/OFDM/MCCDMA
Active Radios based on opportunistic
approaches
– T2.3 Opportunistic mode selection for seamless
mode-switching
17/10/2008
Laboratorio di Reti di Telecomunicazioni
Rome, Italy
3
DET Dipartimento Elettronica e Telecomunicazioni
Research Activity
• WP 3 - Active MAC mechanisms and protocols
for supporting multimedia flows
– T3.1 Performance Modeling and Analysis of MAC
Layer for Wireless Multimedia links
– T3.3 Channel-aware and Link-adaptive MIMO hybrid
ARQ for QoS-constrained multimedia flows
• WP4 - Network and Transport for active LANs
with multiple QoS-Requirements
– T4.4 Competitive routing supporting QoS
17/10/2008
Laboratorio di Reti di Telecomunicazioni
Rome, Italy
4
DET Dipartimento Elettronica e Telecomunicazioni
Research Activity
• WP6 - Multimedia Applications and secure Endto-End QoS-provisioning
– T6.4 Multimedia peer-to-peer (P2P) WLAN
connections
– T6.6 Secure protocols for multi-hop wireless access
networks with Mobile Access Points
17/10/2008
Laboratorio di Reti di Telecomunicazioni
Rome, Italy
5
DET Dipartimento Elettronica e Telecomunicazioni
WP1
•
•
•
•
Heterogeneous network interworking
Allow the interoperability with the existing
networks
Increment the WiMAX coverage in indoor
environment
Based on standardized network to allow
users and operator interoperability
Allow a soft-handoff in order to achieve a
total coverage
17/10/2008
Laboratorio di Reti di Telecomunicazioni
Rome, Italy
6
DET Dipartimento Elettronica e Telecomunicazioni
WP1
Envisioned system architecture providing interoperability among nonoverlapping WSNs through mesh based WiMAX backhaul, as well as supporting
mobile data mule
17/10/2008
Laboratorio di Reti di Telecomunicazioni
Rome, Italy
7
DET Dipartimento Elettronica e Telecomunicazioni
WP2
Multiple antennas
• Within BWA systems are introduced the Multiple Input
Multiple Output (MIMO) and Adaptive Antenna Systems (AAS)
AAS
techniques.Correlated signal
MIMO
Combining
Uncorrelated signal
w*1
w*2
Receiver
w*
M
Channel diversity (STC)
Signal Processing
Channel
estimation
Exploiting the combination of signal from
different sensors, AAS systems permit to
enhance the signal to interference plus
noise ratio (SINR).
17/10/2008
22/12/2015
Laboratorio di Reti di Telecomunicazioni
Rome, Italy
Spatial Multiplexing
8
DET Dipartimento Elettronica e Telecomunicazioni
WP2
Diversity schemes
• Performance analysis of fixed connections with multiple
antennas at BS rely on the following schemes:
– Downlink: Maximum Ratio Combining
– Uplink: Alamouti (with Space-Time e Space-Frequency Coding)
• Further developments:
– Generalization to MIMO systems
– Taking into account cooperative schemes (mesh networks/soft
handover)
R
S
17/10/2008
Laboratorio di Reti di Telecomunicazioni
Rome, Italy
D
9
DET Dipartimento Elettronica e Telecomunicazioni
WP3
• Hybrid ARQ (H-ARQ) techniques:
– combined use of FEC and ARQ techniques
• Type I: when the two technique are used jointly
• Type II: when the two techniques are optimized jointly
• Type III: when the two techniques are adaptively optimized
17/10/2008
Laboratorio di Reti di Telecomunicazioni
Rome, Italy
10
DET Dipartimento Elettronica e Telecomunicazioni
WP3
• Soft Output Combining H-ARQ
– The last packet replica is recombined with a soft metric at the
output of the decoder, maximizing the Euclidean distance
between codeword;
– Effective for SISO decoder (turbo codes)
– The recombination schemes can use a diversity technique:
• Maximum Ratio Combining (MRC);
• Equal Gain Combining (EGC);
• Weighted Gain Combining (WGC).
– Both spatial diversity and decoding gain are to be addressed
17/10/2008
Laboratorio di Reti di Telecomunicazioni
Rome, Italy
11
DET Dipartimento Elettronica e Telecomunicazioni
WP4
• Network coding (digital fountain codes)
– Create multicast layers (usually two):
• progressively better resolution on images
• Differentiated traffic flows
– If packet loss rate is low enough, then receiver can
reconstruct source data before receiving any
duplicate packets
– Inner/Outer codes design
– Adaptive encoding/decoding processes
– Equal vs Unequal error protection schemes
– Equal vs Unequal recovery time schemes
17/10/2008
Laboratorio di Reti di Telecomunicazioni
Rome, Italy
12
DET Dipartimento Elettronica e Telecomunicazioni
WP6
• PROFILE PRIN
• Design of multimedia stream delivery protocols:
– Making the network nodes and user’s terminals
aware of the P2P networks
– Improving the user’s QoS
– incorporating a P2P layer into the WORLD network
design in order to support multimedia
communications among nodes.
• “embedded” P2P network available for multimedia delivery
content.
• P2P system is able to resort to all the network parameters
(bandwidth, jitter, delay, etc.)
17/10/2008
Laboratorio di Reti di Telecomunicazioni
Rome, Italy
13
DET Dipartimento Elettronica e Telecomunicazioni