Technische
Universität
Dresden
Beware of COBRA !
COmputer Based Radio and Antennas
Vodafone Chair
Mobile Communications Systems
Technische
Universität
Dresden
Software Radio
Smart Antennas
Implementation
Vodafone Chair

Demonstrating future concepts of
wireless communications !
Software Defined Radio
Smart Antenna Concepts
Implementation
The Vodafone Chair
Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
High Diversity of Communications Systems !
Software Radio
high
Smart Antennas
pedestrian
Implementation
GPRS
EDGE
DVB -T
DAB
Mobility
GSM
• Motivation
• Idea
• Demonstrator
Concept
• Hardware
UMTS
Vodafone Chair
DECT
indoor
Blue Tooth
10

WLAN
100
Data rate
1000 10000 100000 kBit/s
Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
Software Defined Radio - Idea
Software Radio
• Motivation
• Idea
• Demonstrator
Concept
• Hardware
Smart Antennas
Implementation
Vodafone Chair

Do as much signal processing as you
can afford in software and you can
use the same hardware for different
communications systems
simple download system updates and
new features
Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
Demonstrator Concept
Software Radio
• Motivation
• Idea
• Demonstrator
Concept
• Hardware
Antennas
RF-Components
Receiver
Transmitter
Smart Antennas
Implementation
Vodafone Chair
Signal
Processing

Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
Software Radio
Smart Antennas
• State of Art
• Theory
• MIMO
Systems
• Demonstrator
Features
Smart Antennas - State of the Art
Sectorized
Antennas
Beamforming
at BS
TX-Diversity
at BS
SpaceTime
Coding
Implementation
Vodafone Chair
GSM,UMTS

GSM,UMTS
WLAN, UMTS
Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
Theory of Multi Antenna Systems (MIMO)
30
Smart Antennas
• State of Art
• Theory
• MIMO
Systems
• Demonstrator
Features
Implementation
Vodafone Chair
Throughput [bit/s/Hz]
Software Radio
25
20
15
10
5
0
0
5
10
15
20
25
30
Signal to Noise Ratio [dB]
6 times more bits over a radio
channel @ SNR of 20 dB !

Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
Implementation
Space-Time-Coding
One data stream over
multiple TX-antennas
(robustness)
Vodafone Chair
V-BLAST
One data stream for
each antenna
(high-data rate)

Receiver
Smart Antennas
• State of Art
• Theory
• MIMO
Systems
• Demonstrator
Features
Transmitter
Software Radio
MIMO-Systems
D-BLAST,
Multi-Stratum-Space-Time-Codes
Multiple Data Streams over all
antennas
(high data rate & robustness)
Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
Software Radio
Smart Antennas
• State of Art
• Theory
• MIMO
Systems
• Demonstrator
Features
Implementation
Vodafone Chair

Demonstrator Features
Direct Sequence Spread Spectrum System
Compliant with UMTS-Uplink
Physical Layer implemented
Includes true synchronization
Usage of multiple antennas (currently 2 x 2)
Achievements:
Space-Time-Channel measurements
Performance Evaluation Space-TimeAlgorithms
General Software Radio Framework including
GUI’s
Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
Software Radio
Smart Antennas
Implementation
• Transmitter
• Receiver
Vodafone Chair
Scalable Transmitter Setup
PPC 7400
RRCRRC
FilterFilter
D/A
Converter
Lowpass
Sampling rate:
Frequency Output:
Bandwidth:
GUI
Host PC
PPC 7400
Lowpass

Data
Source
UMTS
Spreading
ICS 660
IQ-Mod
7.68 MHz
Baseband
4.68 MHz
To RF and
antennas
Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
Scalable Receiver Setup
Software Radio
Smart Antennas
Implementation
• Transmitter
• Receiver
Vodafone Chair

From RF
and
antennas
ICS 660
ICS 660
A/D
PPC 7400
PPC 7400
Demod
Lowpass
Host
GUI
Frequency
Sync.
Antenna
Combiner
3-Finger-Space-Time
RAKE-Despreader
Sampling rate:
Frequency Input:
Bandwidth:
RRC
Filter
PPC 7400
Time
Sync.
61.44 MHz (16x chiprate)
15.36 MHz (IF = 4x chiprate)
4.68 MHz
Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
Software Radio
Smart Antennas
Implementation
• Transmitter
• Receiver
• Sponsors
Vodafone Chair

Project Sponsors
COBRA demonstrator is part of the
Project
We would like to thank the
following sponsors:
Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
Software Radio
Smart Antennas
Implementation
Vodafone Chair
• Sponsors
• Research
• IPP
• Spin-Off‘s

The
1
3
4
2
2
20
15+
professor
secretaries
sen. scientists
system adm.
post-doc’s
Ph.D. students
Ms students
- Chair and its Partners
Project Partners
Sponsors
New since 2002
Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
Research Topics
Software Radio
Smart Antennas
Network
Operator
Implementation
Vodafone Chair
• Sponsors
• Research
• IPP
• Spin-Off‘s
Equipment
Manufacturer
Semiconductor
Vendor
Physical Layer Research

Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
Industry Partner Program (IPP)
This sponsoring program provides an opportunity for
companies
Software Radio
Smart Antennas
Implementation
Vodafone Chair
• Sponsors
• Research
• IPP
• Spin-Off‘s
to support our research activities,
to enhance teaching,
to get in touch with our researchers and students.
As a thank you our IPP members will receive
our quarterly newsletter "Dresden Mobile"
copies of MS-diploma theses and student project reports
copies of our publications and pre-prints
an invitation to our annual IPP event.
The IPP membership therefore provides a platform to keep close
contact with our chair.
IPP-Event on October 15, 2003

Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
Software Radio
Smart Antennas
Implementation
Vodafone Chair
• Sponsors
• Research
• IPP
• Spin-Off‘s

• Founded 1999
• Based in San Jose and Dresden with
a RF design center in Maynard,
Massachusetts
• Investors include Apax, Atlas, Lehman
Brothers and Sony
• 60 Mb/s Wireless LAN Chip
(IEEE 802.11a/b) released in 2002
• 2002 Philips Semiconductors has
acquired Systemonic
Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
Software Radio
Mission
Network
Planning
Smart Antennas
Implementation
Vodafone Chair
• Sponsors
• Research
• IPP
• Spin-Off‘s
Radioplan provides the technical
essentials necessary to efficiently and
Network plan, build, and run mobile
effectively
Engineering radio networks
www.radioplan.de
(Founded in 2000)

Vodafone Chair
Mobile Communications System
Technische
Universität
Dresden
• Software Radio
• Implementation
– Motivation
– Idea
– Demonstrator Concept
– Hardware
• Smart Antennas
– Transmitter
– Receiver
– Project Sponsors
• Vodafone Chair
– State of Art
– Theory
– MIMO Systems
– Demonstrator Features
– Sponsors
– Research
– IPP
– Spin-Off‘s
Vodafone Chair
Mobile Communications Systems