Beware of COBRA

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Technische Universität Dresden
Beware of COBRA ! COmputer Based Radio and
Antennas
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Demonstrating future concepts of wireless
communications !
Software Radio Smart Antennas Implementation Vo
dafone Chair

• Software Defined Radio
• Smart Antenna Concepts
• Implementation
• The Vodafone Chair

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High Diversity of Communications Systems !

• Software Radio
• Motivation
• Idea
• Demonstrator
• Concept
• Hardware
• Smart Antennas
• Implementation
• Vodafone Chair

Mobility
high
pedestrian
indoor
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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

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Demonstrator Concept

• Software Radio
• Motivation
• Idea
• Demonstrator
• Concept
• Hardware
• Smart Antennas
• Implementation
• Vodafone Chair

Antennas
RF-Components
Receiver
Transmitter
Signal Processing
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Demonstrator Hardware - Signal Processing
Host System Single Board Computer (Pentium 800
MHz, WinNT) Sampling ICS660 D/A board 14
bit, sampling_at_ 7.68 MHz ICS652 A/D boards with
DDC (GC1012A), 12 bit, sampling_at_
61.44 MHz Signal Processing (VantageRT
7400) G4 (MPC7400) based compute environments
which are connected by a Raceway network
including crossbars on the PCILK Parameters
Intermediate Frequency 15.36 MHz
Bandwidth 5 MHz

• Software Radio
• Motivation
• Idea
• Demonstrator
• Concept
• Hardware
• Smart Antennas
• Implementation
• Vodafone Chair

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Demonstrator Hardware - RF-Frontend
Frequency Range 5.21 GHz, 5.23 GHz
(HiperLAN/2) 5.85 GHz, 5.87 GHz
(ISM) Stability ? f / f 0.5
ppm Transmitter Bandwidth 5 MHz Gain Control
0 31 dB in steps of 1 dB Output Power
TX 21 dBm Output Noise Density -90
dBm/Hz Receiver Output Frequency (IF) 15.36
MHz Bandwidth 5 MHz Gain Control 0 63 dB
in steps of 1 dB Input Level Range -90 -30
dBm Noise Figure lt 4 dB Image Suppressing gt
50 dB

• Software Radio
• Motivation
• Idea
• Demonstrator
• Concept
• Hardware
• Smart Antennas
• Implementation
• Vodafone Chair

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Demonstrator Hardware - Antenna System
8 antennas for 5.2 GHz (omni and polarized) 8
antennas for 5.8 GHz (omni and polarized) 2
flexible stands Flexible configurations Up to
4X4 MIMO system Polarization diversity HiperLA
N/2 and ISM-band Different antenna distances

• Software Radio
• Motivation
• Idea
• Demonstrator
• Concept
• Hardware
• Smart Antennas
• Implementation
• Vodafone Chair

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Smart Antennas - State of the Art

• Software Radio
• Smart Antennas
• State of Art
• Theory
• MIMO
• Systems
• Demonstrator
• Features
• Implementation
• Vodafone Chair

TX-Diversity at BS
Sectorized Antennas
Beamforming at BS
Space-Time Coding
GSM,UMTS
WLAN, UMTS
GSM,UMTS
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Theory of Multi Antenna Systems (MIMO)

• Software Radio
• Smart Antennas
• State of Art
• Theory
• MIMO
• Systems
• Demonstrator
• Features
• Implementation
• Vodafone Chair

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MIMO-Systems

• Software Radio
• Smart Antennas
• State of Art
• Theory
• MIMO
• Systems
• Demonstrator
• Features
• Implementation
• Vodafone Chair

Receiver
Transmitter
Space-Time-Coding One data stream over multiple
TX-antennas (robustness)
V-BLAST One data stream for each
antenna (high-data rate)
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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-Time-Algorithms
• General Software Radio Framework including GUIs
  

• Software Radio
• Smart Antennas
• State of Art
• Theory
• MIMO
• Systems
• Demonstrator
• Features
• Implementation
• Vodafone Chair

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PHY-Implementation - Transmitter

• Software Radio
• Smart Antennas
• Implementation
• Transmitter
• Receiver
• Vodafone Chair

Channel 2 (DCH 34)
Channel 3 (DCH 56)
Channel 1 (DCH 12)
Pilot (CCH )
Channel 1 (DCH 12)
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Scalable Transmitter Setup
PPC 7400

• Software Radio
• Smart Antennas
• Implementation
• Transmitter
• Receiver
• Vodafone Chair

UMTS Spreading
GUI
Data Source
RRC Filter
RRC Filter
Host PC
PPC 7400
D/A Converter
ICS 660
To RF and antennas
Lowpass
Lowpass
Sampling rate 7.68 MHz Frequency Output
Baseband Bandwidth 4.68 MHz
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Scalable Receiver Setup

• Software Radio
• Smart Antennas
• Implementation
• Transmitter
• Receiver
• Vodafone Chair

ICS 660
PPC 7400
From RF and antennas
ICS 660
PPC 7400
RRC Filter
Demod
Lowpass
A/D
Host
PPC 7400
Frequency Sync.
GUI
Time Sync.
3-Finger-Space-Time RAKE-Despreader
Antenna Combiner
Sampling rate 61.44 MHz (16x
chiprate) Frequency Input 15.36 MHz (IF 4x
chiprate) Bandwidth 4.68 MHz
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RAKE-Functionality
from RRC-Filter

• Software Radio
• Smart Antennas
• Implementation
• Transmitter
• Receiver
• Vodafone Chair

RAKE-Finger 1
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Early Despread Pilot
DOT PLL
Late Despread Pilot
On Time Despread Pilot
On Time Despread Data
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Data symbols estimates
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Project Sponsors

• COBRA demonstrator is part of the
• Project

• Software Radio
• Smart Antennas
• Implementation
• Transmitter
• Receiver
• Sponsors
• Vodafone Chair

We would like to thank the following sponsors
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The - Chair and
its Partners
Project Partners
Sponsors

• 1 professor
• 3 secretaries
• 4 sen. scientists
• system adm.
• 2 post-docs
• 20 Ph.D. students
• 15 Ms students

• Software Radio
• Smart Antennas
• Implementation
• Vodafone Chair
• Sponsors
• Research
• IPP
• Spin-Offs

New since 2002
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Research Topics

• Radio Networks

• Software Radio
• Smart Antennas
• Implementation
• Vodafone Chair
• Sponsors
• Research
• IPP
• Spin-Offs

Network Operator

• Radio Modems

Equipment Manufacturer

• DSP HardwareTools

Semiconductor Vendor
Physical Layer Research
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Industry Partner Program (IPP)

• This sponsoring program provides an opportunity
  for companies
• 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.

• Software Radio
• Smart Antennas
• Implementation
• Vodafone Chair
• Sponsors
• Research
• IPP
• Spin-Offs

IPP-Event on October 15, 2003
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• Software Radio
• Smart Antennas
• Implementation
• Vodafone Chair
• Sponsors
• Research
• IPP
• Spin-Offs

• 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

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Mission
Network Planning

• Software Radio
• Smart Antennas
• Implementation
• Vodafone Chair
• Sponsors
• Research
• IPP
• Spin-Offs

Radioplan provides the technical essentials
necessary to efficiently and effectively plan,
build, and run mobile radio networks www.radiopla
n.de (Founded in 2000)
Network Engineering
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Technische Universität Dresden

• Implementation
• Transmitter
• Receiver
• Project Sponsors
• Vodafone Chair
• Sponsors
• Research
• IPP
• Spin-Offs

• Software Radio
• Motivation
• Idea
• Demonstrator Concept
• Hardware
• Smart Antennas
• State of Art
• Theory
• MIMO Systems
• Demonstrator Features