powerpoint presentation

V o d a f o n e C h a i rMobile Communications Systems

Beware of COBRA !Beware of COBRA !

COmputer Based Radio and Antennas

TechnischeUniversitätDresden


V o d a f o n e C h a i rMobile Communications System

Software Defined RadioSmart Antenna ConceptsImplementationThe Vodafone Chair

Software Radio

Smart Antennas

Implementation

Vodafone Chair

Demonstrating future concepts of Demonstrating future concepts of wireless communications !wireless communications !



High Diversity of Communications Systems !High Diversity of Communications Systems !

Mobility

indoor

pedestrian

high

D

AB

DV

B -T

UMTS

G

SM

GPRS EDGE

DECT

10 100 1000 10000 100000 kBit/s

Blue ToothWLAN

Data rate

Software Radio

• Motivation • Idea• Demonstrator Concept• Hardware

Smart Antennas

Implementation

Vodafone Chair



Software Defined Radio - IdeaSoftware Defined Radio - Idea

Software Radio


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



Demonstrator Concept Demonstrator Concept

AntennasAntennas

SignalSignalProcessingProcessing

RF-ComponentsRF-Components

TransmitterTransmitter

ReceiverReceiver

Software Radio


Smart Antennas

Implementation

Vodafone Chair



Software Radio


Smart Antennas

Implementation

Vodafone Chair

Host System:Single Board Computer (Pentium 800 MHz, WinNT)

Sampling :ICS660 D/A board 14 bit, sampling@ 7.68 MHzICS652 A/D boards with DDC (GC1012A), 12 bit,

sampling@ 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

Demonstrator Hardware - Signal ProcessingDemonstrator Hardware - Signal Processing



Demonstrator Hardware - RF-FrontendDemonstrator 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

TransmitterTransmitterBandwidth: 5 MHz Gain Control: 0 … 31 dB in steps of 1 dBOutput Power TX: 21 dBmOutput Noise Density: -90 dBm/Hz

ReceiverReceiverOutput Frequency (IF): 15.36 MHzBandwidth: 5 MHz Gain Control: 0 … 63 dB in steps of 1 dBInput Level Range: -90 … -30 dBmNoise Figure: < 4 dBImage Suppressing: > 50 dB

Software Radio


Smart Antennas

Implementation

Vodafone Chair



8 antennas for 5.2 GHz (omni and polarized)

8 antennas for 5.8 GHz (omni and polarized)

2 flexible standsFlexible configurations:

Up to 4X4 MIMO systemPolarization diversityHiperLAN/2 and ISM-band Different antenna distances

Software Radio


Smart Antennas

Implementation

Vodafone Chair

Demonstrator Hardware - Antenna SystemDemonstrator Hardware - Antenna System



Smart Antennas - State of the ArtSmart Antennas - State of the Art

Sectorized Antennas

Beamforming at BS

Space-Space-Time Time

CodingCoding

TX-Diversity at BS

GSM,UMTS GSM,UMTS WLAN, UMTS

Software Radio

Smart Antennas• State of Art• Theory• MIMO Systems• Demonstrator Features

Implementation

Vodafone Chair



Theory of Multi Antenna Systems (MIMOTheory of Multi Antenna Systems (MIMO))

Signal to Noise Ratio [dB]

Thro

ughp

ut [

bit/s

/Hz]

0 5 10 15 20 25 300

5

10

15

20

25

30

6 times more bits over a radio 6 times more bits over a radio channel @ SNR of 20 dB !channel @ SNR of 20 dB !

Software Radio


Implementation

Vodafone Chair



MIMO-SystemsMIMO-Systems

Space-Time-CodingSpace-Time-CodingOne data stream over multiple TX-antennas

(robustness)

V-BLASTV-BLASTOne data stream for

each antenna(high-data rate)

Transmitt

er

Receiver

D-BLAST,D-BLAST,Multi-Stratum-Space-Time-CodesMulti-Stratum-Space-Time-Codes

Multiple Data Streams over all antennas

(high data rate & robustness)

Software Radio


Implementation

Vodafone Chair



Demonstrator FeaturesDemonstrator Features

Direct Sequence Spread Spectrum System Compliant with UMTS-Uplink Physical Layer implemented Includes true synchronizationUsage of multiple antennas (currently 2 x 2)

Achievements:Space-Time-Channel measurementsPerformance Evaluation Space-Time-AlgorithmsGeneral Software Radio Framework including GUI’s

Software Radio


Implementation

Vodafone Chair



PHY-ImplementationPHY-Implementation - Transmitter - Transmitter

SpreadingCode N

GainN

Space-TimeCode

SFN

to antenna 1

to antenna 2

Channel 2 (DCH 3&4)

Channel 3(DCH 5&6)

Channel 1 (DCH 1&2)

Pilot (CCH )

Channel 1 (DCH 1&2)

Software Radio

Smart Antennas

Implementation• Transmitter• Receiver

Vodafone Chair



Scalable Transmitter SetupScalable Transmitter Setup

Sampling rate: 7.68 MHzFrequency Output: BasebandBandwidth: 4.68 MHz

RRC Filter

RRC Filter

Lowpass

Lowpass IQ-Mod

Host PCHost PC

ICS 660ICS 660 To RF and antennas

D/A Converter

PPC 7400PPC 7400UMTS

Spreading

PPC 7400PPC 7400

Data Source

GUI Software Radio

Smart Antennas


Vodafone Chair



ScalableScalable Receiver Setup Receiver Setup

From RF and

antennas

PPC 7400PPC 7400ICS 660ICS 660

RRC Filter

PPC 7400PPC 7400

Lowpass

ICS 660ICS 660

Demod A/D

PPC 7400PPC 7400 Frequency Sync.

Time Sync.

3-Finger-Space-TimeRAKE-Despreader

HostHost

Antenna Combiner

GUI

Sampling rate: 61.44 MHz (16x chiprate)Frequency Input: 15.36 MHz (IF = 4x chiprate)Bandwidth: 4.68 MHz

Software Radio

Smart Antennas


Vodafone Chair



Space-TimeDecoding

ST-Decoding

ST-Decoding

Σ

MaximumRatioCombining

RAKE-FunctionalityRAKE-Functionality

Early Despread Pilot

Late Despread Pilot

On Time Despread Pilot

DOTPLL

∆

On Time Despread Data

RAKE-Finger 1RAKE-Finger 1

Channel Coefficients

DataSymbols

Data symbols estimates

from RRC-Filter

RA

KE-

Fing

er 2

RA

KE-

Fing

er 2

RA

KE-

Fing

er 3

RA

KE-

Fing

er 3

Software Radio

Smart Antennas


Vodafone Chair



Project SponsorsProject Sponsors

COBRA demonstrator is part of the

Project Project

We would like to thank the following sponsors:

Software Radio

Smart Antennas

Implementation• Transmitter• Receiver• Sponsors

Vodafone Chair



The - Chair and its PartnersThe - Chair and its Partners

1 professor3 secretaries4 sen. scientists2 system adm.2 post-doc’s20 Ph.D. students15+ Ms students

SponsorsProject Partners

New since 2002

Software Radio

Smart Antennas

Implementation

Vodafone Chair• Sponsors• Research• IPP• Spin-Off‘s



Research TopicsResearch Topics

EquipmentManufacturer

SemiconductorVendor

NetworkOperator

Physical Layer ResearchPhysical Layer Research

Software Radio

Smart Antennas

Implementation




Industry Partner Program (IPP)Industry Partner Program (IPP)

This sponsoring program provides an opportunity for This sponsoring program provides an opportunity for companiescompanies

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 receiveAs 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, 2003IPP-Event on October 15, 2003

Software Radio

Smart Antennas

Implementation




• 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

Software Radio

Smart Antennas

Implementation




Network Planning

NetworkEngineering

Radioplan provides the technical essentials necessary to efficiently and effectively plan, build, and run

mobile radio networks

www.radioplan.de

(Founded in 2000)

MissionMission

Software Radio

Smart Antennas

Implementation


http://www.radioplan.de/

V o d a f o n e C h a i rMobile Communications Systems

• Software Radio–Motivation –Idea–Demonstrator Concept–Hardware

• Smart Antennas–State of Art–Theory–MIMO Systems–Demonstrator Features

• Implementation–Transmitter–Receiver–Project Sponsors

• Vodafone Chair–Sponsors–Research–IPP–Spin-Off‘s


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