![Page 1: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/1.jpg)
Newcom Department 3İstanbul Meeting
6 September 2004
Işık University, İstanbul
![Page 2: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/2.jpg)
Participating Partners
• POLITO (Giovanni Ghione)
• Chalmers (Thomas Eriksson)
• UU (Erik Öjefors)
• ISIK (Ahmet Aksen, Sıddık Yarman)
• Bilkent (Abdullah Atalar, Tarık Reyhan)
Excused: CTTC, TUI and UoP
![Page 3: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/3.jpg)
Meeting Agenda• Welcome, agreement on agenda• Overview and status of WPR3 activities• Discussion on Deliverable DR1• Discussion on future actions/activities to make
WP3 successful• Workshop:
– Lecture by Giovanni Ghione on “Nonlinearity characterization and modeling”
– Lunch
![Page 4: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/4.jpg)
Meeting Agenda (cont.)
• Workshop continued:– Lecture by Thomas Eriksson on “it++”– Tea/coffee break– Lecture by Erik Öjefors on “Integrated
antennas”– Tea/coffee break– Lecture by Sıddık Yarman on “Impedance
matching and modeling using real frequency techniques”
![Page 5: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/5.jpg)
Overview and status of WPR3 activities
• Kickoff meeting of Leuven, 18 June 2004• Eight partners participated and made
presentations to describe their research areas• 4 clusters formed:
– Nonlinearity of power amplifiers (Chalmers, POLITO, Bilkent, UoP, ISIK, CTTC)
– Antennas (UU, TUI, CTTC, ISIK)– Phase Noise (Bilkent, Chalmers, POLITO)– RFIC Front ends (UoP, UU, TUI)
![Page 6: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/6.jpg)
Overview and status of WPR3 activities (cont.)
• A mail reflector is formed: [email protected]
• A web page is prepared: www.ee.bilkent.edu.tr/~newcomd3 (contains the presentations of kickoff meeting)
![Page 7: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/7.jpg)
![Page 8: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/8.jpg)
Overview and status of WPR3 activities (cont.)
• it++ developed by Chalmers can be a common ground (GNU License)– This afternoon Thomas Eriksson of Chalmers will
make a presentation on it++
![Page 9: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/9.jpg)
![Page 10: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/10.jpg)
Overview and status of WPR3 activities (cont.)
• 2 partners (Supelec and PUT) are not participating)
![Page 11: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/11.jpg)
Discussion on future actions/activities to make WP3
successful
![Page 12: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/12.jpg)
Discussion on future actions/activities to make WP3
successful
• Our success will be measured by the Degree of integration
![Page 13: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/13.jpg)
Discussion (cont.)
• Degree of integration is measured by– Number of PhD students in training
activities– Number of PhD students in exchange
programs– Number of people in NEWCOM workshops– Number of jointly submitted papers– Number of jointly supervised PhD students
![Page 14: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/14.jpg)
Discussion (cont.)• Degree of integration is measured by
– Number of commonly evaluated PhD theses– Number of joint patents– Number of partners providing shared
equipment– Number of other students participating in
exchange
![Page 15: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/15.jpg)
PhD Student Exchange
• Housing cost is provided by NEWCOM• Which partners can accept students?• Which partners can provide students?• For how long? • Difficulty of sending a student to
another place (is it just a lost time for the sending institution?)
• Is language a problem?
![Page 16: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/16.jpg)
Deliverable DR1
• DR1 date is delayed by 1.5 months• To be prepared:
– Related publications with abstracts– Related patents– Completed/ongoing projects– Available measuring equipment,
design/analysis software– Courses given on related areas (with
detailed syllabus, language of instruction)
![Page 17: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/17.jpg)
Deliverable DR1 (cont.)
– Required know-how to complete WPR3 objectives
– Identification of gaps among WPR3 participants (needs to be done through four clusters)
– Detailed plan for encountering gaps (needs to be done through four clusters)
• So far 3 partners provided the contributions (TUI, UU, ISIK)
![Page 18: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/18.jpg)
NEWCOM WPR3 Workshop
![Page 19: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/19.jpg)
Nonlinearity of power amplifiers
• Nonlinearity?– At the input f1
– At the output (f1) (2f1) (3f1) (4f1) ….(nf1)
– Relatively easy to filter if system bandwidth is not too big.
![Page 20: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/20.jpg)
Nonlinearity of power amplifiers
• Why is it important?– Modern communication systems use
multicarriers.
– At the input: f1 + f2
– At the output: (mf1 + nf2) (m+n th order)
– Among them most troublesome: 3rd order (IM3)2f1 - f2 or 2f2 - f1
![Page 21: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/21.jpg)
Nonlinearity of power amplifiers
• IM3 Example:– f1 + f2 : 2420 MHz + 2430 MHz
– 2f1 - f2 : 2410 MHz
– 2f2 - f1 : 2440 MHz
![Page 22: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/22.jpg)
Nonlinearity of power amplifiers
• Typical power amplifer operates in Class A or Class AB. (In Class AB amplifier’s DC current increases with increasing drive).
• What can be done to reduce nonlinearity?– Use the power amplifier at a lower signal level
or with a higher bias at the expense of reduced efficiency
– Use predistortion/linearization methods
![Page 23: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/23.jpg)
Linearization techniques
Feedforward Linearization Cartesian Feedback RF Predistortion Digital Predistortion
![Page 24: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/24.jpg)
Nonlinearity of power amplifiers
• Predistortion/cancellation methods are expensive or are not very efficient: Suitable for base stations
• For mobile systems efficiency is very important.
• Comprimise between efficiency and linearity: Bias as low as possible to increase efficiency, sufficiently high to reduce IM3
![Page 25: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/25.jpg)
Nonlinearity of power amplifiers
• State-of-the-art: What is done?– Each device is measured for allowable IM3 at
each channel– Input level and bias is adjusted to satisfy the
specs for highest efficiency– Input level and bias values are stored in a
lookup table that contains also temperature variations
![Page 26: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/26.jpg)
Giovanni Ghione
• Professor of Politecnico di Torino– Book: Noise in semiconductor devices:
Modeling and simulation
• Nonlinearity characterization and modeling
![Page 27: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/27.jpg)
it++ Presentation
• Thomas Eriksson of Chalmers University of Technology, Göteborg
![Page 28: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/28.jpg)
Integrated antennas
• Erik Öjefors of University of Uppsala
![Page 29: Newcom Department 3 İstanbul Meeting 6 September 2004](https://reader031.vdocuments.us/reader031/viewer/2022032708/56812af8550346895d8edf23/html5/thumbnails/29.jpg)
Impedance matching and modeling using real frequency
techniques
• Sıddık Yarman of Işık University