Newcom Department 3 İstanbul Meeting 6 September 2004

1. Newcom Department 3İstanbul Meeting6 September 2004 Işık University, İstanbul

2. 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

3. 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

4. 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”

5. 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)

6. Overview and status of WPR3 activities (cont.) • A mail reflector is formed: wpr3@lists.bilkent.edu.tr • A web page is prepared: www.ee.bilkent.edu.tr/~newcomd3 (contains the presentations of kickoff meeting)

8. 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++

10. Overview and status of WPR3 activities (cont.) • 2 partners (Supelec and PUT) are not participating)

11. Discussion on future actions/activities to make WP3 successful

12. Discussion on future actions/activities to make WP3 successful • Our success will be measured by the Degree of integration

13. 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

14. 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

15. 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?

16. 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)

17. 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)

18. NEWCOM WPR3 Workshop

19. Nonlinearity of power amplifiers • Nonlinearity? • At the inputf1 • At the output (f1) (2f1) (3f1) (4f1)….(nf1) • Relatively easy to filter if system bandwidth is not too big.

20. 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

21. Nonlinearity of power amplifiers • IM3 Example: • f1 + f2 : 2420 MHz + 2430 MHz • 2f1 - f2 : 2410 MHz • 2f2 - f1 : 2440 MHz

22. 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

23. Linearization techniques • Feedforward Linearization • Cartesian Feedback • RF Predistortion • Digital Predistortion

24. 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

25. 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

26. Giovanni Ghione • Professor of Politecnico di Torino • Book: Noise in semiconductor devices: Modeling and simulation • Nonlinearity characterization and modeling

27. it++ Presentation • Thomas Eriksson of Chalmers University of Technology, Göteborg

28. Integrated antennas • Erik Öjefors of University of Uppsala

29. Impedance matching and modeling using real frequency techniques • Sıddık Yarman of Işık University