Background

The growing demand for high data-rates transmission in modern wireless communication systems has motivated the development of broadband wireless technologies to support increased channel capacity with good spectral efficiency. A distinct feature in such systems is carrier aggregation – a configuration in which two or more component carriers are aggregated on the physical layer to support wider transmission bandwidths for higher data throughput. In practice, aggregation of more than two carriers at the transmitter becomes increasingly challenging due to the unrealistically large number of coefficients required for a multi-dimensional predistortion based on standard memory polynomial schemes.

Project Proposal

The goal of this project is to develop a flexible al low complexity neural network based algorithm to simultaneously linearize several channels that are transmitted concurrently through a single power amplifier, taking into account inband and crossband intermodulation distortions. The algorithm should outperform state-of-the-art memory-polynomial based predistortion approaches in terms of sampling rate requirement, bandwidth and implementation complexity. The algorithm will be developed using actual nonlinear power amplifier models, and then evaluated in real lab experiments using a broadband Wi-Fi transmitter.

Requirements

• Good programming capabilities (knowledge in Python – advantage)
• Optimization/Learning courses – advantage

RFIC/Analog circuit design courses – advantage

Instructors

Nimrod Ginzberg   (nimrodg@tx.technion.ac.il)

רקע

הדור הבא של הטכנולוגיה לתקשורת אלחוטית, ה-5G, יעשה שימוש במקמ”ש מסוג Full-Duplex, שמאפשר לשדר ולקלוט סימולטנית סביב אותו התדר תוך ניצוב מקסימלי של רוחב הסרט שעומד לרשות המערכת. רכיב בסיסי במקמ”ש כזה הוא מסנן רב ערוצי (N-path filter), שמשמש לבניית מזיזי פאזה חד כיווניים החיוניים במימוש של מערכת Full-Duplex.

מטרת הפרויקט

תכנון של מסנן מעביר נמוכים בעל נקודת דחיסה גבוהה. התכנון כולל בחירת טופולוגיה מתאימה של מסנן (Butterworth, Chebichev, Elliptical וכד’), בחירת טופולוגיה של מגבר אקטיבי ומימוש המגבר בתכנת CAD (ADS, Virtuoso).

שלבי הפרוייקט

.1סקר ספרות

.2ניתוח טופולוגיות שונות של מסננים

.3ניתוח טופולוגיות שונות של מגברי שרת

.4בחירת טופולוגיות מתאימות ומימוש בתכנת CAD

.5סימולציות של המסנן בקונטקסט של מערכת התקשורת המלאה

משך הפרויקט: סמסטריאלי עם אפשרות לשנתי

מנחה: נמרוד גינזברג

Introduction

Lidar sensors provide high resolution and accuracy for diverse applications such as autonomous vehicles, 3D imagers, and line-of-sight telecommunications. A major challenge in the realization of small from-factor LIDARS is in implementing miniaturized Silicon-photonic waveguides for phase shifting and true time delay.

Project Scope

• Literature survey
• Delay/phase shift circuit design using Cadence Virtuoso and COMSOL
• Simulation and performance evaluation
• System-level design and simulation

Project Roadmap (two semesters)

Fabrication and lab measurements

Introduction

Modern wireless networks require high purity frequency sources to allow full duplex operation in which the transmitter and the receiver operate simultaneously.

Project Scope

Circuit-level design of a frequency synthesizer and tunable bandpass filter in advanced CMOS tech.

Project Roadmap (one semester)

1. Literature survey on
2. Frequency generation circuitry theory
3. Synthesizer circuit blocks design
4. Tunable filter design
5. System integration and performance evaluation

Project Roadmap (two semesters)

Fabrication and lab measurements

Introduction

Next-generation 5G wireless systems are required to transmit and receive at the same time in the same frequency band to enhance spectrum utilization and increase data capacity.

Project Scope

• RF and baseband variable delay lines and bandpass filters CMOS design for self-interference cancellation in full duplex wireless systems.
• Wideband quadrature RF canceller for single antenna full duplex wireless systems (CMOS/discrete).

Project Roadmap (two semesters)

1. Literature survey.
2. Full duplex wireless theory.
3. CMOS canceller design in baseband.
4. RF canceller design, implementation and measurement.
5. System integration.

Introduction

The emerging phase change materials (PCM) technology is a promising candidate for the implementation of high performance phase shifters for large phase arrays systems to support a large variety of applications such as automotive radars and satellite and telecom communications.

Project Scope

Device-level characterization of the PCM technology in Cadence Virtuoso and design phased arrays using finite-element electromagnetic solvers such as HFSS and CST.

Project Roadmap (one semester)

1. Literature survey.
2. PCM technology characterization.
3. Antenna array theory acquaintance.
4. Antenna phased array design.
5. Simulation performance evaluation.

Project Roadmap (two semesters)

Fabrication and lab measurements