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Master Thesis: Investigating ARC on millimeter Wave Radios at Ericsson

Stockholm, , Sweden -

Full Time

Start Date

Immediate

Expiry Date

05 Jan, 26

Salary

0.0

Posted On

07 Oct, 25

Experience

0 year(s) or above

Remote Job

Yes

Telecommute

Yes

Sponsor Visa

Skills

Electrical Engineering, Applied Physics, MATLAB, RF Measurements, Antenna Arrays, Massive MIMO, Power Amplifier, Digital Predistortion, Non-linearity, Validation Platform, Millimeter Wave, ARC Emulation, Signal Strength, Impedance, Communication, Performance

Industry

Telecommunications

Description

Join our Team Antenna arrays play a crucial role in enhancing signal strength and directionality in Massive MIMO radios. They enable high-frequency communication with improved performance and efficiency. However, this technology presents challenges that must be addressed to achieve best-in-class performance. For example, in antenna arrays, coupling between antenna elements causes signals originating from one element to be coupled into adjacent elements. This coupling changes the impedance experienced by the power amplifier (PA), depending on the phase and gain relationship between antennas. This impedance change is known as the Active Reflection Coefficient (ARC). ARC affects the PA transfer function and, consequently, the linearization applied to the PA by the digital predistortion (DPD) block. Thus, ARC directly impacts the overall radio performance. To better validate the radio transmitter's performance, a validation platform capable of estimating ARC's impact while DPD is applied to a power amplifier is necessary. Thesis Description This thesis will specifically focus on investigating the effects of ARC on radio performance, targeting millimeter Wave (mmW) applications. The following steps are envisioned as part of the thesis work: Investigate ARC fundamentals and their impact on power amplifier non-linearity. Work with a DPD testbed to linearize mmW power amplifiers. Add ARC emulation measurements to the existing DPD testbed. The thesis will conclude with a presentation of results to the Ericsson research team. Qualifications This project is aimed at students in electrical engineering, applied physics, or related fields. Experience with MATLAB and RF measurements is preferable. Extent: 1-2 students, 30hp each Location: Lund Preferred Starting Date: February 2026

Responsibilities

The thesis will focus on investigating the effects of Active Reflection Coefficient (ARC) on radio performance, specifically for millimeter Wave applications. This includes working with a Digital Predistortion testbed to linearize power amplifiers and adding ARC emulation measurements.