Lis-Mari Ljunggren

Title: Inventor Lis-Mari Ljunggren: Innovating VDSL Technology in Lulea

Introduction

Lis-Mari Ljunggren is a distinguished inventor based in Lulea, Sweden, recognized for her impactful contributions to telecommunications technology. With a total of two patents to her name, she has demonstrated a strong ability to innovate and enhance the functionality of VDSL systems, which play a vital role in modern internet connectivity.

Latest Patents

Among her notable inventions are two patented technologies that have significantly advanced VDSL performance. The first patent focuses on a VDSL modem that is ingeniously divided into digital and analog components. The analog section, situated in an optical node, integrates crucial elements such as an A/D converter, D/A converter, filter, amplifier, hybrid/balun, adaptive noise attenuator, and an optical interface, complemented by potential echo cancellation capabilities. On the digital side, the modem includes an FFT/IFFT processor, synchronizer, equalizer, interleaving unit, error correction unit, protocol manager, and an optical interface. This innovative design simplifies the synchronization of the modem while reducing power consumption in the optical node, thereby enhancing overall efficiency.

Her second patent addresses the synchronization of nodes within VDSL systems. This arrangement provides time synchronization for optical VDSL nodes sharing a common cable segment between subscribers and a local station, utilizing external systems like GPS for time referencing. This synchronization minimizes near-end cross-talk among VDSL systems, achieving higher performance and reliability. Each node incorporates a receiver for synchronization signals and maintains a high-stability internal oscillator to ensure a dependable clock signal.

Career Highlights

Lis-Mari Ljunggren is currently associated with STMicroelectronics N.V., a global leader in semiconductor solutions. Her role within the company allows her to harness her expertise in innovation and technology development, contributing to advancements in communication technology.

Collaborations

Throughout her career, Lis-Mari has collaborated with esteemed colleagues such as Sven-Rune Olofsson and Joachim Johansson, enhancing the diversity of ideas and expertise in developing cutting-edge telecommunications solutions. Their combined efforts have played a significant role in advancing the capabilities of VDSL technology.

Conclusion

Lis-Mari Ljunggren is a visionary inventor whose work significantly contributes to the field of telecommunications. Her innovative patents not only enhance VDSL technology but also demonstrate a commitment to improving connectivity and communication efficiency. As she continues her work at STMicroelectronics N.V., her inventions are likely to shape the future of the industry.