Company Filing History:
Years Active: 2012-2013
Title: Innovations by Andrew Friefeld
Introduction
Andrew Friefeld is an accomplished inventor based in Redmond, WA. He has made significant contributions to the field of RFID technology, holding 2 patents that showcase his innovative approach to solving complex problems.
Latest Patents
One of Andrew's latest patents focuses on RFID readers that mitigate colored noise. This invention utilizes an adaptive filter to enhance the performance of RFID readers by reducing the effects of colored noise in tag reply signals. The adaptive filter can take various forms, including a linear equalizer, a linear-predictive canceller, or a decision-feedback equalizer. It estimates the colored noise portion of the signal received from the tag and effectively removes this noise from the tag signal. The filter's noise estimate is based on the difference between a desired signal and a portion of the received signal. Additionally, the reader employs reader-generated training data, a continuous wave (CW) signal, and/or portions of the tag reply signal to adapt the filter for optimal performance.
Career Highlights
Andrew is currently employed at Impinj, Inc., where he continues to develop innovative solutions in the RFID space. His work has significantly advanced the capabilities of RFID technology, making it more reliable and efficient.
Collaborations
Throughout his career, Andrew has collaborated with notable colleagues, including Kurt Eugene Sundstrom and Paul F Dietrich. These partnerships have fostered a creative environment that encourages the development of groundbreaking technologies.
Conclusion
Andrew Friefeld's contributions to RFID technology through his patents demonstrate his commitment to innovation and excellence. His work continues to influence the industry and pave the way for future advancements.