Company Filing History:
Years Active: 2002-2003
Title: John Rolland Welch: Innovator in RF Signal Processing
Introduction
John Rolland Welch is a notable inventor based in Mt. Laurel, NJ (US). He has made significant contributions to the field of radio frequency (RF) signal processing, holding a total of 2 patents. His work focuses on methods for correcting phase and amplitude imbalances in RF signals, which are crucial for enhancing communication systems.
Latest Patents
Welch's latest patents include a "Method and system for correcting phase and amplitude imbalances of a quadrature modulated RF signal." This invention addresses the need to induce errors in both amplitude and phase in various combinations to determine the necessary correction values for offsets. The first embodiment of this patent applies the same offsets in three different combinations to ascertain the required corrections. The second embodiment introduces a fourth measurement to determine an unknown control scale factor for balance adjustments.
Another significant patent is the "Method and system for DC offset correction of a quadrature modulated RF signal." This invention corrects DC offset errors by introducing a specific trial offset correction value into the DC offset correction circuits multiple times. By measuring the carrier power resulting from each trial, the necessary correction components can be determined. The first embodiment employs specific offsets in three different measurement combinations, while alternative embodiments explore additional measurements to account for unknown power scale factors.
Career Highlights
Welch is currently associated with Lucent Technologies Inc., where he continues to innovate in the field of RF signal processing. His expertise has led to advancements that improve the performance and reliability of communication systems.
Collaborations
Throughout his career, Welch has collaborated with notable colleagues, including Israel Amir and Michael S. Heutmaker. These partnerships have contributed to the development of his innovative patents and have fostered a collaborative environment for technological advancement.
Conclusion
John Rolland Welch is a distinguished inventor whose work in RF signal processing has led to significant advancements in the field. His patents reflect a deep understanding of the complexities involved in signal correction, making him a valuable contributor to modern communication technologies.