Stephen J Foley

Title: Innovations by Stephen J. Foley: A Pioneer in RF Amplification and TDMA Systems

Introduction

Stephen J. Foley is a notable inventor based in Santa Clara, CA, with a remarkable contribution to the field of wireless communications. He holds two patents that demonstrate his innovative approach to high linearity multicarrier RF amplifiers and the methods that enhance the performance of Time Division Multiple Access (TDMA) systems.

Latest Patents

Foley's first patent focuses on a "High linearity multicarrier RF amplifier." This invention introduces a hybrid multicarrier RF power amplifier linearization architecture, which combines ACT and feed-forward amplifier stages. The design achieves high output distortion rejection and improved amplifier linearity. It features a carrier cancellation loop that integrates with a main RF power amplifier stage, utilizing parallel RF power amplifiers connected through intermod-complementing predistortion paths. The feed-forward loop, which includes a feed-forward RF power amplifier, produces a composite amplified output signal with significantly reduced intermodulation products. The innovative use of vector modulators controlled by a digital signal processor drives enhancements in the overall system performance.

Foley's second patent describes a "Method and apparatus employing delay elements in multiple diversity." This invention addresses the challenges faced in conventional TDMA wireless systems, particularly concerning the distance constraints between mobile units and base transceiver systems (BTS). By using spatially-diverse antennas for receiving uplink signals, this method not only mitigates deep fades but also improves signal strength. In-band translator components are utilized, including delay elements for slot-by-slot selective spatial diversity and automatic level control, which drastically reduces uplink backhaul dynamic range and facilitates greater distances in backhaul communications.

Career Highlights

Throughout his career, Stephen J. Foley has contributed to various companies, most notably Spectrian Corporation and Airnet Communications Corporation. His work in these organizations has been pivotal in advancing technologies in RF amplification and wireless communication systems.

Collaborations

Foley has collaborated with several esteemed professionals, including Armando C. Cova and Emil James Crescenzi, Jr. His ability to work alongside such talented individuals highlights his commitment to innovation and excellence in engineering.

Conclusion

Stephen J. Foley's patents reflect his significant contributions to the fields of RF amplification and TDMA systems. His innovative designs not only address key challenges in wireless communications but also pave the way for further advancements in the industry. Through his work, Foley continues to influence the evolution of technologies that are essential for modern communication systems.