John F Collins

Title: John F Collins: Innovator in Convolutional Despreading Methods

Introduction

John F Collins is a notable inventor based in Rancho Palos Verdes, California. He has made significant contributions to the field of spread spectrum systems, particularly through his innovative patent. His work focuses on enhancing the efficiency of code phase determination in direct sequence spread spectrum signals.

Latest Patents

John F Collins holds a patent titled "Convolutional despreading method for rapid code phase determination of chipping codes of spread spectrum systems." This patent describes a convolutional despreading method that leverages the algebraic structure of spreading codes. It applies convolutional type decoding to received signal chip symbols, enabling rapid estimation of code phase. This method is particularly beneficial for the quick acquisition of direct sequence spread spectrum signals. The approach utilizes modeled reduced-state structures with branchword transitions to minimize metric computations. Additionally, it employs a modified convolutional sequential search algorithm, such as a modified Fano Tree or Viterbi trellis convolutional sequential search. The method can also directly determine a modulated data stream, providing demodulated data without the need for conventional cross-correlation despreading.

Career Highlights

John F Collins is associated with The Aerospace Corporation, where he applies his expertise in signal processing and spread spectrum technology. His innovative contributions have positioned him as a key figure in the advancement of communication systems.

Collaborations

Throughout his career, John has collaborated with notable colleagues, including Samuel Joseph Curry and David M Schwartz. These collaborations have further enriched his work and contributed to the development of advanced technologies in his field.

Conclusion

John F Collins is a distinguished inventor whose work in convolutional despreading methods has significantly impacted the field of spread spectrum systems. His innovative approaches continue to influence advancements in communication technology.