Company Filing History:
Years Active: 1993-1998
Title: The Innovations of Todd A. Stewart
Introduction
Todd A. Stewart is a notable inventor based in Vancouver, Canada. He has made significant contributions to the field of modem technology, holding a total of eight patents. His work focuses on enhancing data transmission through innovative modulation techniques.
Latest Patents
Among his latest patents is a groundbreaking invention titled "Signal modulation employing a pseudo-random sequence of pilot symbols." This modulator encodes data using data symbols interspersed with pilot symbols for effective transmission to another modem. The demodulator decodes the data symbols from the received signal, sampling it at four times the symbol rate. The sampled signal is converted into quadrature signals and low-pass filtered to create a complex baseband signal. By synchronizing the sampling of data symbols with the pilot symbols, full modem synchronization is maintained even under challenging conditions, such as low signal-to-noise ratios or noise bursts. The pilot symbols also play a crucial role in updating equalizer tap coefficients, minimizing errors caused by channel fading and noise. Additionally, they are used to delimit data frames, eliminating the need for bit and frame synchronization.
Another significant patent is the "High performance modem using pilot symbols for equalization and frame." This invention shares similar features with the previous one, emphasizing the importance of pilot symbols in maintaining synchronization and improving data transmission reliability.
Career Highlights
Todd A. Stewart is currently employed at Glenayre Electronics, Inc., where he continues to innovate in the field of modem technology. His work has had a lasting impact on the industry, particularly in enhancing the performance of data communication systems.
Collaborations
Throughout his career, Todd has collaborated with esteemed colleagues such as Robert F. Marchetto and Paul K. Ho. These partnerships have contributed to the development of advanced technologies in the field.
Conclusion
Todd A. Stewart's contributions to modem technology through his innovative patents have significantly advanced data transmission methods. His work continues to influence the industry, showcasing the importance of pilot symbols in maintaining synchronization and improving communication reliability.