John Zhongxuan Zhang

Title: Innovations by John Zhongxuan Zhang

Introduction

John Zhongxuan Zhang is a notable inventor based in Fremont, CA. He has made significant contributions to the field of telecommunications, particularly in the development of technologies that enhance the performance of X-DSL modems. With a total of 3 patents to his name, Zhang's work focuses on minimizing distortion in communication systems.

Latest Patents

Zhang's latest patents include a "Method and apparatus for pre-distortion of an X-DSL line driver." This invention provides a solution for minimizing in-channel distortion in X-DSL line drivers. The apparatus can be integrated into existing X-DSL architectures without the need for additional circuitry. It implements out-of-band monitoring to adaptively reduce interference and distortion. A unique training sequence is introduced, which allows for a comprehensive spectral characterization of the downstream signal space using a single upstream monitoring tone. This invention is versatile and can be applied to various communication protocols beyond X-DSL, including both wired and wireless media.

Another significant patent is the "Method and apparatus for digital to analog conversion with distortion calibration." This invention addresses in-band distortion in the transmit path of X-DSL modems. It provides a method for determining and correcting distortion in the time domain. The apparatus includes a calibrator that can utilize existing analog-to-digital conversion capabilities or a dedicated module. During calibration, a training signal is injected into the digital-to-analog converter, and the analog response is measured to create an analog model. This model is then used to improve the noise transfer function during modem operation.

Career Highlights

Zhang is currently employed at Ikanos Communications, Inc., where he continues to innovate in the field of telecommunications. His work has been instrumental in advancing the capabilities of X-DSL technology.

Collaborations

Zhang has collaborated with notable colleagues, including Dale Smith and Behrooz Rezvani, contributing to a dynamic work environment that fosters innovation.

Conclusion

John Zhongxuan Zhang's contributions to telecommunications through his patents demonstrate his commitment to enhancing communication technologies. His innovative approaches to minimizing distortion in X-DSL systems have significant implications for the industry.