Xiang Yuan

Title: The Innovations of Xiang Yuan

Introduction

Xiang Yuan is a notable inventor based in Chandler, AZ (US), recognized for his contributions to the field of communications technology. With a total of 5 patents to his name, Yuan has made significant advancements, particularly in the realm of GPS systems and CDMA-based communications.

Latest Patents

One of his latest patents is the "Noise floor independent delay-locked loop discriminator." This invention provides a system and method for code tracking in a CDMA-based communications receiver. In this system, a CDMA receiver, such as a GPS receiver, receives a signal and demodulates it to yield a digital IF signal. The digital IF signal is then down-converted to a received code signal. Early, prompt, and late correlation results are determined by correlating the received code signal with early, prompt, and late duplicates of the received code signal. These correlation results are utilized to calculate a code phase error using a noise-floor independent function of all three correlation results.

Another significant patent is related to "Time-to-first-fix for position determination." This invention improves the time-to-first-fix (TTFF) for GPS systems by comparing the time-of-week (TOW) to the sub-frame identification (ID). In one embodiment, this comparison involves dividing the TOW to form a ratio and performing a modulus operation on the ratio to create a remainder, which is then incremented. If the incremented remainder equals the sub-frame ID, the TOW is assumed to be valid, thus providing a time of transmission. This time of transmission can then be used to calculate pseudoranges and determine a receiver's location.

Career Highlights

Xiang Yuan has worked with prominent companies in the technology sector, including Sirf Technology, Inc. and Motorola Corporation. His experience in these organizations has contributed to his expertise and innovative capabilities in the field.

Collaborations

Yuan has collaborated with several talented individuals throughout his career, including Gang Xie and George Jeffrey Geier. These collaborations have likely fostered an environment of creativity and innovation, leading to the development of impactful technologies.

Conclusion

Xiang Yuan's contributions to the field of communications technology, particularly through his patents and career experiences, highlight his role as a significant inventor. His work continues to influence advancements in GPS systems and CDMA communications.