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Years Active: 1999-2001
Title: Kazuhiro Umetsu: Innovator in CDMA Technology
Introduction
Kazuhiro Umetsu is a notable inventor based in Yokohama, Japan. He has made significant contributions to the field of telecommunications, particularly in the development of CDMA technology. With a total of 2 patents, Umetsu's work has had a lasting impact on data transmission and reception.
Latest Patents
Umetsu's latest patents include a CDMA receiver and a data receiving apparatus. The CDMA receiver patent describes a system where an A/D converter over-samples an analog reception baseband signal. This signal is converted into a digital reception baseband signal using a sampling clock that is twice the frequency of the chip clock. A correlator then obtains a correlation value between the digital reception baseband signal and a pilot spreading code that is synchronized with the reception timing. Additionally, a phase difference detecting unit measures the phase difference between the digital reception baseband signal and the reception timing based on the correlation value. A timing controlling unit adjusts the reception timing to eliminate the detected phase difference.
The data receiving apparatus patent outlines a method for comparing the received signal strength of multiple antennas. This is achieved by utilizing the timing of a sync word, which is not necessary for synchronization acquisition, among several sync words contained in a subframe of a receiving signal. The apparatus selects the antenna with the highest received signal strength based on the comparison results.
Career Highlights
Throughout his career, Kazuhiro Umetsu has worked with prominent companies such as Matsushita Electric Industrial Co., Ltd. and Matsushita Communication Industrial Co., Ltd. His experience in these organizations has allowed him to refine his skills and contribute to innovative projects in telecommunications.
Collaborations
Umetsu has collaborated with notable colleagues, including Keiichi Ikawa and Tetsuaki Nakanishi. These partnerships have fostered a creative environment that has led to advancements in technology.
Conclusion
Kazuhiro Umetsu's contributions to CDMA technology and data reception systems highlight his role as an influential inventor in the telecommunications industry. His patents reflect a commitment to innovation and excellence in engineering.