Keitaro Otsuka

Title: Keitaro Otsuka and His Patent Work.

Introduction

Keitaro Otsuka is an inventor associated with Yokohama, Japan, and Fujitsu Semiconductor Limited. His work includes inventions in signal transmission and signal processing. The supplied information lists 3 patents.

Latest Patents

“Transmission Apparatus, Transmission Method, Reception Apparatus, and Reception Method” describes a system that converts transmission data into frequency-domain and then time-domain signals for transmission. It includes a unit that generates multiple preamble patterns, including patterns formed by repeating bits from a first preamble pattern at different intervals, and a unit that transmits a signal containing at least two of those patterns.

“Signal Processing Device, Method and Receiving Device” describes a signal-processing system that uses two correlators to compare a received signal with reference patterns derived from different portions of that signal. A phase-difference generation circuit uses the resulting correlation peaks to determine the phase difference between those portions.

Career Highlights

Otsuka’s listed patent work focuses on communications technology, including transmission formats, reception methods, correlation processing, and phase-difference estimation. These inventions address signal handling across both transmitting and receiving systems.

Collaborations

The supplied information identifies Takeshi Inoue and Kazuya Kitasako as Otsuka’s coworkers. It does not specify their roles in the listed patents.

Conclusion

Keitaro Otsuka’s documented inventions reflect work on communication systems and signal processing during his association with Fujitsu Semiconductor Limited.