Location History:
- Atsugi, JP (1998 - 2004)
- Kanagawa, JP (2004 - 2008)
- Yokohama, JP (2006 - 2008)
Company Filing History:
5 out of 575 
4 out of 27,375 
2 out of 16,453 
Years Active: 1998-2008
Title: Hiroshi Itahara: Innovator in Multicarrier Transmission Technologies
Introduction
Hiroshi Itahara is a prominent inventor based in Kanagawa, Japan. He has made significant contributions to the field of telecommunications, particularly in the development of multicarrier transmission methods. With a total of 11 patents to his name, Itahara's work has paved the way for advancements in mobile communications.
Latest Patents
One of Itahara's latest patents is the "Multicarrier transmission method and apparatus." This innovative apparatus achieves both power efficiency in high-frequency amplifiers and quality of transmission signals in radio transmission systems. It supports high-speed data packet transmission in next-generation mobile communications. The apparatus features an adaptive peak limiter that performs adaptive hard limit processing on baseband signals. Additionally, a multicarrier signal generating circuit with a peak suppressing function processes the synthesized multicarrier signal, while a hybrid distortion compensating circuit corrects non-linear distortion caused by the high-frequency amplifier. The multicarrier signal is then transmitted from an antenna.
Another notable patent is the "Synchronous follow-up apparatus and synchronous follow-up method." This apparatus includes a Phase-Locked Loop (PLL) portion that outputs a first clock signal. The control loop portion generates a reference frequency signal and a second clock signal that matches the frequency of the first clock signal. It also produces a frequency control signal to adjust the frequency of the second clock signal based on the frequency difference that occurs over time.
Career Highlights
Hiroshi Itahara has worked with several esteemed companies throughout his career. Notably, he has been associated with Anritsu Corporation and Matsushita Electric Industrial Co., Ltd. His experience in these organizations has contributed to his expertise in telecommunications and innovation.
Collaborations
Throughout his career, Itahara has collaborated with notable colleagues, including Yuichi Hagiwara and Takashi Seike. These collaborations have further enriched his work and contributed to the advancements in the field.
Conclusion
Hiroshi Itahara's contributions to multicarrier transmission technologies have significantly impacted the telecommunications industry. His innovative patents and collaborations highlight his role as a leading inventor in this field.