Location History:
- Machida, JP (1998)
- Chlyoda-ku, Tokyo JP (2007)
- Fujisawa, JP (1999 - 2011)
Company Filing History:
9 out of 42,485 
1 out of 129 
1 out of 442 
Years Active: 1998-2011
Title: Yuji Ishida: Innovator in Digital Predistortion Technology
Introduction
Yuji Ishida is a prominent inventor based in Fujisawa, Japan, known for his significant contributions to the field of digital predistortion technology. With a total of 11 patents to his name, Ishida has made remarkable advancements that address the challenges faced in signal processing.
Latest Patents
One of Ishida's latest patents focuses on a digital predistortion transmitter. This invention effectively compensates for distortion when a predistortion transmitter encounters not only memory effects due to amplifier nonlinearity but also issues such as modulator DC offset, IQ unbalance, and local quadrature error. The proposed predistortor utilizes a polynomial predistortor that includes a polynomial basis generation portion and an inner product calculation portion. The polynomial basis generation portion delays the real and imaginary parts of a complex input signal for up to M samples, generating multiple signals that are combined to create monomials of maximum degree N. The inner product calculation portion then performs calculations using a coefficient vector to determine a polynomial value, outputting this as a complex signal.
Career Highlights
Throughout his career, Yuji Ishida has worked with notable companies, including Hitachi, Ltd. and Hitachi Communication Technologies, Ltd. His experience in these organizations has allowed him to refine his skills and contribute to innovative projects in the telecommunications sector.
Collaborations
Ishida has collaborated with esteemed colleagues, including Yoshinori Nagoya and Ken Takei. These partnerships have fostered a creative environment that has led to the development of cutting-edge technologies.
Conclusion
Yuji Ishida's work in digital predistortion technology exemplifies his commitment to innovation and excellence. His patents and collaborations reflect a deep understanding of the complexities involved in signal processing, making him a key figure in the field.
Inventor’s Patent Attorneys refers to legal professionals with specialized expertise in representing inventors throughout the patent process. These attorneys assist inventors in navigating the complexities of patent law, including filing patent applications, conducting patent searches, and protecting intellectual property rights. They play a crucial role in helping inventors secure patents for their innovative creations.