Name: https://tnkmsysh.wixsite.com/mysite/home
Address: JP

Research targets

Developing wireless communication systems that saves energy.
Developing new wireless communication systems that make life safer and more comfortable.
Developing ubiquitous communication that can be easily used by anyone, anytime, anywhere.

Outline of research items

- Advanced Satellite Communications Systems (detail-1, detail-2)

- Spatially Superposed Highly Efficient 32APSK Transmission System　⇒ Ref.　(detail)

- Spatially superposed highly efficient 64QAM transmission system ⇒ Ref.　(detail)

- Mobile multibeam satellite communications and multiport amplifier (MPA)

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~~Spatially superposed highly efficient M-ary Modulation ( 16QAM, 32APSK, 64QAM )~~

~~Microwave spatial-power combining technology -spatial superpositon-~~

~~Battery-less wireless communication system for rescuing disaster victims~~

~~Energy harvesting battery-less wireless communications for IoT.~~

~~Multiport amplifier (MPA) and mobile satellite communications system~~

~~Unwanted emissions of multi-carrier transmitter in spurious domain~~

~~Frequency assigment of reducing intermodulation interference~~

~~Battery-less ubiquitous wireless communications~~

~~Detection of earthquake presursor using electromagnetic wave propagation fluctuation.~~

~~Signal processing technology with FPGA in wireless communications~~

~~Economical ubiquitous wireless communications system~~

~~Nonlinear distortion analysis and compensation~~

~~Multimedia satellite communications system~~

~~Research and development of communication payload (transponder)~~

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- Frequency assignment effective for reducing intermodulation interference in an multibeam satellite system ⇒　Ref-1. Ref-2, (detail)

- Nonlinear analysis of high power amplifier (HPA)

Algorithm for simple estimation of spurious emission level generated from HPA's AM-to-AM and AM-to-PM conversions.　
The dotted line in the following figure shows a fixed response that does not depend on the device, and the suurious level can be obtained by calculating only the part outside the dotted line.