Xinyi Li   Jingfu Bao   Yulin Huang   Benfeng Zhang   Tatsuya Omori   Ken ya Hashimoto   
Microsystem Technologies 25(7) 2783-2792 2019年7月
This paper proposes use of traveling wave type excitation sources for the scattering analysis of acoustic waveguides using the finite element method (FEM). This technique allows to generate only one particular mode selectively. Scattering behavior...
Yulin Huang   Jingfu Bao   Xinyi Li   Benfeng Zhang   Luyan Qiu   Tatsuya Omori   Ken Ya Hashimoto   
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control 66(7) 1255-1263 2019年7月
This paper proposes a technique to analyze surface acoustic wave (SAW) scattering at discontinuity in grating structures using the hierarchical cascading technique. The traveling wave excitation is applied to generate a specific SAW mode. Then the...
Xinyi Li   Jingfu Bao   Luyan Qiu   Naoto Matsuoka   Tatsuya Omori   Ken Ya Hashimoto   
Japanese Journal of Applied Physics 58(SG) 2019年
This paper proposes an application of a general purpose graphic processing unit (GPGPU) to the finite element method analysis based on the hierarchical cascading technique (HCT). It is proved that GPGPU can accelerate the HCT significantly, especi...
Naoto Matsuoka   Luyan Qiu   Xinyi Li   Tatsuya Omori   Ken Ya Hashimoto   
Japanese Journal of Applied Physics 58(SG) 2019年
This paper discusses the applicability of a single precision computation with a graphics processing unit for the finite elements method simulation of surface acoustic wave (SAW) devices using the hierarchical cascading technique (HCT). The HCT sim...
Luyan Qiu   Xinyi Li   Naoto Matsuoka   Tatsuya Omori   Ken Ya Hashimoto   
Japanese Journal of Applied Physics 58(SG) 2019年
This paper investigates the impact of transverse mode resonances on second harmonic (H2) generation in radio-frequency bulk acoustic wave devices. Previous work indicated that second-order nonlinearity of the main mode can be well simulated by one...
Fumiaki Ukaji   Chang Jun Ahn   Tatsuya Omori   Ken Ya Hashimoto   
Proceedings of the IEEE International Conference on Industrial Technology 2016-May 860-865 2016年5月
Multi-user multi-input multi-output (MU-MIMO) can achieve more transmission speed and multi-user diversity. Furthermore, since frequency symbol spreading (FSS) can mitigate the effect of frequency selective fading, it is useful for improving the B...
Masaya Okamura   Chang Jun Ahn   Tatsuya Omori   Ken Ya Hashimoto   
2015 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2015 532-536 2016年3月
Massive MIMO has been recognized as promising ways to provide high speed data transmission. However, since the number of pilot symbol is proportionally depending on the number of transmit antenna, the total transmission rate of massive MIMO would ...
Kotaro Abe   Chang Jun Ahn   Tatsuya Omori   Ken Ya Hashimoto   
2015 International Symposium on Intelligent Signal Processing and Communication Systems, ISPACS 2015 417-421 2016年3月
Recently, visible light communication(VLC) is widely researched due to the spreading of LED usage. It satisfies demands of ubiquity and high speed communication. However, it is impossible to transmit the phase information and frequency information...