Takaaki Ishibashi
Kyushu Institute of Technology
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Publication
Featured researches published by Takaaki Ishibashi.
ieee region 10 conference | 2010
Hiroshi Shiratsuchi; Nobuo Iwasaki; Hironori Tanaka; Takaaki Ishibashi; Naomi Haratani; Yosimasa Nakano; Hiromu Gotanda
In this paper we propose a blind estimation of fading coefficients without using the pilot symbols in QAM-OFDM systems subjected to carrier frequency offset (CFO), where the phases of the fading coefficients are within ±7r/4. First, under a frequency selective fading channel, the inter-carrier interference (ICI) due to CFO is formulated in the framework of independent component analysis (ICA). Then the permutation and scale uncertainty inherent in ICA is resolved and CFO is estimated. Next, based on the CFO estimation results, the fading coefficients are estimated by use of the fact that symbol constellation at each sub-carrier is stretched/shrunk and rotated according to the value of its fading coefficient. Then, the unknown transmitted symbols are restored by use of the coefficient estimates. Finally, the validity of the proposed approach is confirmed from several simulations for 16QAM-OFDM.
society of instrument and control engineers of japan | 2006
Takaaki Ishibashi; Katsuhiro Inoue; Hiromu Gotanda; Kousuke Kumamaru
ICA (Independent Component Analysis) can separate unknown source signals from their mixture signals without information on the transfer functions, provided that the sources are statistically independent. When the number of the source signals is equal to that of the observed signals, the original sources can be recovered except for indeterminacy of scale and permutation. However, the number of the sources is unknown in a real environment. In this paper, we propose an estimation method for the number of the sources based on the joint distribution of the observed signals under two-sensor configuration. From several simulation results, it is found that the number of the sources is coincident to that of peaks in the histogram of the distribution
Archive | 2003
Hiromu Gotanda; Kazuyuki Nobu; Takeshi Koya; Keiichi Kaneda; Takaaki Ishibashi
Transactions of the Institute of Systems, Control and Information Engineers | 2009
Takeshi Koya; Takaaki Ishibashi; Hiroshi Shiratsuchi; Hiromu Gotanda
Proceedings of the ISCIE International Symposium on Stochastic Systems Theory and its Applications | 2010
Takaaki Ishibashi; Katsuhiro Inoue; Hiromu Gotanda; Kousuke Kumamaru
society of instrument and control engineers of japan | 2004
Takaaki Ishibashi; Katsuhiro Inoue; Takeshi Koya; Hiromu Gotanda; Kousuke Kumamaru
Journal of Advanced Computational Intelligence and Intelligent Informatics | 2010
Takeshi Koya; Nobuo Iwasaki; Takaaki Ishibashi; Go Hirano; Hiroshi Shiratsuchi; Hiromu Gotanda
Transactions of the Institute of Systems, Control and Information Engineers | 2006
Takaaki Ishibashi; Katsuhiro Inoue; Hiromu Gotanda; Kousuke Kumamaru
The 5th IIAE International Conference on Industrial Application Engineering 2017 (ICIAE2017) | 2017
Takaaki Ishibashi; Kana Higuchi; Chiharu Okuma; Kiyoteru Hayama
international conference on intelligent systems | 2015
Kiyoteru Hayama; Takaaki Ishibashi; Hirohito Shintani; Minoru Motoki; Hiromu Gotanda
