Generalized architecture of concurrent dual-band transmitter for spectrum aggregation system. - Toru Kitayabu; Hiroyasu Ishikawa (PIMRC, 2010)

Proposal of cross-carrier precoding for carrier aggregation enhancement. - Yuji Ikeda; Issei Kanno; Toru Kitayabu; Hiroyasu Ishikawa (PIMRC, 2011)

Effect of input-signal statistical property in delta-sigma modulator with non-uniform quantization. - Toru Kitayabu; Hiroyasu Ishikawa; Mao Hagiwara; Hiroshi Shirai (RWS, 2012)

A Delta-Sigma Modulator Using a Non-uniform Quantizer Adjusted for the Probability Density of Input Signals. - Toru Kitayabu; Mao Hagiwara; Hiroyasu Ishikawa; Hiroshi Shirai (IEICE Trans. Commun., 2012)