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This paper proposes a spectral shaping method for OFDM signals that reduces nonlinear distortion. In this method, new subcarriers, which are produced from original subcarriers, are inserted into a conventional OFDM signal to smooth the spectral shape. The results of computer simulations in a nonlinear channel show that spectral-shaped OFDM signals have lower out-of-band spectrum properties and bit-error...
We demonstrated reciprocating optical modulation with Er-doped LiNbO3 for high- order sideband generation, where reciprocating modulation process can be selectively amplified. The sideband component of 50 GHz was successfully enhanced. The gain was 8 dB.
A surface-mount power amplifier module (PA-module) for 2.6 GHz / 3.5 GHz WiMAX application have been developed. For 2.6 GHz PA- module, linear gain of 22 dB, gain flatness of less than 0.5 dBp-p and saturation output power of more than 41 dBm were achieved with 200 MHz bandwidth. For 3.5 GHz PA-module, linear gain of 25 dB, gain flatness of less than 0.5 dBp-p, and saturation output power of more...
The terahertz (THz) spectroscopic images of the paraffin embedded cancer tissues have been measured by a THz time domain spectrometer. Though the potential of the THz spectrum to the cancer diagnostics have been reported, it is sometimes difficult to distinguish normal and cancer parts due to the variety of the tissues. Thus, the systematic analysis should be introduced to clarify their difference...
Second-order nonlinear-optical coefficients of undoped and MgO-doped near-stoichiometric LiNbO3 are measured at the fundamental wavelength of 1.31 mum. The values are found to be nearly same with those of congruent LiNbO3 within the experimental accuracy.
The purpose of our study is measurement of the value of the translation and the rotation between the corresponding teeth of digital dental models before and after an orthodontic treatment. We used digital models from plaster models digitized by 3D scanner, and divide the polygons into several teeth using our original GUI. We measured the distance from a polygon in the jaw before the treatment to the...
In this paper we propose a method of calculating the saliency map of an input image. In this method the saliency gets higher in the areas where the image features are different than those in the surrounding areas and where the features are unfamiliar. Based on this method, we also propose a method to apply the idea of calculating the saliency to the problem of determining the most efficient distribution...
This paper reports reliability test results for physical contact between connectors assembled with a glass ceramic ferrule connector and a zirconia ferrule connector using zirconia split sleeve
This paper presents an overview of compound semiconductor electron devices. GaAs-based MESFET, HEMT, and HBT have deeply penetrated into the markets of communications fields. On the other hands, InP-based HEMT and HBT just are becoming ready for practical use in the ultra-high speed and low power electronics owing to the excellent transport properties. Finally, it will be shown that the wide bandgap...
This paper presents an optical waveguide switch with a switching time of 1.26-1.39 ns in the C band and demonstrates optical packet switching for an optical packet stream with a 40-Gbps NRZ signal.
A McKibben artificial muscle has suitable properties for realizing walking and running biped robots such as light weight, springy nature, and efficiency. Since controlling McKibben muscles is difficult because of their nonlinearity, we have to design robot dynamic parameters carefully. If the parameters are designed properly, the walking controller can be simple. In this paper, we describe a developed...
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