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This paper evaluates the Q-factor improvement by maximum ratio combining for optical diversity transmission signals under the condition of the parametric process due to the Kerr effect and group-velocity dispersion.
A new noise reduction method suitable for autonomous mobile robots was proposed and applied to preprocessing of a hands-free spoken dialogue system. When a robot talks with a conversational partner in real environments, not only speech utterances by the partner but also various types of noise, such as directional noise, diffuse noise, and noise from the robot, are observed at microphones. We attempted...
In this paper, a metric weighting scheme on a coded fractional sampling orthogonal frequency division multiplexing (FS OFDM) system is investigated. FS achieves path diversity with a single antenna through oversampling and subcarrier-based maximal ratio combining (MRC). Though the oversampling increases diversity order, correlation among noise components may deteriorate bit error rate (BER) performance...
Broadband two-dimensional multicolored array with more than nine periodic columns and more than ten rows was generated in a sapphire plate. The array structure was sensitive to the in-plane rotation of the sapphire plate.
In this paper, we propose a statistical scheme for recognizing three-dimensional textures shown in motion images, which we call dynamic textures. The texture characteristics emerges in the distinct movement in the motion images, and the dynamic cues would be useful especially for recognizing ambiguous texture patterns in noisy images. We apply cubic higher-order auto-correlation (CHLAC) to extract...
A noise suppression technique using overlapped FFT for carrier sensing of cognitive radio is proposed. The energy detection method is modified. A broadband signal is FFTed and the averaged power of each bin throughout the carrier-sensing period is calculated and judged against a threshold. At the process, adjacent FFT frames are overlapped greatly but with sufficiently large interval compared to the...
A diversity scheme with fractional sampling (FS) in OFDM receivers is investigated recently. When a sharp filter is employed, the correlation of noise samples among the adjacent subcarriers increases, and the performance of this scheme is deteriorated. Therefore, low-complexity subcarrier based MMSE combining scheme with the subblock of the noise covariance matrix is proposed in this paper. Numerical...
The normalized radar cross section (NRCS) of ocean surface is measured from three directions of illumination by an air-borne dual-frequency synthetic aperture radar (SAR) in the L- and X-bands, and the dependency of the NRCS and the polarization ratio on the relative wind direction is analyzed. In the X-band, the dependencies of the NRCSs in the parallel polarizations are different each other. The...
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