This blink detecting system includes: a Doppler sensor for obtaining a Doppler signal; a first detecting unit which obtains an amplitude signal of the Doppler signal, divides the amplitude signal into a plurality of cells that are continuous in the time axis direction, sets a first threshold on the basis of amplitude values of cells that are before and after a cell of interest but are not adjacent thereto, and detects a signal component equal to or greater than the first threshold in the cell of interest; and a blink determining unit which removes erroneous detections from the signal component equal to or greater than the first threshold, on the basis of the characteristics of a blink waveform, and determines that the remaining signal component is a blink.

An event detector capable of detecting an event with a high degree of accuracy even by using a narrowband signal has a plurality of antennas (21) for receiving radio waves transmitted by a transmitter, a correlation matrix operation means (22) for assuming a signal received by the antennas (21) as a received vector and operating a correlation matrix from the received vector, an eigenvector operation means (23) for performing the eigenvalue expansion of the correlation matrix operated by the correlation matrix operation means (22) to operate an eigenvector that covers a signal subspace, and an event detecting means (24) for detecting the aging of the eigenvector operated by the eigenvector operation means (23) for event detection.

In the orthogonal frequency division multiplexing (OFDM) the multipath exceeding a guard interval (GI) is one of obstacles for high data rate transmission. For the purpose of the interference suppression the authors have proposed the canceller algorithm naming DWCC； where the canceller operation is based on decision feedback equalization (DFE)； but the performance of the canceller is still subject to the frequency selectivity since the tentative symbol detection at the deep faded subcarriers could not be reliable. In this paper turbo equalized double window cancellation and combining (TE-DWCC) is proposed. Throughout the paper； it is found that the error rate performance of TE-DWCC depends on how to incorporate the channel decoding gain from turbo equalization into DWCC. In addition； it is also shown that TE-DWCC is more compatible with the hard decision feedback (HDF) rather than the soft decision feedback (SDF) due to the ICI elimination method. Finally； by varying interference level； code rate； and decision feedback type； the performances of TE-DWCC are compared with the conventional canceller that adopts turbo equalization in the exponentially distributed slow fading channel.

This paper proposes signal-subspace-partition event filtering for the event detection system with signal subspace spanned by eigenvector in [3][4]. To detect an event with small changes of signal subspace components； we emphasize the changes of signal subspace components by selecting an appropriate component of signal subspace with signal-subspace partition. In addition； to detect an event in the presence of the changes of signal subspace components due to some undesired movements； such as by a pet； we mask or attenuate the changes of signal subspace components by selecting an appropriate component of signal subspace with signal-subspace partition. In the proposed method； firstly； we estimate direction of arrival (DOA) to obtain the basis of the signal subspace. Next； we make the parted signal subspace by combining each base of the signal subspace. The parted signal subspace is used as the filter. The experimental results reveal that the proposed method can emphasize or mask or attenuate events using signal-subspace partition.