Mitsubishi Electric Corporation

Tokyo Denki University

Takehiko Nishide

Masatsugu Higashinaka

Koji Tomitsuka

Takehiko Kobayashi

Takeshi Kawamoto

Akinori Nakajima

Hironobu Yamamoto

A timing estimation device according to the present invention includes a received signal memory that outputs a plurality of sample groups each of which is a first number of samples extracted at symbol rate intervals from an oversampled received signal containing a known sequence, with shifting their leading positions by one sample from each other, a reliability calculation unit that calculates a channel impulse response for each of the sample groups, based on the sample group, generates a replica of the received signal using the channel impulse response and the known sequence, and calculates a reliability value based on the sample group, the replica, and the channel impulse response, and a timing estimation unit that estimates a preceding wave arrival timing and a delayed wave arrival timing, based on the reliability value.

Timing estimation device and timing estimation method

A maximum likelihood sequence estimation circuit includes: a signal extraction unit that estimates a reception sample signal including a preceding wave component and a reception sample signal including a delayed wave component from a plurality of reception sample signals sampled from a reception signal at sample intervals shorter than symbol intervals, and extracts, based on an estimation result, both first reception sample signals and second reception sample signals from the plurality of reception sample signals at the symbol intervals; and a maximum likelihood sequence estimation unit that estimates a maximum likelihood sequence using the first reception sample signals extracted and the second reception sample signals extracted.

Maximum likelihood sequence estimation circuit, receiving device, and maximum likelihood sequence estimation method

A receiving apparatus includes: a control signal channel estimator to estimate a channel for a control signal using a pilot signal extracted from a received signal, and generate a first channel estimate value; a control signal FED unit to perform frequency domain equalization processing on the control signal by using the first channel estimate value; a control signal demodulator to demodulate the equalized control signal; a control signal encoder to encode a demodulated equalized control signal; an FFT unit to generate, from the encoded equalized control signal, a control signal replica; a data channel estimator to estimate a channel for the data signal by using the control signal replica and the first channel estimate value; and a data FDE unit to perform frequency domain equalization processing on the data signal by using the second channel estimate value.

Receiving apparatus and transmitting-receiving apparatus

The invention provides a game ball, useful for children's safety, which can be detected far enough away a distance by a vehicle-onboard radar. The invention provides a game ball wherein a reflector memberis disposed within a spherical shell, the diagonal distance of the reflector member coincides with the inner diameter of the spherical shell, the reflector member has a shape constructed by combining three regular polygon platesA,B,C, the center angle of one side thereof being an integral submultiple of 90&#xb0;, in such a manner that the centers of the three regular polygon plates are coincident and that the three regular polygon plates are perpendicular to each other, and a surface of said reflector memberis imparted with electromagnetic wave reflectivity.

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Tokyo, Japan

Takehiko Nishide