Japan Science and Technology Agency

Radius Co., Ltd.

Kabushiki Kaisha Toshiba

Kyushu University

Tohru Kohda

Kazuyuki Aihara

Yoshihiko Horio

Kenya Jinno

Satoshi Hironaka

Akio Tsuneda

In accordance with an embodiment of the present invention, a method for receiving a signal, comprising the estimation step for estimating time and frequency shifts that are embedded in the received signal, to cancel-out shifts, wherein the method refers to the non-commutative shift parameter space of co-dimension 2.

Method for receiving an image signal and method for transmitting an image signal

Receiver method, receiver, transmission method, transmitter, transmitter-receiver system, and communication apparatus

There is provided a data conversion method based on negative &#x3b2;-map suited for an A/D converter or chaos generator, that is adapted to an integrated circuit and capable of providing stable operation of the circuit. The data conversion method based on negative &#x3b2;-map includes a discrete time integratorhaving an amplification coefficient s and a damping factor &#x3b2;, a quantizerconnected in series to the discrete time integrator, and a feedback circuit connected from an output of the quantizerto an input of the discrete time integrator

Data conversion method based on negative &#x3b2;-map

There is provided a data conversion method based on &#x3b2;-map suited for an A/D converter or chaos generator, that is adapted to an integrated circuit and capable of providing stable operation of the circuit. The data conversion method based on scale-adjusted &#x3b2;-map includes a discrete time integratorhaving an amplification coefficient s(1&#x2212;&#x3b2;) and a damping factor &#x3b2;, a quantizerconnected in series to the discrete time integrator, and a feedback circuitconnected from an output of the quantizerto an input of the discrete time integrator

Data conversion method based on scale-adjusted B-map

Provided is a highly accurate converter and the like that makes up for the instability of circuit elements, by focusing on a relationship between the Markov chain and &#x3b2; conversion. A converterthat determines the decoded value of a sample value x based on L-bit number b(i=1, . . . , L) includes a decoding sectionto determine the decoded value xfor &#x3b3;=1/&#x3b2; (where 1&#x3c;&#x3b2;&#x3c;2) using equation (eq 1). Further, the converteralso includes a matrix estimation sectionto determine the Markov transition matrix based on b. Unlike a conventional method that pays attention to the lower limit of an interval, the decoding sectionusing equation (eq 1) pays attention to the center of the interval, and this point is a significant difference. 

Converter, conversion method, program, and recording medium

An enciphering apparatus embodying this invention comprises chaos generation means for generating a real-valued sequence along a chaotic orbit in accordance with a predetermined number of first common keys and a predetermined nonlinear map, bit generation means for performing predetermined binarization on each real value in the generated real-valued sequence based on a predetermined number of second common keys to generate a binary sequence, and logic operation means for executing a predetermined logic operation on a binary sequence of an input plaintext and the generated keystream sequence bit by bit to generate a binary sequence of a ciphertext. For example, the first common keys are an initial seed of a nonlinear map and a value of a parameter k, and the bit generation means acquires plural pieces of binary data for each real value in the real-valued sequence using values indicated by a plurality of second keys as thresholds and obtains exclusive OR of those binary data.

Growing community of inventors

Fukuoka, Japan

Tohru Kohda