Tamagawa University and Tamagawa Academy

Tamagawa Academy & University

Fumio Futami

Ken Tanizawa

The present invention addresses the problem of improving data transmission/reception equipment and transmission efficiency per hour. A light output unitof a light transmitting/receiving device outputs n optical signals (where n is an integer value of 2 or more), each with a different wavelength, based on n respective pieces of data to be transmitted. From the n optical signals, a multiplexerproduces an optical signal multiplexed with respect to wavelength. From the multiplexed optical signal, an encryption unitproduces an encrypted signal by performing multi-level modulation on the basis of a Y-00 protocol. The problem is solved thereby.

Signal processing device

The present invention addresses the problem of providing a signal process in which a countermeasure against eavesdropping over a physical layer in a wireless communication is performed. An optical signal generation unitgenerates, as an optical signal, multivalued information that is in a multivalued state and is based on prescribed data. An E/O conversion unitconverts the optical signal to an electrical signal. An optical signal amplification unitamplifies the optical signal. An O/E conversion unitconverts the optical signal to an electrical signal. A radio wave transmission unittransmits, as a radio wave, the multivalued information converted into the electrical signal. The problem is solved thereby.

Signal processing system

The purpose of the present invention is to improve signal modulation resolution. A coarse phase modulation elementA modulates a signal into any of M(Mis an arbitrary integer) patterns in a first range. Fine phase modulation elementsB-throughB-(k−1) respectively modulate the signal into any of Mthrough Mk (Mthrough Mk are arbitrary integers that are independent of each other and M) patterns in a second range through k-th range (k is an integer of 2 or greater). A coarse DACA and DACsB-throughB-(k−1) perform control such that the second range through k-th range become narrower than the first range.

Growing community of inventors

Tokyo, Japan

Fumio Futami