The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 19, 2004
Filed:
May. 12, 2000
Yoshihiro Imajo, Eniwa, JP;
Masaru Nara, Hachiouji, JP;
Kokusai Electric Co., Ltd., Tokyo, JP;
Abstract
An optical transmission system for mobile communication compensates for disadvantages of the star type and the multicipital type systems. In the system, a radio modem for per forming modulation/demodulation between a circuit frequency electrical signal and a radio frequency electrical signal is connected to a network through an electrical signal transmission cable, a central station for performing conversion between a radio frequency electrical signal and an optical signal is connected to a relay-transmitting station for distributing and coupling optical signals through downward and upward optical fiber cables, a plurality of terminal stations for performing radio communication with a mobile communication unit and conversion between an electrical signal and an optical signal are connected to the relay-transmitting station through downward and upward optical fiber cables, the central station is connected with the relay-transmitting station by a small number of optical fiber cables, and the relay-transmitting station is connected with a plurality of terminal stations by optical fiber cables so that the terminal stations are independent from each other.