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. 02, 2012
Filed:
Jun. 16, 2009
Haruo Nakano, Yokohama, JP;
Kazuyuki Hori, Tokyo, JP;
Masanori Taira, Yokohama, JP;
Takahiro Chiba, Yokohama, JP;
Yasuyuki Magara, Fujisawa, JP;
Haruo Nakano, Yokohama, JP;
Kazuyuki Hori, Tokyo, JP;
Masanori Taira, Yokohama, JP;
Takahiro Chiba, Yokohama, JP;
Yasuyuki Magara, Fujisawa, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
Even if a receiver has a normal gain and a lowered intermodulation distortion characteristics, a fault detection is possible. A test signal transmitter sends a test signal having at least two frequencies to a radio receiver through a coupler. A digital signal processing section receives a signal which includes an IM3 component generated by the radio receiver and measures the electric power of fundamental wave components and the IM3 component. Then, the digital signal processing section calculates the gain of the radio receiver and IIP3, which is an index for intermodulation distortion characteristics, of the radio receiverfrom the calculated electric power. A base station control section determines whether the gain and IIP3 of the radio receiver fall in predetermined ranges to determine whether the radio receiver works normally or has a fault.