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:
Sep. 18, 2001
Filed:
Apr. 04, 2000
Yasushi Takatori, Kanagawa, JP;
Keizo Cho, Kanagawa, JP;
Kentaro Nishimori, Kanagawa, JP;
Toshikazu Hori, Kanagawa, JP;
Nippon Telegraph and Telephone Corporation, Tokyo, JP;
Abstract
An adaptive array antenna system for stable directivity control and waveform equalization even under poor multipath environment is provided. An output of antenna elements (A,-A,n) is weight combined (A,), and is output through automatic frequency control (A,) and fractionally spaced adaptive transversal filter (A,) which have real number weights. Weight combination (A,) is initially carried out with weights for an eigen vector beam for the maximum eigen vector of the correlation matrix R,of a receive signal After carrier synchronization and timing synchronization between a receive signal, and an A/D converter and a fractionally spaced transversal filter are established by the automatic frequency control and the fractionally spaced transversal filter, the weight in the weight combiner (A,) is switched to minimum mean square error (MMSE) weight. Sampling rate for A/D conversion under an eigen vector beam forming is higher than twice of that of transmission rate, with asynchronous timing to a receive signal.