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:
Feb. 22, 2005
Filed:
Dec. 21, 2000
Toshiyuki Okuyama, Tokyo, JP;
Toshiyuki Okuyama, Tokyo, JP;
NEC Corporation, Tokyo, JP;
Abstract
A transmission diversity detection system that detects the presence or absence of a STTD (Space-Time Transmit Diversity) transmission diversity by a simple arithmetic operation. The transmission diversity detection circuit notifies presence or absence of a transmission diversity of spread spectrum communication by modulation of a synchronization channel (SCH). The transmission diversity detection circuit includes arithmetic circuit for calculating a calculated value of C×S*+C*×S+C*×C, in first and second symbols in a predetermined number of series of slots with respect to a reception signal, taking a primary common pilot channel (CPICH) symbol with respect to the first symbol as C, a SCH symbol with respect to the first symbol as S, and a primary CPICH symbol with respect to the second symbol as C, taking a complex conjugate of the primary CPICH symbol Cas C*, a complex conjugate of SCH symbol Sas S*, and a complex conjugate of the primary CPICH symbol Cas C* and judgment circuit for making judgment whether transmission diversity is present or not depending upon positive or negative of the calculated value.