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:
Jan. 29, 2008
Filed:
Mar. 24, 2003
Debarag Narayan Banerjee, Sunnyvale, CA (US);
Pascal Gilles Renucci, Sunnyvale, CA (US);
Karim Nassiri Toussi, Belmont, CA (US);
Debarag Narayan Banerjee, Sunnyvale, CA (US);
Pascal Gilles Renucci, Sunnyvale, CA (US);
Karim Nassiri Toussi, Belmont, CA (US);
National Semiconductor Corporation, Santa Clara, CA (US);
Abstract
A mobile device detects downlink transmit diversity. Slot and frame timing knowledge and a downlink scrambling code are applied to pilot and synch channels of the signal. An algorithm suited for the diversity case and an algorithm suited for the non-diversity case are utilized. The output of the diversity algorithm is compared to the output of the non-diversity algorithm. The output yielding the highest energy determines whether downlink transmit diversity is applied. The detection algorithms used in both the diversity and non-diversity cases use phasors to indicate the phase difference between two channels. This phase difference is the basis for determining diversity usage.