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. 09, 2001
Filed:
Sep. 04, 1997
Michael D. Kotzin, Buffalo Grove, IL (US);
Kamyar Rohani, Grapevine, TX (US);
Walter J. Rozanski, Jr., Hurst, TX (US);
Motorola, Inc., Schaumburg, IL (US);
Abstract
Orthogonal transmit diversity is implemented by employing a data splitter (,) to subdivide channel information (,) into at least a first portion of bits (,) and a second portion of bits (,). Each portion is spread with its own Walsh code for eventual transmission to a mobile station via a predetermined carrier frequency. When the number of bits in the first and second portion (,) are small, separate Walsh codes are used to maintain orthogonality. When the number of bits in the first and second portion (,) are relatively large, a time-division multiplex transmission is used to maintain orthogonality. A controller (,) controls the subdivision of the channel information and also an interleaver (,) to further enhance the effects of the diversity transmission. Control information related to the subdivision is transmitted to the mobile station so the channel information can be accurately reconstructed prior to decoding.