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:
Nov. 27, 2001
Filed:
Feb. 18, 2000
Applicant:
Inventor:
Malcolm Paul Sellars, Cambridge, GB;
Assignee:
Adaptive Broadband Ltd., Cambridge, GB;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H04K 1/02 ; H04L 2/503 ; H04L 2/549 ;
U.S. Cl.
CPC ...
H04K 1/02 ; H04L 2/503 ; H04L 2/549 ;
Abstract
A precoding scheme for digital data transmission across multipath channels is described, which improves on existing methods of precoder stability. This precoding scheme uses radial reduction of unstable roots to stabilize the precoder. Furthermore, in a broadband access system in which the preceding scheme is used, all of the precoding and equalization is performed in the subscriber units. This eliminates the problems of equalization and training delays occuring at the base station, thus allowing rapid demodulation of data arriving at the base station for several disparate subscriber terminals units.