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:
Jun. 15, 2010
Filed:
Oct. 20, 2003
Paul Howard, Bristol, GB;
Paul Howard, Bristol, GB;
IPWireless, Inc., San Francisco, CA (US);
Abstract
An arrangement () and method for RF filtering in a Node B of a UMTS TDD system by providing: a DAC converter () converting digital signals to analog signals; providing a narrow band analogue channel filter () filtering the analog signals; and providing a digital pre-equaliser FIR filter () coupled before the DAC () to filter the digital signals, the digital pre-equaliser filter means substantially correcting for non linear phase response () non-ideality and amplitude response non-ideality () in the analogue channel filter (). This provides the following advantage(s): it enables 3GPP Node B co-location specifications to be met while providing both good transmit accuracy and acceptable ISI performance; and it allows filter centre frequency to be field tuned in software, permitting a basic RF single-channel filter to used with its centre frequency being field adjustable to a desired value centred on a UMTS channel.