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:
Apr. 08, 2003
Filed:
Feb. 05, 2001
Svante Signell, Vällingby, SE;
Thorsten Schier, Uppsala, SE;
Telefonaktiebolaget LM Ericsson (publ), Stockholm, SE;
Abstract
A base station in a radio telecommunication system, transforms real digital wideband high-frequency signals into a set of complex digital baseband signals and vice versa. The base station receives a set of complex digital baseband signals having an “I” and a “Q” components. A portion of these signals are modulated and then converted into complex digital high-frequency signals. The complex digital high-frequency signals are then filtered via bilinear digital ladder bandpass filters to retrieve real digital narrowband high-frequency signals. The outputs of these filters are the same corresponding “I” and “Q” components at the narrowband frequencies. These signals are further combined to form real digital wideband high-frequency signals. Finally, the combined signals are converted through a D/A converter to real analog wideband high-frequency bandpass signals.