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:
May. 30, 2000
Filed:
Jan. 30, 1998
Kjell Ostman, Salo, FI;
Tero Kuusinen, Turku, FI;
Nokia Mobile Phones Limited, Espoo, FI;
Abstract
The object of the invention is a method and a circuit arrangement for the processing of a signal in connection with its reception, when the signal conforms to one or more system specifications. The invention is preferably applied in receivers operating on two frequency ranges or in receivers intended to be used in two radio communication systems. Preferably the receiver is a part of a mobile station or a base station of a cellular system. An inventive idea is that before the analog-to-digital converter (324) the intermediate frequency signal (IF1, IF2) is processed on a wide band (310, 320) so that both the narrow band signal and the broadband signal are on the pass-band of the signal line. Then, when a narrow band signal is received, the signal also contains signals outside the band of the payload signal. Then the analog-to-digital conversion (324) is performed on a conversion range with a sufficiently wide conversion dynamics, so that also the signals outside the band can be converter without causing distortion components on the received band. The bandwidth is eventually restricted by digital signal processing (326). In a receiver according to the invention it is not necessary to filter the signal depending on its bandwidth, so there is no need for intermediate frequency filters for each system.