Method and a circuit arrangement for the processing of received

Details Method and a circuit arrangement for the processing of received Method and a circuit arrangement for the processing of received

1998-01-30

2000-05-30

Pham, Chi H.

Pulse or digital communications

Receivers

375377, 455133, H03K 900, H04L 2706, H04L 2714, H04L 2722

Patent

active

06069923&

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.

REFERENCES:
patent: 5291474 (1994-03-01), Ikonen et al.
patent: 5301367 (1994-04-01), Heinonen
patent: 5359156 (1994-10-01), Chan et al.
patent: 5390168 (1995-02-01), Vimpari
patent: 5471652 (1995-11-01), Hulkko
patent: 5519885 (1996-05-01), Vaisanen
patent: 5630218 (1997-05-01), Muto

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