Direct conversion receiver

Details Direct conversion receiver Direct conversion receiver

2007-05-15

2007-05-15

Bocure, Tesfaldet (Department: 2611)

Pulse or digital communications

Receivers

C455S324000

Reexamination Certificate

active

10386603

ABSTRACT:
To solve such a problem of a conventional direct conversion receiver that an image rejection ratio is insufficient owing to analog processing employed to reject an image, the present invention provides such a direct conversion receiver that the image can be rejected by digital signal processing to improve the image rejection ratio and also reduce the hardware load and the processing load. A HILBERT filter of a digital signal processing section shifts a quadrature component digital signal by 90° by HILBERT conversion to provide an output, while a delay circuit delays an in-phase component digital signal by the same delay time as a delay time by the HILBERT filter to provide an output, both of which outputs undergo addition or subtraction at an adder to have the image rejected there and then enter a complex frequency converter, where an offset provided at a local oscillator is removed by frequency conversion processing to output the in-phase component and quadrature component signals.

REFERENCES:
patent: 4464770 (1984-08-01), Maurer et al.
patent: 5826180 (1998-10-01), Golan
patent: 5999802 (1999-12-01), Aschwanden
patent: 6427068 (2002-07-01), Suominen
patent: 6563887 (2003-05-01), Casagrande
patent: 6608999 (2003-08-01), Jakobsson
patent: 2002/0150173 (2002-10-01), Buda
patent: 2003/0125000 (2003-07-01), Gharpurey et al.
patent: 10-070482 (1998-03-01), None

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