| US 7,519,141 B2 | ||
| Method for converting a real signal into a complex signal | ||
| Michele Bargauan, Milan (Italy) | ||
| Assigned to M.B. International Telecom Cabs S.R.L., Brescia (Italy) | ||
| Filed on Feb. 05, 2001, as Appl. No. 9/775,492. | ||
| Claims priority of application No. MI2000A0636 (IT), filed on Mar. 24, 2000. | ||
| Prior Publication US 2001/0028688 A1, Oct. 11, 2001 | ||
| Int. Cl. H04L 23/00 (2006.01) | ||
| U.S. Cl. 375—377 | 13 Claims |
| 1. A method for converting a real signal into a complex signal inherently in quadrature, comprising the step of:
starting from a real signal to be converted,
adding to said real signal, designed to be converted into a complex signal, a signal whose frequency is four times the band-center
frequency of said real signal to be converted;
selecting, from said sum signal, a first component and a second component which are in phase and in quadrature;
removing components below a given level from said first and second components in phase and in quadrature, in order to obtain
a first and a second signal component at DC zero level, said removing step being performed by threshold circuits;
multiplying said DC zero level components respectively by 1 and −1, with a frequency equal to the center frequency of said
signal to be converted in input, obtaining a complex signal with an inherent quadrature,
wherein said selection step is performed by selection means, which send signals to said threshold circuits with a frequency
which is twice said band-center frequency of the signal to be converted.
|