Pulse or digital communications – Transmitters – Quadrature amplitude modulation
Reissue Patent
2011-01-18
2011-01-18
Kim, Kevin Y (Department: 2611)
Pulse or digital communications
Transmitters
Quadrature amplitude modulation
Reissue Patent
active
RE042043
ABSTRACT:
A radio frequency transmitter, of the type supplied with two signals in baseband and in quadrature, I(nT) and q(nT), which are images from two binary streams representing information to be transmitted, 1) provides a first transposition into the digital domain, at an intermediate frequency ω0, for the baseband signals and generates, by combination, two signals of intermediate frequency in quadrature, 2) provides a second transposition into the analog domain, after multiplication by a frequency ω1, followed by a summation of the two signals at intermediate frequency and in quadrature, in such a way that a resultant signal is generated which is found finally around a frequency ω2, where ω2=ω0+ω1. In an advantageous variant, the radio frequency transmitter additionally digitally compensates gain and phase imperfections of the direct conversion.
REFERENCES:
patent: 5351016 (1994-09-01), Dent
patent: 5748623 (1998-05-01), Sawahashi et al.
patent: 6298096 (2001-10-01), Burgin
patent: 0 692 867 (1996-01-01), None
patent: 98 11665 (1998-03-01), None
French Search Report; French Application No. 9903768; Prepared Nov. 26, 1999.
LandOfFree
Radiofrequency transmitter with a high degree of integration... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Radiofrequency transmitter with a high degree of integration..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Radiofrequency transmitter with a high degree of integration... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2690980