Multiplex communications – Generalized orthogonal or special mathematical techniques – Plural diverse modulation techniques
Reexamination Certificate
2008-09-09
2008-09-09
Orgad, Edan (Department: 2619)
Multiplex communications
Generalized orthogonal or special mathematical techniques
Plural diverse modulation techniques
C370S205000, C370S206000, C375S297000
Reexamination Certificate
active
10168894
ABSTRACT:
A transmitter for sending signals over wireless channels and a method of sending signals over wireless channels are described. The transmitter and the method are used to determine a transfer characteristic of an amplifier (8) in the transmitter. Symbols in the OFDM signals to be transmitted are multiplied by test signals at predefined points in time to compare the OFDM symbol, which has been multiplied by the test signal, upstream and downstream from the amplifier to determine the transfer characteristic of the amplifier (8). This transfer characteristic of the amplifier (8) is used by a predistorter (4) to predistort the signals according to this transfer characteristic. The test signal, which is generated by a signal generator (13), is input into a symbol of the fast information channel, the test signal having an amplitude which drives the multiplied symbol into the saturation range of the amplifier (8) with regard to its amplitude.
REFERENCES:
patent: 4329655 (1982-05-01), Nojima et al.
patent: 4615040 (1986-09-01), Mojoli et al.
patent: 5164678 (1992-11-01), Puri et al.
patent: 5262734 (1993-11-01), Dent et al.
patent: 5877653 (1999-03-01), Kim et al.
patent: 6166601 (2000-12-01), Shalom et al.
patent: 6252912 (2001-06-01), Salinger
patent: 6771708 (2004-08-01), Suga et al.
patent: 2002/0021764 (2002-02-01), Posti
patent: 2002/0079965 (2002-06-01), Maniwa et al.
patent: 2003/0058960 (2003-03-01), Lee
patent: 2006/0067426 (2006-03-01), Maltsev et al.
patent: 33 07 309 (1984-09-01), None
patent: WO 99 45640 (1999-09-01), None
“Linearisation of RF multicarrier amplifiers using Cartesian feedback” by Johansson et al Electronics Letters vol. 30 Jul. 7, 1994 No. 14, pp. 1110-1112.
M. Schrader and N. Hentati, “Reduktion von Ausserbandstrahlung von Sendestufen im DAB-COFDM-System [Reducing out-of-band radiation of transmitter stages in the DAB-COFDM system],” OFDM Fachgespräche, Sep. 1998, Braunschweig (conference).
Harms Lars
Hentati Nabil
Lochau Mirko
Schrader Marc
Ho Chuong
Kenyon & Kenyon LLP
Orgad Edan
Robert & Bosch GmbH
LandOfFree
Transmitter for transmitting signals over radio channels and... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Transmitter for transmitting signals over radio channels and..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Transmitter for transmitting signals over radio channels and... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3927919