Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2005-12-29
2009-06-02
Tse, Young T. (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C375S296000, C330S149000, C455S114300
Reexamination Certificate
active
07542519
ABSTRACT:
An RF transmitter (10) is configured to transmit either wideband multichannel modulations or narrowband multichannel modulations in a variety of licensed frequency bands (70) using a single set of hardware. For narrowband modulations, a digital IF upconversion stage is performed so that, after upconversion to RF, image signals74are sufficiently displaced from the licensed frequency band (70) so as to be filtered off. For wideband modulations, no IF modulation stage occurs, and a direct upconversion takes place from baseband to RF. LO leakage is cancelled using a negative feedback loop that combines a digital DC signal with a communication signal (26, 52) prior to a direct or final analog upconversion stage (62).
REFERENCES:
patent: 4878029 (1989-10-01), Saulnier et al.
patent: 4888557 (1989-12-01), Puckette, IV et al.
patent: 4902979 (1990-02-01), Puckette, IV
patent: 5049832 (1991-09-01), Cavers
patent: 5454007 (1995-09-01), Dutta
patent: 5559807 (1996-09-01), van den Heuvel et al.
patent: 6766157 (2004-07-01), Hunzeker et al.
patent: 6973297 (2005-12-01), Manku et al.
patent: 2001/0024475 (2001-09-01), Kumar
patent: 2002/0186783 (2002-12-01), Opas et al.
patent: 2003/0156658 (2003-08-01), Dartois
patent: 2003/0179831 (2003-09-01), Gupta et al.
patent: 2005/0058220 (2005-03-01), Nagatani et al.
patent: 2005/0101269 (2005-05-01), Dale et al.
patent: 2005/0136860 (2005-06-01), Subasic et al.
patent: 2005/0162225 (2005-07-01), Suzuki et al.
patent: 2005/0163252 (2005-07-01), McCallister et al.
Santamaria, Ibanez, Lazaro, Pantaleon, Vielva “Modeling Nonlinear Power Amplifiers in OFDM Systems from Subsampled Data: A Comparative Study Using Real Measurements” Feb. 20, 2003.
Park, Woo, Raich, Kenney, Zhou “Adaptive Predistortion Linearization of RF Power Amplifiers Using Lookup Tables Generated from Subsampled Data” Georgia Inst. of Tech. 2002.
Ibanez-Diaz, Pantaleon, Santamaria, Fernandez, Martinez “Nonlinearity Estimation in Power Amplifiers Based on Subsampled Temporal Data” IEEE 2001.
Cavers “The Effect of Quadrature Modulator and Demodulator Errors on Adaptive Digital Predistorters for Amplifiers Linearization” IEEE Transactions on Vehicular Tech. 1997.
Plante, Wong “Opening Base Station Architectures Part 1: An Inside Look at OBSAI” Altera Corp., http://www.commsdesign.com/printableArticle/?articleID=50500130, 2003.
Feulner “Direct Up-Conversion Lowers Base-Station Costs” Inst. of Physics, Ltd. Apr./May 2005.
“Aero Ile Transceiver for GSM, GPRS, and EDGE” Silicon Laboratories, 2005.
“Wireless Infrastructure Solutions Guide: Amplifiers, ASIC, Clock Distribution Circuits, Data Converters, Digital Signal Processors, etc” Texas Instruments, 2Q 2005.
Crestcom, Inc.
Gresham Lowell W.
Meschkow Jordan M.
Nair Gouri G.
Tse Young T.
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