Pulse or digital communications – Transmitters
Reexamination Certificate
2006-08-31
2010-06-08
Fan, Chieh M (Department: 2611)
Pulse or digital communications
Transmitters
C375S297000
Reexamination Certificate
active
07733976
ABSTRACT:
Circuits and methods are provided for use in a wireline or wireless transmitter to complement the digital generation of non-constant envelope modulation signals therein. A digital signal processor is configured for deconstructing a predetermined signal having an undesirable property into one or more fragment signals which do not have the undesirable property. In a preferred embodiment the predetermined signal is preconditioned by applying a preconditioning deconstruction process to another signal from which the predetermined signal is derived, whereby that other signal is deconstructed into one or more preconditioned fragment signals having an improved property over the other signal. For OFDM modulation schemes this undesirable property may be a relatively high peak-to-average power ratio. Signals formed from the fragment signals are subject to conversion to analog signals and processing by power efficient, dynamic-range limited analog circuits i.e. S Class power amplifiers (and, for wireless applications, low compression-point up-converters), before being recombined for transmission.
REFERENCES:
patent: 5467367 (1995-11-01), Izumi et al.
patent: 5539775 (1996-07-01), Tuttle et al.
patent: 5598154 (1997-01-01), Wilson et al.
patent: 5623485 (1997-04-01), Bi
patent: 5636247 (1997-06-01), Kamerman et al.
patent: 5659272 (1997-08-01), Linguet
patent: 5666383 (1997-09-01), Huang et al.
patent: 5687166 (1997-11-01), Natali et al.
patent: 5771224 (1998-06-01), Seki et al.
patent: 5838717 (1998-11-01), Ishii et al.
patent: 5848107 (1998-12-01), Philips
patent: 5862457 (1999-01-01), Winters
patent: 5990738 (1999-11-01), Wright et al.
patent: 6128350 (2000-10-01), Shastri et al.
patent: 6147553 (2000-11-01), Kolanek
patent: 6175550 (2001-01-01), Van Nee
patent: 6175551 (2001-01-01), Awater et al.
patent: 6178158 (2001-01-01), Suzuki et al.
patent: 6198764 (2001-03-01), Schuermann et al.
patent: 6205220 (2001-03-01), Jacobsen et al.
patent: 6215813 (2001-04-01), Jones et al.
patent: 6252908 (2001-06-01), Tore
patent: 6424681 (2002-07-01), Tellado et al.
patent: 6556557 (2003-04-01), Cimini et al.
patent: 6690233 (2004-02-01), Sander
patent: 6747946 (2004-06-01), Kaneko et al.
patent: 6751267 (2004-06-01), Schill et al.
patent: 6845082 (2005-01-01), Bourget et al.
patent: 6928084 (2005-08-01), Cimini et al.
patent: 7002904 (2006-02-01), Jung
patent: 7042927 (2006-05-01), Wight
patent: 7127005 (2006-10-01), Wight
patent: 7342978 (2008-03-01), Feng et al.
patent: 2002/0047745 (2002-04-01), Kolanek
patent: 2002/0061068 (2002-05-01), Leva et al.
patent: 2003/0043933 (2003-03-01), Kintis
patent: 2064975 (1999-07-01), None
patent: 19744428 (1999-02-01), None
patent: 0735731 (1996-10-01), None
patent: 0562529 (1999-02-01), None
patent: 0735731 (2000-09-01), None
patent: 1195962 (2002-04-01), None
patent: 8-274748 (1996-10-01), None
patent: 03077490 (2003-09-01), None
Babak et al., “Performance and Implementation of Clustered-OFDM for Wireless Communications”, pp. 1-17.
Sundstrom, “The Effect of Quantization in a Digital Signal Component Separator for LINC Transmitters”, IEEE Transactions on Vehicular Technology, vol. 45, No. 2, May 1996, pp. 346-352.
Haskins, “Diode Predistortion Linearization for Power Amplifier RFICs in Digital Radios”, Thesis submitted to the faculty of the Virginia Polytechnic Institute and State University, Apr. 17, 2000, Blacksburg, VA.
Stengel et al., “LINC Power Amplifier Combiner Method Efficiency Optimization”, IEEE Transactions on Vehicular Technology, vol. 49, No. 1, Jan. 2000, pp. 229-234.
Casadevall et al., “Performance Analysis of QAM Modulations Applied to the LINC Transmitter”, IEEE Transactions on Vehicular Technology, vol. 42, No. 4, Nov. 1993, pp. 399-406.
Sundstrom, “Digital RF Power Amplifier Linearisers, Analysis and Design”, Department of Applied Electronics, Lund University, Aug. 1995.
Shi et al., “A 200MHz IF BiCMOS Chip for Linear LINC Transmitters”, Analog and RF Group, CCCD, Department of Applied Electronics, Lund University, undated.
Xhang et al., “Gain and Phase Error-Free LINC Transmitter”, IEEE Transactions on Vehicular Technology, vol. 49, No. 5, Sep. 2000, pp. 1986 to 1994.
Sundstrom, “Spectral Sensitivity of LINC Transmitters to Quadrature Modulator Misalignments”, IEEE Transactions on Vehicular Technology, vol. 49, No. 4, Jul. 2000, pp. 1474 to 1487.
Sundstrom et al., “Quantization Analysis and Design of a Digital Predistortion Linearizer for RF Power Amplifiers”, IEEE Transactions on Vehicular Technology, vol. 45, No. 4, Nov. 1996, pp. 707-719.
Langridge et al., “A Power Re-Use Technique for Improved Efficiency of Outphasing Microwave Power Amplifiers”, IEEE Transactions on Microwave Theory and Techniques, vol. 47, No. 8, Aug. 1999, pp. 1467 to 1470.
Sundstrom et al., “Effects of Reconstruction Filters in Digital Predistortion Linearizers for FR Power Amplifiers”, IEEE Transactions on Vehicular Technology, vol. 44, No. 1, Feb. 1995, pp. 131 to 139.
Cox, “Linear Amplification with Nonlinear Components”, IEEE Transactions on Communications, Dec. 1974, pp. 1942 to 1945.
Tufvesson et al., “Preamble-based Time and Frequency Synchronization for OFDM Systems”. Department of Applied Electronics, Lund University, Sweden, Sep. 1999.
Jankiraman et al., “A Novel Algorithmic Synchronisation Technique for OFDM based Wireless Multimedia Communications”, Centre for Wireless Personal Communication, IRCTR, Telecommunications and Traffic Systems Group, Faculty of Information Technology and Systems, Delft University of Technology, undated.
Eberlee et al., A Digital 72Mb/s 64-QAM OFDM Transceiver for 5GHz Wireless LAN in 0.18 μmCMOS, ISSCC 2001/Session 21/Signal Processing for Communications, Feb. 7, 2001.
Lee et al., “A New Symbol Timing Recovery Algorithm for OFDM Systems”, Department of Electronic and Electrical Engineering, Pohang University of Science and Technology, Undated.
Li et al., “Carrier Frequency Offset Estimation for OFDM-Based WLANs”, IEEE Signal Processing Letters, vol. 8, No. 3, Mar. 2001, pp. 80-82.
Torrance et al., “Comparative Study of Pilot Symbol Assisted Modem Schemes”, Proceedings of Radio Receivers and Associated Systems Conference, RRAS '95, Sep. 26-28, 1995, Bath, UK, pp. 36-41.
Hsu et al., Design of an OFDM Receiver for High-Speed Wireless LAN, Department of Electrical Engineering and Graduate Institute of Electronic Engineering, National Taiwan University, 2001.
Gardner, “Interpolation in Digital Modems—Part 1: Fundamentals”, IEEE Transactions on Communications, vol. 41, No. 3, Mar. 1993, pp. 501 to 507.
Hetzel et al., “LINC Transmitter”, Electronics Letters, May 9, 1991, vol. 27, No. 10, Feb. 28, 1991, pp. 844 to 846.
Huq et al., “ML NDA Carrier Phase Recovery for OFDM Systems”, Texas Instruments, Inc., Semiconductor Group, DSP Applications, and Department of Electrical Engineering, Texas A&M University, Undated.
Matić et al., “OFDM Synchronisation based on the Phase Rotation of Sub-carriers”, Telecommunications and Traffic Control System Group, Delft University of Technology, the Netherlands; International Research Centre of Telecommunication and Radar, Delft University of Technology, the Netherlands; Research Centre of Telecommunications, Hilversum, the Netherlands; Aalborg University, Aalborg, Denmark; I2S-CNRS, University of Sophia-Antipolis, France, Undated.
Van De Beek et al., “A Time and Frequency Synchronization Scheme for Multiuser OFDM”, paper presented in part at the 48th IEEE Vehicular Technology Conference, VTC '98, May 18-21, Ottawa, Ontario, Canada.
Dr. A Bateman, “The Combined Analogue Locked Loop Universal Modulator (CALLUM)”, Centre for Communications Research, University of Bristol, 1992.
Erup et al., “Interpolation in Digital Modems—Part III:
Fan Chieh M
Fotakis Aristocratis
Stolowitz Ford Cowger LLP
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