Pulse or digital communications – Transmitters – Antinoise or distortion
Reexamination Certificate
2007-03-27
2007-03-27
Kumar, Pankaj (Department: 2611)
Pulse or digital communications
Transmitters
Antinoise or distortion
C333S018000, C333S150000
Reexamination Certificate
active
10448148
ABSTRACT:
A CDMA base station transmitter employing the Kahn envelope-elimination-and-restoration technique includes a switching amplifier adapted to linearly amplify the low-level baseband signal derived from the digital amplitude information portion of the digital CDMA signal to be transmitted downlink. In order to achieve the wide bandwidth and high dynamic range needed to linearly amplify the low-level baseband signal derived from the digital amplitude portion of the CDMA signal, a truncating circuit truncates a predetermined number of the least significant bits of each word of the digital amplitude portion before the amplitude portion is converted to a low-level baseband signal and is amplified by the switching amplifier. High resolution is restored to the amplified output by a power-dissipating post regulator at the output of the switching amplifier.
REFERENCES:
patent: 3900823 (1975-08-01), Sokal et al.
patent: 4546342 (1985-10-01), Weaver et al.
patent: 5767900 (1998-06-01), Tanji et al.
patent: 6178186 (2001-01-01), Baker et al.
patent: 6236267 (2001-05-01), Anzil
patent: 6292054 (2001-09-01), Ma et al.
patent: 6686957 (2004-02-01), Johnson et al.
patent: 2002/0057729 (2002-05-01), Farbod et al.
Kahn, Leonard R., “Single-Sideband Transmission by Envelope Elimination and Restoration”,Proc. IRE., vol. 40, No. 7, (Jul. 1952), pp. 803-806.
Raab, F. H, et al, “High-Efficiency Single-Sideband HF/VHF Transmitter Based Upon Envelope Elimination and Restoration”,HF Radio Systems and Techniques, (Jul. 4-7, 1994), IEE Conf. Publ. No. 392, pp. 21-25.
Raab, F. H., et al, “High-Efficiency L-Band Kahn-Technique Transmitter”,IEEE MTT-S Digest, WE2C-5, (1998), pp. 585-588.
Stiebel, Christoph, et al, “New Concept of a Hybrid Amplifier for Driving Piezoelectric Actuators”,1st IFAC-Conference on Mechatronic Systems. Darmstadt, Germany, (Sep. 18-20, 2000), pp. 379-384.
Rauh Michael John
Whitacre Robert T.
Ejaz Naheed
Guery Stephen M.
Kumar Pankaj
Lucent Technologies - Inc.
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