United States Patent 7,826,554
Haque , et al. November 2, 2010
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Digital transmitter
Abstract
In a digital Cartesian modulation transmitter, an encoder generates 1-bit logic signals from in-phase and quadrature signals. A single bit digital modulator multiplexes the 1-bit logic signals for Cartesian I/Q modulation. A digital upconverter (DUC) upconverts the multiplexed 1-bit logic signal. A digital power amplifier (DPA) generates a radio frequency (RF) signal based on the upconverted signal. In a digital polar modulation transmitter, an encoder converts a magnitude signal to a first 1-bit logic signal. A digital phase modulator modulates a carrier using a phase signal to generate a second 1-bit logic signal. A DUC upconverts the second 1-bit logic signal. A first-in first-out (FIFO) memory stores the first 1-bit logic signal. A combiner combines angle information contained in the second 1-bit logic signal with magnitude information contained in the first 1-bit logic signal stored in the FIFO memory. A DPA generates an RF signal based on the combined signal.
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Inventors: Haque; Tanbir (Jackson Heights, NY), Kazakevich; Leonid (Plainview, NY)
Assignee: InterDigital Technology Corporation (Wilmington, DE)
Appl. No.: 11/685,003
Filed: March 12, 2007
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Related U.S. Patent Documents
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Application Number Filing Date Patent Number Issue Date
60781703 Mar., 2006
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Current U.S. Class: 375/297
Current International Class: H04K 1/02 (20060101)
Field of Search: 375/247,261,295,297,308
