The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 09, 2001
Filed:
Dec. 14, 1998
Tom Jackson, Frederick, MD (US);
Dave Roos, Boyds, MD (US);
Hughes Electronics Corporation, El Segundo, CA (US);
Abstract
Circuitry for modulating the frequency of a carrier signal with data signals for high frequency radio transmission, which includes a MSK generator for generating a series of in-phase (I) signals and an associated series of quadrature (Q) signals corresponding to the data signals to be transmitted. A first shift register receives binary input from the I signals generated with the MSK generator, the binary input being indicative of the sign orientation of the generated I signals from the MSK generator. A second shift register receives binary input from the Q signals generated with the MSK generator, with the binary input being indicative of the sign orientation of the generated Q signals from the MSK generator. A first finite impulse response (FIR) filter is provided for summing a series of delayed binary input received from the I signals at the first shift register to generate filtered I signals, and likewise a second FIR filter is provided for summing a series of delayed binary input received from the Q signals to generate filtered Q signals. A local oscillator (LO) generates the carrier signal, and an I/Q modulator is used for modulating the phase shift of the LO signal according to the filtered I signals and the filtered Q signals from the first and second FIR filters respectively.