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:
Mar. 18, 1997
Filed:
Jan. 02, 1996
Frank Chethik, Palo Alto, CA (US);
Loral Aerospace Corp., New York, NY (US);
Abstract
This invention pertains to a method for producing high power microwave transmission signals conveying one of a plurality of symbols, wherein a symbol represents a plurality of bits, and also to a modulating array transmitter that operates in accordance with the method. The method includes a first step of applying j bits to a data storage device to address the data storage device to output N bits to N/2 QPSK modulators. Each of the N/2 QPSK modulators receives a subset (a pair) of the N bits. Each of the bit pairs specifies one of up to four phase shifts. Within each of the N/20 PSK modulators, a next step phase modulates a reference (e.g., local oscillator) signal in accordance with a phase shift specified by the received pair of bits. A next step amplifies the outputs of each of the N/2 QPSK modulators to produce respective amplified QPSK modulated signals. A further step combines the amplified OPSK modulated signals by vector addition to produce one of a plurality of symbols, wherein the produced symbol represents a value of the j (even number) input bits. Also disclosed is a BPSK embodiment of the invention, wherein there are N BPSK modulators, each receiving one of the N bits.