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:
Jul. 02, 2002
Filed:
Apr. 07, 1998
Fraser Murray Edwards, Bishop's Stortford, GB;
David Alan Brown, Bishop's Stortford, GB;
Nortel Networks Limited, St. Laurent, CA;
Abstract
A baseband signal modulator provides a phase and amplitude modulated carrier signal. First and second phase modulators each receive a common reference signal and derive therefrom a carrier signal frequency. The phase modulators each receive a respective pair of phase-encoded data signals so as to provide respective first and second phase-encoded carrier. The modulator outputs are summed to provide the phase and amplitude modulated carrier signal. Each phase modulator includes a respective phase locked loop incorporating an oscillator locked via the common reference signal to the carrier signal frequency, and a phase adder having a first input for receiving the carrier frequency signal and having second and third inputs for receiving the respective pair of data encoded signals.