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:
Jun. 24, 2003
Filed:
Jan. 22, 1999
Paul K. Lee, Lexington, MA (US);
Systems Information and Electronic Systems Integration Inc., Nashua, NH (US);
Abstract
A system for increasing data transmission capacity over a wireless mobile link while at the same time providing improved jamming resistance utilizes discrete trellis-coded modulation involving frequency hopping individual symbols, along with encoding the phase of a symbol as a frequency offset to the hopped carrier frequency. This modulation system permits coherent demodulation in which both phase and amplitude of a symbol is robustly decoded and in which each phase of a quadrature amplitude modulated signal is decoded by the detected frequency offset, thus to provide reliable recovery of phase in the demodulation section. The resulting system improves spectrum efficiency and permits fast frequency hopping for improved jamming resistance, with the utilization of frequency offset coding permitting the coherent demodulation that improves the error-rate without the introduction of additional reference bits.