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. 25, 2000
Filed:
Jun. 20, 1996
Elbert L Turner, San Jose, CA (US);
Lockheed Martin Corporation, Bethesda, MD (US);
Abstract
Communication apparatus comprising a vector division multiple access communications system that uniquely extracts a selected communications link from a communications channel containing many simultaneous links. Each link is assigned a unique vector modulation coefficient using the transmit coefficient generator as its link connection address. The vector modulation coefficient establishes the phase and amplitude states of transmit and receive vector modulators employed in the transmitter and receiver, respectively. The receive vector modulator performs antipodal modulation of the link coefficient and remodulates the received modulated transmit waveform by removing the modulation that was applied by the transmit modulator. When a perfect match occurs, the receive modulator completely removes the modulation applied by the transmit modulator. Thus, a data demodulator following the receive vector modulator has no signal to demodulate and its output is therefore zero. Other than perfect matches between transmit and receive vector modulators result in output signals from the receiver data demodulator that are representative of a lack of match. When a data signal is added to the modulated transmit waveform generated by the transmit vector modulator and transmitter, the receive vector modulator no longer has a 100 percent correlation with the transmit vector modulator. The receiver vector modulator does not remove all of the signal modulation. The receive data demodulator then generates data output signals that represent the data signals transmitted by the transmitter.