The Boeing Company

Teledyne Licensing, LLC

Yefim Samullovich Poberezhskiy

Igor Elgorriaga

Xinyu Wang

Robert Paul Higgins

Michael S Foster

Paul R Norris

Marcus R Gahler

Brian J Hatley

Embodiments of the disclosure provide methods, apparatus, and articles allowing two nodes to communicate in a slot-based direct sequencing spreading communication system. Both a preamble sequence and a payload data spreading PN sequence are generated from the Time of Day and a given user code. Generated sequences are synchronized between two communicating nodes to allow slot-based DSSS communication to take place. Generated sequences also change dynamically from slot to slot to provide waveform security.

Method and device of generating time-varying preamble sequence and pseudorandom noise (PN) binary sequence in direct sequence spread spectrum (DSSS) communications

Methods, apparatus, and systems for alternating quadratures differential binary phase shift keying (AQDBPSK) modulation and demodulation radically increase overall energy efficiency of a communication system due to the combined effect of efficient utilization of transmitter power, high noise immunity of modulation and demodulation, fast synchronization, and simple implementation.

Apparatus for performing alternating quadratures differential binary phase shift keying modulation and demodulation

A system for synchronizing a spreading sequence transmitted during a plurality of time slots includes a plurality of communication stations. Each communication station includes: (a) a control unit; (b) a spreading sequence unit for originating the spreading sequence; (c) at least one of a transmitter and a receiver; (d) at least one delay unit responding to the control unit for imparting a first delay to the spreading sequence presented to the transmitter unit and responding to the receiver unit for imparting a second delay to the spreading sequence presented to the receiver unit; and (e) a synchronizing sequence generator coupled with the transmitter unit. The synchronizing sequence unit in a first station presents a synchronizing sequence for transmission accompanying spread information transmitted during selected time slots. A receiver unit in a second station employs the synchronizing sequence in cooperation with the spreading sequence for despreading received spread information.

System, apparatus and method for synchronizing a spreading sequence transmitted during a plurality of time slots

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Thousand Oaks, CA, United States of America

Yefim Samullovich Poberezhskiy