Vencore Labs, Inc.

Perspecta Labs Inc.

William Harvey Johnson

Kiran Meghashyam Rege

Achilles George Kogiantis

Joseph C Liberti

Anthony A Triolo

A system and method for secure communications is disclosed which includes a processor(s) of a first appliqu&#xe9; spreading an uplink signal of a user from user equipment, where the first appliqu&#xe9; is coupled to the user equipment, and where the user equipment is connected to a mobile network. The processor(s) frequency shifts the spread uplink signal to maintain orthogonality over the mobile network.

Spread spectrum signature reduction

A method of estimating and compensating for Doppler frequency shifts includes providing an accurate reference device for generating an accurate reference frequency in a Doppler estimation and compensation (DEC) system, the DEC system being electrically connected to a user device. The DEC system receives one of a downlink signal from a base station and an uplink signal from the user device. The one of the downlink signal and the uplink signal is compared to the accurate reference frequency. An estimate of a Doppler frequency shift associated with the one of the downlink signal and the uplink signal is determined. An offset Doppler frequency shift of opposite sign as the Doppler frequency shift is added to the one of the downlink signal and uplink signal to provide a compensated signal. The compensated signal is transmitted to one of the base station and user device.

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Rumson, NJ, United States of America

William Harvey Johnson