Amazon Technologies, Inc.

Empire Technology Development LLC

Danijela Cabric

Pengfei Xia

Timothy Leo Gallagher

Technologies directed to co-channel interference detection using a signal correlation test are described. One method includes receiving a radio frequency (RF) signal and generating digital sample corresponding to the RF signal. The method further includes determining a first correlation coefficient using the digital samples, a first value, and a second value. The first value corresponds to a signal lag parameter and the second value corresponds to a cyclic frequency parameter. The method further includes determining a second correlation coefficient using the digital samples, the first value, and a third value corresponding to the cyclic frequency parameter. The second value and the third value are multiples of a fourth value. The method further includes determining, using the first correlation coefficient and the second correlation coefficient, that first RF signal comprises a first portion from a second communication device and a second portion from a third communication device.

Detecting co-channel interference using cyclic autocorrelation test

Systems and methods for opportunistic radio frequency communications are provided which include the use of multiple antennas. Signal data from the antennas can be used to determine directions of incoming signals. Signal power in the direction of strongest signals can then be reduced by adjusting relative gains and phases of received signals. Reducing signal power of strong signals reduces the dynamic range of received signals and facilitates discovery of unused communication frequencies. Any unused frequencies can then be used or allocated as desired.

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Los Angeles, CA, United States of America

Danijela Cabric