Multiple interferer cancellation for communications systems

摘要

An interference cancellation system (ICS) may be used with a communication system to prevent or minimize interference from one or more sources. The ICS may receive radio RF signals comprised of one or more signals of interest (SOI) and multiple interfering signals. The ICS may use a sample of the interfering signals to cancel the interfering signals from the SOI. The multiple interfering signals may be converted into a single optical signal for cancellation. One or more optical cancellation paths may be used for interference cancellation. Each optical cancellation path may include an optical attenuator and/or an optical delay to achieve phase shifts and/or delays for interference cancellation.

主权项

1. An interference cancellation system (ICS) comprising:
radio frequency (RF) circuitry configured to receive a plurality of RF interference signals and a combined signal, the plurality of RF interference signals comprising a first RF interference signal and a second RF interference signal, and the combined signal comprising a combination of a signal of interest (SOI) and at least the plurality of RF interference signals; optical circuitry configured to:
convert the first RF interference signal to a first optical interference signal and apply a 180 phase shift to the first optical interference signal,convert the second RF interference signal to a second optical interference signal and apply a 180 phase shift to the second optical interference signal,convert the combined signal to an optical combined signal, wherein the optical circuitry comprises a first optical cancellation path and a second optical cancellation path, each of the first and second optical cancellation paths comprise an optical attenuator and an optical time delay, the first optical cancellation path is configured to attenuate and apply a time delay the first optical interference signal, and the second optical cancellation path is configured to attenuate and apply time delay the second optical interference signal, andcombine the first optical interference signal after processing by the first optical cancellation path and the second optical interference signal after processing by the second optical cancellation path with the optical combined signal to generate an optical output signal, andconvert the optical output signal to an RF output signal, the RF output signal comprising the SOI with the first and second RF interference signals substantially removed; and a processor configured to control the attenuation and time delays applied via the first and second optical cancellation paths of the optical circuitry.