Abstract: A system and method for mitigating self-interference in mmWave systems. A transceiver can include a mutual precoder controller that controls both an analog/RF beamforming circuit and a digital/BB beamforming circuit to prefer beams directed along paths in the local RF environment that minimize self-interference. In other cases, a transceiver can include one or more self-interference filters to internally mitigate self-interference.

Abstract: A mesh network node can include a self-interference cancellation subsystem. Operation of the self-interference cancellation subsystem enables persistent and/or continuous spectrum monitoring by the mesh network node. The mesh network node can transmit spectrum information at one or more intervals to a spectrum access server which can leverage spectrum information provided by multiple mesh nodes to optimize connections and/or links between nodes in the mesh network.

Abstract: A wireless communications relay includes a first radio and a second radio operating over adjacent channels. A baseband signal to be transmitted (the “transmit signal”) from the first radio is split along two paths. A first path is delayed by a delay element and the second path is provided as input to a channel model configured to implement a transfer function approximating an echo channel of the local RF environment. The channel model outputs a baseband approximation of echo channel effects of the transmit signal, after which an RF chain modulates the echo channel approximation to the RF domain. This RF echo channel approximation is thereafter filtered by an RF band pass filter turned to an operating channel of the second radio. The filtered signal is thereafter combined with received signal to compensate for self-interference.