Self-interference mitigation in in-band full-duplex communication systems
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.
1. A wireless transceiver for an in-band full duplex radio frequency (“RF”) communication system, the wireless transceiver comprising:
a transmit side comprising:
a digital input receiving a first data stream as input;
a first precoder receiving the data stream as input;
a digital to analog converter receiving output of the first precoder as input;
a first RF chain receiving output of the digital to analog converter as input;
a second precoder receiving output of the RF chain as input; and
a first antenna array receiving output of the second precoder as input and configured to emit RF energy in a selected band into a local RF environment;
a receive side comprising:
a second antenna array receiving RF energy in the selected band from the local RF environment;
a first combiner receiving the received RF energy as input;
a second RF chain receiving output of the first combiner as input;
an analog to digital converter receiving output of the second RF chain as input;
a second combiner receiving output of the analog to digital converter as input; and
a digital output receiving output of the second combiner as input and configured to provide a second data stream as output; and
a controller configured to instantiate an instance of a trained predictive model configured to provide, as output, configuration parameters for each of the first precoder and the second precoder, the controller configured to apply the configuration parameters to both the first precoder and the second precoder based on channel state information, the configuration parameters configured to minimize the RF energy emitted by the first antenna array that returns to the second antenna array.
2. The wireless transceiver of claim 1 , comprising a self-interference cancellation filter coupling output of the second precoder to input of the first combiner.
3. The wireless transceiver of claim 2 , wherein:
the self-interference cancellation filter is a first self-interference cancellation filter; and
the wireless transceiver comprises a second self-interference cancellation filter coupling output of the first precoder to input of the second combiner.
4. The wireless transceiver of claim 3 , wherein the first self-interference cancellation filter cancels a first portion of self-interference and the second self-interference cancellation filter cancels a second portion of self-interference.
5. The wireless transceiver of claim 4 , wherein the first self-interference cancellation filter introduces a phase shift to output of the second precoder.
6. The wireless transceiver of claim 4 , wherein:
the configuration parameters are first configuration parameters and;
the controller is configured to apply second configuration parameters to the first self-interference cancellation filter and the second self-interference cancellation filter, the second configuration parameters configured to minimize the RF energy emitted by the first antenna array that returns to the second antenna array and is received at the first combiner.
7. The wireless transceiver of claim 6 , wherein:
the instance of the trained predictive model is configured to provide the second configuration parameters as output.
8. The wireless transceiver of claim 7 , wherein the instance of the trained predictive model comprises a neural network configured to receive as input at least one of the first data stream or the second data stream.
9. The wireless transceiver of claim 1 , wherein the controller is configured to access a codebook to provide configuration parameters to the second precoder.
10. The wireless transceiver of claim 1 , wherein the RF energy is emitted into the local RF environment by the first antenna array at at least one frequency between 1 GHz and 300 GHz.
11. The wireless transceiver of claim 1 , wherein:
the configuration parameters are first configuration parameters; and
the controller is configured to provide second configuration parameters to both the first combiner and the second combiner based on the channel state information, the second configuration parameters configured to minimize the RF energy emitted by the first antenna array that returns to the second antenna array.
12. The wireless transceiver of claim 1 , wherein the second antenna array and the first antenna array are portions of a third antenna array.