Wireless devices and systems including examples of full duplex transmission
Examples described herein include systems and methods which include wireless devices and systems with examples of full duplex compensation with a self-interference noise calculator. The self-interference noise calculator may be coupled to antennas of a wireless device and configured to generate adjusted signals that compensate self-interference. The self-interference noise calculator may include a network of processing elements configured to combine transmission signals into sets of intermediate results. Each set of intermediate results may be summed in the self-interference noise calculator to generate a corresponding adjusted signal. The adjusted signal is received by a corresponding wireless receiver to compensate for the self-interference noise generated by a wireless transmitter transmitting on the same frequency band as the wireless receiver is receiving.
1. A method of full duplex transmission with self-interference compensation comprising:
transmitting a plurality of transmit signals to be transmitted at a first plurality of antennas;
simultaneously, receiving a plurality of receive signals received at respective antennas of a second plurality of antennas;
calculating, at a network of processing elements coupled to a plurality of wireless transmit paths, first processing results based on the plurality of transmit signals as input data, wherein the network of processing elements is trained using sample vectors to determine a center vector and connection weights for a layer of processing elements, wherein the first processing results are calculated using multiplication units included in the layer of processing elements, the multiplication units comprising a non-linear vector set based on a non-linear function, and wherein the multiplication units apply weights to the first processing results based on the connection weights and an expected amount of interference;
calculating, at the network of processing elements, output data based on the first processing results, wherein the output data is calculated using accumulation units included in the network of processing elements, and wherein the accumulation units sum the first processing results;
providing, from the network of processing elements, the output data as a plurality of adjustment signals to a plurality of wireless receive paths; and
adjusting the plurality of receive signals received at the respective antennas of the second plurality of antennas with a corresponding adjustment signal of the plurality of adjustment signals.
2. The method of claim 1 , wherein the plurality of transmit signals to be transmitted at the first plurality of antennas comprise transmit signals at a Radio Frequency (RF) band of 6 GHz or more, a millimeter wave band, an unlicensed frequency band, or combinations thereof.
3. The method of claim 1 , wherein the plurality of transmit signals to be transmitted at the first plurality of antennas comprise transmit signals according to a 5G protocol.
4. The method of claim 1 , wherein calculating the output data comprises summing the first processing results based on respective weights to generate the plurality of adjustment signals.
5. The method of claim 4 , wherein the respective weights comprise weight vectors applied to the first processing results based on an amount of interference expected for a respective transmit signal of the plurality of transmit signals.
6. The method of claim 1 , wherein the network of processing elements further comprises bit manipulation units.
7. The method of claim 1 , wherein the network of processing elements comprises a self-interference noise calculator.
8. The method of claim 1 , wherein the plurality of adjustment signals are generated based on a respective self-interference statistic of a plurality of self-interference statistics.
9. The method of claim 1 , wherein adjusting the plurality of receive signals includes subtracting the corresponding adjustment signal from a respective radio frequency (RF) signal to generate a respective compensated signal.
10. An apparatus for full duplex transmission with self-interference compensation comprising:
a first wireless transceiver coupled to a first antenna;
a second wireless transceiver coupled to a second antenna; and
a self-interference noise calculator comprising a network of processing elements trained using sample vectors to determine a center vector and connection weights for a layer of processing elements, wherein the self-interference noise calculator is configured to:
receive first signals to be transmitted via the first antenna; and
generate adjusted signals based on the first signals and using the network of processing elements, wherein the adjusted signals are configured to compensate for self-interference in second signals received via the second antenna, wherein the first signals and the second signals are in a same frequency band, wherein the network of processing elements includes multiplication units comprising a non-linear vector set based on a non-linear function, the multiplication units configured to generate processing results using the first signals, and wherein the multiplication units apply weights to the processing results based on the connection weights and an expected amount of interference.
11. The apparatus of claim 10 , wherein the center vector is determined, at least in part, by performing a cluster analysis to determine the center vector from among a set of vectors.
12. The apparatus of claim 10 , wherein the self-interference noise calculator is further configured to:
calculate first processing results based on the received first signals;
calculate output data based on the first processing results;
provide the adjusted signals based on the output data; and
adjust the second signals according to corresponding adjusted signals of the adjusted signals.
13. The apparatus of claim 12 , wherein calculating the output data comprises summing the first processing results based on respective weights to generate the adjusted signals.
14. The apparatus of claim 13 , wherein the respective weights comprise weight vectors applied to the first processing results based on an amount of interference expected for a respective first signal of the first signals.
15. The apparatus of claim 12 , wherein adjusting the second signals includes subtracting the corresponding adjusted signals from a respective radio frequency (RF) signal to generate a respective compensated signal.
16. The apparatus of claim 10 , wherein the received first signals comprise transmit signals at a radio frequency (RF) band of 6 GHz or more, a millimeter wave band, an unlicensed frequency band, or combinations thereof.
17. The apparatus of claim 10 , wherein the received first signals comprise transmit signals according to a 5G protocol.
18. The apparatus of claim 10 , wherein the adjusted signals are generated based on a respective self-interference statistic of a plurality of self-interference statistics.
19. The method of claim 1 , wherein the network of processing elements is trained based on an error function for the plurality of adjustment signals, and wherein the error function uses a gradient descent procedure.
20. The method of claim 19 , wherein the center vector is determined using a cluster analysis to determine the center vector from among a set of the sample vectors based on training points, and wherein the error function is based on a distance away from the training points.
21. The method of claim 1 wherein the connection weights are determined using linear least-squares optimization.
22. The method of claim 1 , wherein the connection weights are determined using batch processing, and wherein sample sets of the connection weights are retrieved from a memory.