Interference mitigation based on antenna system phase distribution
A method of interference mitigation may include receiving a desired signal from an asset of the system at an antenna assembly and associating the desired signal with relative phase distribution information based on a relative location of origin of the desired signal where the relative phase distribution information is predetermined for the antenna assembly. The method further includes receiving an interfering signal and associating the interfering signal with relative phase distribution information based on a relative location of origin of the interfering signal where the desired signal and the interfering signal forming a received signal set. The method further includes normalizing signals of the received signal set to respective relative phases associated with each respective relative location of origin, and performing interference cancellation of the interfering signal based on the normalized signals.
1. A method for interference mitigation in a wireless communication system, the method comprising:
determining a relative phase distribution for the antenna assembly of the wireless communication system to define relative phase distribution information for the antenna assembly;
generating a phase distribution map for the antenna assembly based on the relative phase distribution for each location on an orientation reference sphere or hemisphere; and
employing the phase distribution map to perform interference cancellation for the antenna assembly.
2. The method of claim 1 , wherein employing the phase distribution map to perform interference cancellation comprises:
receiving a desired signal from an asset of the system at the antenna assembly;
associating the desired signal with relative phase distribution information based on a relative location of origin of the desired signal using the phase distribution map;
receiving an interfering signal;
associating the interfering signal with relative phase distribution information based on a relative location of origin of the interfering signal, the desired signal and the interfering signal forming a received signal set;
normalizing signals of the received signal set to respective relative phases associated with each respective relative location of origin; and
cancelling the interfering signal based on the normalized signals.
3. The method of claim 2 , wherein performing interference cancellation comprises inverting normalized signals not from the relative location of origin of the desired signal and adding the inverted normalized signals into the received signal set for processing at a receiver associated with the antenna assembly.
4. The method of claim 3 , wherein associating the desired signal with relative phase distribution information and associating the interfering signal with relative phase distribution information are each performed based on the phase distribution map.
5. The method of claim 3 , wherein associating the desired signal with relative phase distribution information further comprises associating the desired signal with relative amplitude distribution information based on the relative location of origin of the desired signal, and
wherein associating the interfering signal with relative phase distribution information further comprises associating the interfering signal with relative amplitude distribution information based on the relative location of origin of the interfering signal.
6. The method of claim 5 , wherein the relative amplitude distribution information based on the relative location of origin of the desired signal, and the relative amplitude distribution information based on the relative location of origin of the interfering signal are each obtained from the phase distribution map.
7. The method of claim 2 , wherein cancelling the interfering signal comprises applying a cancellation signal corresponding to portions of the received signal set not from the relative location of origin of the desired signal in the radio frequency (RF) domain.
8. The method of claim 2 , wherein cancelling the interfering signal comprises applying a cancellation signal corresponding to portions of the received signal set not from the relative location of origin of the desired signal in the baseband domain.
9. The method of claim 2 , wherein associating the desired signal with relative phase distribution information comprises determining the relative location of origin of the desired signal with respect to a locational region on an orientation reference sphere, wherein the locational region has a known phase distribution pattern.
10. The method of claim 2 , wherein associating the desired signal with relative phase distribution information comprises determining the relative location of origin of the desired signal with respect to a locational region on an orientation reference hemisphere, wherein the locational region has a known phase distribution pattern.
11. An interference mitigation module comprising processing circuitry configured to:
determine a relative phase distribution for the antenna assembly of the wireless communication system to define relative phase distribution information for the antenna assembly;
generate a phase distribution map for the antenna assembly based on the relative phase distribution for each location on an orientation reference sphere or hemisphere; and
employ the phase distribution map to perform interference cancellation for the antenna assembly.
12. The module of claim 11 , wherein employing the phase distribution map to perform interference cancellation comprises the processing circuitry being configured to:
receive a desired signal from an asset of the system at the antenna assembly;
associate the desired signal with relative phase distribution information based on a relative location of origin of the desired signal using the phase distribution map;
receive an interfering signal;
associate the interfering signal with relative phase distribution information based on a relative location of origin of the interfering signal, the desired signal and the interfering signal forming a received signal set;
normalize signals of the received signal set to respective relative phases associated with each respective relative location of origin; and
cancel the interfering signal based on the normalized signals.
13. The interference mitigation module of claim 12 , wherein performing interference cancellation comprises inverting normalized signals not from the relative location of origin of the desired signal and adding the inverted normalized signals into the received signal set for processing at a receiver associated with the antenna assembly.
14. The interference mitigation module of claim 13 , wherein associating the desired signal with relative phase distribution information and associating the interfering signal with relative phase distribution information are each performed based on the phase distribution map.
15. The interference mitigation module of claim 13 , wherein associating the desired signal with relative phase distribution information further comprises associating the desired signal with relative amplitude distribution information based on the relative location of origin of the desired signal, and
wherein associating the interfering signal with relative phase distribution information further comprises associating the interfering signal with relative amplitude distribution information based on the relative location of origin of the interfering signal.
16. The interference mitigation module of claim 15 , wherein the relative amplitude distribution information based on the relative location of origin of the desired signal, and the relative amplitude distribution information based on the relative location of origin of the interfering signal are each obtained from the phase distribution map.
17. The interference mitigation module of claim 12 , wherein cancelling the interfering signal comprises applying a cancellation signal corresponding to portions of the received signal set not from the relative location of origin of the desired signal in the radio frequency (RF) domain.
18. The interference mitigation module of claim 12 , wherein cancelling the interfering signal comprises applying a cancellation signal corresponding to portions of the received signal set not from the relative location of origin of the desired signal in the baseband domain.
19. The interference mitigation module of claim 12 , wherein associating the desired signal with relative phase distribution information comprises determining the relative location of origin of the desired signal with respect to a locational region on an orientation reference sphere, wherein the locational region has a known phase distribution pattern.
20. The interference mitigation module of claim 12 , wherein associating the desired signal with relative phase distribution information comprises determining the relative location of origin of the desired signal with respect to a locational region on an orientation reference hemisphere, wherein the locational region has a known phase distribution pattern.