Detection of near-field location for wireless communications

A method for wireless communications at a first wireless device, comprising:

• receiving, at a first antenna array, a plurality of reference signals from a second antenna array of a second wireless device;
• measuring a plurality of phases of the plurality of reference signals, wherein the plurality of phases correspond to respective antenna pairs that each comprise a respective first antenna of the first antenna array and a respective second antenna of the second antenna array;
• determining, based at least in part on the plurality of phases, a plurality of angle parameters comprising a plurality of first order angle parameters and a plurality of second order angle parameters, wherein the plurality of first order angle parameters comprises linear terms associated with a distance between a first antenna of the first antenna array and a center of the first antenna array or a distance between a second antenna of the second antenna array and a center of the second antenna array, and wherein the plurality of second order angle parameters comprises quadratic terms associated with the distance between the first antenna of the first antenna array and the center of the first antenna array or the distance between the second antenna of the second antenna array and the center of the second antenna array;
• determining that at least one second order angle parameter of the plurality of second order angle parameters satisfies an angle parameter threshold;
• and
• communicating with the second wireless device based at least in part on the determination that at least one second order angle parameter of the plurality of second order angle parameters satisfies the angle parameter threshold.

An apparatus for wireless communications at a first wireless device, comprising:

• means for receiving, at a first antenna array, a plurality of reference signals from a second antenna array of a second wireless device;
• means for measuring a plurality of phases of the plurality of reference signals, wherein the plurality of phases correspond to respective antenna pairs that each comprise a respective first antenna of the first antenna array and a respective second antenna of the second antenna array;
• means for determining, based at least in part on the plurality of phases, a plurality of angle parameters comprising a plurality of first order angle parameters and a plurality of second order angle parameters, wherein the plurality of first order angle parameters comprises linear terms associated with a distance between a first antenna of the first antenna array and a center of the first antenna array or a distance between a second antenna of the second antenna array and a center of the second antenna array, and wherein the plurality of second order angle parameters comprises quadratic terms associated with the distance between the first antenna of the first antenna array and the center of the first antenna array or the distance between the second antenna of the second antenna array and the center of the second antenna array;
• means for determining that at least one second order angle parameter of the plurality of second order angle parameters satisfies an angle parameter threshold;
• and
• means for communicating with the second wireless device based at least in part on the determination that at least one second order angle parameter of the plurality of second order angle parameters satisfies the angle parameter threshold.

A non-transitory computer-readable medium storing code for wireless communications at a first wireless device, the code comprising instructions executable by a processor to cause the first wireless device to:

• receive, at a first antenna array, a plurality of reference signals from a second antenna array of a second wireless device;
• measure a plurality of phases of the plurality of reference signals, wherein the plurality of phases correspond to respective antenna pairs that each comprise a respective first antenna of the first antenna array and a respective second antenna of the second antenna array;
• determine, based at least in part on the plurality of phases, a plurality of angle parameters comprising a plurality of first order angle parameters and a plurality of second order angle parameters, wherein the plurality of first order angle parameters comprises linear terms associated with a distance between a first antenna of the first antenna array and a center of the first antenna array or a distance between a second antenna of the second antenna array and a center of the second antenna array, and wherein the plurality of second order angle parameters comprises quadratic terms associated with the distance between the first antenna of the first antenna array and the center of the first antenna array or the distance between the second antenna of the second antenna array and the center of the second antenna array;
• determine that at least one second order angle parameter of the plurality of second order angle parameters satisfies an angle parameter threshold;
• and
• communicate with the second wireless device based at least in part on the determination that at least one second order angle parameter of the plurality of second order angle parameters satisfies the angle parameter threshold.