Adjacent channel interference mitigation for ultra-wideband systems

1 . An apparatus for wireless communication at a wireless communication device, comprising:

at least one processor;

at least one memory coupled with the at least one processor; and

instructions stored in the at least one memory and executable by the at least one processor to cause the apparatus to:

receive control information that identifies a preamble for communications to the wireless communication device in an ultra-wideband system;

receive, via a signal in the ultra-wideband system, a data packet that includes the preamble;

determine an interference metric that is based at least in part on an estimated channel impulse response of the signal; and

process the data packet based at least in part on the interference metric.

2 . The apparatus of claim 1 , wherein the instructions to determine the interference metric are executable by the at least one processor to cause the apparatus to:

estimate the channel impulse response of the signal across the preamble of the data packet, wherein the interference metric is based at least in part on the channel impulse response.

3 . The apparatus of claim 2 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

determine a signal to interference plus noise ratio across the preamble of the data packet, wherein processing the data packet is based at least in part on the interference metric and the signal to interference plus noise ratio.

4 . The apparatus of claim 3 , wherein the instructions to process the data packet are executable by the at least one processor to cause the apparatus to:

demodulate a post-preamble portion of the data packet based at least in part on a value of the interference metric not satisfying an interference threshold, a value of the signal to interference plus noise ratio satisfying a signal to interference plus noise ratio threshold, or both.

5 . The apparatus of claim 3 , wherein the instructions to process the data packet are executable by the at least one processor to cause the apparatus to:

refrain to demodulate a post-preamble portion of the data packet based at least in part on a value of the interference metric satisfying an interference threshold, a value of the signal to interference plus noise ratio not satisfying a signal to interference plus noise ratio threshold, or both.

6 . The apparatus of claim 5 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

monitor for one or more additional data packets that include the preamble based at least in part on refraining to demodulate the post-preamble portion of the data packet.

7 . The apparatus of claim 3 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

process one or more post-preamble portions of the data packet; and

output an indication of the estimated channel impulse response, or a value of the signal to interference plus noise ratio, or both, for use by an application of the wireless communication device in a determination of whether to drop the data packet.

8 . The apparatus of claim 2 , wherein the preamble of the data packet comprises one or more symbols of a synchronization field.

9 . The apparatus of claim 2 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

determine that a value of the interference metric satisfies an interference threshold; and

determine a first value of a signal to interference plus noise ratio across a portion of the preamble of the data packet based at least in part on the value of the interference metric satisfying the interference threshold, wherein processing the data packet is based at least in part on the first value of the signal to interference plus noise ratio.

10 . The apparatus of claim 9 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

determine that the first value of the signal to interference plus noise ratio fails to satisfy a signal to interference plus noise ratio threshold; and

refrain to demodulate a post-preamble portion of the data packet based at least in part on the first value of the signal to interference plus noise ratio not satisfying the signal to interference plus noise ratio threshold.

11 . The apparatus of claim 9 , wherein the instructions are further executable by the at least one processor to cause the apparatus to:

determine that the first value of the signal to interference plus noise ratio satisfies a signal to interference plus noise ratio threshold;

initiate a timer in response to the value of the interference metric satisfying the interference threshold; and

refrain to demodulate a post-preamble portion of the data packet based at least in part on the first value of the signal to interference plus noise ratio satisfying the signal to interference plus noise ratio threshold and a duration of the timer satisfying a time threshold.

12 . The apparatus of claim 9 , wherein the portion of the preamble of the data packet comprises one or more symbols of the preamble.

13 . The apparatus of claim 1 , wherein the instructions to determine the interference metric are executable by the at least one processor to cause the apparatus to:

sample the estimated channel impulse response to obtain a plurality of taps, wherein each tap of the plurality of taps corresponds to a magnitude of the estimated channel impulse response at a respective time instance;

select a first tap from the plurality of taps, wherein a value of the first tap is greater than a respective value of each remaining taps of the plurality of taps;

select a second tap from among the second tap and a third tap of the plurality of taps, wherein the second tap and the third tap are adjacent to the first tap in time, and wherein a value of the second tap is greater than a value of the third tap; and

determine the interference metric based at least in part on the first tap and the second tap.

14 . The apparatus of claim 13 , wherein the interference metric is based at least in part on a phase difference between the first tap and the second tap.

15 . The apparatus of claim 13 , wherein a duration between the first tap and the second tap comprises half of a chip duration.

16 . The apparatus of claim 1 , wherein the apparatus comprises a plurality of antennas, and wherein the instructions to determine the interference metric are executable by the at least one processor to cause the apparatus to:

determine a combined interference metric that is based at least in part on a plurality of estimated channel impulse responses of the signal across the plurality of antennas, each estimated channel impulse response corresponds to a respective antenna of the plurality of antennas.

17 . A method for wireless communication at a wireless communication device, comprising:

receiving control information that identifies a preamble for communications to the wireless communication device in an ultra-wideband system;

receiving, via a signal in the ultra-wideband system, a data packet that includes the preamble;

determining an interference metric that is based at least in part on an estimated channel impulse response of the signal; and

processing the data packet based at least in part on the interference metric.

18 . The method of claim 17 , wherein determining the interference metric comprises:

estimating the channel impulse response of the signal across the preamble of the data packet, wherein the interference metric is based at least in part on the channel impulse response.

19 . The method of claim 18 , further comprising:

determining a signal to interference plus noise ratio across the preamble of the data packet, wherein processing the data packet is based at least in part on the interference metric and the signal to interference plus noise ratio.

20 . The method of claim 19 , wherein processing the data packet comprises:

demodulating a post-preamble portion of the data packet based at least in part on a value of the interference metric not satisfying an interference threshold, a value of the signal to interference plus noise ratio satisfying a signal to interference plus noise ratio threshold, or both.

21 . The method of claim 19 , wherein processing the data packet comprises:

refraining to demodulate a post-preamble portion of the data packet based at least in part on a value of the interference metric satisfying an interference threshold, a value of the signal to interference plus noise ratio not satisfying a signal to interference plus noise ratio threshold, or both.

22 . The method of claim 21 , further comprising:

monitoring for one or more additional data packets that include the preamble based at least in part on refraining to demodulate the post-preamble portion of the data packet.

23 . The method of claim 19 , further comprising:

processing one or more post-preamble portions of the data packet; and

outputting an indication of the estimated channel impulse response, or a value of the signal to interference plus noise ratio, or both, for use by an application of the wireless communication device in a determination of whether to drop the data packet.

24 . The method of claim 18 , further comprising:

determining that a value of the interference metric satisfies an interference threshold; and

determining a first value of a signal to interference plus noise ratio across a portion of the preamble of the data packet based at least in part on the value of the interference metric satisfying the interference threshold, wherein processing the data packet is based at least in part on the first value of the signal to interference plus noise ratio.

25 . An apparatus for wireless communication at a wireless communication device, comprising:

means for receiving control information that identifies a preamble for communications to the wireless communication device in an ultra-wideband system;

means for receiving, via a signal in the ultra-wideband system, a data packet that includes the preamble;

means for determining an interference metric that is based at least in part on an estimated channel impulse response of the signal; and

means for processing the data packet based at least in part on the interference metric.

26 . The apparatus of claim 25 , wherein the means for determining the interference metric comprise:

means for estimating the channel impulse response of the signal across the preamble of the data packet, wherein the interference metric is based at least in part on the channel impulse response.

27 . The apparatus of claim 26 , further comprising:

means for determining a signal to interference plus noise ratio across the preamble of the data packet, wherein processing the data packet is based at least in part on the interference metric and the signal to interference plus noise ratio.

28 . A non-transitory computer-readable medium storing code for wireless communication at a wireless communication device, the code comprising instructions executable by a processor to:

receive control information that identifies a preamble for communications to the wireless communication device in an ultra-wideband system;

receive, via a signal in the ultra-wideband system, a data packet that includes the preamble;

determine an interference metric that is based at least in part on an estimated channel impulse response of the signal; and

process the data packet based at least in part on the interference metric.

29 . The non-transitory computer-readable medium of claim 28 , wherein the instructions to determine the interference metric are executable by the processor to:

sample the estimated channel impulse response to obtain a plurality of taps, wherein each tap of the plurality of taps corresponds to a magnitude of the estimated channel impulse response at a respective time instance;

select a first tap from the plurality of taps, wherein a value of the first tap is greater than a respective value of each remaining taps of the plurality of taps;

select a second tap from among the second tap and a third tap of the plurality of taps, wherein the second tap and the third tap are adjacent to the first tap in time, and wherein a value of the second tap is greater than a value of the third tap; and

determine the interference metric based at least in part on the first tap and the second tap.

30 . The non-transitory computer-readable medium of claim 29 , wherein the interference metric is based at least in part on a phase difference between the first tap and the second tap.