Interference mitigation in SSB and TRS processing
Interference mitigation in SSB and/or TRS processing is described. An apparatus is configured to receive, from a network node, a reference signal associated with the network node and at least one neighboring network node. The apparatus is configured to obtain Rnn information from at least one noise tap of a CIR of the reference signal. The apparatus is also configured to apply a noise whitening to the CIR based on the Rnn information.
1 . An apparatus for wireless communication at a user equipment (UE), comprising:
at least one memory; and
at least one processor coupled to the at least one memory and, based at least in part on information stored in the at least one memory, the at least one processor, individually or in any combination, is configured to:
receive, from a network node, a reference signal associated with the network node and at least one neighboring network node;
obtain cross-correlation matrix (Rnn) information from at least one noise tap of a channel impulse response (CIR) of the reference signal; and
apply a noise whitening to the CIR based on the Rnn information.
2 . The apparatus of claim 1 , wherein to obtain the Rnn information from the at least one noise tap, the at least one processor, individually or in any combination, is configured to obtain whitening matrix of noise (Wnn) information based on the Rnn information.
3 . The apparatus of claim 2 , wherein to apply the noise whitening to the CIR based on the Rnn information, the at least one processor, individually or in any combination, is configured to apply the noise whitening to the CIR based on the Wnn information.
4 . The apparatus of claim 2 , wherein to obtain the Wnn information based on the Rnn information, the at least one processor, individually or in any combination, is configured to obtain the Wnn information based on a Cholesky inverse of the Rnn information.
5 . The apparatus of claim 1 , wherein the CIR is associated with at least one of frequency or time tracking loops, a Doppler characteristic, or a delay-spread characteristic.
6 . The apparatus of claim 1 , wherein the reference signal is at least one of a tracking reference signal (TRS) or a synchronized signal block (SSB).
7 . The apparatus of claim 1 , wherein the Rnn information from the at least one noise tap of the CIR includes a set of Rnn information associated with at least two receivers of the UE.
8 . The apparatus of claim 1 , wherein the application of the noise whitening to the CIR based on the Rnn information is associated with an interference reduction of the at least one neighboring network node for a data channel, wherein the at least one processor, individually or in any combination, is further configured to:
communicate, with the network node, over the data channel based on at least one measurement of the data channel after the application of the noise whitening to the CIR based on the Rnn information.
9 . The apparatus of claim 1 , wherein the at least one processor, individually or in any combination, is further configured to:
output an indication of the application of the noise whitening to the CIR.
10 . The apparatus of claim 9 , wherein to output the indication of the application of the noise whitening to the CIR, the at least one processor, individually or in any combination, is configured to:
transmit the indication of the application of the noise whitening to the CIR; or
store the indication of the application of the noise whitening to the CIR.
11 . The apparatus of claim 1 , further comprising at least one transceiver coupled to the at least one processor;
wherein to receive, from the network node, the reference signal associated with the network node and the at least one neighboring network node, the at least one processor, individually or in any combination, is configured to receive, from the network node and via the at least one transceiver, the reference signal associated with the network node and the at least one neighboring network node.
12 . A method of wireless communication at a user equipment (UE), comprising:
receiving, from a network node, a reference signal associated with the network node and at least one neighboring network node;
obtaining cross-correlation matrix (Rnn) information from at least one noise tap of a channel impulse response (CIR) of the reference signal; and
applying a noise whitening to the CIR based on the Rnn information.
13 . The method of claim 12 , wherein obtaining the Rnn information from the at least one noise tap includes obtaining whitening matrix of noise (Wnn) information based on the Rnn information.
14 . The method of claim 13 , wherein applying the noise whitening to the CIR based on the Rnn information includes applying the noise whitening to the CIR based on the Wnn information.
15 . The method of claim 13 , wherein obtaining the Wnn information based on the Rnn information comprises obtaining the Wnn information based on a Cholesky inverse of the Rnn information.
16 . The method of claim 12 , wherein the CIR is associated with at least one of a frequency or time tracking loops, a Doppler characteristic, or a delay-spread characteristic; or
wherein the reference signal is at least one of a tracking reference signal (TRS) or a synchronized signal block (SSB).
17 . The method of claim 12 , wherein the Rnn information from the at least one noise tap of the CIR includes a set of Rnn information associated with at least two receivers of the UE.
18 . The method of claim 12 , wherein the application of the noise whitening to the CIR based on the Rnn information is associated with an interference reduction of the at least one neighboring network node for a data channel, the method further comprising:
communicating, with the network node, over the data channel based on at least one measurement of the data channel after the application of the noise whitening to the CIR based on the Rnn information.
19 . The method of claim 12 , further comprising:
outputting an indication of the application of the noise whitening to the CIR.
20 . A non-transitory computer-readable medium storing computer executable code at a user equipment (UE), the code when executed by at least one processor causes the at least one processor to:
receive, from a network node, a reference signal associated with the network node and at least one neighboring network node;
obtain cross-correlation matrix (Rnn) information from at least one noise tap of a channel impulse response (CIR) of the reference signal; and
apply a noise whitening to the CIR based on the Rnn information.