Wireless communication device for performing interference whitening operation and operating method thereof
An operating method of a wireless communication device performing an interference whitening operation includes obtaining first channel state information of the wireless communication device, selecting a selected mode from among a plurality of modes related to the interference whitening operation, the selected mode corresponding to the first channel state information, obtaining channel performance information according to the selected mode, and updating a value function expected value based on the first channel state information, the selected mode, and the channel performance information.
1. An operating method of a wireless communication device performing an interference whitening operation, the operating method comprising:
obtaining first channel state information of the wireless communication device;
selecting a selected mode from among a plurality of modes related to the interference whitening operation, the selected mode corresponding to the first channel state information, and each of the plurality of modes corresponding to a respective value function expected value among a plurality of value function expected values;
obtaining channel performance information according to the selected mode; and
updating a first value function expected value based on the first channel state information, the selected mode, and the channel performance information, the first value function expected value being among the plurality of value function expected values, and the first value function expected value corresponding to the selected mode.
2. The operating method of claim 1 , wherein the plurality of modes comprise an interference whitening activation mode and an interference whitening deactivation mode.
3. The operating method of claim 2 , wherein the interference whitening activation mode is one of a plurality of interference whitening activation modes, each of the plurality of interference whitening activation modes corresponding to a different number of resource blocks assigned to interference whitening.
4. The operating method of claim 1 , wherein the selecting the selected mode is based on policy information with respect to the first channel state information.
5. The operating method of claim 1 , wherein the selecting the selected mode comprises:
randomly selecting the selected mode according to a certain probability; and
selecting the selected mode based on policy information with respect to the first channel state information according to an inverse of the certain probability.
6. The operating method of claim 5 , further comprising:
changing the policy information based on a second value function expected value obtained being greater than a third value function expected value, the second value function expected value being based on a corresponding selected mode obtained by random selection, and the third value function expected value being based on a corresponding selected mode obtained based on the policy information.
7. The operating method of claim 1 , wherein
the updating the first value function expected value comprises generating an immediate reward value corresponding to the channel performance information, the channel performance information corresponding to second channel state information obtained according to the selected mode; and
updating the first value function expected value based on the immediate reward value and a future reward value obtained based on the second channel state information.
8. The operating method of claim 7 , wherein the updating the first value function expected value based on the immediate reward value and the future reward value comprises determining the future reward value based on the second channel state information and the plurality of value function expected values.
9. The operating method of claim 8 , wherein the updating the first value function expected value comprises generating an updated first value function expected value by weighted-averaging an update expected value and a previous expected value based on a learning rate, the update expected value being generated based on the immediate reward value and the future reward value.
10. The operating method of claim 9 , wherein the generating the updated first value function expected value comprises generating the update expected value by summing the immediate reward value with a value obtained by multiplying the future reward value by a discount rate.
11. The operating method of claim 1 , wherein
the first channel state information comprises a signal to interference plus noise ratio (SINR); and
the channel performance information comprises an absolute value of a difference between a channel capacity and a threshold value.
12. An operating method of a wireless communication device performing an interference whitening operation, the operating method comprising:
obtaining first channel state information of the wireless communication device;
selecting a selected mode from among a plurality of modes related to the interference whitening operation, the selected mode corresponding to the first channel state information;
obtaining channel performance information according to the selected mode; and
updating a value function expected value based on the first channel state information, the selected mode, and the channel performance information,
wherein the operating method further comprises initializing policy information with respect to the value function expected value in response to initializing a communication processor of the wireless communication device.
13. A wireless communication device comprising: processing circuitry configured to,
obtain first channel state information,
select a selected mode from among a plurality of modes related to an interference whitening operation, the selected mode corresponding to the first channel state information, and each of the plurality of modes corresponding to a respective value function expected value among a plurality of value function expected values,
obtain channel performance information corresponding to the selected mode, and
update a first value function expected value based on the first channel state information, the selected mode, and the channel performance information, the first value function expected value being among the plurality of value function expected values, and the first value function expected value corresponding to the selected mode.
14. The wireless communication device of claim 13 , wherein the plurality of modes comprise an interference whitening activation mode and an interference whitening deactivation mode.
15. The wireless communication device of claim 13 , further comprising:
a memory storing policy information designating first channel state information in association with the plurality of modes,
wherein the processing circuitry is configured to select the selected mode based on the policy information with respect to the first channel state information.
16. The wireless communication device of claim 13 , wherein the processing circuitry is configured to:
generate an immediate reward value corresponding to the channel performance information, the channel performance information corresponding to second channel state information obtained according to the selected mode; and
update the first value function expected value based on the immediate reward value and a future reward value obtained based on the second channel state information.
17. The wireless communication device of claim 16 , wherein the processing circuitry is configured to determine the future reward value based on the second channel state information and a plurality of value function expected values corresponding to the plurality of modes.
18. The wireless communication device of claim 13 , wherein the first channel state information comprises a signal to interference plus noise ratio (SINR); and
wherein the channel performance information comprises an absolute value of a difference between a channel capacity and a threshold value.