| CPC H04B 17/102 (2015.01) [H04B 17/309 (2015.01)] | 20 Claims |

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1. A method performed by a first node in a wireless communication system, the method comprising:
performing channel estimation on an echo signal of a first signal transmitted by the first node;
determining a first filter based on a result of the channel estimation and a distance between the first node and a target; and
performing a first filtering process on the result of channel estimation based on the first filter.
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