Method and device for removing phase noise in wireless communication system
The present disclosure relates to a pre-5 th -Generation (5G) or 5G communication system to be provided for supporting higher data rates Beyond 4 th -Generation (4G) communication system such as Long Term Evolution (LTE). According to various embodiments of the present disclosure, an operating method of a base station includes determining at least one sub-carrier for allocating a phase tracking reference signal (PTRS), transmitting information relating to the PTRS allocation to a terminal, and based on the information, transmitting the PTRS to the terminal through the at least one sub-carrier. An apparatus and a method according to various embodiments of the present disclosure, may determine a sub-carrier for PTRS allocation and provide information relating to the PTRS allocation to a terminal, thus controlling PTRS interference caused from neighboring base stations and improving PTRS tracking performance.
1. A method performed by a base station in a wireless communication system, the method comprising:
determining a demodulation reference signal (DMRS) configuration for a DMRS group;
associating a port of phase tracking reference signal (PTRS) with a DMRS port of a lowest number among DMRS ports of the DMRS group;
determining a number F of frequency index candidates included in each of a plurality of frequency index candidate groups based on the associated DMRS port and the DMRS configuration, wherein each of the plurality of frequency index candidate groups has an identical number of frequency index candidates;
performing a modulo operation of a cell identifier of the base station and the number F;
determining one of the plurality of frequency index candidate groups based on the DMRS port associated with the port of the PTRS;
receiving from another base station, indication information indicating a sub-carrier allocated the PTRS by the other base station;
determining at least one sub-carrier for allocating a PTRS from the determined frequency index candidate group based on a result of the modulo operation and the indication information;
transmitting information relating to the PTRS allocation to a terminal; and
transmitting the PTRS to the terminal through the at least one sub-carrier based on the information;
wherein the frequency index candidate group indicates a set of sub-carriers allocated the DMRS port with a PTRS port.
2. The method of claim 1 , further comprising:
allocating the PTRS to the at least one sub-carrier.
3. The method of claim 1 , wherein the information relating to the PTRS allocation comprises at least one of information indicating the at least one sub-carrier, information relating to the DMRS configuration, and information of a DMRS port associated with a PTRS port of the PTRS.
4. The method of claim 1 , wherein a resource block (RB) allocated the PTRS is determined based on the number of RBs scheduled for the terminal, the number of available RBs for allocating the PTRS among the RBs scheduled for the terminal, and a cell ID of the base station.
5. The method of claim 1 , wherein the frequency index candidates indicate frequency indexes included in a frequency index candidate group.
6. A method performed by a terminal in a wireless communication system, the method comprising:
receiving information relating to phase tracking reference signal (PTRS) allocation from a base station;
determining at least one sub-carrier allocated the PTRS, based on the information; and
receiving the PTRS, through the at least one sub-carrier,
wherein the PTRS allocation is determined based on a modulo operation of a cell identifier of the base station and a number F of frequency index candidates included in each of a plurality of frequency index candidate groups, wherein each of the plurality of frequency index candidate groups has an identical number of frequency index candidates, and indication information indicating a sub-carrier allocated the PTRS by another base station,
wherein the frequency index candidates are determined based on a demodulation reference signal (DMRS) configuration and a DMRS port associated with a port of the PTRS,
wherein the DMRS port is a DMRS port of a lowest number among DMRS ports of a DMRS group associated with the DMRS configuration, and
wherein the frequency index candidate group indicates a set of sub-carriers allocated the DMRS port with a PTRS port.
7. The method of claim 6 ,
wherein the information relating to the PTRS allocation comprises information relating to the DMRS configuration.
8. The method of claim 6 , further comprising:
performing at least one of phase noise compensation and phase noise tracking on a data signal received from the base station based on the received PTRS.
9. The method of claim 6 , wherein the information relating to the PTRS allocation comprises at least one of information indicating the at least one sub-carrier, information relating to the DMRS configuration, and information of a DMRS port associated with a PTRS port of the PTRS.
10. The method of claim 6 , wherein a resource block (RB) allocated the PTRS is determined based on the number of RBs scheduled for the terminal, the number of available RBs for allocating the PTRS among the RBs scheduled for the terminal, and a cell ID of the base station.
11. An apparatus of a base station in a wireless communication system, the apparatus comprising:
a transceiver; and
at least one processor operably coupled to the transceiver, and configured to:
determine a demodulation reference signal (DMRS) configuration for a DMRS group,
associate a port of phase tracking reference signal (PTRS) with a DMRS port of a lowest number among DMRS ports of the DMRS group,
determine a number F of frequency index candidates included in each of a plurality of frequency index candidate groups based on the associated DMRS port and the DMRS configuration, wherein each of the plurality of frequency index candidate groups has an identical number of frequency index candidates,
perform a modulo operation of a cell identifier of the base station and the number F,
determine one of the plurality of frequency index candidate groups based on the DMRS port associated with the port of the PTRS,
receive from another base station, indication information indicating a sub-carrier allocated the PTRS by the other base station,
determine at least one sub-carrier for a PTRS allocation from the determined frequency index candidate group based on a result of the modulo operation and the indication information,
transmit information relating to the PTRS allocation to a terminal, and
transmit the PTRS to the terminal through the at least one sub-carrier, based on the information,
wherein the frequency index candidate group indicates a set of sub-carriers allocated the DMRS port with a PTRS port.
12. The apparatus of claim 11 , wherein the at least one processor is further configured to:
allocate the PTRS to the at least one sub-carrier.
13. The apparatus of claim 11 , wherein the information relating to the PTRS allocation comprises at least one of information indicating the at least one sub-carrier, information relating to the DMRS configuration, and information of a DMRS port associated with a PTRS port of the PTRS.
14. The apparatus of claim 11 , wherein a resource block (RB) allocated the PTRS is determined based on the number of RBs scheduled for the terminal, the number of available RBs for allocating the PTRS among the RBs scheduled for the terminal, and a cell ID of the base station.