Apparatus and method for performing precoding in wireless communication system using massive antenna

1. A method for operating a base station in a wireless communication system, the method comprising:

transmitting vertical reference signals and horizontal reference signals that are generated based on an interference relationship between terminals;

receiving long-term channel information determined by using the vertical reference signals and the horizontal reference signals;

transmitting reference signals beamformed by a first beamformer generated based on the long-term channel information;

receiving short-term channel information determined by using the beamformed reference signals; and

transmitting a data signal beamformed by a second beamformer generated based on the short-term channel information.

2. The method of claim 1 , further comprising receiving, from another base station, long-term channel information for a serving terminal of the another base station for cooperative communication with the another base station.

3. The method of claim 1 , further comprising receiving uplink reference signals from the terminals in order to determine the interference relationship between the terminals.

4. The method of claim 1 , further comprising grouping the terminals in consideration of at least one terminal located on an edge of at least one neighboring cell.

5. The method of claim 1 , further comprising transmitting long-term channel information for an interference cell, which is received from a serving terminal, to at least one of a neighboring base station or a central station.

6. The method of claim 1 , further comprising:

receiving, from a terminal located in a neighboring cell, information for interference exerted on the terminal by a serving base station of the terminal; and

determining the first beamformer in consideration of the information for the interference.

7. The method of claim 1 , further comprising:

determining the first beamformer that is a sum-mean square error (MSE) based beamformer, based on the long-term channel information; and

determining the second beamformer that is a weighted minimum mean square error (MMSE) based beamformer, based on the short-term channel information,

wherein the vertical reference signals and the horizontal reference signals are transmitted and received through a resource different from a resource for transmitting vertical reference signals and horizontal reference signals transmitted from a neighboring base station.

8. A method for operating a terminal in a wireless communication system, the method comprising:

receiving, from a base station, vertical reference signals and horizontal reference signals that are generated based on an interference relationship between terminals;

transmitting long-term channel information determined by using the vertical reference signals and the horizontal reference signals;

receiving reference signals beamformed by a first beamformer generated based on the long-term channel information;

transmitting short-term channel information determined by using the beamformed reference signals; and

receiving a data signal beamformed by a second beamformer generated based on the short-term channel information.

9. The method of claim 8 , further comprising transmitting an uplink reference signal so that the base station determines the interference relationship between the terminals.

10. The method of claim 8 , wherein the terminals are grouped in consideration of at least one terminal located on an edge of at least one neighboring cell.

11. The method of claim 8 , wherein the first beamformer is determined in consideration of interference exerted on a terminal by a serving base station of the terminal.

12. The method of claim 8 , further comprising transmitting long-term channel information measured based on the beamformed reference signals to the base station for determination of a network utility, determination of a multi-cell sum utility, and network sum-proportional fair (PF) maximization.

13. The method of claim 8 ,

wherein the first beamformer, that is a sum-mean square error (MSE) based beamformer, is determined based on the long-term channel information,

wherein the second beamformer, that is a weighted minimum mean square error (MMSE) based beamformer, is determined based on the short-term channel information, and

wherein the vertical reference signals and the horizontal reference signals are transmitted and received through a resource different from a resource for transmitting vertical reference signals and horizontal reference signals transmitted from a neighboring base station.

14. A base station in a wireless communication system, the base station comprising:

a transceiver; and

at least one processor operably coupled to the transceiver, wherein the at least one processor is configured to:

transmit vertical reference signals and horizontal reference signals that are generated based on an interference relationship between terminals,

receive long-term channel information determined by using the vertical reference signals and the horizontal reference signals,

transmit reference signals beamformed by a first beamformer generated based on the long-term channel information,

receive short-term channel information determined by using the beamformed reference signals, and

transmit a data signal beamformed by a second beamformer generated based on the short-term channel information.

15. The base station of claim 14 , further comprising:

a backhaul communication unit configured to receive, from another base station, long-term channel information for a serving terminal of the another base station for cooperative communication with the another base station.

16. The base station of claim 14 , wherein the transceiver is configured to:

receive uplink reference signals from the terminals in order to determine the interference relationship between the terminals.

17. The base station of claim 14 , wherein the at least one processor is further configured to:

group the terminals in consideration of at least one terminal located on an edge of at least one neighboring cell.

18. The base station of claim 14 , wherein the at least one processor is further configured to:

control to transmit long-term channel information for an interference cell, which is received from a serving terminal, to at least one of a neighboring base station or a central station.

19. The base station of claim 14 , wherein the at least one processor is further configured to:

receive, from a terminal, information for interference exerted on the terminal by a serving base station of the terminal, and

determine the first beamformer in consideration of the information for the interference.

20. The base station of claim 14 , wherein the at least one processor is further configured to:

determine the first beamformer that is a sum-mean square error (MSE) based beamformer, based on the long-term channel information, and

determine the second beamformer that is a weighted minimum mean square error (MMSE) based beamformer, based on the short-term channel information,

wherein the vertical reference signals and the horizontal reference signals are transmitted and received through a resource different from a resource for transmitting vertical reference signals and horizontal reference signals transmitted from a neighboring base station.