Method for transmitting sounding reference signal in multiple antenna wireless communication system and apparatus therefor
A method and a user equipment (UE) for transmitting sounding reference signals via multiple antenna ports in a wireless communication system are discussed. The method according to one embodiment includes receiving a parameter via a higher layer; applying a code division multiplexing (CDM) scheme to the sounding reference signals using the parameter; applying a frequency division multiplexing (FDM) scheme to the sounding reference signals when the parameter is a first value; and transmitting the sounding reference signals via the multiple antenna ports.
1. A method for transmitting sounding reference signals via multiple antenna ports by a user equipment (UE) in a wireless communication system, the method comprising:
receiving a parameter for calculating cyclic shift values via a higher layer;
applying a code division multiplexing (CDM) scheme to the sounding reference signals corresponding to the multiple antenna ports using the parameter;
applying a frequency division multiplexing (FDM) scheme to the sounding reference signals corresponding to the multiple antenna ports when the parameter has a first value; and
transmitting the sounding reference signals on a last symbol of a subframe via the multiple antenna ports.
2. The method of claim 1 , wherein, when the parameter has a second value, the FDM scheme is not applied to the sounding reference signals.
3. The method of claim 2 , wherein the first value is one of integers between 4 and 7, and the second value is one of integers between 0 and 3.
4. The method of claim 1 , wherein the applying the CDM scheme to the sounding reference signals corresponding to the multiple antenna ports using the parameter comprises:
calculating the cyclic shift values using the parameter; and
generating the sounding reference signals using corresponding to the multiple antenna ports the cyclic shift values.
5. A user equipment (UE) in a wireless communication system, the UE comprising:
a processor configured to:
configure a parameter for calculating cyclic shift values via a higher layer,
apply a code division multiplexing (CDM) scheme to sounding reference signals corresponding to multiple antenna ports using the parameter, and
apply a frequency division multiplexing (FDM) scheme to the sounding reference signals corresponding to the multiple antenna ports when the parameter has a first value; and
an RF (Radio Frequency) transceiver configured to transmit the sounding reference signals on a last symbol of a subframe via the multiple antenna ports.
6. The UE of claim 5 , wherein, when the parameter has a second value, the FDM scheme is not applied to the sounding reference signals.
7. The UE of claim 5 , wherein the first value is one of integers between 4 and 7, and the second value is one of integers between 0 and 3.
8. The UE of claim 5 , wherein:
the cyclic shift values are calculated using the parameter, and
the sounding reference signals corresponding to the multiple antenna ports are generated by using the cyclic shift values.