Method for transmitting data in multiple antenna system
A method of transmitting data in a multiple antenna system includes transmitting a precoding matrix index (PMI) of a first user through a control channel for the first user, and transmitting the PMI of the first user and a PMI of a second user through a data channel for the first user. Effective data decoding is possible regardless of whether radio resources to be allocated to multiple users are partially or entirely allocated to the users.
1. A method of transmitting data in a multiple antenna system, the method comprising:
transmitting a precoding matrix index (PMI) of a first user through a control channel for the first user; and
transmitting the PMI of the first user and a PMI of a second user through a data channel for the first user by being multiplexed in a multiplex pilot,
wherein the multiplex pilot is generated based on a weight vector of the PMI of the first user multiplied by a sequence of the second user and a weight vector of the PMI of the second user multiplied by a sequence of the first user.
2. The method of claim 1 , wherein a radio resource allocated to the data channel for the first user partially overlaps with a radio resource allocated to a data channel for the second user.
3. The method of claim 1 , wherein a radio resource allocated to the data channel for the first user entirely overlaps with a radio resource allocated to a data channel for the second user.
4. The method of claim 1 , wherein the PMI of the first user and the PMI of the second user are transmitted through the data channel by being multiplexed in a multiplex pilot, and the multiplex pilot is expressed by:
X=W signal S interference +W interference S signal ,
where W signal denotes a weight vector of the PMI of the first user, S interference denotes a sequence of the second user, W interference denotes a weight vector of the PMI of the second user, and S signal denotes a sequence of the first user.
5. A method for processing data in a multiple antenna system, performed by a first user, the method comprising:
receiving a precoding matrix index (PMI) of the first user through a control channel;
receiving a multiplexed PMI through a data channel, wherein the PMI of the first user and a PMI of second user are multiplexed in the multiplexed PMI, and a radio resource for the data channel is partially or entirely shared with the second user;
de-multiplexing the PMI of the first user and the PMI of second user from the multiplexed PMI on the data channel by using the PMI of the first user on the control channel; and
reproducing data on the data channel by using the de-multiplexed PMI,
wherein the multiplexed PMI is received via a multiplex pilot,
and the multiplex pilot is generated based on a weight vector of the PMI of the first user multiplied by a sequence of the second user and a weight vector of the PMI of the second user multiplied by a sequence of the first user.
6. The method of claim 5 , wherein the multiplex pilot is expressed by:
X=W signal S interference +W interference S signal ,
where W signal denotes the weight vector of the PMI of the first user, S interference denotes the sequence of the second user, W interference denotes the weight vector of the PMI of the second user, and S signal denotes the sequence of the first user.