Devices and methods for transmitting and receiving data using precoding matrix

摘要

A communication system to feed back an index of a precoding matrix is provided. A terminal may feed back an index of an optimal precoding matrix based on estimated channel status. A base station may transmit data to the terminal based on the index of the precoding matrix received from the terminal.

主权项

1. A terminal, comprising:
a channel estimator configured to estimate the status of an interference channel between the terminal and an interference base station and to estimate the status of a serving channel between the terminal and a serving base station; a selector configured to select an index of a precoding matrix based on the status of the interference channel and the status of the serving channel; a transmitter configured to transmit the selected index of the precoding matrix to the serving base station; a receiver configured to receive data from the serving base station based on the index of the precoding matrix; an autocorrelation matrix generator configured to generate an autocorrelation matrix of the interference channel based on the status of the interference channel; and a space divider configured to divide the autocorrelation matrix of the interference channel into a signal space and a null space, wherein the selector is further configured to select a precoding candidate vector from among vectors included in the null space, and wherein the selector is further configured to select, as the index of the precoding matrix, an index of a vector that is most similar to the precoding candidate vector, from among vectors included in the precoding matrix.