That based on the quantized CSI transmitting data device and method

In the embodiments according to the present invention there is provided a device and method for transmitting data using a plurality of transmit antennas. The base station apparatus in consideration of the power of the quantization noise on the status information of the downlink channel generating a precoding matrix, and transmits the data to the terminal using the generated precoding matrix. Pre-coding, quantization, Quantize