A method for a wireless device capable of receiving and transmitting a signal includes receiving a reference signal from a second wireless device through a communication channel, estimating the communication channel, using the reference signal, selecting a pair of an analog digital converter (ADC) quantizer and an input distribution, based on the estimated communication channel, and sending information on the selected input distribution and the ADC quantizer to the second wireless device. A wireless device capable of wirelessly receiving and transmitting a signal includes a transceiver configured to receive a reference signal from a second wireless device through a communication channel, and a processor configured to estimate the communication channel, using the reference signal, selecting a pair of an ADC quantizer and an input distribution, based on the estimated communication channel, and sending information on the selected input distribution and the ADC quantizer to the second wireless device.