MULTIPLE INPUT MULTIPLE OUTPUT COMMUNICATION SYSTEM USING CODEBOOK CORRESPONDING TO EACH REPORTING MODE

A communication method of a receiver in a wireless communication system, the communication method comprising obtaining a rank indicator; obtaining a first precoding matrix indicator based on the rank indicator; obtaining a second precoding matrix indicator associated with the first precoding matrix indicator; when the rank indicator is 1, transmitting the rank indicator, and transmitting the first precoding matrix indicator obtained based on a subset of a first codebook, the second precoding matrix indicator and a wideband channel quality index (CQI); and when the rank indicator is 2, transmitting the rank indicator, and transmitting the first precoding matrix indicator obtained based on a subset {0, 2, 4, 6, 8, 10, 12, 14} of the first codebook, the second precoding matrix indicator and a wideband channel quality index(CQI), wherein when the rank indicator is 1 or 2, the first precoding matrix indicator is 3 bits, and the second precoding matrix indicator is 1 bit.