Communication system and method for adaptive modulation and coding, which pilot narrow supports and on ack / nack based modulation - and coding schemes decides

摘要

PURPOSE: A mobile communication system and a method for increasing communication efficiency are provided to reduce the delay of channel information by grouping a MCS(Modulation and Coding Scheme) level at a receiving unit to supply broad channel information to a transmitting side. CONSTITUTION: A demodulation and decoding unit(82) demodulates and decodes an information signal to detect CRC(Cyclic Redundancy Channel) data and information data for checking an error contained in the information signal. A channel quality measurement unit(84) uses a pilot signal to measure the data transfer capacity of the data channel receiving the information signal. An MCS group selecting control unit(86) groups n(0) numbers of previously defined MCS levels as m(nm0) numbers of continuous MCS levels according to the performance of the data channel, draws MCS group information according to the channel quality as a predetermined period, and transfers an ACK or a NACK signal according to a normal reception of the CRC data to a transmitting unit.