Decoding apparatus and method of terminal in wireless communication system

A channel decoding apparatus of a terminal in a wireless communication system, comprising:

• a carrier to interference and noise ratio (CINR) estimator for estimating a CINR value of a received signal;
• a controller for determining a range of available modulation and coding scheme (MCS) levels by including MCS level values that are higher than an MCS level which is set based on the estimated CINR value;
• and
• a decoder switch for determining whether an MCS level of a burst is included in the determined range of available MCS levels when the burst having no connection identifier (CID) information exists in a corresponding frame, by comparing a downlink interval usage code of the burst with a downlink interval usage code candidate set, and for decoding the burst when the MCS level of the burst is included in the determined range of available MCS levels,
• wherein a low estimated CINR value corresponds to a high MCS level.