Mobile termile capable of efficiently measuring CNIR and CNIR measuring method thereof

A mobile terminal for measuring a carrier to noise and interference ratio (CNIR) of a subchannel in an orthogonal frequency division multiplexing (OFDM) mobile communication system, the mobile terminal comprising:

• a frequency offset and frame detector for detecting frame timing information and frequency offset from a received signal;
• a demodulator for demodulating the received signal by using the frame timing information and frequency offset detected by the frequency offset and frame detector;
• a subchannel separator for separating a data symbol from symbols outputted by the demodulator, the data symbol corresponding to a subchannel allocated to a corresponding mobile terminal;
• a channel estimating and equalizing unit for estimating and equalizing a channel for the corresponding subchannel from the data symbol separated from the subchannel separator and outputting the channel;
• and
• a CNIR measuring unit for transmitting a current CNIR to the base station after measuring the current CNIR by using a predetermined reference symbol (the reference symbol is selected to be one among the data symbol from the channel estimating and equalizing unit and the predetermined pilot between the base station and the mobile terminal according to the measured CNIR) and the data symbol outputted from the channel estimating and equalizing unit, and using the measured CNIR to determine the predetermined reference symbol used for measuring a subsequent CNIR.