APPARATUS AND METHOD OF MODULATION TECHNIQUE SELECTION FOR EACH CHANNEL BASED ON SIGNAL TO NOISE RATION IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM

摘要

PURPOSE: A channel-wise modulation scheme selection device and a method thereof in an OFDM(Orthogonal Frequency Division Multiplexing) system are provided to control a data transmission rate of data. CONSTITUTION: A receiving terminal (200) includes a preamble signal reception unit (210), a channel state information measurement unit(220), a signal to noise ratio estimation unit(230), and a feedback processing unit(240). The preamble signal reception unit receives a preamble signal which is periodically transmitted to a transmitting terminal. The channel state information measurement unit measures channel state information from the received preamble signal. The signal to noise ratio estimation unit estimates a signal to noise ratio from the measured channel state information. The feedback processing unit feedback-processes the estimated signal to noise ratio to the transmitting terminal. [Reference numerals] (210) Preamble signal reception unit; (220) Channel state information measurement unit; (230) Signal to noise ratio estimation unit; (240) Feedback processing unit