A Baseband Modem Apparatus Suitable for Bluetooth System by using OFDM Modem

摘要

PURPOSE: A device for modulating and demodulating a base band at a bluetooth system by using an orthogonal frequency division multiplexing(OFDM) is provided to supply a high speed variable data rate at the bluetooth system and to apply the bluetooth system requiring the high speed data rate. CONSTITUTION: A device for modulating and demodulating a base band at a bluetooth system by using an orthogonal frequency division multiplexing(OFDM) includes an OFDM modulating block(2), an OFDM modulating control block(200), an OFDM demodulating block(3) and an OFDM demodulating control block(300). In the device, the OFDM modulating block(2) modulates the data transmitted from the link manager to at a variable data rate by the OFDM method. The OFDM modulating control block(200) controls the OFDM modulating block(2) in response to the variable data rate assigned at the link manager and controls the output power of radio frequency. The OFDM demodulating block(3) extracts the variable data rate from the OFDM signal received as the radio frequency and demultiplexes the received data by the variable data rate to transmit the demultiplexed data to the link manage. And, the OFDM demodulating control block(300) controls the OFDM demodulating block(3) in response to the extracted variable data rate and reduces the power consumption of the OFDM demodulating block(3) by comparing the data rate used at the OFDM modulating block(2).