COMMUNICATION TERMINAL DEVICE AND DRC SIGNAL TRANSMISSION METHOD

摘要

There is provided a communication terminal device for suppressing deterioration of throughput in a high-speed transmission system. In this communication terminal device, an inverse-spread unit (301) executes inverse spread by using a predetermined spread signal for a DRC threshold value component in a reception base band signal. A DRC threshold value detection unit (302) detects a DRC threshold value from the output signal from the inverse-spread unit (301). A DRC signal selection unit (303) selects a DRC value indicating a data rate appropriate for the reception quality CIR of the downstream line measured by a reception quality measuring unit (1710). If the selected DRC value is not smaller than the DRC threshold value, the DRC value is given to a DRC signal generation unit (1712). If the selected DRC value is smaller than the DRC threshold value, the DRC value is not given to the DRC signal generation unit (1712).