SPREAD SPECTRUM COMMUNICATION SYSTEM APPARATUS

摘要

In an adaptive modulation communication, a reception apparatus need not always operate the function corresponding to a mode (64 QAM) most sensitive to accuracy deterioration. In a spread spectrum communication system, a controller (104) reads a demodulation method from a control signal specifying the modulation method (QPSK, 16−QAM, 64−QAM) and according to the demodulation method which has been read, the following are controlled: the sample rate of an A/D converter (111) and a de−spreader (102), the number of pilot symbols used by a propagation path estimation block (106), and the number of pilot symbols de−spread by the de−spreader (102). Thus, when the demodulation method is other than the 64−QAM, the sample rate can be set in accordance with the QPSK or 16−QAM and there is no need of operating the function corresponding to the 64−QAM all the time.