Patent ID: 7738590
Filing Date: 2010-06-15
Classification: H03F,H04B,H04L

Abstract:
1. A radio communication apparatus for switching modulation schemes, comprising: a 64QAM modulation signal generator configured to modulate transmission data by a 64QAM scheme and to output a 64QAM modulation signal; a QPSK modulation signal generator configured to modulate transmission data by a QPSK modulation scheme and to output a QPSK modulation signal, such that a maximum signal point amplitude of the QPSK modulation signal does not exceed a maximum signal point amplitude of the 64QAM modulation signal, and an average transmission power of the QPSK modulation signal is greater than an average transmission power of the 64QAM modulation signal; a radio processor configured to receive, as an input, the 64QAM modulation signal or the QPSK modulation signal, and to output a transmission signal; and a transmission power amplifier configured to amplify a transmission signal of the QPSK modulation signal and to output an amplified transmission signal of the QPSK modulation signal, such that the average transmission power of the QPSK modulation signal is greater than the average transmission power of the 64QAM modulation signal, and the maximum signal point amplitude of the QPSK modulation signal does not exceed the maximum signal point amplitude of the 64QAM modulation signal.