Radio communication apparatus capable of switching modulation schemes

A radio communication apparatus for switching modulation schemes, comprising:

• a 16QAM modulation signal generator configured to modulate transmission data by a 16QAM scheme and to output a 16QAM 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 16QAM modulation signal, and an average transmission power of the QPSK modulation signal is greater than an average transmission power of the 16QAM modulation signal;
• a radio processor configured to receive, as an input, the 16QAM 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 16QAM modulation signal, and the maximum signal point amplitude of the QPSK modulation signal does not exceed the maximum signal point amplitude of the 16QAM modulation signal.

A radio communication method for switching modulation schemes, comprising:

• modulating transmission data by a 64QAM scheme and outputting a 64QAM modulation signal;
• modulating transmission data by a QPSK modulation scheme and outputting 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;
• receiving, as input, the 64QAM modulation signal or the QPSK modulation signal, and outputting a transmission signal;
• and
• amplifying a transmission signal of the QPSK modulation signal and outputting 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.

A radio communication method for switching modulation schemes, comprising:

• modulating transmission data by a 16QAM scheme and outputting a 16QAM modulation signal;
• modulating transmission data by a QPSK modulation scheme and outputting 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 16QAM modulation signal, and an average transmission power of the QPSK modulation signal is greater than an average transmission power of the 16QAM modulation signal;
• receiving, as an input, the 16QAM modulation signal or the QPSK modulation signal, and outputting a transmission signal;
• and
• amplifying a transmission signal of the QPSK modulation signal and outputting 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 16QAM modulation signal, and the maximum signal point amplitude of the QPSK modulation signal does not exceed the maximum signal point amplitude of the 16QAM modulation signal.