Qam transmitter with improved power efficiency and wireless communication device equipped with the same

A quadrature amplitude modulation (QAM) transmitter comprising:

• a first quadrature phase shift keying (QPSK) generator configured to generate a first QPSK signal having a preset reference magnitude;
• a second QPSK generator configured to generate a second QPSK signal having the reference magnitude;
• a first amplifier configured to receive the first QPSK signal, amplify power thereof, and output the power amplified signal, but operate in a saturation region;
• a second amplifier configured to receive the second QPSK signal, amplify power thereof, and output the power amplified signal, but operate in a saturation region;
• and
• a power combining unit configured to synthesize a quadrature amplitude modulation (QAM) signal by combining the first QPSK signal output from the first amplifier and the second QPSK signal output from the second amplifier at a terminating end.

A high-order quadrature amplitude modulation (QAM) transmitter comprising:

• M quadrature phase shift keying (QPSK) generators each of which is configured to generate an independent QPSK signal;
• M amplifiers each of which is configured to receive an independent QPSK signal, amplify the power thereof, and output a preset saturation power;
• and
• a power combining unit configured to synthesize a quadrature amplitude modulation (QAM) signal by combining M QPSK signals that respectively from the M amplifiers at a terminating end,
• wherein each of the M amplifiers is set to output a saturation power of 4k (k=0, 1, . . . , M−1).