Since the envelope of modulated signal fluctuates, unwanted intermodulation distortions generated when the signal is amplified by the nonlinear RF power amplifiers.

• 随着无线通信技术的飞速发展,出于对更高频谱利用率和更高功率效率的追求,线性调制技术和高效率的射频功率放大器得到了广泛应用。