4、射频功率放大器 射频功率放大器需要处理的信号,在时域中具有类似白噪声信号的特征,其包络峰值电平不是恒定的,峰值幅度瞬间随机变化,可能达到很高的数值,没有固定的时间周期,在频域中具有高斯分布的频谱特性。 信号峰值幅度与积分平均值之比称为波峰系数,对于多载波的COFDM调制,理论上峰值功率与平均功率之比取决于副载波数N,波峰 4, RF power amplifier RF power amplifier signal to be processed in the time domain has a similar white noise signal characteristics, the envelope peak level is not constant, the peak amplitude of random changes in the moment, may reach high values, there is no fixed Of the time period, in the frequency domain has the spectral characteristics of Gaussian distribution. The ratio of the signal peak amplitude to the integral average is called the crest factor. For multi-carrier COFDM modulation, in theory the ratio of the peak power to the average power depends on the number of subcarriers, N, and the peak