On the significance of envelope peak-to-average ratio for estimating the spectral regrowth of an RF/microwave power amplifier
On the significance of envelope peak-to-average ratio for estimating the spectral regrowth of an RF/microwave power amplifier
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论包络峰均比对于估计射频/微波功率放大器频谱再生的重要性
DOI：
10.1109/22.904747
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发表时间：
2000
影响因子：
4.3
通讯作者：
M. Steer
中科院分区：
文献类型：
--
作者：
J. Sevic;M. Steer
信号的峰均比（PAR）通常用于估计射频/微波功率放大器表现出可接受的互调失真所需的回退。在本文中，它表明，PAR是一个不准确的度量预测回退，并可能导致不正确的选择调制的线性效率的权衡。基于IS-94码分多址通信（CDMA）反向链路和IS-95 CDMA前向链路无线标准，给出了一个具体的情况。使用模拟和负载牵引测量，它说明，虽然四相相移键控具有较高的PAR比偏移QPSK（O-QPSK），它具有较低的相邻信道功率，恒定的平均功率。这种观察，与预期相反，解释了通过引入包络分布函数，其特征在于基于所施加的信号的时域统计的放大器的饱和。
The peak-to-average ratio (PAR) of a signal is commonly used for estimating the backoff required for an radio-frequency/microwave power amplifier to exhibit acceptable intermodulation distortion. In this paper, it is shown that the PAR is an inaccurate metric for predicting the backoff and can lead to improper choices for modulation with respect to the linearity-efficiency tradeoff. A specific case is presented, based on the IS-94 code-division multiple-access communication (CDMA) reverse-link and IS-95 CDMA forward-link wireless standards. Using simulation and load-pull measurements, it is illustrated that although quaternary phase-shift keying has a higher PAR than offset QPSK (O-QPSK), it has lower adjacent-channel power, for constant average power. This observation, contrary to what is expected, is explained by introducing the envelope distribution function, which characterizes the saturation of an amplifier based on the time-domain statistics of the applied signal.