A Spectrum-Sensing DPD Feedback Receiver With $30\times$ Reduction in ADC Acquisition Bandwidth and Sample Rate
A Spectrum-Sensing DPD Feedback Receiver With $30\times$ Reduction in ADC Acquisition Bandwidth and Sample Rate
复制标题
DOI：
10.1109/tcsi.2019.2920828
复制
发表时间：
2019-06
期刊：
影响因子：
--
通讯作者：
Nikolaus Hammler;A. Cathelin;P. Cathelin;B. Murmann
中科院分区：
文献类型：
--
作者：
Nikolaus Hammler;A. Cathelin;P. Cathelin;B. Murmann
提出了一种用于射频功率放大器数字预失真的反馈接收机。与传统结构相比，接收器在频域中采样。通过在每个采样间隔中随机选择频率区段，以显著较低的采集带宽和采样率来识别PA模型。该接收机原型采用28 nm FD-SOI技术实现，对于具有频谱再生的20 MHz长期演进信号，采样速率为4MS/S，而不是全奈奎斯特速率168MS/S。该样机在仅处理了约250个样本后，将一个4W小型基站功率放大器从−35dBc的相邻信道泄漏比线性化到−47.7dBc。
This paper presents a feedback receiver for the digital predistortion (DPD) of radio frequency (RF) power amplifiers (PAs). In contrast to conventional architectures, the receiver samples in the frequency domain. By randomly selecting a frequency bin in each sampling interval, the PA model is identified with substantially lower acquisition bandwidth and sampling rate. The receiver prototype is implemented in a 28-nm FD-SOI technology and samples at 4MS/s instead of the full Nyquist rate of 168MS/s for a 20-MHz Long Term Evolution (LTE) signal with spectral regrowth. The prototype is shown to linearize a 4-W small base station power amplifier from an adjacent channel leakage ratio (ACLR) of −35 dBc to −47.7 dBc, after processing only about 250 samples.