A Band-Divided Memory Polynomial for Wideband Digital Predistortion With Limited Bandwidth Feedback

作者：Zhang, Qi^*; Liu, Youjiang; Zhou, Jie; Jin, Shubo; Chen, Wenhua; Zhang, Silong

来源：IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS, 2015, 62(10): 922-926.

DOI：10.1109/TCSII.2015.2457793

• Band-limited
• digital predistortion (DPD)
• memory polynomial (MP)
• power amplifiers (PAs)
• roll-off

With a real analog bandpass filter (BPF) in the feedback loop, band-limited digital predistortion (DPD) normally uses a narrower bandwidth low-pass filter at baseband to further constrain the bandwidth of the power amplifier (PA) output signal. This discards the nonlinear information at the BPF's roll-off regions. The PA's spectral regrowth at the edge of the BPF is thus unable to be suppressed with the conventional band-limited DPD. To make efficient use of digital-to-analog converter/analog-to-digital converter sampling rate without losing information at the BPF's roll-off regions, this brief proposes a band-divided DPD method, in which the restricted feedback bandwidth is divided into two parts in frequency domain-center and border regions of PA's band-limited output. These two parts are characterized separately using two different basis functions with a band-divided memory polynomial (BDMP) model. It provides higher flexibility in selecting the digital band-limiting filter's bandwidth and also reduces the filter order. The measurement results for a class-AB GaN PA with orthogonal frequency division multiplexing signal of 60-MHz bandwidth have shown the superiority of BDMP DPD over the previous state-of-the-art.

• 出版日期2015-10
• 单位清华大学; 中国科学院电工研究所; 中国工程物理研究院