Digital predistortion (DPD) has played an important role in current forth-generation (4G) mobile system to enhance the linearity of power amplifier (PA) and is expected to continue its functionality in forth-coming 5G. However, large signal bandwidth in 5G scenario complicates the implementation of DPD, especially the feedback path which DPD employs to observe PA output. In this paper, a novel feedback strategy is proposed for DPD of future wideband power amplifier (PA), using ADC with low sampling rate and narrow analog bandwidth. Some issues on practical hardware implementation are addressed to strengthen the realizability of our proposed approach. Simulation results show that similar linearization performance of PA can be achieved compared to conventional DPD, with much lower feedback cost.
A Novel Digital Predistortion of 5G Wideband Power Amplifier with Narrow Bandwidth ADC
2018-06-01
725887 byte
Conference paper
Electronic Resource
English
British Library Conference Proceedings | 2013
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