A new signal injection method with PSO for multi-carrier predistortion

作者：Wu, Xiaofang^*; Wang, Wei; Xu, Yun; Yuan, Jiangnan

来源：IEICE Electronics Express, 2013, 10(19): 20130595.

DOI：10.1587/elex.10.20130595

• signal injection
• particle swarm optimization
• power amplifier
• digital predistortion

In multi-carrier transmitters, nonlinear characteristic of power amplifiers (PAs) results in intra-band distortion and inter-band distortion. The intra-band distortion exists in most single-carrier transmitters as well, and can be removed by traditional digital predistortion (DPD) techniques. However, the inter-band distortion is rather unique for the multi-carrier linearization. A channel-selective multi-cell DPD architecture which deals with the intra-band and inter-band distortion separately is used in this paper. Furthermore, a new signal injection method with particle swarm optimization (PSO) is proposed to suppress the inter-band distortion in the paper. The injected inter-band signals are firstly reconstructed by a memory polynomial DPD, and then their amplitude and phase are fine-tuned by a PSO algorithm. Simulation results show that the method restrains inter-band distortion significantly and accelerates the convergence speed of PSO algorithm.

• 单位
  厦门大学; 厦门理工学院