基于SoC的可重构短波功放数字预失真线性化
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摘要
在对功率放大器的非线性放大特性研究的基础上,提出了在SoC为核心的硬件平台上对短波功放进行可重构预失真线性化的方法。文章重点对改进型Hammerstein模型进行了改进,修改后的模型不仅在硬件上易于实现,而且具备模式切换功能,可以根据需求选择不同的有记忆模型或无记忆模型。实验结果证实了修改后的模型能有效地抑制短波功放的带外寄生辐射。提出的基于SoC硬件平台的预失真线性化实现方案可以很方便地实现各种不同的预失真非线性模型,节省系统硬件资源,具有重要的工程实际应用价值。
Based on the research of nonlinear amplification characteristics of power amplifiers, a reconfigurable predistortion linearization method for short-wave power amplifiers on a hardware platform with a SoC as the core is proposed in this paper. The paper focuses on improving the augmented Hammerstein model. The modified model is not only easy to be implemented on hardware, but also has a mode switching function, which can be selected as a memory model or a memoryless model according to application requirements. The experiment results illustrate that the modified model can effectively suppress the out-of-band spurious radiation of the short-wave power amplifier. The predistortion linearization scheme based on SoC hardware platform proposed in this paper can be easily applied to implement various predistortion nonlinear models. It can economize the hardware resources for the system and has important practical engineering application value.
Based on the research of nonlinear amplification characteristics of power amplifiers, a reconfigurable predistortion linearization method for short-wave power amplifiers on a hardware platform with a SoC as the core is proposed in this paper. The paper focuses on improving the augmented Hammerstein model. The modified model is not only easy to be implemented on hardware, but also has a mode switching function, which can be selected as a memory model or a memoryless model according to application requirements. The experiment results illustrate that the modified model can effectively suppress the out-of-band spurious radiation of the short-wave power amplifier. The predistortion linearization scheme based on SoC hardware platform proposed in this paper can be easily applied to implement various predistortion nonlinear models. It can economize the hardware resources for the system and has important practical engineering application value.
引文
[1] 左卫.短波通信系统发展及关键技术综述[J].通信技术,2014(8):847-853 Zuo W.Review on pivotal technology and development of HF communication system[J].Communications Technology,2014(8):847-853
[2] 张文泉.第三代短波通信系统物理层研究与实现[D].西安:西安电子科技大学,2006 Zhang W Q.Research and implementation on the third generation HF communication physical layer[D].Xi′an:Xidian University,2006
[3] Liu T,Boumaiza S,Ghannouchi F M.Augmented hammerstein predistorter for linearization of broad-band wireless transmitters[J].IEEE Transactions on Microwave Theory & Techniques,2006,54(4):1340-1349
[4] Ding L,Zhou G T.Effects of even-order nonlinear terms on power amplifier modeling and predistortion linearization[J].IEEE Transactions on Vehicular Technology,2004,53(1):156-162
[5] Ding L,Zhou G T,Morgan D R,et al.A robust digital baseband predistorter constructed using memory polynomials[J].IEEE Trans on Communications,2004,52(1):159-165
[6] Kang H W,Yong S C,Youn D H.On compensating nonlinear distortions of an OFDM system using an efficient adaptive predistorter[J].IEEE Transactions on Communications,1999,47(4):522-526
[7] 胡挺,刘太君,叶焱,等.基于ARM+FPGA的短波功放数字预失真硬件平台设计[J].宁波大学学报(理工版),2017,30(5):48-52 Hu T,Liu T J,Ye Y,et al.ARM+FPGA hardware platform design for digital pre-distortion of shortwave power amplifiers[J].Journal of Ningbo University (Natural Science & Engineering Edition),2017,30(5):48-52
[8] Sanderson C,Curtin R.Armadillo:a template-based C++ library for linear algebra[J].Journal of Open Source Software,2016,1(2):26
[2] 张文泉.第三代短波通信系统物理层研究与实现[D].西安:西安电子科技大学,2006 Zhang W Q.Research and implementation on the third generation HF communication physical layer[D].Xi′an:Xidian University,2006
[3] Liu T,Boumaiza S,Ghannouchi F M.Augmented hammerstein predistorter for linearization of broad-band wireless transmitters[J].IEEE Transactions on Microwave Theory & Techniques,2006,54(4):1340-1349
[4] Ding L,Zhou G T.Effects of even-order nonlinear terms on power amplifier modeling and predistortion linearization[J].IEEE Transactions on Vehicular Technology,2004,53(1):156-162
[5] Ding L,Zhou G T,Morgan D R,et al.A robust digital baseband predistorter constructed using memory polynomials[J].IEEE Trans on Communications,2004,52(1):159-165
[6] Kang H W,Yong S C,Youn D H.On compensating nonlinear distortions of an OFDM system using an efficient adaptive predistorter[J].IEEE Transactions on Communications,1999,47(4):522-526
[7] 胡挺,刘太君,叶焱,等.基于ARM+FPGA的短波功放数字预失真硬件平台设计[J].宁波大学学报(理工版),2017,30(5):48-52 Hu T,Liu T J,Ye Y,et al.ARM+FPGA hardware platform design for digital pre-distortion of shortwave power amplifiers[J].Journal of Ningbo University (Natural Science & Engineering Edition),2017,30(5):48-52
[8] Sanderson C,Curtin R.Armadillo:a template-based C++ library for linear algebra[J].Journal of Open Source Software,2016,1(2):26