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Adaptive polynomial predistorters and low-PAR circular APK signaling schemes for systems using non-linear power amplifiers.

机译:适用于使用非线性功率放大器的系统的自适应多项式预失真器和低PAR圆形APK信令方案。

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摘要

In this thesis, adaptive polynomial predistortion techniques suitable for DSP implementation at the baseband signals are introduced to counter-balance the AM/AM and AM/PM nonlinear effects of the transmit power amplifier. The proposed polynomial predistortion scheme is based on polar coordinate representation. Both LMS and RLS concepts are used to derive the adaptive algorithms. An enhanced LMS-based algorithm with fast convergence is proposed. For very fast convergence, a cascaded RLS-based adaptive polynomial predistorter structure is introduced. The obtained results show that the polynomial predistortion schemes can be used in M-QAM transmitters with power amplifiers operating near saturation to achieve a highest power efficiency. The thesis also presents a class of circular M-ary Amplitude-Phase Shift Keying (APK) signaling techniques with high bandwidth efficiency and low peak-to-average power ratio (PAR) suitable for systems using non-linear power amplifiers to achieve high power efficiency. Based on bandlimited two-dimensional M-ary signals using circular constellations, a search algorithm for optimum schemes for non-linear amplification in terms of minimum PAR and maximum DPR is introduced. Optimum circular constellations for 8-, 16-, 32-, 64- and 128-APK signalling schemes are proposed. The analytical and simulation results show that this class of circular M-ary APK signals outperforms the square and cross M-ary QAM schemes.
机译:本文提出了适合于基带信号的DSP实现的自适应多项式预失真技术,以平衡发射功率放大器的AM / AM和AM / PM非线性效应。所提出的多项式预失真方案基于极坐标表示。 LMS和RLS概念都用于导出自适应算法。提出了一种改进的基于LMS的快速收敛算法。为了实现非常快的收敛,引入了一种基于级联RLS的自适应多项式预失真器结构。获得的结果表明,多项式预失真方案可用于功率放大器接近饱和的M-QAM发射机中,以实现最高的功率效率。本文还提出了一类具有高带宽效率和低峰均功率比(PAR)的圆形M元幅度相移键控(APK)信令技术,适用于使用非线性功率放大器实现高功率的系统效率。基于使用圆形星座的带限二维M元信号,介绍了一种针对最小放大率和最大DPR的非线性放大最佳方案的搜索算法。提出了用于8、16、32、64和128 APK信号方案的最佳圆形星座图。分析和仿真结果表明,此类圆形Mary APK信号优于方形和交叉Mary QAM方案。

著录项

  • 作者

    Vo, Thai Hoa.;

  • 作者单位

    Concordia University (Canada).;

  • 授予单位 Concordia University (Canada).;
  • 学科 Engineering Electronics and Electrical.
  • 学位 M.A.Sc.
  • 年度 2003
  • 页码 98 p.
  • 总页数 98
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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