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A new modulator for digital RF power amplifiers utilizing a wavetable approach

机译:利用波表方法的数字射频功率放大器的新型调制器

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This paper presents for the first time a wavetable-based coding scheme to generate a high-speed binary input signal for digital RF power amplifiers. The approach maximizes the utilization of the time domain handling capabilities of the pulse forming circuit. Key features are a greatly improved output spectrum purity in comparison with common digital modulators, the ability to adjust the modulator to any given pulse forming hardware and a built-in signal correction option that comes without additional computational cost. To give a first impression on the modulators behavior and its possibilities to adapt to different hardware constraints, simulations are carried out for different parameter variations and for different baseband bandwidths. Furthermore, the proposed concept is emulated with an arbitrary waveform generator to gather additional measurement data. For a 5 MHz wideband code division multiple access (WCDMA) signal (6.5 dB peak-to-average power ratio) at 900 MHz, an error vector magnitude (EVM) of 0.26% and better than >58 dB adjacent channel leakage ratio (ACLR) were recorded. To the authors' knowledge, these are the best values achieved so far for a single-bit coding scheme without digital predistortion that still maintains maximum power coding efficiency.
机译:本文首次提出了一种基于波表的编码方案,以生成用于数字RF功率放大器的高速二进制输入信号。该方法最大程度地利用了脉冲形成电路的时域处理能力。与常见的数字调制器相比,主要功能是输出频谱的纯度大大提高,能够将调制器调整为任意给定的脉冲形成硬件,并且内置信号校正选项而无需额外的计算成本。为了对调制器的行为及其适应不同硬件限制的可能性产生第一印象,针对不同的参数变化和不同的基带带宽进行了仿真。此外,使用任意波形发生器模拟提出的概念,以收集其他测量数据。对于900 MHz时的5 MHz宽带码分多址(WCDMA)信号(6.5 dB峰均功率比),误差矢量幅度(EVM)为0.26%,并且优于> 58 dB的相邻信道泄漏率(ACLR) )进行记录。据作者所知,这些是迄今为止在没有数字预失真的情况下仍然保持最大功率编码效率的单位编码方案所能达到的最佳值。

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