1 GHz instantaneous bandwidth digital pre-distortion for multi-concurrent channel wideband power amplifiers
1 GHz instantaneous bandwidth digital pre-distortion for multi-concurrent channel wideband power amplifiers
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适用于多并发通道宽带功率放大器的 1 GHz 瞬时带宽数字预失真
DOI：
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
G. Hegazi
中科院分区：
文献类型：
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作者：
S. Velazquez;G. Hegazi
本文提出了一种极宽带数字预失真线性化（DPD）技术，使用自适应Volterra为基础的模型的非线性失真传递函数。该模型被参数化，以适应高阶项，如有必要准确地近似实际的宽带非线性传递函数。该算法使用矩阵和张量因子分解，通过识别和删除数学冗余并忽略对性能影响可忽略不计的模型组件来显着简化硬件实现的复杂性。这导致更少的乘法，并允许向模型添加更高阶项，而不会使复杂性呈指数增长。多相滤波技术也用于并行运行这些操作，这允许使用以与现成FPGA的能力相称的低得多的数据速率操作的信号处理的非常宽带的操作。测量结果的线性化技术的多载波并发波形到一个100 W的GaN功率放大器，表现出超过30 dB的瞬时带宽1 GHz的互调产物的改善。据我们所知，这是远远高于其他宽带DPD线性化技术在文献中公布的瞬时带宽。
This paper presents an extremely broadband digital predistortion linearization (DPD) technique that uses an adaptive Volterra-based model of the nonlinear distortion transfer function. The model is parameterized to accommodate higher order terms as necessary to accurately approximate the actual broadband nonlinear transfer function. The algorithm uses matrix and tensor factorizations to significantly simplify the complexity of the hardware implementation by identifying and removing mathematical redundancy and ignoring the components of the model that have negligible impact on the performance. This results in fewer multiplications and allows the addition of higher order terms to the model without the exponential growth in complexity. Polyphase filtering techniques are also used to run these operations in parallel which allows very broadband operation using signal processing operating at much lower data rate commensurate with the capabilities of off-the-shelf FPGAs. Measured results of the linearization technique are presented for multi-carrier concurrent waveforms into a 100 W GaN power amplifier showing an improvement in intermodulation products of more than 30 dB over an instantaneous bandwidth of 1 GHz. To our knowledge, this is far higher instantaneous bandwidth than other wideband DPD linearization techniques published in the literature.