2D forward twin nonlinear two-box model for concurrent dual-band digital predistortion
2D forward twin nonlinear two-box model for concurrent dual-band digital predistortion
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DOI：
10.1109/pawr.2014.6825742
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发表时间：
2014-06
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影响因子：
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通讯作者：
Christophe Quindroit;Naveen Naraharisetti;P. Roblin;S. Gheitanchi;V. Mauer;M. Fitton
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文献类型：
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作者：
Christophe Quindroit;Naveen Naraharisetti;P. Roblin;S. Gheitanchi;V. Mauer;M. Fitton
本文提出了一种双频带前向双非线性二盒模型来补偿并发双频带信号模式下功率放大器的非线性。通过考虑非线性记忆效应，新的双频数字预失真（DPD）架构提高了2D-Hammerstein模型的线性化性能，同时与2D-DPD模型相比降低了复杂性。还提出了基于FPGA的实验测试台。使用 10W 峰值功率放大器和中心频率间隔 310MHz 的双频信号（单载波 LTE 和 3 载波 WCDMA）来评估和比较线性化和复杂性性能。结果表明，复杂性降低，同时实现了与 2D-DPD 相似的性能。相邻信道功率比 (ACPR) 降至 -50 dBc 以下，归一化均方误差 (NMSE) 接近 -40 dB。
In this paper, a dual-band forward twin nonlinear two-box model is proposed to compensate for the nonlinearity of the power amplifier in concurrent dual-band signal mode. By taking into account nonlinear memory effects, the new dual-band digital predistortion (DPD) architecture improves the linearization performances of the 2D-Hammerstein model while reducing the complexity compared to the 2D-DPD model. An experimental test bench based on an FPGA is also presented. Linearization and complexity performances are evaluated and compared using a 10W peak power amplifier and a dual-band signal (single-carrier LTE and 3-carrier WCDMA) center frequency spaced by 310MHz. Results show a reduced complexity while achieving similar performances as 2D-DPD. Adjacent channel power ratios (ACPRs) are reduced below -50 dBc and normalized mean square error (NMSE) close to -40 dB.