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首页> 外文会议>IEEE MTT-S International Microwave Symposium >A multi-stage concurrent dual-band DPD architecture for closely spaced carriers using a low bandwidth feedback loop
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A multi-stage concurrent dual-band DPD architecture for closely spaced carriers using a low bandwidth feedback loop

机译：使用低带宽反馈环路的紧密间隔载波的多级并发双频DPD架构

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摘要

In this paper, a novel multi-stage digital predistortion (DPD) with constrained feedback bandwidth is proposed. The proposed DPD effectively compensates for the nonlinear distortion in closely spaced multi-carrier power amplifiers (PAs). By extracting the PA static nonlinearity characteristics from the bandwidth-constrained signals and separately processing the multi-carriers input, the proposed DPD reduces the feedback bandwidth, which results in a reduction of the sampling rate. Moreover, while the DPD reduces the spectral regrowth in the adjacent channels, it effectively suppresses the spectral regrowth within the off-carrier regions along the transmission bandwidth. Experimental results have validated improved performance on a 60 MHz LTE-advanced signal, even when the analog to digital converter sampling rate is constrained to 61.44 Msps. Thus, the proposed technique can significantly decrease the difficulties in system design and reduce implementation cost.
机译：本文提出了一种具有反馈带宽受限的新型多级数字预失真（DPD）。提出的DPD有效补偿了近距离多载波功率放大器（PA）中的非线性失真。通过从带宽受限的信号中提取PA静态非线性特性并分别处理多载波输入，提出的DPD降低了反馈带宽，从而降低了采样率。而且，虽然DPD减少了相邻信道中的频谱再生长，但是它有效地抑制了沿着传输带宽的副载波区域内的频谱再生长。实验结果证明，即使模数转换器的采样率被限制为61.44 Msps，在60 MHz LTE先进信号上的性能也得到了改善。因此，所提出的技术可以大大减少系统设计的难度并降低实施成本。

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