Adaptive pre- and post-compensation of nonlinear distortions for high-level data Modulations
Adaptive pre- and post-compensation of nonlinear distortions for high-level data Modulations
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高级数据调制非线性失真的自适应预补偿和后补偿
DOI：
10.1109/twc.2004.834706
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发表时间：
2004
影响因子：
10.4
通讯作者：
V. Lottici
中科院分区：
文献类型：
--
作者：
L. Giugno;M. Luise;V. Lottici
在这封信中，我们展示了如何将不同的信号处理技术结合起来，以优化具有频谱效率的高级调制技术的典型宽带非线性卫星链路的性能。特别地，我们遵循两种并行的方法：一方面，我们以特殊幅度和相移键控（APSK）星座的形式追求信号优化，以减少非线性失真的影响；另一方面，我们分析了发送端自适应数据预失真（DP）和接收端自适应非线性均衡（NLE）的可行性。我们证明了使用这种优化的星座减轻了非线性补偿技术的复杂性，并且我们还表明，通过巧妙地采用这些技术，我们还表明，非编码和涡轮编码正交调幅和APSK星座的非线性失真敏感性大大降低。
In this letter, we show how different signal processing techniques can be combined to optimize the performance of a typical wideband nonlinear satellite link with spectrally efficient high-level modulation techniques. In particular, we follow two concurrent approaches: on one side, we pursue signal optimization in the form of special amplitude and phase shift keying (APSK) constellations to reduce the effect of nonlinear distortions, while on the other, we analyze the feasibility of adaptive data predistortion (DP) at the transmitter and adaptive nonlinear equalization (NLE) at the receiver. We demonstrate that the use of such optimized constellations relieves the complexity of the nonlinearity compensation techniques, and we also show that by clever adoption of these techniques the sensitivity to nonlinear distortion of both uncoded and turbo coded quadrature amplitude modulation and APSK constellations is greatly reduced.