论文标题

大型阵列系统中取消非线性功率扩增失真的Z3RO家族的Z3RO家族

The Z3RO Family of Precoders Cancelling Nonlinear Power Amplification Distortion in Large Array Systems

论文作者

Rottenberg, François, Callebaut, Gilles, Van der Perre, Liesbet

论文摘要

大型阵列系统使用大量的天线元素和巧妙的预编码器设计,以在用户位置获得阵列增益。这些先编码器需要线性前端,更具体地说是线性功率放大器(PAS),以避免失真。这降低了能源效率,因为PA最有效接近饱和,它们会产生大多数非线性失真。此外,使用常规预编码器可以在用户位置诱导失真的连贯组合,从而降低信号质量。在这项工作中,提出了易于计算和实现的新型线性预编码器,允许在接近饱和的同时取消PA的三阶非线性,而没有信号统计和PA模型的先验知识。它们的设计包括故意饱和单个或几个天线,以及相对于所有其他天线的负增益,以补偿用户位置的总体非线性失真。与最大比率传输(MRT)预编码和完美的每数字前启动前(DPD)补偿相比,设计的性能提高对于接近饱和的PA具有显着性。

Large array systems use a massive number of antenna elements and clever precoder designs to achieve an array gain at the user location. These precoders require linear front-ends, and more specifically linear power amplifiers (PAs), to avoid distortion. This reduces the energy efficiency since PAs are most efficient close to saturation, where they generate most nonlinear distortion. Moreover, the use of conventional precoders can induce a coherent combining of distortion at the user locations, degrading the signal quality. In this work, novel linear precoders, simple to compute and to implement, are proposed that allow working close to saturation, while cancelling the third-order nonlinearity of the PA without prior knowledge of the signal statistics and PA model. Their design consists in saturating a single or a few antennas on purpose together with an negative gain with respect to all other antennas to compensate for the overall nonlinear distortion at the user location. The performance gains of the designs are significant for PAs working close to saturation, as compared to maximum ratio transmission (MRT) precoding and perfect per-antenna digital pre-distortion (DPD) compensation.

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