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

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