Orthogonal precoding constitutes a powerful technique to reduce spectrum sidelobes of multicarrier signals. This reduction is bought at the cost of introducing precoder redundancy, which results in some throughput loss and additional precoding/decoding complexity. When the goal is to meet some spectral emission mask constraints, it is desirable to avoid unnecessary sidelobe suppression in order to keep precoder redundancy at a minimum. In this context, we introduce a general framework under which we develop a novel Lagrange multiplier-based mask-compliant orthogonal precoder design targeting minimal redundancy. We also adapt to this framework two previously proposed designs based on spectral notches and minimum out-of-band emission, respectively, to explicitly incorporate mask constraints. Simulation results are provided to show the effectiveness of the proposed designs under different practical masks for multicarrier wireless systems.

中文翻译：

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频谱有效OFDM的符合掩码要求的正交预编码

正交预编码构成了一种强大的技术，可以减少多载波信号的频谱旁瓣。这种减少的购买是以引入预编码器冗余为代价的，这导致一些吞吐量损失和附加的预编码/解码复杂性。当目标是满足某些频谱发射掩模约束时，希望避免不必要的旁瓣抑制，以将预编码器冗余保持在最低水平。在这种情况下，我们介绍了一个通用框架，在该框架下，我们开发了一种基于Lagrange乘数的，基于掩码的，符合模板的正交预编码器设计，旨在实现最小冗余。我们还分别基于频谱陷波和最小带外发射，将两个先前提出的设计与该框架相适应，以明确纳入掩模约束。