Abstract This work studies the joint design of spectral precoding, to avoid spectral out-of-band power emissions, and spatial precoding, to suppress spatial multiuser interference, in MIMO-OFDM systems. In current state-of-art approaches the transmit signals are precoded using two independently designed spectral and spatial precoders. In contrast this paper proposes a joint precoding of the signal to achieve a better performance. We analyse the performance of the proposed precoder in terms of spectral characteristics, system spectral efficiency and transmitter complexity. We show in particular that, interestingly, the proposed joint maximum-ratio precoder has a simple transmitter structure of two separate and consecutive banks of spectral and spatial precoders which in fact can be designed independently, while in case of zero-forcing the off-the-shelf precoders are far from the optimal. The joint zero-forcing precoder has a coupled structure and hence, we can not decompose it.

中文翻译：

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MIMO-OFDM 发射机中的联合频谱空间预编码器

摘要 本文研究了MIMO-OFDM系统中频谱预编码的联合设计，以避免频谱带外功率发射和空间预编码，以抑制空间多用户干扰。在当前最先进的方法中，使用两个独立设计的频谱和空间预编码器对发射信号进行预编码。相比之下，本文提出了对信号进行联合预编码以实现更好的性能。我们在频谱特性、系统频谱效率和发射机复杂度方面分析了所提出的预编码器的性能。我们特别表明，有趣的是，所提出的联合最大比预编码器具有简单的发射机结构，由两个独立且连续的频谱和空间预编码器组组成，实际上可以独立设计，而在强制为零的情况下，现成的预编码器远非最佳。联合迫零预编码器具有耦合结构，因此我们无法对其进行分解。