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Joint spectral-spatial precoders in MIMO-OFDM transmitters

机译:MIMO-OFDM发射机中的联合频谱空间预编码器

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摘要

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.
机译:这项工作研究了频谱预编码的联合设计,以避免在MIMO-OFDM系统中频谱带外发射和空间预编码,以抑制空间多用户干扰。在当前的最新技术方法中,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。相反,本文提出了信号的联合预编码以获得更好的性能。我们从频谱特性,系统频谱效率和发射机复杂性方面分析了建议的预编码器的性能。我们特别表明,有趣的是,所提出的联合最大比率预编码器具有两个独立且连续的频谱和空间预编码器组的简单发送器结构,实际上,它们可以独立设计,而在零强制关闭情况下架子式预编码器远非最佳。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。

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