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arXiv 1810.04490eess.SP
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基于干扰利用的抗相位误差的混合预编码

Interference Exploitation-based Hybrid Precoding with Robustness Against Phase Errors

Ganapati Hegde, Christos Masouros, Marius Pesavento

摘要:

与全数字预编码相比,混合模拟-数字预编码显著降低了大规模多输入多输出收发器中的硬件成本,但代价是增加了发射功率。为了减轻上述不足,我们使用的概念,建设性的基于干扰的预编码,这已被证明提供显着的传输功率节省相比,传统的基于干扰抑制的预编码在全数字多用户MIMO系统。此外,为了规避潜在的服务质量下降的用户由于在发射机的硬件损伤,我们明智地将鲁棒性对这种脆弱性的预编码器设计。由于所承担的建设性干扰的鲁棒混合预编码问题是非凸的无限约束,因此难以最优解决,我们分解成两个子任务,即模拟预编码和数字预编码。在本文中,我们提出了一种算法来计算最佳的建设性的干扰为基础的鲁棒数字预编码器。此外,我们设计了一个计划,以促进所提出的算法在一个低复杂度和分布式的方式实现。我们还讨论了块级模拟预编码技术。仿真结果表明,该算法及其实现方案优于国家的最先进的方法。

英文摘要:

Hybrid analog-digital precoding significantly reduces the hardware costs in massive MIMO transceivers when compared to fully-digital precoding at the expense of increased transmit power. In order to mitigate the above shortfall, we use the concept of constructive interference-based precoding, which has been shown to offer significant transmit power savings when compared with the conventional interference suppression-based precoding in fully-digital multiuser MIMO systems. Moreover, in order to circumvent the potential quality-of-service degradation at the users due to the hardware impairments in the transmitters, we judiciously incorporate robustness against such vulnerabilities in the precoder design. Since the undertaken constructive interference-based robust hybrid precoding problem is nonconvex with infinite constraints and thus difficult to solve optimally, we decompose the problem into two subtasks, namely, analog precoding and digital precoding. In this paper, we propose an algorithm to compute the optimal constructive interference-based robust digital precoders. Furthermore, we devise a scheme to facilitate the implementation of the proposed algorithm in a low-complexity and distributed manner. We also discuss block-level analog precoding techniques. Simulation results demonstrate the superiority of the proposed algorithm and its implementation scheme over the state-of-the-art methods.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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