Low-Complexity Radio Frontends and Noncoherent Detection for Massive MIMO

用于大规模 MIMO 的低复杂度无线电前端和非相干检测

• 批准号: 289265954
• 负责人: Professor Dr.-Ing. Robert Fischer
• 金额: --
• 依托单位: Institut für Mikrowellentechnik (MWT)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2016
• 资助国家: 德国
• 起止时间: 2015-12-31 至 2019-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/289265954?language=en
• 关键词: Low; Complexity; Radio; Frontends; Noncoherent

Multi-user communication systems with a central base station equipped with a very large number of receive antennas, so-called massive MIMO, are attaining more and more attention. The main challenges in such systems are the acquisition of accurate channel state information as well as the effort for realizing such systems, e.g., the distribuation of a high-quality LO-signal to the RF frontends. These problems can be overcome by applying noncoherent transmission schemes in particular, if low-complexity frontends may be used.Consequently, this proposal addresses the design and assessment of multi-user massive MIMO uplink systems. In particular, the interaction between the analog radio frontend and the employed joint detection algorithms has to be studied in detail. New insights, new results, and novel methods are expected, when treating these areas jointly. On the one hand, enhanced noncoherent detection schemes based on subspace methods have to be developed. Since, as preliminary work shows, the influence of the antenna characteristics like pattern is much more pronounced in the noncoherent case compared to the coherent one, this influence has to be assessed in detail. On the other hand, the use of low-linearity/low-complexity (roughly quantizing) receiver frontends has to be studied in the context of massive MIMO. The philosophy of Sigma-Delta conversion, i.e., resolution is exchanged by speed, will be carried over to the situation at hand of spatially sampling the field in the channel. The potential of such a spatial Sigma-Delta sampling approach aiming at enabling low-complexity frontends in a still high-performing scheme will be assessed.

具有配备有非常大数量的接收天线的中央基站的多用户通信系统（所谓的大规模MIMO）正获得越来越多的关注。这种系统中的主要挑战是获取准确的信道状态信息以及实现这种系统的努力，例如，将高质量LO信号分配到RF前端。这些问题可以通过应用非相干传输方案来克服，特别是，如果低复杂度的前端可以使用。因此，该建议解决了多用户大规模MIMO上行链路系统的设计和评估。特别是，模拟无线电前端和所采用的联合检测算法之间的相互作用，必须详细研究。新的见解，新的结果，和新的方法，共同对待这些领域。一方面，必须开发基于子空间方法的增强非相干检测方案。由于初步工作表明，天线特性的影响，如模式是更加明显的非相干的情况下相比，相干的，这种影响必须详细评估。另一方面，必须在大规模MIMO的背景下研究低线性度/低复杂度（粗略量化）接收器前端的使用。Sigma-Delta转换的原理，即，分辨率由速度交换，将被带到对通道中的场进行空间采样的当前情况。 这种空间Σ-Δ采样方法的潜力，旨在使低复杂性的前端仍然高性能的计划将进行评估。