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arXiv 1902.07503eess.SP
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具有有限前传容量的无小区毫米波大规模多输入多输出系统

Cell-Free Millimeter-Wave Massive MIMO Systems with Limited Fronthaul Capacity

Guillem Femenias, Felip Riera-Palou

摘要:

网络致密化、大规模多输入多输出(MIMO)和毫米波(mmWave)频带最近已经成为未来几代无线通信网络(5G及更高)的物理层使能器。基于先前在亚6 GHz无小区大规模多输入多输出架构上的工作,引入了用于无小区mmWave大规模多输入多输出系统的新框架,该框架考虑了低复杂度混合预编码器/解码器的使用,同时考虑了使用容量受限前传链路的影响。提出了一种基于相异性聚类思想的次优导频分配策略。此外,基于数学上易于处理的表达式为每个用户可实现的速率和前传容量消耗,最大-最小功率分配和前传量化优化算法,提出了使用块坐标下降方法与顺序线性优化程序相结合,确保均匀良好的服务质量在整个覆盖区域的网络。仿真结果表明,该导频分配策略避免了最优小规模CSI方案的计算负担,同时明显优于经典的随机导频分配方法。此外,它们还揭示了可实现的最大-最小每用户速率、前传要求和最佳硬件复杂度(即,天线的数量、RF链的数量)。

英文摘要:

Network densification, massive multiple-input multiple-output (MIMO) and millimeter-wave (mmWave) bands have recently emerged as some of the physical layer enablers for the future generations of wireless communication networks (5G and beyond). Grounded on prior work on sub-6~GHz cell-free massive MIMO architectures, a novel framework for cell-free mmWave massive MIMO systems is introduced that considers the use of low-complexity hybrid precoders/decoders while factors in the impact of using capacity-constrained fronthaul links. A suboptimal pilot allocation strategy is proposed that is grounded on the idea of clustering by dissimilarity. Furthermore, based on mathematically tractable expressions for the per-user achievable rates and the fronthaul capacity consumption, max-min power allocation and fronthaul quantization optimization algorithms are proposed that, combining the use of block coordinate descent methods with sequential linear optimization programs, ensure a uniformly good quality of service over the whole coverage area of the network. Simulation results show that the proposed pilot allocation strategy eludes the computational burden of the optimal small-scale CSI-based scheme while clearly outperforming the classical random pilot allocation approaches. Moreover, they also reveal the various existing trade-offs among the achievable max-min per-user rate, the fronthaul requirements and the optimal hardware complexity (i.e., number of antennas, number of RF chains).

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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